CN111756459B

CN111756459B - Method and device for sending and receiving synchronous signals

Info

Publication number: CN111756459B
Application number: CN201910266905.6A
Authority: CN
Inventors: 刘凤威; 邱晶; 陈磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-29
Filing date: 2019-04-03
Publication date: 2021-11-19
Anticipated expiration: 2039-04-03
Also published as: CN111756459A

Abstract

The first node determines the availability of a symbol of a first resource set between a first hard resource set and a second hard resource set by receiving resource indication information sent by a superior node, so as to improve the resource utilization rate to the maximum extent. The method comprises the following steps: a first node receives resource indication information sent by a superior node, wherein the resource indication information is used for indicating the transmission direction of a first resource set, the first resource set is positioned between a first hard resource set and a second hard resource set, and the first hard resource set and the second hard resource set are continuous hard resources; the first node determines a first threshold value x and a second threshold value y according to the resource indication information; when t is₃‑t₁Is not less than x, and t₂‑t₄When the symbol is more than or equal to y, the first node determines that the first symbol in the first resource set is available; the first node communicates with the superior node on a first symbol according to the resource indication information.

Description

Method and device for sending and receiving synchronous signals

Technical Field

The present invention relates to communication technologies, and in particular, to a method and an apparatus for determining transmission resources of a relay node in a wireless communication system.

Background

With the continuous development of mobile communication technology, the spectrum resources are increasingly tense. In order to improve spectrum utilization, future base station deployments will be more intensive. In addition, dense deployment may also avoid the occurrence of coverage holes. Under a conventional cellular network architecture, a base station establishes a connection with a core network through an optical fiber. However, the deployment cost of optical fibers is very high. The wireless Relay Node (RN) establishes connection with the core network through the wireless return link, and can save part of optical fiber deployment cost.

In general, a wireless relay node establishes a wireless backhaul link with one or more superordinate nodes, and accesses a core network through the superordinate nodes. The wireless relay node may serve a plurality of subordinate nodes. The superior node of the relay node can be a base station or another relay node; the lower node of the relay node may be a terminal equipment (UE) or another wireless relay node.

A relay scheme supported by a New Radio (NR) of a Radio Access Network (RAN) of a fifth generation mobile communication (5th generation mobile network or 5th generation wireless system, 5G) is called Integrated Access and Backhaul (IAB), and an integrated access and backhaul relay node is called an IAB node.

And carrying out resource multiplexing on an access link and a return link of the IAB node in a time division, space division or frequency division mode. Taking a Time Division Multiplexing (TDM) scenario as an example, the backhaul link and the access link operate at different times, so the IAB node needs to switch between transceiving of the backhaul link and transceiving of the access link. When switching between the return link and the access link, if the conversion between the receiving and the sending of the power amplifier is not needed, the IAB node has the highest resource utilization rate. However, in the implementation, due to various factors such as the switching time of the power amplifier, the transmission distance, the non-ideal synchronization, and the like, the transmit-receive conversion time of the power amplifier cannot be ignored when the switch is performed between the backhaul link and the access link. The transmit-receive conversion time of the power amplifier affects the symbol resources transmitted over the return link. How to reduce the reduction of the spectrum efficiency caused by the transceiving conversion of the power amplifier is a problem to be considered by the 5G IAB.

Disclosure of Invention

Embodiments of the present application provide a method and an apparatus for determining resources in a relay system, which solve the problem of excessive overhead at a transition boundary when data transmission transition is performed between an MT (mobile terminal) and a DU (distributed unit) of an IAB node in the relay system.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, a method for determining resources in a relay system is provided, where an IAB node determines an available state of resources on an MT, so as to utilize symbol resources to the maximum extent and reduce overhead. The method comprises the following steps: a first node receives resource indication information sent by a superior node, wherein the resource indication information is used for indicating the transmission direction of a first resource set, the first resource set is positioned between a first hard resource set and a second hard resource set, and the first hard resource set and the second hard resource set are continuous hard resources; the first node determines a first threshold value x and a second threshold value y according to the resource indication information; when t is₃-t₁Is not less than x, and t₂-t₄When the symbol is more than or equal to y, the first node determines that the first symbol in the first resource set is available; wherein, t₁Is the end time, t, of the last symbol in the first set of hard resources₂Is the start time, t, of the first symbol in the second set of hard resources₃Is the start time of the first symbol, t₄Is the end time of the first symbol; the first node communicates with the superior node on the first symbol according to the resource indication information. In the technical scheme, the symbol resources are utilized to the maximum extent by determining the available state of the symbols on the first resource set, so that resource waste caused by resource overlapping by taking a subframe or a time slot as a unit is avoided, and the spectrum efficiency is improved.

In a possible implementation manner of the first aspect, the first threshold x and the second threshold y are different for different scenarios, and specifically, in different scenarios, the determining method includes:

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, the first threshold x ═ T_TR(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, x is 0; alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, x is 0; alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, x is T_RT(ii) a Alternatively, the first and second electrodes may be,

when the first symbol transmission direction in the second hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, y is T_RT(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, y is 0; or, when the first symbol transmission direction in the second hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, y is 0; alternatively, the first and second electrodes may be,

when the first symbol transmission direction in the second hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, y ═ T_TR；

T_RTTransition time, T, for the reception of a transmission by a first node_TRIs the transmit to receive transition time of the first node.

In a possible implementation manner of the first aspect, t is determined under different scenarios₃-t₁And t₂-t₄The parameters of (2) are different, and depend on different scenes, including:

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, t₃-t₁And t₂-t₄By a_DDIt is determined that,

alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, t₃-t₁And t₂-t₄By a_UDDetermination of Δ_UD＝TA+TA_offset-Δ_DD(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, t₃-t₁And t₂-t₄By a_DUDetermination of Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, t₃-t₁And t₂-t₄By a_UUDetermination of Δ_UU＝TA+TA_offset-Δ_DD-T_g(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, t₃-t₁And t₂-t₄By a_DDIt is determined that,

alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, t₃-t₁And t₂-t₄By a_UDDetermination of Δ_UD＝TA+TA_offset-Δ_DD(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, t₃-t₁And t₂-t₄By a_DUDetermination of Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, t₃-t₁And t₂-t₄By a_UUDetermination of Δ_UU＝TA+TA_offset-Δ_DD-T_g；

TA is timing advance, T_deltaFor timing offset, TA_offsetFor timing advance offset, T_gA transmit-receive transition time difference for an access link of the first node.

In one possible implementation of the first aspect, the IAB node may for some reason be handed over from one superordinate node to another superordinate node, which has not yet obtained the necessary parameters of the IAB node to determine the available symbol status at the time of handover to another superordinate node. Thus, the method comprises: the first node is switched from the first superior node to the second superior node; the first node sends T to the second superior node_deltaOr Δ_DD. In the above technical scheme, T is reported to the second superior node_deltaOr Δ_DDSo that the second superior node can report T according to the IAB node_deltaOr Δ_DDThe symbol state is determined, so that the symbol state of the terminal is kept all the time, and the resource utilization rate is improved.

In a possible implementation manner of the first aspect, the superior node may need some information of the IAB points to determine the available state of the symbols of the first resource set, and therefore, the first node reports the Δ to the superior node_UUOr is or

Or said T_g. In the above technical solution, the Δ is reported to the second superior node_UUOr is or

Or T_gSo that the second superior node can report the delta according to the IAB node_UUOr is or

Or T_gThe symbol state is determined, so that the symbol state of the terminal is kept all the time, and the resource utilization rate is improved.

In a possible implementation manner of the first aspect, the upper node may update the TA, and when the TA is updated, the upper node may update the TAThe IAB node may need to re-delta_UUAnd may cause the IAB node to re-determine available symbols for the first set of resources. The method comprises the following steps: the first node receives a TA updating command sent by the superior node, and updates delta according to the TA updating command_UU. In the above technical scheme, the TA update is performed, so that the network nodes keep synchronous, interference is avoided, and the re-determination of the available symbols of the first resource set is beneficial to improving the spectrum utilization rate.

In a second aspect, a method for determining resources in a relay system is provided, which is used for an IAB node to determine an available state of resources on an MT, so as to utilize symbol resources to the maximum extent and reduce overhead. The method comprises the following steps: the second node acquires a first hard resource set and a second hard resource set of the first node, wherein the first hard resource set and the second hard resource set are continuous hard resources, and the second node is a superior node of the first node; the second node determines a first resource set, wherein the first resource set is positioned between the first hard resource set and the second hard resource set; the second node acquires a first threshold value x and a second threshold value y; time difference D between the start time of the first symbol and the end time of the last symbol in the first set of hard resources_hGreater than x, and a time difference D between a start time of a first symbol and an end time of the first symbol in the second set of hard resources_eWhen y is greater than y, the second node determines that the first symbol in the first set of resources is available; the second node performs data transmission with the first node on the first symbol. In the technical scheme, the symbol resources are utilized to the maximum extent by determining the available state of the symbols on the first resource set, so that resource waste caused by resource overlapping by taking a subframe or a time slot as a unit is avoided, and the spectrum efficiency is improved.

In a possible implementation manner of the second aspect, the first threshold x and the second threshold y are different for different scenarios, and specifically, in different scenarios, the determining method includes:

when the transmission direction of the first resource set is downlink transmission, x is 0; alternatively, the first and second electrodes may be,

the last symbol transmission direction in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, x is T ═ T_RT(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, y is 0; alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, y is 0; alternatively, the first and second electrodes may be,

when the first symbol transmission direction in the second hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, y is T_TR；

T_RTA transition time, T, for the reception and transmission of the first node_TRA transmit to receive transition time for the first node.

In a possible implementation manner of the second aspect, the second node needs to send the resource indication information to the first node, so that the first node determines the availability status of the symbols in the first resource on the MT of the first node through the resource indication information. The method comprises the following steps: the second node sends resource indication information to the first node, wherein the resource indication information is used for indicating the transmission direction of the first resource set. In the above technical solution, the first node obtains the transmission direction of the first resource set on the MT by sending the resource indication information to the first node, so as to determine the state of the available symbol according to the transmission direction, thereby improving the spectrum efficiency.

In one possible implementation manner of the second aspect, the pattern reconfiguration indication further includes: a start time of the updated pattern hopping sequence and/or pattern configuration information. In the technical scheme, when the pattern hopping sequence and/or the pattern configuration information are reconfigured, the information of each node is kept consistent, and the situation that the measurement cannot be carried out or cannot be found when the nodes are not cooperated with each other is avoided.

In one possible implementation of the second aspect, the second node needs to obtain parameter information of the first node to determine the availability status of the symbols on the MT of the first node. The method comprises the following steps: the second node receives the delta reported by the first node_UUOr is or

Or T_gTA is the timing advance, Δ_UUReturning to the first node the time difference, T, of the uplink transmission frame to the access link uplink reception frame boundary_gA transmit-receive transition time difference for an access link of the first node. In the above technical solution, the second node may determine the available state of the symbol in the first resource set according to the parameter reported by the first node, so as to improve the spectrum utilization rate of the backhaul link of the first node.

In a possible implementation manner of the second aspect, D is determined under different scenarios_hAnd D_eSpecifically, depending on different scenarios, the method specifically includes:

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, D_hAnd D_eBy a_DDIt is determined that,

alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, D_hAnd D_eBy a_UDDetermination of Δ_UD＝TA+TA_offset-Δ_DD(ii) a Alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and the transmission direction of the first resource set is uplink transmissionIn downlink transmission, D_hAnd D_eBy a_DUDetermination of Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, D_hAnd D_eBy a_UUDetermination of Δ_UU＝TA+TA_offset-Δ_DD-T_g(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, D_hAnd D_eBy a_DDDetermining; alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, D_hAnd D_eBy a_UDDetermining; alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, D_hAnd D_eBy a_DUDetermining; alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, D_hAnd D_eBy a_UUDetermining;

In a possible implementation manner of the second aspect, the node number information includes: the method comprises the following steps of configuring one of a node number, a cell identification (cell ID), a Physical Cell Identification (PCI), a Radio Network Temporary Identifier (RNTI), an MAC address and an IP address.

In a possible implementation manner of the second aspect, the upper node may update the TA to achieve more accurate time synchronization, which may cause the second node to send a TA update command to the first node, thereby causing the second node to adjust the parameter, and report the parameterSo that the second node can determine the availability status of symbols on the first set of resources on the MT of the first node. The method comprises the following steps: the second node sends TA update command to the first node, the TA update command is used for updating delta by the first node_DD，Δ_UU，Δ_UDOr Δ_DU。

In another aspect of the present application, a first node is provided, where the first node is configured to implement the function of the method for determining resources in a relay system provided in any one of the foregoing possible implementation manners of the first aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the functions.

In a possible implementation manner, the first node includes a processor in a structure, and the processor is configured to support the ue to perform the method for determining resources in a relay system provided in the foregoing first aspect or any one of the possible implementation manners of the first aspect. Optionally, the first node may further comprise a memory having code and data stored therein, the memory being coupled to the processor, and a communication interface coupled to the processor or the memory.

In another aspect of the present application, a second node is provided, where the second node is configured to implement the function of the method for determining resources in a relay system provided in any one of the foregoing second aspect or any one of the foregoing possible implementation manners of the second aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the functions.

In a possible implementation manner, the second node includes a processor in a structure, and the processor is configured to support the network device to execute the function of the method for determining resources in the relay system provided in the second aspect or any one of the possible implementation manners of the second aspect. Optionally, the network device may further comprise a memory storing code required for the processing and/or baseband processor, the memory being coupled to the processor, and a communication interface coupled to the memory or the processor.

In a further aspect of the present application, a computer-readable storage medium is provided, which has instructions stored therein, which when run on a computer, cause the computer to perform the method for resource determination in a relay system provided in the first aspect or any one of the possible implementations of the first aspect, or the method for resource determination in a relay system provided in the second aspect or any one of the possible implementations of the second aspect.

In a further aspect of the present application, a computer program product is provided, which comprises instructions that, when run on a computer, cause the computer to perform the method for resource determination in a relay system as provided in the first aspect or any one of the possible implementations of the first aspect, or the method for resource determination in a relay system as provided in the second aspect or any one of the possible implementations of the second aspect.

In yet another aspect of the present application, a communication system is provided, the communication system comprising a plurality of devices, the plurality of devices comprising a first node, a second node; the first node is a first node provided in the foregoing aspects, and is configured to support the first node to perform the method for determining resources in the relay system provided in the foregoing first aspect or any possible implementation manner of the first aspect; and/or the second node is the second node provided in the foregoing aspects, and is configured to support the second node to perform the method for determining resources in a relay system provided in the foregoing second aspect or any possible implementation manner of the second aspect.

In yet another aspect of the application, an apparatus is provided, which is a processor, an integrated circuit or a chip, for performing the steps performed by the processing unit of the first node in the embodiments of the present invention, for example, determining the availability status of symbols in the first set of resources. The apparatus is further configured to perform the first node processing or actions already described in the foregoing other aspects or embodiments, and therefore, the details are not repeated here.

In yet another aspect of the application, another apparatus is provided, which is a processor, an integrated circuit or a chip, for performing the steps performed by the processing unit of the second node in the embodiments of the present invention. The second node is supported to perform the determination of the availability status of the symbols in the first set of resources as described in the previous embodiments. The other apparatus is further configured to perform the processing or actions of the second node already described in the foregoing other aspects or embodiments, and is not described here again.

It can be understood that the apparatus, the computer storage medium, or the computer program product of the method for determining resources in a relay system provided above are all configured to execute the corresponding method provided above, and therefore, the beneficial effects achieved by the method can refer to the beneficial effects in the corresponding method provided above, and are not described herein again.

Drawings

Fig. 1 is an IAB communication system provided in an embodiment of the present application;

fig. 2 is a frame structure of an upper node or between an IAB node and a donor base station according to an embodiment of the present application;

fig. 3 is a schematic diagram of a resource configuration of an IAB node according to an embodiment of the present application;

fig. 4 is a schematic diagram illustrating a relationship between H/S resources of DUs and available or unavailable resources of MT according to an embodiment of the present application;

fig. 5 is a schematic diagram illustrating that an MT of an IAB node performs downlink reception and a DU performs downlink transmission according to the embodiment of the present application;

fig. 6 is a schematic diagram illustrating that an MT of an IAB node performs uplink transmission and a DU performs downlink transmission according to the embodiment of the present application;

fig. 7 is a schematic diagram illustrating that an MT of an IAB node performs downlink reception and a DU performs uplink reception according to the embodiment of the present application;

fig. 8 is a schematic diagram illustrating that an MT of an IAB node performs uplink transmission and a DU performs uplink reception according to the embodiment of the present application;

FIG. 9 is a flowchart of a method for determining resources according to an embodiment of the present application;

FIG. 10 is a diagram illustrating an availability status of one or more symbols in a first set of resources after determining the first set of hard resources according to an embodiment of the present application;

FIG. 11 is a diagram illustrating an example of determining an availability status of one or more symbols in a first set of resources prior to a second set of hard resources according to an embodiment of the present disclosure;

fig. 12 is a schematic diagram illustrating that transmission states of two consecutive first resource sets on the IAB node MT are different according to an embodiment of the present application;

fig. 13 is a schematic diagram of a possible structure of a first node according to an embodiment of the present disclosure;

fig. 14 is a schematic diagram of a possible logical structure of a first node according to an embodiment of the present disclosure;

fig. 15 is a schematic diagram of a possible structure of a second node according to an embodiment of the present disclosure;

fig. 16 is a schematic diagram of a possible logic structure of a second node according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Where in the description of the present application, "/" indicates an OR meaning, for example, A/B may indicate A or B, unless otherwise indicated. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Also, in the description of the present application, "a plurality" means two or more than two unless otherwise specified. "including one or more of a or B" in the embodiments of the present application may mean: the three cases of A, A and B are included. "include one or more of A, B or C" in the embodiments of the present application may mean: including A and B and C, including A and B, including A and C, including B and C, including A, including B, including C.

It should be understood that the names of all nodes and messages in the present application are only names set for convenience of description in the present application, and the names in the actual network may be different, and it should not be understood that the present application defines the names of various nodes and messages, on the contrary, any name having the same or similar function as the node or message used in the present application is considered as a method or equivalent replacement in the present application, and is within the protection scope of the present application, and will not be described in detail below.

In consideration of the high bandwidth of a future wireless network, NR considers introducing an IAB scheme to further reduce deployment cost, improve deployment flexibility, and thus introduces integrated access and backhaul relays, and the present application refers to a relay node with integrated access and backhaul as an integrated access and backhaul node (IAB node) to distinguish relays of a Long Term Evolution (LTE) system.

In order to better understand the method and the apparatus for determining resources in a relay system disclosed in the embodiments of the present invention, a network architecture used in the embodiments of the present invention is described below. Referring to fig. 1, fig. 1 is a schematic structural diagram of a communication system to which the present embodiment is applied.

It should be noted that, the communication systems mentioned in the embodiments of the present application include, but are not limited to: a narrowband internet of things (NB-IoT) system, a Wireless Local Access Network (WLAN) system, an LTE system, a next generation 5G mobile communication system, or a communication system after 5G, such as an NR, device to device (D2D) communication system.

In the communication system shown in fig. 1, an integrated access and backhaul IAB system is presented. An IAB system at least includes a base station 100, one or more terminal equipments (terminal)101 served by the base station 100, one or more relay node IAB nodes, and one or more terminal equipments 111 served by the IAB node 110. Typically, the base station 100 is called a donor next generation node B (DgNB), and the IAB node 110 is connected to the base station 100 via a wireless backhaul link 113. The Donor base station is also referred to as a Donor node in this application, i.e., a Donor node. Base stations include, but are not limited to: an evolved node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved node B (HNB)), a Base Band Unit (BBU), an LTE (evolved LTE, LTE) base station, an NR base station (next generation node B, gbb), and the like. Terminal devices include, but are not limited to: user Equipment (UE), a mobile station, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a terminal, a wireless communication device, a user agent, a Station (ST) in a Wireless Local Access Network (WLAN), a cellular phone, a cordless phone, a session initiation protocol (SlP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device, other processing devices connected to a wireless modem, a vehicle mounted device, a wearable device, a mobile station in a future 5G network, and a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc. The IAB node is a specific name of a relay node, and is not limited to the configuration of the present application, and may be one of the base station and the terminal device having a relay function, or may be in an independent device form.

The integrated access and backhaul system may further include a plurality of other IAB nodes, such as IAB node 120 and IAB node 130, where IAB node 120 is connected to IAB node 110 via wireless backhaul link 123 for access to the network, IAB node 130 is connected to IAB node 110 via wireless backhaul link 133 for access to the network, IAB node 120 serves one or more terminal devices 121, and IAB node 130 serves one or more terminal devices 131. In fig. 1, IAB node 110 and IAB node 120 are both connected to the network via a wireless backhaul link. In the present application, the wireless backhaul links are all from the perspective of the relay node, for example, the wireless backhaul link 113 is the backhaul link of the IAB node 110, and the wireless backhaul link 123 is the backhaul link of the IAB node 120.

As shown in fig. 1, one IAB node, e.g., 120, may be connected to the network by connecting to another IAB node 110 via a wireless backhaul link, e.g., 123, and the relay node may be connected to the network via multiple stages of wireless relay nodes. It should be understood that the IAB node is used herein for descriptive purposes only and does not mean that the solution of the present application is used only for NR, and in the present application, the IAB node may refer to any node or device having a relay function in a general way, and the use of the IAB node and the relay node in the present application should be understood to have the same meaning.

In general, a lower node may be regarded as one UE of an upper node. It should be understood that in the integrated access and backhaul system shown in fig. 1, one IAB node is connected to one upper node. However, in future relay systems, in order to improve the reliability of the wireless backhaul link, one IAB node, e.g. 120, may have multiple upper nodes simultaneously serving one IAB node. IAB node 130 as shown may also be connected to IAB node 120 via backhaul link 134, i.e., IAB node 110 and IAB node 120 are both superordinate nodes of IAB node 130. The names of the

IAB nodes

110, 120, 130 do not limit the scenario or network in which they are deployed, and may be any other names such as relay, RN, etc. The use of an IAB node in this application is only a requirement for ease of description.

In fig. 1, the wireless links 102, 112, 122, 132, 113, 123, 133, 134 may be bidirectional links including uplink and downlink transmission links, and in particular, the

wireless backhaul links

113, 123, 133, 134 may be used for the upper node to provide service for the lower node, such as the upper node 100 providing wireless backhaul service for the lower node 110. It should be appreciated that the uplink and downlink of the backhaul link may be separate, i.e., the uplink and downlink are not transmitted through the same node. The downlink transmission refers to transmission of information or data to a higher node, such as the node 100, and to a lower node, such as the node 110, and the uplink transmission refers to transmission of information or data to a lower node, such as the node 110, and to a higher node, such as the node 100. The node is not limited to being a network node or a terminal device, for example, in the D2D scenario, a terminal device may serve as a relay node for other terminal devices. The wireless backhaul link may in turn be an access link in some scenarios, such as backhaul link 123 may also be considered an access link for node 110, and backhaul link 113 is also an access link for node 100. For node 110, link 113 is referred to as a superior backhaul link (parent BH), link 123 is referred to as a subordinate backhaul link (child BH), and link 112 is referred to as an access link. It should be understood that the above-mentioned upper node may be a base station, and may also be a relay node, and the lower node may also be a terminal device having a relay function, for example, in the D2D scenario, the lower node may also be a terminal device.

The relay nodes, e.g. 110, 120, 130, shown in fig. 1 may have two existing forms: one is existing as an independent access node, and can independently manage terminal equipment accessed to a relay node, where the relay node usually has an independent physical cell identifier (PCl), and the relay in this form usually needs to have a complete protocol stack function, such as a Radio Resource Control (RRC) function, and is usually called a layer 3 relay; while another type of relay node and Donor node, such as Donor eNB and Donor gNB, belong to the same cell, the management of the user is managed by a Donor base station, such as a Donor node, and such a relay is generally called a layer 2 relay.

The layer 2 relay generally exists as a DU of a base station DgNB under a control and bearer split (CU-DU) architecture of NR, and communicates with CUs through an F1-AP (F1 application protocol) interface or a tunnel protocol. The tunneling protocol may be, for example, a GTP (GTP) protocol, and the F1-AP may be a F1-AP enhanced interface, which is not described in detail.

The Donor node is a node through which a core network can be accessed, or an anchor base station of a radio access network through which a network can be accessed. And the anchor point base station is responsible for receiving the data of the core network and forwarding the data to the relay node, or receiving the data of the relay node and forwarding the data to the core network.

For convenience of description, the following explains the basic terms or concepts used in the present application.

The upper node: the node providing wireless backhaul link resources, e.g., 110, is the superordinate node referred to as the IAB node 120. The upper level node may also be referred to as an upstream node. It should be understood that the superordinate node is not limited to the immediate superordinate node providing wireless backhaul link resources, including nodes providing wireless backhaul link resources on all links providing transmission to the hosting base station. The direct upper node refers to a node that directly provides transmission resources for the relay node, for example, the IAB node 110 is a direct upper node of the IAB node 120.

A subordinate node: nodes that use backhaul link resources for data transmission to or reception from the network are referred to as subordinate nodes. For example, 120 is called a relay node 110 subordinate node, and the network is a network on a core network or other access networks, such as the internet, a private network, and the like. Similarly, the subordinate node is not limited to the immediate subordinate node for which wireless backhaul link resources are provided, including nodes that provide wireless backhaul link resources on all links providing transmission to the target node. The immediate subordinate node refers to a node for which transmission resources are directly provided, for example, the IAB node 120 is an immediate subordinate node of the IAB node 110.

And accessing a link: a link between the UE and an IAB node, or between the UE and an IAB donor node (IAB node). Alternatively, the access link may comprise a radio link used by a node to communicate with its subordinate nodes. The access link includes an uplink access link and a downlink access link. The uplink access link is also referred to as uplink transmission of the access link, and the downlink access link is also referred to as downlink transmission of the access link.

A return link: a link between an IAB node and an IAB child node (IAB child node), or an IAB node and an IAB parent node (IAB parent node). The return link comprises an IAB node and an IAB child node, or a downlink transmission link of the IAB node and an IAB parent node; the backhaul link also includes links for uplink transmissions by the IAB node and the IAB child nodes, or the IAB node and the IAB parent node. An IAB node transmitting data to an IAB parent node or receiving an uplink transmission from an IAB child node is referred to as an uplink transmission of a backhaul link. The reception of data transmission by an IAB parent node or the transmission of data to an IAB child node is called downlink transmission of a backhaul link. To distinguish between the UE and the IAB node, the backhaul link between the IAB node and the IAB parent node is called a superior backhaul link (parent BH), and the backhaul link between the IAB node and the IAB child node is called a subordinate backhaul link (child BH).

Waveform parameters: refers to parameters of a set of subcarriers, or physical subcarriers of a certain bandwidth or a part of a carrier, and the waveform parameters include at least one of the following parameters: subcarrier spacing, Cyclic Prefix (CP) length, time interval (TTI), symbol length, number of symbols, μ. Where μ is an integer greater than or equal to 0, and may take values from 0 to 5, each μ corresponding to a particular subcarrier spacing and CP, the relationship between subcarrier spacing and μ being Δ f-2^μ·15[kHz]Where af is the subcarrier spacing, Hz is the basic unit of frequency, and kHz denotes kilo Hz, i.e. kilohertz.

Time slot: which is the basic time domain unit in NR, a slot may contain 14 or 12 symbols, depending on the CP length in the waveform parameters employed for the slot. It should be understood that in some cases, the time slots and subframes may be identical, for example, when the subcarrier spacing in the waveform parameters is 15 KHz. Also, the slot should not be limited to the above definition, and in some cases, a mini-slot may also be defined, i.e., one or more symbols may also be referred to as one slot, and the slot in this application includes the concept of a mini-slot. The symbol generally refers to an Orthogonal Frequency Division Multiplexing (OFDM) symbol, but it should not be understood that the symbol is limited to an OFDM symbol, and may include other waveform symbols, such as a single-carrier OFDM symbol. One subframe may be, for example, 1ms, and one subframe may include one or more slots. When one subframe includes only one slot, the subframe and the slot are the same. Hereinafter, a slot or a subframe refers to a slot or a subframe, where the subframe and the slot are the same in some cases and different in some cases, and therefore, the slot or the subframe generally refers to a scheduling basic unit, where the slot may be a mini-slot, and will not be described in detail below.

Wave beam: is a communication resource. The beam may be a wide beam, or a narrow beam, or other type of beam. The technique of forming the beam may be a beamforming technique or other technical means. The beamforming technique may be embodied as a digital beamforming technique, an analog beamforming technique, a hybrid digital/analog beamforming technique. Different beams may be considered different resources. The same information or different information may be transmitted through different beams. Alternatively, a plurality of beams having the same or similar communication characteristics may be regarded as one beam. A beam may be formed by one or more antenna ports for transmitting data channels, control channels, sounding signals, and the like, for example, a transmit beam may refer to a distribution of signal strengths formed in different spatial directions after signals are transmitted through the antenna, and a receive beam may refer to a distribution of wireless signals received by the antenna array in different spatial directions with emphasis or attenuation. It is to be understood that the one or more antenna ports forming one beam may also be seen as one set of antenna ports. In the current NR protocol, beams can be represented by a quasi co-location (QCL) relationship of antenna ports (antenna ports), specifically, two signals of the same beam have a QCL relationship with respect to spatial rx parameters (spatial Rxparameter), i.e. QCL-Type D in the protocol: { Spatial Rx parameter }. The beam may be specifically represented in the protocol by identification of various signals, such as a resource ID of CSI-RS, a time domain index of SS/PBCH, a resource ID of SRS (sounding signal), a resource ID of TRS (tracking reference signal), and the like. The antenna port is a logical concept, which has no one-to-one correspondence relationship with physical antennas, and is a logical unit formed by one or more physical antennas for transmitting a signal or a signal stream.

In NR, an IAB node includes two main functions, one is a mobile-termination (MT) function and the other is a Distributed Unit (DU) function. The IAB node may perform uplink transmission and/or downlink transmission with the superordinate node on the MT. The IAB node may perform uplink transmission and/or downlink transmission with the subordinate node on the DU.

Fig. 2 shows a frame structure between an IAB node and a donor base station or an upper node. Fig. 2 shows only the frame structure of a DU of a donor base station or an upper node. In fig. 2, 210 is a frame structure of a host base station or an upper node, where 211 is a downlink transmission frame structure and 212 is an uplink transmission frame structure. 220 is the frame structure of an IAB node MT and 230 is the frame structure of an IAB node DU. Among them, 221 is a frame structure when the IAB node MT performs downlink transmission, 222 is a frame structure when the IAB node MT performs uplink reception, 231 is a frame structure when the IAB node DU performs downlink transmission, and 232 is a frame structure when the IAB node DU performs uplink reception. In fig. 2, it is assumed that the frame timing of the IAB node DU is synchronized with the frame timing of the upper node.

Fig. 3 is a schematic diagram of resource configuration of an IAB node in NR. Fig. 3 is an example of Time Division Duplex (TDD), in which MT resources of an IAB node can be configured as downlink (D), uplink (U), and Flexible (F) types. The resource of the F type may be configured for uplink or downlink transmission, and whether the resource is specifically used for uplink transmission or downlink transmission depends on the signaling configuration.

The DU resources of the IAB node can be configured into four types, i.e., downlink, uplink, flexible, and unavailable (Null, N). Further, the downlink, uplink, and flexible resources of the DU can be further divided into hard (hard, H) resources and soft (soft, S) resources. Wherein, hard resource of DU means resource that DU is always available. Soft resource of the DU, an indication that whether the DU is available requires reliance on an upper level node (e.g., a donor node). In fig. 3, the upper node controls the use of S resources in the IAB node DU by Downlink Control Information (DCI) in a downlink slot or subframe. And the H resource and the S resource are configured semi-statically by the host base station or the superior node through RRC, or configured semi-statically by the host base station through F1-AP protocol.

The MT of the IAB node is connected to the DU of the superior node, and the DU of the IAB node is connected to the MT of the inferior node. After going through a semi-static (e.g., through RRC signaling) resource configuration, the IAB node can get the resource configuration of its MT resources and DU resources, respectively. For example, the transmission direction (D/U/F) of the MT resource and the DU resource, the type (soft/hard) of the DU resource, the location of the NULL resource of the DU, and the like may be included.

As can be seen from fig. 3 and table 1 below, for an IAB node, MT resources (e.g., MT resources corresponding to 1, 6, 7, and 8 time slots) corresponding to hard resources of its DU (e.g., DU resources corresponding to 1, 6, 7, and 8 time slots) are not available. It should be understood that the slot number in fig. 3 may also be a subframe number or a symbol number, and the following description mainly takes the slot as an example and is not repeated.

Specifically, with reference to the foregoing description, the MT of the IAB node shares three types of resources, and the DU of the IAB node shares 7 types of resources, and after combining two by two, possible transceiving conditions of the MT of the IAB node and the corresponding DU are shown in table 1 and table 2 below, where table 1 is a resource configuration situation under various possible resource type combinations of the MT and the DU in a time division multiplexing scenario. Table 2 shows resource allocation conditions in various possible resource type combinations of MT and DU in a Space Division Multiplexing (SDM) scenario.

TABLE 1

TABLE 2

In tables 1 and 2 above, the meanings of each symbol are as follows:

"MT: tx "indicates that the MT should transmit after being scheduled;

"DU: tx "indicates that the DU can be transmitted;

"MT: rx "indicates that the MT is capable of receiving (if there is a signal to receive);

"DU: rx "indicates that the DU can schedule uplink transmission of a subordinate node;

"MT: Tx/Rx "indicates that the MT should transmit or receive after being scheduled, but transmission and reception do not occur simultaneously;

"DU: Tx/Rx "indicates that the DU can transmit or receive transmission of a subordinate node, but transmission and reception do not occur simultaneously;

"IA" denotes an indication that DU resources are available, either explicitly or implicitly;

"INA" indicates that DU resources are explicitly or implicitly indicated as unavailable;

"MT: NULL' means that the MT does not transmit and does not have to have receiving capability;

"DU: NULL' means that the DU does not transmit and does not receive transmissions of the lower node.

The TDM scenario is mainly considered in the present application, but the scheme of the present application may also be extended to SDM, frequency-division multiplexing (FDM), or full duplex, and other scenarios. For TDM scenarios, MT resources corresponding to hard resources of the DU are not available.

Specifically, on the unavailable resources of the MT (e.g., MT resources corresponding to

slots

1, 6, 7, and 8 in fig. 5):

(1) the MT does not expect the upper node to schedule it on these resources;

(2) the MT does not receive or transmit reference signals on these resources;

(3) the MT does not perform Physical Downlink Control Channel (PDCCH) monitoring on these resources, i.e. if the search space coincides with these resources, the MT of the IAB node abandons the coincident search space monitoring.

It should be understood that the MT may have the remaining unavailable resources in addition to the MT unavailable resources corresponding to the DU hard resources.

After the semi-static configuration is completed, the upper node continues to dynamically indicate the availability of the soft type resource of its DU resource for the IAB node through dynamic signaling (e.g., Downlink Control Information (DCI)), for example, the upper node indicates the availability of the soft type resource of the IAB node by using a dedicated DCI or a dedicated DCI field, for convenience of description, information included in the dynamic signaling is referred to as indication information, and the dedicated DCI or the dedicated DCI field may be collectively referred to as indication DCI.

The dynamic indication described above may be implemented in a variety of ways.

In one implementation, this may be done by way of an explicit indication.

For example, the upper node directly indicates the availability of soft type resources of the IAB node DU resources, and may also indicate the transmission direction of part (e.g., F type) of soft resources (e.g., DU resources corresponding to the 4 th and 5th slots in fig. 5) and the like.

In another implementation, this may be done by way of an implicit indication.

For example, the superior node indicates whether the MT resource (e.g., the available resource of the MT) of the IAB node is released (or, in other words, is available), and the IAB node determines the availability of the soft type resource of its own DU resource according to the indication of the superior node to the MT resource.

When the DU of the IAB node is configured as hard resources, the IAB node typically transmits in its entirety over the time slot configured as hard resources. The meaning of the full transmission is that all symbols on the slot configured as hard resources are considered available by the IAB node. Further, the hard resources of the IAB node may be considered as always available resources. For a DU hard resource, the IAB node can always communicate with the subordinate node on this resource, regardless of the scheduling configuration of the MT.

In one implementation, the partial periodic signals of the IAB node DU, including but not limited to periodic CSI-RS, SRS, are configured by the donor node and signaled to the UE or subordinate node of the IAB node by RRC signaling. At this time, the part of the periodic signal configured by the donor for the IAB node should be located in the hard resource of the IAB node DU.

Fig. 4 is a schematic diagram illustrating a relationship between H/S resources of DUs and available or unavailable resources of MT according to an embodiment of the present application. The symbols are shown in fig. 4 as an example. Wherein, the H symbol represents hard resource, the S symbol represents soft resource, a represents available, and NA represents unavailable. It should be understood that fig. 4 is only one example, where a symbol may also be a slot or a subframe.

Fig. 4 shows 7 symbols, where symbol 0 and symbol 6 are hard symbols of DU, which is always available. In fig. 4, it is assumed that resources are allocated between the MT and the DU of the IAB node in a TDM manner, and corresponding

MT symbols

0 and 6 are unavailable symbols. In the figure, symbols 1 to 5 are soft symbols of DU, and it can be seen from table 1 that the corresponding MT should be a usable symbol.

As can be seen from fig. 2 and 4, if a certain slot or subframe or symbol is configured as hard resource on the DU of the IAB node, the corresponding symbol is not available on the MT. Further, if the resource on the DU of a certain IAB node is configured as a hard resource, the resource overlapping the hard resource on the MT is not available. Here, the resource may be a slot or a subframe or a symbol, which is not described in detail below.

However, the MT and DU of the IAB node have different frame boundaries or symbol boundaries when performing data transmission or reception, so that the MT resources and DU resources of the IAB node are not aligned in the time domain. Generally, the frame timing (or symbol timing) deviation of the MT and DU of the IAB node is caused by the transmission delay between the IAB node and the upper node. In addition, some other factors, such as the deviation T of the receiving time of the uplink frame of the DU of the IAB node from the transmitting time of the downlink frame_gFrame timing offset may also result.

When determining the available symbols of the MT of the IAB node, the IAB node and the upper node not only need the resource configuration information of the IAB node DU, but also need the frame timing (or symbol timing) offset information of the MT and the DU of the IAB node.

When the IAB node performs data transmission conversion on the DU and data transmission on the MT, one or more symbols on the MT of the IAB node cannot be used for data transmission at the conversion boundary. In order to improve spectrum efficiency, it is necessary to minimize the number of resources that are not available on the MT, and how to determine which resources are not available or are available is a problem to be solved by the present application.

Typically, the IAB node does not communicate with the superordinate node at the unavailable symbol of the MT. Specifically, if a part of symbols of resources of a higher-layer configuration signal, such as PDCCH detection, periodic CSI-RS reception, periodic SRS transmission, etc., are located in an MT-unavailable symbol, the MT does not transmit or receive the signal. Furthermore, the IAB node MT does not expect it to be located in the MT unavailable symbol for dynamic scheduling or indication signals including, but not limited to, PDSCH, DMRS for PDSCH, PUSCH, DMRS for PUSCH, PUCCH for feeding back HARQ-ACK. Alternatively, if the dynamically scheduled data channel, e.g., PDSCH or PUSCH, occupies resources including unavailable symbols, the IAB node and the superordinate node rate-match for the unavailable symbols when transmitting this channel.

Technical problem in different scenarios, there are different situations in the amount of resources available or unavailable on the MT of the IAB node. The embodiment of the application illustrates a possible scene and a time difference calculation method.

Fig. 5 shows a scenario in which the MT of the IAB node performs downlink reception and the DU performs downlink transmission, where DL in the figure represents downlink (downlink), and is not described again. Two possible scenarios are included, fig. 5(a) is that the hard symbol 501 on the DU of the IAB node is sent downstream, while the

symbols

511 and 512 on the MT are received downstream. Fig. 5(b) shows the downstream reception of

symbols

513 and 514 on the MT of the IAB node, while the downstream transmission is carried out on hard symbols 502 on the DU. It should be understood that fig. 5 only uses symbols as an example, and may also be subframes or slots, which are not described in detail below.

In fig. 5(a), since hard symbol 501 of the IAB node DU is in the transmitting state, and

symbols

511 and 512 of the IAB node MT are in the receiving state, when the IAB node switches from DU transmitting to MT receiving state, the power amplifier needs to switch from transmitting to receiving state, and this switching needs a certain switching time, denoted as T_TR. There is a certain time deviation between the MT downlink frame receiving time of the IAB node and the downlink frame sending time of the DU, and the time deviation is recorded as delta_DDWherein the first bit of the subscript indicates the transmission direction of the MT and the second bit of the subscript indicates the transmission direction of the DU, the same as follows, no longerThe description is given. Assuming that the downlink transmissions of the upper node and the IAB node are generally synchronized in the TDD system, Δ_DDTypically caused by propagation delay from the superordinate node to the IAB node. In practice, however, due to timing imperfections, Δ_DDAnd is generally not exactly equal to the propagation delay.

Similarly, in fig. 5(b), since the symbol 513 and the symbol 514 of the IAB node MT are in the receiving state, and the hard symbol 502 of the IAB node DU is in the transmitting state, when the IAB node transitions from the MT receiving state to the DU transmitting state, the power amplifier needs to transition from the receiving state to the transmitting state, and this transition needs a certain transition time, denoted as T_RT。

As can be seen from fig. 5(b), the symbol 514 of the IAB node MT extends after the hard symbol 502 of the DU, and therefore the symbol 514 is not available for downlink transmission of the MT. Due to Delta_DDThe transmission delay is mainly caused by propagation delay, and the power amplifier of the IAB node needs a certain conversion time from the transmission of the DU to the reception of the MT, or from the reception of the DU from the MT to the transmission, namely, the transmission time corresponds to T respectively_TRAnd T_RT。

The determination of whether one or more symbols following the hard symbol 501 of an IAB node DU are available depends on delta_DDAnd T_TRThe relationship (2) of (c). Let t be the end time of the hard symbol 501 of the IAB node DU₁The start time of each symbol on the MT, e.g. symbol 511 or symbol 512, is t₃Then determining whether resources on the MT are available depends on t₃-t₁And T_TRThe relationship (2) of (c). When t is₃-t₁≥T_TR(or t)₃-t₁＞T_TR) Then the start time on MT is t₃Is available; when t is₃-t₁＜T_TR(or t)₃-t₁≤T_TR) Then the start time on MT is t₃Is not available.

It should be understood that t₃-t₁Can be represented by_DDThus obtaining the product. For example, when the indexes of the symbol 501 and the symbol 511 are consecutive, i and i +1, respectively, and the lengths of the two symbols are the same, Δ_DD＝t₃-t₁。

For example, whenΔ_DD≥T_TRThen the symbol 511 may be used for downlink transmission on the MT. And if Δ_DD＜T_TRThen the symbol 511 is not available. If Δ_DD+T_s＜T_TRThen the second symbol 512 is not available, where T_sIs the length of the symbol, T_sThe magnitude of which depends on the waveform parameter, Δ_DD+T_sThe interval from the end time of the symbol 501 to the start time of the symbol 512.

Whether one or more resources preceding the hard symbol 502 of an IAB node DU are available also depends on delta_DDAnd T_TRThe relationship (2) of (c). Let the start time of the hard symbol 502 of the IAB node DU be t₂The ending time of each symbol on the MT, e.g., symbol 513 or symbol 514, is t₄Then determining whether resources on the MT are available depends on t₂-t₄And T_RTThe relationship (2) of (c). When t is₂-t₄≥T_RT(or t)₂-t₄＞T_RT) When it is, the end time on MT is t₄Is available; when t is₂-t₄＜T_RT(or t)₂-t₄≤T_RT) When it is, the end time on MT is t₄Is not available.

For example, the ending time of the symbol 514 in FIG. 5(b) is later than the starting time of the hard symbol 502 of the IAB node DU, so t₂-t₄< 0, therefore, the symbol 514 cannot be used for transmission of the MT. Above suppose T_TRAnd T_RTAre both greater than 0.

It should be understood that t₂-t₄Can be represented by_DDThus obtaining the product.

Fig. 6 shows a scenario in which the MT of the IAB node performs uplink transmission and the DU performs downlink transmission. UL in fig. 6 indicates uplink (uplink). The difference with fig. 5 is that the resources of the IAB node MT are advanced by a time denoted as Δ_UDThe time difference between the MT uplink transmission frame of the IAB node and the downlink transmission frame of the DU is shown. In the scenario shown in fig. 6, since both MT and DU are in the transmitting state, the power amplifier does not need to perform the transition, and there is no transition time. In TDM scene, only if MT uplink symbol is aligned with DU downlink hard symbolWhen the connection is coincident, it is considered as an unavailable resource. Whereas in an SDM scenario, the two, even if coincident, may be considered as available resources.

Similarly, in the TDM scenario, assume the end time of the hard symbol 601 of the IAB node DU in FIG. 6(a) to be t₁The start time of each symbol on the MT, e.g., symbol 611 or symbol 612, is t₃Then determining whether resources on the MT are available depends on t₃-t₁. When t is₃-t₁Not less than 0 (or t)₃-t₁> 0), then the start time on MT is t₃Is available; when t is₃-t₁< 0 (or t)₃-t₁Not more than 0), then the start time on the MT is t₃Is not available.

It should be understood that t₃-t₁Can be represented by_UDThus obtaining the product.

When the resource before the hard symbol 602 of the DU is used for MT uplink transmission, since there is a certain advance in uplink transmission, generally Δ is_UD> 0, is an available resource.

Fig. 7 shows a scenario in which the MT of the IAB node performs downlink reception and the DU performs uplink reception. Because the MT and DU of the IAB node are in receiving state, there is no switching time of power amplifier. In TDM scenarios, an MT downlink resource is considered as an unavailable resource only if it directly coincides with a DU uplink hard symbol (or resource). Whereas in an SDM scenario, the two, even if coincident, may be considered as available resources.

Similar to fig. 5, since the MT of the IAB node receives downlink, the downlink received frame of the MT has a certain time delay relative to the uplink received frame of the DU, and this time delay is denoted as Δ_DU。

Assume that the end time of hard symbol 701 of an IAB node DU in FIG. 7(a) is t₁The start time of each symbol on the MT,

e.g. symbol

711 or 712, is t₃Then determining whether resources on the MT are available depends on t₃-t₁. When t is₃-t₁Not less than 0 (or t)₃-t₁> 0), then the start time on MT is t₃Is available; when t is₃-t₁< 0 (or t)₃-t₁Not more than 0), then the start time on the MT is t₃Is not available.

Let the start time t of the hard symbol 702 of the IAB node DU₂The ending time of each symbol on the MT, such as symbol 713 or symbol 714, is t₄Then determining whether resources on the MT are available depends on t₂-t₄. When t is₂-t₄Not less than 0 (or t)₂-t₄> 0), the end time on MT is t₄Is available; when t is₂-t₄< 0 (or t)₂-t₄Less than or equal to 0), the end time on the MT is t₄Is not available.

Here, t is₃-t₁And t₂-t₄All can be formed by_DUThus obtaining the product.

Fig. 8 shows a scenario in which the MT of the IAB node performs uplink transmission and the DU performs uplink reception. Fig. 8(a) shows that the DU is received in uplink and the MT transmits in uplink. Fig. 8(b) shows that the MT performs uplink transmission and the DU receives uplink. For the conversion between the MT uplink transmission and the DU uplink reception, the conversion interval is mainly due to the power release on and power amplifier off time required for transmitting the MT uplink. Therefore, in fig. 7(a), the transition interval is placed before and after the MT upstream symbol.

In fig. 8(a), since the hard symbol 801 of the IAB node DU is in the receiving state, and the

symbols

811 and 812 of the IAB node MT are in the transmitting state, when the IAB node switches from DU receiving to MT transmitting state, the power amplifier needs to switch from receiving to transmitting state, and this switching needs a certain switching time, denoted as T_RT。

Here, the time offset of the MT uplink transmission frame with respect to the DU uplink reception frame is denoted by Δ_UU. In fig. 8(a), it is assumed that the uplink transmission frame of the MT precedes the uplink reception frame of the DU.

Similarly, in fig. 8(b), since the

symbols

813 and 814 of the IAB node MT are in the transmitting state and the hard symbol 802 of the IAB node DU is in the receiving state, when the IAB node transitions from the MT transmitting state to the DU receiving state, the power amplifier needs to transition from the transmitting state to the receiving state, and this transition needs a certain transition timeBetween, and is marked as T_TR。

Let t be the end time of the hard symbol 801 of the IAB node DU in FIG. 8(a)₁The start time of each symbol on the MT, e.g., symbol 811 or symbol 812, is t₃Then determining whether resources on the MT are available depends on t₃-t₁And T_RTThe relationship (2) of (c). When t is₃-t₁≥T_RT(or t)₃-t₁＞T_RT) Then the start time on MT is t₃Is available; when t is₃-t₁＜T_RT(or t)₃-t₁≤T_RT) Then the start time on MT is t₃Is not available.

Similarly, assume the start time of the hard symbol 802 of the IAB node DU is t₂The ending time of each symbol on the MT, such as symbol 813 or symbol 814, is t₄Then determining whether resources on the MT are available depends on t₂-t₄And T_TRThe relationship (2) of (c). When t is₂-t₄≥T_TR(or t)₂-t₄＞T_TR) When it is, the end time on MT is t₄Is available; when t is₂-t₄＜T_TR(or t)₂-t₄≤T_TR) When it is, the end time on MT is t₄Is not available.

Here, t is₃-t₁And t₂-t₄All can be formed by_UUThus obtaining the product.

As can be seen from the above embodiments in fig. 5 to fig. 8, in different scenarios, when a certain relationship is satisfied between resources on the IAB node MT and hard resources of the DU, availability of MT resources of the IAB node can be determined.

For convenience of description, the embodiments of the present application define a first set of resources, where the first set of resources is between a first set of hard resources and a second set of hard resources, and the first set of hard resources and the second set of hard resources are consecutive hard resources. A contiguous hard resource means that there are no other hard resources between the first set of hard resources and the second set of hard resources. It should be understood that the resources herein may be symbols, slots, or subframes, which are not described in detail below. The following description will be given mainly by taking symbols as examples. The first set of resources may be some or all of the resources between the first set of hard resources and the second set of hard resources. The first resource set may be uplink transmission or downlink transmission when used for transmission between the MT and the upper node. When the first hard resource set and the second hard resource set are used for transmission between the DU of the IAB node and the subordinate node, uplink transmission or downlink transmission may be performed. Whether the first, first or second set of resources is specifically used for uplink or downlink transmission depends on the scheduling or configuration.

In particular, in general terms, the first node determines a first threshold x and a second threshold y, when t₃-t₁Is not less than x, and t₂-t₄And when the symbol is larger than or equal to y, the first node determines that the first symbol in the first resource set is available. Wherein, t₁Is the end time, t, of the last symbol in the first set of hard resources₂Is the start time, t, of the first symbol in the second set of hard resources₃Is the start time of the first symbol, t₄Is the end time of the first symbol. The first node is an IAB node.

In the present application, the start and end times of a symbol may refer to the start and end times of a transmitted symbol, or may refer to the start and end times of a received symbol. It should be understood that the start and end times of a received symbol may refer to the start and end times of the symbol reception window, and the start time of a received symbol may not include a Cyclic Prefix (CP) of a 0FDM symbol.

The first threshold value x and the second threshold value y have different values in different scenes. In particular, the amount of the solvent to be used,

Wherein, T_RTReceiving the conversion time sent by the DU by the MT of the first node or receiving the conversion time sent by the MT by the DU by the MT of the first node; t is_TRThe MT of the first node sends the transition time to DU reception, or the DU sends the transition time to MT reception.

Through setting the parameters under various scenarios, the resources of the IAB node on the backhaul link can be determined. Fig. 9 is a method for determining resources according to an embodiment of the present application. It should be understood that the steps in fig. 9 do not represent a sequential order of execution, nor do they indicate that all of the steps are required.

In order to realize that the IAB node and the superior node keep the consistency of transmission resources on the backhaul link, the resources determined by the IAB node and the superior node for the backhaul link are the same. In fig. 9, the first node is an IAB node, the second node is a higher node of the IAB node, and the second node may be another IAB node or a donor base station. The method comprises the following specific steps.

S901, the second node acquires a first hard resource set and a second hard resource set of the first node.

The second node may obtain the first and second hard resource sets of the first node through the donor base station. The first and second sets of hard resources are acquired, for example, through RRC signaling or F1-AP interface.

The second node may also directly acquire the first and second hard resource sets through the first node. For example, the second node may obtain the first and second sets of hard resources of the first node by sending a resource configuration request to the first node. Specifically, the first and second hard resource sets may be acquired through Media Access Control (MAC) layer signaling (CE), i.e., MAC CE. And the first node sends a resource configuration response to the second node after receiving the resource configuration request of the second node, wherein the resource configuration response comprises a first hard resource set and a second hard resource set.

In a possible implementation, the second node may further obtain soft resource configuration information of the first node, and obtain the first hard resource set and the second hard resource set through the soft resource configuration information. As can be seen from the foregoing embodiments, the second node can determine available and/or unavailable resources on the MT of the first node according to the hard resources and/or soft resources of the first node.

The first set of hard resources may be one or more symbols, slots, or subframes. The resources in the first set of hard resources have the same transmission direction, i.e. the DUs for the first node are transmitted uplink or downlink on the access link. Likewise, the second set of hard resources may be one or more symbols, slots, or subframes. The resources in the second set of hard resources have the same transmission direction. Thus, the second node acquiring the first and second sets of hard resources of the first node comprises acquiring information of transmission directions of the first and second sets of hard resources.

S902, the second node determines a first resource set.

The first set of resources is located between the first set of hard resources and the second set of hard resources. The first set of resources is part or all of the resources between the first set of hard resources and the second set of hard resources, the first set of resources may be one or more symbols, slots, or subframes, and all of the resources on the first set of resources have the same transmission direction. The first set of resources is used for data transmission between the MT of the first node and the DU of the second node. It should be understood that data transmission in this application includes transmission of user data and control signaling. The following description will be given mainly by taking symbols as examples.

The resources between the first hard resource set and the second hard resource set may be divided into one or more first resource sets, each first resource set may have its own transmission direction, and the specific transmission direction is dynamically allocated by the second node according to the scheduling requirement. Therefore, after determining the first resource set, the second node notifies the first node of the first resource set through the resource indication information. The resource indication information may be indicated through a PDCCH, and specifically, the DCI in the PDCCH carries the resource indication information. Resource indication information for one or more first resource sets may be included in the PDCCH.

S903, the second node sends the resource indication information to the first node.

The resource indication information may be carried through higher layer signaling or layer one signaling, for example, through DCI for resource indication. Specifically, the resource indication information includes one or more of the following information: starting position of resources, number of resources, transmission direction, frequency domain information. The frequency domain information may include a starting position of a frequency domain, such as a Resource Block (RB) number, and/or a number of RBs.

S904, the first node determines a first threshold value x and a second threshold value y according to the resource indication information.

The first threshold and the second threshold depend on a transmission direction of the first set of resources and also on a transmission direction of the first set of hard resources and the second set of hard resources. The timing relationship between the resources caused by the different transmission directions of the first hard resource set and the first resource set is as described in fig. 5 to fig. 8 in the foregoing embodiments, and is not repeated herein.

The first threshold x is the minimum limit that the time difference between the start time of the first symbol and the end time of the last symbol in the first set of hard resources satisfies. The second threshold y is the minimum limit that the time difference between the end time of the first symbol and the start time of the first symbol in the second set of hard resources satisfies. The first symbol is a symbol in the first set of resources for which an availability status needs to be determined.

Specifically, when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, the first threshold x ═ T_TR(ii) a Alternatively, the first and second electrodes may be,

Wherein, T_RTTransition time, T, for the reception of a transmission by a first node_TRIs the transmit to receive transition time of the first node.

In one possible implementation, the first node may determine the first threshold value x and the second threshold value y by a table lookup. Specifically, the first threshold value x and the second threshold value y may be determined by the following table 3.

Table 3 resource transmission direction and threshold value corresponding relation

In table 3, DU denotes the hard resource of the first node DU, and MT denotes the first resource of the first node MT. For DU, UL indicates that the transmission direction is uplink reception on the access link, and DL indicates that the transmission direction is downlink transmission on the access link. For MT, UL indicates that the transmission direction is uplink transmission on the backhaul link, and DL indicates that the transmission direction is downlink reception on the backhaul link.

By looking up the table, the first threshold value x and the second threshold value y can be determined.

In a possible implementation, the first threshold value x and the second threshold value y may be defined by a protocol. For example, the first threshold value x and the second threshold value y may be defined as the same predefined value, or may be defined as different predefined values. Predefined thresholds may be defined for the first threshold x and the second threshold y in the various scenarios in table 3 above, respectively. For example, in a scenario where DU is uplink and MT is downlink, the first threshold value x and the second threshold value y may not be 0. The specific definition may depend on the protocol definition or other factors such as the vendor device implementation, etc. This application is not limited to a particular implementation.

In one possible implementation, the first threshold value x and the second threshold value y are reported by the first node to the second node.

S905, the first node determines the available state of the first symbol.

Let t be₁Is the end time, t, of the last symbol in the first set of hard resources₂Is the start time, t, of the first symbol in the second set of hard resources₃Is the start time of the first symbol, t₄Is the end time of the first symbol. When t is₃-t₁Is not less than x, and t₂-t₄And when the symbol is larger than or equal to y, the first node determines that the first symbol in the first resource set is available.

Here, the start and end times of a symbol may refer to the start and end times of a transmission symbol, or may refer to the start and end times of a reception symbol. It should be understood that the start and end times of a received symbol may refer to the start and end times of the symbol reception window, and the start time of a received symbol may not include a Cyclic Prefix (CP) of a 0FDM symbol.

Since the first set of resources may include a plurality of symbols, generally, finding the first and last available symbol in the first set of resources may determine the set of available symbols in the first set of resources. The first symbol is a symbol in the first resource set whose availability needs to be determined, and the first node may determine its availability status by using the above method for each symbol in the first resource set. The available state includes available and unavailable. A symbol with a state of available indicates that it is available for data transmission between the first node and the second node, and a symbol with a state of unavailable indicates that it is not available for data transmission between the first node and the second node.

When the first set of resources includes all resources between the first set of hard resources and the second set of hard resources, it can be seen from the embodiments described in fig. 5 to 8 that one or more symbols located after the first set of hard resources in the time domain in the first set of resources and one or more symbols located before the second set of resources in the time domain in the first set of resources need to be considered.

If the first set of resources includes a portion of resources between the first set of hard resources and the second set of hard resources and the resources are located after the first set of hard resources, then generally only one or more symbols in the first set of resources located after the first set of hard resources need be considered.

If the first set of resources includes a portion of resources between the first set of hard resources and the second set of hard resources and the resources precede the second set of hard resources, then generally only one or more symbols in the first set of resources that precede the second set of resources need be considered.

The specific method for determining the available state of the first symbol refers to the embodiments shown in fig. 10 and fig. 11.

In one possible implementation, the last symbol of the first set of hard resources or the first symbol of the second set of hard resources is a flexible symbol, i.e., a symbol for which the transmission direction has not been determined. In one possible implementation, the first node may assume the flexible symbol as an uplink symbol or a downlink symbol, respectively, and determine the availability of the first symbol according to both assumptions, and determine the first symbol as an available symbol if and only if the first symbol is available under both assumptions. In another possible implementation, the protocol specifies a first or second node's assumption of the flexible symbol, e.g., always assuming the flexible symbol as uplink or downlink, and the first node determines the availability of the first symbol based on this assumption.

S906, the second node acquires a first threshold value x and a second threshold value y.

Since the first threshold x and the second threshold y may be related to the power amplifier transceiving switching time between the DU and the MT of the first node, the second node needs to obtain the power amplifier transceiving switching time between the DU and the MT of the first node, so as to determine the first threshold x and the second threshold y. The power amplifier transceiving switching time between the DU and the MT of the first node includes a switching time from receiving to transmitting or a switching time from transmitting to receiving, which is not described in detail herein.

In one possible implementation, the second node may obtain the power amplifier transceiving switching time between the DU and the MT of the first node from the donor base station, for example, by using the RRC protocol or the F1-AP interface message.

In one possible implementation, the second node may request the first node to transmit the power amplifier transceiving switching time between the DU and the MT of the first node directly through the MAC CE.

In one possible implementation, the first threshold x and the second threshold y may be protocol defined. As described above, the details are not repeated.

S907, the second node determines the available state of the first symbol.

Step S907 is synchronous to step S905, and the specific method for determining the available state of the first symbol refers to the embodiments shown in fig. 10 and fig. 11.

Fig. 10 is an illustration of a state of availability of one or more symbols in a first set of resources subsequent to a determination of the first set of hard resources. The available state of one or more symbols after the first set of hard resources is determined mainly includes two scenarios, that is, the scenario in which the first set of resources is uplink transmission and the scenario in which the first set of resources is downlink transmission. Fig. 10(a) shows a scenario in which the first resource set is downlink transmission, and fig. 10(b) shows a scenario in which the first resource set is uplink transmission.

In fig. 10(a), 1010 is a downlink transmission resource of an IAB node DU, 1001 is an uplink transmission resource of the DU, and the transmission resource may be a symbol, a slot, or a subframe. The boundary of the uplink time slot has a certain lead relative to the boundary of the downlink time slot. Reference numeral 1003 denotes an end time of the DU uplink transmission resource, and 1004 denotes an end time of the DU downlink transmission resource. Fig. 10(a) shows two

resources

1020 and 1021 of the IAB node MT, which are numbered 0 and 1, respectively, with resource 0 starting at 1025 and resource 1 starting at 1026. 1025 and 1026 are possible receive times for resource 0 and resource 1, respectively. 1003 and 1004 are the actual end times of 1001 and 1001, respectively. Since 1001 and 1010 are hard resources, their end times are determined.

Therefore, in fig. 10(a), in order to determine whether the

resources

0, 1 of the MT are available, the time difference between the resource 0 and the

resources

1 and 1003 or 1004 is to be considered. As can be seen from the foregoing embodiments, when 1001 of the IAB node DU is uplink received, there is no need to perform transmit-receive conversion of the power amplifier, and there is a certain delay in the reception of the IAB node on the MT due to propagation delay. The time difference between 1025 and 1003 is therefore greater than 0 and the first symbol in the first set of resources is always available.

When 1010 of the IAB node DU is downlink transmission, the power amplifier needs to be switched from transmission of the access link of the IAB node to the receiving state of the backhaul link at this time, and a certain switching delay is required, which is not described in detail as described above. At this point, the time difference between 1025 and 1004 needs to be calculated to determine the available state of the first symbol. Resource 1 to IAB node MT is similar.

In fig. 10(a), since the first set of resources is downlink transmission, the location of resource 0 of the IAB node MT can be determined from the downlink slot or frame timing of the IAB node DU. Since the end of the 1010 resource of the IAB node DU is at 1004, the time difference between 1025 and 1004 can be theoretically determined by the propagation delay to determine the arrival time of IAB node resource 0. However, in practice, the time difference between 1025 and 1004 is not necessarily exactly equal to the propagation delay between the first node and the second node due to timing imperfections.

Typically, the time difference between 1025 and 1004 is represented by Δ_DDAnd (4) determining. When the downlink sending timing of the IAB node DU is configured by the upper node through the 0TA (over the air) method, it is assumed that the timing advance configured by the upper node for the IAB node is TA, and the timing offset is T_deltaThen, Δ can be obtained_DD＝TA/2+T_delta. TA is the timing advance used by the IAB node MT for uplink transmission, and is generally configured by the upper node, and has the same meaning as the timing advance used for uplink transmission by the UE.

For example, to determine whether the symbol 1020 is available, it is determined by the time difference between the start time 1025 of the symbol 1020 and the end time 1004 of the symbol 1010. Assume 1020 a start time t₃The ending time of the symbol 1010 is t₁By judging t₃-t₁And a first threshold x to determine the availability status of the first symbol in the first set of resources on the IAB node MT. When (t)₃-t₁) Is not less than x (or (t)₃-t₁) > x), then resource 1020 is determined to be available. If (t)₃-t₁) < x (or (t)₃-t₁) X) then resource 1020 is determined to be unavailable. In an example, for a first symbol in a first set of resources, (t)₃-t₁)＝Δ_DD。

Similarly, for resource 1021, start time 2016 is offset from start time 1025 of resource 1020 by an offset, T, of 1026 from start time 1025, for example, of the symbol_sWherein T is_sIs the length of one symbol, T_sThe size depends on the waveform parameters, and T is determined by different waveform parameters_sThe sizes are different. Specific T_sThe size depends onAnd (4) protocol definition. It should be understood that if the resource is a time slot, the offset of 1026 with respect to 1025 is the size of one time slot, and the size of the time slot also depends on the waveform parameters, which can be determined according to the waveform parameters defined in the protocol, and is not described herein again.

Therefore, the time difference between 1026 and 1004 in FIG. 10(a) is T_s+Δ_DDWhen T is_s+Δ_DDNot less than x (or T)_s+Δ_DD> x), then resource 1021 is determined to be available. If T is_s+Δ_DD< x (or T)_s+Δ_DDX) or less, then resource 1021 is judged to be unavailable.

More generally, assume that the symbols in the first set of resources in fig. 10(a) are numbered 0, 1, …, k-1 in order, where k is an integer greater than 1. Then the time difference between the start time of the ith symbol and 1004 is i x T_s+Δ_DDWhen i is T_s+Δ_DD≧ x (or i T)_s+Δ_DD> x), then the ith symbol in the first set of resources is determined to be available. If i T_s+ΔD_D< x (or i T)_s+Δ_DDX) or less, judging that the ith symbol in the first resource set is unavailable.

In fig. 10(b), 1002 and 1011 are hard resources of an IAB node DU, where 1002 is an uplink resource and 1011 is a downlink resource, and 1002 is an uplink reception resource, and has a certain timing advance with respect to the downlink transmission resource 1011, and is denoted as T_gI.e. T_gIs the timing offset between the uplink frame and the downlink frame of the IAB node DU. 1005 and 1006 are end times of uplink resource 1002 and downlink resource 1011, respectively.

Resources

1022, 1023, and 1024 are possible transmission times in the first set of resources, e.g., start time 1027 if resource 1022 is transmitted, start time 1028 if resource 1023 is transmitted, etc.

Since the first resource set is uplink transmission, a certain advance is needed with respect to the uplink timeslot or subframe timing when actual transmission is performed.

If the hard resource of the IAB node DU before the first resource set is sent in the downlink, the IAB node does not need to carry out power amplifier conversion from the hard resource of the UD to the uplink transmission of the MT. Thus, a symbol in the first set of resources may be used for MT transmission if its start time is later than the end time 1006 of the hard resource 1011 of the DU.

In fig. 10(b), the advance Δ of the MT uplink transmission frame relative to the downlink transmission frame of the DU_UD＝TA+TA_offset-Δ_DD. Assume that the symbols in the first set of resources in fig. 10(b) are numbered sequentially as 0, 1. Then the time difference between the start time of the ith symbol and 1006 is i x T_s-Δ_UDWhen i is T_s-Δ_UD0 (or i) T of_s-Δ_UD> 0), then the ith symbol in the first set of resources is determined to be available. If i T_s-Δ_UD< 0 (or i T)_s-Δ_UDLess than or equal to 0), the ith symbol in the first resource set is judged to be unavailable.

If the IAB node DU in fig. 10(b) is uplink transmission, a certain power amplifier switching time T is required for switching from uplink reception of the DU to uplink transmission of the MT_RT. At this time, the time difference Δ between the uplink reception frame of the IAB node DU and the uplink transmission frame of the MT_UU＝TA+ TA_offset-Δ_DD-T_g. Similarly, the time difference between the starting time of the ith symbol in the first resource set and 1005 may be obtained as i × T_s-Δ_UUWhen i is T_s-Δ_UU≥T_RT(or i T_s-Δ_UU＞T_RT) Then, the ith symbol in the first resource set is determined to be available. If i T_s-Δ_UU＜T_RT(or i T_s-Δ_UU≤T_RT) And if so, judging that the ith symbol in the first resource set is unavailable.

Fig. 11 is a diagram illustrating determination of one or more symbol availability statuses in a first set of resources prior to a second set of hard resources. The determination of the availability status of one or more symbols before the second set of hard resources mainly includes two scenarios, i.e., a scenario in which the first set of resources is uplink transmission and a scenario in which the first set of resources is downlink transmission. Fig. 11(a) shows a scenario in which the first resource set is downlink transmission, and fig. 11(b) shows a scenario in which the first resource set is uplink transmission.

FIG. 11(a) In 1110 is a downlink transmission resource of an IAB node DU, 1101 is an uplink transmission resource of the DU, and the transmission resource may be a symbol, a slot, or a subframe. The general uplink time slot boundary has a certain lead relative to the downlink time slot boundary and is marked as T_g. 1103 is the start time of the uplink transmission resource of the DU, and 1004 is the start time of the downlink transmission resource of the DU. Fig. 11(a) shows two

resources

1120 and 1121 of an IAB node MT, which are numbered k-2 and k-1, respectively, with resource k-2 ending at 1124 and resource k-1 ending at 1125. 1124 and 1125 are the end times of resource k-2 and resource k-1, respectively, if

resources

1120 and 1121 were used for transmission. Since 1101 and 1110 are hard resources, their start times are determined.

Thus, in FIG. 11(a), to determine whether resources k-2, k-1 of the MT are available, the time difference between the start times of resources k-2 and hard resources of the IAB node DU is looked at. Similarly, to determine whether resource k-1 of the MT is available, see the time difference between resource k-1 and the start time of the hard resource of the IAB node DU.

As can be seen from the foregoing embodiments, when 1101 of the IAB node DU is uplink reception, at this time, there is no need to perform the transmit-receive conversion of the power amplifier, so that the end time of a certain symbol on the IAB node MT is between the start times of 1101, and the symbol is available.

When the IAB node DU 1110 is downlink transmission, the power amplifier needs to switch from reception of the return link of the IAB node to transmission of the access link, and there is a certain conversion delay T_RT. At this point, the time difference between 1104 and the end time of the first symbol of the IAB node MT needs to be calculated in order to determine the availability of the first symbol.

In FIG. 11(a), since the first set of resources is downlink transmission, there is a Δ for each MT resource, e.g., resource k-1, with respect to frame timing_DDDelay of Δ_DDThe definitions of (A) and (B) are as described above and will not be described in detail. Let t be the time difference between the start time of resource 1110 of the IAB node DU and the end time of the ith symbol of the MT_DDThen can pass t_DDAnd a second threshold y to determine the availability of the ith symbol in the first set of resources on the IAB node MTState.

From FIG. 11(a), t can be determined_DD＝(k-i-1)*T_s-Δ_DDWhen t is_DDNot less than y (or t)_DDY), then judging that the resource i is available. If t is_DD< y (or t)_DDY) or less, judging that the resource i is unavailable. When the first resource set is downlink transmission on the IAB node MT and the hard resource set is downlink transmission on the DU, y is T_RT. The definitions of the parameters are as described above and are not described in detail.

In fig. 11(a), if the IAB node DU is uplink transmitted, the availability status of the ith symbol in the first resource set at the IAB node MT can be determined similarly. Let t be the time difference between the start time of resource 1101 of IAB node DU and the end time of the ith symbol of MT_DUFrom FIG. 11(a) and the foregoing examples, t can be obtained_DU＝(k-i-1)*T_s-Δ_DD-T_gWhen t is_DUNot less than y (or t)_DUY), then judging that the resource i is available. If t is_DU< y (or t)_DUY) or less, judging that the resource i is unavailable. When the first resource set is downlink transmission in the IAB node MT and the hard resource set is uplink transmission in the DU, y is 0. The definitions of the parameters are as described above and are not described in detail.

In fig. 11(b),

resources

1102 and 1111 are hard resources of an IAB node DU, where 1102 is an uplink reception resource, 1111 is a downlink transmission resource, the start time of resource 1102 is 1105, and the start time of 1111 is 1106. Similarly, boundary 1105 of 1102 is advanced by a time T relative to boundary 1106 of 1111_g. The first set of resources for the IAB node MT is uplink transmission, and the last two resources (e.g., symbols) 1122 and 1123 in the first set of resources are shown in fig. 11 (b). 1122 and 1123 are finished at 1126 and 1127, respectively.

When the hard resource of the IAB node DU in fig. 11(b) is downlink transmission, since the first resource set of the MT is uplink transmission, both the MT and the DU are in a transmission state, and therefore, no transition time is required for the transmission of the power amplifier from the MT to the DU. Therefore, it is only necessary to satisfy that the time difference between 1106 and 1127 is greater than 0 (or equal to or greater than 0). Since the resources in the first set of resources are all before the hard resources 1111 of the DU,the uplink frame of the MT has a certain advance relative to the downlink transmission frame of the DU, and as can be seen from the foregoing embodiment, this advance is Δ_UD＝TA+TA_offset-Δ_DD。

When the hard resource of the IAB node DU in fig. 11(b) is uplink reception, the IAB node MT switches from uplink transmission to uplink reception of the DU, and the power amplifier switches from transmission to reception, where the switching time is T_TR. Similarly, the availability status of the ith symbol in the first set of resources on the IAB node MT may be determined. Let t be the time difference between the start time of resource 1102 of IAB node DU and the end time of the ith symbol of MT_UUFrom FIG. 11(b) and the foregoing embodiments, t can be obtained_UU＝(k-i-1)*T_s-Δ_UD-T_gWhen t is_UUNot less than y (or t)_UUY), then judging that the resource i is available. If t is_UU< y (or t)_UUY) or less, judging that the resource i is unavailable. Wherein, y is T_TR. The definitions of the parameters are as described above and are not described in detail.

It should be understood that the embodiments described above with respect to fig. 10 and 11 are the same for the first node and the second node, and that the availability status of the symbols in the first set of resources needs to be determined. In order to enable the second node to calculate the available state of the symbols (or resources) in the first resource set, the second node needs to obtain the power amplifier transition time between the IAB node DU and the MT, which is not described in detail herein. The second node also needs to obtain the conversion time T from uplink receiving to downlink sending of the IAB node DU_gOr is or

Specifically, a first node reports a delta to a second node_UUOr is or

Or T_g. The second node receives the parameter T reported by the first node_gThen, Δ is determined by the following formula_UU：

Δ_UU＝TA+TA_offset-Δ_DD-T_g

In one possible implementation, the first node may switch from the first superior node to the second superior node for some reason, such as a beam failure, when the first node sends the T to the second superior node _delta1 or said Δ_DDWherein T is_delta1＝Δ_DD-TA/2. Before the first node finishes reporting, the second superior node assumes delta_DD＝TA/2。

In one possible implementation, the timing of the first node is not configured by the second node by an OTA method, e.g., the timing of the first node may be obtained by GPS, at which time the first node sends the T to the second superordinate node _delta1 or said Δ_DDWherein T is_delta1＝Δ_DD-TA/2. Before the first node finishes reporting, the second superior node assumes delta_DD＝TA/2。

In one possible implementation, the IAB node receives the T_deltaAnd reported T _delta1 have the same signaling format, including T_deltaT of (a) and (b)_delta1, value range and value granularity.

In one possible implementation, the upper node adjusts TA or T during air interface synchronization_deltaThe downlink sending timing of the first node DU is adjusted, and the superior node can know the time for the first node to complete the downlink sending timing. Thus, the superior node defaults to using the new Δ after the first node has completed timing adjustments_DDThe value is obtained. Correspondingly, the first node receives a TA updating command sent by the superior node, and updates delta according to the TA updating command_UUAnd/or delta_DD。

In one possible implementation, the superior node reports T to the host base station node_deltaAnd/or T _delta1, where T is_deltaIndicating a timing adjustment value that the superordinate node sends or is ready to send to the first node. Optionally, after reporting, the donor base station transmits the updated T to the upper node_deltaValue is taken, and then the upper node updates the updated T_deltaValue sendingTo the first node.

It should be understood that the TA update command may be sent to the first node through RRC or MAC CE, or the host node may send to the first node through RRC or F1-AP interface. Furthermore, if T of the first node_gValue and T of upper node_gWhen the values are the same, the first node may not report T_gValue, at this time Δ_UU＝Δ_DD。

In one possible implementation, the superordinate node updates the downlink transmission timing for the DU of the first node, at which time the DU of the first node needs to adjust the downlink transmission time to the updated value, and at the same time the DU of the first node should also adjust the uplink reception timing, so that T is the uplink reception timing_gAnd remain constant. Optionally, the first node adjusts the downlink transmission timing of the DU without performing during the transmission process of the downlink timeslot. Optionally, the adjustment of the uplink receiving timing of the DU is not performed during the receiving process of the uplink timeslot. Thus, optionally, the above adjustment may be made over the CP range of the first symbol of the slot.

It is to be understood that the above Δ_DD，Δ_UD，Δ_UU，Δ_DUThe calculations of (c) are all examples. After the second node acquires the necessary information, the second node can obtain delta through different implementation methods_DD，Δ_UD，Δ_UU，Δ_DU. The necessary information includes the above TA, T_delta，T _delta1，TA_offset，T_gAt least one of (a).

Consider an uplink timing advance TA from a first node to a second node. In the initial access process, the first node obtains the initial timing advance from the second node, then the second node can update the uplink timing advance of the first node through signaling, and the first node communicates with the second node by adopting the updated uplink timing advance. However, in practice, decoding errors may occur in the first node and/or the second node, resulting in different TA values maintained by the first node and the second node. When the TA values maintained by the first node and the second node are different, T that may cause the second node to configure the first node with errors may be generated_deltaOr causing the second node to be calculating Δ_DD，Δ_UD，Δ_UU，Δ_DUAn error occurs. To avoid this situation, it is necessary to provide a mechanism to solve the problem that the TA values maintained or stored by the first node and the second node are inconsistent.

In one possible implementation, the first node may be configured with the correct T in order to keep the second node available_deltaThe first node reports the TA value it maintains to the second node or the donor node, and marks it as TA1, and this reporting can be triggered by the second node or the donor node. For example, the second node or the donor node sends a TA report request to the first node, and the first node reports the TA value maintained by the first node to the second node or the donor node after receiving the TA report request. Optionally, the first node may report T at the same time _delta1, and T _delta1 is obtained according to TA1, i.e. T _delta1＝Δ_DD-TA1/2。

In one possible implementation, the first node reports TA1/2, and its corresponding T, to the second node or donor node _delta1. Or the first node reports T _delta1 hour, can report its calculation T at the same time _delta1, or TA/2. Or the second node or the donor node triggers the first node to report T _delta1 hour, the first node can be simultaneously required to report the calculation T _delta1, or TA/2.

In another possible implementation, after receiving the MAC CE timing update command sent by the second node, the first node sends a TA acknowledgement message to the second node through the MAC CE, thereby ensuring that the first node and the second node maintain the same TA. Since the first node is required to return the TA acknowledgement message at this time, the second node cannot apply the value of the timing advance in the timing update command until the TA acknowledgement message is received. To ensure that the first node and the second node can use the correct timing advance at the same time, the activation time may be increased in the timing update command. For example, from the perspective of the second node, the activation time may be a value of starting to use a new timing advance m time slots/subframes after the current transmission timing update command time slot/subframe, where m bits are any positive integer. The activation time may also be protocol defined, for example, defining a new timing advance value to start using m slots/subframes after receiving the timing update command. The specific implementations are not limiting of the present application.

Since the TA acknowledgement message may also be lost, to ensure consistency, the second node may further send a TA update complete message to the first node. If the TA update complete message is supported, the activation time should be after the TA update complete message.

Through the embodiment, the upper node can be ensured to configure the correct timing offset T for the IAB node_deltaAnd ensuring the calculated delta of the second node_DD，Δ_UD，Δ_UU，Δ_DUAnd the calculation result is consistent with the calculation result of the first node so as to determine the correct symbol available state and avoid data transmission errors caused by symbol inconsistency.

It should be noted that the above embodiments have given the second node according to Δ_DD，Δ_UD，Δ_UU，Δ_DUSome examples of the time deviation of the MT symbol from the DU symbol are obtained, in practice, according to Delta_DD，Δ_UD，Δ_UU，Δ_DUAnd parameter information of MT and DU resources of the IAB node, the time offset of any MT symbol and DU symbol can be obtained, and a specific acquisition or calculation method can be defined by a protocol and can also be reserved for implementation of the second node.

The embodiment can determine the available state of the symbols in the first resource set, thereby utilizing the symbols to the maximum extent and improving the spectrum efficiency. It should be appreciated that the above determination of the availability status of symbols in the first set of resources need not be made for each symbol, and that generally one or more symbols in the first set of resources may be considered, either preceding or ending. For example, only the 0 th to 3 rd symbols in the first set of resources are considered, the following symbols may be the k-1 th, k-2 th or k-3 th symbols, etc., and after the first and last available symbols are determined, the symbol states in between the first and last available symbols are both available.

The foregoing embodiments are directed to determining the state of available symbols in a first set of resources after a first hard resource of an IAB node DU and/or before a second hard resource. And the first set of resources may be only a portion of the resources between the first hard resource and the second hard resource. For convenience of description, the present application refers to resources interposed between the first hard resource and the second hard resource as MT available resources. And the MT available resources may include a plurality of first resource sets. Each first set of resources may be scheduled for uplink transmission, or for downlink transmission. If the transmission states of two consecutive first resource sets are different, i.e. one first resource set is uplink transmission and the other first resource set is downlink transmission, then the transceiving conversion of the power amplifier also needs to be performed between the two first resource sets.

Fig. 12 is a diagram illustrating that transmission states of two consecutive first resource sets on the IAB node MT are different. In fig. 12(a), the IAB node MT is from send to receive. Fig. 12(b) shows the IAB node MT transmitting from reception.

In fig. 12(a), 1201 is an IAB node DU downlink transmission resource, and 1202 is an IAB node DU uplink reception resource. 1203 is the timing of the downlink transmission slot of the IAB node DU, and 1204 is the timing of the uplink reception of the IAB node DU. 1205 the resource (or set of resources) for the IAB node MT, 1206 sends the resource (or set of resources) for the IAB node MT. Fig. 12(a) shows transition from uplink transmission to downlink reception by the IAB node MT.

As can be seen from the foregoing embodiments, the time difference between the resource start time 1205 and the resource end time 1206

Wherein

The superscript of (2) indicates MT, the subscript indicates uplink transmission to downlink reception, and the meanings of the other parameters are as described above and will not be described again.

Therefore, when

(or

) Then resources 1206 are available. It should be understood that the transmit-to-receive transition time of the power amplifier of the IAB node on the MT and the transition time on the DU are assumed to be equal here. If different, T_TRShould be the transmit to receive transition time of the power amplifier on the MT.

When the MT performs data transceiving, it is usually necessary to ensure that the first symbol of the downlink transmission is available, since the downlink reception usually carries control information. The embodiment shown in fig. 12 assumes that the preceding symbols received downstream are guaranteed to be available. If it is not

(or

) Then the number i of symbols to be dropped on the resource 1206 is satisfied

(or

)。

Fig. 12(b) shows the IAB node MT first receiving downlink on resource 1215 and then transmitting uplink on another resource 1216. 1211 is an IAB node DU downlink transmission resource, and 1212 is an IAB node DU uplink reception resource. Reference numeral 1213 denotes the timing of the downlink transmission slot of the IAB node DU, and 1214 denotes the timing of the uplink reception of the IAB node DU.

Similarly, the time difference between the start time of uplink transmission and the end of downlink reception for the MT of the IAB node

Wherein

The subscript indicates the reception of the uplink transmission from the downlink, and the meanings of other parametersAs mentioned above, no further description is given.

As can be seen from FIG. 12(b), the overlap time between the last resource of 1215 and the first resource of 1216 is

To ensure that the power amplifier transition requirement is met between the two resource sets, one or more symbols at the end of resource set 1215 or one or more symbols at the beginning of resource set 1216 need to be dropped. Or one or more symbols at the end of 1215 or at the beginning of 1216, respectively, to ensure time between two resource sets to meet the power amplifier transition.

Specifically, the number of symbols to be dropped i is satisfied

(or

). Thus, the total number of symbols dropped on resource set 1215 and/or resource set 1216 is satisfied. The particular symbols that are dropped 1215 to the end of the resource set, or 1216 to the beginning, or the partial symbols dropped 1215 and 1216, respectively, may depend on the configuration. For example, the indication may be performed in DCI of PDCCH, and the specific indication may include a number of symbols to be turned off, and may further include an indication to turn off only a tail of downlink reception or a header of uplink transmission, for example, one bit is used to indicate that 1 indicates that only a tail of downlink reception is turned off, and 0 indicates that only a header of uplink transmission is turned off.

If the transmission directions of two consecutive first resource sets in the MT available resources are the same, there is no power amplifier transition time, and therefore, no symbol needs to be dropped between the two resource sets.

In one possible implementation, the last symbol of the first set of hard resources or the first symbol of the second set of hard resources is a flexible symbol, i.e., a symbol for which the transmission direction has not been determined. In one possible implementation, the second node may assume the flexible symbol as an uplink symbol or a downlink symbol, respectively, and determine the availability of the first symbol according to both assumptions, and the first symbol is determined as an available symbol if and only if the first symbol is available under both assumptions. In another possible implementation, the protocol specifies a second node's assumption of the flexible symbol, e.g., always assuming the flexible symbol as uplink or downlink, and the second node determines the availability of the first symbol based on this assumption. By the above embodiments, it is possible to control that the transmission directions between two consecutive first resource sets on the MT available resource are different, and determine the number of dropped symbols. Through the control of the symbol level, the resource waste is reduced, the spectrum efficiency is improved, the consistency of receiving or sending is kept between the sender and the receiver, and the transmission error is avoided.

The foregoing embodiments determine availability of symbols for a first set of resources primarily from knowledge of the configuration of the first set of hard resources and/or a second set of hard resources. While in some cases the opposite may be true, the configuration of the first set of hard resources and/or the second set of hard resources is an implicit configuration. The implicit configuration refers to signaling to specify available resources between a first set of hard resources and a second set of hard resources, which in turn infers the location of the end symbol of the first set of hard resources or the location of the start symbol of the second set of hard resources.

Specifically, the IAB node receives MT available resource configuration information sent by the upper node or the host node. The IAB node determines the position of the last available symbol in the first hard resource set under the various scenes according to the MT available resource configuration information; or the IAB node determines the position of the first available symbol in the second hard resource set under the various scenes according to the MT available resource configuration information.

Specifically, the last symbol in the first hard resource set and/or the first symbol in the second hard resource set may be determined according to a transmission direction of the first resource among the MT available resources and a transmission direction of the first hard resource set or the second hard resource set. Taking the first set of resources as downlink reception and the first set of hard resources as downlink transmission, the start time t of the first available symbol of the first set of resources₃And an end time t of any one symbol of the first hard resource set₁The time difference therebetween satisfies t₃-t₁≥T_TR(or t)₃-t₁＞T_TR) And the last symbol of the first set of hard resources has a maximum symbol end time t1 that satisfies the above condition. The meanings of other parameters are as described above and are not repeated.

Similarly, the location of the first symbol in the second set of hard resources may be determined.

It should be understood that the implicit derivation described above requires the superordinate node or donor node to acquire a delta_DD，Δ_UD，Δ_UU，Δ_DUInformation of (a), obtaining_DD，Δ_UD，Δ_UU，Δ_DUThe method is similar to step S907 and is not described herein again.

Assuming that j symbols are not available or soft symbols (soft symbols) after the last symbol in the first set of hard resources, then the soft symbols can be selected according to j × T_s+Δ_DDNot less than x (or j T)_s+Δ_DD> x) to determine the value of j. The meanings of other parameters are as described above and are not repeated. The boundary of the first set of hard resources can be determined by determining the parameter j.

Similarly, determining that the second set of hard resources is preceded by j symbols are not available or soft symbols, based on j x T_s-Δ_DDNot less than x (or j T)_s-Δ_DD> x) to determine the value of j. The boundary of the second set of hard resources can be determined by the parameter j.

Similarly, when the first set of hard resources is uplink reception and the first set of resources is downlink reception, the symbols on the first set of hard resources are all available, since no translation is required by the power amplifier of the IAB node. At this point, symbols between the first set of resources and the first set of hard resources are available, and thus, the first hard resource set symbol boundary is a symbol before the first symbol of the first resource set.

And when the second hard resource set is received in uplink and the first resource set is received in downlink, according to j x T_s-Δ_DUNot less than y (or j T)_s-Δ_DUY) to determine the value of the number j of unavailable symbols or soft symbols before the second set of hard resources. The boundary of the second set of hard resources can be determined by the parameter j.

When the first hard resource set is sent in downlink and the first resource set is transmitted in uplink, according to j x T_s-Δ_UDNot less than x (or j T)_s-Δ_UD> x) to determine the value of the number j of unavailable symbols or soft symbols after the first set of hard resources. The boundary of the first set of hard resources can be determined by determining the parameter j.

When the second hard resource set is sent in downlink and the first resource set is transmitted in uplink, no power amplifier conversion is needed, so that the symbols on the second hard resource set are all available. Thus, the boundary of the first symbol of the second set of hard resources is the symbol following the first set of resources.

When the first hard resource set is received in uplink and the first resource set is transmitted in uplink, according to j T_s-Δ_UU+T_gNot less than x (or j T)_s-Δ_UD+T_g> x) to determine the value of the number j of unavailable symbols or soft symbols after the first set of hard resources. The boundary of the first set of hard resources can be determined by determining the parameter j.

When the second hard resource set is received in uplink and the first resource set is transmitted in uplink, according to j T_s-Δ_UU+T_gNot less than y (or j T)_s-Δ_UD+T_gY) to determine the value of the number j of unavailable symbols or soft symbols before the second set of hard resources. The boundary of the second set of hard resources can be determined by the parameter j.

Through the above embodiments, when the first resource set is configured in an implicit manner, the number of unavailable symbols on the first hard resource set and/or the second hard resource set may be determined.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. It will be appreciated that the respective network elements, e.g. the first node and the second node, for performing the above-described functions, comprise corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art would readily appreciate that the present application is capable of being implemented as hardware or a combination of hardware and computer software for performing the exemplary network elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, functional modules may be divided into the first node and the second node according to the above method examples, for example, the first node and the second node may be divided into the functional modules, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. It should be understood that the second node may be an IAB node or a donor base station.

Fig. 13 is a schematic diagram of a possible structure of the first node involved in the above-described embodiment provided in the present application. In this application, the first node is an IAB node. The first node includes: a transceiving unit 1301 and a processing unit 1302. A transceiving unit 1301, configured to support the first node to perform S903 and S908 in fig. 9, and to support the first node in the foregoing embodiment to send T to the second upper node when the first node is switched from the first upper node to the second upper node _delta1 or Delta_DD(ii) a The processing unit 1302 is configured to support the first node to execute S904 and S905 in fig. 9, and to support the first node to process the received message or signaling in the foregoing embodiment.

The first node further comprises: a switching unit 1303, configured to support the first node to switch from the first upper node to the second upper node.

In a hardware implementation, the transceiver 1101 may be a transceiver, and the transceiver forms a communication interface of the first node. It should be understood that the communication interface may be a software or hardware interface.

Fig. 14 is a schematic diagram of a possible logical structure of the first node involved in the foregoing embodiments provided in the embodiments of the present application. The first node includes: a processor 1402. In the embodiment of the present application, the processor 1402 is configured to control and manage the action of the first node, for example, the processor 1402 is configured to support the first node to perform S904 and S905 in fig. 9 in the foregoing embodiment, and to support the first node in the foregoing embodiment to process the received message or signaling. Optionally, the first node may further include: a memory 1401 and a communication interface 1403; the processor 1402, the communication interface 1403, and the memory 1401 may be connected to each other or to each other through a bus 1404. Wherein the communication interface 1403 is used for supporting the communication of the first node and the memory 1201 is used for storing program codes and data of the first node. The processor 1202 calls the code stored in the memory 1201 to perform control management, and implements various possible methods in the foregoing embodiments. The memory 1401 may or may not be coupled to the processor.

The processor 1402 and the memory 1401 may be integrated in an asic, and the asic may further include a communication interface 1403. The application specific integrated circuit may be a processing chip or a processing circuit. The communication interface 1403 may be a communication interface including wireless transmission and reception, an interface for processing a received wireless signal by another processing circuit and inputting a digital signal, and a software or hardware interface for communicating with another module.

In one possible design, the processor 1402, the memory 1401, and the communication interface 1403 may be implemented by chips, and the processor 1402, the memory 1401, and the communication interface 1403 may be implemented in the same chip, or may be implemented in different chips, or any two of the functions may be combined and implemented in one chip.

Processor 1402 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a digital signal processor and a microprocessor, or the like. The bus 1404 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (ElSA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc.

The processor 1402, the communication interface 1403 and the memory 1401 described above may also be integrated in one integrated circuit, performing the actions or functions performed by all first nodes in the previous embodiments.

Fig. 15 is a schematic diagram of a possible structure of the second node according to the above embodiment of the present application. In this application, the second node is a relay node or a donor base station. The second node includes: a transceiving unit 1501 and a processing unit 1502. The transceiving unit 1501 is configured to support the second node to perform S903 and S908 in fig. 9, and to support the second node to perform receiving T when the first node switches to the second node in the foregoing embodiments _delta1 or Delta_DD. The second node further comprises: a processing unit 1502, is configured to support the second node to perform S901, S902, S906, and S907 in fig. 9, or to perform processing on the received message.

In terms of hardware implementation, the transceiver 1501 may be a transceiver, and the transceiver forms a communication interface in the second node. It should be understood that the communication interface may be a software or hardware interface.

Fig. 16 is a schematic diagram of a possible logical structure of the second node according to the foregoing embodiments provided in this application. The second node includes: a processor 1602. In the embodiment of the present application, the processor 1602 is configured to control and manage the action of the second node, for example, the processor 1602 is configured to support the second node to perform S901, S902, S906, and S907 in fig. 9 in the foregoing embodiment, or to process the received message. Optionally, the second node may further include: a memory 1601 and a communication interface 1603; the processor 1602, communication interface 1603, and memory 1601 may be interconnected or interconnected via a bus 1604. Wherein the communication interface 1603 is used for supporting the second node to communicate, and the memory 1601 is used for storing program codes and data of the second node. The processor 1602 calls the code stored in the memory 1601 for control management. The memory 1601 may or may not be coupled to the processor.

The processor 1602 and the memory 1601 may be integrated in an application specific integrated circuit, and the application specific integrated circuit may further include a communication interface 1603. The application specific integrated circuit may be a processing chip or a processing circuit. The communication interface 1603 may be a communication interface including wireless transmission and reception, an interface for processing a received wireless signal by another processing circuit and inputting a digital signal, or a software or hardware interface for communicating with another module.

In one possible design, the processor 1602, the memory 1601, and the communication interface 1603 may be implemented by chips, and the processor 1602, the memory 1601, and the communication interface 1603 may be implemented in the same chip, or may be implemented in different chips, or any two functions may be combined in one chip.

The processor 1602 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a digital signal processor and a microprocessor, or the like. The bus 1604 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc.

The processor 1602, the communication interface 1603 and the memory 1601 may also be integrated into one integrated circuit to perform the actions or functions performed by all the second nodes in the foregoing embodiments.

In another embodiment of the present application, a readable storage medium is further provided, where the readable storage medium stores computer-executable instructions, and when a device (which may be a single chip, a chip, or the like) or a processor executes the resource determining method in fig. 9, the computer-executable instructions in the storage medium are read. The aforementioned readable storage medium may include: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the computer executable instructions may be read by the at least one processor of the device from a computer readable storage medium, and execution of the computer executable instructions by the at least one processor causes the device to perform the steps of the first node, the second node in the method of resource determination of fig. 9.

In another embodiment of the present application, a communication system is also provided, which includes at least a first node and a second node. Wherein the first node may be the first node provided in fig. 9, and is configured to perform the steps of the first node in the method for determining resources provided in fig. 9; and/or the second node may be the second node provided in fig. 9 and configured to perform the steps performed by the second node in the method of resource determination provided in fig. 9. It will be appreciated that the communication system may comprise a plurality of first nodes and second nodes, or a plurality of first nodes and a second node. Through the resource indication information, the first node and the second node determine the available state of the resource on the return link, and through the symbol-level resource determination, the resource waste is avoided, and the spectrum efficiency is improved.

In the embodiment of the application, the resource states determined between the first node and the second node are kept consistent through resource determination, so that communication is performed according to the determined resources, and the determined resources are symbol-based, so that air interface resources are utilized to the maximum extent, resource waste is reduced, and spectrum efficiency is improved.

Finally, it should be noted that: the above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for resource determination in a relay system, comprising:

a first node receives resource indication information sent by a superior node, wherein the resource indication information is used for indicating the transmission direction of a first resource set, the first resource set is located between a first hard resource set and a second hard resource set, and the first hard resource set and the second hard resource set are continuous hard resources;

the first node determines a first threshold value x and a second threshold value y according to the resource indication information;

when t is₃-t₁Is not less than x, and t₂-t₄When the symbol is more than or equal to y, the first node determines that a first symbol in the first resource set is available;

wherein, t₁Is the end time, t, of the last symbol in the first set of hard resources₂Is the start time, t, of the first symbol in the second set of hard resources₃Is the start time, t, of the first symbol₄Is the end time of the first symbol;

and the first node communicates with the superior node on the first symbol according to the resource indication information.

2. The method of claim 1, wherein the first node determining a first threshold value x and a second threshold value y according to the resource indication information comprises:

when the transmission direction of the last symbol in the first hard resource set is downlink transmissionWhen the transmission direction of the first resource set is downlink transmission, the first threshold x ═ T_TR(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, x ═ T_RT(ii) a Alternatively, the first and second electrodes may be,

when the first symbol transmission direction in the second hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, y ═ T_RT(ii) a Alternatively, the first and second electrodes may be,

The T is_RTFor a transition time of reception and transmission of the first node, T_TRA transmit to receive transition time for the first node.

3. The method of claim 1,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, the t₃-t₁And t₂-t₄By a_DDDetermination of the above

Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, the t₃-t₁And t₂-t₄By a_UDDetermining the said Δ_UD＝TA+TA_offset-Δ_DD(ii) a Alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is downlink transmission, the t₃-t₁And t₂-t₄By a_DUDetermining the said Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, the t₃-t₁And t₂-t₄By a_UUDetermining the said Δ_UU＝TA+TA_offset-Δ_DD-T_g(ii) a Alternatively, the first and second electrodes may be,

the transmission direction of the first symbol in the second hard resource set is downlink transmission, and when the transmission direction of the first resource set is downlink transmission, the t₃-t₁And t₂-t₄By a_DDDetermination of the above

Alternatively, the first and second electrodes may be,

the transmission direction of the first symbol in the second hard resource set is downlink transmission, and when the transmission direction of the first resource set is uplink transmission, the t₃-t₁And t₂-t₄By a_UDDetermining the said Δ_UD＝TA+TA_offset-Δ_DD(ii) a Alternatively, the first and second electrodes may be,

the first symbol transmission direction in the second hard resource set is uplink transmission, and the transmission direction of the first resource setWhen the downlink transmission is performed, the t₃-t₁And t₂-t₄By a_DUDetermining the said Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

the transmission direction of the first symbol in the second hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, the t₃-t₁And t₂-t₄By a_UUDetermining the said Δ_UU＝TA+TA_offset-Δ_DD-T_g；

Said Δ_DDThe time deviation between the downlink frame receiving time of the mobile terminal of the relay node which is integrated access and return and the downlink frame sending time of the distributed unit, delta_UDThe advance of the uplink transmission frame of the mobile terminal relative to the downlink transmission frame of the distributed unit is delta_DUIs the time delay of the downlink receiving frame of the mobile terminal relative to the uplink receiving frame of the distributed unit, the delta_UUThe time deviation of the uplink sending frame of the mobile terminal relative to the uplink receiving frame of the distributed unit is shown, TA is the timing advance, T is the time deviation of the uplink sending frame of the mobile terminal relative to the uplink receiving frame of the distributed unit_deltaFor timing offset, the TA_offsetFor timing advance offset, the T_gA transmit-receive transition time difference for an access link of the first node.

4. The method of claim 3, comprising:

the first node is switched from a first superior node to a second superior node;

the first node sends the T to the second superior node_deltaOr said Δ_DD。

5. The method of claim 3, comprising:

the first node reports the delta to the superior node_UUOr is or

Or said T_g。

6. The method according to any one of claims 3-5, comprising:

the first node receives a TA updating command sent by a superior node, and updates the delta according to the TA updating command_UU。

7. A method for resource determination in a relay system, comprising:

a second node acquires a first hard resource set and a second hard resource set of a first node, wherein the first hard resource set and the second hard resource set are continuous hard resources, and the second node is a superior node of the first node;

the second node determining a first set of resources, the first set of resources being located between a first set of hard resources and a second set of hard resources;

the second node acquires a first threshold value x and a second threshold value y;

a time difference D between a start time of a first symbol and an end time of a last symbol in said first set of hard resources_hGreater than x, and a time difference D between a start time of a first symbol and an end time of the first symbol in the second set of hard resources_eWhen y is greater, the second node determines that the first symbol in the first set of resources is available;

and the second node performs data transmission with the first node on the first symbol.

8. The method of claim 7, wherein the second node obtaining the first threshold value x and the second threshold value y comprises:

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is downlink transmission, x is 0; alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, x ═ T is performed_RT(ii) a Alternatively, the first and second electrodes may be,

a first symbol transmission direction in the second hard resource set is downlink transmission, and when the transmission direction of the first resource set is downlink transmission, y ═ T_RT(ii) a Alternatively, the first and second electrodes may be,

a first symbol transmission direction in the second hard resource set is downlink transmission, and when the transmission direction of the first resource set is uplink transmission, y is 0; alternatively, the first and second electrodes may be,

a first symbol transmission direction in the second hard resource set is uplink transmission, and when the transmission direction of the first resource set is downlink transmission, y is 0; alternatively, the first and second electrodes may be,

the first symbol transmission direction in the second hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, y ═ T_TR；

9. The method of claim 7, comprising:

and the second node sends resource indication information to the first node, wherein the resource indication information is used for indicating the transmission direction of the first resource set.

10. The method according to any one of claims 7-9, comprising:

the second node receives the delta reported by the first node_UUOr is or

Or T_gTA is the timing advance, Δ_UUReturning to the first node a time difference of a link uplink transmission frame with respect to an access link uplink reception frame boundary, said T_gA transmit-receive transition time difference for an access link of the first node.

11. The method according to any one of claims 7 to 9,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, the D_hAnd said D_eBy a_DDDetermination of the above

Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, the method D is implemented_hAnd said D_eBy a_UDDetermining the said Δ_UD＝TA+TA_offset-Δ_DD(ii) a Alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is downlink transmission, the data transmission method D_hAnd said D_exΔ_DUDetermining the said Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, the D_hAnd said D_eBy a_UUDetermining the said Δ_UU＝TA+TA_offset-Δ_DD-T_g(ii) a Alternatively, the first and second electrodes may be,

the first symbol transmission direction in the second hard resource set is downlink transmission, and when the transmission direction of the first resource set is downlink transmission, the D_hAnd said D_eFrom said Δ_DDDetermining; alternatively, the first and second electrodes may be,

the first symbol transmission direction in the second hard resource set is downlink transmission, and when the transmission direction of the first resource set is uplink transmission, the D_hAnd said D_eFrom said Δ_UDDetermining; alternatively, the first and second electrodes may be,

the transmission direction of the first symbol in the second hard resource set is uplink transmission, and when the transmission direction of the first resource set is downlink transmission, the D_hAnd said D_eFrom said Δ_DUDetermining; alternatively, the first and second electrodes may be,

the first symbol transmission direction in the second hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, the D_hAnd said D_eFrom said Δ_UUDetermining;

12. The method according to any one of claims 7-9, comprising:

the second node sends a TA update command to the first node, the TA update command being used by the first node to update the delta_DDSaid Δ_UUSaid Δ_UDOr said Δ_DU。

13. An apparatus for resource determination in a relay system, comprising:

a transceiving unit, configured to support a first node to receive resource indication information sent by a superior node, where the resource indication information is used to indicate a transmission direction of a first resource set, the first resource set is located between a first hard resource set and a second hard resource set, and the first hard resource set and the second hard resource set are continuous hard resources;

the processing unit is used for supporting the first node to determine a first threshold value x and a second threshold value y according to the resource indication information;

when t is₃-t₁Is not less than x, and t₂-t- ≧ y, the processing unit further configured to determine that a first symbol in the first set of resources is available;

the transceiver unit is further configured to support the first node to communicate with the superior node on the first symbol according to the resource indication information.

14. The apparatus according to claim 13, wherein the processing unit is specifically configured to:

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, determining that the first threshold x is T_TR(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, determining that x is 0; alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, determining that x is 0; alternatively, the first and second electrodes may be,

when it is at homeDetermining that x ═ T is determined when a transmission direction of a last symbol in the first hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission_RT(ii) a Alternatively, the first and second electrodes may be,

when the first symbol transmission direction in the second hard resource set is downlink transmission and the transmission direction of the first resource set is downlink transmission, determining that y is T_RT(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of a first symbol in the second hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, determining that y is 0; alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, determining that y is 0; alternatively, the first and second electrodes may be,

when the first symbol transmission direction in the second hard resource set is uplink transmission and the transmission direction of the first resource set is uplink transmission, determining that y is T_TR；

15. The apparatus of claim 13,

Alternatively, the first and second electrodes may be,

when the transmission direction of the last symbol in the first hard resource set is downlink transmission and the transmission direction of the first resource set is uplink transmission, the t₃-t₁And t₂-t₄By a_UDDetermining the said Δ_UD＝TA+TA_offset-Δ_DD(ii) a Or，

Alternatively, the first and second electrodes may be,

when the transmission direction of the first symbol in the second hard resource set is uplink transmission and the transmission direction of the first resource set is downlink transmission, the t₃-t₁And t₂-t₄By a_DUDetermining the said Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

16. The apparatus of claim 15, comprising:

a switching unit for switching from a first upper node to a second upper node;

the transceiver unit is further configured to send the T to the second upper node_deltaOr said Δ_DD。

17. The apparatus of claim 15, comprising:

the receiving and sending unit is used for reporting the delta to the superior node_UUOr is or

Or said T_g。

18. The apparatus according to any one of claims 13-17, comprising:

the transceiver unit is further configured to receive a TA update command sent by a superior node, and the first node updates the Δ according to the TA update command_UU。

19. An apparatus for resource determination in a relay system, comprising:

the processing unit is used for supporting a second node to acquire a first hard resource set and a second hard resource set of a first node, wherein the first hard resource set and the second hard resource set are continuous hard resources, and the second node is a superior node of the first node;

the processing unit is further configured to support the second node to determine a first resource set, where the first resource set is located between a first hard resource set and a second hard resource set;

the processing unit is further configured to support the second node to obtain a first threshold x and a second threshold y;

a time difference D between a start time of a first symbol and an end time of a last symbol in said first set of hard resources_hGreater than x, and a time difference D between a start time of a first symbol and an end time of the first symbol in the second set of hard resources_eWhen y is greater than y, the processing unit is further configured to support the second node to determine that the first symbol in the first resource set is available;

and the transceiving unit is used for supporting the second node to carry out data transmission with the first node on the first symbol.

20. The apparatus according to claim 19, characterized in that the processing unit is specifically configured to,

when the transmission direction of the first resource set is downlink transmission, determining that x is 0; alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, it is determined that x ═ T_RT(ii) a Alternatively, the first and second electrodes may be,

the first symbol transmission direction in the second hard resource set is downlink transmission, and when the transmission direction of the first resource set is downlink transmission, it is determined that y is T_RT(ii) a Alternatively, the first and second electrodes may be,

when the transmission direction of the first resource set is uplink transmission, determining that y is 0; alternatively, the first and second electrodes may be,

when the transmission direction of the first resource set is downlink transmission, determining that y is 0; alternatively, the first and second electrodes may be,

the first symbol transmission direction in the second hard resource set is uplink transmission, and when the transmission direction of the first resource set is uplink transmission, it is determined that y is T_TR；

21. The apparatus of claim 19, comprising:

the transceiver unit is further configured to send resource indication information to the first node, where the resource indication information is used to indicate a transmission direction of the first resource set.

22. The apparatus according to any one of claims 19-21, comprising:

the transceiver unit is further configured to receive a delta reported by the first node_UUOr is or

Or T_gTA is the timing advance, Δ_UUReturning a link uplink transmission frame relative access chain for the first nodeTime difference of uplink received frame boundary, T_gA transmit-receive transition time difference for an access link of the first node.

23. The apparatus of any one of claims 19-21,

Alternatively, the first and second electrodes may be,

the transmission direction of the last symbol in the first hard resource set is uplink transmission, and when the transmission direction of the first resource set is downlink transmission, the data transmission method D_hAnd said D_eBy a_DUDetermining the said Δ_DU＝T_g+Δ_DD(ii) a Alternatively, the first and second electrodes may be,

24. The apparatus according to any one of claims 19-21, comprising:

the transceiver unit is further configured to send a TA update command to the first node, where the TA update command is used for the first node to update the Δ_DDSaid Δ_UUSaid Δ_UDOr said Δ_DU。

25. An apparatus for resource determination in a relay system, the apparatus comprising: a memory, the memory storing code and data therein, the memory coupled with the processor, the processor executing the code in the memory to cause the apparatus to perform the method of resource determination of any of claims 1-6 or to perform the method of resource determination of any of claims 7-12.

26. A computer readable storage medium having stored thereon instructions that, when executed, perform the method of resource determination of any of claims 1-6 or perform the method of resource determination of any of claims 7-12.

27. A system for resource determination in a relay system, the system comprising at least one first node and at least one second node, comprising:

the first node performing the method of resource determination of any of claims 1-6;

the second node performs the method of resource determination according to any of claims 7-12.