CN110719614B - Data transmission method and system - Google Patents
Data transmission method and system Download PDFInfo
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- CN110719614B CN110719614B CN201810768256.5A CN201810768256A CN110719614B CN 110719614 B CN110719614 B CN 110719614B CN 201810768256 A CN201810768256 A CN 201810768256A CN 110719614 B CN110719614 B CN 110719614B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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Abstract
The invention discloses a data transmission method and a system, comprising the following steps: the UE sequentially sends a plurality of data packets to a first IAB node in the IAB multi-hop nodes and the data packets are sequentially transmitted to the next IAB node by the first IAB node; after the first IAB node makes a switching decision, the first IAB node acquires the transmission condition of a data packet in an IAB multi-hop node from a next IAB node; the first IAB node determines whether the IAB multi-hop node transmits the data packet back to the first IAB node according to the transmission condition of the data packet in the IAB multi-hop node; the first IAB node forwards the data packet to the switched target IAB node. By adopting the data transmission method and the system, the problem that the data packet processing in the switching process of the node is generated when the data packet sent by the UE is transmitted in the multi-hop node and is not completed in the IAB scene is solved, so that the UE does not need to retransmit the data packet, and the data packet transmission overhead is saved.
Description
Technical Field
The invention relates to a mobile communication technology, in particular to a data transmission method and a data transmission system in an IAB scene switching process in a 5G NR evolution process.
Background
In the evolution process of 5G NR (New Radio), it is proposed that an IAB (Integrated Access and Backhaul) function needs to be supported.
Currently, IAB has determined that multi-hop is supported, but it has not been determined which relay is supported. The alternative schemes are as follows: layer 1relay, Layer 2relay, and Layer 3 relay.
An ARQ (Automatic Repeat Request) is a main function of an RLC layer (link layer), a basic process is as shown in fig. 1, a sending end sends a Data packet (Data), and may carry a Poll bit in the Data packet after a period of time (for convenience of description, the Poll bit is shown in fig. 1, and actually sent together with the Data packet), a receiving end replies a Status report (Status report) after receiving the Poll bit, the Status report includes ACK/NAK information of each Data packet, and finally the sending end determines which Data packets are not received and retransmitted to the receiving end after receiving the Status report (Re-transmission). It should be noted that "ACK/NAK" shown in fig. 1 is a part of the content in the "status report" and is not sent separately from the "status report", and the "ACK/NAK" shown in fig. 1 is only used to emphasize that the receiving end feeds back "ACK/NAK" to the transmitting end, and does not represent the actual situation.
Currently, in an IAB scenario, how to process data which is not successfully transmitted in a handover process is not considered.
Disclosure of Invention
In view of this, the present invention provides a data transmission method and system, so as to implement that, in the handover process in an IAB scenario, data that is not successfully transmitted is correspondingly processed along with the handover, thereby saving the overhead of data packet transmission.
The technical scheme of the invention is realized as follows:
a method of data transmission, comprising:
the method comprises the steps that User Equipment (UE) sequentially sends a plurality of data packets to a first IAB node in an integrated access backhaul IAB multi-hop node, and the first IAB node sequentially transmits the data packets to a next IAB node in the IAB multi-hop node;
after the first IAB node makes a switching decision, the first IAB node acquires the transmission condition of the data packet in the IAB multi-hop node from the next IAB node;
the first IAB node determines whether the IAB multi-hop node transmits a data packet back to the first IAB node according to the transmission condition of the data packet in the IAB multi-hop node;
and the first IAB node forwards the data packet to the switched target IAB node.
Further, the acquiring, by the first IAB node, the transmission condition of the data packet in the IAB multi-hop node to the next IAB node includes:
the first IAB node sends a state request message to the next IAB node;
and after receiving the state request message, the next IAB node feeds back a state report message to the first IAB node.
Further, the status request message includes:
the method comprises one or more of bearer identification, service identification, user terminal identification, identification of data packets which are requested to be transmitted back and have not been transmitted successfully, and request for continuing transmitting the data packets which have not been transmitted successfully until transmission is successful.
Further, the status report message includes:
one or more of a list of packets that have not been successfully transmitted, a quality or status of a connection between the next IAB node and the IAB host, and an indication to suggest backtracking or to continue transmission.
Further, after the first IAB node determines to pass back the data packet:
the first IAB node sends a data backhaul message to the next IAB node to inform the next IAB node to start backhaul;
the next IAB node transmits the data packet which is not transmitted successfully back to the first IAB node;
and the first IAB node receives the data packet returned by the next IAB node and forwards the data packet to the switched target IAB node.
Further, the data backhaul message includes:
back transmission indication, continuous transmission indication and back transmission data list.
Further, after the first IAB node makes a handover decision, the first IAB node starts storing data packets;
after the first IAB node determines not to return the data packet, the first IAB node finds out the data packet which is not successfully transmitted from the stored data packet and forwards the data packet to the target IAB node after switching.
Further, the data packet is a radio link control, RLC, layer data packet.
A data transmission system comprising:
the system comprises a user terminal UE, a first IAB node and a second IAB node, wherein the user terminal UE is used for sequentially sending a plurality of data packets to the first IAB node in the integrated access backhaul IAB multi-hop nodes;
the first IAB node is used for sequentially transmitting the plurality of data packets to a next IAB node in the IAB multi-hop nodes, performing switching determination, acquiring the transmission condition of the data packets in the IAB multi-hop nodes from the next IAB node after the switching determination is made, determining whether the IAB multi-hop nodes transmit the data packets back to the first IAB node according to the transmission condition of the data packets in the IAB multi-hop nodes, and forwarding the data packets to a switched target IAB node;
and the target IAB node is used for receiving the data packet after the switching.
Further, the data packet is a radio link control, RLC, layer data packet.
It can be seen from the above solutions that, with the data transmission method and system of the present invention, when a data packet sent by a UE is transmitted in a multi-hop node and is not yet completed, when a handover occurs, the data packet in transmission is forwarded back to a target IAB node after the handover along with the determination of the handover, thereby solving the problem that in an IAB scenario, the data packet sent by the UE is transmitted in the multi-hop node and the data packet processing in the handover process occurs in the node when the data packet is not yet completed, so that the UE does not need to retransmit the data packet, and the overhead of data packet transmission is saved.
Drawings
Fig. 1 is a process diagram of an ARQ function of an RLC layer;
FIG. 2 is a diagram illustrating a data transmission method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a data transmission method according to a first embodiment of the present invention;
fig. 4 is a flowchart of a data transmission method according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and examples.
As shown in fig. 2, an embodiment of the present invention provides a data transmission method, including:
step 1, a UE (User Equipment) sequentially sends a plurality of data packets to a first IAB node in IAB multi-hop nodes, and the first IAB node sequentially transmits the data packets to a next IAB node in the IAB multi-hop nodes;
step 2, after the first IAB node makes a switching decision, the first IAB node acquires the transmission condition of the data packet in the IAB multi-hop node from the next IAB node;
step 3, the first IAB node determines whether the IAB multi-hop node transmits the data packet back to the first IAB node according to the transmission condition of the data packet in the IAB multi-hop node;
and 4, the first IAB node forwards the data packet to the switched target IAB node.
In step 2, the acquiring, by the first IAB node, a transmission condition of the data packet in the IAB multi-hop node to the next IAB node may specifically include:
a first IAB node sending a Status Request (Status Request) message to a next IAB node;
and after receiving the state request message, the next IAB node feeds back a state Report (Status Report) message to the first IAB node.
The status request message includes one or more of a bearer identifier (bearer ID), a service identifier (service ID), a user equipment identifier (UE ID), an identifier of a data packet requested to be returned and not yet successfully transmitted, and a request for continuing to transmit the data packet not yet successfully transmitted until the data packet is successfully transmitted. The status report message includes one or more of a list of packets that have not been successfully transmitted, a quality or status of a connection between the next IAB node and the IAB host, and an indication that backhaul or continued transmission is recommended.
In one embodiment, in step 3, after the first IAB node determines to transmit the data packet:
the first IAB node sends a data backhaul message to the next IAB node to inform the next IAB node to start backhaul;
the next IAB node returns the data packet which is not transmitted successfully to the first IAB node;
and the first IAB node receives the data packet returned by the next IAB node and forwards the data packet to the switched target IAB node.
The data return message comprises a return instruction, a continuous transmission instruction and a return data list.
In another embodiment, in step 2, after the first IAB node makes the handover decision, the first IAB node starts storing the data packet; in step 3, after the first IAB node determines not to return the data packet, the first IAB node finds out a corresponding data packet from the stored data packets and forwards the data packet to the target IAB node after the handover.
In the embodiment of the present invention, the data packet is an RLC (Radio Link Control) layer data packet.
Fig. 3 and 4 show schematic diagrams of two specific applications of the data transmission method of the present invention, respectively. The data transmission method of the present invention is further described below with reference to fig. 3 and 4, respectively.
First embodiment
As shown in fig. 3, the first embodiment mainly includes the following steps:
step a1, the UE sends data packets to the first IAB node, and then the data packets are transmitted between the nodes in sequence: first IAB node- > second IAB node- > IAB host (donor) and each transmitting node feeds back the ACK/NAK result of the packet ARQ to the previous node based on the Poll bit of the previous node.
Step a2, the UE sends a Measurement report (Measurement report) to the first IAB node, and the first IAB node makes a handover decision.
In step a3, the first IAB node sends a Handover Request (Handover Request) message to the target IAB node for Handover negotiation.
Step a4, the first IAB node sends a Status Request message to the second IAB node asking which data is not yet transmitted to the IAB host. The sequence of the state request message and the switching request message of the switching negotiation can be exchanged. Parameters that may be included in the status request message are: a bearer ID, a service ID, a UE ID, an identifier requesting to transmit back a packet which has not been successfully transmitted, a request to continue transmitting the packet which has not been successfully transmitted until the transmission is successful, and the like. In addition, alternatively, the parameters that may be included in the status request message may be one or more of other identifications of packets that may indicate the UE, in addition to the UE ID.
Step a5, the second IAB node feeding back a Status report (Status report) message to the first IAB node, where the Status report message may include one or more of the following information: a list of packets that have not been successfully transmitted, a quality or status of a connection between the current second IAB node and the IAB host, an indication to suggest backtracking or to continue transmission, etc.
Step a6, the first IAB node determines whether to backhaul according to the status report message received from the second IAB node, and sends a Data-Return (Data-Return) message to the second IAB node to notify the start of backhaul, where the message may include information such as backhaul indication, continued transmission indication, backhaul Data list, etc. (this step is an optional step, and is not shown in fig. 3).
In step a7, the second IAB node transmits back to the first IAB node the data packet that has not been successfully transmitted, wherein the last data packet includes an end marker (end marker) information to indicate the end of the transmission (optional).
In step a8, the first IAB node receives the back-transmitted data packets from the second IAB node, the data packets are all RLC layer data packets, and the first IAB node forwards the data packets to the target IAB node.
Second embodiment
As shown in fig. 4, the second embodiment mainly includes the following steps:
step b1, the UE sends data packets to the first IAB node, and then the data packets are transmitted between the nodes in sequence: first IAB node- > second IAB node- > IAB host (donor) and each transmitting node feeds back the ACK/NAK result of the packet ARQ to the previous node based on the Poll bit of the previous node.
Step b2, the UE sends a Measurement report (Measurement report) to the first IAB node, and the first IAB node makes a handover decision.
Step b3, the first IAB node stores the packet.
In step b4, the first IAB node sends a Handover Request (Handover Request) message to the target IAB node for Handover negotiation.
Step b5, the first IAB node sends a Status Request message to the second IAB node, the Status Request message asking which data is not yet transmitted to the IAB host. The sequence of the state request message and the switching request message of the switching negotiation can be exchanged. Parameters that may be included in the status request message are: a bearer ID, a service ID, a UE ID, an identifier requesting to transmit back a packet which has not been successfully transmitted, a request to continue transmitting the packet which has not been successfully transmitted until the transmission is successful, and the like. In addition, alternatively, the parameters that may be included in the status request message may be one or more of other identifications of packets that may indicate the UE, in addition to the UE ID.
Step b6, the second IAB node feeding back a Status report (Status report) message to the first IAB node, where the Status report message may include one or more of the following information: a list of packets that have not been successfully transmitted, a quality or status of a connection between the current second IAB node and the IAB host, an indication to suggest backtracking or to continue transmission, etc.
And step b7, the first IAB node directly finds out the data packet which is not successfully transmitted from the stored data packet and forwards the data packet to the target IAB node.
In a second embodiment, different from the first embodiment, the first IAB node starts storing the data packets after making the handover decision and does not return the data packets by the second IAB node after obtaining the data packet transmission status of the second IAB node, the first IAB node directly finds out the data packets which are not successfully transmitted from the stored data packets and forwards the data packets to the target IAB node, and the second IAB node tries to transmit the current data packet before receiving further transmission path termination (termination by receiving the transmission path switching operation). The second IAB node tries to transmit the current data packet before receiving the further transmission path termination, on the one hand in order to shorten the transmission delay, and on the other hand tries to transmit the current data packet because the transmission path has not terminated the transmission yet.
In addition, an embodiment of the present invention further provides a data transmission system, including:
the system comprises a user terminal UE, a first IAB node and a second IAB node, wherein the user terminal UE is used for sequentially sending a plurality of data packets to the first IAB node in the integrated access backhaul IAB multi-hop nodes;
the first IAB node is used for sequentially transmitting the plurality of data packets to a next IAB node in the IAB multi-hop nodes, performing switching determination, acquiring the transmission condition of the data packets in the IAB multi-hop nodes from the next IAB node after the switching determination is made, determining whether the IAB multi-hop nodes transmit the data packets back to the first IAB node according to the transmission condition of the data packets in the IAB multi-hop nodes, and forwarding the data packets to a switched target IAB node;
and the target IAB node is used for receiving the data packet after the switching.
By adopting the data transmission method and the system, when the data packet sent by the UE is transmitted in the multi-hop node and is not finished, and the switching occurs, the data packet in transmission can be transmitted back and forwarded to the switched target IAB node along with the determination of the switching, so that the problem that the data packet processing in the switching process is generated by the node when the data packet sent by the UE is transmitted in the multi-hop node and is not finished in the IAB scene is solved, the UE does not need to transmit the data packet again, and the data packet transmission overhead is saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method of data transmission, comprising:
the method comprises the steps that User Equipment (UE) sequentially sends a plurality of data packets to a first IAB node in an integrated access backhaul IAB multi-hop node, and the first IAB node sequentially transmits the data packets to a next IAB node in the IAB multi-hop node;
after the first IAB node makes a switching decision, the first IAB node acquires the transmission condition of the data packet in the IAB multi-hop node from the next IAB node;
the first IAB node determines whether the IAB multi-hop node transmits a data packet back to the first IAB node according to the transmission condition of the data packet in the IAB multi-hop node;
the first IAB node forwards the data packet to a switched target IAB node;
wherein, after the first IAB node determines to pass back the data packet:
the first IAB node sends a data backhaul message to the next IAB node to inform the next IAB node to start backhaul;
the next IAB node transmits the data packet which is not transmitted successfully back to the first IAB node;
and the first IAB node receives the data packet returned by the next IAB node and forwards the data packet to the switched target IAB node.
2. The data transmission method according to claim 1, wherein the first IAB node acquires, from the next IAB node, a transmission condition of the data packet in the IAB multi-hop node, including:
the first IAB node sends a state request message to the next IAB node;
and after receiving the state request message, the next IAB node feeds back a state report message to the first IAB node.
3. The data transmission method according to claim 2, wherein the status request message comprises:
the method comprises one or more of bearer identification, service identification, user terminal identification, identification of data packets which are requested to be transmitted back and have not been transmitted successfully, and request for continuing transmitting the data packets which have not been transmitted successfully until transmission is successful.
4. The data transmission method according to claim 2, wherein the status report message comprises:
one or more of a list of packets that have not been successfully transmitted, a quality or status of a connection between the next IAB node and the IAB host, and an indication to suggest backtracking or to continue transmission.
5. The data transmission method according to claim 1, wherein the data backhaul message comprises:
back transmission indication, continuous transmission indication and back transmission data list.
6. The data transmission method according to claim 1, characterized in that:
after the first IAB node makes a handover decision, the first IAB node starts storing data packets;
after the first IAB node determines not to return the data packet, the first IAB node finds out the data packet which is not successfully transmitted from the stored data packet and forwards the data packet to the target IAB node after switching.
7. The data transmission method according to any one of claims 1 to 6, characterized in that:
the data packet is a Radio Link Control (RLC) layer data packet.
8. A data transmission system, comprising:
the system comprises a user terminal UE, a first IAB node and a second IAB node, wherein the user terminal UE is used for sequentially sending a plurality of data packets to the first IAB node in the integrated access backhaul IAB multi-hop nodes;
the first IAB node is used for sequentially transmitting the plurality of data packets to a next IAB node in the IAB multi-hop nodes, performing switching determination, acquiring the transmission condition of the data packets in the IAB multi-hop nodes from the next IAB node after the switching determination is made, determining whether the IAB multi-hop nodes transmit the data packets back to the first IAB node according to the transmission condition of the data packets in the IAB multi-hop nodes, and forwarding the data packets to a switched target IAB node;
the target IAB node is used for receiving the data packet after switching;
wherein, after the first IAB node determines to pass back the data packet:
the first IAB node sends a data backhaul message to the next IAB node to inform the next IAB node to start backhaul;
the next IAB node transmits the data packet which is not transmitted successfully back to the first IAB node;
and the first IAB node receives the data packet returned by the next IAB node and forwards the data packet to the switched target IAB node.
9. The data transmission system of claim 8, wherein:
the data packet is a Radio Link Control (RLC) layer data packet.
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| CN112398589B (en) * | 2019-08-16 | 2023-06-02 | 大唐移动通信设备有限公司 | Method and device for data transmission in relay network |
| EP4199581A4 (en) * | 2020-08-27 | 2023-10-11 | Huawei Technologies Co., Ltd. | Update or release method for backhaul configuration information, and related product |
| WO2022205252A1 (en) * | 2021-03-31 | 2022-10-06 | 富士通株式会社 | Signal sending and receiving method and apparatus, and communication system |
| CN116436577A (en) * | 2021-12-30 | 2023-07-14 | 中国移动通信有限公司研究院 | Time domain resource determining method and device and communication equipment |
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| US10136359B2 (en) * | 2015-06-30 | 2018-11-20 | Qualcomm Incorporated | Traffic flow migration in backhaul networks |
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