CN110945942A

CN110945942A - Method, device and terminal for determining DRS window in NR-U

Info

Publication number: CN110945942A
Application number: CN201980002919.5A
Authority: CN
Inventors: 刘洋
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-03-31
Anticipated expiration: 2039-11-04
Also published as: CN110945942B; WO2021087673A1

Abstract

The disclosure provides a method, a device and a terminal for determining a DRS window in NR-U, wherein the method comprises the following steps: receiving window hint information, wherein the window hint information is used for implicitly indicating the window length of a DRS window; receiving an SSB according to the window length; wherein the DRS window corresponds to at least two candidate window lengths.

Description

Method, device and terminal for determining DRS window in NR-U

Technical Field

The present application relates to the field of mobile communications, and in particular, to a method, an apparatus, and a terminal for determining a DRS window in an NR-U.

Background

The 5G (5 th generation mobile communication system) has made a research on unlicensed spectrum, and proposes a scheme for supporting independent networking of 5G unlicensed cells. In the design of a 5G unlicensed spectrum independent network (NR-U), the first step is to consider the design of a synchronous broadcast BLOCK (SS/PBCH BLOCK, SSB). For unlicensed spectrum, the LBT (listen before talk) principle needs to be adhered to. When the base station needs to transmit the SSB to the terminal, under the LBT principle, the SSB may not be transmitted at the position fixedly configured by the system because the time-frequency resource is occupied. At this time, it may try to send SSB again at an alternative offset transmission location (SSB shifting) allowed by the system, so that the User Equipment (UE) is synchronized with the network side in time.

The DRS window is a window for transmitting SSBs, and in the related art, the DRS window is defined to be 5ms, that is, in a scene where a subcarrier interval is 30kHZ, the maximum number of SSBs that can be transmitted is 20. However, if only 1 or 2 SSBs are transmitted, other candidate transmission positions in the DRS window will be lost during rate matching, which wastes system resources.

Disclosure of Invention

The embodiment of the application provides a method, a device, a terminal and a storage medium for determining a DRS window in an NR-U, which can be used for solving the problem that if only 1 or 2 SSBs are transmitted, other candidate transmission positions in the DRS window are lost when the rate is matched, and system resources are wasted. The technical scheme is as follows:

in one aspect, a Discovery Reference Signal (DRS) window determination method in an NR-U is provided, the method comprising:

receiving window hint information, wherein the window hint information is used for implicitly indicating the window length of a DRS window;

receiving an SSB according to the window length;

wherein the DRS window corresponds to at least two candidate window lengths.

In another aspect, a method for determining a DRS window in an NR-U is provided, the method including:

generating window hint information, wherein the window hint information is used for implicitly indicating the window length of a DRS window;

sending the window hint information;

transmitting the SSB in a DRS window having the window length.

In another aspect, an apparatus for DRS window determination in NR-U is provided, the apparatus comprising:

a receiving module configured to receive window implicit information for implicitly indicating a window length of a Discovery Reference Signal (DRS) window;

the processing module is used for receiving the SSB according to the window length;

wherein the DRS window corresponds to at least two candidate window lengths.

sending the window hint information;

transmitting the SSB in a DRS window having the window length.

In another aspect, a terminal is provided, which includes:

a processor;

a transceiver coupled to the processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the method for DRS window determination in NR-U as described above.

In another aspect, a network-side device is provided, where the network-side device includes:

a processor;

a transceiver coupled to the processor;

a memory for storing executable instructions of the processor;

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

and by providing the window lengths of at least two DRS windows, the terminal determines the window length of the DRS in the current transmission by using the window hint information, and receives the SSB in the window length. For the scene of transmitting more SSBs, a larger DRS window is used; for scenarios where fewer SSBs are sent, a smaller DRS window is used. Namely, different quantities of SSBs are sent by using a reasonable DRS window, thereby avoiding wasting system resources.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a block diagram of a communication system provided in an exemplary embodiment of the present application;

fig. 2 is a flowchart of a method for determining a DRS window in an NR-U according to an exemplary embodiment of the present application;

fig. 3 is a flowchart of a method for determining a DRS window in an NR-U according to another exemplary embodiment of the present application;

FIG. 4 is a schematic diagram of the structure of a first indicator domain provided by another exemplary embodiment of the present application;

fig. 5 is a schematic structural diagram of an apparatus for determining a DRS window in an NR-U according to an exemplary embodiment of the present application;

fig. 6 is a schematic structural diagram of an apparatus for determining a DRS window in an NR-U according to another exemplary embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal provided in an exemplary embodiment of the present application;

fig. 8 is a schematic structural diagram of a base station according to another exemplary embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a block diagram illustrating a communication system operating in an unlicensed frequency band according to an exemplary embodiment of the present disclosure, where the communication system may include: an access network 12 and a terminal 13.

Several access network devices 120 are included in access network 12. The access network equipment 120 may be a base station, which is a device deployed in an access network to provide wireless communication functions for terminals. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In the 5G NR-U system, a device having a base station function is called a gbnodeb or a gNB. The description of "base station" may change as communication technology evolves.

The terminal 13 may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication capability, as well as various forms of user equipment, Mobile Stations (MSs), terminals (terminal devices), and so forth. For convenience of description, the above-mentioned devices are collectively referred to as a terminal. The access network device 120 and the terminal 13 communicate with each other through some air interface technology, for example, a Uu interface.

It should be noted that, the following exemplary embodiments of the present disclosure only exemplify a terminal accessing an access network device, and after understanding the technical solutions of the present disclosure, those skilled in the art will easily think that the configuration method of the physical random access channel provided in the present disclosure is a configuration method of other physical random access channels that are evolved later, and is applied to a case where other terminals access other access network devices, but these extension solutions should be included in the protection scope of the present disclosure.

Fig. 2 shows a flowchart of a method for determining a DRS window in an NR-U according to an exemplary embodiment of the present disclosure. The method may be performed by a terminal, the method comprising:

step 202, receiving window hinting information, wherein the window hinting information is used for implicitly indicating the window length of a DRS window, and the DRS window corresponds to at least two candidate window lengths;

the DRS window is a time domain window for transmitting a DRS signal. The DRS signal includes SSBs.

In one example, the DRS window includes two candidate window lengths. For example, one window length is 5ms and the other window length is 2.5 ms. For another example, one window length is 5ms and the other window length is 2 ms.

In one example, the DRS window includes more than three candidate window lengths. The maximum window length is 5ms, and the other candidate window lengths are all less than 5ms and are multiples of 0.5 ms. For example, candidate window lengths include: 5ms, 2.5ms, 2ms, 1.5ms, 1ms, or 0.5 ms.

And the terminal receives window hint information sent by the access network equipment, and acquires the window length of the DRS window according to the window hint information.

In one example, the window implicit information is implicitly indicated by the send position indication information of the SSB; in another example, the window implicit information is implicitly indicated by the transmit position indication information of the SSB in conjunction with the QCL.

Step 204, receiving the SSB according to the window length.

After determining the window length of the DRS window, the SSB is received in a DRS window having the window length.

In one example, a terminal receives 4n or 8n SSBs in a DRS window of 5ms in window length; 1n or 2n SSBs are received in a DRS window having a window length of less than 5 ms. n is the number of SSBs transmitted in a single beam, n is a positive integer, for example, n is 1.

In summary, in the method provided in this embodiment, by providing at least two window lengths of DRS windows, the terminal determines the window length of the DRS in the current transmission by using the window hint information, and receives the SSB in the window length. For the scene of transmitting more SSBs, a larger DRS window is used; for scenarios where fewer SSBs are sent, a smaller DRS window is used. Namely, different quantities of SSBs are sent by using a reasonable DRS window, thereby avoiding wasting system resources.

In an optional embodiment based on fig. 2, the window indication information includes transmission location indication information of the SSB, where the transmission location indication information includes a first indication field and a second indication field, and when the second indication field is missing, the window length of the DRS window is determined to be a first length, and the first length is a maximum value of at least two candidate window lengths.

Illustratively, the SSB transmission position indication Information is an SSB-positioning inburst Information Element (IE) carried in minimum System residual Information (RMSI)

Wherein, SEQUENCE represents a SEQUENCE structure, inoneegroup is a first indication domain, and the first indication domain is a bit string occupying 8 bits; grouppinse is a second indication field, which is a bit string occupying 8 bits. That is, the first indication field is the first 8 bits of the SSB location indication information, and the second indication field is the last 8 bits of the SSB location indication information. Wherein the second indication field is an optional information field.

The structure of the SSB-PositionInBurst information element in Radio Resource Control (RRC) is slightly different from the above structure (only the number of bits is different), but the same applies.

Wherein, shortBitmap represents a short bitmap occupying 4 bits, mediabitmap represents a medium bitmap occupying 8 bits, and longBitmap represents a long bitmap occupying 64 bits.

For the case where the window length of the DRS window is two lengths:

in another optional embodiment based on fig. 2, the window indication information includes: the sending Location indication information of the SSB includes a first indication field and a second indication field, and a Quasi-Co-Location (QCL).

And when the second indication domain exists and the QCL is 1 or 2, determining the window length of the DRS window to be a second length, wherein the second length is 2.5ms or 2 ms.

For the case where the window length of the DRS window is more than three:

in another optional embodiment based on fig. 2, the window indication information includes: and the sending position indication information of the SSB comprises a first indication field and a second indication field.

And when the second indication domain exists, determining that the window length of the DRS window is a third length according to the value of the second indication domain, wherein the third length is the length except the first length in the window lengths of at least two candidates, and the lengths except the first length in the window lengths of the at least two candidates are all smaller than 5ms and are multiples of 0.5 ms.

In an illustrative example, the first table shows a correspondence between a value of the second indication field and a window length of the DRS window.

Watch 1

Value of the second indication field (groupPresence)	Window length of DRS window
		00000001	4ms
00000010	2.5ms
		00000011	2ms
00000100	1ms

The above table one is only an exemplary illustration, and the application does not limit the correspondence between the value of the second indication field and the window length of the DRS window.

Fig. 3 shows a flowchart of a method for determining a DRS window in an NR-U according to an exemplary embodiment of the present disclosure. The method may be performed by a base station, the method comprising:

step 302, generating window hint information, wherein the window hint information is used for implicitly indicating the window length of a DRS window;

Step 304, sending window hint information;

step 306, transmitting SSB in DRS window with window length;

after determining the window length of the DRS window, the SSB is transmitted in the DRS window having the window length.

In one example, the base station transmits 4n or 8n SSBs in a DRS window with a window length of 5 ms; transmitting 1n or 2n SSBs in a DRS window with a window length of less than 5 ms. n is the number of SSBs transmitted in a single beam, n is a positive integer, for example, n is 1.

In an alternative embodiment based on fig. 3, the window hint information includes: the SSB sends position indication information, wherein the sending position indication information comprises a first indication domain and a second indication domain, and the second indication domain is absent;

and the second indication field is used for implicitly indicating that the window length of the DRS window is the first length, and the first length is the maximum value of the window lengths of at least two candidate types.

The first indication field is the first 8 bits in the location indication information of the SSB, and the second indication field is the last 8 bits in the location indication information of the SSB.

For the case where the window length of the DRS window is two lengths:

in an alternative embodiment based on fig. 3, the window hint information includes: and sending position indication information and quasi co-location information QCL of the SSB, wherein the sending position indication information comprises a first indication domain and a second indication domain. And the second indication domain and the QCL are used for implicitly indicating that the window length of the DRS window is the second length.

Illustratively, the first length is 5ms and the second length is 2.5ms or 2 ms.

For the case where the window length of the DRS window is more than three:

in an alternative embodiment based on fig. 3, the window hint information includes: the SSB sends position indication information, wherein the sending position indication information comprises a first indication domain and a second indication domain;

and the value of the second indication field is used for implicitly indicating that the window length of the DRS window is the third length. And different values of the second indication domain correspond to different third lengths, and the third lengths are lengths except the first lengths in at least two candidate window lengths.

For example, the first length is 5ms, and the lengths of the at least two candidate window lengths except the first length are each less than 5ms and are multiples of 0.5 ms.

It should be noted that, in one possible embodiment, 1 bit in the first indication field in the transmission location indication information of the SSB may also be used to indicate that the window length of the DRS window is a variable length (or a fixed length). The 1 bit is the corresponding bit of the current SSB in the first indication field. Wherein, the current SSB is the SSB which is received by the terminal and carries the SSB-PositionInBurst.

As shown in fig. 4, the first action is a first indication field, the second action is a second indication field, and a square represents 1-bit indication information and also represents a time-frequency resource (hereinafter referred to as a timeslot block) corresponding to a synchronization broadcast block. The numeral 1 indicates that there is a sync broadcast block transmission on the time frequency resource, and the shading indicates the currently received sync broadcast block. That is, the current SSB is SSB 5.

Since the current SSB is definitely received by the UE, the bit value of the shaded square shown in fig. 4 may be used to implicitly indicate other information, for example, when the bit value is 0, it represents that the DRS window supports a variable length, and when the bit value is 1, it represents that the DRS window is a fixed length.

Fig. 5 is a block diagram illustrating an apparatus for determining a DRS window in an NR-U according to an exemplary embodiment of the present application. The device comprises:

a receiving module 520 configured to receive window implicit information for implicitly indicating a window length of a discovery reference signal DRS window;

a processing module 540, configured to receive a synchronization signal block SSB according to the window length;

wherein, the DRS corresponds to at least two candidate window lengths.

In an optional embodiment, the receiving module 520 is configured to receive the sending location indication information of the SSB, where the sending location indication information includes a first indication field and a second indication field;

the processing module 540 is configured to determine that the window length of the DRS window is the first length when the second indication field is missing; the first length is a maximum of the at least two candidate window lengths.

In an alternative embodiment, the DRS window has a window length of two,

the receiving module 520, further configured to receive a quasi co-located QCL;

the processing module 540 is further configured to determine that the window length of the DRS window is the second length when the second indication field is present and the value of the QCL is 1 or 2.

In an alternative embodiment, the first length is 5ms,

the second length is 2.5ms or 2 ms.

In an optional embodiment, the window length of the DRS window is three or more;

the processing module 540 is further configured to determine, when the second indication field exists, according to a value of the second indication field, that the window length of the DRS window is a third length;

wherein different values of the second indication field correspond to different third lengths, and the third length is a length of the at least two candidate window lengths except the first length.

In an alternative embodiment, the first length is 5ms, and the lengths of the at least two candidate window lengths other than the first length are each less than 5ms and are multiples of 0.5 ms.

In an optional embodiment, the first indication field is the first 8 bits of the location indication information of the SSB, and the second indication field is the last 8 bits of the location indication information of the SSB.

Fig. 6 is a block diagram illustrating an apparatus for determining a DRS window in an NR-U according to an exemplary embodiment of the present application. The device comprises:

a generating module 620 configured to generate window hint information for implicitly indicating a window length of a DRS window;

a sending module 640 configured to send the window hint information;

the transmitting module 640 is configured to transmit the SSB in a DRS window having the window length.

In an alternative embodiment, the window hint information includes:

sending location indication information of the SSB, wherein the sending location indication information comprises a first indication domain and a second indication domain, and the second indication domain is missing;

the second indication field is configured to implicitly indicate that a window length of the DRS window is a first length, where the first length is a maximum value of the at least two candidate window lengths.

In an alternative embodiment, the window hint information includes:

sending location indication information and quasi co-location information QCL of the SSB, wherein the sending location indication information comprises a first indication domain and a second indication domain, and the value of the QCL is 1 or 2;

the second indication field and the QCL are configured to implicitly indicate that the window length of the DRS window is a second length.

In an alternative embodiment, the first length is 5ms and the second length is 2.5ms or 2 ms.

In an optional embodiment, the window length of the DRS window is three or more, and the window hint information includes:

sending location indication information of the SSB, wherein the sending location indication information comprises a first indication domain and a second indication domain;

the value of the second indication field is used for implicitly indicating that the window length of the DRS window is a third length;

Fig. 7 is a schematic structural diagram of a terminal according to an exemplary embodiment of the present application, where the terminal includes: a processor 701, a receiver 702, a transmitter 703, a memory 704, and a bus 705.

The processor 701 includes one or more processing cores, and the processor 701 executes various functional applications and information processing by executing software programs and modules.

The receiver 702 and the transmitter 703 may be implemented as one communication component, which may be a communication chip.

The memory 704 is coupled to the processor 701 by a bus 705.

The memory 704 may be configured to store at least one instruction, which the processor 701 is configured to execute to implement the various steps in the above-described method embodiments.

Further, the memory 704 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), Static Random Access Memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM).

In an exemplary embodiment, a computer readable storage medium is further provided, and at least one instruction, at least one program, a set of codes, or a set of instructions is stored in the computer readable storage medium, and the at least one instruction, the at least one program, the set of codes, or the set of instructions is loaded and executed by the processor to implement the steps performed by the terminal in the method for determining the DRS window in NR-U provided by the above-mentioned various method embodiments.

Fig. 8 is a schematic structural diagram of a base station according to an exemplary embodiment of the present application, where the base station includes: a processor 801, a receiver 802, a transmitter 803, a memory 804 and a bus 805.

The processor 801 includes one or more processing cores, and the processor 801 executes various functional applications and information processing by running software programs and modules.

The receiver 802 and the transmitter 803 may be implemented as one communication component, which may be a piece of communication chip.

The memory 804 is coupled to the processor 801 by a bus 805.

The memory 804 may be configured to store at least one instruction, and the processor 801 is configured to execute the at least one instruction to implement the steps performed by the base station in the method for determining the DRS window in NR-U in the above-described method embodiment.

Further, the memory 804 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), Static Random Access Memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM).

In an exemplary embodiment, a computer readable storage medium is further provided, and at least one instruction, at least one program, a set of codes, or a set of instructions is stored in the computer readable storage medium, and the at least one instruction, the at least one program, the set of codes, or the set of instructions is loaded and executed by the processor to implement the DRS in NR-U window determination method performed by a base station provided in the foregoing various method embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for determining a DRS window of a discovery reference signal in an NR-U, the method comprising:

receiving a Synchronization Signal Block (SSB) according to the window length;

wherein the DRS window corresponds to at least two candidate window lengths.

2. The method of claim 1, wherein receiving window hint information comprises:

receiving sending position indication information of the SSB, wherein the sending position indication information comprises a first indication domain and a second indication domain;

when the second indication field is absent, determining the window length of the DRS window to be a first length; the first length is a maximum of the at least two candidate window lengths.

3. The method of claim 2, wherein the DRS window has a window length of two, and wherein the method further comprises:

receiving a quasi co-located QCL;

and when the second indication domain exists and the value of the QCL is 1 or 2, determining the window length of the DRS window to be a second length.

4. The method of claim 3, wherein the first length is 5ms and the second length is 2.5ms or 2 ms.

5. The method of claim 2, wherein the DRS window has a window length of three or more, and wherein the method further comprises:

when the second indication domain exists, determining the window length of the DRS window to be a third length according to the value of the second indication domain;

6. The method of claim 5, wherein the first length is 5ms, and wherein the at least two candidate window lengths except the first length are each less than 5ms and are multiples of 0.5 ms.

7. The method according to any one of claims 2 to 6,

the first indication field is the first 8 bits of the location indication information of the SSB, and the second indication field is the last 8 bits of the location indication information of the SSB.

8. A method for determining DRS window in NR-U is characterized in that the method comprises the following steps:

sending the window hint information;

transmitting a synchronization signal block SSB in a DRS window having the window length.

9. The method of claim 8, wherein the window hint information comprises:

10. The method of claim 9, wherein the window hint information comprises:

11. The method of claim 10, wherein the first length is 5ms and the second length is 2.5ms or 2 ms.

12. The method of claim 9, wherein the DRS window has a window length of three or more, and wherein the window implicit information includes:

13. The method of claim 12, wherein the first length is 5ms, and wherein the at least two candidate window lengths other than the first length are each less than 5ms and are multiples of 0.5 ms.

14. The method according to any one of claims 8 to 13,

15. An apparatus for DRS window determination in NR-U, the apparatus comprising:

the processing module is used for receiving a synchronous signal block SSB according to the window length;

wherein, the DRS corresponds to at least two candidate window lengths.

16. The apparatus of claim 15,

the receiving module is configured to receive sending location indication information of the SSB, where the sending location indication information includes a first indication field and a second indication field;

the processing module is configured to determine a window length of the DRS window to be a first length when the second indication field is absent; the first length is a maximum of the at least two candidate window lengths.

17. The apparatus of claim 16, wherein the DRS window has a window length of two,

the receiving module is further configured to receive a quasi co-located QCL;

the processing module is further configured to determine that the window length of the DRS window is the second length when the second indication field is present and the value of the QCL is 1 or 2.

18. The apparatus of claim 17, wherein the first length is 5ms,

the second length is 2.5ms or 2 ms.

19. The apparatus of claim 15, wherein the DRS window has a window length of three or more;

the processing module is further configured to determine, when the second indication field exists, a window length of the DRS window to be a third length according to a value of the second indication field;

20. The apparatus of claim 19, wherein the first length is 5ms, and wherein the at least two candidate window lengths except the first length are each less than 5ms and are multiples of 0.5 ms.

21. The apparatus of any one of claims 15 to 20,

22. An apparatus for DRS window determination in NR-U, the apparatus comprising:

a generating module configured to generate window hint information for implicitly indicating a window length of a DRS window;

a sending module configured to send the window hint information;

the transmitting module is further configured to transmit a synchronization signal block SSB in a DRS window having the window length.

23. The apparatus of claim 22, wherein the window hint information comprises:

24. The apparatus of claim 23, wherein the window hint information comprises:

25. The apparatus of claim 24, wherein the first length is 5ms and the second length is 2.5ms or 2 ms.

26. The apparatus of claim 23, wherein the DRS window has a window length of three or more, and wherein the window implicit information comprises:

27. The apparatus of claim 26, wherein the first length is 5ms, and wherein the at least two candidate window lengths except the first length are each less than 5ms and are multiples of 0.5 ms.

28. The apparatus of any one of claims 22 to 27,

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

a processor;

a transceiver coupled to the processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the method of DRS in NR-U window determination of any one of claims 1 to 7.

30. A network side device, wherein the network side device comprises:

a processor;

a transceiver coupled to the processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the method of DRS in NR-U window determination of any one of claims 8 to 14.