CN110324134B - Method and device for configuring search space of downlink control channel - Google Patents
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- H—ELECTRICITY
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- H04L5/00—Arrangements affording multiple use of the transmission path
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
- H04L5/0025—Spatial division following the spatial signature of the channel
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
- H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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Abstract
The application provides a downlink control channel configuration method, which is applied to a 5G system, and when the 5G system works in a high frequency band, a downlink control signaling is sent on the 1 st OFDM symbol of a subframe for each user in a mode of analog wave speed forming; when the 5G system works in a low-frequency band, a digital beam forming mode is configured and used for sending downlink control signaling on the first or the first two OFDM symbols of a subframe for each user, and when the size of the frequency domain of the symbols for sending the downlink control signaling is configured, the configured frequency domain supports the size of the frequency domain under the combination of the maximum downlink control information load and the maximum aggregation level and supports the minimum UE bandwidth; configuring a REG for sending a downlink control signaling to be composed of one PRB in a frequency domain and one OFDM symbol in a time domain; each CCE consists of 6 REGs. The technical scheme can meet the requirement of the transmission of the downlink control channel of the 5G system.
Description
The application is a division of an invention patent application with the application number of '201710760510.2' and the name of the invention is 'a downlink control channel configuration method'.
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for configuring a search space of a downlink control channel.
Background
The LTE downlink control channel is used to carry transmission of downlink control signaling, and the carried physical layer control information includes HARQ response information for uplink data transmission, scheduling information for downlink data transmission, uplink power control command information, and the like.
The downlink control channel is mainly divided into: a Physical Control Format Indicator Channel (PCFICH), which is mainly used for transmitting a Control Format Indicator; a Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) used to transmit the HARQ Indicator; a Physical Downlink Control Channel (PDCCH) is mainly used for transmitting Downlink Control information.
The subcarrier interval of the LTE system is fixed at 15kHz, the frame length is 1ms, and with the introduction of a high frequency band and a large bandwidth, the 5G NR supports various subcarrier intervals, and the corresponding frame structure also changes, and besides a common subframe, also supports a mini slot subframe structure, so that the structure of the existing downlink control channel for realizing configuration cannot adapt to the application of the 5G NR technology.
Disclosure of Invention
In view of this, the present application provides a method for configuring a downlink control channel, which can meet the requirement of downlink control channel transmission in a 5G system.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a downlink control channel configuration method is applied to a 5G system, and comprises the following steps:
when the 5G system works in a high-frequency band, a mode of analog wave velocity forming is configured and used for sending downlink control signaling on the 1 st OFDM symbol of a subframe for each user; when the 5G system works in a low-frequency band, a digital beam forming mode is configured to be used for sending downlink control signaling on the first OFDM symbol or the first two OFDM symbols of a subframe for each user, wherein the downlink control signaling is sent on a plurality of PRBs (physical resource blocks) in a frequency domain when being sent on the first two OFDM symbols of the subframe;
when the size of the frequency domain of the symbol for sending the downlink control signaling is configured, the following conditions are met: the configured frequency domain supports the size of the frequency domain under the combination of the maximum downlink control information load and the maximum aggregation level, and supports the minimum UE bandwidth;
configuring a REG for sending a downlink control signaling to be composed of one PRB in a frequency domain and one OFDM symbol in a time domain; each CCE consists of 6 REGs; wherein, when REGs are mapped to CCEs in an interleaved manner, 6 REGs in one CCE are contiguous; when REGs are mapped to a CCE in a non-interleaved manner, 6 REGs in one CCE are divided into 3 REG groups, each REG group consisting of 2 REGs.
As can be seen from the above technical solutions, the symbol length for sending the downlink control signaling, the size of the frequency domain, the composition of REGs and CCEs, and the mapping manner are configured in the present application, so that the requirement of downlink control channel transmission of the 5G system can be met.
Drawings
Fig. 1 is a schematic diagram illustrating a downlink control channel configuration flow in an embodiment of the present application;
fig. 2 is a schematic distribution diagram of CCEs and REGs when 1 OFDM symbol is mapped in a non-interleaved manner in the embodiment of the present application;
fig. 3 is a schematic distribution diagram of CCEs and REGs when 1 OFDM symbol is mapped in an interleaving manner in the embodiment of the present application;
fig. 4 is a schematic distribution diagram of CCEs and REGs when 2 OFDM symbols are mapped in a non-interleaved manner in the embodiment of the present application;
fig. 5 is a schematic distribution diagram of CCEs and REGs when 2 OFDM symbols are mapped in an interleaving manner in the embodiment of the present application;
fig. 6 is a schematic diagram of different aggregation levels in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the present application provides a downlink Control Channel configuration method, which is applied to a 5G system, and is configured for a length of an Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmitting a downlink Control signaling, a size of a frequency domain, a composition of a Resource Element Group (REG) and a Control Channel Element (CCE), and a mapping manner, so that a requirement of downlink Control Channel transmission of the 5G system can be met.
The following describes in detail a configuration process of a downlink control channel in an embodiment of the present application with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of a configuration flow of a downlink control channel in an embodiment of the present application. The method comprises the following specific steps:
When the downlink control signaling is sent on the first two OFDM symbols of the subframe, the downlink control signaling is sent on a plurality of PRBs in the frequency domain, that is, on a plurality of PRBs across the frequency domain of the OFDM symbols, so that the gain is large when the downlink control signaling is sent on the downlink control channel by using digital beamforming.
102, when the base station configures the size of the frequency domain of the symbol for sending the downlink control signaling, the following conditions are satisfied: the configured frequency domain supports the size of the frequency domain under the combination of the maximum downlink control information load and the maximum aggregation level, and supports the minimum UE bandwidth.
In this step, a condition that is satisfied when a frequency domain of a symbol for transmitting a downlink control signaling is configured is given, and in practical application, when the condition is satisfied, the size of the frequency domain may be configurable, for example, the size may be configured to be between 5MHz and 20 MHz.
103, configuring, by the base station, a REG for sending the downlink control signaling to be composed of one PRB in the frequency domain and one OFDM symbol in the time domain; each CCE consists of 6 REGs; wherein, when REGs are mapped to CCEs in an interleaved manner, 6 REGs in one CCE are contiguous; when REGs are mapped to a CCE in a non-interleaved manner, one CCE is divided into 3 REG groups each consisting of 2 REGs.
When REGs are mapped to a CCE in an interleaved manner in this step, one CCE is divided into 3 REG groups, each REG group consisting of 2 REGs. This partitioning can provide higher frequency diversity, and multiple REGs in the same group can result in good channel estimation performance.
The following describes in detail the mapping relationship between CCEs and REGs under different numbers of OFDM symbols in different mapping manners with reference to the drawings.
When 1 OFDM symbol is used for sending downlink control signaling, and the REGs are mapped to the CCEs in a non-interleaving mode, the REGs are sequenced in a frequency domain from small to large according to the frequency, and the CCEs are arranged in the frequency domain according to the ascending sequence of the REGs, namely 6 ascending sequences of the REGs form one CCE.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating the distribution of CCEs and REGs when 1 OFDM symbol is mapped in a non-interleaved manner in the embodiment of the present application. In fig. 2, numbers 0 to 23 identify 24 REGs, giving a total of 4 CCEs, and the CCEs with corresponding numbers from small to large are sorted from small to large according to the size of frequency.
In fig. 2, each CCE corresponds to 6 REGs, and the REGs with corresponding numbers from small to large are sorted in the frequency domain according to the order from small to large.
When 1 OFDM symbol is used for sending downlink control signaling and the REG is mapped to the CCE in an interleaving mode, the REGs are sequenced in a frequency domain from small to large according to the frequency sequence; defining a virtual REG group consisting of two consecutive REGs arranged in ascending order, each virtual REG group nVREGAnd REG group nREGAccording to a predetermined functional relationship, e.g. nVREG=f(nREG) Mapping is carried out, and the preset functional relation ensures that the virtual REG groups are uniformly distributed on the frequency domain; one CCE consists of 3 virtual REG groups arranged in ascending order.
In the embodiments of the present application, the REG groups refer to actual existing REG groups, as opposed to defined virtual REG groups.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating the distribution of CCEs and REGs when 1 OFDM symbol is mapped in an interleaving manner in the embodiment of the present application.
The numbers 0 to 23 in fig. 3 identify 24 REGs, giving a schematic diagram of the distribution of one CCE. REGs numbered 0 and 1 constitute a virtual REG group 1, REGs numbered 2 and 3 constitute a virtual REG group 2, and REG groups 4 and 5 constitute a virtual REG group 3, while REG group 1 includes REGs numbered 0 and 1, REG group 2 includes REGs numbered 6 and 7; REG group 3 includes REGs of numbers 12 and 13, and in fig. 3, virtual REG group 1 corresponds to REG group 1, virtual REG group 2 corresponds to REG group 5, and virtual REG group 3 corresponds to REG group 9. The virtual REG groups and REGs are mapped by a predetermined functional relation, which, as shown in fig. 3, achieves the effect of ensuring that the virtual REG groups are uniformly distributed in the frequency domain.
When 2 OFDM symbols are used for sending downlink control signaling and the REG is mapped to the CCE in a non-interleaving mode, the REGs are firstly sequenced in time domain from first to last and then sequenced in frequency domain from small to large; the CCEs are arranged in ascending REG order.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating the distribution of CCEs and REGs when 2 OFDM symbols are mapped in a non-interleaved manner in the embodiment of the present application.
In fig. 4, numbers 0 to 47 identify 48 REGs, the larger the number of REGs, the larger the frequency thereof; for a CCE numbered 0, the CCE indicates the smallest frequency, and the frequency of all REGs in the CCE numbered 1 is greater than the frequency of all REGs in the CCE numbered 0; in this way, there is no crossing in the frequency of REGs in each CCE, i.e., the frequency of REG No. 6 is greater than the frequency of REG No. 5.
When 2 OFDM symbols are used for sending downlink control signaling and the REGs are mapped to CCEs in an interleaving mode, the REGs are firstly sequenced in a time domain from first to last in sequence and then sequenced in a frequency domain from small to large in sequence; defining a virtual REG group consisting of two continuous REGs which are arranged in an ascending order, wherein each virtual REG group and each REG group are mapped according to a preset functional relation which ensures that the virtual REG groups are uniformly distributed on a frequency domain; one CCE consists of 3 virtual REG groups arranged in ascending order.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating the distribution of CCEs and REGs when 2 OFDM symbols are mapped in an interleaving manner in the embodiment of the present application.
Similar to LTE, the UE monitors PDCCH candidates for multiple aggregation levels in a designated search space to enable link-level adaptation of the PDCCH. In order to reduce the blind decoding complexity, a hierarchical nested search space structure is adopted.
And adopting a hierarchical nested search space structure, specifically configuring a candidate search space of an aggregation level except the highest aggregation level as a subset of the candidate search space of the highest aggregation level.
Referring to fig. 6, fig. 6 is a schematic diagram of different aggregation levels in the embodiment of the present application. The candidate search spaces with aggregation levels of 1, 2, and 4 in fig. 6 are a subset of the candidate search spaces with aggregation level 8.
Thus arranged, the channel estimation result of the NR-PDCCH candidate of the maximum aggregation level can be reused to demodulate NR-PDCCH candidates not of the maximum aggregation level.
To reduce the blocking probability, the search space for which the NR-PDCCH candidate is not the largest aggregation level candidate is randomized in a UE-specific fashion, while ensuring that the randomized result is also mapped in a hierarchical structure.
In particular, for each user, when a CCE coefficient is initialized in a candidate search space of an aggregation level other than the highest aggregation level, initialization is performed in a randomly selected manner.
Still taking fig. 6 as an example, for different UEs, the blocking probability of different terminals is reduced, e.g., by randomly setting the initial CCE coefficients of the candidate search spaces for each aggregation level of UE1 and UE2, while ensuring a hierarchically nested structure.
In summary, the present application configures the symbol length, the size of the frequency domain, the composition of REG and CCE, and the mapping manner for sending the downlink control signaling, so as to meet the requirement of downlink control channel transmission of the 5G system.
Since the 5G system supports different types of terminals, a new downlink control channel is designed. The patent provides OFDM symbol length and frequency domain bandwidth supported by a 5G downlink control channel, and provides a mapping mode from interlaced and non-interlaced CCEs to REGs under different OFDM symbol lengths. For the design of the search space, in order to reduce the blind decoding times of the terminal, a search space design method with different aggregation levels being hierarchical nesting is provided, and a method for reducing the blocking probability is provided.
The above-described aspects of the present invention take into account the characteristics of a 5G communication system to be applicable to various types of terminals.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method for configuring search space of downlink control channel is applied to a 5G system, and is characterized in that the method comprises the following steps:
when User Equipment (UE) monitors PDCCH candidates with a plurality of aggregation levels in a designated search space, configuring a search space structure adopting a hierarchical nested manner;
wherein the method further comprises:
for each UE, the configuration initializes in a randomly selected manner when CCE coefficients are initialized in candidate search spaces of aggregation levels other than the highest aggregation level.
2. The method of claim 1, wherein the hierarchically nested search space structure comprises:
the candidate search spaces for aggregation levels other than the highest aggregation level are a subset of the candidate search spaces for the highest aggregation level.
3. A device for configuring search space of downlink control channel is applied to a 5G system, and is characterized in that the device comprises: a configuration unit;
the configuration unit is used for configuring a search space structure adopting a hierarchical nested manner when a User Equipment (UE) monitors PDCCH candidates with a plurality of aggregation levels in a designated search space;
wherein,
the configuration unit is further configured to configure, for each UE, initialization in a randomly selected manner when a CCE coefficient is initialized in a candidate search space of an aggregation level other than the highest aggregation level.
4. The apparatus of claim 3, wherein the hierarchically nested search space structure comprises:
the candidate search spaces for aggregation levels other than the highest aggregation level are a subset of the candidate search spaces for the highest aggregation level.
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CN103312435A (en) * | 2012-03-09 | 2013-09-18 | 华为技术有限公司 | Method and device for modulation of control channel or determination of transmission layer |
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US8724636B2 (en) * | 2008-03-31 | 2014-05-13 | Qualcomm Incorporated | Methods of reliably sending control signal |
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CN102904851A (en) * | 2011-07-26 | 2013-01-30 | 中兴通讯股份有限公司 | Method and system for mapping PCFICH (physical control format indicator channel) |
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CN102638892B (en) * | 2012-03-26 | 2014-07-09 | 电信科学技术研究院 | Method and device for performing resource mapping to E-PDCCHs (enhanced-physical downlink control channels) |
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US10356770B2 (en) * | 2015-10-01 | 2019-07-16 | Qualcomm Incorporated | Techniques for using an enhanced physical control format indicator channel to identify characteristics of a control region including a set of physical downlink control channels |
WO2017111987A1 (en) * | 2015-12-22 | 2017-06-29 | Intel IP Corporation | Lte assisted prach transmission in 5g systems |
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CN103312435A (en) * | 2012-03-09 | 2013-09-18 | 华为技术有限公司 | Method and device for modulation of control channel or determination of transmission layer |
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