A control signaling transmission method, device and storage medium

Abstract

The present application proposes a control signaling transmission method, device and storage medium. A control signaling transmission method includes: a first communication node sends next-hop routing information of uplink data transmission to a second communication node, and the next-hop routing information of the uplink data transmission includes identification information of a third communication node that is the next hop of the second communication node. This enables the first communication node to configure the next-hop routing information of its uplink data transmission for the second communication node in advance, so that the second communication node can accurately transmit the uplink data to the corresponding third communication node that is the next hop, thereby improving the accuracy and reliability of data transmission.

Description

Technical Field

[0001] The present application relates to a wireless communication network, and in particular to a control signaling transmission method, device and storage medium. Background Art

[0002] The fifth generation (5G) of mobile communications technology, currently under research by the 3rd Generation Partnership Project (3GPP), will achieve greater throughput, more user connections, lower latency, higher reliability, and lower power consumption. Currently under discussion within 3GPP, Integrated Access and Backhaul (IAB) technology offers numerous technical advantages. Specifically, IAB utilizes wireless backhaul and relay links, enabling more flexible deployment of dense New Radio (NR) cells without requiring a corresponding increase in the density of the transmission network.

[0003] In current 3GPP discussions, each IAB node consists of a distributed unit (DU) and a mobile terminal (MT). The DU serves the local user equipment (UE) and the MT of the next-hop node, establishing a Radio Link Control (RLC) connection with them. The MT functions like a UE, connecting to the parent node of the previous hop via the NR Uu interface and establishing an RLC connection with it. Therefore, different IAB nodes can leverage the wireless access capabilities of the local MT to connect to the parent node of the previous hop. The parent node can then connect to the parent node of the previous hop, ultimately connecting to the IAB donor. The IAB donor consists of a donor central unit (CU) and multiple donor DUs. Each donor DU is wired to the donor CU. The donor CU and the donor DU, as well as the donor CU and the DUs of each IAB node, are connected via the F1 interface. To improve reliability, an IAB node can connect to multiple parent nodes. In this way, many IAB nodes are connected to each other to form a complex IAB network.

[0004] Currently, there is no feasible solution for the transmission of some control plane messages in the IAB network. Summary of the Invention

[0005] The present application provides a control signaling transmission method, device and storage medium, which can realize the transmission of control signaling.

[0006] The present invention provides a control signaling transmission method, including:

[0007] The first communication node sends next-hop routing information of uplink data transmission to the second communication node; wherein the next-hop routing information of uplink data transmission includes identification information of a third communication node that is the next hop of the second communication node.

[0008] The present invention provides a control signaling transmission method, including:

[0009] The first communication node receives the NRCGI of the second communication node after switching, which is sent by the second communication node; wherein the NR CGI after switching includes: a PLMN identifier, a base station identifier of the first communication node, and a base station cell identifier of the source first communication node before switching;

[0010] When the first communication node determines that the switched NR CGI conflicts with the NR CGI of any communication node that the first communication node has served, a conflict resolution step is performed.

[0011] The present invention provides a control signaling transmission method, including:

[0012] The second communication node sends the NR CGI of the second communication node after switching to the first communication node; wherein the NR CGI after switching includes: PLMN identifier, base station identifier of the first communication node and cell identifier within the base station of the source first communication node before switching.

[0013] An embodiment of the present application provides a control signaling transmission device, including:

[0014] A processor, wherein the processor is configured to implement the control signaling transmission method of any of the above embodiments when executing a computer program.

[0015] An embodiment of the present application provides a storage medium storing a computer program. When the computer program is executed by a processor, any one of the control signaling transmission methods in the embodiment of the present application is implemented.

[0016] With respect to the above embodiments and non-reserved aspects of the present application and their implementation, further description is provided in the accompanying drawings, detailed description and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A This is a diagram of the protocol stack structure for data plane transmission in the IAB communication system;

[0018] Figure 1BA diagram showing the protocol stack structure for control plane transmission in an IAB communication system;

[0019] Figure 2A A schematic diagram of an application scenario of a control signaling transmission method provided by an embodiment;

[0020] Figure 2B A schematic diagram of another application scenario of a control signaling transmission method provided by an embodiment;

[0021] Figure 3 A flow chart of a control signaling transmission method provided by an embodiment;

[0022] Figure 4 A schematic diagram of an application scenario of a control signaling transmission method provided by another embodiment;

[0023] Figure 5 A flow chart of a control signaling transmission method provided by an embodiment;

[0024] Figure 6 A schematic diagram of the structure of the NR CGI provided in one embodiment;

[0025] Figure 7 A flowchart of a control signaling transmission method provided in another embodiment;

[0026] Figure 8 A schematic structural diagram of a control signaling transmission device provided by an embodiment;

[0027] Figure 9 A schematic structural diagram of a control signaling transmission device provided in another embodiment;

[0028] Figure 10 A schematic structural diagram of a control signaling transmission device provided in yet another embodiment;

[0029] Figure 11 A schematic structural diagram of a control signaling transmission device provided in yet another embodiment. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions and advantages of this application more clear, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this application can be combined with each other in any way.

[0031] The control signaling transmission method provided in this embodiment can be applied to a communication system composed of a first communication node, a second communication node, and a third communication node. The communication system can be a Global System for Mobile Communications (GSM), a General Packet Radio Service (GPRS) system, a Code Division Multiple Access (CDMA) system, a CDMA2000 system, a Wideband Code Division Multiple Access (WCDMA) system, a Long Term Evolution (LTE) system, an LTE-A system, or a World Interoperability for Microwave Access (WiMAX) system. Exemplarily, the communication system can be an IAB communication system.

[0032] Figure 1A Figure 1 is a diagram of the protocol stack structure for data plane transmission in the IAB communication system. Figure 1A As shown in the figure, taking downlink data transmission as an example, a data packet travels from the core network user plane function (UPF) via the NG user plane (NG-U) interface to the IAB-Donor on the radio access network (RAN). The CU in the IAB-Donor consists of two parts: the CU control plane (gNB-CU-CP) and the CU user plane (gNB-CU-UP). Downlink data is transmitted from the gNB-CU-UP in the IAB-Donor to the gNB-DU. The gNB-DU forwards the data packet to each IAB node via the backhaul radio link layer control channel (BH RLC channel), ultimately reaching the access IAB node (i.e., IAB node2) that connects to the UE over the air interface. The access IAB node sends the data to the UE via the Uu interface, completing the data transmission. The access IAB node maintains a connection with the gNB-CU-UP in the IAB-Donor over the F1 user plane (F1-U). Figure 1B This is a diagram of the protocol stack structure for control plane transmission in the IAB communication system. Figure 1BAs shown in the figure, the core network is interconnected with the gNB-CU-CP of the IAB-Donor through the NG control plane (NG-C). The DU part of each IAB node maintains the connection with the gNB-CU-CP in the IAB-Donor through the F1 interface control plane (F1-C) and transmits the F1 interface application protocol (F1AP) messages.

[0033] Figure 2A FIG. 1 is a schematic diagram of an application scenario of a control signaling transmission method provided by an embodiment. Figure 2A As shown, the first communication node in the present application may be an IAB-Donor CU in the IAB network, the second communication node may be an IAB node (IAB node) 3 in the IAB network, and the third communication node may be an IAB node 1 in the IAB network. Figure 2A As shown, UE1's uplink data is transmitted upward to IAB node3 through the Access IAB node, i.e., IAB node4. IAB node3 then submits the data to its parent IAB node (Parent IAB node, i.e., IABnode1 or IAB node2). The Parent IAB node submits the data upward to the IAB-Donor. The IAB-Donor submits the data to the UPF of the core network through the NG interface. Finally, the core network processes the data and routes it to the application layer via the Internet Protocol (IP), completing the transmission of the uplink data. In the above uplink data transmission process, the intermediate transmission node IABnode3 has two Parent IAB nodes (IAB node1 or IAB node2). Currently, there is no regulation on how IAB node3 specifically selects which Parent IAB node to perform uplink data transmission.

[0034] Figure 2B FIG. 1 is a schematic diagram of another application scenario of a control signaling transmission method provided in an embodiment. Figure 2BAs shown, the first communication node in this application can be an IAB-Donor CU in the IAB network, the second communication node can be an IAB node4 in the IAB network, and the third communication node can be an IAB node2 in the IAB network. In this scenario, IABnode3 and IAB node4 are both Access IAB nodes. UE1 accesses IAB node3, and UE2 accesses IAB node4. UE2's uplink data is transmitted upward through IAB node4 to the Parent IAB node, i.e., IAB node1 or IAB node2. The Parent IAB node then delivers the data upward to the IAB-Donor. The IAB-Donor delivers it to the UPF of the core network through the NG interface. Finally, the core network processes the data and routes it to the application layer via IP, completing the transmission of the uplink data. In the above-mentioned uplink data transmission process, the access transmission node IAB node4 has two Parent IAB nodes (IAB node1 or IABnode2). Currently, there is no regulation on how IAB node4 specifically selects which Parent IAB node to perform uplink data transmission.

[0035] The present application provides a control signaling transmission method, which enables the first communication node to configure the next hop routing information for the second communication node in advance, so that the second communication node can accurately transmit the uplink data to the corresponding next hop third communication node. In other words, in the present application, the IAB-Donor CU can be configured in advance for the

[0036] Figure 2A IAB node3 in or Figure 2B The IAB node4 in the process configures the next hop routing node information and the corresponding cell information so that the IAB node3 or the IAB node4 can accurately transmit the uplink data to the corresponding Parent IAB node and the corresponding cell.

[0037] Figure 3 FIG. 1 is a flow chart of a control signaling transmission method provided in an embodiment. Figure 3 As shown, this embodiment includes the following steps:

[0038] Step 301: The first communication node sends next-hop routing information of uplink data transmission to the second communication node.

[0039] The next-hop routing information of the uplink data transmission includes identification information of a third communication node that is the next hop of the second communication node.

[0040] In one implementation, the first communication node sends the next hop routing information of the uplink data transmission to the second communication node via F1AP.

[0041] In one implementation, the next-hop routing information for uplink data transmission includes the following five implementations.

[0042] In the first implementation method, the next-hop routing information of the uplink data transmission includes: the mapping relationship between the routing identifier (routing ID) of the uplink data packet of the second communication node and the backhaul adaptation protocol (BAP) address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the cell group identifier (Cell Group ID, CGI) of the third communication node.

[0043] In this implementation, the third communication node may send the CGI of the third communication node to the first communication node. The first communication node receives the CGI of the third communication node sent by the third communication node.

[0044] In the second implementation method, the next-hop routing information of the uplink data transmission includes: the mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the new radio access global cell identifier (NR Cell Global Identifier, NR CGI) of the third communication node.

[0045] In the third implementation method, the next-hop routing information of the uplink data transmission includes: the mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the physical layer cell identifier (Physical Cell Identifier, PCI) of the third communication node.

[0046] In the fourth implementation method, the next-hop routing information of the uplink data transmission includes: the mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the secondary cell identifier (Secondary cell Identifier, Scell ​​ID) of the cell group where the third communication node is located.

[0047] In the fifth implementation method, the next-hop routing information of the uplink data transmission includes: the mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the primary cell identifier (primary cell of a master or secondary cell group identifier, Spcell ID) of the cell group where the third communication node is located.

[0048] In one implementation, the third communication node is any one of the parent nodes of the second communication node.

[0049] The following takes the first implementation as an example to describe in detail the interaction process among the first communication node, the second communication node, and the third communication node.

[0050] Step A1: The third communication node sends a UE context establishment request message to the first communication node through F1AP.

[0051] The UE context establishment request message includes CGI information of the third communication node.

[0052] Step A2: The first communication node receives a UE context establishment request message sent by the third communication node through F1AP.

[0053] Step A3: The first communication node obtains the CGI information of the third communication node from the UE context establishment request message, and responds to the UE context establishment request message, that is, sends a UE context establishment response message to the third communication node.

[0054] Step A4: the first communication node sends the next hop routing information of the uplink data transmission to the second communication node via F1AP.

[0055] After receiving the CGI of the third communication node, the first communication node generates the next-hop routing information of the uplink data transmission of the second communication node based on the CGI of the third communication node, the BAP address of the third communication node, the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and sends it to the second communication node.

[0056] The following Figure 2A Taking the scenario shown in the figure as an example, the interaction process between the first, second, and third communication nodes is described in detail. The first communication node can be an IAB-Donor CU in an IAB network, the second communication node can be IAB node3, and the third communication node can be IAB node1. Of course, the third communication node can also be IAB node2. The following description uses IAB node1 as the third communication node as an example.

[0057] When the next-hop routing information of the uplink data transmission is implemented in the first manner, the control signaling transmission method provided in this embodiment includes the following steps.

[0058] Step B1: IAB node1 sends a UE context establishment request message to the IAB-Donor CU via F1AP.

[0059] The UE context establishment request message includes the CGI information of the IAB node1.

[0060] Step B2: The IAB-Donor CU receives the UE context establishment request message sent by IAB node1.

[0061] Step B3: The IAB-Donor CU obtains the CGI information of IAB node1 from the UE context establishment request message, and responds by sending a UE context establishment response message to IAB node1.

[0062] Step B4: The IAB-Donor CU configures the next-hop routing information for uplink data transmission to IAB node 3 through F1AP.

[0063] The next-hop routing information of the uplink data transmission includes a mapping relationship between the routing identifier of the uplink data packet of IAB node3 and the BAP address of IAB node1, and a mapping relationship between the BAP address of IAB node1 and the CGI of IABnode1.

[0064] The IAB-Donor CU configures the mapping relationship between the routing identifier of the uplink data packet of IAB node3 and the BAP address of IAB node1 to IAB node3 through F1AP.

[0065] Table 1 shows the mapping relationship between the routing identifier of the uplink data packet of IAB node3 and the BAP address of IAB node1.

[0066] As shown in Table 1 below, after receiving the uplink data packet, IAB node 3 inputs the routing ID (including the destination BAP address and path ID) in the BAP subheader of the uplink data packet, queries Table 1 to obtain the BAP address information of the next hop Parent IAB node (IAB node 1), and then delivers the data packet to the corresponding Parent IAB node (IAB node 1).

[0067] Table 1 Mapping relationship between the routing identifier of the uplink data packet of IAB node3 and the BAP address of IAB node1

[0068]

[0069] At the same time, the IAB-Donor CU also needs to configure the mapping relationship between the BAP address of the next-hop Parent IAB node (IAB node 1) and the corresponding CGI to IAB node 3 through F1AP. Table 2 shows the mapping relationship between the BAP address of IAB node 1 and the CGI of IAB node 1. As shown in Table 2 below, when IAB node 3 receives an uplink data packet, it can find the corresponding CGI and the corresponding cell group based on the BAP address of the Parent IAB node (IAB node 1) obtained from Table 1 and Table 2. It then delivers the data packet to the corresponding RLC entity and Medium Access Control (MAC) entity for uplink data transmission.

[0070] Table 2 Mapping relationship between IAB node 1's BAP address and IAB node 1's CGI

[0071]

[0072] When the next-hop routing information of the uplink data transmission is the second to fifth implementations described above, the control signaling transmission method provided in this embodiment includes the following steps.

[0073] Step C1: IAB node1 sends a UE context establishment request message to the IAB-Donor CU via F1AP.

[0074] Step C2: The IAB-Donor CU receives the UE context establishment request message sent by IAB node1.

[0075] Step C3: The IAB-Donor CU sends a UE context establishment response message to the IAB node1.

[0076] Step C4: The IAB-Donor CU configures the next-hop routing information for uplink data transmission to IAB node 3 through F1AP.

[0077] The next-hop routing information of the uplink data transmission includes: the second implementation manner to the fifth implementation manner of the above-mentioned next-hop routing information of the uplink data transmission.

[0078] The IAB-Donor CU configures the mapping relationship between the routing identifier of the uplink data packet of IAB node3 and the BAP address of IAB node1 to IAB node3 through F1AP.

[0079] As shown in Table 1 above, after receiving the uplink data packet, IAB node 3 inputs the routing ID (including the destination BAP address and path ID) in the BAP subheader of the uplink data packet, queries Table 1 to obtain the BAP address information of the next hop Parent IAB node (IAB node 1), and then delivers the data packet to the corresponding Parent IAB node (IAB node 1).

[0080] At the same time, the IAB-Donor CU also needs to configure the mapping relationship between the BAP address of the next-hop Parent IAB node (IAB node 1) and the cell identity information of the corresponding Parent IAB node (IAB node 1) to IAB node 3 through F1AP, such as the mapping relationship between the BAP address of IAB node 1 and the NR CGI, or the mapping relationship between the BAP address of IAB node 1 and the PCI information. As shown in Table 3.

[0081] Alternatively, the IAB-Donor CU configures the mapping relationship between the BAP address of the next-hop Parent IAB node (IABnode1) and the Spcell ID or Scell ​​ID information of the cell group where the corresponding Parent IAB node (IAB node1) is located to IAB node3 through F1AP, as shown in Table 4 and Table 5.

[0082] When receiving an uplink data packet, the IAB node 3 finds the corresponding cell according to the mapping table shown in Table 3, Table 4 or Table 5, and then delivers the data packet to the corresponding RLC / MAC entity for uplink data transmission.

[0083] Table 3. Mapping relationship between Parent IAB node's BAP address and NR CGI / PCI

[0084]

[0085] Table 4. Mapping relationship between BAP address and Spcell ID of Parent IAB node

[0086]

[0087] Table 5. Mapping relationship between BAP address and Scell ​​ID of Parent IAB node

[0088]

[0089] against Figure 2B In the scenario shown, the first communication node may be an IAB-Donor CU in an IAB network, the second communication node may be IAB node4, and the third communication node may be IAB node2. Of course, the third communication node may also be IAB node1. The following description uses IAB node2 as an example. The control signaling transmission method provided in this embodiment includes the following steps.

[0090] Step D1: IAB node2 sends a UE context establishment request message to the IAB-Donor CU via F1AP.

[0091] Step D2: The IAB-Donor CU receives the UE context establishment request message from IAB node2.

[0092] Step D3: The IAB-Donor CU sends a UE context establishment response message to the IAB node2.

[0093] Step D4: The IAB-Donor CU configures the next-hop routing information for uplink data transmission to the IAB node 4 through the F1AP.

[0094] When the next hop routing information of the uplink data transmission is the first implementation mode, in step D1, IABnode2 also carries the CGI information of IAB node2 in the UE context establishment request message. In step D3, IAB-DonorCU obtains the CGI information of IAB node2 from the UE context establishment request message.

[0095] The control signaling transmission method provided in this embodiment sends the next-hop routing information of the uplink data transmission to the second communication node through the first communication node. The next-hop routing information of the uplink data transmission includes the identification information of the third communication node that is the next hop of the second communication node. This enables the first communication node to configure the next-hop routing information of the uplink data transmission for the second communication node in advance, so that the second communication node can accurately transmit the uplink data to the corresponding third communication node that is the next hop, thereby improving the accuracy and reliability of data transmission.

[0096] Figure 4 A schematic diagram of an application scenario of a control signaling transmission method provided in another embodiment. Figure 4 As shown, the first communication node in the present application may be IAB-Donor CU2, the second communication node may be IAB node3, and IAB-Donor CU1 is the source first communication node before the switching of IAB node3. In the IAB scenario, when the IAB node is switched, that is, the serving IAB-Donor (gNB) changes, there is currently no provision for how the switched IAB node synchronizes the new radio access global cell identity (NR Cell Global Identifier, NR CGI) with the switched IAB-Donor.

[0097] The present application provides a control signaling transmission method to achieve NR CGI synchronization between the second communication node and the first communication node in a switching scenario.

[0098] Figure 5 FIG. 1 is a flow chart of a control signaling transmission method provided in an embodiment. Figure 5 As shown, the control signaling transmission method provided in this embodiment includes the following steps:

[0099] Step 501: The first communication node receives the NRCGI of the second communication node after switching, which is sent by the second communication node.

[0100] Among them, the NR CGI after switching includes: the public land mobile network (PLMN) identifier, the base station identifier (gNB ID) of the first communication node, and the cell identifier (Cell ID) within the base station of the source first communication node before switching.

[0101] In one implementation, the first communication node in this application refers to a new first communication node after the second communication node is switched.

[0102] In one embodiment, the NR CGI consists of two parts: the PLMN ID and the NR cell identifier (NR Cell ID), where the NR cell ID consists of the gNB ID and the cell ID within the base station. Figure 6 A schematic diagram of the structure of the NR CGI provided for one embodiment.

[0103] In one implementation, when the second communication node switches from the source first communication node to the new first communication node, it can first obtain the gNB ID of the new first communication node from the source first communication node, and then generate the NR CGI after switching based on the PLMN ID, the gNB ID of the new first communication node and the CellID in the base station of the source first communication node.

[0104] In one implementation, the second communication node sends an F1 setup request message to the first communication node via the F1AP, where the F1 setup request message includes the switched NR CGI. Accordingly, the first communication node receives the F1 setup request message sent by the second communication node via the F1AP, and obtains the switched NRCGI of the second communication node from the F1 setup request message.

[0105] Step 502: When the first communication node determines that the NR CGI after switching conflicts with the NR CGI of any communication node that the first communication node has served, a conflict resolution step is performed.

[0106] In one embodiment, when the first communication node determines that the intra-base station Cell ID in the NR CGI after switching conflicts with the intra-base station Cell ID of any communication node that the first communication node has served, a conflict resolution step is performed.

[0107] In one implementation, the first communication node may perform the conflict resolution step specifically as follows: the first communication node allocates a new NR CGI to the second communication node.

[0108] Among them, the newly allocated NR CGI does not conflict with the NR CGI of any communication node already served by the first communication node.

[0109] In one implementation, the first communication node sends an F1 setup failure message to the second communication node via the F1AP, wherein the F1 setup failure message includes: a newly allocated NR CGI and a F1 setup failure reason, wherein the F1 setup failure reason is an NRCGI conflict.

[0110] In this implementation, after receiving the F1 establishment failure message, the second communication node reads the establishment failure reason, obtains the newly allocated NR CGI, and uses the newly allocated NR CGI as its own NR CGI. Afterwards, the second communication node uses the newly allocated NR CGI to resend the F1 establishment request message to the first communication node, and the F1 establishment request message carries the newly allocated NR CGI. After receiving the F1 establishment request message, the first communication node replies with an F1 establishment request response message to the second communication node. The second communication node receives the F1 establishment request response message and completes the F1 connection establishment process with the first communication node.

[0111] In another implementation, the first communication node sends an F1 establishment response message to the second communication node through F1AP; wherein the F1 establishment response message includes the newly allocated NR CGI.

[0112] The following Figure 4 Take this as an example to explain the above process in detail.

[0113] Please continue to refer to Figure 4 When IAB node 3 switches from its original serving base station IAB-Donor1 (gNB1) to its new serving base station IAB-Donor2 (gNB2), it first obtains the gNB ID (gNB ID2) of the target base station IAB-Donor2 (gNB2) from its original serving base station IAB-Donor CU1 and then establishes an F1 connection with IAB-Donor CU2. Specifically, IAB node 3 sends an F1 setup request to IAB-Donor CU2 via the F1AP, carrying the newly allocated NR Cell ID. The NR Cell ID in the newly allocated NR CGI consists of gNB ID2 and the original intra-base cell ID. In this case, if the intra-base cell ID of another IAB node served by IAB-Donor CU2 coincides with the original cell ID reported by IAB node 3, the NR CGI of IAB node 3 will be the same as that of the other IAB node served by IAB-Donor CU2, resulting in an NR CGI conflict.

[0114] exist Figure 4 In the illustrated scenario, in one implementation, the control signaling transmission method provided in this embodiment includes the following steps.

[0115] Step E1: After switching to the new serving base station IAB-Donor2 (gNB2), IAB node3 needs to establish an F1 connection with IAB-Donor CU2.

[0116] Specifically, IAB node3 sends an F1 setup request message to IAB-Donor CU2 through F1AP, and carries the NR CGI information after switching in the message. The NR Cell ID in the switched NR CGI consists of gNB ID2 and the original cell ID within the base station.

[0117] Step E2: IAB-Donor CU2 receives the F1 setup request message from IAB node3 through F1AP, reads the NR CGI therein, and finds that the NR CGI is the same as the NR CGI of other IAB nodes connected to IAB-Donor CU2, resulting in an NR CGI conflict.

[0118] Step E3: IAB-Donor CU2 re-allocates a new intra-base station cell ID for IAB node3, forms a newly allocated NR CGI, and sends it to IAB node3 through an F1 setup response message.

[0119] Step E4: IAB node 3 receives the F1 establishment response message, reads the NR CGI in it, and finds that the NR CGI in it is different from its original NR CGI. IAB node 3 uses the newly allocated NR CGI of IAB-Donor CU2 as its own NRCGI, completes the F1 connection establishment with IAB-Donor CU2, and uses the newly allocated NR CGI to perform subsequent F1AP message transmission with IAB-Donor CU2.

[0120] exist Figure 4 In the illustrated scenario, in another implementation, the control signaling transmission method provided in this embodiment includes the following steps.

[0121] Step F1: After switching to the new serving base station IAB-Donor2 (gNB2), IAB node3 needs to establish an F1 connection with IAB-Donor CU2.

[0122] Specifically, IAB node3 sends an F1 setup request message to IAB-Donor CU2 through F1AP, and carries the NR CGI information after switching in the message. The NR Cell ID in the switched NR CGI consists of gNB ID2 and the original cell ID within the base station.

[0123] Step F2: IAB-Donor CU2 receives the F1 setup request message from IAB node3 through F1AP, reads the NR CGI therein, and finds that the NR CGI is the same as the NR CGI of other IAB nodes connected to IAB-Donor CU2, resulting in an NR CGI conflict.

[0124] Step F3: IAB-Donor CU2 re-assigns a new cell ID within the base station to the IAB node3 to form a newly allocated NR CGI, and sends it to IAB node3 through an F1 failure response message. In the F1 failure response message, the failure cause is set to Cell ID conflict.

[0125] Step F4: IAB node 3 receives the F1 failure response message and reads the failure cause as Cell ID conflict. At the same time, IAB node 3 reads the NR CGI newly allocated by IAB-Donor CU2 from the F1 failure response message as its own NR CGI.

[0126] Step F5: IAB node 3 sends an F1 setup request message to IAB-Donor CU2 using the newly allocated NR CGI;

[0127] Step F6: IAB-Donor CU2 replies to IAB node3 with an F1 establishment request response message.

[0128] Step F7: IAB node 3 receives the F1 establishment response message, completing the F1 connection establishment process with IAB-Donor CU2.

[0129] In this implementation, IAB-Donor CU2 replies with a failure response message to IAB node3, which enables IABnode3 to more clearly understand the reason why IAB-Donor CU2 changes the NR CGI, thereby improving the reliability of data transmission.

[0130] The control signaling transmission method provided in this embodiment receives, by a first communication node, the NR CGI of the second communication node after switching, which is sent by the second communication node, wherein the NR CGI after switching includes: a PLMN identifier, a base station identifier of the first communication node, and an intra-base station cell identifier of the source first communication node before switching. When the first communication node determines that the NRCGI after switching conflicts with the NRCGI of the communication node served by the first communication node, the conflict resolution step is performed, thereby achieving synchronization of the NR CGI of the first communication node and the second communication node in a scenario where the first communication node switches, thereby improving the reliability and accuracy of subsequent data transmission.

[0131] Figure 7 FIG. 1 is a flow chart of a control signaling transmission method provided in another embodiment. Figure 7 As shown, the control signaling transmission method provided in this embodiment includes the following steps.

[0132] Step 701: The second communication node sends the NRCGI of the second communication node after switching to the first communication node.

[0133] Among them, the NR CGI after switching includes: PLMN identifier, base station identifier of the first communication node and cell identifier within the base station of the source first communication node before switching.

[0134] In one embodiment, after the second communication node sends the NR CGI of the second communication node after switching to the first communication node, the method further includes: the second communication node receiving the NR CGI newly allocated by the first communication node to the second communication node. The newly allocated NR CGI does not conflict with the NR CGI of any communication node already served by the first communication node, and the newly allocated NR CGI is determined by the first communication node when it determines that the NR CGI after switching conflicts with the NR CGI of the communication node already served by the first communication node.

[0135] In one embodiment, the second communication node sends the switched NRCGI of the second communication node to the first communication node, including: the second communication node sends an F1 setup request message to the first communication node via the F1AP, wherein the F1 setup request message includes the switched NR CGI of the second communication node.

[0136] In one embodiment, the second communication node receives a newly allocated NR CGI from the first communication node, including: the second communication node receives an F1 setup failure message sent by the first communication node via the F1AP. The F1 setup failure message includes: the newly allocated NR CGI and a reason for the F1 setup failure, wherein the reason for the F1 setup failure is a NR CGI conflict.

[0137] In one embodiment, the second communication node receives the NRCGI newly allocated by the first communication node to the second communication node, including: the second communication node receives the F1 establishment response message sent by the first communication node through the F1AP; wherein the F1 establishment response message includes the newly allocated NR CGI.

[0138] The control signaling transmission method provided in this embodiment sends the NR CGI of the second communication node after switching to the first communication node through the second communication node, so that in the scenario where the first communication node switches, the first communication node and the second communication node synchronize the NR CGI, thereby improving the reliability and accuracy of subsequent data transmission.

[0139] Figure 8 FIG. 1 is a schematic diagram of a control signaling transmission device provided in an embodiment. The device may be provided in a first communication node. Figure 8 As shown, the control signaling transmission device provided in this embodiment includes a sending module 81.

[0140] The sending module 81 is configured to send the next hop routing information of the uplink data transmission to the second communication node.

[0141] The next-hop routing information of the uplink data transmission includes identification information of a third communication node that is the next hop of the second communication node.

[0142] In one embodiment, the sending module 81 is specifically configured to send the next hop routing information of the uplink data transmission to the second communication node via the F1AP.

[0143] In one embodiment, the apparatus further includes a receiving module configured to receive a CGI of a third communication node sent by the third communication node.

[0144] In one embodiment, the receiving module is specifically configured to receive a terminal context establishment request message sent by the third communication node via F1AP, wherein the terminal context establishment request message includes CGI information of the third communication node.

[0145] In one embodiment, the sending module 81 is further configured to send a terminal context establishment response message to the third communication node.

[0146] In one implementation, the next-hop routing information of the uplink data transmission includes: a mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and a mapping relationship between the BAP address of the third communication node and the CGI of the third communication node.

[0147] In another implementation, the next-hop routing information of the uplink data transmission includes: a mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and a mapping relationship between the BAP address of the third communication node and the NR CGI of the third communication node.

[0148] In another implementation, the next-hop routing information of the uplink data transmission includes: a mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and a mapping relationship between the BAP address of the third communication node and the PCI of the third communication node.

[0149] In another implementation, the next-hop routing information of the uplink data transmission includes: a mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and a mapping relationship between the BAP address of the third communication node and the secondary cell identifier of the cell group where the third communication node is located.

[0150] In another implementation, the next-hop routing information of the uplink data transmission includes: a mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and a mapping relationship between the BAP address of the third communication node and the primary cell identifier of the cell group where the third communication node is located.

[0151] The control signaling transmission device provided in this embodiment is used to implement Figure 3 The control signaling transmission method of the illustrated embodiment and the control signaling transmission device provided in this embodiment have similar implementation principles and technical effects, which will not be repeated here.

[0152] Figure 9 FIG. 1 is a structural diagram of a control signaling transmission device provided in another embodiment. The device may be provided in a first communication node. Figure 9As shown, the control signaling transmission device provided in this embodiment includes: a receiving module 91 and a conflict resolution step execution module 92.

[0153] The receiving module 91 is configured to receive the NRCGI of the second communication node after switching, which is sent by the second communication node.

[0154] Among them, the NR CGI after switching includes: PLMN identifier, base station identifier of the first communication node and cell identifier within the base station of the source first communication node before switching.

[0155] The conflict resolution step execution module 92 is configured to execute the conflict resolution step when it is determined that the NR CGI after switching conflicts with the NR CGI of any communication node already served by the first communication node.

[0156] In one embodiment, the conflict resolution step execution module 92 is specifically configured to allocate a new NR CGI to the second communication node, wherein the newly allocated NR CGI does not conflict with the NR CGI of any communication node already served by the first communication node.

[0157] In one embodiment, the receiving module 91 is specifically configured to: receive an F1 establishment request message sent by the second communication node through the F1AP; and obtain the NRCGI of the second communication node after switching from the F1 establishment request message.

[0158] In one embodiment, the conflict resolution step execution module 92 is specifically configured to send an F1 establishment failure message to the second communication node via the F1AP. The F1 establishment failure message includes: the NR CGI newly allocated by the first communication node to the second communication node and the reason for the F1 establishment failure, wherein the reason for the F1 establishment failure is an NR CGI conflict.

[0159] In one embodiment, the conflict resolution step execution module 92 is specifically configured to: send an F1 setup response message to the second communication node via the F1AP, wherein the F1 setup response message includes the NR CGI newly allocated by the first communication node to the second communication node.

[0160] The control signaling transmission device provided in this embodiment is used to implement Figure 5 The control signaling transmission method of the illustrated embodiment and the control signaling transmission device provided in this embodiment have similar implementation principles and technical effects, which will not be repeated here.

[0161] Figure 10 FIG. 1 is a structural diagram of a control signaling transmission device provided in another embodiment. The control signaling transmission device may be provided in the second communication node. Figure 10 As shown, the control signaling transmission device provided in this embodiment includes a sending module 93.

[0162] The sending module 93 is configured to send the switched NRCGI of the second communication node to the first communication node.

[0163] Among them, the NR CGI after switching includes: PLMN identifier, base station identifier of the first communication node and cell identifier within the base station of the source first communication node before switching.

[0164] In one embodiment, the apparatus further includes a receiving module configured to receive an NR CGI newly allocated by the first communication node to the second communication node. The newly allocated NR CGI does not conflict with an NR CGI of any communication node already served by the first communication node, and the newly allocated NR CGI is determined by the first communication node when determining that the NR CGI after the handover conflicts with an NR CGI of any communication node already served by the first communication node.

[0165] In one embodiment, the sending module 93 is specifically configured to send an F1 setup request message to the first communication node via the F1AP, wherein the F1 setup request message includes the NR CGI after the handover of the second communication node.

[0166] In one embodiment, the receiving module is configured to receive an F1 establishment failure message sent by the first communication node via the F1AP, wherein the F1 establishment failure message includes a newly allocated NR CGI and an F1 establishment failure reason, wherein the F1 establishment failure reason is an NR CGI conflict.

[0167] In one embodiment, the receiving module is configured to receive an F1 setup response message sent by the first communication node via the F1AP, wherein the F1 setup response message includes the newly allocated NR CGI.

[0168] The control signaling transmission device provided in this embodiment is used to implement Figure 7 The control signaling transmission method of the illustrated embodiment and the control signaling transmission device provided in this embodiment have similar implementation principles and technical effects, which will not be repeated here.

[0169] Figure 11 A structural diagram of a control signaling transmission device provided in yet another embodiment. Figure 11 As shown, the control signaling transmission device includes a processor 94. Optionally, it also includes a memory 99, a power supply component 95, a receiver 96, a transmitter 97 and an antenna 98. The number of processors 94 in the control signaling transmission device can be one or more. Figure 11 In the example, a processor 94 is used; the processor 94 and the memory 99, the power supply component 95, the receiver 96 and the transmitter 97 in the control signaling transmission device can be connected via a bus or other means. Figure 11 In the example, a bus connection is used, wherein a receiver 96 is connected to a transmitter 97 and an antenna 98 .

[0170] The memory 99 is a computer-readable storage medium that can be used to store software programs, computer executable programs, and modules. Figure 3 、 Figure 5 and Figure 7 The program instructions / modules corresponding to the control signaling transmission method in the embodiment (for example, the sending module 81 in the control signaling transmission device, or the receiving module 91 and the conflict resolution step execution module 92 in the control signaling transmission device, or the sending module 93 in the control signaling transmission device). The processor 94 executes the various functional applications and data processing of the control signaling transmission device by running the software programs, instructions and modules stored in the memory 99, that is, realizing Figure 3 And the control signaling transmission method of each optional implementation, or, to implement Figure 5 And the control signaling transmission method of each optional implementation, or, to implement Figure 7 And control signaling transmission methods of various optional implementations.

[0171] The memory 99 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the control signaling transmission device. Furthermore, the memory 99 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0172] Power supply assembly 95 provides power to the various modules of the control signaling transmission device. Power supply assembly 95 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the control signaling transmission device. Transmitter 97 is configured to transmit signals to other devices via antenna 98, and receiver 96 is configured to receive signals from other devices via antenna 98.

[0173] An embodiment of the present application also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to execute the control signaling transmission method provided by any embodiment of the present application.

[0174] The above description is merely an exemplary embodiment of the present application and is not intended to limit the scope of protection of the present application.

[0175] It will be appreciated by those skilled in the art that the term user terminal covers any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser or a vehicle-mounted mobile station.

[0176] In general, various embodiments of the present application may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.

[0177] Embodiments of the present application may be implemented by executing computer program instructions by a data processor of a mobile device, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages.

[0178] The block diagram of any logical flow in the accompanying drawings of the present application can represent program steps, or can represent interconnected logical circuits, modules and functions, or can represent a combination of program steps and logical circuits, modules and functions. The computer program can be stored on a memory. The memory can have any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read-only memory (ROM), random access memory (RAM), optical memory device and system (digital versatile disc DVD or CD optical disc) etc. Computer-readable media can include non-transient storage media. The data processor can be any type suitable for the local technical environment, such as but not limited to a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (FPGA) and a processor based on a multi-core processor architecture.

[0179] The above description of exemplary embodiments of the present application has been provided by way of exemplary and non-limiting examples. However, various modifications and adaptations of the above embodiments will be apparent to those skilled in the art, when considered in conjunction with the accompanying drawings and the appended claims, without departing from the scope of the present application. Therefore, the proper scope of the present application will be determined by reference to the appended claims.

Claims

1. A control signaling transmission method, characterized in that: include: The first communication node sends the next hop routing information of the uplink data transmission to the second communication node; wherein the next hop routing information of the uplink data transmission includes the identification information of the third communication node that is the next hop of the second communication node; The next hop routing information of the uplink data transmission includes: A mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and a mapping relationship between the BAP address of the third communication node and the new radio access global cell identifier NRCGI of the third communication node; or A mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and a mapping relationship between the BAP address of the third communication node and the physical layer cell identifier PCI of the third communication node; Among them, the next-hop routing information is used to enable the second communication node to find the corresponding cell according to the mapping relationship between the BAP address of the third communication node and the NR CGI of the third communication node, or according to the mapping relationship between the BAP address of the third communication node and the PCI of the third communication node when receiving the uplink data packet, and send the uplink data to the wireless link layer control RLC / medium access control MAC entity for uplink data transmission.

2. The method according to claim 1, characterized in that Before the first communication node sends the next hop routing information of the uplink data transmission to the second communication node, the method further includes: The first communication node receives the cell group identifier CGI of the third communication node sent by the third communication node.

3. The method according to claim 2, characterized in that The first communication node receiving the CGI of the third communication node sent by the third communication node includes: The first communication node receives a terminal context establishment request message sent by the third communication node through the F1 interface application protocol F1AP; wherein the terminal context establishment request message includes CGI information of the third communication node.

4. The method according to claim 1, wherein The first communication node sending next hop routing information of uplink data transmission to the second communication node includes: The first communication node sends the next hop routing information of the uplink data transmission to the second communication node through F1AP.

5. The method according to claim 1, characterized in that The next hop routing information of the uplink data transmission includes: The mapping relationship between the routing identifier of the uplink data packet of the second communication node and the backhaul adaptation protocol BAP address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the CGI of the third communication node; or The mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the secondary cell identifier of the cell group where the third communication node is located; or The mapping relationship between the routing identifier of the uplink data packet of the second communication node and the BAP address of the third communication node, and the mapping relationship between the BAP address of the third communication node and the primary cell identifier of the cell group where the third communication node is located.

6. A control signaling transmission device, characterized in that: include: processor; The processor is configured to implement the control signaling transmission method according to any one of claims 1 to 5 when executing a computer program.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the control signaling transmission method according to any one of claims 1 to 5 is implemented.

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