CN107154911B

CN107154911B - Configuration method and configuration device for demodulation reference signal, network side equipment and terminal

Info

Publication number: CN107154911B
Application number: CN201710588777.8A
Authority: CN
Inventors: 付婷
Original assignee: Meizu Technology Co Ltd
Current assignee: Meizu Technology Co Ltd
Priority date: 2017-07-19
Filing date: 2017-07-19
Publication date: 2020-08-07
Anticipated expiration: 2037-07-19
Also published as: CN107154911A

Abstract

The invention provides a configuration method and a configuration device for demodulation reference signals, network side equipment and a terminal, wherein the configuration method for the demodulation reference signals of the network side equipment comprises the following steps: generating an uplink scheduling signaling, wherein the uplink scheduling signaling comprises demodulation reference signal configuration information; and sending the uplink scheduling signaling to a terminal on a downlink subframe sTTI n, wherein the demodulation reference signal configuration information indicates the position of an OFDM symbol occupied by a demodulation reference signal contained in an uplink subframe sTTI (n + l) used for transmitting uplink data by the terminal. By the technical scheme of the invention, the resource overhead of the demodulation reference signal can be effectively reduced.

Description

Configuration method and configuration device for demodulation reference signal, network side equipment and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for configuring a demodulation reference signal, a network side device, and a terminal.

Background

With the development of mobile internet, a great deal of application services satisfying various specific functions are emerging, some of which have low requirements on data delay, such as sending and receiving mails, downloading movies, etc., but some other services have strict requirements on data delay, such as network online games, robbery, red packet robbery, etc., which generally require that the delay of user data is as short as possible, in L TE (L ong Term Evolution ) network, the Transmission Time Interval (TTI) is an important index affecting the user data delay, the current L TE system adopts a TTI of 1ms, i.e., one subframe, and in addition, there are 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols in the case of a common Cyclic Prefix (CP, Cyclic Prefix), and when there are 12 OFDM symbols in the case of an extended Cyclic Prefix, a transmitting end can transmit one data block every 1ms, and a receiving end can receive one data block every 1 ms.

The use of shorter TTIs in L TE networks is well established in the 3GPP (3rd Generation Partnership Project) RAN (Radio Access Network) #69 conference, and the feasibility and possible beneficial effects of using shorter TTIs (short TTIs, hereinafter sTTI) are studied, some documents such as [ R1-160942], [ R1-160930] quantitatively study the effect of the reduction of TTI duration on data delay in L TE networks, and analysis shows that the use of sTTI does not only shorten the transmission time interval of the base station and the terminal, and correspondingly, the data processing time corresponding to the transmission time interval also decreases, e.g. both data coding modulation and data demodulation time decrease with decreasing data block size, at present, a possible sTTI duration setting comprises 2 or 3 OFDM symbols, i.e. s0 and s5 subframes respectively comprise 3 OFDM symbols, and s1 and 2 subframes respectively comprise 2 TTIs 2 subframes.

In the RAN 1#88b conference, the design of DMRS (Demodulation Reference Signal) in sTTI is proposed to determine the location configuration of DMRS of uplink sTTI (n + x) subframe by sending uplink scheduling command U L (Up L ink) grant in sTTI n subframe, where the specific value of x is related to the scheduling timing and if applied to TDD (Time Division Duplexing) uplink and downlink configuration.

sTTI#n+x＝sTTI#0:{R D D}，FFS:{D D R}，FFS:{D R D}

sTTI#n+x＝sTTI#1，2，3，4:{R D}，FFS:{D R}

sTTI#n+x＝sTTI#5:{R D D}，FFS:{D R D}

Wherein FFS represents a bit arithmetic function, D represents a data symbol, and R represents a DMRS symbol. Each sTTI subframe contains one DMRS symbol. It can be seen that the overhead of pilot symbols is large in the above DMRS location configuration, and the resource accounts for 43%, which is much higher than 14% of DMRS in 1ms TTI. Therefore, how to effectively reduce the resource overhead of the DMRS becomes an urgent technical problem to be solved.

Disclosure of Invention

The invention is based on the above problems, and provides a new technical scheme, and each subframe sTTI has a plurality of selectable demodulation reference signal configuration options, so that the base station can flexibly configure the position of the demodulation reference signal through uplink scheduling signaling, and the resource overhead of the demodulation reference signal is effectively reduced.

In view of this, according to a first aspect of the present invention, a method for configuring a demodulation reference signal is provided, which is applied to a network side device using sTTI, and the method for configuring a demodulation reference signal includes: generating an uplink scheduling signaling, wherein the uplink scheduling signaling comprises demodulation reference signal configuration information; and sending the uplink scheduling signaling to a terminal on a downlink subframe sTTI n, wherein the demodulation reference signal configuration information indicates the position of an OFDM symbol occupied by a demodulation reference signal contained in an uplink subframe sTTI (n + l) used for transmitting uplink data by the terminal.

In the technical scheme, the network side device may indicate the position of the OFDM symbol occupied by the demodulation reference signal (i.e., DMRS) in the uplink subframe sTTI (n + l) of the terminal for transmitting uplink data in a manner of configuring the demodulation reference signal configuration information in the uplink scheduling signaling sent to the terminal on the downlink subframe sTTI n, so as to flexibly configure the position of the demodulation reference signal through the uplink scheduling signaling, thereby achieving the purpose of effectively reducing the resource overhead of the demodulation reference signal, and thus, the network side device may perform uplink control and demodulation of the data channel by using the demodulation reference signal in the corresponding uplink subframe sTTI (n + l).

Specifically, preset bits may be used to indicate the demodulation reference signal configuration information in the uplink scheduling signaling, for example, two bits are used.

In the foregoing technical solution, preferably, the step of generating the uplink scheduling signaling specifically includes: when the uplink channel is a fast time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by demodulation reference signals contained in the uplink subframe sTTI (n + l) is a first value greater than 0; when the uplink channel is a slow time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, wherein the second value is less than or equal to the first value.

In the technical scheme, when the position of the demodulation reference signal is flexibly configured through the uplink scheduling signaling, the time-varying characteristic of the uplink channel can be further combined, that is, the demodulation reference signal configuration information contained in the uplink scheduling signaling is set according to the time-varying characteristic of the current uplink channel, specifically, when the uplink channel is a fast time-varying channel and the instantaneous variation is high, the demodulation reference signal configuration information selected for each uplink subframe is used for indicating that the uplink channel can contain more demodulation reference signal positions, because the time variation of the uplink channel is high, the uplink channel corresponding to a plurality of uplink subframes sTTI adjacent in a time domain has large variation, and therefore more demodulation reference signal positions are required to be used for channel estimation, so as to ensure the error rate of data demodulation; when the uplink channel is a slow time-varying channel and the time variation is low, the demodulation reference signal configuration information selected for each uplink subframe is used for indicating that the uplink channel can contain fewer demodulation reference signal positions, because the time variation of the uplink channel is low, the uplink channels corresponding to a plurality of uplink subframes sTTI adjacent in a time domain will not change greatly, and thus fewer demodulation reference signal positions can provide better channel estimation results and meet the requirement of data demodulation near the demodulation reference signal positions.

The number of OFDM symbols occupied by demodulation reference signals included in an uplink subframe corresponding to a fast time-varying channel is greater than or equal to the number of OFDM symbols occupied by demodulation reference signals included in an uplink subframe corresponding to a slow time-varying channel, that is, the number of OFDM symbols occupied by demodulation reference signals included in an uplink subframe corresponding to a slow time-varying channel may be 0, and the number of OFDM symbols occupied by demodulation reference signals included in an uplink subframe corresponding to a fast time-varying channel should be at least one.

In any of the above technical solutions, preferably, in a system operating in FDD mode, the time-varying characteristic of the current uplink channel is determined according to a result of performing uplink channel estimation on a demodulation reference signal received from the terminal on an uplink subframe within a preset time window before the uplink scheduling signaling is sent; in a system adopting TDD mode to work, determining the time-varying characteristic of the current uplink channel according to the downlink channel state information received from the terminal in a preset time window before the uplink scheduling signaling is sent and the result of uplink channel estimation according to the demodulation reference signal received from the terminal sent on an uplink subframe.

In the technical scheme, different manners can be adopted for estimating the uplink channel for mobile communication systems adopting different working modes, so that the accuracy of the result of the uplink channel estimation is effectively ensured, and the time-varying characteristic of the uplink channel can be accurately determined, specifically, in a system adopting an FDD (Frequency Division duplex) mode for working, the time-varying degree of the uplink channel can be determined by comparing the channel conditions corresponding to the uplink subframe within a period of time, that is, within a period of time window before the uplink scheduling signaling is sent to the terminal, the time-varying degree of the uplink channel within the period of time window is determined according to the result of the channel estimation performed by the demodulation reference signal sent by the terminal on the uplink subframe, so as to determine the time-varying degree of the uplink channel; in a system operating in a TDD mode, reciprocity of uplink and downlink channels may be used to compare channel conditions corresponding to a downlink subframe and an uplink subframe within a time window, that is, within a time window before an uplink scheduling signaling is sent to a terminal, a change condition of an uplink channel within the time window is determined according to downlink channel state information reported by the terminal and a result of channel estimation performed on a demodulation reference signal sent by the terminal on the uplink subframe to determine a time-varying degree of the uplink channel, where the terminal may perform channel estimation on the downlink channel corresponding to the downlink subframe according to a received CRS (Cell-Specific reference signal/common reference signal).

According to a second aspect of the present invention, a device for configuring a demodulation reference signal is provided, which is suitable for a network side device using sTTI, and the device for configuring a demodulation reference signal includes: a generating module, configured to generate an uplink scheduling signaling, where the uplink scheduling signaling includes demodulation reference signal configuration information; a sending module, configured to send the uplink scheduling signaling generated by the generating module to a terminal on a downlink subframe sTTI n, where the demodulation reference signal configuration information indicates a position of an OFDM symbol occupied by a demodulation reference signal included in an uplink subframe sTTI (n + l) used by the terminal to transmit uplink data.

In the foregoing technical solution, preferably, the generating module is specifically configured to: when the uplink channel is a fast time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by demodulation reference signals contained in the uplink subframe sTTI (n + l) is a first value greater than 0; when the uplink channel is a slow time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, wherein the second value is less than or equal to the first value.

In any one of the above technical solutions, preferably, the apparatus for configuring a demodulation reference signal further includes: a determination module to: in a system working in an FDD mode, determining the time-varying characteristic of the current uplink channel according to the result of uplink channel estimation of a demodulation reference signal received from the terminal in a preset time window before the uplink scheduling signaling is sent; in a system adopting TDD mode to work, determining the time-varying characteristic of the current uplink channel according to the downlink channel state information received from the terminal in a preset time window before the uplink scheduling signaling is sent and the result of uplink channel estimation according to the demodulation reference signal received from the terminal sent on an uplink subframe.

In the technical scheme, different modes can be adopted for estimating the uplink channel aiming at mobile communication systems adopting different working modes, so that the accuracy of the result of the uplink channel estimation is effectively ensured, and the time-varying characteristic of the uplink channel can be accurately determined; in a system adopting the TDD mode for operation, the reciprocity of uplink and downlink channels can be used to compare channel conditions corresponding to a downlink subframe and an uplink subframe within a time window, that is, within a time window before an uplink scheduling signaling is sent to a terminal, the time variation of the uplink channel is determined according to the downlink channel state information reported by the terminal and the result of channel estimation performed on a demodulation reference signal sent by the terminal in the uplink subframe to determine the time variation of the uplink channel, wherein the terminal can perform channel estimation on the downlink channel corresponding to the downlink subframe according to the received CRS.

According to a third aspect of the present invention, a network side device is provided, including: as mentioned in any of the above technical solutions of the second aspect, therefore, the network side device has all the beneficial effects of the above technical solution, and is not described herein again.

According to a fourth aspect of the present invention, a method for configuring a demodulation reference signal is provided, which is applied to a terminal using sTTI, and the method for configuring a demodulation reference signal includes: receiving an uplink scheduling signaling sent by network side equipment on a downlink subframe sTTI n; acquiring demodulation reference signal configuration information contained in the uplink scheduling signaling; and when uplink data is sent to the network side equipment on an uplink subframe sTTI (n + l), setting the position of the OFDM symbol occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) according to the demodulation reference signal configuration information.

In the technical scheme, the position of the demodulation reference signal is flexibly configured through the uplink scheduling signaling by acquiring the demodulation reference signal configuration information contained in the uplink scheduling signaling sent by the network side equipment on the downlink subframe sTTI n and setting the position of an OFDM symbol occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) used for sending the uplink data to the network side equipment according to the demodulation reference signal configuration information, so that the aim of effectively reducing the resource overhead of the demodulation reference signal is fulfilled, and the uplink control and the demodulation of a data channel can be carried out by using the demodulation reference signal in the corresponding uplink subframe sTTI (n + l).

Specifically, in the uplink scheduling signaling, a preset bit may be used to indicate the demodulation reference signal configuration information, for example, two bits are used.

In the above technical solution, preferably, the demodulation reference signal configuration information is set by the network side device according to a time-varying characteristic of a current uplink channel; and when the uplink channel is a fast time-varying channel, the demodulation reference signal configuration information is used to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is a first value greater than 0; when the uplink channel is a slowly time-varying channel, the demodulation reference signal configuration information is used to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, where the second value is less than or equal to the first value.

In the technical scheme, when the position of the demodulation reference signal is flexibly configured through the uplink scheduling signaling, time-varying characteristics of an uplink channel can be further combined, that is, demodulation reference signal configuration information is set for network side equipment according to the time-varying characteristics of the current uplink channel, specifically, when the uplink channel is a fast time-varying channel and instantaneous variation is high, the demodulation reference signal configuration information selected for each uplink subframe is used for indicating that the uplink channel can contain more demodulation reference signal positions, because the time-varying characteristic of the uplink channel is high, the uplink channel variation corresponding to a plurality of uplink subframes sTTI adjacent in a time domain is large, and therefore more demodulation reference signal positions are required to be used for channel estimation, so as to ensure the error rate of data demodulation; when the uplink channel is a slow time-varying channel and the time variation is low, the demodulation reference signal configuration information selected for each uplink subframe is used for indicating that the uplink channel can contain fewer demodulation reference signal positions, because the time variation of the uplink channel is low, the uplink channels corresponding to a plurality of uplink subframes sTTI adjacent in a time domain will not change greatly, and thus fewer demodulation reference signal positions can provide better channel estimation results and meet the requirement of data demodulation near the demodulation reference signal positions.

According to a fifth aspect of the present invention, a terminal is provided, which includes: the transceiver is used for receiving an uplink scheduling signaling sent by the network side equipment on a downlink subframe sTTI n; a processor and a memory, the processor being configured to implement the following when executing a computer program stored in the memory: acquiring demodulation reference signal configuration information contained in the uplink scheduling signaling; and when uplink data is sent to the network side equipment on an uplink subframe sTTI (n + l), setting the position of the OFDM symbol occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) according to the demodulation reference signal configuration information.

In the technical scheme of the invention, each subframe sTTI has a plurality of selectable demodulation reference signal configuration options, so that the base station can flexibly configure the position of the demodulation reference signal through the uplink scheduling signaling, and the resource overhead of the demodulation reference signal is effectively reduced.

Drawings

Fig. 1 is a flowchart illustrating a method for configuring a demodulation reference signal applied to a network side device according to an embodiment of the present invention;

fig. 2 is a schematic block diagram of a configuration apparatus for demodulating reference signals applied to a network side device according to an embodiment of the present invention;

FIG. 3 shows a schematic block diagram of a network side device of an embodiment of the invention;

fig. 4 is a flowchart illustrating a method for configuring a demodulation reference signal applied to a terminal according to an embodiment of the present invention;

fig. 5 shows a schematic block diagram of a terminal of an embodiment of the invention.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Fig. 1 is a flowchart illustrating a method for configuring a demodulation reference signal applied to a network side device according to an embodiment of the present invention.

As shown in fig. 1, the method for configuring demodulation reference signals according to the embodiment of the present invention is applicable to a network side device using sTTI, and the method for configuring demodulation reference signals specifically includes the following steps:

step 102, generating an uplink scheduling signaling, wherein the uplink scheduling signaling includes demodulation reference signal configuration information.

And 104, sending the uplink scheduling signaling to the terminal on a downlink subframe sTTI n, wherein the demodulation reference signal configuration information indicates the position of an OFDM symbol occupied by a demodulation reference signal contained in an uplink subframe sTTI (n + l) used for transmitting uplink data by the terminal.

In this embodiment, the network side device may indicate, in a manner of configuring demodulation reference signal configuration information in an uplink scheduling signaling sent to the terminal on the downlink subframe sTTI n, a position of an OFDM symbol occupied by a demodulation reference signal (i.e., a DMRS) in an uplink subframe sTTI (n + l) of the terminal for transmitting uplink data, so as to flexibly configure the position of the demodulation reference signal through the uplink scheduling signaling, and achieve the purpose of effectively reducing resource overhead of the demodulation reference signal, so that the demodulation reference signal in the corresponding uplink subframe sTTI (n + l) may be used to perform uplink control and demodulation of a data channel.

The value of n can be specifically determined according to the number of OFDM symbols included in each subframe sTTI, and the value of l can be determined according to a scheduling timing sequence and the like; and the network side device may comprise a base station and/or a base station control device.

Further, in the above embodiment, the step 102 may be specifically executed as: when the uplink channel is a fast time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by demodulation reference signals contained in the uplink subframe sTTI (n + l) is a first value greater than 0; when the uplink channel is a slow time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, wherein the second value is less than or equal to the first value.

In this embodiment, when the position of the demodulation reference signal is flexibly configured through the uplink scheduling signaling, the time-varying characteristic of the uplink channel may be further combined, that is, the demodulation reference signal configuration information included in the uplink scheduling signaling is set according to the time-varying characteristic of the current uplink channel, specifically, when the uplink channel is a fast time-varying channel and the instantaneous variation is high, the demodulation reference signal configuration information selected for each uplink subframe is used to indicate that the uplink channel may include more demodulation reference signal positions, which is because the time-varying characteristic of the uplink channel is high, and the uplink channel variation corresponding to several uplink subframes sTTI adjacent in the time domain is large, so that more demodulation reference signal positions need to be used for channel estimation to ensure the error rate of data demodulation; when the uplink channel is a slow time-varying channel and the time variation is low, the demodulation reference signal configuration information selected for each uplink subframe is used for indicating that the uplink channel can contain fewer demodulation reference signal positions, because the time variation of the uplink channel is low, the uplink channels corresponding to a plurality of uplink subframes sTTI adjacent in a time domain will not change greatly, and thus fewer demodulation reference signal positions can provide better channel estimation results and meet the requirement of data demodulation near the demodulation reference signal positions.

For example, in a specific embodiment, the duration of the subframe sTTI is set to 2/3 OFDM symbols, that is: the sub-frame sTTI0 and the sub-frame sTTI 5 each include 3 OFDM symbols, and the sub-frame sTTI 1, the sub-frame sTTI 2, the sub-frame sTTI 3, and the sub-frame sTTI4 each include 2 OFDM symbols.

Further, for subframe sTTI0 and subframe sTTI 5, possible DMRS configurations are { (D), (R D), (DD R) }; possible DMRS configurations are { (D D), (R D), (D R) } for subframe sTTI 1, subframe sTTI 2, subframe sTTI 3, and subframe sTTI 4. That is, DMRSs may or may not be included in each sTTI, and there are various DMRS location configuration options.

And when the network side equipment is according to the principle: when the time-varying property of the uplink channel is low, the DMRS configuration selected for each subframe sTTI may include fewer DMRS positions, and when the time-varying property of the uplink channel is high, the DMRS configuration selected for each subframe sTTI may include more DMRS positions, and when the DMRS configuration is indicated, a specific configuration case is as follows:

when the time-varying property of the uplink channel is low, the DMRS configuration refers to table 1 below, where uplink data of the subframe sTTI0, the subframe sTTI 1, and the subframe sTTI 2 are all demodulated using the DMRS pilot in the subframe sTTI0, and uplink data of the subframe sTTI 3, the subframe sTTI4, and the subframe sTTI 5 are all demodulated using the DMRS pilot in the subframe sTTI 3. Due to the fact that the time variation of the channel is low, the channel corresponding to a plurality of adjacent subframes sTTI in the time domain will not change greatly, and therefore fewer pilot positions can provide a good channel estimation effect for data demodulation near the pilot positions.

TABLE 1

sTTI 0	sTTI 1	sTTI 2	sTTI 3	sTTI 4	sTTI 5
						(R D D)	(D D)	(D D)	(R D)	(D D)	(D D D)

When the time-varying property of the uplink channel is high, the DMRS configuration refers to table 2 below, where each subframe sTTI includes a DMRS, and data information of each subframe sTTI is demodulated using a DMRS pilot in this sTTI. Because the time-varying property of the channel is higher, the channel variation corresponding to a plurality of adjacent sTTI in the time domain is larger, and thus more DMRSs are needed to perform channel estimation, and the error rate of data demodulation is ensured.

TABLE 2

sTTI 0	sTTI 1	sTTI 2	sTTI 3	sTTI 4	sTTI 5
						(R D D)	(R D)	(R D)	(R D)	(R D)	(R D D)

Further, in the above embodiment, in a system operating in FDD mode, the time-varying characteristic of the current uplink channel is determined according to a result of performing uplink channel estimation on a demodulation reference signal received from the terminal on an uplink subframe within a preset time window before the uplink scheduling signaling is sent; in a system adopting TDD mode to work, determining the time-varying characteristic of the current uplink channel according to the downlink channel state information received from the terminal in a preset time window before the uplink scheduling signaling is sent and the result of uplink channel estimation according to the demodulation reference signal received from the terminal sent on an uplink subframe.

In this embodiment, different manners may be adopted for estimating the uplink channel for mobile communication systems adopting different operating modes, so as to effectively ensure the accuracy of the result of the uplink channel estimation, and further accurately determine the time-varying characteristic of the uplink channel, specifically, in a system adopting an FDD mode, the level of the uplink channel time-varying property may be determined by comparing channel conditions corresponding to uplink subframes within a period of time, that is, within a period of time window before an uplink scheduling signaling is sent to a terminal, the level of the uplink channel time-varying property is determined by determining the variation condition of the uplink channel within the period of time window according to the result of channel estimation performed by a demodulation reference signal sent by the terminal in the uplink subframe; in a system adopting the TDD mode for operation, the reciprocity of uplink and downlink channels can be used to compare channel conditions corresponding to a downlink subframe and an uplink subframe within a time window, that is, within a time window before an uplink scheduling signaling is sent to a terminal, the time variation of the uplink channel is determined according to the downlink channel state information reported by the terminal and the result of channel estimation performed on a demodulation reference signal sent by the terminal in the uplink subframe to determine the time variation of the uplink channel, wherein the terminal can perform channel estimation on the downlink channel corresponding to the downlink subframe according to the received CRS.

Fig. 2 shows a schematic block diagram of a configuration apparatus for demodulating reference signals applied to a network side device according to an embodiment of the present invention.

As shown in fig. 2, the apparatus 20 for configuring demodulation reference signals according to the embodiment of the present invention is suitable for a network side device using sTTI, and the apparatus 20 for configuring demodulation reference signals includes: a generation module 202 and a sending module 204.

The generating module 202 is configured to generate an uplink scheduling signaling, where the uplink scheduling signaling includes demodulation reference signal configuration information; the sending module 204 is configured to send the uplink scheduling signaling generated by the generating module 202 to the terminal on a downlink subframe sTTI n, where the demodulation reference signal configuration information indicates a position of an OFDM symbol occupied by a demodulation reference signal included in an uplink subframe sTTI (n + l) used by the terminal to transmit uplink data.

Further, the value of n may be specifically determined according to the number of OFDM symbols included in each subframe sTTI, and the value of l may be determined according to a scheduling timing sequence, etc.; and the network side device may comprise a base station and/or a base station control device.

Further, in the foregoing embodiment, the generating module 202 is specifically configured to: when the uplink channel is a fast time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by demodulation reference signals contained in the uplink subframe sTTI (n + l) is a first value greater than 0; when the uplink channel is a slow time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, wherein the second value is less than or equal to the first value.

TABLE 1

TABLE 2

Further, in the foregoing embodiment, as shown in fig. 2, the apparatus for configuring a demodulation reference signal further includes: a determination module 206, the determination module 206 to: in a system working in an FDD mode, determining the time-varying characteristic of the current uplink channel according to the result of uplink channel estimation of a demodulation reference signal received from the terminal in a preset time window before the uplink scheduling signaling is sent; in a system adopting TDD mode to work, determining the time-varying characteristic of the current uplink channel according to the downlink channel state information received from the terminal in a preset time window before the uplink scheduling signaling is sent and the result of uplink channel estimation according to the demodulation reference signal received from the terminal sent on an uplink subframe.

Fig. 3 shows a schematic block diagram of a network side device of an embodiment of the invention.

As shown in fig. 3, the network side device 30 according to the embodiment of the present invention includes the apparatus 20 for configuring a demodulation reference signal according to any one of the embodiments of the second aspect, so that the network side device 30 has all the beneficial effects of the apparatus 20 for configuring a demodulation reference signal according to any one of the embodiments, and is not described herein again. The network side device 30 may include a base station and/or a base station control device.

Fig. 4 is a flowchart illustrating a method for configuring a demodulation reference signal applied to a terminal according to an embodiment of the present invention.

As shown in fig. 4, the method for configuring demodulation reference signals according to the embodiment of the present invention is applicable to a terminal using sTTI, and the method for configuring demodulation reference signals specifically includes the following steps:

step 402, receiving an uplink scheduling signaling sent by a network side device on a downlink subframe sTTI n.

Step 404, obtaining demodulation reference signal configuration information contained in the uplink scheduling signaling.

Step 406, when sending uplink data to the network side device in the uplink subframe sTTI (n + l), setting the position of the occupied OFDM symbol of the demodulation reference signal included in the uplink subframe sTTI (n + l) according to the demodulation reference signal configuration information.

In this embodiment, by obtaining the demodulation reference signal configuration information included in the uplink scheduling signaling sent by the network side device on the downlink subframe sTTI n, and setting the position of the OFDM symbol occupied by the demodulation reference signal included in the uplink subframe sTTI (n + l) used for sending uplink data to the network side device according to the demodulation reference signal configuration information, the position of the demodulation reference signal is flexibly configured through the uplink scheduling signaling, and the purpose of effectively reducing the resource overhead of the demodulation reference signal is achieved, so that the demodulation reference signal in the corresponding uplink subframe sTTI (n + l) can be used for uplink control and demodulation of the data channel.

Further, in the above embodiment, the demodulation reference signal configuration information is set by the network side device according to a time-varying characteristic of a current uplink channel; and when the uplink channel is a fast time-varying channel, the demodulation reference signal configuration information is used to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is a first value greater than 0; when the uplink channel is a slowly time-varying channel, the demodulation reference signal configuration information is used to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, where the second value is less than or equal to the first value.

In this embodiment, when the position of the demodulation reference signal is flexibly configured through the uplink scheduling signaling, time-varying characteristics of an uplink channel may be further combined, that is, demodulation reference signal configuration information is set by the network side device according to time-varying characteristics of a current uplink channel, specifically, when the uplink channel is a fast time-varying channel and instantaneous degeneration is high, the demodulation reference signal configuration information selected for each uplink subframe is used to indicate that the uplink channel may contain more demodulation reference signal positions, which is because the time-varying property of the uplink channel is high, and uplink channels corresponding to several uplink subframes sTTI adjacent in a time domain have large variation, so that more demodulation reference signal positions need to be used for channel estimation to ensure an error rate of data demodulation; when the uplink channel is a slow time-varying channel and the time variation is low, the demodulation reference signal configuration information selected for each uplink subframe is used for indicating that the uplink channel can contain fewer demodulation reference signal positions, because the time variation of the uplink channel is low, the uplink channels corresponding to a plurality of uplink subframes sTTI adjacent in a time domain will not change greatly, and thus fewer demodulation reference signal positions can provide better channel estimation results and meet the requirement of data demodulation near the demodulation reference signal positions.

As shown in fig. 5, according to the terminal 50 of the embodiment of the present invention, the terminal 50 includes: a transceiver 502, a processor 504, and a memory 506.

The transceiver 502 is configured to receive an uplink scheduling signaling sent by a network side device on a downlink subframe sTTI n; the processor 504, when executing the computer program stored in the memory 506, is configured to: acquiring demodulation reference signal configuration information contained in the uplink scheduling signaling; and when uplink data is sent to the network side equipment on an uplink subframe sTTI (n + l), setting the position of the OFDM symbol occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) according to the demodulation reference signal configuration information.

Further, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable storage medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

The technical solution of the present invention is described in detail with reference to the drawings, in the technical solution of the present invention, each subframe sTTI has multiple selectable demodulation reference signal configuration options, so that a base station can flexibly configure the position of a demodulation reference signal through an uplink scheduling signaling, so as to effectively reduce the resource overhead of the demodulation reference signal.

In the description of the present specification, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and specific meanings of the above terms in the disclosed embodiments may be understood according to specific situations by those of ordinary skill in the art.

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 method for configuring a demodulation reference signal is applicable to a network side device using an sTTI, and is characterized in that the method for configuring the demodulation reference signal comprises the following steps:

generating an uplink scheduling signaling, wherein the uplink scheduling signaling comprises demodulation reference signal configuration information;

sending the uplink scheduling signaling to a terminal on a downlink subframe sTTIn, wherein the demodulation reference signal configuration information indicates the position of an OFDM symbol occupied by a demodulation reference signal contained in an uplink subframe sTTI (n + l) used for transmitting uplink data by the terminal;

the step of generating the uplink scheduling signaling specifically includes:

when an uplink channel is a fast time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by demodulation reference signals contained in the uplink subframe sTTI (n + l) is a first value greater than 0;

when the uplink channel is a slow time-varying channel, setting the demodulation reference signal configuration information to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, wherein the second value is less than or equal to the first value.

2. The method of configuring demodulation reference signals according to claim 1,

in a system working in an FDD mode, determining the time-varying characteristic of a current uplink channel according to the result of uplink channel estimation of a demodulation reference signal received from the terminal on an uplink subframe in a preset time window before the uplink scheduling signaling is sent;

in a system adopting TDD mode to work, determining the time-varying characteristic of the current uplink channel according to the downlink channel state information received from the terminal in a preset time window before the uplink scheduling signaling is sent and the result of uplink channel estimation according to the demodulation reference signal received from the terminal sent on an uplink subframe.

3. A method for configuring a demodulation reference signal (DM) is applicable to a terminal using an sTTI, and the method for configuring the DM reference signal comprises the following steps:

receiving an uplink scheduling signaling sent by a network side device on a downlink subframe sTTIn;

acquiring demodulation reference signal configuration information contained in the uplink scheduling signaling;

when uplink data are sent to the network side equipment on an uplink subframe sTTI (n + l), setting the position of an OFDM symbol occupied by a demodulation reference signal contained in the uplink subframe sTTI (n + l) according to the demodulation reference signal configuration information;

the demodulation reference signal configuration information is set for the network side equipment according to the time-varying characteristic of the current uplink channel; and

when the uplink channel is a fast time-varying channel, the demodulation reference signal configuration information is used to indicate that the number of OFDM symbols occupied by a demodulation reference signal contained in the uplink subframe sTTI (n + l) is a first value greater than 0;

when the uplink channel is a slowly time-varying channel, the demodulation reference signal configuration information is used to indicate that the number of OFDM symbols occupied by the demodulation reference signal contained in the uplink subframe sTTI (n + l) is 0 or a second value greater than 0, where the second value is less than or equal to the first value.

4. A device for configuring a demodulation reference signal, which is applicable to a network side device using an sTTI, is characterized in that the device for configuring the demodulation reference signal comprises:

a generating module, configured to generate an uplink scheduling signaling, where the uplink scheduling signaling includes demodulation reference signal configuration information;

a sending module, configured to send the uplink scheduling signaling generated by the generating module to a terminal on a downlink subframe sTTIn, where the demodulation reference signal configuration information indicates a position of an OFDM symbol occupied by a demodulation reference signal included in an uplink subframe sTTI (n + l) used by the terminal to transmit uplink data;

the generation module is specifically configured to:

5. The apparatus for configuring demodulation reference signals according to claim 4, further comprising a determining module, said determining module is configured to:

6. A network-side device, comprising: the apparatus for configuring demodulation reference signals according to claim 4 or 5.

7. A terminal, characterized in that the terminal comprises:

the transceiver is used for receiving an uplink scheduling signaling sent by the network side equipment on a downlink subframe sTTIn;

a processor and a memory, the processor being configured to implement the following when executing a computer program stored in the memory: