CN112153671A

CN112153671A - Data transmission method and related equipment

Info

Publication number: CN112153671A
Application number: CN201910581312.9A
Authority: CN
Inventors: 许琼涛; 唐志华; 邓洲宇; 陈超
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Shanghai Huawei Technologies Co Ltd
Priority date: 2019-06-29
Filing date: 2019-06-29
Publication date: 2020-12-29
Anticipated expiration: 2039-06-29
Also published as: CN112153671B

Abstract

The embodiment of the application discloses a data transmission method and related equipment, wherein the method can be used for communication between a relay base station and a host base station in the relay field, and comprises the following steps: under the condition that the relay base station supports the short TTI, the relay base station selects at least one data packet from the short TTI queue and sends a first data packet in the at least one data packet to the host base station within a first time period, wherein the length of the first time period is less than 1 millisecond.

Description

Data transmission method and related equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a data transmission method and a related device.

Background

With the continuous development of communication technology, people put higher demands on the coverage of a cellular communication system and the capacity of a network link, and a relay technology is gradually popularized in order to convert a link with poor quality into a link with better quality to obtain higher capacity and coverage of the network link.

Relay technology (relay) is a wireless relay solution, and refers to that a data packet is not directly sent to an opposite party between a base station and a terminal device, but a donor base station (DeNB) sends the data packet to a Relay Node (RN), and the data packet is subjected to signal amplification or regeneration processing by the relay node and then forwarded to the terminal device.

However, in the process of using the relay base station for communication, a transmission delay is introduced when data is transmitted between the host base station and the relay base station, and the transmission rate of the data is reduced, so a scheme for improving the data transmission rate is urgently needed to be proposed.

Disclosure of Invention

The embodiment of the application provides a data transmission method and related equipment, which are used for providing a specific implementation scheme for applying a short TTI technology to communication between a host base station and a relay base station, shortening the communication time delay between the relay base station and the host base station and improving the support degree of low-delay services.

In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:

in a first aspect, an embodiment of the present application provides a data transmission method, which may be used in a scenario where a relay base station communicates with a donor base station, since there is a relay base station supporting a short TTI of transmission time interval among at least one relay base station connected to the donor base station, there is also a relay base station not supporting a short TTI, in case that the relay base station supports the short TTI, the relay base station may acquire at least one data packet from the short TTI queue, wherein the at least one data packet may be sent by the terminal device via at least one radio connection bearer, specifically, the at least one data packet may be received by the relay base station via one radio connection bearer, or may be received via at least two radio connection bearers, in the LTE wireless communication network, the radio connection bearer may be embodied as an evolved radio access bearer ERAB; further, the relay base station may send a first packet to the host base station within a first time period, where the first packet is one of the at least one packet, and the length of the first time period is less than 1 millisecond. In the implementation mode, the short TTI technology is applied to the communication process between the relay base station and the host base station, when the relay base station supports the short TTI, the relay base station is provided with a short TTI queue, the relay base station can acquire at least two first data packets to be transmitted from the short TTI queue and transmit two adjacent first data packets to the host base station within a first time period, and because the length of the first time period is less than 1 millisecond, compared with the common TTI technology adopted between the relay base station and the host base station, the communication time delay between the relay base station and the host base station is shortened, the data transmission rate is favorably improved, and the support degree of low-delay services is improved.

In one possible implementation manner of the first aspect, before the relay base station sends the first data packet to the donor base station within the first time period, the method further includes: since the relay base station receives at least one data packet sent by the terminal device through at least one radio access bearer, and when the terminal device needs to transmit service data of the first service, the relay base station requests to establish the first radio access bearer from the relay base station, and in the establishment process of the radio access bearer, the policy and charging rule function entity PCRF allocates a first quality of service class identifier, QCI, to the first radio access bearer used by the first service, and the relay base station receives and records the first QCI corresponding to the first radio access bearer, then the relay base station may obtain the first QCI corresponding to the first data packet, including: after the first data packet is obtained, determining a first radio access bearer for carrying the first data packet, and further determining a first QCI corresponding to the first radio access bearer; the relay base station judges whether the first QCI is matched with a first preset QCI set or not, and under the condition that the first QCI is matched with the first preset QCI set, the relay base station adds the first data packet into a short TTI queue, wherein the first preset QCI set comprises at least one QCI, different QCIs correspond to different services, and each QCI in the first preset QCI set corresponds to a low-delay service.

In this implementation manner, the first relay base station and the host base station may pre-store a first preset QCI set, and when the first relay base station supports the short TTI, it may further determine whether the QCI corresponding to the first data packet matches the first preset QCI set, and only when the QCI matches the first preset QCI set, the first data packet may be added to the short TTI queue, and since the QCI may reflect that the service corresponding to the data packet is a requirement for the delay, the service that is insensitive to the delay may be treated differently, so as to ensure the smoothness of the data transmission process of the low-delay service as much as possible; the method is beneficial to improving the intelligence of data transmission between the first relay base station and the host base station, and also provides the utilization rate of time-frequency resources between the first relay base station and the host base station.

In one possible implementation manner of the first aspect, the method further includes: when a backhaul link (backhaul) is established between the relay base station and the host base station, the relay base station sends identification information and capability information of the relay base station to the host base station, so that the host base station can determine that the relay base station supports the short TTI according to the capability information of the relay base station, and then the host base station can record the support condition of the relay base station to the short TTI corresponding to the identification of each relay base station by taking the identification of each relay base station as an index, wherein the capability information is used for identifying that the relay base station supports the short TTI, and the backhaul link is a link established when the relay base station is initially accessed to the host base station. In the implementation mode, when the relay base station initially accesses the host base station and establishes the return link with the host base station, the capability information of the relay base station is sent to the host base station, so that when the host base station initially accesses the host base station, whether the relay base station supports the short TTI can be determined according to the capability information, and then the host base station can manage the relay base station in time according to the capability of the relay base station, thereby being beneficial to shortening the transmission delay between the relay base station and the host base station in time, being beneficial to providing a data transmission channel with low delay for a user as early as possible and enhancing the viscosity of the user.

In one possible implementation manner of the first aspect, the sending, by the relay base station, the first data packet to the donor base station within the first time duration includes: the host base station may determine, after determining that the relay base station supports the short TTI, that the relay base station and the host base station predetermine a first time-frequency resource set in a negotiation manner, where the first time-frequency resource set may include a plurality of resource blocks, and is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI, where positions of the time-frequency resource sets allocated to different relay base stations in a frequency domain may be the same or different; the relay base station may send the first data packet to the host base station within the first time duration through the first time-frequency resource after acquiring the first data packet from the short TTI queue, where the first time-frequency resource belongs to the first time-frequency resource set. In this implementation manner, the host base station and the first relay base station may reserve time-frequency resources for the first relay base station to perform data transmission in a short TTI, so that when the first relay base station performs data transmission in a short TTI, steps of the first relay base station transmitting a resource scheduling request to the host base station, the host base station dividing frequency of the time-frequency resources, and the like are omitted, thereby further saving a time delay for performing data transmission between the first relay base station and the host base station, and further improving a support degree for low-delay services.

In a possible implementation manner of the first aspect, the relay base station may further receive a second data packet sent by the host base station through a second time-frequency resource, where a receiving duration of the second data packet is the first duration, and specifically, the relay base station may monitor the second data packet sent by the host base station on the second time-frequency resource, and more specifically, the relay base station may monitor whether there is at least one data packet sent by the host base station on the second time-frequency resource, and may also perform a monitoring operation every third duration, where the execution duration of the monitoring operation is the first duration. In the implementation mode, a scheme for realizing how the relay base station utilizes the short TTI technology to transmit data in the uplink direction and a scheme for realizing how the relay base station utilizes the short TTI technology to receive data in the downlink direction are provided, so that the implementation scene of the scheme is expanded, and the comprehensiveness of the scheme is improved.

In one possible implementation of the first aspect, the first time length is 2 symbols or 3 symbols in length in the time domain. In this implementation manner, the specific duration of the first duration is provided, so that the performability of the scheme is improved, and the length of the first duration is shortened from less than 1 millisecond to 2 symbols or 3 symbols, so that the communication delay between the first relay base station and the host base station is further shortened, and the support degree for the low-delay service is improved.

In a second aspect, the present embodiment further provides another data transmission method, which may be used in a scenario where a host base station communicates with a relay base station, where the relay base station, the host base station, and a terminal device all perform data transmission through one radio access bearer, and the host base station may receive at least one data packet sent by a core network device through the at least one radio access bearer, where in an LTE wireless communication network, the radio access bearer may be specifically represented as an evolved radio access bearer ERAB; because the data packet may carry identification information of the receiving party, the host base station may determine a relay base station corresponding to a second data packet, where the second data packet is one of the at least one data packet; and the host base station can further determine whether the relay base station supports the short transmission time interval TTI, and when the relay base station supports the short TTI, the host base station transmits the second data packet to the relay base station within a first time period, where the length of the first time period is less than 1 millisecond.

In this implementation manner, a short TTI technology is applied to a communication process between a first relay base station and a host base station, after the host base station receives at least one data packet sent by a core network device, the relay base station corresponding to a second data packet may be determined, and when the relay base station supports a short TTI, the host base station sends two adjacent first data packets to be sent to the host base station within a first time period.

In a possible implementation manner of the second aspect, before the host base station sends the second data packet to the relay base station within the first time period, the method further includes: in a case that the host base station determines that the second relay base station supports the short TTI, the host base station obtains a second quality of service class identifier QCI corresponding to the second data packet, and specifically, since the host base station receives at least one data packet sent by the core network device through at least one radio access bearer, the host base station may obtain the second radio access bearer for carrying the second data packet, and further, may obtain the second QCI corresponding to the second radio access bearer according to a correspondence between the radio access bearer and the QCI stored in the host base station; the donor base station may determine whether the second QCI is matched with the first preset QCI set, and add the second data packet to the short TTI queue when the second QCI is matched with the first preset QCI set, where the first preset QCI set includes at least one QCI, different QCIs correspond to different services, and each QCI included in the first preset QCI set corresponds to a low-latency service; the sending, by the donor base station, the second data packet to the relay base station within the first time period may specifically include: and the host base station acquires a second data packet from the short TTI queue and sends the second data packet to the relay base station within the first time length.

In this implementation, the host base station may pre-store a first preset QCI set, and when the first relay base station supports the short TTI, the host base station may further determine whether the QCI corresponding to the second data packet matches the first preset QCI set, and only when the QCI matches the first preset QCI set, add the second data packet to the short TTI queue, and because the QCI may reflect that the service corresponding to the data packet is a requirement for the delay, the service that is insensitive to the delay may be treated differently, so as to ensure the smoothness of the data transmission process of the low-delay service as much as possible; the method is beneficial to improving the intelligence of data transmission between the second relay base station and the host base station, and also provides the utilization rate of time-frequency resources between the second relay base station and the host base station.

In one possible implementation manner of the second aspect, the method further includes: when the host base station and the relay base station establish a return link, the host base station receives the capability information of the relay base station sent by the relay base station; the donor base station determines that the relay base station supports the short TTI according to the capability information of the relay base station, and specifically, in one case, when the donor base station can obtain the capability information of at least one relay base station, whether the relay base station supports the short TTI is judged according to the capability information of each relay base station, and then the support information of each relay base station to the short TTI is stored, when the donor base station needs to determine whether the second relay base station supports the short TTI, whether the second relay base station supports the short TTI is judged according to the support information of the short TTI, which is stored in advance, of the at least one relay base station accessing the donor base station; in another case, the donor base station may obtain and store the capability information of the at least one relay base station, and when the donor base station needs to determine whether the second relay base station supports the short TTI, the donor base station may obtain the capability information of the second relay base station from the capability information of the at least one relay base station, and further determine whether the second relay base station supports the short TTI according to the capability information of the second relay base station.

In the implementation manner, when the relay base station initially accesses the host base station and establishes the return link with the host base station, the host base station can receive the capability information sent by the relay base station, so that when the host base station initially accesses the host base station, whether the relay base station supports the short TTI can be determined according to the capability information, and then the host base station can manage the relay base station in time according to the capability of the relay base station, thereby being beneficial to shortening the transmission delay between the relay base station and the host base station in time, being beneficial to providing a low-delay data transmission channel for a user as early as possible, and enhancing the viscosity of the user.

In one possible implementation manner of the second aspect, the sending, by the donor base station, the second data packet to the relay base station within the first time period includes: the host base station may determine, after determining that the relay base station supports the short TTI, that the relay base station and the host base station predetermine a first time-frequency resource set in a negotiation manner, where the first time-frequency resource set may include a plurality of resource blocks, and is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI, where positions of the time-frequency resource sets allocated to different relay base stations in a frequency domain may be the same or different; the host base station may send the second data packet to the relay base station within the first time duration through the second time-frequency resource after acquiring the second data packet from the short TTI queue, where the first time-frequency resource belongs to the first time-frequency resource set. In this implementation manner, time-frequency resources may be reserved between the host base station and the second relay base station for data transmission of the second relay base station in a short TTI, so that when the host base station performs data transmission operation in a short TTI, a step of informing the relay base station that the second data packet is to be transmitted through the second time-frequency resources by the host base station is omitted, thereby further saving a time delay for data transmission between the second relay base station and the host base station, and further improving a support degree for low-delay services.

In one possible implementation manner of the second aspect, the method further includes: the host base station receives a first data packet sent by the relay base station through a first time-frequency resource, wherein the receiving duration of the first data packet is a first duration, specifically, the host base station can monitor a second data packet sent by the relay base station on the first time-frequency resource, more specifically, the host base station can monitor whether at least one data packet sent by the relay base station exists on the first time-frequency resource, and can also execute a monitoring operation every fourth duration, and the execution duration of the monitoring operation is the first duration. In the implementation mode, a realization scheme of how the host base station utilizes the short TTI technology to transmit data in the downlink direction and a realization scheme of how the host base station utilizes the short TTI technology to receive data in the uplink direction are provided, so that the implementation scene of the scheme is expanded, and the comprehensiveness of the scheme is improved.

In one possible implementation of the second aspect, the first time length is 2 symbols or 3 symbols in length in the time domain.

In a third aspect, an embodiment of the present application further provides a relay base station, where the relay base station includes: the device comprises an acquisition unit and a sending unit, wherein the acquisition unit is used for acquiring at least one data packet from a short Transmission Time Interval (TTI) queue under the condition that the relay base station supports the TTI; a sending unit, configured to send a first data packet to the host base station within a first time duration, where the first data packet is one of at least one data packet, and the length of the first time duration is less than 1 millisecond. In the implementation mode, the short TTI technology is applied to the communication process between the relay base station and the host base station, when the relay base station supports the short TTI, the relay base station is provided with a short TTI queue, the acquisition unit can acquire at least two first data packets to be transmitted from the short TTI queue, and the transmission unit transmits two adjacent first data packets to be transmitted to the host base station within a first time period.

For the constituent modules of the relay base station provided in the third aspect of the present application, the steps performed by the relay base station in the various possible implementation manners of the first aspect may also be performed, and the various possible implementation manners of the third aspect and the beneficial effects brought by each implementation manner may all refer to descriptions in the various possible implementation manners of the first aspect, and are not described again here.

In a fourth aspect, an embodiment of the present application further provides a donor base station, where the donor base station includes a receiving unit, a determining unit, and a sending unit, and the receiving unit is configured to receive at least one data packet sent by a core network device; a determining unit, configured to determine a relay base station corresponding to a second data packet, where the second data packet is one of the at least one data packet; a sending unit, configured to send the second packet to the relay base station within a first duration when the relay base station supports a short transmission time interval TTI, where a length of the first duration is less than 1 millisecond. In this implementation manner, the short TTI technology is applied to the communication process between the first relay base station and the host base station, after the receiving unit receives at least one data packet sent by the core network device, the determining unit may determine the relay base station corresponding to the second data packet, and when the relay base station supports the short TTI, the sending unit sends two adjacent first data packets to be sent to the host base station within the first time period.

For the constituent modules of the donor base station provided in the fourth aspect of the present application, the steps performed by the donor base station in the various possible implementation manners of the second aspect may also be performed, and the various possible implementation manners of the fourth aspect and the beneficial effects brought by each implementation manner may refer to descriptions in the various possible implementation manners of the second aspect, and are not described in detail herein.

In a fifth aspect, an embodiment of the present application further provides a relay base station, which may include a memory, a processor, and a bus system, where the memory is used to store a program, and the processor is used to execute the program in the memory, and includes the following steps: under the condition that the relay base station supports a short Transmission Time Interval (TTI), acquiring at least one data packet from a short TTI queue; sending a first data packet to the host base station within a first time period, wherein the first data packet is one data packet of at least one data packet, and the length of the first time period is less than 1 millisecond; the bus system is used for connecting the memory and the processor so as to enable the memory and the processor to communicate.

In a fifth aspect of the present application, the processor may be further configured to execute the steps executed by the relay base station in each possible implementation manner of the first aspect, which may specifically refer to the first aspect, and details are not described here.

In a sixth aspect, an embodiment of the present application further provides a host base station, which may include a memory, a processor, and a bus system, where the memory is used to store a program, and the processor is used to execute the program in the memory, and includes the following steps: receiving at least one data packet sent by core network equipment; determining a relay base station corresponding to a second data packet, wherein the second data packet is one of at least one data packet; under the condition that the relay base station supports a short transmission time interval TTI, a second data packet is sent to the relay base station within a first time length, and the length of the first time length is less than 1 millisecond; the bus system is used for connecting the memory and the processor so as to enable the memory and the processor to communicate.

In the sixth aspect of the present application, the processor may be further configured to execute the steps executed by the host base station in each possible implementation manner of the second aspect, which may specifically refer to the first aspect, and details are not described here.

In a seventh aspect, this application provides a computer-readable storage medium, in which a computer program is stored, and when the computer program runs on a computer, the computer is caused to execute the method of the first aspect or the second aspect.

In an eighth aspect, embodiments of the present application provide a computer program, which when run on a computer, causes the computer to perform the method of the first or second aspect.

In a ninth aspect, the present application provides a chip system, which includes a processor for enabling a relay base station or a donor base station to implement the functions referred to in the above aspects, for example, to transmit or process data and/or information referred to in the above methods. In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data for the relay base station or the donor base station. The chip system may be formed by a chip, or may include a chip and other discrete devices.

Drawings

Fig. 1 is a diagram of a network architecture of a data transmission system according to an embodiment of the present application;

fig. 2 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

fig. 3 is a schematic diagram of a relationship between time-frequency resources included in a first time-frequency resource set and a second time-frequency resource set according to an embodiment of the present application;

fig. 4 is another schematic flow chart of a data transmission method according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a relay base station according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a donor base station according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application are described below with reference to the accompanying drawings.

The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and are merely descriptive of the various embodiments of the application and how objects of the same nature can be distinguished. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that the data transmission method provided by the present application may be applied to relay scenarios under various communication systems, for example, when a base station provides a wireless communication signal for an urban area, a host base station may be used to provide a wireless communication signal for a crowd-dense area in the urban area, and a crowd-sparse area in the urban area inevitably has a wireless communication signal coverage blind area, and in order to improve the coverage rate of the wireless communication signal, the relay base station may be used to amplify or regenerate the wireless communication signal sent by the host base station and then forward the wireless communication signal, so that on the premise of saving the cost as much as possible, the coverage rate of the wireless communication signal is improved, and the communication quality of the wireless communication signal is ensured; as another example, for example, when a base station provides wireless communication signals for a town or a scenic spot, a host base station may be used to provide wireless communication signals for a densely populated area in the town, and a relay base station may be used to provide wireless communication signals for a sparsely populated village or deep scenic spot; as another example, when the base station provides a wireless communication signal for a mobile highway, for example, the host base station and the relay base station may be arranged along the mobile highway in a crossed manner, so that the wireless communication signal is provided by the host base station on a part of lines, the wireless communication signal is provided by the relay base station on a part of lines, and so on, which is not taken as an example for other application scenarios.

Among them, the present application can be applied to a host base station and a relay base station in various communication systems, including Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA) System, Wideband Code Division Multiple Access (WCDMA) System, General Packet Radio Service (GPRS) System, Long Term Evolution (Long Term Evolution, LTE) System, frequency Division duplex Long Term Evolution (LTE-FDD) System, time Division duplex Long Term Evolution (LTE-TDD) System, Universal Mobile Telecommunications System (UMTS), other radio Access System (OFDM) System, radio Access System (CDMA) System, and radio Access System (OFDM) System in the fifth generation communication (radio Access technology, LTE-FDD) System, 5G) a communication system, and any applicable future communication system.

Specifically, referring to fig. 1, fig. 1 is a network architecture diagram of a data transmission system provided in an embodiment of the present application, where the data transmission system includes a host base station 100, a relay base station 200, a first terminal device 300, and a second terminal device 400, and the host base station 100 adds a support for related functions of a relay technology on the basis of a common base station, and is configured to support access of the second terminal device 400, perform data communication with the second terminal device 400, and provide a wireless communication signal for the second terminal device 400; and also for supporting access of the relay base station 200 to provide a backhaul link for the relay base station 200. The relay base station 200 may be logically divided into a Remote Relay Node (RRN) and a backhaul base station (relay eNodeB, ReNB), where the RRN is used to support a part of functions of the terminal device and related functions of the relay technology, and the RRN is used to support the access of the first terminal device 300 to provide a wireless communication signal for the first terminal device 300; the ReNB is configured to support functions of a common base station and related functions of a relay technology, and the ReNB is configured to establish a bearer with the donor base station 100 to implement data communication between the relay base station 200 and the donor base station 100.

It should be understood that, although one donor base station 100, one relay base station 200, one first terminal device 300, and one second terminal device 400 are shown in fig. 1, one donor base station 100 may correspond to a plurality of relay base stations 200, one donor base station 100 may correspond to a first terminal device 300, and one relay base station 200 may correspond to a plurality of second terminal devices 400, and the number of the specific donor base stations 100, the relay base stations 200, the first terminal devices 300, and the second terminal devices 400 may be determined according to an actual application scenario, which is not limited herein.

In combination with the above description, the embodiment of the present application provides a data transmission method, which is applied to a scenario of communication between a host base station and a relay base station, where two scenarios, namely a downlink scenario and an uplink scenario, exist between the host base station and the relay base station, and data processing flows in the two scenarios are different, and the two scenarios, namely the downlink scenario and the uplink scenario, are exemplified below.

One, relay base station and host base station communicate in uplink direction

Referring to fig. 2, fig. 2 is an interaction schematic diagram of a donor base station and a relay base station according to an embodiment of the present disclosure, where an embodiment of a data transmission method according to the present disclosure may include:

201. when the at least one relay base station establishes a backhaul link with the donor base station, the at least one relay base station sends capability information of the relay base station to the donor base station.

In this embodiment of the present application, when initially accessing the donor base station, each relay base station may perform a communication negotiation with the donor base station to establish a backhaul link (backhaul) in a wireless communication manner with the donor base station, and because there are relay base stations that support a short Transmission Time Interval (TTI) and relay base stations that do not support a short TTI in the relay base station accessed to the donor base station, the donor base station may receive identification information and capability information of the relay base station in a process of establishing the backhaul link with the donor base station, where the capability information of the relay base station is used to identify that the relay base station supports the short TTI.

Specifically, the identification information of the relay base station may be an internet protocol address (IP), a media access control address (MAC) of the relay base station, or identification information configured by the host base station for each accessed relay base station, and the like, which is not limited herein. The relay base station and the donor base station may respectively identify whether the relay base station supports the short TTI by using two different states of the same field, for example, the relay base station and the donor base station both borrow a capability (capacity) field to transfer whether the relay base station supports the short TTI, and when information in the field is "on", the relay base station supports the short TTI; when the information in the aforementioned field is "off", it represents that the relay base station does not support the short TTI, and it should be understood that the foregoing example is only for convenience of understanding the present solution, and is not used to limit the present solution.

202. And the host base station determines whether the first relay base station supports the short transmission time interval TTI or not according to the capability information of the first relay base station.

In this embodiment, after receiving the capability information of the at least one relay base station, the donor base station may determine whether the relay base station supports the short TTI according to the capability of the first relay base station, where the first relay base station is any relay base station in the at least one relay base station connected to the donor base station. Further, since one donor base station can communicate with one or more relay base stations, under the condition that the donor base station communicates with the plurality of relay base stations, the donor base station can also record whether the plurality of relay base stations support the short TTI, specifically, the donor base station can use the identifier of each relay base station as an index, and the identifier of each relay base station corresponds to the support condition of the relay base station to the short TTI; more specifically, the host base station may store the information by an index, an array, a table, or other means, and here, the host base station stores the information in the form of a table, which is described in connection with table 1 below.

TABLE 1

Relay base station identification	Whether short TTI is supported or not
		0000001	Support for
0000002	Do not support
		0000003	Support for

Referring to table 1, in table 1, a host base station is described as an example of communication between the host base station and three relay base stations, where an identifier of a first relay base station is 0000001, and the first base station supports a short TTI; the identifier of the second relay base station is 0000002, and the second relay base station does not support short TTI; the third relay base station is identified as 0000003 and supports short TTIs, it should be understood that the example in table 1 is only used to facilitate understanding of the present solution and is not used to limit the present solution.

In the embodiment of the application, when the relay base station is initially accessed to the host base station and establishes the return link with the host base station, the capability information of the relay base station is sent to the host base station, so that when the host base station is initially accessed to the host base station, whether the relay base station supports the short TTI can be determined according to the capability information, and then the host base station can manage the relay base station in time according to the capability of the relay base station, thereby being beneficial to shortening the transmission delay between the relay base station and the host base station in time, being beneficial to providing a data transmission channel with low delay for a user as early as possible, and enhancing the viscosity of the user.

203. The first relay base station receives at least one data packet sent by the terminal equipment.

In some embodiments of the present application, since data transmission is performed on a service through one radio access bearer in all of the relay base station, the host base station, and the terminal device, the first relay base station may receive at least one data packet sent by the terminal device through at least one radio access bearer, where in a Long Term Evolution (LTE) wireless communication network, the radio access bearer may be represented as an Evolved Radio Access Bearer (ERAB), which may be referred to as an "ERAB bearer" hereinafter; in other types of communication networks, the radio access bearer may take other forms, and in the embodiment of the present application, only the radio access bearer is taken as an ERAB bearer for explanation.

Specifically, under the condition that the at least one data packet includes at least two data packets, if the at least two data packets correspond to different services, the terminal device needs to send the at least two data packets through at least two different ERAB bearers, where the different ERAB bearers respectively correspond to different radio access bearer identifiers, that is, there is a one-to-one correspondence between the ERAB bearer identifiers and the services.

204. And under the condition that the first relay base station supports the short TTI, the first relay base station acquires a first service Quality Class Identifier (QCI) corresponding to the first data packet.

In some embodiments of the present application, in a case that the first relay base station supports a short TTI, the first relay base station may obtain a first quality of service (QCI) corresponding to a first packet, where the first packet is a concept of a generic reference and refers to any one of at least one packet sent by a terminal device and received by the first relay base station. Specifically, when the first relay base station receives at least one data packet through one ERAB bearer, the first relay base station may obtain a first QCI corresponding to any one of the at least one data packet; when the first relay base station receives at least two data packets through at least two ERAB bearers, the first relay base station may respectively obtain a first data packet corresponding to each ERAB bearer, and further obtain a first QCI corresponding to each first data packet.

More specifically, when a first service on the terminal device needs to transmit service data, the terminal device may request to the first relay base station to establish a first ERAB bearer, and in a process of establishing the first ERAB bearer, the terminal device may report service parameters associated with the first service, such as a requirement of the first service for a time delay, a server to which the first service needs to access, a data amount that the first service needs to send, and the like, and then a Policy and Charging Rules Function (PCRF) may allocate a first QCI to the first ERAB bearer used by the first service and transmit the first QCI to the first relay base station step by step, so that in a process of establishing the first ERAB bearer of the first service, the first relay base station may store the first QCI corresponding to the first ERAB bearer, and when the first relay base station receives the first data packet, the first ERAB bearer used for transmitting the first data packet may be determined, and further, the first QCI corresponding to the first data packet may be determined according to a correspondence between the first ERAB bearer and the first QCI stored in the first relay base station.

205. The first relay base station judges whether the first QCI is matched with the first preset QCI set, and if so, the step 206 is performed; if not, go to step 210.

In some embodiments of the present application, the first relay base station may pre-store a first preset QCI set, so that after the first relay base station acquires the first QCI, the first relay base station may determine whether the first QCI exists in the first preset QCI set, and if the first QCI exists in the first preset QCI set, the first relay base station is considered that the first QCI matches with the first preset QCI set; and if the first preset QCI set does not have the first QCI, the first QCI is considered to be not matched with the first preset QCI set. As an example, the value of the QCI included in the first preset QCI set may include 1, 2, 3, or other values, and the like, which are not specifically limited herein, and further, the first preset QCI set may further include information, such as a service type corresponding to each QCI, a service priority corresponding to each QCI, a requirement of the service corresponding to each QCI for delay, and the like, which are not specifically limited herein.

Specifically, the first preset QCI set stored in the first relay base station may be sent by a PCRF in a core network device, and further, the PCRF may add a new QCI in the first preset QCI set or delete an old QCI according to an actual situation, and send the modified first preset QCI set to the first relay base station, so as to update the first preset QCI set stored in the first relay base station. In the embodiment of the application, the QCI included in the first preset QCI set may be changed according to the development of the communication technology, and when a new low-delay service occurs, the first preset QCI set may be modified in time, so as to shorten the communication delay of the low-delay service, ensure the communication quality of the low-delay service, and ensure the backward compatibility of the scheme.

After receiving the first preset QCI set, the first relay base station may store the first preset QCI set in the form of a table, an array, an index, a link, and the like, and the table storage is taken as an example for the first relay base station and is described with reference to table 2 below.

TABLE 2

Value of QCI	Type of service
		1	Traditional voice communication
2	Traditional video (also real-time streaming media)
		3	Real-time game
65	User-defined important tasks

Referring to table 2, in table 2, it is described that the first preset QCI set includes four QCIs, and the first preset QCI set includes values of the QCIs and service types corresponding to the QCIs, where the value of the QCI in the first row is 1, and the service type corresponding to the QCIs is a conventional voice call; the value of the QCI in the second row is 2, and the service type corresponding to the QCI is a traditional video (also called real-time streaming media); the value of the QCI in the third row is 3, and the service type corresponding to the QCI is real-time game; the value of the QCI in the fourth row is 65, and the service type corresponding to the QCI is an important user-defined task, and it should be understood that the examples in table 2 are only for convenience of understanding the scheme, and are not used for limiting the scheme.

More specifically, when the first QCI acquired by the first relay base station includes at least two QCIs, the first relay base station may determine, one by one, whether each QCI matches with the first preset QCI set.

206. The first relay base station adds the first data packet to the first short TTI queue.

In some embodiments of the present application, each data packet corresponds to one ERAB bearer, and each ERAB bearer may correspond to multiple data packets, that is, the corresponding relationship between a data packet and an ERAB bearer is a many-to-one relationship; each ERAB bearer corresponds to one TTI queue, and each TTI queue corresponds to one ERAB bearer, that is, the correspondence between the ERAB bearers and the TTI queues is a one-to-one relationship. Under the condition that the first relay base station determines that the first QCI is matched with the first QCI set, a first short TTI queue corresponding to the first ERAB bearer may be established on the first relay base station, and then the first short TTI queue corresponding to the first data packet may be determined according to a correspondence between the first ERAB bearer and the first short TTI queue. Specifically, the TTI queues in the embodiment of the present application all arrange a plurality of data packets from the head of the queue to the tail of the queue, the TTI queues may be specifically represented in the form of linked lists, and the first relay base station adds the first input packet to the first short TTI queue in the manner of adding the second data packet to the linked list corresponding to the first short TTI queue.

Specifically, if at least one data packet received by the first relay base station corresponds to the same first ERAB bearer, the first relay base station adds each first data packet of the at least one data packet to the same first short TTI queue one by one; if a plurality of data packets in at least one data packet received by the first relay base station all correspond to at least two different first ERAB bearers, the first relay base station needs to determine a first short TTI queue corresponding to each first data packet, and add each first data packet to the corresponding first short TTI queue.

207. The first relay base station obtains at least one data packet from the first short TTI queue.

In some embodiments of the present application, when acquiring at least one data packet, the first relay base station also acquires at least one data packet one by one from the head of the first short TTI queue to the tail of the first short TTI queue, and may further send the first data packet one by one from the head of the first short TTI queue to the tail of the first short TTI queue.

208. The first relay base station sends a first data packet to the host base station within a first time span through the first time frequency resource.

In some embodiments of the present application, after acquiring the first data packet, the first relay base station may send the first data packet to the host base station through the first time-frequency resource within a first time period, that is, a time period for the first relay base station to perform a data packet sending operation is less than or equal to the first time period. The first time-frequency resource may include a plurality of Resource Blocks (RBs), and the first time-frequency resource belongs to a first time-frequency resource set, where the first time-frequency resource set is a time-frequency resource reserved for the first relay base station to perform data transmission in a short TTI; the length of the first duration is less than 1 millisecond, optionally, the length of the first duration in the time domain is 2 symbols or 3 symbols, in the embodiment of the application, the specific duration of the first duration is provided, the performability of the scheme is improved, the length of the first duration is shortened from less than 1 millisecond to 2 symbols or 3 symbols, the communication delay between the first relay base station and the host base station is further shortened, and the support degree of the low-delay service is improved.

Specifically, after determining that the first relay base station supports the short TTI, the donor base station and the first relay base station may determine a first time-frequency resource set in advance in a negotiation manner, where the first time-frequency resource set may include multiple RBs; optionally, the positions of the first time-frequency resource sets allocated by each relay base station on the frequency domain may be the same or different; further, since the host base station may pre-allocate a fixed third time-frequency resource set to a first relay base station for implementing communication between the host base station and the first relay base station, the first time-frequency resource set belongs to the third time-frequency resource set, for example, the host base station allocates the third time-frequency resource set occupying 880MHz to 900MHz frequency bands in the frequency domain to the first relay base station, and the first time-frequency resource set may occupy 880MHz to 882MHz in the frequency domain, for example, it should be understood that this example is only for convenience of understanding of the present solution, and is not limited to this solution.

More specifically, when the first relay base station transmits the first data packet, the first relay base station may directly perform the transmission operation of the first data packet through the first time-frequency resource after acquiring the first data packet; the sending rule of the first data packet may also be negotiated in advance for the first relay base station and the host base station, for example, the first data packet is sent every third time duration, where the execution time duration of the sending operation of the first data packet is the first time duration, after the first relay base station acquires the first data packet, the first relay base station needs to wait for a sending period of the first data packet first and then execute the sending operation of the first data packet, and the third time duration may be 5 milliseconds, 3 milliseconds, 1 millisecond, or another length, and the like.

209. The host base station receives a first data packet sent by the first relay base station through the first time-frequency resource, wherein the receiving duration of the first data packet is a first duration.

Correspondingly, under the condition that the first relay base station supports the short TTI, the host base station may receive at least one data packet sent by the first relay base station through the first time-frequency resource, where a receiving duration of the host base station for the first data packet is the first duration. Specifically, the donor base station may monitor whether there is a first data packet sent by the first relay base station on the first set of time and frequency resources. More specifically, the donor base station may monitor whether a first data packet is sent on the first set of time and frequency resources all the time; the sending period may also be negotiated with the first relay base station in advance, and the monitoring operation of the first duration may be performed every third duration, and the like, which is not limited herein.

In the embodiment of the application, the first relay base station and the host base station may pre-store a first preset QCI set, and when the first relay base station supports a short TTI, it may be further determined whether a QCI corresponding to the first data packet matches the first preset QCI set, and only when the QCI matches the first preset QCI set, the first data packet may be added to the short TTI queue, and since the QCI may reflect that a service corresponding to the data packet is a requirement on a delay, it may be possible to distinguish between a low-delay service and a service insensitive to the delay, so as to ensure a smooth data transmission process of the low-delay service as much as possible; the method is beneficial to improving the intelligence of data transmission between the first relay base station and the host base station, and also provides the utilization rate of time-frequency resources between the first relay base station and the host base station.

In the embodiment of the application, the host base station and the first relay base station can reserve time-frequency resources for the first relay base station to perform data transmission in a short TTI, so that when the first relay base station performs data transmission in a short TTI, steps of the first relay base station transmitting a resource scheduling request to the host base station, the host base station dividing frequency of the time-frequency resources and the like are saved, time delay of data transmission between the first relay base station and the host base station is further saved, and support of low-delay services is further improved.

210. And the first relay base station adds the first data packet into the first common TTI queue.

In this embodiment, step 210 is similar to step 206, except that the execution condition of step 206 is that the first relay base station supports the short TTI technology, and the execution condition of step 210 is that the first relay base station does not support the short TTI technology, and the first relay base station in step 206 establishes a short TTI queue and the first relay base station in step 210 establishes a normal TTI queue; the common TTI queue and the short TTI queue may be both expressed in the form of a linked list, but the first relay base station may allocate different queue identifiers to the short TTI queue and the common TTI queue, respectively, to distinguish the two types of queues.

211. The first relay base station obtains at least one data packet from the first normal TTI queue.

In the embodiment of the present application, step 211 is similar to step 207, except that in step 207, the data packet is obtained from the short TTI queue, and in step 211, the data packet is obtained from the normal TTI queue.

212. And the first relay base station sends the first data packet to the host base station in the second duration through the third time-frequency resource.

In some embodiments of the present application, the first relay base station sends the first data packet to the host base station within the second duration through the third time-frequency resource. The third time frequency resource may include a plurality of RBs, and the third time frequency resource may belong to the second time frequency resource set; the length of the second time period in the time domain is greater than the first time period, and the length of the second time period can be expressed as 1 millisecond, 2 milliseconds or other values.

In one case, to enter step 210 through step 202, the time-frequency resources included in the second time-frequency resource set and the time-frequency resources included in the third time-frequency resource set may be consistent, that is, all the time-frequency resources allocated by the host base station to the first relay base station are used for data transmission in the normal TTI.

In another case, for step 210 entered through step 205, please refer to fig. 3, where fig. 3 illustrates a relationship between a first time-frequency resource set and a second time-frequency resource set in the data transmission method provided in this embodiment of the present application, fig. 3 includes (a) and (b) two sub-diagrams, please refer to (a) sub-diagram of fig. 3 first, and the second time-frequency resource set may be two time-frequency resource sets that do not intersect with the first time-frequency resource set at all; please continue to refer to the sub-diagram of fig. 3 (b), a part of the time-frequency resources in the second time-frequency resource set intersect with a part of the time-frequency resources in the first time-frequency resource set, that is, some of the time-frequency resources in the first time-frequency resource set are only used for data transmission in a short TTI, some of the time-frequency resources may be used for data transmission in a short TTI, or may be used for data transmission in a normal TTI, and all of the time-frequency resources in the second time-frequency resource set may be used for data transmission in a short TTI, or may be used for data transmission in a normal TTI. Optionally, the time-frequency resources in the intersection of the first time-frequency resource set and the second time-frequency resource set are preferentially used for data transmission in a short TTI.

Specifically, before the first relay base station sends the first data packet through the third time-frequency resource, the first relay base station needs to negotiate with the host base station, so that the host base station determines the third time-frequency resource from the second time-frequency resource set and allocates the third time-frequency resource to the first relay base station, and then the first relay base station sends the first data packet to the host base station through the third time-frequency resource.

213. And the host base station receives a first data packet sent by the first relay base station through a third time-frequency resource, wherein the receiving time length of the first data packet is a second time length.

Correspondingly, after allocating the third time-frequency resource to the first relay base station, the host base station may monitor at least one data packet sent by the first relay base station on the third time-frequency resource, where a receiving duration of each first data packet in the at least one data packet by the host base station is the second duration.

It should be understood that step 205 is an optional step, and if step 205 is not executed, step 206 may be directly executed after step 204 is executed, that is, the first relay base station may add all the first data packets in at least one data packet to the short TTI queue, and if step 205 is not executed, steps 210 to 213 need not be executed.

The execution sequence of step 202 is not limited in the embodiment of the present application, and step 202 may be executed before any one of steps 203 to 207 and steps 210 to 211, or step 202 may be executed after any one of steps 203 to 207 and steps 210 to 211, as long as it is executed before the first relay base station determines the time-frequency resource for transmitting the first data packet.

It should be noted that, in the embodiment of the present application, the relationship between the execution times of steps 201 to 202 and steps 203 to 213 is not limited, and the execution times of steps 201 to 202 may be different from the execution times of steps 203 to 213.

In the embodiment of the application, a short TTI technology is applied to a communication process between a first relay base station and a host base station, and when the first relay base station supports a short TTI, a short TTI queue is arranged on the first relay base station, and the first relay base station can obtain at least two first data packets to be transmitted from the short TTI queue and transmit two adjacent first data packets to be transmitted to the host base station within a first time period.

Second, the relay base station and the host base station communicate in the downlink direction

In order to introduce the work flow of the data transmission method in the downlink direction according to the embodiment of the present application, on the basis of multiple embodiments corresponding to fig. 2, referring to fig. 4, a work flow of the data transmission method in the uplink direction according to the embodiment of the present application is described next with reference to the accompanying drawings, where fig. 4 is an interaction schematic diagram of a host base station and a relay base station according to the embodiment of the present application, and another embodiment of the data transmission method according to the embodiment of the present application may include:

401. when at least one relay base station and the host base station establish a backhaul link, the host base station receives the capability information of the relay base station sent by the at least one relay base station.

In this embodiment of the application, step 401 is similar to step 201 in the embodiment shown in fig. 2, and a specific implementation manner of step 401 may refer to the description in step 201, which is not described herein again.

402. And the host base station receives at least one data packet sent by the core network equipment.

In some embodiments of the present application, since data transmission is performed on one service through one radio access bearer in all of the relay base station, the donor base station, and the terminal device, the donor base station may receive at least one data packet sent by the core network device through at least one ERAB bearer. Specifically, the donor base station may receive at least one data packet through one ERAB bearer; it is also possible to receive at least two data packets over at least two ERAB bearers.

403. And the host base station determines a second relay base station corresponding to a second data packet, wherein the second data packet is one of at least one data packet.

In some embodiments of the present application, since each data packet may carry identification information of a receiver of the data packet, after receiving at least one data packet, the host base station may further determine identification information of second relay base stations corresponding to one second data packet one by one, that is, determine a second relay base station corresponding to each second data packet.

404. The host base station judges whether the second relay base station supports the short transmission time interval TTI, if so, the step 405 is executed; if the short TTI is not supported, the process proceeds to step 411.

In some embodiments of the present application, after determining the second relay base station corresponding to the second data packet, the donor base station may determine whether the second relay base station supports the short TTI.

In one case, when the capability information of at least one relay base station is obtained in step 401, the donor base station may determine whether the relay base station supports the short TTI according to the capability information of each relay base station, and further store the support information of each relay base station for the short TTI through an index, an array, a table, or other manners, then step 404 may specifically include: and the host base station judges whether the second relay base station supports the short TTI according to the pre-stored support information of the short TTI by the at least one relay base station, wherein the second relay base station is any one of the at least one relay base station accessed to the host base station.

In another case, the donor base station may store the capability information of each relay base station when the capability information of at least one relay base station is obtained in step 401, and step 404 may specifically include: and the host base station acquires the capability information of the second relay base station from the capability information of at least one relay base station, and then judges whether the second relay base station supports the short TTI or not according to the capability information of the second relay base station.

405. And under the condition that the second relay base station supports the short TTI, the host base station acquires a second service Quality Class Identifier (QCI) corresponding to the second data packet.

In some embodiments of the present application, when the donor base station determines that the second relay base station supports the short TTI, the donor base station may obtain a second QCI corresponding to a second data packet, where the second data packet is a concept of a generic reference, and refers to any one of at least one data packet sent by the core network device and received by the second relay base station.

Specifically, step 405 is similar to step 204 in the corresponding embodiment of fig. 2, because the donor base station receives at least one data packet sent by the core network device through at least one ERAB bearer, the donor base station may learn a second ERAB bearer for carrying the second data packet, and further may obtain a second QCI corresponding to the second ERAB bearer according to a correspondence between the ERAB bearer and the QCI stored in the donor base station. The specific implementation of step 405 may refer to the description of step 204 in fig. 2, and is not described herein again.

406. The host base station judges whether the second QCI is matched with the first preset QCI set, and if so, the step 407 is carried out; if not, go to step 411.

In this embodiment, step 406 is similar to step 205 in the corresponding embodiment of fig. 2, and the first preset QCI set may also be stored in the host base station, and after the host base station acquires the second QCI, it may be determined whether the second QCI is matched with the first preset QCI set, where the first preset QCI sets stored in the host base station and the relay base station may be the same and are both generated by the PCRF. The specific implementation of step 406 may refer to the description of step 205 in fig. 2, and is not described herein again.

407. And the host base station adds the second data packet into the second short TTI queue.

408. And the host base station acquires the second data packet from the second short TTI queue.

409. And the host base station sends a second data packet to the relay base station within the first time length through the second time frequency resource.

In the embodiment of the present application, steps 407 to 409 are similar to steps 206 to 208 in the corresponding embodiment of fig. 2, except that the main execution subject of steps 206 to 208 is the relay base station, and the main execution subject of steps 407 to 409 is the host base station. The second short TTI queue differs from the first short TTI queue in that the first short TTI queue is a short TTI queue existing on the relay base station, and the second short TTI queue is a short TTI queue existing on the donor base station; the second time-frequency resource and the first time-frequency resource both belong to a first time-frequency resource set, the first time-frequency resource set is a time-frequency resource reserved by the host base station for data transmission in a short TTI manner, the second time-frequency resource and the first time-frequency resource can be different time-frequency resources or the same time-frequency resource, and the difference is that the second time-frequency resource is used for bearing a second data packet sent by the host base station to the relay base station, and the first time-frequency resource is used for bearing a first data packet sent by the relay base station to the host base station. The specific implementation manner of steps 407 to 409 may refer to the description of steps 206 to 208, which is not described herein again.

410. And the relay base station receives a second data packet sent by the host base station through a second time-frequency resource, wherein the receiving time length of the second data packet is the first time length.

In the embodiment of the present application, step 410 is similar to step 209 in the corresponding embodiment of fig. 2, except that the main execution body of step 209 is the donor base station, and the main execution body of step 410 is the relay base station.

In the embodiment of the application, the host base station may pre-store a first preset QCI set, and when the first relay base station supports the short TTI, the host base station may further determine whether the QCI corresponding to the second data packet matches the first preset QCI set, and only when the QCI matches the first preset QCI set, the second data packet is added to the short TTI queue, and since the QCI may reflect that the service corresponding to the data packet is a requirement on the delay, the service that is low in delay and the service that is not sensitive to delay may be treated differently, so as to ensure the smoothness of the data transmission process of the low-delay service as much as possible; the method is beneficial to improving the intelligence of data transmission between the second relay base station and the host base station, and also provides the utilization rate of time-frequency resources between the second relay base station and the host base station.

In the embodiment of the application, time-frequency resources can be reserved between the host base station and the second relay base station for data transmission of the second relay base station in a short TTI manner, so that when the host base station performs data transmission operation in a short TTI manner, a step of informing the relay base station that the second data packet is to be transmitted through the second time-frequency resources by the host base station is saved, thereby further saving time delay of data transmission between the second relay base station and the host base station, and further improving the support degree of low-delay service.

411. And the host base station adds the second data packet into the second common TTI queue.

412. And the host base station acquires the second data packet from the second common TTI queue.

413. And the host base station sends a second data packet to the relay base station in the second duration through the fourth time-frequency resource.

In the embodiment of the present application, steps 411 to 413 are similar to steps 210 to 212 in the corresponding embodiment of fig. 2, except that the main execution entity of steps 210 to 212 is the relay base station, and the main execution entity of steps 411 to 413 is the host base station. The second common TTI queue is different from the first common TTI queue in that the first common TTI queue is a common TTI queue existing on the relay base station, and the second common TTI queue is a common TTI queue existing on the host base station; the fourth time-frequency resource and the third time-frequency resource both belong to a third time-frequency resource set, the third time-frequency resource set is a time-frequency resource reserved by the host base station for data transmission in a normal TTI manner, the fourth time-frequency resource and the third time-frequency resource can be different time-frequency resources or the same time-frequency resource, and the difference is that the fourth time-frequency resource is used for bearing a second data packet sent by the host base station to the relay base station, and the third time-frequency resource is used for bearing a first data packet sent by the relay base station to the host base station. The specific implementation manner of steps 411 to 413 can refer to the description of steps 210 to 212, and is not described herein again.

414. And the relay base station receives a second data packet sent by the host base station through a fourth time-frequency resource, wherein the receiving duration of the second data packet is a second duration.

In the embodiment of the present application, step 414 is similar to step 213 in the corresponding embodiment of fig. 2, except that the main execution body of step 213 is the donor base station, and the main execution body of step 414 is the relay base station.

In the embodiment of the application, a short TTI technology is applied to a communication process between a first relay base station and a host base station, the host base station can determine a relay base station corresponding to a second data packet after receiving at least one data packet sent by core network equipment, and the host base station sends two adjacent first data packets to be sent to the host base station within a first time period under the condition that the relay base station supports the short TTI, because the length of the first time period is less than 1 millisecond, compared with a common TTI technology adopted between the first relay base station and the host base station, the communication delay between the first relay base station and the host base station is shortened, the data transmission rate is favorably improved, and the support degree for low-delay services is improved.

On the basis of the embodiments corresponding to fig. 2 to 4, in order to better implement the above-mentioned solution of the embodiments of the present application, the following also provides a related device for implementing the above-mentioned solution. Specifically referring to fig. 5, fig. 5 is a schematic structural diagram of a relay base station according to an embodiment of the present application, where a relay base station 500 includes an obtaining unit 501 and a sending unit 502. The acquiring unit 501 is configured to acquire at least one data packet from a short TTI queue under the condition that the relay base station supports a short TTI; a sending unit 502, configured to send a first data packet to the host base station within a first time duration, where the first data packet is one of the at least one data packet, and the length of the first time duration is less than 1 millisecond.

In the embodiment of the application, a short TTI technology is applied to a communication process between a relay base station and a host base station, when the relay base station supports a short TTI, a short TTI queue is arranged on the relay base station, the obtaining unit 501 can obtain at least two first to-be-transmitted data packets from the short TTI queue, and the transmitting unit 502 transmits two adjacent first to-be-transmitted data packets to the host base station within a first time period.

In a possible design, the obtaining unit 501 is further configured to obtain a first quality of service class identifier QCI corresponding to the first data packet; the relay base station further includes: the adding unit 503 is configured to add the first data packet to the short TTI queue by the relay base station when the first QCI is matched with a first preset QCI set, where the first preset QCI set includes at least one QCI.

In the embodiment of the present application, the first relay base station and the host base station may pre-store a first preset QCI set, and when the first relay base station supports a short TTI, it may further determine whether a QCI corresponding to the first data packet matches the first preset QCI set, and only when the QCI matches the first preset QCI set, the adding unit 503 may add the first data packet to the short TTI queue, and because the QCI may reflect that a service corresponding to the data packet is a requirement on a delay, the service that is insensitive to the delay may be treated differently, so as to ensure the smoothness of a data transmission process of the low-delay service as much as possible; the method is beneficial to improving the intelligence of data transmission between the first relay base station and the host base station, and also provides the utilization rate of time-frequency resources between the first relay base station and the host base station.

In one possible design, the sending unit 502 is further configured to send, to the donor base station, capability information of the relay base station when the relay base station establishes a backhaul link with the donor base station, where the capability information is used to identify that the relay base station supports a short TTI, and the backhaul link is a link established when the relay base station initially accesses the donor base station.

In the embodiment of the present application, when the relay base station initially accesses the host base station and establishes a backhaul link with the host base station, the sending unit 502 sends the capability information of the relay base station to the host base station, so that when the host base station initially accesses the host base station, it can be determined whether the relay base station supports a short TTI according to the capability information, and then the host base station can manage the relay base station in time according to the capability of the relay base station, thereby being beneficial to shortening the transmission delay between the relay base station and the host base station in time, being beneficial to providing a low-delay data transmission channel for a user as early as possible, and enhancing the user viscosity.

In one possible design, the sending unit 502 is specifically configured to: and sending a first data packet to the host base station within a first time duration through the first time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI (transmission time interval) mode.

In this embodiment of the present application, the host base station and the first relay base station may reserve time-frequency resources for the first relay base station to perform data transmission in a short TTI, so that when the sending unit 502 performs data sending operation in a short TTI, steps of sending a resource scheduling request to the host base station by the first relay base station, dividing the frequency of the time-frequency resources by the host base station, and the like are omitted, thereby further saving a time delay for performing data transmission between the first relay base station and the host base station, and further improving a support degree for low-delay services.

In one possible design, the first duration may be 2 symbols or 3 symbols in length in the time domain.

In the embodiment of the application, the specific duration of the first duration is provided, the performability of the scheme is improved, the length of the first duration is shortened from less than 1 millisecond to 2 symbols or 3 symbols, the communication delay between the first relay base station and the host base station is further shortened, and the support degree of low-delay service is improved.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a donor base station provided in the embodiment of the present application, where the donor base station includes a receiving unit 601, a determining unit 602, and a sending unit 603. The receiving unit 601 is configured to receive at least one data packet sent by a core network device; a determining unit 602, configured to determine a relay base station corresponding to a second data packet, where the second data packet is one of at least one data packet; a sending unit 603, configured to send the second packet to the relay base station within a first time duration when the relay base station supports the short TTI, where a length of the first time duration is less than 1 ms.

In this embodiment of the present application, a short TTI technology is applied to a communication process between a first relay base station and a host base station, after a receiving unit 601 receives at least one data packet sent by a core network device, a determining unit 602 may determine a relay base station corresponding to a second data packet, and when the relay base station supports a short TTI, a sending unit 603 sends two adjacent first to-be-sent data packets to the host base station within a first time period, where because the length of the first time period is less than 1 millisecond, compared with a common TTI technology adopted between a first relay base station and a host base station, a communication delay between the first relay base station and the host base station is shortened, which is beneficial to improving a data transmission rate, and improving a support degree for a low-delay service.

In one possible design, the donor base station further includes: an acquisition unit 604 and an adding unit 605; an obtaining unit 604, configured to obtain a second quality of service class identifier QCI corresponding to the second packet; an adding unit 605, configured to add the second data packet to the short TTI queue when the second QCI is matched with a first preset QCI set, where the first preset QCI set includes at least one QCI; the sending unit 603 is specifically configured to: and acquiring a second data packet from the short TTI queue, and transmitting the second data packet to the relay base station within the first time length.

In this embodiment of the present application, the host base station may pre-store a first preset QCI set, and when the first relay base station supports the short TTI, it may further determine whether the QCI corresponding to the second data packet matches the first preset QCI set, and only when the QCI matches the first preset QCI set, the adding unit 605 may add the second data packet to the short TTI queue, and since the QCI may reflect that the service corresponding to the data packet is a requirement on the delay, it may be possible to implement differentiated treatment on the low-delay service and the service insensitive to the delay, so as to ensure the smoothness of the data transmission process of the low-delay service as much as possible; the method is beneficial to improving the intelligence of data transmission between the second relay base station and the host base station, and also provides the utilization rate of time-frequency resources between the second relay base station and the host base station.

In a possible design, the receiving unit 601 is further configured to receive capability information of the relay base station sent by the relay base station when the donor base station establishes a backhaul link with the relay base station; the determining unit 602 is further configured to determine that the relay base station supports the short TTI according to the capability information of the relay base station.

In the embodiment of the application, when the relay base station initially accesses the host base station and establishes a backhaul link with the host base station, the receiving unit 601 may receive capability information sent by the relay base station, so that when the host base station initially accesses the host base station, it may be determined whether the relay base station supports a short TTI according to the capability information, and then the host base station may manage the relay base station in time according to the capability of the relay base station, thereby being beneficial to shortening the transmission delay between the relay base station and the host base station in time, being beneficial to providing a low-delay data transmission channel for a user as early as possible, and enhancing the user viscosity.

In one possible design, the sending unit 603 is specifically configured to: and sending each second data packet to the relay base station within a first time span through the first time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI (transmission time interval) mode.

In this embodiment, time-frequency resources may be reserved between the host base station and the second relay base station for data transmission of the second relay base station in a short TTI, so that when the sending unit 603 performs data sending operation in a short TTI, the step of the host base station informing the relay base station that the second data packet is to be sent through the second time-frequency resources is omitted, thereby further saving a time delay for data transmission between the second relay base station and the host base station, and further improving the support for low-latency services.

In one possible design, the receiving unit 601 is further configured to receive each first data packet sent by the relay base station, where a receiving duration of each first data packet is a first duration.

In the embodiment of the application, a realization scheme of how the host base station utilizes the short TTI technology to transmit data in the downlink direction and a realization scheme of how the host base station utilizes the short TTI technology to receive data in the uplink direction are provided, so that the realization scene of the scheme is expanded, and the comprehensiveness of the scheme is improved.

Next, a communication device provided in an embodiment of the present application is introduced, where the communication device may be configured to implement the steps performed by the relay base station in the foregoing embodiment, and may also be configured to implement the steps performed by the host base station in the foregoing embodiment. When the communication device is configured to implement the steps performed by the relay base station in the foregoing embodiment, the relay base station in the embodiment shown in fig. 5 may be deployed on the communication device; when the communication device is configured to implement the steps executed by the donor base station in the foregoing embodiment, the donor base station in the embodiment shown in fig. 6 may be deployed on the communication device. Referring to fig. 7, fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure, where the communication device 700 includes: a receiver 701, a transmitter 702, a processor 703 and a memory 704 (wherein the number of the processors 703 in the relay base station 700 may be one or more, and one processor is taken as an example in fig. 7), wherein the processor 703 may include an application processor 7031 and a communication processor 7032. In some embodiments of the present application, the receiver 701, the transmitter 702, the processor 703, and the memory 704 may be connected by a bus or other means.

The memory 704 may include read-only memory and random access memory, and provides instructions and data to the processor 703. A portion of the memory 704 may also include non-volatile random access memory (NVRAM). The memory 704 stores processors and operating instructions, executable modules or data structures, or subsets thereof, or expanded sets thereof, wherein the operating instructions may include various operating instructions for performing various operations.

The processor 703 controls the operation of the relay base station. In a specific application, the various components of the relay base station are coupled together by a bus system, wherein the bus system may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For clarity of illustration, the various buses are referred to in the figures as a bus system.

The method disclosed in the embodiment of the present application may be applied to the processor 703 or implemented by the processor 703. The processor 703 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the method may be implemented by hardware integrated logic circuits in the processor 703 or by instructions in the form of software. The processor 703 may be a general-purpose processor, a Digital Signal Processing (DSP), a microprocessor or a microcontroller, and may further include an Application Specific Integrated Circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The processor 703 may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory 704, and a processor 703 reads information in the memory 704 and performs the steps of the above method in combination with hardware thereof.

The receiver 701 may be used to receive input numeric or character information and generate signal inputs related to relay base station related settings and function control. The transmitter 702 may be configured to output numeric or character information via the first interface; the transmitter 702 may also be configured to send instructions to the disk group via the first interface to modify data in the disk group; the transmitter 702 may also include a display device such as a display screen.

In one case, the processor 703 is configured to execute the data transmission method performed by the relay base station in the corresponding embodiment of fig. 5. Specifically, the application processor 7031 is configured to, in a case that the relay base station supports a short TTI, obtain at least one data packet from the short TTI queue; and sending a first data packet to the host base station within a first time length, wherein the first data packet is one data packet in at least one data packet, and the length of the first time length is less than 1 millisecond.

In one possible design, the application processor 7031 is further configured to obtain a first quality of service class identifier, QCI, corresponding to the first packet; and under the condition that the first QCI is matched with a first preset QCI set, adding the first data packet into the short TTI queue, wherein the first preset QCI set comprises at least one QCI.

In one possible design, the application processor 7031 is further configured to send, to the donor base station, capability information of the relay base station when the relay base station establishes a backhaul link (backhaul) with the donor base station, where the capability information is used to identify that the relay base station supports a short TTI, and the backhaul link is a link established when the relay base station initially accesses the donor base station.

In one possible design, the application processor 7031 is specifically configured to: and sending a first data packet to the host base station within a first time duration through the first time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI (transmission time interval) mode.

It should be noted that, the specific manner in which the application processor 7031 executes the above steps is based on the same concept as that of the method embodiments corresponding to fig. 2 to 3 in the present application, and the technical effect brought by the method embodiments is the same as that of the method embodiments corresponding to fig. 2 to 3 in the present application, and specific contents may refer to descriptions in the foregoing method embodiments in the present application, and are not described again here.

In another case, the processor 703 is configured to execute the data transmission method performed by the donor base station in the corresponding embodiment of fig. 6. Specifically, the application processor 7031 is configured to receive at least one data packet sent by the core network device; determining a relay base station corresponding to a second data packet, wherein the second data packet is one of at least one data packet; and under the condition that the relay base station supports the short transmission time interval TTI, transmitting a second data packet to the relay base station within a first time length, wherein the length of the first time length is less than 1 millisecond.

In one possible design, the application processor 7031 is further configured to obtain a second quality of service class identifier, QCI, corresponding to the second packet; under the condition that the second QCI is matched with a first preset QCI set, the host base station adds a second data packet into a short TTI queue, wherein the first preset QCI set comprises at least one QCI;

the application processor 7031 is specifically configured to: and acquiring a second data packet from the short TTI queue, and transmitting the second data packet to the relay base station within the first time length.

In a possible design, the application processor 7031 is further configured to receive, when the donor base station establishes a backhaul link with the relay base station, capability information of the relay base station sent by the relay base station;

and the host base station determines that the relay base station supports the short TTI according to the capability information of the relay base station.

In one possible design, the application processor 7031 is specifically configured to: and sending a second data packet to the relay base station within the first time duration through a second time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the relay base station to perform data transmission in a short TTI manner.

It should be noted that, the specific manner in which the application processor 7031 executes the above steps is based on the same concept as that of each method embodiment corresponding to fig. 4 in the present application, and the technical effects brought by the specific manner are the same as those of each method embodiment corresponding to fig. 4 in the present application, and specific contents may refer to descriptions in the foregoing method embodiments in the present application, and are not described herein again.

An embodiment of the present application further provides a computer program product, which includes a program for performing data processing, and when the program is run on a computer, the program causes the computer to perform the steps performed by the relay base station in the method described in the foregoing embodiment shown in fig. 2 or fig. 3, or causes the computer to perform the steps performed by the host base station in the method described in the foregoing embodiment shown in fig. 4.

An embodiment of the present application further provides a computer-readable storage medium, in which a program for performing data processing is stored, and when the program runs on a computer, the computer is caused to perform the steps performed by the relay base station in the method described in the foregoing embodiment shown in fig. 2 or fig. 3, or the computer is caused to perform the steps performed by the host base station in the method described in the foregoing embodiment shown in fig. 4.

The relay base station or the host base station provided in the embodiment of the present application may specifically be a chip, where the chip includes: a processing unit, which may be for example a processor, and a communication unit, which may be for example an input/output interface, a pin or a circuit, etc. The processing unit can execute the computer execution instructions stored in the storage unit to make the chip in the terminal execute the data transmission method of any one of the first aspect. Optionally, the storage unit is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the terminal, such as a read-only memory (ROM) or another type of static storage device that can store static information and instructions, a Random Access Memory (RAM), and the like.

Wherein any of the aforementioned processors may be a general purpose central processing unit, a microprocessor, an ASIC, or one or more integrated circuits configured to control the execution of the programs of the method of the first aspect.

It should be noted that the above-described embodiments of the apparatus are merely schematic, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiments of the apparatus provided in the present application, the connection relationship between the modules indicates that there is a communication connection therebetween, and may be implemented as one or more communication buses or signal lines.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus necessary general-purpose hardware, and certainly can also be implemented by special-purpose hardware including special-purpose integrated circuits, special-purpose CPUs, special-purpose memories, special-purpose components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions may be various, such as analog circuits, digital circuits, or dedicated circuits. However, for the present application, the implementation of a software program is more preferable. Based on such understanding, the technical solutions of the present application may be substantially embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods described in the embodiments of the present application.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Claims

1. A method of data transmission, the method comprising:

under the condition that a relay base station supports a short Transmission Time Interval (TTI), the relay base station acquires at least one data packet from a short TTI queue;

the relay base station sends a first data packet to the host base station within a first time length, wherein the first data packet is one of the at least one data packet, and the length of the first time length is less than 1 millisecond.

2. The method of claim 1, wherein before the relay base station sends the first packet to the donor base station within the first time period, the method further comprises:

the relay base station acquires a first quality of service (QCI) corresponding to the first data packet;

and under the condition that the first QCI is matched with a first preset QCI set, the relay base station adds the first data packet into the short TTI queue, wherein the first preset QCI set comprises at least one QCI.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

when the relay base station and the host base station establish a return link, the relay base station sends capability information of the relay base station to the host base station, wherein the capability information is used for identifying that the relay base station supports short TTI, and the return link is a link established when the relay base station initially accesses the host base station.

4. The method of claim 1 or 2, wherein the relay base station transmits the first data packet to the donor base station within the first time period, and wherein the method comprises:

the relay base station sends a first data packet to a host base station within a first time duration through a first time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI mode.

5. The method of claim 1 or 2, wherein the first duration is 2 symbols or 3 symbols in length in the time domain.

6. A method of data transmission, the method comprising:

a host base station receives at least one data packet sent by core network equipment;

the host base station determines a relay base station corresponding to a second data packet, wherein the second data packet is one of the at least one data packet;

and under the condition that the relay base station supports a short transmission time interval TTI, the host base station sends the second data packet to the relay base station within a first time length, wherein the length of the first time length is less than 1 millisecond.

7. The method of claim 6, wherein before the donor base station transmits the second packet to the relay base station for a first time period, the method further comprises:

the host base station acquires a second quality of service class identifier (QCI) corresponding to the second data packet;

under the condition that the second QCI is matched with a first preset QCI set, the host base station adds the second data packet into the short TTI queue, wherein the first preset QCI set comprises at least one QCI;

the sending, by the donor base station, a second packet to the relay base station within a first time duration includes:

and the host base station acquires the second data packet from the short TTI queue and sends the second data packet to the relay base station within the first time period.

8. The method according to claim 6 or 7, characterized in that the method further comprises:

when the host base station and the relay base station establish a backhaul link, the host base station receives the capability information of the relay base station sent by the relay base station;

9. The method according to claim 6 or 7, wherein the sending, by the donor base station, the second packet to the relay base station within the first time period comprises:

and the host base station sends a second data packet to the relay base station within a first time span through a second time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI (transmission time interval) mode.

10. The method of claim 6 or 7, wherein the first duration is 2 symbols or 3 symbols long in the time domain.

11. A relay base station, characterized in that the relay base station comprises:

an obtaining unit, configured to obtain at least one data packet from a short TTI queue when a relay base station supports a short TTI;

a sending unit, configured to send a first data packet to a host base station within a first time duration, where the first data packet is one of the at least one data packet, and the length of the first time duration is less than 1 millisecond.

12. The relay base station according to claim 11,

the obtaining unit is further configured to obtain a first quality of service class identifier QCI corresponding to the first packet;

the relay base station further includes: and the adding unit is used for adding the first data packet into the short TTI queue under the condition that the first QCI is matched with a first preset QCI set, wherein the first preset QCI set comprises at least one QCI.

13. The relay base station according to claim 11 or 12,

the sending unit is further configured to send capability information of the relay base station to the donor base station when a backhaul link is established between the relay base station and the donor base station, where the capability information is used to identify that the relay base station supports a short TTI, and the backhaul link is a link established when the relay base station initially accesses the donor base station.

14. The relay base station according to claim 11 or 12, wherein the transmitting unit is specifically configured to:

and sending a first data packet to a host base station within a first time duration through a first time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI (transmission time interval) mode.

15. The relay base station according to claim 11 or 12, wherein the length of the first duration in the time domain is 2 symbols or 3 symbols.

16. A donor base station, comprising:

a receiving unit, configured to receive at least one data packet sent by a core network device;

a determining unit, configured to determine a relay base station corresponding to a second data packet, where the second data packet is one of the at least one data packet;

a sending unit, configured to send the second packet to the relay base station within a first duration when the relay base station supports a short transmission time interval TTI, where a length of the first duration is less than 1 millisecond.

17. The donor base station of claim 16, wherein the donor base station further comprises: an acquisition unit and an addition unit; wherein the content of the first and second substances,

the obtaining unit is configured to obtain a second quality of service class identifier QCI corresponding to the second packet;

the adding unit is configured to add the second packet to the short TTI queue when the second QCI is matched with a first preset QCI set, where the first preset QCI set includes at least one QCI;

the sending unit is specifically configured to: and acquiring the second data packet from the short TTI queue, and transmitting the second data packet to the relay base station within the first time length.

18. The donor base station of claim 16 or 17,

the receiving unit is further configured to receive, when the donor base station establishes a backhaul link with the relay base station, capability information of the relay base station sent by the relay base station;

the determining unit is further configured to determine that the relay base station supports the short TTI according to the capability information of the relay base station.

19. The donor base station of claim 16 or 17,

the sending unit is specifically configured to: and sending each second data packet to the relay base station within a first time span through a first time-frequency resource, wherein the first time-frequency resource belongs to a first time-frequency resource set, and the first time-frequency resource set is a time-frequency resource reserved for the host base station to perform data transmission for the relay base station in a short TTI manner.

20. The donor base station of claim 16 or 17, wherein the first duration is 2 symbols or 3 symbols long in the time domain.

21. A communication device comprising a processor and a memory, the processor coupled with the memory, wherein the communication device is a relay base station or a donor base station;

the memory is used for storing programs;

the processor, configured to execute the program in the memory, to cause the communication device to perform the method according to any one of claims 1 to 5, or to cause the communication device to perform the method according to any one of claims 6 to 10.