CN106411805B

CN106411805B - Method for sending synchronous signal of unauthorized carrier and base station

Info

Publication number: CN106411805B
Application number: CN201510449433.XA
Authority: CN
Inventors: 赵亚军; 徐汉青; 莫林梅
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-07-28
Filing date: 2015-07-28
Publication date: 2020-06-16
Anticipated expiration: 2035-07-28
Also published as: WO2017016216A1; CN106411805A

Abstract

The embodiment of the invention discloses a method for sending a synchronous signal of an unauthorized carrier and a base station, wherein the method comprises the following steps: a base station configures a Discovery Reference Signal (DRS) transmission pattern; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain positions, composition parameters; transmitting the DRS based on a configured DRS transmission pattern such that the DRS has periodicity and/or persistence, or aperiodic and/or persistence.

Description

Method for sending synchronous signal of unauthorized carrier and base station

Technical Field

The invention relates to a wireless communication technology, in particular to a method for sending a synchronization signal of an unauthorized carrier and a base station.

Background

The Long Term Evolution (LTE) -Unlicensed carrier used in LTE-U refers to the deployment of LTE in Unlicensed carriers, which is used to meet the increasing capacity requirement of a wireless communication system and improve the usage efficiency of Unlicensed spectrum, and is an important Evolution direction for LTE and future wireless communication. When designing an LTE-U, how to perform data transmission with heterogeneous systems such as Wireless Fidelity (WiFi), radar, and fair and friendly contention for unlicensed carriers between the same LTE-U system needs to be considered, and LTE technical characteristics need not to be affected and retained as much as possible.

For a communication system using an unlicensed carrier, it is necessary to avoid using an unlicensed carrier that is already being used by a station in the unlicensed carrier, which would otherwise cause intersystem interference. So as an implementation, it is mandatory for unlicensed carriers to support Listen Before Talk (LBT) functionality. Before using a certain unlicensed carrier, a Clear Channel Assessment (CCA) function needs to be performed, and if a device is found to be using the unlicensed carrier, or if the detected signal energy exceeds a CCA threshold, access is delayed. And if the channel is found to be idle or the detected signal energy is lower than the CCA threshold, occupying the unlicensed carrier.

The use of unlicensed carriers requires solving the problems of cell discovery and synchronization. A Discovery Reference Signal (DRS) in the prior art may be used for cell Discovery or synchronization of a common authorized carrier; wherein, DRS includes Primary Synchronization Signal/secondary Synchronization Signal (PSS/SSS), Channel State indication Reference Signal (CSI-RS), and common Reference Signal (CRS, Cell-specific Reference Signals). For the unlicensed carrier, the feature of opportunistic occupation and the requirement of continuous occupation, the DRS in the prior art cannot meet the requirement of the unlicensed carrier due to the properties of periodic transmission and scattered transmission. How to design the DRS of the unlicensed carrier to meet the characteristics of opportunistic occupation and the requirement of continuous occupation is a problem that must be solved.

Disclosure of Invention

In order to solve the existing technical problem, embodiments of the present invention provide a method and a base station for sending a synchronization signal of an unlicensed carrier, which can implement sending of the synchronization signal of the unlicensed carrier.

In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:

the embodiment of the invention provides a method for sending a synchronous signal of an unauthorized carrier, which comprises the following steps:

a base station configures a DRS transmission pattern; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain positions, composition parameters;

transmitting the DRS based on a configured DRS transmission pattern such that the DRS has periodicity and/or persistence, or aperiodic and/or persistence.

In the foregoing scheme, the configuring the DRS transmission pattern includes: when the DRS is positioned in the first half frame of a wireless frame, configuring the DRS to be formed by adopting a reference signal structure based on a first preset subframe; and/or configuring the DRS to be formed by a reference signal structure based on a second preset subframe when the DRS is positioned in the second half frame of the wireless frame.

In the foregoing scheme, the configuring the DRS transmission pattern includes: configuring DRS in DRS time window; the DRS time window has a preconfigured time domain location and time domain length.

In the foregoing scheme, the configuring the DRS transmission pattern includes: when the starting subframe occupied by the DRS is an odd subframe or an even subframe, adopting a configuration mode corresponding to the odd subframe or the even subframe;

wherein, the configuration mode corresponding to the odd subframe or the even subframe comprises: mapping a starting subframe occupied by the DRS according to a PSS/SSS corresponding to the parity of the starting subframe;

and/or, when the DRS is composed of at least two subframes, configuring the DRS by taking an odd subframe or an even subframe as a starting subframe;

and/or respectively configuring DRS structures of odd subframes and even subframes; the DRS is comprised of at least one DRS structure.

In the foregoing scheme, the configuring the DRS transmission pattern includes: when a starting Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by the DRS is configured to be an odd symbol or an even symbol, a sending mode corresponding to the odd symbol or the even symbol is adopted;

wherein, the sending mode corresponding to the odd symbol or the even symbol comprises: the parity of the initial OFDM symbols occupied by the DRS is different and is mapped according to the PSS/SSS corresponding to the parity of the initial OFDM symbols;

and/or, when the DRS is composed of at least two OFDM symbols, configuring the DRS by taking an odd OFDM symbol or an even OFDM symbol as a starting position;

and/or, respectively configuring DRS structures of odd OFDM symbols and even OFDM symbols; the DRS is formed of a DRS structure of at least one OFDM symbol.

In the foregoing scheme, the configuring the DRS transmission pattern includes: the DRS and/or the reserved signal are configured according to a preset rule;

the DRS and/or the reservation signal are configured according to a preset rule, including:

when a first condition is met, only the DRS is included in the configured DRS transmission pattern;

or when a second condition is met, the configured DRS transmission pattern includes a DRS and a reservation signal; wherein the DRS and the reservation signal are respectively independent signals;

or, when a third condition is met, the configured DRS transmission pattern includes a DRS and a reservation signal; wherein the reservation signal is a constituent of the DRS.

In the foregoing scheme, the configuring the DRS transmission pattern includes: configuring a DRS to occupy the system bandwidth on a frequency domain according to a first preset configuration mode;

wherein, configuring the DRS according to the first preset configuration mode to occupy the system bandwidth in the frequency domain includes:

configuring a system bandwidth DRS frequency domain pattern according to a preset unit DRS frequency domain pattern; or,

respectively configuring DRS frequency domains for different bandwidths according to preset rules; or,

configuring a conventional PSS/SSS structure in a preset Resource Block (RB) of a frequency domain middle frequency band, and configuring other signals in RBs on two sides of the preset RB according to a preset configuration mode.

In the foregoing scheme, the configuring the DRS transmission pattern includes: configuring the DRS and user data to be transmitted at the same time or different times according to a second preset mode;

wherein, configuring the DRS and the user data to be transmitted simultaneously or non-simultaneously according to a second preset mode includes:

when a DRS transmission pattern in a first preset time domain is consistent with a DRS transmission pattern in a second preset time domain, configuring the DRS to transmit with user data at the same time or at different times; or,

and when the DRS transmission pattern in the first preset time domain is inconsistent with the DRS transmission pattern in the second preset time domain, configuring the DRS to transmit simultaneously or not with the user data.

In the foregoing scheme, the configuring the DRS transmission pattern includes: configuring the DRS as a periodic or aperiodic transmission mode;

wherein the configuring the DRS as a periodic transmission mode includes: the DRS transmission pattern is in a static or semi-static configuration; the semi-static configuration represents that the DRS transmission pattern does not change in a preset period;

the configuring the DRS in an aperiodic transmission manner includes: DRS sends dynamic configuration of pattern, the DRS is triggered based on dynamic signaling.

In the foregoing scheme, the configuring the DRS transmission pattern includes: configuring Sounding Reference Signal (SRS) to accompany DRS transmission;

the configuring SRS to accompany DRS transmission includes:

configuring the SRS and DRS of a serving cell in which the UE is located to transmit concomitantly; or,

configuring aperiodic DRS (DRS) accompanying transmission of an SRS and a serving cell in which the UE is positioned; or,

configuring the SRS to be transmitted along with periodic DRS of a serving cell and a neighbor cell where the UE is located; or,

configuring SRS companion DRS transmission based on the signaling indication.

In the foregoing scheme, the transmitting the DRS based on the configured DRS transmission pattern includes: configuring a broadcast channel to accompany DRS transmission;

the configuring the broadcast channel to transmit with the DRS includes:

configuring a broadcast channel to be transmitted along with a periodic DRS, wherein an aperiodic DRS is not transmitted along with the broadcast channel; or,

configuring the broadcast channel starting OFDM symbol to be the same as a first set of PSS/SSS starting OFDM symbol of DRS component; or,

configuring the number of antenna ports corresponding to the broadcast channel to be consistent with the number of antenna ports corresponding to CRS components in DRS; or,

configuring a broadcast channel to be transmitted on an OFDM symbol where CRS components in DRS are located and/or an OFDM symbol adjacent to the CRS; or,

configuring a broadcast channel to be transmitted on at least one carrier of a predefined set of carriers, other ones of the carriers not being configured to transmit the broadcast channel.

In the foregoing scheme, the transmitting the DRS based on the configured DRS transmission pattern includes: based on the configured DRS transmission pattern, controlling periodic DRS and/or non-periodic DRS to transmit based on LBT according to a third preset mode; or controlling the periodic DRS and/or the aperiodic DRS not to be transmitted based on the LBT according to a fourth preset mode.

An embodiment of the present invention further provides a base station, where the base station includes: a configuration unit and a transmission unit; wherein,

the configuration unit is configured to configure a DRS transmission pattern; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain positions, composition parameters;

the transmitting unit is configured to transmit the DRS based on a configured DRS transmission pattern, so that the DRS has periodicity and/or persistence, or aperiodicity and/or persistence.

In the foregoing solution, the configuration unit is configured to configure, when a DRS is in a first half frame of a radio frame, the DRS to be formed by using a reference signal structure based on a first preset subframe; and/or configuring the DRS to be formed by a reference signal structure based on a second preset subframe when the DRS is positioned in the second half frame of the wireless frame.

In the foregoing scheme, the configuration unit is configured to configure the DRS within a DRS time window; the DRS time window has a preconfigured time domain location and time domain length.

In the foregoing solution, the configuration unit is configured to, when a starting subframe occupied by the DRS is an odd subframe or an even subframe, adopt a configuration mode corresponding to the odd subframe or the even subframe;

In the foregoing scheme, the configuration unit is configured to, when an initial OFDM symbol occupied by a DRS burst is an odd symbol or an even symbol, adopt a transmission mode corresponding to the odd symbol or the even symbol;

In the foregoing scheme, the configuration unit is configured to configure the DRS and/or the reservation signal according to a preset rule;

In the foregoing scheme, the configuration unit is configured to configure, according to a first preset configuration manner, that the DRS occupies the system bandwidth in the frequency domain; wherein, configuring the DRS according to the first preset configuration mode to occupy the system bandwidth in the frequency domain includes: configuring a system bandwidth DRS frequency domain pattern according to a preset unit DRS frequency domain pattern; or respectively configuring DRS frequency domains with different bandwidths according to a preset rule; or configuring a conventional PSS/SSS structure in a preset RB of a frequency domain middle frequency band, and configuring other signals in RBs on two sides of the preset RB according to a preset configuration mode.

In the foregoing scheme, the configuration unit is configured to configure, according to a second preset manner, that the DRS is transmitted simultaneously or non-simultaneously with user data; wherein, configuring the DRS and the user data to be transmitted simultaneously or non-simultaneously according to a second preset mode includes: when a DRS transmission pattern in a first preset time domain is consistent with a DRS transmission pattern in a second preset time domain, configuring the DRS to transmit with user data at the same time or at different times; or,

In the foregoing solution, the configuring unit is configured to configure the DRS as a periodic or aperiodic transmission manner; wherein the configuring the DRS as a periodic transmission mode includes: the DRS transmission pattern is in a static or semi-static configuration; the semi-static configuration represents that the DRS transmission pattern does not change in a preset period; the configuring the DRS in an aperiodic transmission manner includes: DRS sends dynamic configuration of pattern, the DRS is triggered based on dynamic signaling.

In the foregoing scheme, the configuring unit is configured to configure SRS transmission accompanied by DRS; the configuring SRS to accompany DRS transmission includes: configuring the SRS and DRS of a serving cell in which the UE is located to transmit concomitantly; or configuring the SRS and the non-periodic DRS of the serving cell in which the UE is located to transmit concomitantly; or configuring the SRS to be transmitted along with periodic DRSs of a serving cell and a neighbor cell where the UE is located; or, configuring SRS accompanying DRS transmission based on the signaling indication.

In the foregoing scheme, the configuration unit is configured to configure a broadcast channel to transmit with a DRS; wherein the configuring the broadcast channel to transmit with the DRS includes: configuring a broadcast channel to be transmitted along with a periodic DRS, wherein an aperiodic DRS is not transmitted along with the broadcast channel; or configuring the broadcast channel starting OFDM symbol to be the same as a first group PSS/SSS starting OFDM symbol of a DRS component; or configuring the number of antenna ports corresponding to the broadcast channel to be consistent with the number of antenna ports corresponding to CRS components in DRS; or configuring a broadcast channel to transmit on an OFDM symbol where CRS components in DRS are located and/or an OFDM symbol adjacent to the CRS; or configuring a broadcast channel to be transmitted on at least one carrier in a predefined carrier group, and not configuring other carriers to transmit the broadcast channel.

In the foregoing scheme, the transmitting unit is configured to control, based on the configured DRS transmission pattern, the periodic DRS and/or the aperiodic DRS to be transmitted based on listen before talk LBT in a third preset manner; or controlling the periodic DRS and/or the aperiodic DRS not to be transmitted based on the LBT according to a fourth preset mode.

According to the method for sending the synchronous signal of the unauthorized carrier and the base station, the base station configures a DRS sending pattern of a discovery reference signal; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain positions, composition parameters; transmitting the DRS based on a configured DRS transmission pattern such that the DRS has periodicity and/or persistence, or aperiodic and/or persistence. Thus, by adopting the technical scheme of the embodiment of the invention, the transmission of the synchronous signal of the unauthorized carrier is realized by configuring at least one parameter of the time parameter, the frequency domain position and the composition parameter in the DRS transmission pattern, and the characteristics of the opportunity occupation and the continuous occupation requirement of the unauthorized carrier can be met.

Drawings

Fig. 1 is a flowchart illustrating a method for transmitting a synchronization signal of an unlicensed carrier according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of a first DRS transmission pattern in a first embodiment of the present invention;

fig. 3 is a schematic diagram of a second DRS transmission pattern in the first embodiment of the present invention;

fig. 4 is a schematic diagram of a third DRS transmission pattern in the first embodiment of the present invention;

fig. 5 is a diagram illustrating a fourth DRS transmission pattern in the first embodiment of the present invention;

fig. 6 is a schematic diagram of a fifth DRS transmission pattern in the first embodiment of the present invention;

fig. 7 is a schematic diagram of a sixth DRS transmission pattern in the first embodiment of the present invention;

fig. 8 is a schematic diagram of a seventh DRS transmission pattern in the first embodiment of the present invention;

fig. 9 is a diagram illustrating an eighth DRS transmission pattern in a first embodiment of the present invention;

fig. 10 is a schematic diagram of a ninth DRS transmission pattern in the first embodiment of the present invention;

fig. 11 is a schematic structural diagram of a base station according to a second embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example one

The embodiment of the invention provides a method for sending a synchronous signal. Fig. 1 is a flowchart illustrating a method for transmitting a synchronization signal of an unlicensed carrier according to a first embodiment of the present invention; as shown in fig. 1, the method for transmitting the synchronization signal includes:

step 101: configuring a DRS transmission pattern; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain locations, composition parameters.

Step 102: transmitting the DRS based on a configured DRS transmission pattern such that the DRS has periodicity and/or persistence, or aperiodic and/or persistence.

As a first implementation manner, in this embodiment, the configuring a DRS transmission pattern includes:

when the DRS is positioned in the first half frame of a wireless frame, configuring the DRS to be formed by adopting a reference signal structure based on a first preset subframe; and/or configuring the DRS to be formed by a reference signal structure based on a second preset subframe when the DRS is positioned in the second half frame of the wireless frame. Wherein the first preset subframe may be subframe 0; the second preset subframe may be subframe 5.

Specifically, the present embodiment has the following preferred examples:

example 1: the DRS transmitted from a subframe 0 to a subframe 4 in a wireless frame is formed by adopting a Reference Signal (RS) structure based on the subframe 0; correspondingly, the DRS transmitted in the subframe 5 to the subframe 9 in the radio frame is formed by an RS structure based on the subframe 5. Fig. 2 is a schematic diagram of a first DRS transmission pattern in a first embodiment of the present invention; as shown in fig. 2, when the DRS is in subframe 2, the DRS is formed by using an RS structure of subframe 0; correspondingly, when the DRS is in subframe 6, the DRS is formed by using an RS structure of subframe 5.

Example 2: when Time Division Duplex (TDD) is adopted and the DRS is constructed based on a primary synchronization signal/secondary synchronization signal (PSS/SSS) structure, the DRS transmitted from subframe 0 to subframe 4 in one radio frame is constructed using the SSS of subframe 0 and the PSS of subframe 1; correspondingly, the DRS transmitted in subframes 5 to 9 in one radio frame is formed by the SSS in subframe 5 and the PSS in subframe 6.

Example 3: when Frequency Division Duplex (FDD) is adopted and the DRS is constructed based on a primary synchronization signal/secondary synchronization signal (PSS/SSS) structure, the DRS transmitted from subframe 0 to subframe 4 in one radio frame is constructed using the PSS/SSS structure of subframe 0; correspondingly, the DRS transmitted in one radio frame from subframe 5 to subframe 9 is constructed by adopting the PSS/SSS structure of subframe 5.

Example 4: the method comprises the following steps that a DRS sent from a subframe 1 to a subframe 4 in a wireless frame is deformed based on an RS sequence corresponding to a subframe 0; the DRSs transmitted in the subframes 6 to 9 are modified based on the RS sequence corresponding to the subframe 5. Wherein the RS sequence may be modified by RS sequence rotation. The preferred method is as follows: sequentially rotating subframes 1 to 4 by an offset relative to the RS sequence of subframe 0; accordingly, sub-frames 6 to 9 are sequentially rotated by an offset with respect to the RS sequence of sub-frame 5. In this embodiment, on one hand, the front and rear half frames of a radio frame may be determined by the relation with the RS sequence of the subframe 0, and on the other hand, different subframes may be distinguished by the difference of the corresponding deformation characteristics (e.g., rotation amount) of the different subframes, thereby achieving synchronization of radio frames. Furthermore, since the RS sequence is based on the modification of the RS sequence of subframe 0 or subframe 5, respectively, rather than a completely new sequence, the complexity of sequence generation and detection can be simplified.

Embodiment 5, when a burst structure of one DRS is mapped to a first half frame and a second half frame of one radio frame at the same time, includes the following implementation manners: (in the following implementation, DRS all adopt RS structure configuration as an example)

In the method 1, DRSs in the first half of a radio frame (i.e., subframe 0 to subframe 4) are formed using an RS structure based on subframe 0, and DRSs in the second half of the radio frame (i.e., subframe 5 to subframe 9) are formed using an RS structure based on subframe 5. Fig. 3 is a schematic diagram of a second DRS transmission pattern in the first embodiment of the present invention; as shown in fig. 3, when the DRS is located on both subframe 4 and subframe 5, that is, when the DRS is located on both the first half frame (i.e., subframe 0 to subframe 4) and the second half frame (i.e., subframe 5 to subframe 9) of the radio frame, a portion of the DRS located in the first half frame (i.e., in subframe 4) of the radio frame is formed by using an RS structure of subframe 0; and the part of the DRS, which is positioned in the second half frame of the radio frame (namely, positioned in the subframe 5), is formed by adopting an RS structure of the subframe 5. The method can keep the unification of different mapping scenes. However, the sequences in the DRS generate two classes, and accordingly, the User Equipment (UE) also needs to detect the two classes separately.

Mode 2: when the starting subframe of the DRS burst structure is in the first half frame of a radio frame (i.e., subframe 0 to subframe 4), the DRS burst structure also includes the second half frame of the radio frame (i.e., subframe 5 to subframe 9), and in this scenario, the transmitted DRS is formed by using an RS structure based on subframe 0. Similarly, when the starting subframe of the DRS burst is in the second half of a radio frame (subframe 5 to subframe 9), the DRS burst structure also includes the first half of the next radio frame of the radio frame, and in this scenario, the transmitted DRS is formed by an RS structure based on subframe 5. Fig. 4 is a schematic diagram of a third DRS transmission pattern in the first embodiment of the present invention; as shown in fig. 4, when the starting position of the DRS is in subframe 4 and includes subframe 5, that is, the DRS includes the upper half frame and the lower half frame of the radio frame, the DRS is configured by using an RS structure based on subframe 0. The method can ensure that only one type of RS sequence is needed for one DRS burst.

As a second implementation manner, in this embodiment, the configuring a DRS transmission pattern includes: configuring DRS in DRS time window; the DRS time window has a preconfigured time domain location and time domain length.

Specifically, the starting position and the ending position of the DRS burst at a time are within one DRS time window. The DRS burst can select a fixed or variable time starting point in the DRS time window as a starting sending point, and an end point does not exceed the DRS time window; the initial transmission point may be a result of performing based on LBT, or may be an initial transmission point configured based on a coordination requirement.

The DRS time window adopts preset configuration parameters; the preset configuration parameter may be a configuration parameter of a DRS burst in LTE R12 release, and a duration of the DRS time window in the FDD system may be 1 millisecond (ms) to 5 ms; the duration of the DRS time window in a TDD system may be 2ms to 5 ms.

The embodiment keeps the original pilot frequency measurement parameters and/or behaviors unchanged. In addition, the DRS parameter in the prior art, which refers to the duration of one DRS burst of R12 in the prior art and now refers to the time window range of one DRS burst that may occur, may also be used; preemption and transmission are limited to this range, which also facilitates range restriction for UE detection, rather than arbitrary location.

In this embodiment, as an embodiment, if the predetermined length of the DRS burst exceeds the DRS time window, the processing manner at least includes the following steps:

the first processing mode is as follows: and intercepting, namely not transmitting the DRS burst part exceeding the DRS time window. This may preserve the time domain length with a uniform DRS time window; fig. 5 is a diagram illustrating a fourth DRS transmission pattern in the first embodiment of the present invention; as shown in fig. 5, the DRS burst portion that exceeds the time window is intercepted and not transmitted.

The second processing mode is as follows: and limiting the starting point of the DRS burst and avoiding the ending part of the DRS burst from exceeding the DRS time window. Therefore, although the flexibility of the selection of the starting point of the DRS burst is limited, the time domain length of the one-time DRS burst is ensured, and the requirement of UE measurement is favorably met;

the third processing mode is as follows: when one DRS burst is composed of at least one component repetition, for example, PSS + SSS are two basic constituent units, assuming that the basic constituent units occupy 4 OFDM symbols; repeating the transmission once, and if the end position of the DRS time window is in the middle position of the basic constituent unit, prolonging the transmission time of the DRS burst of this time until all the components of the basic constituent unit are completely transmitted.

As a third implementation manner, in this embodiment, the configuring the DRS transmission pattern includes: and when the starting subframe occupied by the DRS is an odd subframe or an even subframe, adopting a configuration mode corresponding to the odd subframe or the even subframe.

Specifically, the configuration modes adopted by the DRS in which the starting subframe is an odd subframe or an even subframe include the following modes:

mode 1: for the TDD structure, when the odd subframe and the even subframe map the PSS and the SSS, respectively, the starting subframe occupied by the DRS burst is mapped according to the PSS/SSS corresponding to the parity of the starting subframe. For example, when an original even subframe is mapped to the PSS, when a starting subframe occupied by the DRS burst is an even subframe, the original even subframe is mapped to the PSS; similarly, when the original odd subframe is mapped to the PSS, when the starting subframe occupied by the DRS burst is the odd subframe, the original odd subframe is mapped to the PSS. The method can keep the uniformity of mapping of the odd-even sub-frames. Maintaining uniformity may enable the UE to retrieve the PSS/SSS accordingly based on parity attributes of the received subframe. Therefore, the PSS or SSS corresponding to odd/even subframes under different conditions can not be changed due to different parity attributes of the starting subframes, and the detection complexity is avoided.

Mode 2: and when the DRS burst is composed of at least two subframes, configuring the DRS burst by taking an odd subframe or an even subframe as a starting subframe. As a first implementation manner, taking a preset structure a configured by taking an odd subframe as a starting subframe, when a starting subframe of a DRS burst is an odd subframe, configuring the DRS burst according to the preset structure a and transmitting the DRS burst. As a second implementation manner, when the starting subframe of the DRS burst is an even subframe, the configuration manner of the DRS is as follows: removing the odd subframe part of the preset structure A, and only reserving the even subframe part of the preset structure A and the part behind the even subframe; or, taking the part of the even subframe of the preset structure a as a starting subframe, and configuring the odd subframe part before the even subframe of the preset structure a to the end part of the DRS burst. This approach provides greater flexibility than approach 1, although it adds some complexity. The UE may perform detection according to the above rules based on structure a and the parity attributes of the starting subframe.

Mode 3: respectively configuring DRS structures of odd subframes and even subframes; a primary DRS burst is made up of at least one DRS structure. When the starting position of the DRS burst is an odd subframe, mapping a DRS structure corresponding to the pre-configured odd subframe; and when the starting position of the DRS burst is an even subframe, mapping a DRS structure corresponding to the pre-configured even subframe. The method provides better flexibility, and can be not limited by the parity property of the initial subframe and can map and send more flexibly.

Of course, the configuration of the DRS may also select a combination of at least one of the three manners. The further implementation comprises the following steps:

and 4, defining the starting position of the DRS, so that only one configuration mode of the DRS structure in the three modes is used before the configuration of the DRS in different time slots is changed.

Specifically, when the starting position of the DRS is an odd subframe and the DRS is only mapped to odd subframe configuration for transmission, the DRS structure of the odd subframe configuration mode among the three modes is correspondingly used; or, when the initial position of the DRS is an even subframe and the DRS is only mapped to an even subframe configuration for transmission, the DRS structure of the even subframe mode of the three modes is correspondingly used; or, when the starting position of the DRS is an even subframe and the DRS is mapped to the even subframe and the odd subframe simultaneously for configuration transmission, a DRS structure including both the even subframe and the odd subframe among the three manners is correspondingly used; or, when the starting position of the DRS is an even subframe and the DRS is mapped to the odd subframe and the even subframe simultaneously for configuration transmission, the DRS structure including the odd subframe and the even subframe simultaneously among the three manners is correspondingly used.

Mode 5, partially defining the starting position of DRS, and only selecting the configuration mode combination of two DRS structures among the three modes. For example, when the starting position of the DRS is defined as an odd subframe or an even subframe, and one DRS burst structure is not mapped to both odd subframes and even subframes, only one type of subframes in the odd subframes or even subframes may be mapped.

Mode 6 is not limited to the starting position of the DRS, and any configuration mode of the DRS structure among the three modes may be used based on the selection of the starting position of the current DRS transmission. That is, the starting position of the DRS may be an odd subframe or an even subframe, and one DRS structure mapping may also be mapped only in the odd subframe or the even subframe, or may also be mapped in both the odd subframe and the even subframe.

As a fourth implementation manner, in this embodiment, the configuring the DRS transmission pattern includes: and when the initial OFDM symbol occupied by the DRS burst is configured to be an odd symbol or an even symbol, adopting a transmission mode corresponding to the odd symbol or the even symbol.

Specifically, the configuration modes adopted by the starting OFDM symbol occupied by the DRS burst as an odd symbol or an even symbol include the following modes:

mode 1: and if the odd/even OFDM symbols respectively correspond to different PSS/SSS, mapping the initial OFDM symbol parity occupied by the DRS burst according to the PSS/SSS corresponding to the initial OFDM symbol parity. For example, when an even OFDM symbol is mapped to the PSS, the PSS is also mapped when the starting OFDM symbol of the DRS burst is the even OFDM symbol; similarly, when the odd OFDM symbol is mapped to the PSS, the PSS is also mapped when the starting OFDM symbol of the DRS burst is the odd OFDM symbol. The method can keep the uniformity of mapping of the parity OFDM symbols. Maintaining uniformity may enable the UE to retrieve the PSS/SSS accordingly based on parity attributes of the received subframe. Therefore, the PSS or SSS corresponding to odd/even subframes under different conditions can not be changed due to different parity attributes of the starting subframes, and the detection complexity is avoided.

Mode 2: and when the DRS burst is composed of at least two OFDM symbols, configuring the DRS burst by taking an odd OFDM symbol or an even OFDM symbol as a starting position. As a first implementation manner, taking a preset structure B configured with an odd OFDM symbol as a starting position as an example, when the starting position of a DRS burst at a time is an odd OFDM symbol, configuring the DRS burst according to the preset structure B and transmitting the DRS burst. As a second implementation manner, when the starting position of a DRS burst is an even OFDM symbol, the DRS is configured in a manner that: removing the odd OFDM symbol part of the preset structure B, and only reserving the even OFDM symbol part of the preset structure B and the part behind the even OFDM symbol; or, taking the part of the even OFDM symbol of the preset structure B as the start position, and configuring the odd OFDM symbol part before the even OFDM symbol of the preset structure B to the end part of the DRS burst. This approach provides greater flexibility than approach 1, although it adds some complexity. The UE may perform detection according to the above rules based on structure a and the parity attributes of the starting subframe.

Mode 3: and respectively configuring DRS structures of odd OFDM symbols and even OFDM symbols. The primary DRS burst is composed of a DRS structure of at least one OFDM symbol. When the starting position of the DRS burst is an odd OFDM symbol, mapping a pre-configured DRS structure of the odd OFDM symbol; and when the initial position of the DRS burst is an even OFDM symbol, mapping a pre-configured DRS structure of the even OFDM symbol. The method provides better flexibility, and can be not limited by the parity property of the initial subframe and can map and send more flexibly.

Specifically, when the starting position of the DRS is an odd OFDM symbol and the DRS is only mapped in an odd OFDM symbol configuration for transmission, the DRS structure of the odd OFDM symbol configuration mode of the three modes is correspondingly used; or, when the initial position of the DRS is an even OFDM symbol and the DRS is only mapped to even OFDM symbol configuration transmission, the DRS structure of the even OFDM symbol configuration mode of the three modes is correspondingly used; or, when the starting position is an even OFDM symbol and the DRS is simultaneously mapped in the even OFDM symbol and the odd OFDM symbol configuration transmission, the DRS structure including the even OFDM symbol and the odd OFDM symbol configuration manner among the three manners is correspondingly used; or, when the starting position of the DRS is an even OFDM symbol and the DRS is mapped to the odd OFDM symbol and the even OFDM symbol at the same time for configuration and transmission, the DRS structure including the odd OFDM symbol and the even OFDM symbol configuration in the three manners is correspondingly used.

Mode 5, partially defining the starting position of DRS, and only combining the configuration modes of two DRS structures in the three modes. For example, when the starting position of the DRS is defined as an odd OFDM symbol or an even OFDM symbol, and one DRS burst structure is not mapped to both the odd OFDM symbol and the even OFDM symbol, only one type of OFDM symbol among the odd OFDM symbol or the even OFDM symbol is mapped.

Mode 6 is not limited to the starting position of the DRS, and any configuration mode of the DRS structure among the three modes may be used based on the selection of the starting position of the current DRS transmission. That is, the starting position of the DRS may be an odd OFDM symbol or an even OFDM symbol, and one DRS structure mapping may also be mapped to only one type of OFDM symbol in the odd OFDM symbol or the even OFDM symbol, or may also be mapped to both the odd OFDM symbol and the even OFDM symbol.

Fig. 6 is a schematic diagram of a fifth DRS transmission pattern in the first embodiment of the present invention; as shown in fig. 6, this example is a schematic diagram that a starting OFDM symbol occupied by the DRS is an odd symbol, that is, the starting OFDM symbol occupied by the DRS is symbol 5; in this illustration, the DRS is comprised of an SSS structure.

Fig. 7 is a schematic diagram of a sixth DRS transmission pattern in the first embodiment of the present invention; as shown in fig. 7, this example is a schematic diagram that a starting OFDM symbol occupied by the DRS is an even symbol, that is, the starting OFDM symbol occupied by the DRS is symbol 4; in this illustration, the DRS is comprised of a CRS structure.

As a fifth implementation manner, in this embodiment, the configuring a DRS transmission pattern includes: the DRS and/or the reservation signal are configured according to a preset rule.

Specifically, the DRS and/or the reservation signal may be configured according to a preset rule in the following manners:

mode 1: when a first condition is met, the configured DRS transmission pattern only includes DRSs and does not include a reservation signal.

In this approach, the DRS is transmitted when the LBT successfully starts to camp on. Specifically, when the starting position of the DRS is an OFDM symbol edge, in order to control the DRS to be aligned with the starting OFDM symbol edge, the following several manners may be adopted: 1. controlling DRS burst structure translation to align with the starting OFDM symbol; 2. and controlling the DRS burst structure and the limited OFDM symbol as a starting transmission position, and intercepting the rest part of the DRS burst structure after the starting OFDM symbol starts. In the second mode, the DRS with the partial burst structure reserved can still be measured due to the complete OFDM symbol. For example, when the mapping start point of the DRS burst structure is symbol n (n >0) and the start point occupied by a carrier is symbol n +1, the component corresponding to symbol n of the DRS structure is removed, and only symbol n +1 and components thereafter in the DRS structure are transmitted.

In order to ensure that the DRS is aligned with the edge of the OFDM symbol, the following control methods may be adopted: 1. limiting the LBT of the DRS; preferably, LBT is performed before the OFDM symbol edge, and this LBT procedure is completed at the OFDM symbol edge, and if LBT preemption is successful, occupation can be started at the OFDM symbol edge. For example, by using an LBT of a Frame based device (FBE), a CCA window of the LBT is configured before an edge of the OFDM symbol, and if the CCA successfully occupies a resource, the resource may be occupied at the beginning of the OFDM symbol and the DRS signal may be transmitted. Or, using LBT of a Load-Based device (LBE), where an end position of an LBT procedure is limited to be before an edge of the OFDM symbol, and if the LBT procedure successfully occupies a resource, the LBT procedure may start to occupy the resource at the OFDM symbol and transmit the DRS signal; 2. when the starting position of the DRS burst is in the middle of the ith (i >0) OFDM symbol (for example, the remaining length of the DRS burst excluding the ith OFDM symbol is L), controlling the second half of the DRS burst structure on the (i + 1) th OFDM symbol (i.e., the part of the DRS with the remaining length of L) to be copied on the ith OFDM symbol. The method is equivalent to lengthening the length of a Cyclic Prefix (CP) on the (i + 1) th OFDM; or, the CP length of the (i + 1) th OFDM symbol is lengthened to the occupied starting point of the nth OFDM symbol. By extending the CP length, synchronization requirements can be reduced, thereby improving detection performance.

And when the starting position of the DRS is in the middle of the OFDM symbol, indicating that the DRS occupies the application scene of the incomplete OFDM symbol.

Mode 2: when a second condition is met, the configured DRS transmission pattern comprises a DRS and a reserved signal; wherein the DRS and the reservation signal are respectively independent signals.

In this embodiment, the DRS transmission pattern including the DRS and the reserved signal includes the following application scenarios:

scene one: after LBT is successfully occupied, a reserved signal is configured when the occupied initial position is an incomplete OFDM symbol, that is, the reserved signal is configured when the occupied initial position is in the middle of the OFDM symbol. Specifically, the configuration reservation signal occupies the incomplete OFDM symbol, and the DRS is configured and transmitted at the first complete OFDM symbol. The method can adopt resources as much as possible to transmit the DRS so as to better perform DRS measurement.

Scene two: and at least transmitting a reserved signal with the time length of T (T >0), enabling the end position of the reserved signal with the time length of T to be an OFDM symbol edge, and reconfiguring and transmitting the DRS, namely starting to transmit the DRS through a complete OFDM symbol. The method can obtain better initial synchronization, Automatic Gain Control (AGC) and the like by using the reserved signal so as to better perform DRS measurement.

Scene three: a DRS structure starting OFDM symbol is limited on at least one OFDM symbol; configuring a reservation signal to last from an occupied starting point until the at least one OFDM symbol edge defined by the DRS structure. Preferably, when a starting point defined by the DRS structure has a plurality of options, if a distance between the occupied starting point and a position defined by a jth (j >0) DRS structure is greater than or equal to a predetermined time duration t (t >0), configuring a reservation signal to last to the position defined by the jth DRS structure; and if the distance between the occupied starting point and the position defined by the jth DRS structure is less than the preset time length t, configuring a reserved signal to be continuous to the position defined by the jth +1 DRS structure. Therefore, the reserved signal with a certain time length can be ensured, and better initial synchronization, AGC and the like can be obtained by utilizing the reserved signal so as to better perform DRS measurement.

Mode 3: when a third condition is met, the configured DRS transmission pattern comprises a DRS and a reserved signal; wherein the reservation signal is a constituent of the DRS.

In this manner, after LBT is successfully occupied, under the condition that DRS cannot be sent immediately, a reserved signal component in DRS may be selected to perform channel resource reservation, which may specifically include the following scenarios:

scene one: and configuring reserved signal components in the DRS when the occupied initial position is an incomplete OFDM symbol, namely, configuring and transmitting the DRS at the first complete OFDM symbol by using the reserved signal components in the DRS to occupy the incomplete OFDM symbol. The method can transmit the DRS signals by resources as much as possible so as to better perform DRS measurement.

Scene two: and at least transmitting reserved signal components in the DRS with the time length of T, enabling the end position of the reserved signal components in the DRS with the time length of T to be an OFDM symbol edge, and reconfiguring and transmitting the DRS. The method can obtain better initial synchronization, AGC and the like by using the reserved signal components in the DRS so as to better measure the DRS.

Scene three: a DRS structure starting OFDM symbol is limited on at least one OFDM symbol; reserved signal components in the DRS persist from an occupied starting point to the at least one OFDM symbol edge defined by the DRS structure. Preferably, when a starting point defined by the DRS structure has a plurality of options, if a distance between the occupied starting point and a position defined by a jth DRS structure is greater than or equal to a predetermined time period T, configuring reserved signal components in the DRSs to persist to the position defined by the jth DRS structure; and if the distance between the occupied starting point and the position defined by the jth DRS structure is less than the preset time length T, configuring the reserved signal components in the DRS to be continuously located at the position defined by the jth +1 DRS structure. Therefore, the reserved signal with a certain time length can be ensured, and better initial synchronization, AGC and the like can be obtained by using the reserved signal component in the DRS so as to better perform DRS measurement.

As a sixth implementation manner, in this embodiment, the configuring a DRS transmission pattern includes: configuring a DRS to occupy the system bandwidth on a frequency domain according to a first preset configuration mode;

and configuring a conventional PSS/SSS structure in a preset RB of a frequency domain middle frequency band, and configuring other signals in RBs on two sides of the preset RB according to a preset configuration mode.

Specifically, the configuring of the system bandwidth occupied by the DRS frequency domain includes the following several ways:

mode 1: configuring a system bandwidth DRS frequency domain pattern according to a preset unit DRS frequency domain pattern (such as a 5MHz DRS frequency domain pattern);

mode 2: respectively configuring DRS frequency domains for different bandwidths according to preset rules;

mode 3: configuring a conventional PSS/SSS structure in a preset RB of a frequency domain middle frequency band, and configuring other signals in RBs on two sides of the preset RB according to a preset configuration mode;

the DRS frequency domain pattern configuration manners of the

manners

1 and 2 include: and configuring a conventional PSS/SSS in a preset RB of a frequency domain middle frequency band, and configuring at least one PSS/SSS copy in RBs on two sides of the preset RB according to a preset configuration mode.

Specifically, for the above mode 1, for a system bandwidth greater than 5MHz, configuring a repetition of the DRS frequency domain pattern according to a preset DRS pattern of a 5MHz basic bandwidth. For example, in a 20MHz system bandwidth, the DRS frequency domain pattern is formed by 4 DRS frequency domain patterns of 5MHz base bandwidth. By adopting the method, the configuration is only needed to be carried out aiming at one preset basic bandwidth, so the design complexity is simplified, and the complexity of UE detection is also facilitated to be simplified.

Specifically, the configuration mode of the reference signal composed of DRS in the 5MHz frequency domain may include: for the PSS and SSS components in DRS, first, the middle 6 Resource Blocks (RBs) in the 5MHz frequency domain configure a regular PSS/SSS, and then configure one PSS/SSS replica based on the RBs on both sides of the middle 6 RBs. The method for configuring one PSS/SSS copy by the RBs on the two sides respectively comprises the following steps: 1. PSS/SSS copies are symmetrically placed on the RBs on the two sides, namely DRS frequency domain patterns are symmetrical; 2. the PSS/SSS copies of the RB configurations on the two sides have the same sequence as the PSS/SSS copies of the middle 6 RB configurations, so that the design is simplified; or, the sequences used by the PSS/SSS copies placed by the RBs on the two sides are a modification of the sequence used by the PSS/SSS of the middle 6 RB configurations, and the modification is not included in the range selectable by the conventional PSS/SSS, so as to reduce confusion brought by the UE when detecting the conventional PSS/SSS as much as possible; 3. the PSS/SSS copies configured by the RBs on the two sides can select the RB occupying the edge of the 5MHz bandwidth, and at least one RB is left between the RB configured with the PSS/SSS in the middle, so that the 5MHz bandwidth can be occupied as much as possible; or, the PSS/SSS copies are configured at the beginning of the adjacent 6 RBs with the conventional PSS/SSS configured in the middle, and other RBs are left, so that the interference to the adjacent bandwidth can be reduced as much as possible; alternatively, an edge margin RB, e.g., 1 RB, is left to reduce side effects.

As for the above mode 2, the configuration of the DRS frequency domain patterns according to the preset rule by different bandwidths specifically includes the following application scenarios:

scene 1: the configuration of the DRS frequency domain image at the 5MHz bandwidth may be: for the PSS and SSS components in the DRS, firstly, the conventional PSS/SSS is configured for the middle 6 RBs in the 5MHz frequency domain, and then one PSS/SSS copy is configured for the RBs on the two sides. For this mode, specific reference may be made to the above description, which is not repeated herein.

Scene 2: the configuration of the DRS frequency domain image at 10MHz bandwidth may be: for the PSS and SSS components in DRS, first, the middle 6 RBs in the 10MHz frequency domain are configured with the regular PSS/SSS. And at least one copy of the PSS/SSS is configured for the RBs on the two sides respectively. Wherein,

1. the mode of configuring 1 PSS/SSS copy for the RBs on both sides comprises the following modes: 1. PSS/SSS copies are symmetrically placed on the RBs on the two sides, namely DRS frequency domain patterns are symmetrical; 2. the PSS/SSS copies of the RB configurations on the two sides have the same sequence as the PSS/SSS copies of the middle 6 RB configurations, so that the design is simplified; or, the sequences used by the PSS/SSS copies placed by the RBs on the two sides are a modification of the sequence used by the PSS/SSS of the middle 6 RB configurations, and the modification is not included in the range selectable by the conventional PSS/SSS, so as to reduce confusion brought by the UE when detecting the conventional PSS/SSS as much as possible; 3. the PSS/SSS copies configured by the RBs on the two sides can select the RB occupying the edge of the 10MHz bandwidth, and at least one RB is left between the RB configured with the PSS/SSS in the middle, so that the 10MHz bandwidth can be occupied as much as possible; or, the PSS/SSS copies are configured at the beginning of the adjacent 6 RBs with the conventional PSS/SSS configured in the middle, and other RBs are left, so that the interference to the adjacent bandwidth can be reduced as much as possible; alternatively, an edge margin RB, e.g., 1 RB, is left to reduce side effects.

2. The method for configuring 2 PSS/SSS copies on two sides comprises the following steps: 1. PSS/SSS copies are symmetrically placed on the RBs on the two sides, namely DRS frequency domain patterns are symmetrical; 2. the PSS/SSS copies of the RB configurations on the two sides have the same sequence as the PSS/SSS copies of the middle 6 RB configurations, so that the design is simplified; or, the sequences used by the PSS/SSS copies placed by the RBs on the two sides are a modification of the sequence used by the PSS/SSS of the middle 6 RB configurations, and the modification is not included in the range selectable by the conventional PSS/SSS, so as to reduce confusion brought by the UE when detecting the conventional PSS/SSS as much as possible; 3. the PSS/SSS copies configured by the RBs on the two sides can select the RB occupying the edge of the 10MHz bandwidth, and at least one RB is left between the RB configured with the PSS/SSS in the middle, so that the 10MHz bandwidth can be occupied as much as possible; or, the PSS/SSS copies are configured at the beginning of the adjacent 6 RBs with the conventional PSS/SSS configured in the middle, and other RBs are left, so that the interference to the adjacent bandwidth can be reduced as much as possible; alternatively, an edge margin RB, e.g., 1 RB, is left to reduce side effects; 4. the 2 PSS/SSS copies, wherein one PSS/SSS copy is configured at the edge of the system bandwidth, as one embodiment, a part of RB may be left vacant, for example, 1 RB; the other PSS/SSS copy is configured in the middle position where the center PSS/SSS and the edge PSS/SSS are symmetrical, the PSS/SSS copy can be uniformly configured as far as possible in the mode, signals are occupied more uniformly, and the uniformity of measurement sampling in a frequency domain is facilitated.

3. The method for configuring 3 PSS/SSS copies on two sides comprises the following steps: 1. PSS/SSS copies are symmetrically placed on the RBs on the two sides, namely DRS frequency domain patterns are symmetrical; 2. the PSS/SSS copies of the RB configurations on the two sides have the same sequence as the PSS/SSS copies of the middle 6 RB configurations, so that the design is simplified; or, the sequences used by the PSS/SSS copies placed by the RBs on the two sides are a modification of the sequence used by the PSS/SSS of the middle 6 RB configurations, and the modification is not included in the range selectable by the conventional PSS/SSS, so as to reduce confusion brought by the UE when detecting the conventional PSS/SSS as much as possible; 3. the PSS/SSS copies configured by the RBs on the two sides can select the RB occupying the edge of the 10MHz bandwidth, and at least one RB is left between the RB configured with the PSS/SSS in the middle, so that the 10MHz bandwidth can be occupied as much as possible; or, the PSS/SSS copies are configured at the beginning of the adjacent 6 RBs with the conventional PSS/SSS configured in the middle, and other RBs are left, so that the interference to the adjacent bandwidth can be reduced as much as possible; alternatively, an edge margin RB, e.g., 1 RB, is left to reduce side effects; 4. the 3 PSS/SSS copies, the outer one, are configured at the edge of the system bandwidth, and may have a spare part RB, for example, 1 RB, and the remaining two PSS/SSS copies are configured at the middle position where the central PSS/SSS and the edge PSS/SSS are symmetrical, which may place several PSS/SSS copies as uniformly as possible, occupy more uniform signals, and is also beneficial to uniform measurement sampling of the frequency domain.

Scene 3: the configuration of the DRS frequency domain image at 15/20MHz bandwidth may be: for the PSS and SSS components in DRS, first, the middle 6 RBs in the 15/20MHz frequency domain is configured with the regular PSS/SSS. And at least one PSS/SSS copy is respectively configured on the RBs on the two sides. The specific implementation manner is the same as the configuration manner of the DRS frequency domain image with the bandwidth of 10MHz, and is not described here again.

For the above mode 3, that is, the conventional PSS/SSS is configured in the preset RB of the frequency domain middle band, and the RBs on both sides of the preset RB configure other signals according to the preset configuration mode, and the other signals may adopt CRS or CSI-RS. Fig. 8 is a schematic diagram of a seventh DRS transmission pattern in the first embodiment of the present invention, as shown in fig. 8, where R denotes a CRS. Thus, the DRS can be more sparse in the frequency domain, giving an opportunity to transmit other data signals. The CRS or the CSI-RS may be CRS/CSI-RS components in DRS whose constituent features are consistent with those on other OFDM symbols of DRS. For example, the number of antenna ports is consistent, and the sequences used are consistent.

As a seventh implementation manner, in this embodiment, the configuring a DRS transmission pattern includes: configuring the DRS and user data to be transmitted at the same time or different times according to a second preset mode;

and when the DRS transmission pattern in the first preset time domain is inconsistent with the DRS transmission pattern in the second preset time domain, configuring the DRS to transmit with user data at the same time or at different times.

Specifically, the configuring of the DRS and the user data to be sent at the same time or at different times includes the following scenarios:

scene 1: a scene in which a DRS transmission pattern in the first preset time domain and a DRS transmission pattern in the second preset time domain are inconsistent, that is, a scene in which a transmission pattern of DRS is inconsistent in a time domain with a duration of T1 and a time domain with a duration of T2; wherein both T1 and T2 are greater than zero. The scene comprises the following embodiments:

the first implementation mode comprises the following steps: when the DRS is transmitted together with user data, only an RB in the center of a system bandwidth can be configured to transmit a PSS/SSS, and RBs on two sides cannot transmit PSS/SSS copies; wherein, the RBs on both sides can be used for configuring and transmitting user data.

The second embodiment: when the DRS is transmitted together with user data, only an RB in the center of a system bandwidth can be configured to transmit a PSS/SSS, and RBs on two sides cannot transmit PSS/SSS copies; and transmitting the CRS/CSI-RS in the DRS component. Due to the sparse occupation of the frequency domain, REs occupied by reference signals on these OFDM symbols puncture the data: 1. when data is subjected to rate matching, the RE occupied by the reference signal is considered as an unavailable RE; 2. and when the data is subjected to rate matching, the REs occupied by the reference signals are considered as available REs, but the data corresponding to the REs are removed during data mapping.

The third embodiment is as follows: short duration DRS bursts are configured. E.g., only one basic structure of DRS.

In a scenario where the DRS transmission pattern in the first preset time domain and the DRS transmission pattern in the second preset time domain are not consistent, the UE needs to assume two possible DRS structures, which may be based on detection measurement; the system may also be selected to display a DRS structure used for notifying the UE currently, for example, whether there is data to be transmitted simultaneously or only select to notify the change of the DRS structure, and whether there is data to be transmitted simultaneously is transparent to the UE.

Further, when the DRS is transmitted together with user data, the DRS cannot be mapped to a Resource Element (RE, Resource Element) in which a demodulation reference signal (DMRS) is located; and/or the REs on which the Physical Broadcast Channel (PBCH) is transmitted cannot be mapped.

Scene 2: and a scene in which the DRS transmission pattern in the first preset time domain and the DRS transmission pattern in the second preset time domain are consistent, that is, a scene in which the DRS transmission patterns are consistent in the time domain of the duration of T1 and the time domain of the duration of T2. In this scenario, it is shown that the DRS fills the entire system bandwidth of the OFDM symbol in which it is located. Preferably, only the RBs in the center of the system bandwidth may be configured to transmit the PSS/SSS, and the RBs on both sides may not be configured to transmit a PSS/SSS replica, and transmit the CRS and/or CSI-RS in the DRS component. Since the CRS and/or CSI-RS components are sparsely occupied in the frequency domain, these RBs can still be used for scheduling transmission of user data.

When the PSS/SSS is located in an OFDM symbol, the RBs on both sides use an extension method of PSS/SSS copies, that is, the RBs on both sides use a preset rule to configure PSS/SSS copies, and only the spare RBs can transmit user data. Wherein, the spare RB selects not to configure the transmission user data, or the RE occupied by the reference signals on the OFDM symbols punctures data: 1. rate-matched REs are considered unavailable; 2. and when the data is subjected to rate matching, the REs occupied by the reference signals are considered as available REs, but the data corresponding to the REs are removed during data mapping.

As an eighth implementation manner, in this embodiment, the configuring the DRS transmission pattern includes: configuring the DRS as a periodic or aperiodic transmission mode;

Here, the periodic DRS has at least one of the following features: the DRS transmission pattern is in a static or semi-static configuration, i.e. the DRS transmission pattern is not changed within a preset time range. The periodic transmission mode, i.e. a preset period (i.e. the preset time range), allows a certain offset to be performed based on pre-configuration, and the offset mode is predefined; the UE and UEs of other neighbor cells may be informed to perform measurements.

The aperiodic DRS has at least one of the following characteristics: the DRS sending pattern is dynamically configured, namely the DRS sending pattern changes in real time or changes in a first preset time range; the first preset time range is smaller than the preset time range, that is, the first preset time range is smaller than the preset period. The aperiodic transmission mode needs dynamic signaling notification because of dynamic aperiodic trigger transmission, and is preferably used for UE measurement of service in consideration of interaction delay requirements; thus, as an embodiment, only the serving UE is notified to perform the measurements. The aperiodic DRS is mainly used for synchronization, AGC, and/or channel state information measurement, and/or channel occupancy of its served UEs.

The structure of the non-periodic DRS is different from that of the periodic DRS.

When the aperiodic DRS is used for measuring channel state information, if the channel state information is measured based on CRS, configuring an antenna port of a CRS component in the aperiodic DRS to be consistent with the CRS which is conventionally used for measuring the channel state information; and if the CSI-RS is used for measuring the CSI, configuring the antenna port of the CSI-RS component in the aperiodic DRS to be consistent with the CSI-RS which is conventionally used for measuring the CSI. And the base station triggers the aperiodic DRS in an aperiodic way, and the UE can measure the channel state information based on CSI-RS and/or CRS components in the aperiodic DRS. Further, the UE needs to be triggered to perform measurement, and the triggering method may be as follows: (1) explicit, signaled by physical layer control signaling. Preferably common control signaling, that is, the UE can receive the common control signaling simultaneously and notify the plurality of UEs simultaneously; (2) in an implicit manner, the aperiodic DRS is present in an initial subframe, e.g. a first or second subframe, of the occupied period by default, and the UE performs measurements on the default subframe. Or, the UE performs measurement on k subframes before resource preemption by default.

If the aperiodic DRS and the CSI-RS and/or the CRS conventionally used for channel state information measurement occur in the same subframe and/or adjacent subframes, the following processing may be performed: (1) simultaneously sending, informing UE of the aperiodic DRS to measure channel state information based on CSI-RS and/or CRS components in the aperiodic DRS, wherein the UE can not only measure the channel state information but also measure and obtain other information carried by the aperiodic DRS through the aperiodic DRS; and UE which does not inform the aperiodic DRS carries out channel state information measurement based on CSI-RS and/or CRS which are conventionally used for channel information measurement. (2) Simultaneously sending, informing UE of the aperiodic DRS not to measure channel state information based on CSI-RS and/or CRS components in the aperiodic DRS, but to measure channel state information based on the conventional CSI-RS and/or CRS, and the UE obtains other information carried by the aperiodic DRS through measurement by the aperiodic DRS; and UE which does not inform the aperiodic DRS carries out channel state information measurement based on CSI-RS and/or CRS which are conventionally used for channel information measurement. The aperiodic DRS may adopt a structure of periodic DRS, that is, the number of antenna ports of CSI-RS and/or CRS components thereof is small, and does not need to be consistent with the antenna ports of the conventional CSI-RS and/or CRS. (3) Transmitting only the regular CSI-RS and/or CRS at different times. Since the conventional CSI-RS and/or CRS may already satisfy the primary channel state measurement, etc., the resource overhead of the aperiodic DRS may be reduced. But the specific information carried by the aperiodic DRS cannot be transmitted and measured. (4) And transmitting the non-periodic DRS only when the transmission is not simultaneous. The resource overhead of conventional CSI-RS and/or CRS may be reduced. However, notifying all UEs that need to measure based on the conventional CSI-RS and/or CRS may generate a certain signaling overhead.

When the aperiodic DRS is used for channel occupation, there are two scenarios:

scene 1: the non-periodic DRS is sent before the initial sending of data, that is, part or all of the DRS structure is sent without overlapping with the data sending. For the non-overlapping P1 part of the DRS, since no data is transmitted, the P1 part of the DRS may be used for channel occupation. Preferably, the P1 part structure of the DRS occupies bandwidth in the time domain continuously and/or in the frequency domain to meet the specification requirement of the claimed bandwidth. Or, the aperiodic DRS is transmitted at the end of data transmission, that is, part or all of the DRS structure is transmitted without overlapping with data transmission, and for the non-overlapping P2 part of the DRS, the P2 part structure of the DRS occupies bandwidth in the time domain continuously and/or in the frequency domain to meet the specification requirement of purported bandwidth.

Scene 2: the aperiodic DRS is transmitted in the middle of data. The scene comprises the following embodiments:

example 1: and transmitting part or all of the signals P3 of the aperiodic DRS and data at the same time, wherein the P3 part of the DRS and the data occupy different resources on a frequency domain. Specifically, the P3 part of the DRS may occupy frequency domain resources that are not occupied by data, and this way may also play a role in channel occupancy. For example, the bandwidth occupied by data transmission does not meet the specification requirement, and the P3 part of the DRS may be adopted to jointly achieve that the occupied bandwidth meets the specification requirement.

Example 2: fig. 9 is a diagram illustrating an eighth DRS transmission pattern in a first embodiment of the present invention; as shown in fig. 9, a part of the timeslot resources T1 in the middle of the data structure is empty, and the aperiodic DRS is configured to be continuously occupied on the resource where the timeslot resource T1 is located to transmit the aperiodic DRS, so as to achieve the purpose of channel occupation, and thus, the timeslot resource T1 can be prevented from being occupied by idle loading considered by other nodes.

As a ninth implementation manner, in this embodiment, the configuring a DRS transmission pattern includes: configuring Sounding Reference Signal (SRS) to accompany DRS transmission;

the configuring SRS to accompany DRS transmission includes:

configuring SRS companion DRS transmission based on the signaling indication.

Here, Channel State Information (CSI) of a downlink (DL, Down Link) and an UpLink (UL, UpLink) may be obtained, respectively, using Channel reciprocity, the CSI being used for scheduling of an adjacent DL and/or UL.

As a first application scenario, carrier preemption of UL is a scenario where a base station (eNB) performs LBT.

Specifically, based on DRS transmission requirements, the eNB performs carrier preemption. Fig. 10 is a schematic diagram of a ninth DRS transmission pattern in the first embodiment of the present invention; as shown in fig. 10, the occupancy duration is set to T1+ T2; wherein, T2 is used for a User Equipment (UE) to transmit SRS to a base station; t1 is used for the base station to send DRS to the UE; t2 is immediately adjacent to T1. Here, the UE transmits the SRS to the base station at time T2 immediately after time T1 at which the DRS is received. On one hand, in order to ensure that the time interval between DL and UL is small enough, SRS transmission is advanced as much as possible; on the other hand, to improve the accuracy of the measurement, the SRS may repeatedly transmit a plurality of OFDM symbols. Preferably, the SRS occupies at least 80% of the nominal system bandwidth.

Wherein, T₀≤T≤T_MAX，T₀Indicating a minimum allowed occupancy duration, T_MAXIndicating the maximum allowed occupancy period.

Further, the specific implementation of configuring SRS to accompany DRS transmission in this embodiment includes the following:

1. configuring the SRS to transmit with the DRS of the serving cell where the UE is located, but not with DRSs of other neighbor cells;

2. the non-periodic DRS carrier preemption and transmission may be triggered. Preferably, only the UE of the serving cell is notified for the UE within the serving cell, while UEs of other neighbor cells may not know the aperiodic DRS. Triggering aperiodic DRS transmission can be used for at least one of the following purposes: CSI measurement, synchronization measurement requirements, requirements for SRS transmission.

3. Two types of DRS: periodic (or quasi-periodic) DRS, aperiodic DRS. A periodic (or quasi-periodic) DRS, which is simultaneously used for the UE of the serving cell and the UE of the adjacent cell; the aperiodic DRS may be used only by the UE in the local cell. The periodic (or quasi-periodic) DRS needs to notify the UEs of the surrounding cells, while the non-periodic DRS needs to notify the UEs of the local cell only. The quasi-periodic DRS means that a periodic manner occurs, but each periodic point is a time window, and DRSs may have a certain offset on the left and right in the time window, and/or some of the periods may not be transmitted.

4. Whether the UE transmits the SRS is controlled by the instruction of the eNB. The specific indication mode can be as follows: each time the control information indicates whether to transmit; alternatively, the semi-static configuration changes the transmission mode: a mode in which an SRS is transmitted or a mode in which an SRS is not transmitted.

The trigger transmission time is preferably an aperiodic SRS.

Preferably, the time domain resource occupied by the transmission is in the last OFDM symbol of a subframe.

5. For the problem of collision between the DRS and/or SRS and data transmission, the processing method may be:

the eNB indicates not to transmit the DRS and/or the SRS and avoids colliding with user data; or the eNB indicates not to transmit the user data, so that the user data is prevented from colliding with the DRS and/or the SRS;

or, allowing transmission of the DRS and/or SRS.

For the relationship between the DRS and/or SRS for UL and the user data, the DRS and/or SRS may be configured to be transmitted in the last OFDM symbol, and it is only necessary that the last OFDM symbol is not configured to transmit the user data, thereby avoiding the collision between the user data and the DRS and/or SRS. When the DRS and/or SRS need to occupy multiple OFDM symbols, the DRS and/or SRS may be transmitted in multiple OFDM symbols behind a preceding subframe of one UL subframe, or the DRS and/or SRS may be transmitted in multiple OFDM symbols behind a next subframe of one UL subframe; of course, the last OFDM symbol of the UL subframe may also be included; preferably, the DRS and/or the SRS is configured to transmit the SRS in the last OFDM symbol of a subframe.

For the relationship between DRS and/or SRS for DL and user data, it may be transmitted in UpPTS, or transmitted occupying the first N1 OFDM symbols of one subframe, where N1 is a positive integer. Preferably, N2 OFDM symbols in the control field of one subframe are transmitted, N2 is a positive integer, N2 is equal to or less than N1, and the number of OFDM symbols is not more than 3. Wherein, the first N3 OFDM symbols of a DL subframe are generally control fields, N3 is a positive integer, and N3 is greater than N2, and no user data is mapped.

As a second application scenario, the UE performs a scenario in which LBT preempts UL carrier resources.

Here, the UE performs LBT at a time when DRS may appear, and since a base station authorizing carrier-Assisted Access (LAA) already occupies and transmits the DRS, the probability that the UE seizes successfully immediately following the DRS transmission time is high.

And the eNB triggers/configures aperiodic DRS measurement, and the UE executes LBT at the end position of the configured aperiodic DRS, preempts and transmits the SRS.

The beneficial effect of the embodiment is that the random occupation of the carrier wave makes the CSI-RS transmission random. This makes the measurement feedback of CSI not timely meet the timeliness of the scheduling requirements. By adopting SRS accompanying transmission, uplink and downlink CSI can be obtained well in time based on the SRS. The method is also beneficial to solving the problem that the occupation duration of the DRS is probably less than 1 ms; the CSI can be obtained in time.

As a tenth implementation manner, in this embodiment, the configuring the DRS transmission pattern includes: configuring a broadcast channel to accompany DRS transmission;

the configuring the broadcast channel to transmit with the DRS includes:

Specifically, the configuring, according to a third preset mode, a broadcast channel to accompany DRS transmission includes at least one of the following modes:

(1) only the periodic DRS is transmitted along with the broadcast channel, and the aperiodic DRS is not transmitted along with the broadcast channel.

(2) For the scene that the broadcast channel occupies partial bandwidth, other frequency resources of the system bandwidth preferably map at least one RS component of the DRS; wherein,

in the first embodiment, the broadcast channel is configured on a preset number of RBs in the center of one carrier, for example, the broadcast channel is configured on 6 RBs in the middle of the carrier to transmit;

in a second embodiment, other frequency resources of the system bandwidth preferably map at least one RS component of the DRS, where the RS component includes CSI-RS and/or CRS.

(3) The starting OFDM symbol of the broadcast channel is the same as the first set of PSS/SSS starting OFDM symbols of the DRS components; or, the starting OFDM symbol of the broadcast channel is on an OFDM symbol after the first set of PSS/SSS. The UE can obtain synchronization and ID information based on the PSS/SSS component of the DRS in a preferred mode, and therefore the broadcast channel can be identified and demodulated conveniently.

(4) The number of antenna ports corresponding to the broadcast channel is consistent with the number of antenna ports corresponding to CRS components in the DRS; preferably, the number of ports is 1. The number of antenna ports corresponding to the broadcast channel is identical to the number of antenna ports corresponding to the CRS components of the DRS, which is advantageous for demodulation based on the CRS components.

(5) And the broadcast channel is configured on an OFDM symbol where CRS components in the DRS are located and/or an OFDM symbol adjacent to the CRS to be transmitted, so that the UE can demodulate the broadcast channel based on the CRS conveniently.

(6) Configuring a broadcast channel to be transmitted on at least one carrier in a predefined carrier group, wherein carriers other than the at least one carrier are not configured to transmit the broadcast channel. E.g. a predefined carrier group CG consisting of N carriers. The carrier C1 configured therein transmits the broadcast channel, and the other N-1 carriers in the carrier group CG do not transmit the broadcast channel.

In this embodiment, the sending the DRS based on the configured DRS sending pattern includes: based on the configured DRS transmission pattern, controlling periodic DRS and/or non-periodic DRS to transmit based on LBT according to a third preset mode; or controlling the periodic DRS and/or the aperiodic DRS not to be transmitted based on the LBT according to a fourth preset mode. The method comprises the following several embodiments:

example 1: the periodic DRS is transmitted based on LBT, and the aperiodic DRS is not transmitted based on LBT. Wherein, the aperiodic DRS can be sent based on Short Control information (SCS) mode; and/or, the aperiodic DRS is accompanied by user data transmission, and does not need to perform special LBT specially for the aperiodic DRS transmission. The method is beneficial to the timely triggering and sending of the non-periodic DRS, thereby being beneficial to the timely measurement requirement based on the non-periodic DRS.

Example 2: both periodic DRSs and aperiodic DRSs are transmitted based on LBT. The method mainly considers scenes which do not support SCS mechanism.

Example 3: the aperiodic DRS is transmitted based on LBT, and the periodic DRS is not transmitted based on LBT. Wherein the periodic DRS may be transmitted based on a short control information (SCS) manner; and/or, the periodic DRS is accompanied with user data transmission, and a special LBT for the periodic DRS transmission is not required. The method mainly utilizes the characteristics that the period of the periodic DRS transmission is long and the duration of each burst is short, and the transmission occupied duration can be controlled within the time delay requirement range of the SCS.

Example 4: the above embodiments 1 to 3 mix the transmission in different ways to provide more flexibility and obtain more transmission opportunities.

Example 5: the LBT implementation method of the DRS comprises the following steps: (1) setting the end position of the contention window at a preset DRS transmission time point; or, (2) the random backoff value ends at a point of time when the nearby preconfigured DRS candidate is transmitted. The method can improve the priority of DRS preemption and improve the sending chance.

By adopting the technical scheme of the embodiment of the invention, the transmission of the synchronous signal of the unauthorized carrier is realized by configuring at least one parameter of the time parameter, the frequency domain position and the composition parameter in the DRS transmission pattern, and the characteristics of the opportunity occupation and the continuous occupation requirement of the unauthorized carrier can be met.

Example two

The embodiment of the invention also provides a base station. Fig. 11 is a schematic structural diagram of a base station according to a second embodiment of the present invention, and as shown in fig. 11, the base station includes: a configuration unit 21 and a transmission unit 22; the configuration unit 21 is configured to configure a discovery reference signal DRS transmission pattern; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain positions, composition parameters;

the transmitting unit 22 is configured to transmit the DRS based on a configured DRS transmission pattern, so that the DRS has periodicity and/or persistence, or aperiodicity and/or persistence.

Specifically, as a first implementation manner, the configuring unit 21 is configured to configure, when a DRS is in a first half frame of a radio frame, the DRS to be formed by using a reference signal structure based on a first preset subframe; and/or configuring the DRS to be formed by a reference signal structure based on a second preset subframe when the DRS is positioned in the second half frame of the wireless frame. Wherein the first preset subframe may be subframe 0; the second preset subframe may be subframe 5.

Specifically, the present embodiment has the following preferred examples:

example 1: the DRS transmitted from a subframe 0 to a subframe 4 in a wireless frame is formed by adopting a Reference Signal (RS) structure based on the subframe 0; correspondingly, the DRS transmitted in the subframe 5 to the subframe 9 in the radio frame is formed by an RS structure based on the subframe 5. As shown in fig. 2, when the DRS is in subframe 2, the DRS is formed by using an RS structure of subframe 0; correspondingly, when the DRS is in subframe 6, the DRS is formed by using an RS structure of subframe 5.

Example 2: when TDD is adopted and the DRS is formed on the basis of a PSS/SSS structure, the DRS sent from a subframe 0 to a subframe 4 in a radio frame is formed by the SSS of the subframe 0 and the PSS of the subframe 1; correspondingly, the DRS transmitted in subframes 5 to 9 in one radio frame is formed by the SSS in subframe 5 and the PSS in subframe 6.

Example 3: when FDD is adopted and the DRS is formed on the basis of a PSS/SSS structure, the DRS sent from a subframe 0 to a subframe 4 in a radio frame is formed by the PSS/SSS structure of the subframe 0; correspondingly, the DRS transmitted in one radio frame from subframe 5 to subframe 9 is constructed by adopting the PSS/SSS structure of subframe 5.

As a second implementation manner, the configuring unit 21 is configured to configure the DRS within a DRS time window; the DRS time window has a preconfigured time domain location and time domain length.

The DRS time window adopts preset configuration parameters; the preset configuration parameter may be a configuration parameter of a DRS burst in LTE R12 release, and a duration of the DRS time window in the FDD system may be 1 to 5 milliseconds (ms); the DRS time window may have a duration of 2 to 5ms in a TDD system.

The embodiment keeps the original pilot frequency measurement parameters and/or behaviors unchanged. In addition, the DRS parameter in the prior art, which refers to the duration of one DRS burst of R12 in the prior art and now refers to the time window range of one DRS burst that may occur, may also be used; the preemption and transmission are limited within this range, which also facilitates the range limitation of the UE blind detection, not any position.

In this embodiment, as an implementation manner, if the predetermined length of the DRS burst exceeds the DRS time window, the processing manner may refer to the processing manner listed in the first embodiment, and is not specifically described in this embodiment.

As a third implementation manner, the configuration unit 21 is configured to, when a starting subframe occupied by the DRS is an odd subframe or an even subframe, adopt a configuration manner corresponding to the odd subframe or the even subframe;

As a fourth embodiment, the configuration unit 21 is configured to, when a starting orthogonal frequency division multiplexing OFDM symbol occupied by a DRS burst is an odd symbol or an even symbol, adopt a transmission mode corresponding to the odd symbol or the even symbol;

As a fifth implementation manner, the configuring unit 21 is configured to configure the DRS and/or the reservation signal according to a preset rule;

In this approach, the DRS is transmitted when the LBT successfully starts to camp on. Specifically, when the starting position of the DRS is an OFDM symbol edge, in order to control the DRS to be aligned with the starting OFDM symbol edge, the following several manners may be adopted: 1. controlling DRS burst structure translation to align with the starting OFDM symbol; 2. and controlling the DRS burst structure and the limited OFDM symbol as a starting transmission position, and intercepting the rest part of the DRS burst structure after the starting OFDM symbol starts. In the second mode, the DRS with the partial burst structure reserved can still be measured due to the complete OFDM symbol. For example, when the mapping start point of the DRS burst structure is symbol n and the start point occupied by a carrier is symbol n +1, the component corresponding to symbol n of the DRS structure is removed, and only symbol n +1 and its subsequent components in the DRS structure are transmitted.

In order to ensure that the DRS is aligned with the edge of the OFDM symbol, the following control methods may be adopted: 1. limiting the LBT of the DRS; preferably, LBT is performed before OFDM symbols, and after successful LBT preemption, the LBT of a frame structure based device (FBE) may be adopted to start the preemption at the OFDM symbol edge; 2. when the starting position of the DRS burst is in the middle of the ith OFDM symbol (for example, the remaining length of the DRS burst excluding the ith OFDM symbol is L), controlling the second half of the DRS burst structure on the (i + 1) th OFDM symbol (i.e., the part of the DRS with the remaining length of L) to be copied on the ith OFDM symbol. The method is equivalent to lengthening the length of a Cyclic Prefix (CP) on the (i + 1) th OFDM; or, the CP length of the (i + 1) th OFDM symbol is lengthened to the occupied starting point of the nth OFDM symbol. By extending the CP length, synchronization requirements can be reduced, thereby improving detection performance.

Scene two: and at least transmitting the reserved signal with the time length of T, enabling the ending position of the reserved signal with the time length of T to be an OFDM symbol edge, and then configuring and transmitting the DRS, namely starting to transmit the DRS through a complete OFDM symbol. The method can obtain better initial synchronization, Automatic Gain Control (AGC) and the like by using the reserved signal so as to better perform DRS measurement.

Scene three: a DRS structure starting OFDM symbol is limited on at least one OFDM symbol; configuring a reservation signal to last from an occupied starting point until the at least one OFDM symbol edge defined by the DRS structure. Preferably, when a starting point defined by the DRS structure has a plurality of options, if a distance between the occupied starting point and a position defined by a jth DRS structure is greater than or equal to a predetermined time period t, a reservation signal is configured to be continued to the position defined by the jth DRS structure; and if the distance between the occupied starting point and the position defined by the jth DRS structure is less than the preset time length t, configuring a reserved signal to be continuous to the position defined by the jth +1 DRS structure. Therefore, the reserved signal with a certain time length can be ensured, and better initial synchronization, AGC and the like can be obtained by utilizing the reserved signal so as to better perform DRS measurement.

As a sixth implementation manner, the configuring unit 21 is configured to configure, according to a first preset configuration manner, that the DRS occupies the system bandwidth in the frequency domain; wherein, configuring the DRS according to the first preset configuration mode to occupy the system bandwidth in the frequency domain includes: configuring a system bandwidth DRS frequency domain pattern according to a preset unit DRS frequency domain pattern; or respectively configuring DRS frequency domains with different bandwidths according to a preset rule; or configuring a conventional PSS/SSS structure in a preset RB of a frequency domain middle frequency band, and configuring other signals in RBs on two sides of the preset RB according to a preset configuration mode.

mode 1: configuring a system bandwidth DRS frequency domain pattern according to a preset unit DRS frequency domain pattern (such as a 5MHzDRS frequency domain pattern);

mode 2: respectively configuring DRS frequency domain patterns with different bandwidths according to preset rules;

mode 3: configuring a conventional PSS/SSS in a preset RB of a frequency domain middle frequency band, and configuring other signals in RBs on two sides of the preset RB according to a preset configuration mode;

the DRS frequency domain pattern configuration manners of the

manners

As a seventh implementation manner, the configuring unit 21 is configured to configure, according to a second preset manner, that the DRS is transmitted simultaneously or non-simultaneously with user data; wherein, configuring the DRS and the user data to be transmitted simultaneously or non-simultaneously according to a second preset mode includes: when a DRS transmission pattern in a first preset time domain is consistent with a DRS transmission pattern in a second preset time domain, configuring the DRS to transmit with user data at the same time or at different times; or when the DRS transmission pattern in the first preset time domain and the DRS transmission pattern in the second preset time domain are not consistent, configuring the DRS to transmit simultaneously or non-simultaneously with the user data.

scene 1: a scene in which a DRS transmission pattern in the first preset time domain and a DRS transmission pattern in the second preset time domain are inconsistent, that is, a scene in which a transmission pattern of DRS is inconsistent in a time domain with a duration of T1 and a time domain with a duration of T2; the scene comprises the following embodiments:

In a manner that the DRS transmission pattern in the first preset time domain is inconsistent with the DRS transmission pattern in the second preset time domain, the UE needs to assume two possible DRS structures, which may be based on detection measurement; the system may also be selected to display a DRS structure used for notifying the UE currently, for example, whether there is data to be transmitted simultaneously or only select to notify the change of the DRS structure, and whether there is data to be transmitted simultaneously is transparent to the UE.

Further, when DRSs are transmitted together with user data, the DRSs cannot be mapped to REs in which demodulation reference signals (DMRSs) are located; the REs where the Physical Broadcast Channel (PBCH) is transmitted cannot be mapped.

As an eighth implementation manner, the configuring unit 21 is configured to configure the DRS as a periodic or aperiodic transmission manner; wherein the configuring the DRS as a periodic transmission mode includes: the DRS transmission pattern is in a static or semi-static configuration; the semi-static configuration represents that the DRS transmission pattern does not change in a preset period; the configuring the DRS in an aperiodic transmission manner includes: DRS sends dynamic configuration of pattern, the DRS is triggered based on dynamic signaling.

When the aperiodic DRS is used for channel occupation, there are two scenarios:

Example 2: as shown in fig. 9, a part of the timeslot resources T1 in the middle of the data structure is empty, and the aperiodic DRS is configured to be continuously occupied on the resource where the timeslot resource T1 is located to transmit the aperiodic DRS, so as to achieve the purpose of channel occupation, and thus, the timeslot resource T1 can be prevented from being occupied by idle loading considered by other nodes.

As a ninth implementation manner, the configuring unit 21 is configured to configure SRS accompanied DRS transmission; the configuring SRS to accompany DRS transmission includes: configuring the SRS and DRS of a serving cell in which the UE is located to transmit concomitantly; or configuring the SRS and the non-periodic DRS of the serving cell in which the UE is located to transmit concomitantly; or configuring the SRS to be transmitted along with periodic DRSs of a serving cell and a neighbor cell where the UE is located; or, configuring SRS accompanying DRS transmission based on the signaling indication.

Here, CSI for DL and UL, which is used for scheduling of adjacent DL and/or UL, may be obtained using channel reciprocity, respectively.

Specifically, based on DRS transmission requirements, the eNB performs carrier preemption. As shown in fig. 10, the occupancy duration is set to T1+ T2; wherein, T2 is used for a User Equipment (UE) to transmit SRS to a base station; t1 is used for the base station to send DRS to the UE; t2 is immediately adjacent to T1. Here, the UE transmits the SRS to the base station at time T2 immediately after time T1 at which the DRS is received. On one hand, in order to ensure that the time interval between DL and UL is small enough, SRS transmission is advanced as much as possible; on the other hand, to improve the accuracy of the measurement, the SRS may repeatedly transmit a plurality of OFDM symbols. Preferably, the SRS occupies at least 80% of the nominal system bandwidth.

1. the SRS is transmitted along with the DRS of the serving cell where the UE is located, but not the DRSs of other neighbor cells;

2. aperiodic DRS carrier preemption and transmission may be triggered. Preferably, only the UE of the serving cell is notified for the UE within the serving cell, while UEs of other neighbor cells may not know the aperiodic DRS. Triggering aperiodic DRS transmission may be used for at least one of the following purposes: CSI measurement, synchronization measurement requirements, requirements for SRS transmission.

The trigger transmission time is preferably an aperiodic SRS.

or, allowing transmission of the DRS and/or SRS.

Here, the UE performs LBT at a time when the DRS may appear, and since the base station of the LAA already occupies and transmits the DRS, the probability that the UE seizes successfully immediately following the DRS transmission time is high.

As a tenth embodiment, the configuring unit 21 is configured to configure a broadcast channel to accompany DRS transmission; wherein the configuring the broadcast channel to transmit with the DRS includes: configuring a broadcast channel to be transmitted along with a periodic DRS, wherein an aperiodic DRS is not transmitted along with the broadcast channel; or configuring the broadcast channel starting OFDM symbol to be the same as a first group PSS/SSS starting OFDM symbol of a DRS component; or configuring the number of antenna ports corresponding to the broadcast channel to be consistent with the number of antenna ports corresponding to CRS components in DRS; or configuring a broadcast channel to transmit on an OFDM symbol where CRS components in DRS are located and/or an OFDM symbol adjacent to the CRS; or configuring a broadcast channel to be transmitted on at least one carrier in a predefined carrier group, and not configuring other carriers to transmit the broadcast channel.

Further, the sending unit 22 is configured to control, based on the configured DRS sending pattern, the periodic DRS and/or the aperiodic DRS to send based on listen before talk LBT in a third preset manner; or controlling the periodic DRS and/or the aperiodic DRS not to be transmitted based on the LBT according to a fourth preset mode.

The method specifically comprises the following implementation modes:

example 1: the periodic DRS is transmitted based on LBT, and the aperiodic DRS is not transmitted based on LBT. Wherein the aperiodic DRS may be transmitted based on a short control information (SCS) manner; and/or, the aperiodic DRS is accompanied by user data transmission, and does not need to perform special LBT specially for the aperiodic DRS transmission. The method is beneficial to the timely triggering and sending of the non-periodic DRS, thereby being beneficial to the timely measurement requirement based on the non-periodic DRS.

In this embodiment, the configuration Unit 21 in the base station may be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or a Programmable Gate Array (FPGA) in the base station in practical application; the transmitting unit 22 in the base station may be implemented by a transmitter or a transmitting antenna in the base station in practical applications.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method for transmitting a synchronization signal of an unlicensed carrier, the method comprising:

a base station configures a DRS (discovery reference signal) transmission pattern; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain positions, composition parameters;

transmitting the DRS based on a configured DRS transmission pattern such that the DRS is persistent and periodic or aperiodic; wherein,

the configuring the DRS transmission pattern includes: when the DRS is positioned in the first half frame of a wireless frame, configuring the DRS to be formed by adopting a reference signal structure based on a first preset subframe, wherein the first preset subframe is a subframe 0; and/or when the DRS is in the second half frame of the wireless frame, configuring the DRS to be formed by adopting a reference signal structure based on a second preset subframe, wherein the second preset subframe is a subframe 5;

or, the configuring the DRS transmission pattern includes: and configuring a conventional PSS/SSS structure in a preset RB of a frequency domain middle frequency band, and configuring other signals in RBs on two sides of the preset RB according to a preset configuration mode.

2. The method of claim 1, wherein transmitting the DRS based on the configured DRS transmission pattern comprises: configuring a broadcast channel to accompany DRS transmission;

the configuring the broadcast channel to transmit with the DRS includes:

3. The method of claim 1, wherein transmitting the DRS based on the configured DRS transmission pattern comprises: based on the configured DRS transmission pattern, controlling the periodic DRS and/or the non-periodic DRS to be transmitted based on listen before talk LBT according to a third preset mode; or controlling the periodic DRS and/or the aperiodic DRS not to be transmitted based on the LBT according to a fourth preset mode.

4. A base station, characterized in that the base station comprises: a configuration unit and a transmission unit; wherein,

the configuration unit is configured to configure a discovery reference signal DRS transmission pattern; the DRS transmission pattern comprises at least one of the following parameters: time parameters, frequency domain positions, composition parameters;

the transmitting unit is configured to transmit the DRS based on a configured DRS transmission pattern, so that the DRS has persistence and is periodic or aperiodic; wherein,

the configuration unit is configured to configure, when the DRS is in a first half frame of a radio frame, the DRS to be formed by using a reference signal structure based on a first preset subframe, where the first preset subframe is subframe 0; and/or when the DRS is in the second half frame of the wireless frame, configuring the DRS to be formed by adopting a reference signal structure based on a second preset subframe, wherein the second preset subframe is a subframe 5;

or the configuration unit is configured to configure a conventional PSS/SSS structure in a preset RB of a frequency domain middle band, where RBs on two sides of the preset RB configure other signals in a preset configuration manner.

5. The base station of claim 4, wherein the configuring unit is configured to configure a broadcast channel to transmit with the DRS; wherein the configuring the broadcast channel to transmit with the DRS includes: configuring a broadcast channel to be transmitted along with a periodic DRS, wherein an aperiodic DRS is not transmitted along with the broadcast channel; or configuring the broadcast channel starting OFDM symbol to be the same as a first group PSS/SSS starting OFDM symbol of a DRS component; or configuring the number of antenna ports corresponding to the broadcast channel to be consistent with the number of antenna ports corresponding to CRS components in DRS; or configuring a broadcast channel to transmit on an OFDM symbol where CRS components in DRS are located and/or an OFDM symbol adjacent to the CRS; or configuring a broadcast channel to be transmitted on at least one carrier in a predefined carrier group, and not configuring other carriers to transmit the broadcast channel.

6. The base station of claim 4, wherein the transmitting unit is configured to control, based on the configured DRS transmission pattern, the periodic DRS and/or the aperiodic DRS to transmit based on listen before talk, LBT, in a third preset manner; or controlling the periodic DRS and/or the aperiodic DRS not to be transmitted based on the LBT according to a fourth preset mode.

7. A storage medium storing a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 3 when executed by a processor.