CN107294897A

CN107294897A - Downlink information sending, receiving method and device

Info

Publication number: CN107294897A
Application number: CN201610206022.2A
Authority: CN
Inventors: 石靖; 夏树强; 戴博; 张雯; 任敏; 韩祥辉
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-04-01
Filing date: 2016-04-01
Publication date: 2017-10-24
Anticipated expiration: 2036-04-01
Also published as: CN107294897B9; CN107294897B; WO2017167271A1

Abstract

The invention discloses a kind of downlink information sending, receiving method and device, wherein, this method includes：It is determined that include one or more Physical Downlink Control Channel sPDCCH one or more search spaces for receive Downlink Control Information, wherein, the search space includes at least one following resource：Part resource in part resource in part resource in subframe, short transmission time interval sTTI, orthogonal frequency division multiplex OFDM symbol；The Downlink Control Information is received on the one or more sPDCCH included by one or more search spaces of determination, the problem of solving the processing method of downlink information in correlation technique in correlation technique and can not support the sTTI of new granularity, it is ensured that time delay communication requirement.

Description

Downlink information sending and receiving method and device

Technical Field

The invention relates to the technical field of intelligent traffic, in particular to a method and a device for sending and receiving downlink information.

Background

With the increasing improvement of the commercial use of the fourth Generation mobile communication technology (the 4th Generation mobile communication technology, abbreviated as 4G) Long-Term Evolution (Long-Term Evolution, abbreviated as LTE)/Long-Term Evolution advanced (Long-Term Evolution/LTE-a), the requirement of the technical index of the next Generation mobile communication technology, namely the fifth Generation mobile communication technology (the 5th Generation mobile communication technology, abbreviated as 5G), is also increasing. It is widely accepted in the industry that next generation mobile communication systems should have the characteristics of ultra-high speed, ultra-high capacity, ultra-high reliability, and ultra-low delay transmission characteristics. For the index of ultra-low delay in 5G systems, it is currently accepted that the delay of the air interface is in the order of about 1 ms.

One method for effectively achieving ultra-low latency is to reduce the Transmission Time Interval (TTI) of the LTE system, and sufficiently shorten the processing latency unit to support the characteristic requirement of the 1ms air interface latency. At present, there are two methods for reducing TTI, one is to reduce the duration of a single OFDM symbol by expanding the subcarrier spacing of an Orthogonal Frequency Division Multiplexing (OFDM) system, and the method is involved in both a 5G high-frequency communication system and an ultra-dense network; another approach is to reduce the TTI length by reducing the number of OFDM symbols in a single TTI, as currently discussed by 3GPP, which has the advantage of being fully compatible with existing LTE systems.

In an existing LTE system, a Downlink Control Channel (PDCCH for short) occupies resource regions of first 0-4 OFDM symbols in a system bandwidth, and an Enhanced Downlink Control Channel (EPDCCH for short) uses a part of PRB resource regions in a Downlink data traffic Channel (PDSCH for short). Compared with the existing subframe with the length of 1ms TTI, the shortened TTI containing fewer OFDM symbols is used as the TTI with the new granularity, and the existing downlink control channel and the scheduling indication method cannot well support the TTI with the new granularity.

For the problem that the processing method of the downlink information in the related art cannot support the sTTI with the new granularity, no effective solution has been proposed yet.

Disclosure of Invention

The invention provides a method and a device for sending and receiving downlink information, which at least solve the problem that the processing method of the downlink information in the related technology cannot support the new granularity sTTI.

According to an aspect of the present invention, there is provided a downlink information receiving method, including: determining one or more search spaces comprising one or more physical downlink control channels (sPDCCH) for receiving downlink control information, wherein the search spaces comprise at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol; receiving the downlink control information DCI on the one or more sPDCCHs included in the one or more determined search spaces.

Further, the method further comprises: determining the resource position of the traffic channel according to at least one of the allocation indication of the DCI and the resource position of the DCI, wherein the resource position comprises at least one of the following modes: using continuous or discontinuous resource allocation in the sTTI frequency band, wherein the resource allocation comprises a region occupied by part or all of the sPDCCH; indicating whether sPDSCH occupies all resources in the sTTI band through signaling in the sTTI band; implicitly determining the resource position of the sPDSCH according to the resource occupied by the sPDCCH; and determining the resource position of the sPDSCH according to the resource occupation implication of the sPDCCH and combining the indication information, wherein the implication determination is to determine the resource position occupied by the scheduled sPDSCH according to the resource position occupied by the sPDCCH.

Further, the implicit rules include at least one of: the starting or ending sPRB where the sPDCCH is located is the same as the starting, ending or middle sPRB of the sPDSCH scheduled by the sPDCCH; indicating the resource occupation length of the scheduled sPDSCH in the DCI; indicating a resource starting offset value of the scheduled sPDSCH in the DCI; multiplying the starting or ending sPRB index of the sPDCCH by the multiple or coefficient of the predefined notification, DC notification I, RRC notification or SIB notification to determine the starting or ending or middle sPRB of the sPDSCH scheduled by the sPRC; multiplying the sPRBindex at the beginning or the end of the sPDCCH by the multiple or the coefficient of the predefining, the DCI notification, the RRC notification or the SIB notification to determine the resource occupation length of the scheduled sDSCH.

Further, the method further comprises: and the sPDSCH performs resource mapping on the allocated resource blocks, wherein the rate matching mode during resource mapping comprises the following steps: carrying out rate matching on the sPDCCH and the pilot frequency for scheduling the sPDSCH; or carrying out rate matching on the search space where the sPDCCH for scheduling the sPDSCH is positioned and the pilot frequency.

Further, the method further comprises: the terminal detects the search space, wherein the used resource of the search space is configured by at least one of the following means: partial resources are configured in the first x OFDM symbols in the sTTI, partial short sPRB resources are configured in the sTTI, and partial resources are configured in one or more OFDM symbols.

Further, the partial resource is one of: at least one physical Resource Bearer (srb) or Resource Element Group (REG) Resource in the subframe; at least one sPRB or REG resource in the sTTI; at least one sPRB or REG resource in one or more OFDM symbols, wherein the sPRB resource comprises 12 subcarrier resource units in the frequency domain within the limited number of time domain OFDM symbols.

Further, the frequency domain position and the time domain length of the sTTI are at least one of the following: a predetermined value, a predetermined pattern, a value of a higher layer signaling configuration, a value of a physical layer signaling configuration.

Further, the method further comprises: detecting at least one of the sPDCCH and the sPDSCH in the sTTI, wherein the frequency domain position of the sTTI is configured by at least one of the following modes under the condition of adopting high-layer signaling configuration and/or physical layer signaling configuration: configuring one sTTI band position, configuring a plurality of sTTI band positions through SIB by adopting RRC or DCI, and indicating the plurality of sTTI band positions through DCI by adopting RRC; or, the time domain length of the sTTI is configured by at least one of the following modes when a higher layer signaling configuration and/or a physical layer signaling is adopted: configuring a kind of sTTI length or pattern, configuring the sTTI length or pattern independently according to different sTTI bands, configuring the dynamic sTTI length, and combining the minimum sTTI length supported in the dynamic indication subframe or radio frame.

Further, the search space is one or more, and the carried DCI message format includes at least one of: the downlink grant DL grant, the uplink grant UL grant for ACK/NACK of transmission correct/error response message (ACK/NACK), and the downlink grant DL grant for common messages of scheduling common messages.

Further, in a case that the search space is one, a DCI message format carried by the search space includes at least one of: DL grant, UL grant for ACK/NACK, DL grant for common messages; under the condition that the number of the search spaces is two, the DCI message format carried by one search space only includes a DL grant, and the DCI message format carried by the other search space includes at least one of the following: DL grant, UL grant for ACK/NACK, DL grant for common messages.

Further, in the case that the search space is multiple, at least one of the multiple search spaces is located within the sTTIband.

Further, the method further comprises: when the sPDCCH is scrambled in the sTTI, the sPDCCH scrambling sequence initial value is determined by at least one of the following steps: sTTI serial number, wireless frame serial number, subframe serial number, slot number, OFDM symbol serial number, sTTI sub-band serial number, physical resource block PRB serial number.

According to another aspect of the present invention, there is also provided a downlink information sending method, including: configuring one or more search spaces comprising one or more Physical Downlink Control Channels (PDCCHs) for receiving downlink control information, wherein the search spaces comprise at least one of the following resources: a subframe, part of resources of a short transmission time interval (sTTI), and part of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms; and sending downlink control information to a terminal, wherein the downlink control information is used for the terminal to receive on the one or more PDCCHs included in one or more search spaces determined from the one or more configured search spaces.

Further, configuring one or more search spaces including one or more physical downlink control channels, PDCCHs, for receiving downlink control information comprises: configuring the use resources of the search space by at least one of: partial resources are configured in the first x OFDM symbols in the sTTI, partial short sPRB resources are configured in the sTTI, and partial resources are configured in one or more OFDM symbols.

Further, the partial resource is one of: at least one sPRB or REG resource in a subframe; at least one sPRB or REG resource in the sTTI; at least one sPRB or REG resource in one or more OFDM symbols, wherein the sPRB resource comprises 12 subcarrier resource units in the frequency domain within the limited number of time domain OFDM symbols.

Further, the method further comprises: configuring the frequency domain position of the sTTI by adopting a high-layer signaling configuration and/or a physical layer signaling through at least one of the following modes: configuring one sTTI band position, configuring a plurality of sTTI band positions through SIB by adopting RRC or DCI, and indicating the plurality of sTTI band positions through DCI by adopting RRC; configuring the time domain length of the sTTI by adopting a higher layer signaling configuration and/or a physical layer signaling through at least one of the following modes: configuring a kind of sTTI length or pattern, configuring the sTTI length or pattern independently according to different sTTI bands, configuring the dynamic sTTI length, and combining the minimum sTTI length supported in the dynamic indication subframe or radio frame.

Further, the search space is one or more, and the carried DCI message format includes at least one of: the system comprises a downlink grant DL grant, an uplink grant UL grant for ACK/NACK for transmitting ACK/NACK, and a downlink grant DL grant for common messages for scheduling common messages.

Further, in a case that the search space is one, a DCI message format carried by the search space includes at least one of: DL grant, UL grant for ACK/NACK, DL grant for common messages; under the condition that the number of the search spaces is two, the DCI message format carried by one search space only includes a DL grant, and the DCI message format carried by the other search space includes at least one of the following: DL grant, UL grant for ACK/NACK, DL grant common messages.

According to another aspect of the present invention, there is also provided a downlink information receiving apparatus, including: a first determining module, configured to determine one or more search spaces including one or more physical downlink control channels, sPDCCH, for receiving downlink control information, where the search spaces include at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms; a receiving module, configured to receive the downlink control information on the one or more spdcchs included in the determined one or more search spaces.

Further, the apparatus further comprises: the device further comprises: a second determining module, configured to determine a resource location of a traffic channel according to at least one of the allocation indication of the DCI and the resource location where the DCI is located, where the determining module includes at least one of the following manners: using continuous or discontinuous resource allocation in the sTTI frequency band, wherein the resource allocation comprises a region occupied by part or all of the sPDCCH; indicating whether sPDSCH occupies all resources in the sTTI band through signaling in the sTTI band; implicitly determining the resource position of the sPDSCH according to the resource occupied by the sPDCCH; and determining the resource position of the sPDSCH according to the resource occupation implication of the sPDCCH and combining the indication information, wherein the implication determination is to determine the resource position occupied by the scheduled sPDSCH according to the resource position occupied by the sPDCCH.

Further, the apparatus further comprises: a resource mapping module, configured to perform resource mapping on the allocated resource blocks by the sPDSCH, where a rate matching manner in resource mapping includes: carrying out rate matching on the sPDCCH and the pilot frequency for scheduling the sPDSCH; or carrying out rate matching on the search space where the sPDCCH for scheduling the sPDSCH is positioned and the pilot frequency.

Further, the apparatus further comprises: a first detection module, configured to detect the search space, wherein a resource used by the search space is configured by at least one of: configuring partial resources in the first x OFDM symbols in the sTTI; configuring a part of short sPRB resources in the sTTI; partial resources are configured in one or more OFDM symbols.

Further, the apparatus further comprises: a second detecting module, configured to detect the sPDCCH and the downlink data traffic channel PDSCH in the sTTI, where a frequency domain position of the sTTI is configured by at least one of the following manners when the high layer signaling configuration and/or the physical layer signaling configuration is adopted: configuring one sTTI band position, configuring a plurality of sTTI band positions through SIB by adopting RRC or DCI, and indicating the plurality of sTTI band positions through DCI by adopting RRC; the time domain length of the sTTI is configured by at least one of the following modes under the condition of adopting high-layer signaling configuration and/or physical layer signaling configuration: configuring a kind of sTTI length or pattern, configuring the sTTI length or pattern independently according to different sTTI bands, configuring the dynamic sTTI length, and combining the minimum sTTI length supported in the dynamic indication subframe or radio frame.

According to still another aspect of the present invention, there is provided a downlink information transmitting apparatus, including: a first configuration module, configured to configure one or more search spaces including one or more physical downlink control channels, PDCCHs, for receiving downlink control information, wherein the search spaces include at least one of the following resources: a subframe, part of resources of a short transmission time interval (sTTI), and part of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms; a sending module, configured to send downlink control information to a terminal, where the DCI is used for the terminal to receive on the one or more PDCCHs included in one or more search spaces determined from the one or more configured search spaces.

Further, the first configuration module comprises: a configuration unit, configured to configure the resource usage of the search space by at least one of: configuring partial resources in the first x OFDM symbols in the sTTI; configuring a part of short sPRB resources in the sTTI; partial resources are configured in one or more OFDM symbols.

Further, the apparatus further comprises: a second configuration module, configured to configure the frequency domain location of the sTTI by using a higher layer signaling configuration and/or a physical layer signaling through at least one of the following manners: configuring one sTTI band position, configuring a plurality of sTTI band positions through SIB by adopting RRC or DCI, and indicating the plurality of sTTI band positions through DCI by adopting RRC; configuring the time domain length of the sTTI by adopting a higher layer signaling configuration and/or a physical layer signaling through at least one of the following modes: configuring a kind of sTTI length or pattern, configuring the sTTI length or pattern independently according to different sTTI bands, configuring the dynamic sTTI length, and combining the minimum sTTI length supported in the dynamic indication subframe or radio frame.

By the invention, one or more search spaces comprising one or more physical downlink control channels (sPDCCH) for receiving downlink control information are determined, wherein the search spaces comprise at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol; the downlink control information is received on the one or more sPDCCHs included in the one or more search spaces, so that the problem that the processing method of the downlink information in the related technology cannot support the sTTI with the new granularity in the related technology is solved, and the requirement of time delay communication is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a flowchart of a downlink information receiving method according to an embodiment of the present invention;

fig. 2 is a flowchart of a downlink information transmitting method according to an embodiment of the present invention;

fig. 3 is a block diagram of a downlink information receiving apparatus according to an embodiment of the present invention;

fig. 4 is a first block diagram of a downlink information receiving apparatus according to a preferred embodiment of the present invention;

fig. 5 is a block diagram ii of a downlink information receiving apparatus according to a preferred embodiment of the present invention;

fig. 6 is a block diagram of a downlink information transmitting apparatus according to an embodiment of the present invention;

fig. 7 is a first block diagram of a downlink information transmitting apparatus according to a preferred embodiment of the present invention;

fig. 8 is a schematic diagram illustrating that the search space in the short TTI of the sPDCCH is configured as one and occupies part of the frequency domain resources in the first OFDM symbol according to an embodiment of the present invention;

fig. 9 is a schematic diagram of resources occupied when a search space in a short TTI of an sPDCCH is configured to be two according to an embodiment of the present invention;

fig. 10 is a schematic diagram of resource location of sPDSCH determined implicitly according to the resource occupied by sPDCCH or in combination with partial indication information according to an embodiment of the present invention;

fig. 11 is a schematic diagram of independently determining sTTI lengths in different sTTI bands and making the sTTI lengths in the same sTTI band the same according to the embodiment of the present invention;

fig. 12 is a schematic diagram illustrating determination of a variable value of the sTTI length in the sTTI band by using two-level DCI according to the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

An embodiment of the present invention provides a downlink information receiving method, and fig. 1 is a flowchart of a downlink information receiving method according to an embodiment of the present invention, and as shown in fig. 1, the method includes:

step S102, determining one or more search spaces including one or more physical downlink control channels sPDCCH for receiving downlink control information, where the search spaces include at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol;

step S104, receiving the downlink control information DCI on the one or more spdcchs included in the one or more determined search spaces.

Through the above steps, one or more search spaces including one or more physical downlink control channels sPDCCH for receiving downlink control information are determined, where the search spaces include at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol; the downlink control information is received on the one or more sPDCCHs included in the one or more search spaces, so that the problem that the processing method of the downlink information in the related technology cannot support the sTTI with the new granularity in the related technology is solved, and the requirement of time delay communication is ensured.

Further, determining the resource location of the traffic channel according to at least one of the allocation indication of the DCI and the resource location where the DCI is located may include at least one of the following manners: using continuous or discontinuous resource allocation in the sTTI frequency band, wherein the resource allocation comprises a region occupied by part or all of the sPDCCH; indicating whether sPDSCH occupies all resources in the sTTI band through signaling in the sTTI band; determining the resource position of sPDSCH implicitly according to the resource occupied by the sPDCCH, wherein the signaling can be 1 bit; determining the resource position of the sPDSCH implicitly according to the resource occupied by the sPDCCH and by combining the indication information, wherein the implicitly determining is to determine the resource position occupied by the scheduled sPDSCH according to the resource position occupied by the sPDCCH, and it should be noted that the implicitly determining the resource position of the traffic channel may be applied to the non-sTTI situation.

Further, the implicit rules include at least one of: the starting or ending sPRB where the sPDCCH is located is the same as the starting, ending or middle sPRB of the sPDSCH scheduled by the sPDCCH; indicating the resource occupation length of the scheduled sPDSCH in the DCI; indicating a resource starting offset value of the scheduled sPDSCH in the DCI; multiplying the starting or ending sPRB index of the sPDCCH by the multiple or coefficient of the predefined, DCI notification, RRC notification or SIB notification to determine the starting or ending or middle sPRB of the sPDSCH scheduled by the sPRC; multiplying the sPRBindex at the beginning or the end of the sPDCCH by the multiple or the coefficient of the predefining, the DCI notification, the RRC notification or the SIB notification to determine the resource occupation length of the scheduled sDSCH.

Further, the partial resource is one of: at least one physical resource Bearer (srb) or REG resource in a subframe; at least one sPRB or REG resource in the sTTI; at least one sPRB or REG resource in one or more OFDM symbols, wherein the sPRB resource comprises 12 subcarrier resource units in the frequency domain within the limited number of time domain OFDM symbols.

The frequency domain position predetermined value is a determined frequency band position, such as two sides of a system bandwidth, one or more of X frequency bands divided in the system bandwidth, a center of the system bandwidth, and the like. The concrete steps are as follows: the frequency domain positions on two sides of the system bandwidth are the lowest and the highest k PRBs, k is 2, 4, 8, 10, etc. The system bandwidth is divided into X frequency bands, and the number of PRBs included in each frequency band is preferably the same, or different values may be preferred. The predetermined pattern may preferably define X frequency bands of different frequency band sizes, or may sub-preferably X frequency bands of the same frequency band size.

The time domain length is predefined as one of 1-7 OFDM symbols. The predetermined pattern is a pattern defining the determined sTTI length in 1 subframe, e.g. 4 sTTI lengths in 1 subframe are 4, 3, 4, 3 OFDM symbols, respectively.

Further, the method further comprises: detecting at least one of the sPDCCH and the sPDSCH in the sTTI, wherein the frequency domain position of the sTTI is configured by at least one of the following modes under the condition of adopting high-layer signaling configuration and/or physical layer signaling configuration: configuring one sTTI band position, configuring a plurality of sTTI band positions through SIB by adopting RRC or DCI, and indicating the plurality of sTTI band positions through DCI by adopting RRC; the time domain length of the sTTI is configured by at least one of the following modes under the condition of adopting high-layer signaling configuration and/or physical layer signaling: configuring a kind of sTTI length or pattern, configuring the sTTI length or pattern independently according to different sTTI bands, configuring the dynamic sTTI length, and combining the minimum sTTI length supported in the dynamic indication subframe or radio frame.

Further, in a case that the search space is one, a DCI message format carried by the search space includes at least one of: DL grant, UL grant for ACK/NACK, DL grant for common messages; under the condition that the search spaces are two, the DCI message format carried by one search space only includes DL grant, and the DCI message format carried by the other search space includes at least one of the following: DL grant, UL grant for ACK/NACK, DL grant for common messages.

Further, when there are a plurality of search spaces, at least one of the search spaces is located within the sTTI band.

Further, when the sPDCCH is scrambled within the sTTI, the sPDCCH scrambling sequence initial value is determined by at least one of: sTTI serial number, wireless frame serial number, subframe serial number, slot number, OFDM symbol serial number, sTTI sub-band serial number, physical resource block PRB serial number. Under the condition that the sTTI index can be accurately known, scrambling based on the sTTI has a good randomization effect compared with scrambling based on the subframe. If the sTTI is the dynamic indication, the scrambling is based on the existing parameters, the dynamic sTTI index does not need to be known in advance, and when the sPDCCH of the sTTI with different lengths shares the search space, the scrambling based on the sPDCCH start OFDM symbol can avoid value conflict of the initial value of the sTTI, it needs to be noted that the scrambling method can be applied to the case of the non-sTTI.

An embodiment of the present invention further provides a downlink information sending method, and fig. 2 is a flowchart of a downlink information sending method according to an embodiment of the present invention, and as shown in fig. 2, the method includes:

step S202, configuring one or more search spaces including one or more Physical Downlink Control Channels (PDCCH) for receiving downlink control information, wherein the search spaces include at least one of the following resources: a subframe, part of resources of a short transmission time interval (sTTI), and part of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms;

step S204, sending downlink control information to the terminal, where the downlink control information is used for the terminal to receive on the one or more PDCCHs included in the one or more search spaces determined from the one or more configured search spaces.

Further, in a case that the search space is one, a DCI message format carried by the search space includes at least one of: DL grant, UL grant for ACK/NACK, DL grant for common messages;

under the condition that the search spaces are two, the DCI message format carried by one search space only includes a DLgrant, and the DCI message format carried by the other search space includes at least one of the following: DL grant, UL grant for ACK/NACK, DL grant for common messages.

An embodiment of the present invention provides a downlink information receiving apparatus, and fig. 3 is a block diagram of a downlink information receiving apparatus according to an embodiment of the present invention, as shown in fig. 3, including:

a first determining module 32, configured to determine one or more search spaces including one or more physical downlink control channels sPDCCH for receiving downlink control information, where the search spaces include at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms;

a receiving module 34, configured to receive the downlink control information on the one or more spdcchs included in the determined one or more search spaces.

Fig. 4 is a first block diagram of a downlink information receiving apparatus according to a preferred embodiment of the present invention, and as shown in fig. 4, the apparatus further includes:

a second determining module 42, configured to determine a resource location of a traffic channel according to at least one of the allocation indication of the DCI and the resource location where the DCI is located, where the determining includes at least one of the following manners: using continuous or discontinuous resource allocation in the sTTI frequency band, wherein the resource allocation comprises a region occupied by part or all of the sPDCCH; using 1bit in the sTTI band to indicate whether the sPDSCH occupies all resources in the sTTI band; implicitly determining the resource position of the sPDSCH according to the resource occupied by the sPDCCH; and determining the resource position of the sPDSCH according to the resource occupation implication of the sPDCCH and combining the indication information, wherein the implication determination is to determine the resource position occupied by the scheduled sPDSCH according to the resource position occupied by the sPDCCH.

Fig. 5 is a block diagram ii of a downlink information receiving apparatus according to a preferred embodiment of the present invention, and as shown in fig. 5, the apparatus further includes: a first detecting module 52, configured to detect the search space, wherein the resource used in the search space is configured by at least one of: configuring partial resources in the first x OFDM symbols in the sTTI; configuring a part of short sPRB resources in the sTTI; partial resources are configured in one or more OFDM symbols.

An embodiment of the present invention further provides a downlink information transmitting apparatus, and fig. 6 is a block diagram of the downlink information transmitting apparatus according to the embodiment of the present invention, as shown in fig. 6, including:

a first configuring module 62, configured to configure one or more search spaces including one or more physical downlink control channels, PDCCHs, for receiving downlink control information, wherein the search spaces include at least one of the following resources: a subframe, part of resources of a short transmission time interval (sTTI), and part of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms;

a sending module 64, configured to send downlink control information to a terminal, where the downlink control information is used for the terminal to receive on the one or more PDCCHs included in one or more search spaces determined from the one or more configured search spaces.

Fig. 7 is a first block diagram of a downlink information transmitting apparatus according to a preferred embodiment of the present invention, and as shown in fig. 7, the first configuration module 62 includes:

a configuration unit 72, configured to configure the resource usage of the search space by at least one of: configuring partial resources in the first x OFDM symbols in the sTTI; configuring a part of short sPRB resources in the sTTI; partial resources are configured in one or more OFDM symbols.

The following examples are provided to further illustrate the present invention.

In order to solve the problem that the existing downlink control channel and scheduling indication method cannot well support the new-granularity TTI and reduce the receiving detection complexity in a low-delay communication scene, the embodiment of the invention provides a downlink information receiving method suitable for low-delay requirements, which mainly solves the problems of downlink control channel detection and data receiving in the short TTI containing fewer OFDM symbols, can reduce the detection processing complexity, can correspondingly obtain shorter RTT (round trip time) delay under the condition of the new-granularity short TTI, and ensures the low-delay communication requirement.

And the terminal acquires the DCI (downlink control information) by detecting the downlink control channels in the corresponding candidate set of the search space in the configured downlink control channel search space. The downlink control channel searching space is located in a part of resource positions in a subframe or an sTTI or an OFDM symbol. The length of the sTTI is a fixed value or a fixed pattern, or is configured through high-layer signaling or physical layer signaling, preferably RRC or SIB signaling.

The DCI is independent DCI, or second-stage DCI with partial parameters obtained according to first-stage DCI or high-level signaling configuration. The downlink control channel may be abbreviated as spdcch (short pdcch), where the sTTI is a TTI that is less than 1ms in time, and for the application to the LTE system, the short TTI is composed of N OFDM symbols, and the number N of the OFDM symbols included is at least one of {1, 2,3, 4, 5, 6, and 7 }. If the sTTI comprises N OFDM symbols, the sPDCCH or the search space occupies X OFDM symbols in the time domain, X is less than or equal to N, and the value of X is preferably 1. And the X OFDM symbols are located at the first X OFDM symbols of the N OFDM symbols of the sTTI. The value of X may be fixed or configured by the base station. The downlink control channel search space is located at a part of resource positions in a subframe, an sTTI or an OFDM symbol, part of resources are part of sPRB or REG resources in the subframe, the sTTI or one or more OFDM symbols, or part of resources are part of sPRB or REG resources in the OFDM symbol, and the sPRB resources comprise 12 subcarrier resource units in a frequency domain within a limited time domain OFDM symbol number; further, the resource unit in the frequency domain may also use the srbs in a polymerization manner, and use or configure the set of N srbs; similar REGs may also be used for aggregation.

Further, the configured search space is one or more, and the carried DCI message format includes at least one of: DL grant, UL grant for ACK/NACK, DL grant for common messages.

(1) When the configured search space is one, the DCI message format carried by the search space includes at least one of: DL grant, UL grant for ACK/NACK, DL grant for common messages.

(2) When the number of the configured search spaces is two, the DCI message format carried by one search space only includes a DLgrant, and the DCI message format carried by the other search space includes at least one of the following: DL grant, UL grant for ACK/NACK, DL grant for common messages. When the search space is multiple, at least one of the multiple search spaces is located within the sTTI band.

Preferably, one search space carries only DL grant, and the other search space carries at least one of UL grant, UL grant for ack/NACK.

Further, the manner of configuring the search space usage resource includes at least one of: configuring partial resources in the first x OFDM symbols in the sTTI; configuring partial short PRB resources in the sTTI; some resources are configured in one or more OFDM symbols, and it should be noted that the above configuration method of the search space can be applied to the case of non-sTTI.

When some resources are configured in one or more OFDM symbols, there is no sTTI restriction, and the method is applicable to a scenario in which the sTTI length is dynamically determined, where different sTTI lengths may share the same search space, for example, sTTI lengths corresponding to two UEs are different, and search spaces configured by a base station are all detected in one or more OFDM symbols in overlapped OFDM symbols, it should be noted that the search spaces configured by a base station in all OFDM symbols may be included, and preferably the first one of the overlapped OFDM symbols is used.

When the configured search space is one, the above manners may be all adopted, and fig. 8 is a schematic diagram that the search space in the short TTI of the sPDCCH according to the embodiment of the present invention is configured to be one and occupies part of frequency domain resources in the first OFDM symbol, as shown in fig. 8, only one search space configured in the sTTI is located in part of the srb or REG resources in the first OFDM symbol in the sTTI. Configured to the terminal by SIB or RRC.

When two search spaces are configured, both search spaces are located in the sTTI band. Preferably, one search space configures partial resources in the first x OFDM symbols in sTTI, and the other search space configures partial short PRB resources in sTTI. Fig. 9 is a schematic diagram of resources occupied when the search space in the short TTI of the sPDCCH is configured as two, and as a preferred mode shown in fig. 9, the search space containing only the DL grant occupies part of the srbs or REG resources in the first OFDM symbol in the sTTI. Configured to the terminal by SIB or RRC. Another search space containing UL grant and DL ACK/NACK occupies part of the srbs in all OFDM symbols in the sTTI band or occupies part of the srbs or PRBs outside the sTTI band.

When the configured search spaces are two, and one of the search spaces is located in the sTTI band. Preferably, one of the search spaces configures partial resources (located in the sTTI band) in the first x OFDM symbols in the sTTI, and the other search space configures partial PRB resources (not limited by the sTTI band, located outside the sTTI band) in the subframe. The search space containing only DL grant occupies part of the srb or REG resources in the first OFDM symbol in sTTI. Configured to the terminal by SIB or RRC. Another search space containing the ul grant and DL ACK/NACK occupies part of the PRB in all OFDM symbols in the subframe.

Further, the PDSCH resource allocation indication in the DCI includes at least one of the following ways: continuous or discontinuous resource allocation is used in the sTTI band, and the resource allocation comprises a region occupied by the sPDCCH; and using 1bit to indicate whether the sPDSCH occupies all resources in the sTTI band, if not, implicitly determining the resource position of the sPDSCH according to the resources occupied by the sPDCCH or combining part of indication information. Wherein, the implicit determination mode is to determine the resource position occupied by the sPDSCH scheduled by the sPDCCH according to the resource position occupied by the sPDCCH. Specifically, the number of sPDSCH is divided according to the number of sPDCCH in the sTTI band, and frequency domain resource ranges of different sPDSCH are predefined, for example, as shown in fig. 10 (a), the search space includes 2 sPDCCH candidate sets, the sPDSCH resource occupation corresponding to each sPDCCH is predefined, for example, 1/2 of the frequency domain range of the sTTI band, and the resource occupied by the sPDSCH is the frequency domain range including the sPDCCH of the scheduling information. Or as shown in fig. 10 (b) or fig. 10 (c), the candidate set occupied by the sPDCCH is a discrete PRB or REG, the resource position occupied by the scheduled sPDSCH is starting from the PRB occupied by the sPDCCH, the occupied frequency-domain width is implicitly determined by allocating the PRB from the search space, for example, the search space is configured as 2 candidate sets and occupies 4 positions, the sPDSCH occupies a range from the starting of the PRB occupied by the sPDCCH to the starting of the PRB occupied by another candidate set, that is, the configured candidate set occupies the position of the sPRB in which the sPDSCH resource allocation has been considered. Or the resource position occupied by the sPDSCH scheduled by the sPDSCH is started, middle or ended by PRB occupied by the sPDCCH, and the sPDSCH occupies the frequency domain resource size after the sPRB occupied by the sPDCCH is started and is indicated by DCI to occupy the frequency domain width. The implicit rules described above include at least one of: the starting or ending sPRB where the sPDCCH is located is the same as the starting, ending or middle sPRB of the sPDSCH scheduled by the sPDCCH; indicating the resource occupation length of the scheduled sPDSCH in the DCI; indicating a resource starting offset value of the scheduled sPDSCH in the DCI; multiplying the starting or ending sPRB index of the sPDCCH by the multiple or coefficient of the predefined notification, DC notification I, RRC notification or SIB notification to determine the starting or ending or middle sPRB of the sPDSCH scheduled by the sPRC; multiplying the starting or ending sPRB index of the sPDCCH by a multiple or a coefficient of the predefined, DCI notification, RRC notification or SIB notification to determine the resource occupation length of the scheduled sDSCH.

Further, the rate matching method when the sPDSCH performs resource mapping on the allocated resource blocks includes: and carrying out rate matching on the sPDCCH and the pilot frequency which are scheduled. And carrying out rate matching on the search space where the sPDCCH is scheduled and the pilot.

Fig. 10 is a schematic diagram of implicitly determining or determining the resource location of the sPDSCH in combination with the partial indication information according to the resource occupied by the sPDCCH in the embodiment of the present invention, as shown in fig. 10 (a), the sPDCCH can use partial resources in the resource region used by the sPDCCH in a self-contained manner or an embedded manner regardless of the sPDSCH occupied by continuous or discontinuous resources. Wherein the self-contained approach is achieved by rate matching only the sPDCCH and pilot scheduled for it, as shown in (b) of fig. 10. The embedded mode is realized by performing rate matching on the search space where the sPDCCH or the sPDCCH is scheduled and the pilot, as shown in (c) of fig. 10. Here, the pilots include a cell common reference signal, a UE-specific reference signal, and the like.

Further, the obtaining manner of the sTTI frequency domain position includes at least one of: only one sTTI band frequency domain position is configured; configuring a plurality of sTTI band positions through SIB, and configuring a specific sTTI band position by RRC or DCI; the specific sTTI band location is configured by the RRC by the DCI indicating a plurality of sTTI band locations. The configuration signaling comprises at least one of high-layer signaling semi-static configuration and physical layer signaling. Wherein, the first mode only uses the semi-static configuration of the high-layer signaling and comprises the configuration by using SIB or RRC; the method specifically comprises the following steps: SIB configures 1 sTTI band; or SIB configures a plurality of sTTI bands, and the sTTI band where the UE is located is determined by display (RRC) or implicit (UE ID/RNTI); or the RRC configures the sTTI band where the UE is located. The second approach uses only physical layer signaling including CFI or DCI to indicate the sTTI band frequency domain location, where the DCI is preferably the first stage of a two-stage DCI. One or more sTTI bands are indicated, and the UE determines through implicit (UE ID/RNTI); and the mode III simultaneously uses the semi-static configuration of the high-layer signaling and the dynamic indication of the physical-layer signaling. For the mode three, the first-level DCI notifies a plurality of sTTI band locations, and the RRC configures which sTTI band the UE specifically uses; or the SIB informs a plurality of sTTI band positions, and the first level DCI indicates which sTTI band the UE specifically uses.

Further, the obtaining manner of the time domain length of the sTTI includes at least one of: only one kind of sTTI length or pattern is configured; independently configuring the sTTI length or pattern according to different sTTI bands; configuring the length of the dynamic sTTI, and optionally combining the length of the minimum sTTI supported in the dynamic indication of the subframe or the radio frame. The configuration signaling comprises at least one of high-layer signaling semi-static configuration and physical layer signaling. Wherein the method 1: sTTI length is configured by SIB or RRC (semi-statically variable). The method specifically comprises the following steps: (1) SIB configures 1 kind of sTTI length; (2) (optionally, SIB configures multiple sttiength sets), and the RRC configures a specific sTTI length according to different sTTI bands, that is, may configure { sttienband, sTTI length } in a combined manner, or may configure the sTTI lengths separately. The method 2 comprises the following steps: sTTI length is indicated by a similar CFI configuration or first level DCI (subframe level variable), where indicated by the first level DCI includes an sTTI length indicating a fixed length or fixed pattern. The method 3 comprises the following steps: sTTI length is configured by second level DCI (sTTI level variable). The method 4 comprises the following steps: collectively indicated by first-level DCI and second-level DCI. The first-level indication is the minimum sTTI length supported in the subframe, and the second-level DCI indicates the length of the sTTI corresponding to the actual PDSCH.

Further, the sPDCCH scrambling sequence initial value comprises at least one of the following values

When the downlink control channel is scrambled in the short TTI, the initial value of the scrambling sequence is determined by at least one of the serial number of the short TTI, the serial number of the wireless frame, the serial number of the subframe, the serial number of the time slot, the serial number of the OFDM symbol, the serial number of the sTTI sub-band and the serial number of the PRB.

Specifically, when the base station side transmits the SPDCCH, the initial value determination method used by the scrambling sequence includes at least one of the following:

the scrambling initial value is determined by the short TTI number, wherein the scrambling sequence initial value may specifically consider: based on the short TTI sequence number sTTI within a 1ms sub-frame or based on the short TTI sequence number sTTI within a 10ms radio frame,n_TTIrepresenting the number of sTTI in a subframe or the number of sTTI in a radio frame, e.g. a short TTI of 2OFDM symbols, 7 sTTI per subframe in normal cp, 70 sTTI per radio frame, based on the subframe time n_TTI0,1, …,6, based on radio frame time n_TTI0,1, …, 69. In addition, if the sTTI length is semi-static and variable, for example, the sTTI length is configured by the SIB, the terminal may determine the value of the sTTI index. The previous sTTI length is used before SIB update. If the sTTI length is dynamically variable, for example, the sTTI length is configured by DCI, the terminal determines the sTTI index by receiving a physical layer signaling notifying the number/sequence number of sTTI, for example, when the sTTI length is indicated by the second-level DCI, the first-level DCI notifies the number/sequence number of sTTI; when the sTTI length is indicated by DCI, additional physical layer signaling like CFI informs the sTTI number/sequence number.

Scrambling initial values by short TTI sequenceThe number and slot number are determined to distinguish scrambling sequences of different short TTIs in the radio frame. For example, 1 subframe has 7 short TTIs with the length of 2OFDM symbols, and the initial value is determined to ben_TTIDenotes the sTTI number in the subframe, n_TTI＝0,1,…,6。

The scrambling initial value is determined by the subframe number or the radio frame number or the time slot number, wherein the initial value is determined based on the subframe number in a manner ofIf a wireless frame number is used,if a time-slot number is used,

the scrambling initial value is determined by the OFDM symbol serial number OFDM index, and the sTTI length corresponding to the sPDSCH is no matter what the sTTI length is, the sPDCCH only uses the initial OFDM symbol in the occupied resource position as the scrambling parameter. On the basis of the OFDM symbols it is possible to,when normal CP is used, the scrambling sequences for 14 different TTIs in 1ms are distinguished, l being 0,1, …, 13. When Extended CP is used, the scrambling sequences for 12 different TTIs in 1ms are distinguished, l being 0,1, …, 11. Preferably, scrambling is applied to scenarios with dynamically determined sTTI based on OFDM symbols, and sPDCCH in different sTTI lengths uses OFDM-based index as a scrambling parameter in the same OFDM symbol.

And the scrambling initial value is determined by the sequence number of the sTTI sub-band or the PRB sequence number, and the PRB index or the sTTI band index which is started in the sTTI band is used as a scrambling parameter. Different scrambling sequences are used for different sTTI bands in a subframe. The same scrambling sequence is used for the same sTTI band in a subframe. Based on the PRB index,or-distinguishing scrambling sequences, n, of different sTTI bands in a subframe_{sTTI_band}0 or 0,1,2, 3. The method for obtaining the starting PRB index or sTTI band index in the sTTI band includes the sTTI frequency domain position determination method in the patent, for example, the first-level DCI notification in two-level DCI, SIB or RRC signaling configuration.

Further, if the sPDCCH is self-contained/embedded, the sPDCCH is not shared any more, and C-RNTI or Group-RNTI is used for replacing the sPDCCHGenerating a scrambling initial value or a parameter value of the RRC configured UE-specific.

Example 1

And the base station schedules the sPDSCH through the two-stage DCI. The first-level DCI indicates that the sTTI band has a fixed sTTI length/pattern, and different sTTI bands independently determine the respective sTTI length/pattern. Wherein the first level DCI is located in legacy pdcch, or first sTTI.

Fig. 11 is a schematic diagram of independently determining the sTTI lengths in different sTTI bands and having the same sTTI length in the same sTTI band according to the embodiment of the present invention, as shown in fig. 11, different sTTI bands are used for terminal groups or service groups with different latency requirements, and the sTTI length in the same sTTI band is unique. In fig. 11, 2 sTTI bands are included in a subframe as an example, sTTI lengths in different sTTI bands are determined independently, and only one sTTI length in the same sTTI band is used. The specific signaling content is that the first-level DCI indicates an sTTI band and one length per band. The second level DCI indicates the remaining control information. Such as MCS, RV, NDI, etc. Wherein the first stage may indicate the sTTI length and/or the sTTI frequency band of the plurality of sTTI bands independently or jointly. As shown in table 1.

It should be noted that fig. 11 is merely an illustration. There may be no SPDCCH or SPDCCH in the first sTTI. For example, the first sTTI has no SPDCCH in the single DCI, and the first sTTI has SPDCCH in the two-level DCI; or the sTTI division starts from the Legacy PDCCH region, and the first sTTI has SPDCCH.

TABLE 1 first level DCI Format

Or the first level DCI is as shown in table 2.

TABLE 2 first level DCI Format

Wherein the indication of the plurality of sTTI bands and the frequency domain position of each band may be represented by a joint coding value r, as shown in formula (1), which is one of the preferred manners. Where r indicates M sTTI bands, the starting and ending srb positions of each sTTI band are indicated. The start PRB and the end PRB of the mth sTTI band are represented by S_2(m-1)And S_2(m-1)+1Wherein M is 1, 2. Wherein N is the number of PRBs corresponding to the system bandwidth. i is 0,1,2 …, 2M-1. Wherein S_iThe value ranges from 1 to N.

Wherein K ═ Represents rounding up;

c is an integer constant.

S_iAre mutually different positive integers in a monotonic function, that is: s₀＜S₁＜S₂. Or S₀＞S₁＞S₂。

In this way, the similarity is not allowed to occur: s₀＝5，S₁＝8,S₂＝3,S₄When PRBs of different sTTI bands overlap, such as 10.

Note that the joint coding is only for the sTTI band joint coding, and there is no particular limitation on other bit fields included in the DCI including the sTTI band joint coding bit field. For example: whether the DCI of the sTTI band joint coding bit field further includes the sTTI length bit field is not particularly limited, and whether the DCI of the sTTI band joint coding bit field includes the sTTI length bit field may be all the sTTI band joint coding bit field, and the indication implementation of the sTTI band joint coding bit field is not affected. The frequency domain location joint resource allocation of multiple TTI bands is also applicable to non-sTTI.

The terminal firstly receives and detects the downlink control information, and then receives the downlink service information according to the downlink control information indication.

The terminal detects two-level DCI in the Legacy PDCCH region and the configured search space. The principle is to consider that the blind detection complexity is not increased compared with the blind detection complexity in the existing 1ms subframe. For example: the total blind detection times of the two-stage DCI are the same as the blind detection times of the LegacyPDCCH in a 1ms subframe.

The first-level DCI is blindly detected in the Legacy PDCCH region.

The method comprises the following steps: reference may be made to the number of blind tests of the CSS. The candidate set totals 4. Two aggregation levels are supported, 2 candidate sets per aggregation level. The method 2 comprises the following steps: define the Group-SS between CSS and USS. The candidate set is between 4 and 16.

The terminal firstly receives and detects first-stage DCI in a Legacy PDCCH region, determines the position of an sTTIband for subsequent reception and detection, and detects second-stage DCI in a predefined or configured search space in the corresponding sTTIband. Or the terminal firstly receives and detects the first-level DCI in the Legacy PDCCH region to determine possible multiple sTTI bands, and detects the second-level DCI in the corresponding sTTI bands according to the specific sTTI bands configured by the RRC.

The second level DCI is detected in the first L OFDM symbols in the sTTI band. L is less than or equal to the number of symbols contained in the sTTI.

Considering that 1 subframe comprises a plurality of sTTIs, the number of sPDCCH detection candidate sets in each sTTI is x, and the value of x is suggested to be 1,2 or 4. The location of the detected sPDCCH may be determined by the search space configuration.

The method comprises the following steps: a fixed number x of candidate sets is detected. And detecting the sum of the candidate sets corresponding to the y aggregation levels to be x in total. The method 2 comprises the following steps: and determining the number of the candidate sets x detected in the sTTI according to the sTTI length indicated by the first level. If the sTTI length is shorter, e.g. 1 or 2, x is 1 or 2, and if the sTTI length is longer, e.g. 3-4 or 7, x is 2 or 4. The sum of the candidate sets of the respective detected aggregation levels y is x.

When the terminal receives and detects the sPDSCH, in an sTTI band:

if x is 1, there is only one UE in one sTTI, and the PDSCH channel is rate-matched in REs except for sPDCCH and RS occupancy. The second level DCI need not indicate the frequency domain resource allocation of the SPDSCH.

If x >1, more than 1 UE is supported in one sTTI, the PDSCH channel is rate matched in REs except for sPDCCH and RS occupancy. When the sPDCCH does not independently occupy the OFDM symbol, the allocated PDSCH resource occupation is in a self-contained/embedded form if the allocated PDSCH resource occupation includes the sPDCCH resource occupation range for scheduling the sPDCCH. The second level DCI needs to indicate the frequency domain resource allocation of the sPDSCH. (1) Continuous or discontinuous resource allocation is used in the sTTI band, and the resource allocation comprises a region occupied by the sPDCCH;

(2) and using 1bit to indicate whether the sPDSCH occupies all resources in the sTTI band, if not, implicitly determining the resource position of the sPDSCH according to the resources occupied by the sPDCCH or combining part of indication information.

The implicit determination mode is to determine the resource position occupied by the sPDSCH scheduled by the sPDCCH according to the resource position occupied by the sPDCCH. Specifically, the number of sPDSCH is divided according to the number of sPDCCH in the sTTI band, and frequency domain resource ranges of different sPDSCH are predefined, for example, as shown in fig. 10 (a), the search space includes 2 sPDCCH candidate sets, the sPDSCH resource occupation corresponding to each sPDCCH is predefined, for example, 1/2 of the frequency domain range of the sTTI band, and the resource occupied by the sPDSCH is the frequency domain range including the sPDCCH of the scheduling information. Or as shown in fig. 10 (b) or fig. 10 (c), the candidate set occupied by the sPDCCH is a discrete PRB or REG, the resource position occupied by the scheduled sPDSCH is starting from the PRB occupied by the sPDCCH, the occupied frequency domain width is implicitly determined by allocating PRB by the search space or indicated by the DCI, for example, the search space is configured as 2 candidate sets, and occupies 4 positions, the sPDSCH occupies a range from the start of the PRB occupied by the sPDCCH to the start of the PRB occupied by another candidate set, or the DCI indicates that the sPDSCH occupies the frequency domain resource size after the start of the PRB occupied by the sPDCCH.

The speed matching mode when the sPDSCH performs resource mapping on the allocated resource blocks comprises the following steps: and carrying out rate matching on the sPDCCH and the pilot frequency which are scheduled. Or carrying out rate matching on the search space where the sPDCCH is scheduled and the pilot.

By the scheme of the embodiment, the second-level DCI is detected in the configured search space by indicating the short TTI length through the first-level DCI in the sTTI band, and the detection position does not need to be executed on each OFDM symbol, so that the detection complexity is reduced. And the resource position of the sPDSCH is obtained according to part of the DCI information, so that the resource allocation overhead is saved.

Preferred embodiment 2

And the base station schedules the sPDSCH through the two-stage DCI. The first level indicates the minimum sTTI length in the subframe, and the second level indicates the sTTI length. Wherein the first level DCI is located in Legacy PDCCH, or first sTTI.

The detection of the sPDCCH requires knowledge of the minimum sTTI length, so that at the second level the dynamic sTTI length is informed that at least the possible detected OFDM symbol positions can be known and not necessarily every OFDM symbol is detected. While multiple sTTI bands are still optional. Fig. 12 is a schematic diagram illustrating that two-level DCI determines that the sTTI length in an sTTI band is a variable value, as shown in fig. 12, taking 2 sTTI bands contained in a subframe as an example, the sTTI lengths in different sTTI bands are independently determined, the sTTI with the minimum granularity indicated by the first level has, and the second-level DCI indicates the variable length of the sTTI.

Blind detection frequency reduction analysis during detection: (A) if the minimum sTTI length in the subframe is 1 OFDM symbol, blind detection needs to be performed on each OFDM symbol, as shown in the first sTTI band above in fig. 5, the actual variable sTTI length is notified by the second-level DCI, where the actual variable sTTI length includes the case of the minimum 1 OFDM symbol, and the first-level DCI notifies that the minimum sTTI length in the subframe is 1 OFDM symbol. Every OFDM symbol is detected, and the actual effective sPDCCH detection position is as indicated by the dashed box in the figure. (B) If the minimum sTTI length in the subframe is 2OFDM symbols, blind detection needs to be performed every 2OFDM symbols, as shown in the second sTTI band below in fig. 12, the actual variable sTTI length is notified by the second-level DCI, where the minimum sTTI length includes the situation of the minimum 2OFDM symbols, and the first-level DCI notifies that the minimum sTTI length in the subframe is 2OFDM symbols, then the detection complexity at this time is reduced by half, and the actual effective sPDCCH detection position is the position indicated by the dashed box in the drawing.

Specific signaling contents are that the first-level DCI indicates sTTI band, sTTI minimum length sTTI _ length _ min, PRB allocation, and the like, as shown in table 1. The second level DCI indicates the sTTI length and the remaining control information, such as MCS, RV, NDI, etc.

TABLE 3 first level DCI Format

The terminal detects two-level DCI in the Legacy PDCCH region and the configured search space. The principle is to consider that the blind detection complexity is not increased compared with the blind detection complexity in the existing 1ms subframe. For example: the total blind detection times of the two-stage DCI are the same as the blind detection times of the LegacyPDCCH in a 1ms subframe. The configured search space is configured under the condition of the minimum sTTI granularity, for example, the minimum sTTI is 1 OFDM symbol, the search space is configured in each OFDM symbol in the subframe except for the Legacy PDCCH region, for example, the minimum sTTI is 2OFDM symbols, the sTTI is divided in the subframe according to the Legacy PDCCH region, and the search space is configured in the sTTI without the Legacy PDCCH.

The first-level DCI is blindly detected in the Legacy PDCCH region.

The terminal firstly receives and detects first-stage DCI in a Legacy PDCCH region to determine the position of an sTTIband for subsequent reception and detection, and detects second-stage DCI in a search space correspondingly configured according to the minimum sTTI length in the corresponding sTTI band.

The second level DCI is detected in the first L OFDM symbols in the sTTI band. L is less than or equal to the number of symbols contained in the minimum sTTI length. Preferably, L ═ 1.

When the terminal receives and detects the sPDSCH, in an sTTI band:

By the scheme of the embodiment, the second-level DCI is detected in the search space correspondingly configured to the minimum sTTI by indicating the short minimum TTI length through the first-level DCI in the sTTI band, and when the minimum sTTI is greater than 1 OFDM symbol, execution on each OFDM symbol is avoided, so that detection complexity is reduced. And the resource position of the sPDSCH is obtained according to part of the DCI information, so that the resource allocation overhead is saved.

Example 3

The base station schedules the sPDSCH through a single DCI.

The sTTI band determination method comprises:

the method A comprises the following steps: sTTI band is configured by SIB or RRC (semi-statically variable).

The method specifically comprises the following steps: (1) SIB configures 1 sTTI band; (2) the SIB configures a plurality of sTTI bands, and the sTTIBand where the UE is located is determined by display (RRC) or implicit (UE ID/RNTI). (3) And the RRC configures the sTTI band where the UE is located.

The method B comprises the following steps: sTTI band is configured by similar CFI. (variable sub-frame level)

The determination mode of sTTI length is as follows:

the method comprises the following steps: sTTI length is configured by SIB or RRC (semi-statically variable). The method specifically comprises the following steps: (1) SIB configures 1 kind of sTTI length; (2) (optionally, SIB configures multiple sTTI length sets), and the RRC configures a specific sTTI length according to different sTTI bands, that is, may configure { sTTI band, sTTI length } in a combined manner, or may configure the sTTI band and the sTTI length separately.

The method 2 comprises the following steps: sTTI length is configured by similar CFI (subframe level variable).

The method 3 comprises the following steps: sTTI length is configured by DCI (sTTI level variable).

Remarking: the above sTTI band and sTTI length configurations may be combined with each other, preferably as a1, a2, B2.

Single DCI content: sTTI length (optional), RA for traffic (optional), MCS, RV, NDI, etc

sTTI length indication is dependent on whether sTTI dynamic variable in sub-frame is supported or not, as before second level DCI analysis; RA for traffic indication is dependent on whether more than 1 UE is supported in sTTI, as with the previous second level DCI analysis.

And the terminal detects DCI in different sTTI in the Legacy PDCCH region and the configured search space. The principle is to consider that the blind detection complexity is not increased compared with the blind detection complexity in the existing 1ms subframe. For example: the total blind detection times of DCI in the short TTI contained in the 1ms subframe are the same as the blind detection times of Legacy PDCCH in the 1ms subframe.

Optionally, the DCI in the first sTTI is blindly detected in the Legacy PDCCH region.

And the terminal receives and detects the sPDSCH reception in the first sTTI in the DCI determination subframe in the Legacy PDCCH region, and detects the DCI in the configured search space in the corresponding subsequent sTTI to determine the sPDSCH reception therein.

Optionally, DCI of all sttis in a subframe (this case corresponds to that sTTI is divided from after Legacy PDCCH region), or DCI of remaining sTTI in a subframe except for the sTTI including Legacy PDCCH is detected in the first L OFDM symbols in the sTTI band. L is less than or equal to the number of symbols contained in the sTTI.

When the terminal receives and detects the sPDSCH, in an sTTI band:

If x >1, more than 1 UE is supported in one sTTI, the PDSCH channel is rate matched in REs except for sPDCCH and RS occupancy. When the sPDCCH does not independently occupy the OFDM symbol, the allocated PDSCH resource occupation is in a self-contained/embedded form if the allocated PDSCH resource occupation includes the sPDCCH resource occupation range for scheduling the sPDCCH. The DCI needs to indicate the frequency domain resource allocation of the sPDSCH. (1) Continuous or discontinuous resource allocation is used in the sTTI band, and the resource allocation comprises a region occupied by the sPDCCH;

The implicit determination mode is to determine the resource position occupied by the sPDSCH scheduled by the sPDCCH according to the resource position occupied by the sPDCCH. Specifically, the number of sPDSCH is divided according to the number of sPDCCH in the sTTI band, and frequency domain resource ranges of different sPDSCH are predefined, for example, as shown in fig. 10 (a), the search space includes 2 sPDCCH candidate sets, the sPDSCH resource occupation corresponding to each sPDCCH is predefined, for example, 1/2 of the frequency domain range of the sTTI band, and the resource occupied by the sPDSCH is the frequency domain range including the sPDCCH of the scheduling information. Or as shown in (b) or (c) of fig. 10, the candidate set occupied by the sPDCCH is a discrete PRB or REG, the resource position occupied by the scheduled sPDSCH is starting from the PRB occupied by the sPDCCH, the occupied frequency domain width is implicitly determined by allocating PRBs by the search space or indicated by the DCI, for example, the search space is configured as 2 candidate sets, and occupies 4 positions, the sPDSCH occupies the range from the starting of the PRB occupied by the sPDCCH to the starting of the PRB occupied by another candidate set, or the DCI indicates that the sPDSCH occupies the frequency domain resource size after the starting of the PRB occupied by the sPDCCH.

Meanwhile, in order to solve the problem of transmission of UL grant and DL a/N, when the search space is shared with DL grant, it is not complete self-contained, and a candidate set of UL grant and DL a/N is also reserved, that is, resources used by PDSCH are not only rate-matched to DL grant and RS scheduled for the PDSCH but also rate-matched to UL grant and DL a/N, that is, configured sPDCCH search space rate-matched, as shown in fig. 8. Or independent search spaces (such as independent PRBs) are configured for ul grant and DL a/N in sTTI, as shown in fig. 9, at this time, the downlink PDSCH is still completely self-contained, that is, the resource used by the PDSCH only rates the DL grant and RS to which the PDSCH is scheduled. Or the UL grant and the DL A/N are only transmitted in the Legacy PDCCH.

By the scheme of the embodiment, the resource overhead and the processing complexity are saved by detecting single DCI in the search space configured in the partial resource position and acquiring the resource position of the sPDSCH according to the partial DCI information.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A downlink information receiving method, comprising:

determining one or more search spaces comprising one or more physical downlink control channels (sPDCCH) for receiving downlink control information, wherein the search spaces comprise at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol;

receiving the downlink control information DCI on the one or more sPDCCHs included in the one or more determined search spaces.

2. The method of claim 1, further comprising:

determining the resource position of the traffic channel according to at least one of the allocation indication of the DCI and the resource position of the DCI, wherein the resource position comprises at least one of the following modes:

using continuous or discontinuous resource allocation in the sTTI frequency band, wherein the resource allocation comprises a region occupied by part or all of the sPDCCH;

indicating whether sPDSCH occupies all resources in the sTTI band through signaling in the sTTI band;

implicitly determining the resource position of the sPDSCH according to the resource occupied by the sPDCCH;

determining the resource position of the sPDSCH according to the resource occupation implication of the sPDCCH and combining the indication information;

wherein the implicit determination is to determine the resource location occupied by the scheduled sPDSCH from the resource location occupied by the sPDCCH.

3. The method of claim 2, wherein the implicit rule comprises at least one of:

the starting or ending sPRB where the sPDCCH is located is the same as the starting, ending or middle sPRB of the sPDSCH scheduled by the sPDCCH;

indicating the resource occupation length of the scheduled sPDSCH in the DCI;

indicating a resource starting offset value of the scheduled sPDSCH in the DCI;

multiplying the starting or ending sPRB index of the sPDCCH by the multiple or coefficient of DCI notification, RRC notification or SIB notification, and determining the starting or ending or middle sPRB of the sPDSCH scheduled by the sPRC;

multiplying the starting or ending sPRB index of the sPDCCH by a multiple or a coefficient of the predefined, DCI notification, RRC notification or SIB notification to determine the resource occupation length of the scheduled sDSCH.

4. The method of claim 2, further comprising:

and the sPDSCH performs resource mapping on the allocated resource blocks, wherein the rate matching mode during resource mapping comprises the following steps:

carrying out rate matching on the sPDCCH and the pilot frequency for scheduling the sPDSCH; or,

and carrying out rate matching on the search space where the sPDCCH for scheduling the sPDSCH is located and the pilot frequency.

5. The method of claim 1, further comprising:

the terminal detects the search space, wherein the used resource of the search space is configured by at least one of the following means: configuring partial resources in the first x OFDM symbols in the sTTI; configuring a part of short sPRB resources in the sTTI; partial resources are configured in one or more OFDM symbols.

6. The method of claim 5,

the partial resource is one of:

at least one sPRB or REG resource in a subframe;

at least one sPRB or REG resource in the sTTI;

at least one sPRB or REG resource in one or more OFDM symbols, wherein the sPRB resource comprises 12 subcarrier resource units in the frequency domain within the limited number of time domain OFDM symbols.

7. The method of claim 1, wherein the sTTI has a frequency-domain position and a time-domain length that are at least one of: a predetermined value, a predetermined pattern, a value of a higher layer signaling configuration, a value of a physical layer signaling configuration.

8. The method of claim 7, further comprising:

detecting at least one of the sPDCCH and the sPDSCH in the sTTI,

wherein, the frequency domain position of the sTTI is configured by at least one of the following modes when the higher layer signaling configuration and/or the physical layer signaling configuration is adopted: configuring one sTTI band position, configuring a plurality of sTTI band positions through SIB by adopting RRC or DCI, and indicating the plurality of sTTI band positions through DCI by adopting RRC; or,

under the condition that the time domain length of the sTTI adopts high-layer signaling configuration and/or physical layer signaling configuration, configuring the time domain length of the sTTI in at least one of the following modes: configuring a kind of sTTI length or pattern, configuring the sTTI length or pattern independently according to different sTTI bands, configuring the dynamic sTTI length, and combining the minimum sTTI length supported in the dynamic indication subframe or radio frame.

9. The method of claim 1, wherein the search space is one or more, and wherein the carried DCI message format comprises at least one of: a downlink grant DL grant, an uplink grant UL grant for ACK/NACK for transmitting a correct/wrong response message ACK/NACK, and a downlink grant DL grant for common messages for scheduling common messages.

10. The method of claim 9,

when the search space is one, the DCI message format carried by the search space includes at least one of: DL grant, UL grant for ACK/NACK, DL grant for common messages;

under the condition that the number of the search spaces is two, the DCI message format carried by one search space only includes a DL grant, and the DCI message format carried by the other search space includes at least one of the following: DL grant, UL grant for ACK/NACK, DL grant for common messages.

11. The method of claim 9,

when the search space is multiple, at least one of the multiple search spaces is located within the sTTI band.

12. The method of any one of claims 1,2, 5, 7, 9, further comprising:

when the sPDCCH is scrambled in the sTTI, the sPDCCH scrambling sequence initial value is determined by at least one of the following steps: sTTI serial number, wireless frame serial number, subframe serial number, slot number, OFDM symbol serial number, sTTI sub-band serial number, physical resource block PRB serial number.

13. A method for sending downlink information is characterized by comprising the following steps:

configuring one or more search spaces comprising one or more Physical Downlink Control Channels (PDCCHs) for receiving downlink control information, wherein the search spaces comprise at least one of the following resources: a subframe, part of resources of a short transmission time interval (sTTI), and part of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms;

and sending Downlink Control Information (DCI) to a terminal, wherein the DCI is used for the terminal to receive on the one or more PDCCHs included in one or more search spaces determined from the one or more configured search spaces.

14. The method of claim 13, wherein configuring one or more search spaces comprising one or more Physical Downlink Control Channels (PDCCHs) for receiving downlink control information comprises:

configuring the use resources of the search space by at least one of: configuring partial resources in the first x OFDM symbols in the sTTI; configuring a part of short sPRB resources in the sTTI; partial resources are configured in one or more OFDM symbols.

15. The method of claim 14, wherein the partial resource is one of:

at least one sPRB or REG resource in a subframe;

at least one sPRB or REG resource in the sTTI;

16. The method of claim 13, wherein the sTTI has a frequency-domain position and a time-domain length that are at least one of: a predetermined value, a predetermined pattern, a value of a higher layer signaling configuration, a value of a physical layer signaling configuration.

17. The method of claim 16, further comprising:

configuring the frequency domain position of the sTTI by adopting a high-layer signaling configuration and/or a physical layer signaling through at least one of the following modes:

configuring one sTTI band position, configuring a plurality of sTTI band positions through SIB by adopting RRC or DCI, and indicating the plurality of sTTI band positions through DCI by adopting RRC;

configuring the time domain length of the sTTI by adopting a higher layer signaling configuration and/or a physical layer signaling through at least one of the following modes:

configuring a kind of sTTI length or pattern, configuring the sTTI length or pattern independently according to different sTTI bands, configuring the dynamic sTTI length, and combining the minimum sTTI length supported in the dynamic indication subframe or radio frame.

18. The method of claim 13, wherein the search space is one or more, and wherein the DCI message formats carried comprise at least one of: a downlink grant DL grant, an uplink grant UL grant for ACK/NACK for transmitting a correct/wrong response message ACK/NACK, and a downlink grant DL grant for common messages for scheduling common messages.

19. The method of claim 18,

20. The method of claim 19, wherein if the search space is multiple, at least one of the multiple search spaces is located within an sTTI band.

21. A downlink information receiving apparatus, comprising:

a first determining module, configured to determine one or more search spaces including one or more physical downlink control channels, sPDCCH, for receiving downlink control information, where the search spaces include at least one of the following resources: part of resources in a subframe, part of resources in a short transmission time interval (sTTI), and part of resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms;

a receiving module, configured to receive the DCI on the one or more spdcchs included in the determined one or more search spaces.

22. A downlink information transmitting apparatus, comprising:

a first configuration module, configured to configure one or more search spaces including one or more physical downlink control channels, PDCCHs, for receiving downlink control information, wherein the search spaces include at least one of the following resources: a subframe, part of resources of a short transmission time interval (sTTI), and part of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the sTTI is a TTI with time less than 1 ms;

a sending module, configured to send downlink control information to a terminal, where the DCI is used for the terminal to receive on the one or more PDCCHs included in one or more search spaces determined from the one or more configured search spaces.