Physical downlink control channel transmission method and apparatus

Abstract

The application provides a physical downlink control channel transmission method and device, and belongs to the technical field of communication. The physical downlink control channel transmission method is applied to a network side device and comprises the following steps: determining control resource set parameters configured for a terminal, uniformly dividing a control resource set into N sub-bands on a frequency domain and numbering the sub-bands in sequence, wherein N is a positive integer greater than 1; dividing the control resource set into multiple resource particle groups based on three dimensions of a time domain, a frequency domain and a layer, numbering the resource particle groups according to a numbering rule, wherein the numbering rule is used for determining the sequence of numbering each resource particle group in the control resource set; and mapping a control channel unit to a resource particle group according to a mapping rule between the control channel unit and the resource particle group, and transmitting a PDCCH on the corresponding resource particle group. The technical scheme of the application can support more flexible PDCCH resource allocation.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a physical downlink control channel transmission method and apparatus. Background Technology

[0002] In existing communication protocols, when a base station needs to transmit PDCCH (Physical Downlink Control Channel), it first configures a CORESET (control-resource set) for the terminal, occupying 1-3 OFDM (Orthogonal Frequency Division Multiplexing) symbols in the time domain and several PRB (physical resource blocks) in the frequency domain. Then, a two-level resource mapping is used to determine the resource mapping result of PDCCH within the CORESET. First, the CCE (control channel element) index constituting the PDCCH is determined. Then, according to the mapping rules between CCE and REG (Resource Element Group) bundles, the corresponding REG bundle index is determined, further determining the corresponding REG index. Each REG corresponds to a RB (resource block) in the frequency domain. REGs within the CORESET are numbered in order from time domain to frequency domain. A REG bundle corresponds to a group of consecutive REGs.

[0003] like Figure 1 As shown, the mapping process from REG to CCE is as follows: first, REG is divided into REG bundles, then the REG bundles are put into the rectangular interleaver by row, and finally extracted by column to obtain CCE.

[0004] The aggregation level of PDCCH refers to the number of CCEs contained in the PDCCH. When monitoring PDCCH, the terminal needs to attempt to decode the PDCCH candidate under each aggregation level in CORESET. If the decoding is successful, it can further obtain DCI (Downlink Control Information).

[0005] In VLC (Visible Light Communication) systems, there are two main basic waveforms: DCO-OFDM (DC-biased optical orthogonal frequency division multiplexing) and ACO-OFDM (asymmetric clamped optical orthogonal frequency division multiplexing). The former has higher spectral efficiency, but lower energy efficiency due to the DC bias not carrying information; the latter uses only odd-indexed subcarriers to transmit information, resulting in lower spectral efficiency, but higher energy efficiency because there is no DC bias. As for LACO-OFDM (layered ACO-OFDM) waveforms, such as... Figure 2 As shown, the frequency domain resources are divided into multiple layers, making full use of the spare subcarriers in ACO-OFDM, and eliminating the need for DC bias. Therefore, both spectral efficiency and energy efficiency are high. Especially in short-range communication scenarios, the signal transmission performance is close to that of DCO-OFDM, making it one of the candidate waveforms for future VLC.

[0006] In the LACO-OFDM system, there is currently no clear solution on how to map the PDCCH to different layer resources for transmission while ensuring its transmission performance. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a physical downlink control channel transmission method and apparatus that can support more flexible PDCCH resource allocation.

[0008] To address the aforementioned technical problems, embodiments of the present invention provide the following technical solutions:

[0009] On one hand, embodiments of the present invention provide a physical downlink control channel transmission method, applied to a network-side device, the method comprising:

[0010] The control resource set parameters configured for the terminal are determined. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband.

[0011] The control resource set is uniformly divided into N sub-bands in the frequency domain and numbered sequentially, where N is a positive integer greater than 1;

[0012] The control resource set is divided into multiple resource particle groups based on three dimensions: time domain, frequency domain, and layer. The resource particle groups are numbered according to the numbering rules, which are used to determine the order in which the resource particle groups in the control resource set are numbered.

[0013] According to the mapping rules between control channel units and resource particle groups, control channel units are mapped to resource particle groups, and PDCCHs are sent on the corresponding resource particle groups.

[0014] In some embodiments, the numbering rules include:

[0015] The resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0016] For each symbol, the resource particle groups of each layer are numbered sequentially according to the layer order;

[0017] For each layer of resource particle groups, the resource particle groups are numbered according to the frequency domain order.

[0018] In some embodiments, the numbering rules include:

[0019] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0020] For each layer of resource particle groups, the resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0021] For each symbol, the resource particle groups are numbered according to frequency domain order.

[0022] In some embodiments, the numbering rules include:

[0023] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0024] For each layer, the resource particle groups of each sub-band are numbered sequentially according to the frequency domain order;

[0025] For each subband, the resource particle groups of each symbol are numbered sequentially according to the time domain order.

[0026] In some embodiments, the set of control resource parameters determined for the terminal configuration includes:

[0027] The PDCCH transmission type is selected based on the service scenario and / or channel quality. The transmission type includes single-layer transmission and multi-layer transmission.

[0028] In some embodiments, when the transmission type is single-layer transmission, the method further includes:

[0029] Configure an aggregation level for each layer of transport, where the aggregation level of layer k+1 is less than the aggregation level of layer k, and k is a positive integer.

[0030] In some embodiments, the number of resource particle groups in layer i+1 is half the number of resource particle groups in layer i, where i is a positive integer.

[0031] This invention also provides a physical downlink control channel transmission method, applied to a terminal, the method comprising:

[0032] The transmission type, control resource set parameters, and / or layer indication information are obtained. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband.

[0033] Determine the control channel element index;

[0034] The sub-band index is determined based on the control channel unit index, the number of sub-bands contained in the control channel unit, and preset rules;

[0035] The resource particle group index occupied by PDCCH is determined based on the control resource set parameters, the layer index, and the sub-band index.

[0036] In some embodiments, the numbering rules include: numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups sequentially according to the frequency domain order; determining the resource particle group index occupied by the PDCCH includes:

[0037] Calculate the resource particle group index of each symbol inner layer i and sub-band n in sequence, where layer i is the (i+1)th layer and sub-band n is the (n+1)th sub-band;

[0038] For symbol j, the starting index of the resource particle group for symbol j and the starting index of the resource particle group for symbol j and layer i are determined based on the number of OFDM symbols and the number of resource particle groups in each layer.

[0039] Then, based on the subband index and the subband size of layer i, the resource particle group index of the corresponding subband is obtained, thereby obtaining the resource particle group index occupied by PDCCH in each symbol.

[0040] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups sequentially according to the frequency domain order; determining the resource particle group index occupied by the PDCCH includes:

[0041] The starting index of the corresponding resource particle group is determined based on the number of resource particle groups in layer i; the index of the resource particle group occupied by PDCCH is determined based on the subband index and the subband size of layer i.

[0042] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer, numbering the resource particle groups of each sub-band sequentially according to the frequency domain order; for each sub-band, numbering the resource particle groups of each symbol sequentially according to the time domain order; determining the resource particle group index occupied by the PDCCH includes:

[0043] The number of resource particle groups in layer i and the number of sub-bands N are determined based on the number of resource particle groups in layer i and the number of sub-bands N.

[0044] Then, determine the starting index of the resource particle group for each sub-band and layer i based on the total number of resource particle groups in the first i layers;

[0045] Then, determine the resource particle group index occupied by PDCCH based on the sub-band index.

[0046] This invention also provides a physical downlink control channel transmission device, including a processor and a transceiver;

[0047] The processor is used to determine control resource set parameters configured for the terminal. These parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and the number of subbands contained in a control channel unit. The aggregation level is the number of control channel units contained in the Physical Downlink Control Channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband. The control resource set is uniformly divided into N subbands in the frequency domain and numbered sequentially, where N is a positive integer greater than 1. Based on the time domain, frequency domain, and layer dimensions, the control resource set is divided into multiple resource particle groups, and these groups are numbered according to the numbering rules, which determine the order in which the resource particle groups in the control resource set are numbered.

[0048] The transceiver is used to map the control channel unit to the resource particle group according to the mapping rule between the control channel unit and the resource particle group, and send the PDCCH on the corresponding resource particle group.

[0049] This invention also provides a physical downlink control channel transmission device, including a processor and a transceiver;

[0050] The transceiver is used to acquire transmission type, control resource set parameters and / or layer indication information. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH). The subband size indicates the number of resource particle groups contained in the subband.

[0051] The processor is used to determine the control channel unit index; determine the sub-band index based on the control channel unit index, the number of sub-bands contained in the control channel unit, and preset rules; and determine the resource particle group index occupied by the PDCCH based on the control resource set parameters, the layer index, and the sub-band index.

[0052] This invention also provides a physical downlink control channel transmission apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor; when the processor executes the program, it implements the physical downlink control channel transmission method as described above.

[0053] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps in the physical downlink control channel transmission method described above.

[0054] The embodiments of the present invention have the following beneficial effects:

[0055] In the above scheme, resource particle groups can be divided on different layers, subbands, and symbols, realizing PDCCH transmission in the LACO-OFDM system and supporting more flexible PDCCH resource allocation. The technical solution of this embodiment is conducive to using different aggregation levels at different layers to adapt to different service scenarios. For example, for users at the cell edge, a lower layer and a higher aggregation level can be used to ensure PDCCH coverage; for users at the cell center, a higher layer and a lower aggregation level can be used to allocate more resources to other users. Attached Figure Description

[0056] Figure 1 This is a diagram illustrating the mapping rules between REG bundles and CCEs;

[0057] Figure 2 A schematic diagram showing that frequency domain resources are divided into multiple layers;

[0058] Figure 3 This is a flowchart illustrating the physical downlink control channel transmission method for network-side devices according to an embodiment of the present invention.

[0059] Figures 4-6This is a schematic diagram illustrating the numbering rules of an embodiment of the present invention;

[0060] Figure 7 This is a flowchart illustrating the terminal-side physical downlink control channel transmission method according to an embodiment of the present invention.

[0061] Figure 8 and Figure 9 This is a schematic diagram of the physical downlink control channel transmission device according to an embodiment of the present invention. Detailed Implementation

[0062] To make the technical problems, technical solutions and advantages of the embodiments of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0063] Embodiments of the present invention provide a physical downlink control channel transmission method and apparatus that can support more flexible PDCCH resource allocation.

[0064] Embodiments of the present invention provide a physical downlink control channel transmission method, applied to network-side devices, such as... Figure 3 As shown, the method includes:

[0065] Step 101: Determine the control resource set parameters configured for the terminal. The control resource set parameters include: number of layers, number of resource particles (REG) per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particles contained in the subband.

[0066] Step 102: Divide the control resource set into N sub-bands in the frequency domain and number them sequentially, where N is a positive integer greater than 1;

[0067] Step 103: Divide the control resource set into multiple resource particle groups based on the three dimensions of time domain, frequency domain, and layer, and number the resource particle groups according to the numbering rules. The numbering rules are used to determine the order in which the resource particle groups in the control resource set are numbered.

[0068] Step 104: Map the control channel unit to the resource particle group according to the mapping rule between the control channel unit and the resource particle group, and send the PDCCH on the corresponding resource particle group.

[0069] In this embodiment, resource particle groups can be divided across different layers, subbands, and symbols, enabling PDCCH transmission in the LACO-OFDM system and supporting more flexible PDCCH resource allocation. The technical solution in this embodiment facilitates the use of different aggregation levels at different layers to adapt to different service scenarios. For example, for users at the cell edge, a lower layer and a higher aggregation level can be used to ensure PDCCH coverage; for users at the cell center, a higher layer and a lower aggregation level can be used to allocate more resources to other users.

[0070] In some embodiments, the set of control resource parameters determined for the terminal configuration includes:

[0071] The PDCCH transmission type is selected based on the service scenario and / or channel quality. The transmission type includes single-layer transmission and multi-layer transmission.

[0072] The aforementioned aggregation level set may contain one or more elements. If there is only one element, it corresponds to multi-layer transmission, meaning one aggregation level indicates transmission for multiple layers. If it contains multiple elements, they correspond to transmission for different layers, meaning multiple aggregation levels in the aggregation level set correspond one-to-one with transmission for multiple layers, with each aggregation level indicating the transmission for its corresponding layer. If the transmission type is configured as single-layer transmission, layer indication information should also be sent, indicating the layer index used by the PDCCH.

[0073] When configuring an aggregation level for each layer of transmission, the aggregation level of higher layers is smaller and is suitable for single-layer transmission. That is, the aggregation level of layer k+1 is smaller than the aggregation level of layer k, where k is a positive integer.

[0074] In some embodiments, the number of resource particle groups in each layer is halved layer by layer, that is, the number of resource particle groups in layer i+1 is half the number of resource particle groups in layer i, where i is a positive integer.

[0075] In this embodiment, the resource particle group has the following characteristics:

[0076] (1) A resource particle group contains M available REs (M>=1), where M is a predefined value. The index of the available REs is related to the layer index. For example, for the first resource particle group of layer 0, the RE index it contains is {1,3,5,…,1+2(M-1)}.

[0077] (2) The number of resource particle groups in inner layer i is A / (2^i), where i is the layer index, i is the number of resource particle groups that decreases by half with each layer, and A is the number of REGs in the layer corresponding to the smallest layer index within the symbol. The subband size of layer i is B = A / (2^i*N) resource particle groups.

[0078] In some embodiments, numbering rule 1 includes:

[0079] The resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0080] For each symbol, the resource particle groups of each layer are numbered sequentially according to the layer order;

[0081] For each layer of resource particle groups, the resource particle groups are numbered according to the frequency domain order.

[0082] In this embodiment, the numbering rule follows a time-domain order, sequentially numbering each layer of resource particle groups on each symbol. The starting number of the resource particle group on layer i+1 is determined based on the last number of the resource particle group on layer i; the starting number of the resource particle group on symbol j+1 is determined based on the last number of the resource particle group on symbol j. In a specific example, such as... Figure 4 As shown, following the time-domain order, the resource particle group of symbol 0 is numbered first, and then the resource particle group of symbol 1 is numbered. In symbol 0, following the layer index order, the resource particle group of layer 0 is numbered first, and then the resource particle group of layer 1 is numbered. In layer 0, following the frequency-domain order, the resource particle groups are numbered sequentially to obtain resource particle group 0, resource particle group 1, resource particle group 2, and resource particle group 3. In layer 1, following the frequency-domain order, the resource particle groups are numbered sequentially to obtain resource particle group 4 and resource particle group 5. In symbol 1, following the layer index order, the resource particle groups of layer 0 are numbered first, and then the resource particle groups of layer 1 are numbered. In layer 0, following the frequency-domain order, the resource particle groups are numbered sequentially to obtain resource particle group 6, resource particle group 7, resource particle group 8, and resource particle group 9. In layer 1, following the frequency-domain order, the resource particle groups are numbered sequentially to obtain resource particle group 10 and resource particle group 11.

[0083] In some embodiments, numbering rule 2 includes:

[0084] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0085] For each layer of resource particle groups, the resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0086] For each symbol, the resource particle groups are numbered according to frequency domain order.

[0087] In this embodiment, resource particle groups on different symbols corresponding to each layer are numbered sequentially according to the layer order. The starting number of the resource particle group on symbol j+1 and layer i is determined based on the last number of the resource particle group on symbol j and layer i; the starting number of the resource particle group on symbol 0 and layer i+1 is determined by the last number of the resource particle group on symbol J-1 and layer i. Here, J is the time-domain length of the downlink control channel region (i.e., the number of OFDM symbols). In a specific example, such as... Figure 5 As shown, following the layer index order, the resource particle groups of layer 0 are numbered first, then the resource particle groups of layer 1 are numbered. In layer 0, following the time domain order, the resource particle groups of symbol 0 are numbered first, then the resource particle groups of symbol 1 are numbered. In symbol 0, following the frequency domain order, the resource particle groups are numbered sequentially to obtain resource particle group 0, resource particle group 1, resource particle group 2, and resource particle group 3. In symbol 1, following the frequency domain order, the resource particle groups are numbered sequentially to obtain resource particle group 4, resource particle group 5, resource particle group 6, and resource particle group 7. In layer 1, following the time domain order, the resource particle groups of symbol 0 are numbered first, then the resource particle groups of symbol 1 are numbered. In symbol 0, following the frequency domain order, the resource particle groups are numbered sequentially to obtain resource particle group 8 and resource particle group 9. In symbol 1, following the frequency domain order, the resource particle groups are numbered sequentially to obtain resource particle group 10 and resource particle group 11.

[0088] In some embodiments, numbering rule 3 includes:

[0089] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0090] For each layer, the resource particle groups of each sub-band are numbered sequentially according to the frequency domain order;

[0091] For each subband, the resource particle groups of each symbol are numbered sequentially according to the time domain order.

[0092] In this embodiment, resource particle groups on different symbols corresponding to each sub-band are numbered sequentially according to the layer order. The starting number of the resource particle group on sub-band n+1 and layer i is determined based on the last number of the resource particle group on sub-band n and layer i; the starting number of the resource particle group on symbol j and layer i+1 is determined by the last number of the resource particle group on symbol j+1 and layer i. In a specific example, such as... Figure 6As shown, following the order of the layer index, the resource particle groups of layer 0 are numbered first, and then the resource particle groups of layer 1 are numbered. In layer 0, following the frequency domain order, the resource particle groups of sub-band 0 are numbered first, and then the resource particle groups of sub-band 1 are numbered. In sub-band 0, following the time domain order, the resource particle groups of symbol 0 are numbered first, and then the resource particle groups of symbol 1 are numbered, resulting in resource particle groups 0, 1, 2, and 3. In sub-band 1, following the time domain order, the resource particle groups of symbol 0 are numbered first, and then the resource particle groups of symbol 1 are numbered, resulting in resource particle groups 4, 5, 6, and 7. In layer 1, the resource particle groups of subband 0 are numbered first according to the frequency domain order, and then the resource particle groups of subband 1 are numbered. In subband 0, the resource particle groups of symbol 0 are numbered first according to the time domain order, and then the resource particle groups of symbol 1 are numbered, resulting in resource particle groups 8 and 9. In subband 1, the resource particle groups of symbol 0 are numbered first according to the time domain order, and then the resource particle groups of symbol 1 are numbered, resulting in resource particle groups 10 and 11.

[0093] This invention also provides a physical downlink control channel transmission method, applied to a terminal, such as... Figure 7 As shown, the method includes:

[0094] Step 201: Obtain transmission type, control resource set parameters and / or layer indication information. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel element (CCE). The aggregation level is the number of control channel elements contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband.

[0095] Step 202: Determine the control channel element index;

[0096] Step 203: Determine the sub-band index based on the control channel unit index, the number of sub-bands contained in the control channel unit, and preset rules;

[0097] Step 204: Determine the resource particle group index occupied by PDCCH based on the control resource set parameters, layer index, and sub-band index.

[0098] In this embodiment, the terminal can obtain the layer index i and aggregation level of the PDCCH, the number of subbands N1 contained in the control channel unit, and then determine the control channel unit index and corresponding subband index occupied by the PDCCH, as well as the subband size B of layer i. The aggregation level can be independently configured for each layer according to the transmission performance of different layers, with higher aggregation level sets configured for lower layers and lower aggregation level sets configured for higher layers, to flexibly support different service scenarios.

[0099] The preset rule represents the mapping relationship between the control channel unit index and the sub-band index, which can be an interleaved mapping or a centralized mapping.

[0100] In some embodiments, the numbering rules include: numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups sequentially according to the frequency domain order; determining the resource particle group index occupied by the PDCCH includes:

[0101] Calculate the resource particle group index of each symbol inner layer i and sub-band n in sequence, where layer i is the (i+1)th layer and sub-band n is the (n+1)th sub-band;

[0102] For symbol j, the starting index of the resource particle group for symbol j and the starting index of the resource particle group for symbol j and layer i are determined based on the number of OFDM symbols and the number of resource particle groups in each layer.

[0103] Then, based on the subband index and the subband size of layer i, the resource particle group index of the corresponding subband is obtained, thereby obtaining the resource particle group index occupied by PDCCH in each symbol.

[0104] Specifically, for symbol j, the starting index of the resource particle group for symbol j and the starting index of the resource particle group for symbol j and layer i are determined based on the number of OFDM symbols and the number of resource particle groups in each layer. Then, the resource particle group index of the corresponding subband is obtained based on the subband index and the subband size of layer i, thus obtaining the resource particle group index occupied by the PDCCH in each symbol. If the transmission type is single-layer transmission, the value of i is determined according to the layer indication information; if the transmission type is multi-layer transmission, the value of i is 0, 1, ..., layer number - 1. Here, symbol j is the (j+1)th symbol.

[0105] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups sequentially according to the frequency domain order; determining the resource particle group index occupied by the PDCCH includes:

[0106] The starting index of the corresponding resource particle group is determined based on the number of resource particle groups in layer i; the index of the resource particle group occupied by PDCCH is determined based on the subband index and the subband size of layer i.

[0107] Specifically, the starting index of the corresponding resource particle group is determined based on the number of resource particle groups in layer i; thus, the resource particle group index occupied by the PDCCH is determined based on the subband index and the subband size of layer i. If the transmission type is single-layer transmission, the value of i is determined according to the layer indication information; if the transmission type is multi-layer transmission, the value of i is 0, 1, ..., layer number - 1. Here, layer i is the (i+1)th layer, subband n is the (n+1)th subband, and symbol j is the (j+1)th symbol.

[0108] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer, numbering the resource particle groups of each sub-band sequentially according to the frequency domain order; for each sub-band, numbering the resource particle groups of each symbol sequentially according to the time domain order; determining the resource particle group index occupied by the PDCCH includes:

[0109] The number of resource particle groups in layer i and the number of sub-bands N are determined based on the number of resource particle groups in layer i and the number of sub-bands N.

[0110] Then, determine the starting index of the resource particle group for each sub-band and layer i based on the total number of resource particle groups in the first i layers;

[0111] Then, determine the resource particle group index occupied by PDCCH based on the sub-band index.

[0112] Specifically, the number of resource particle groups in layer i and the number of subbands N are determined based on the number of resource particle groups in layer i and the number of subbands N. Then, the starting index of the resource particle groups in each subband and layer i is determined based on the total number of resource particle groups in the first i layers. Finally, the index of the resource particle group occupied by the PDCCH is determined based on the subband index. If the transmission type is single-layer transmission, the value of i is determined based on the layer indication information; if the transmission type is multi-layer transmission, the value of i is 0, 1, ..., layer number - 1, where layer i is the (i+1)th layer and subband n is the (n+1)th subband.

[0113] In one specific embodiment, for a two-layer LACO-OFDM system, a predefined set of aggregation levels for each layer is defined: the aggregation level set for layer 0 is {8, 16}, and the aggregation level set for layer 1 is {1, 4}. The mapping from control channel elements to subbands is a localized mapping, meaning that one control channel element contains N1 consecutive subbands. Resource particle groups within the downlink control channel area are numbered according to numbering rule 1, with a time-domain length of 2 OFDM symbols.

[0114] In a specific example, the terminal is a cell edge user. To ensure coverage performance, the network configures the terminal's PDCCH with Layer 0 and aggregation level 8. The terminal attempts to decode all PDCCH candidates. Assume that the control channel element index of PDCCH candidate 0 is 0–7, and the corresponding subband index is 0–8*N1*B-1. For symbol 0, the starting index of its Layer 0 resource particle group is 0. Since the subbands contained in the control channel element are continuous, the resource particle group indices in the N1 subbands can be directly determined to be 0–8*N1*B-1. For symbol 1, the total number of resource particle groups in the previous symbol is R / 2. Therefore, the starting index of the Layer 0 resource particle group for symbol 1 is R / 2, and the resource particle group indices in the N1 subbands are R / 2–R / 2+8*N1*B-1. Thus, the resource particle group indices occupied by PDCCH candidate 0 are determined to be 0–8*N1-1, R / 2–R / 2+8*N1*B-1. The resource particle group indexes of other PDCCH candidates can be determined using the same method.

[0115] In another specific example, the terminal is a user in the cell center. To improve spectrum efficiency, the network configures the terminal's PDCCH with Layer 1 and Aggregation Level 1, allocating more resources to other users. The terminal attempts to decode all PDCCH candidates. Assume that the control channel element index of PDCCH candidate 0 is 0, and the corresponding subband index is 0. For symbol 0, the total number of resource particle groups in Layer 0 is A, then the starting index of the resource particle group in Layer 1 is A, and the resource particle group index of subband 0 is A to A+B-1. For symbol 1, the total number of resource particle groups in the previous symbol is A*(1+1 / 2)=(3 / 2)*A, and the total number of resource particle groups in the previous layer within the symbol is A. Therefore, the starting index of the resource particle group in Layer 1 is (3 / 2)*A+A=(5 / 2)*A, and the resource particle group index of subband 0 is (5 / 2)*A to (5 / 2)*A+B-1. Therefore, the resource particle group index occupied by PDCCH candidate0 is determined to be A~A+B-1, (5 / 2)*A~(5 / 2)*A+B-1. The resource particle group indexes of other PDCCH candidates can be determined using the same method.

[0116] In this embodiment, resource particle groups can be divided and numbered based on three dimensions: time domain, frequency domain, and layer. For single-layer PDCCH transmission, an aggregation level can be independently configured for each layer according to the transmission performance of different layers, and the control channel unit contains a resource particle group for a certain layer. The base station selects a layer of resource PDCCH for the terminal to transmit PDCCH according to the service scenario. For multi-layer PDCCH transmission, the aggregation level does not distinguish between layers, the control channel unit contains multi-layer resource particle groups, and the base station uses multi-layer resource PDCCH for transmission.

[0117] This invention also provides a physical downlink control channel transmission device, such as... Figure 8 As shown, it includes a processor 22 and a transceiver 21;

[0118] The processor 22 is used to determine control resource set parameters configured for the terminal. These parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and the number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the Physical Downlink Control Channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband. The control resource set is uniformly divided into N subbands in the frequency domain and numbered sequentially, where N is a positive integer greater than 1. Based on the time domain, frequency domain, and layer dimensions, the control resource set is divided into multiple resource particle groups, and the resource particle groups are numbered according to the numbering rules, which determine the order in which the resource particle groups in the control resource set are numbered.

[0119] The transceiver 21 is used to map the control channel unit to the resource particle group according to the mapping rule between the control channel unit and the resource particle group, and send the PDCCH on the corresponding resource particle group.

[0120] In some embodiments, the numbering rules include:

[0121] The resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0122] For each symbol, the resource particle groups of each layer are numbered sequentially according to the layer order;

[0123] For each layer of resource particle groups, the resource particle groups are numbered according to the frequency domain order.

[0124] In some embodiments, the numbering rules include:

[0125] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0126] For each layer of resource particle groups, the resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0127] For each symbol, the resource particle groups are numbered according to frequency domain order.

[0128] In some embodiments, the numbering rules include:

[0129] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0130] For each layer, the resource particle groups of each sub-band are numbered sequentially according to the frequency domain order;

[0131] For each subband, the resource particle groups of each symbol are numbered sequentially according to the time domain order.

[0132] In some embodiments, the processor is configured to select the PDCCH transmission type based on the service scenario and / or channel quality, the transmission type including single-layer transmission and multi-layer transmission.

[0133] In some embodiments, when the transmission type is a single-layer transmission, the processor is further configured to configure an aggregation level for each layer of transmission, wherein the aggregation level of layer k+1 is less than the aggregation level of layer k, and k is a positive integer.

[0134] In some embodiments, the number of resource particle groups in layer i+1 is half the number of resource particle groups in layer i, where i is a positive integer.

[0135] This invention also provides a physical downlink control channel transmission device, such as... Figure 8 As shown, it includes a processor 22 and a transceiver 21;

[0136] The transceiver 21 is used to acquire transmission type, control resource set parameters and / or layer indication information. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband.

[0137] The processor 22 is used to determine the control channel unit index; determine the sub-band index according to the control channel unit index, the number of sub-bands contained in the control channel unit and preset rules; and determine the resource particle group index occupied by the PDCCH according to the control resource set parameters, the layer index and the sub-band index.

[0138] In some embodiments, the numbering rules include: numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle groups, numbering the resource particle groups sequentially according to the frequency domain order; the processor is used to sequentially calculate the resource particle group indices of layer i and subband n within each symbol, where layer i is the (i+1)th layer and subband n is the (n+1)th subband; for symbol j, the starting index of the resource particle group of symbol j and the starting index of the resource particle group of symbol j and layer i are determined according to the number of OFDM symbols and the number of resource particle groups in each layer; then, the resource particle group index of the corresponding subband is obtained according to the subband index and the subband size of layer i, thereby obtaining the resource particle group index occupied by PDCCH within each symbol.

[0139] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups sequentially according to the frequency domain order; the processor is used to determine the corresponding resource particle group starting index according to the number of resource particle groups in layer i; and to determine the resource particle group index occupied by the PDCCH according to the subband index and the subband size of layer i.

[0140] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer, numbering the resource particle groups of each sub-band sequentially according to the frequency domain order; for each sub-band, numbering the resource particle groups of each symbol sequentially according to the time domain order; the processor is used to determine the number of resource particle groups of layer i and each sub-band based on the number of resource particle groups of layer i and the number of sub-bands N; then determine the starting index of the resource particle groups of each sub-band and layer i based on the total number of resource particle groups of the first i layers; and then determine the index of the resource particle group occupied by PDCCH based on the sub-band index.

[0141] This invention also provides a physical downlink control channel transmission device, such as... Figure 9 As shown, it includes a memory 31, a processor 32, and a computer program stored in the memory 31 and executable on the processor 32; when the processor 32 executes the program, it implements the physical downlink control channel transmission method as described above.

[0142] In some embodiments, the processor 32 is configured to determine control resource set parameters for the terminal, the control resource set parameters including: number of layers, number of resource particle groups per layer, subband size per layer, number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, bandwidth, numbering rule, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband. The control resource set is uniformly divided into N subbands in the frequency domain and numbered sequentially, where N is a positive integer greater than 1. The control resource set is divided into multiple resource particle groups based on three dimensions: time domain, frequency domain, and layer. The resource particle groups are numbered according to the numbering rule, which is used to determine the order in which the resource particle groups in the control resource set are numbered. The control channel units are mapped to resource particle groups according to the mapping rule between control channel units and resource particle groups, and PDCCH is transmitted on the corresponding resource particle groups.

[0143] In some embodiments, the numbering rules include:

[0144] The resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0145] For each symbol, the resource particle groups of each layer are numbered sequentially according to the layer order;

[0146] For each layer of resource particle groups, the resource particle groups are numbered according to the frequency domain order.

[0147] In some embodiments, the numbering rules include:

[0148] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0149] For each layer of resource particle groups, the resource particle groups of each symbol are numbered sequentially according to the time domain order;

[0150] For each symbol, the resource particle groups are numbered according to frequency domain order.

[0151] In some embodiments, the numbering rules include:

[0152] The resource particle groups of each layer are numbered sequentially according to the layer order;

[0153] For each layer, the resource particle groups of each sub-band are numbered sequentially according to the frequency domain order;

[0154] For each subband, the resource particle groups of each symbol are numbered sequentially according to the time domain order.

[0155] In some embodiments, the processor is configured to select the PDCCH transmission type based on the service scenario and / or channel quality, the transmission type including single-layer transmission and multi-layer transmission.

[0156] In some embodiments, when the transmission type is a single-layer transmission, the processor is further configured to configure an aggregation level for each layer of transmission, wherein the aggregation level of layer k+1 is less than the aggregation level of layer k, and k is a positive integer.

[0157] In some embodiments, the number of resource particle groups in layer i+1 is half the number of resource particle groups in layer i, where i is a positive integer.

[0158] In some embodiments, the processor 32 is configured to acquire transmission type, control resource set parameters, and / or layer indication information. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in a control channel unit. The aggregation level is the number of control channel units contained in the Physical Downlink Control Channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband. The processor 32 determines the control channel unit index; determines the subband index based on the control channel unit index, the number of subbands contained in the control channel unit, and a preset rule; and determines the resource particle group index occupied by the PDCCH based on the control resource set parameters, the layer index, and the subband index.

[0159] In some embodiments, the numbering rules include: numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle groups, numbering the resource particle groups sequentially according to the frequency domain order; the processor 32 is used to sequentially calculate the resource particle group index of layer i and subband n within each symbol, where layer i is the (i+1)th layer and subband n is the (n+1)th subband; for symbol j, the starting index of the resource particle group of symbol j and the starting index of the resource particle group of symbol j and layer i are determined according to the number of OFDM symbols and the number of resource particle groups in each layer; then, the resource particle group index of the corresponding subband is obtained according to the subband index and the subband size of layer i, thereby obtaining the resource particle group index occupied by PDCCH within each symbol.

[0160] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups sequentially according to the frequency domain order; the processor 32 is used to determine the corresponding resource particle group starting index according to the number of resource particle groups in layer i; and to determine the resource particle group index occupied by the PDCCH according to the subband index and the subband size of layer i.

[0161] In some embodiments, the numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer, numbering the resource particle groups of each sub-band sequentially according to the frequency domain order; for each sub-band, numbering the resource particle groups of each symbol sequentially according to the time domain order; the processor 32 is used to determine the number of resource particle groups of layer i and each sub-band according to the number of resource particle groups of layer i and the number of sub-bands N; then determine the starting index of the resource particle groups of each sub-band and layer i according to the total number of resource particle groups of the first i layers; and then determine the index of the resource particle groups occupied by PDCCH according to the sub-band index.

[0162] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps in the physical downlink control channel transmission method described above.

[0163] Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can store information using any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage, or any other non-transferable medium that can be used to store information accessible to the computer-readable terminal device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0164] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for transmitting a physical downlink control channel, characterized in that, Applied to network-side devices, the method includes: The control resource set parameters configured for the terminal are determined. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband. The control resource set is uniformly divided into N sub-bands in the frequency domain and numbered sequentially, where N is a positive integer greater than 1; The control resource set is divided into multiple resource particle groups based on three dimensions: time domain, frequency domain, and layer. The resource particle groups are numbered according to the numbering rules, which are used to determine the order in which the resource particle groups in the control resource set are numbered. According to the mapping rules between control channel units and resource particle groups, control channel units are mapped to resource particle groups, and PDCCHs are sent on the corresponding resource particle groups.

2. The method of claim 1, wherein, The numbering rules include: The resource particle groups of each symbol are numbered sequentially according to the time domain order; For each symbol, the resource particle groups of each layer are numbered sequentially according to the layer order; For each layer of resource particle groups, the resource particle groups are numbered according to the frequency domain order.

3. The method of claim 1, wherein, The numbering rules include: The resource particle groups of each layer are numbered sequentially according to the layer order; For each layer of resource particle groups, the resource particle groups of each symbol are numbered sequentially according to the time domain order; For each symbol, the resource particle groups are numbered according to the frequency domain order.

4. The method according to claim 1, characterized in that, The numbering rules include: The resource particle groups of each layer are numbered sequentially according to the layer order; For each layer, the resource particle groups of each sub-band are numbered sequentially according to the frequency domain order; For each subband, the resource particle groups of each symbol are numbered sequentially according to the time domain order.

5. The method according to claim 1, characterized in that, The set of control resource parameters determined for the terminal configuration includes: The PDCCH transmission type is selected based on the service scenario and / or channel quality. The transmission type includes single-layer transmission and multi-layer transmission.

6. The method according to claim 5, characterized in that, When the transmission type is single-layer transmission, the method further includes: Configure an aggregation level for each layer of transport, where the aggregation level of layer k+1 is less than the aggregation level of layer k.

7. The method according to claim 1, characterized in that, The number of resource particle groups in layer i+1 is half the number of resource particle groups in layer i, where i is a positive integer.

8. A method for transmitting a physical downlink control channel, characterized in that, Applied to a terminal, the method includes: The transmission type, control resource set parameters, and / or layer indication information are obtained. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband. Determine the control channel element index; The sub-band index is determined based on the control channel unit index, the number of sub-bands contained in the control channel unit, and preset rules; The resource particle group index occupied by PDCCH is determined based on the control resource set parameters, the layer index, and the sub-band index.

9. The method according to claim 8, characterized in that, The numbering rules include: numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups sequentially according to the frequency domain order; determining the resource particle group index occupied by the PDCCH includes: Calculate the resource particle group index of each symbol inner layer i and sub-band n in sequence, where layer i is the (i+1)th layer and sub-band n is the (n+1)th sub-band; For symbol j, the starting index of the resource particle group for symbol j and the starting index of the resource particle group for symbol j and layer i are determined based on the number of OFDM symbols and the number of resource particle groups in each layer. Then, based on the subband index and the subband size of layer i, the resource particle group index of the corresponding subband is obtained, thereby obtaining the resource particle group index occupied by PDCCH in each symbol.

10. The method according to claim 8, characterized in that, The numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer's resource particle group, numbering the resource particle groups of each symbol sequentially according to the time domain order; for each symbol, numbering the resource particle groups sequentially according to the frequency domain order; determining the resource particle group index occupied by the PDCCH includes: The starting index of the corresponding resource particle group is determined based on the number of resource particle groups in layer i; the index of the resource particle group occupied by PDCCH is determined based on the subband index and the subband size of layer i.

11. The method according to claim 8, characterized in that, The numbering rules include: numbering the resource particle groups of each layer sequentially according to the layer order; for each layer, numbering the resource particle groups of each sub-band sequentially according to the frequency domain order; for each sub-band, numbering the resource particle groups of each symbol sequentially according to the time domain order; determining the resource particle group index occupied by the PDCCH includes: The number of resource particle groups in layer i and the number of sub-bands N are determined based on the number of resource particle groups in layer i and the number of sub-bands N. Then, determine the starting index of the resource particle group for each sub-band and layer i based on the total number of resource particle groups in the first i layers; Then, determine the resource particle group index occupied by PDCCH based on the sub-band index.

12. A physical downlink control channel transmission device, characterized in that, Includes processor and transceiver; The processor is used to determine control resource set parameters configured for the terminal. These parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and the number of subbands contained in a control channel unit. The aggregation level is the number of control channel units contained in the Physical Downlink Control Channel (PDCCH), and the subband size indicates the number of resource particle groups contained in the subband. The control resource set is uniformly divided into N subbands in the frequency domain and numbered sequentially, where N is a positive integer greater than 1. Based on the time domain, frequency domain, and layer dimensions, the control resource set is divided into multiple resource particle groups, and these groups are numbered according to the numbering rules, which determine the order in which the resource particle groups in the control resource set are numbered. The transceiver is used to map the control channel unit to the resource particle group according to the mapping rule between the control channel unit and the resource particle group, and then send the physical downlink control channel (PDCCH) on the corresponding resource particle group.

13. A physical downlink control channel transmission device, characterized in that, Includes processor and transceiver; The transceiver is used to acquire transmission type, control resource set parameters and / or layer indication information. The control resource set parameters include: number of layers, number of resource particle groups per layer, subband size per layer, number of orthogonal frequency division multiplexing (OFDM) symbols, bandwidth, numbering rules, aggregation level set, and number of subbands contained in the control channel unit. The aggregation level is the number of control channel units contained in the physical downlink control channel (PDCCH). The subband size indicates the number of resource particle groups contained in the subband. The processor is used to determine the control channel unit index; determine the sub-band index based on the control channel unit index, the number of sub-bands contained in the control channel unit, and preset rules; and determine the resource particle group index occupied by the PDCCH based on the control resource set parameters, the layer index, and the sub-band index.

14. A physical downlink control channel transmission apparatus, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor; characterized in that, When the processor executes the program, it implements the physical downlink control channel transmission method as described in any one of claims 1-11.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the physical downlink control channel transmission method as described in any one of claims 1-11.

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