CN116114309A

CN116114309A - Data transmission method, communication device and communication system

Info

Publication number: CN116114309A
Application number: CN202080103916.3A
Authority: CN
Inventors: 徐小英
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2023-05-12
Also published as: WO2022126666A1

Abstract

The embodiment of the application provides a data transmission method, a communication device and a communication system. The method comprises the following steps: the access network equipment receives a first downlink double-broadcast data packet from a user plane network element, wherein the first downlink double-broadcast data packet carries first data and a first sequence number; the access network equipment determines a first PDCP sequence number corresponding to the first sequence number; the access network device sends a second downlink double-broadcast data packet to the terminal device, wherein the second downlink double-broadcast data packet carries the first data and the first PDCP sequence number. The user plane network element uniformly distributes sequence numbers for the downlink data double-broadcast data packets, and then the source access network device and the target access network device map the sequence numbers distributed by the user plane network element into PDCP sequence numbers, so that the source access network device and the target access network device can be ensured to distribute the same PDCP sequence numbers for the same downlink data double-broadcast data packets, the terminal device is prevented from discarding the data packets which are not repeatedly received when packet loss occurs, and the reliability of data transmission is improved.

Description

PCT国内申请，说明书已公开。PCT domestic application, specification has been published.

Claims

A data transmission method, comprising:

the access network equipment receives a first downlink double-broadcast data packet from a user plane network element, wherein the first downlink double-broadcast data packet carries first data and a first sequence number;

the access network equipment determines a first packet data convergence protocol PDCP sequence number corresponding to the first sequence number;

the access network device sends a second downlink double-broadcast data packet to the terminal device, wherein the second downlink double-broadcast data packet carries the first data and the first PDCP sequence number.
The method of claim 1, wherein the first sequence number is an N3 sequence number.
The method of claim 1 or 2, wherein the access network device determining a first PDCP sequence number corresponding to the first sequence number comprises:

the access network equipment determines a first PDCP COUNT value corresponding to the first sequence number;

and the access network equipment determines the first PDCP sequence number corresponding to the first PDCP COUNT value.
A method according to any of claims 1-3, wherein the access network device is a source access network device;

before the source access network device receives the first downlink bi-cast data packet from the user plane network element, the source access network device further includes:

the source access network equipment receives a third downlink double-broadcast data packet from the user plane network element, wherein the third downlink double-broadcast data packet carries second data and a second sequence number;

and the source access network equipment determines a mapping relation according to the second sequence number and the second PDCP sequence number corresponding to the third downlink double-broadcast data packet, wherein the mapping relation is used for determining the first PDCP sequence number corresponding to the first sequence number.
The method as recited in claim 4, further comprising:

And the source access network equipment sends indication information to the target access network equipment, wherein the indication information is used for indicating the mapping relation.
The method of claim 5, wherein,

the indication information carries the second sequence number and the second PDCP sequence number corresponding to the second sequence number; or,

the indication information carries the difference value between the second sequence number and the second PDCP sequence number; or,

the indication information carries a second PDCP COUNT value corresponding to the second sequence number and the second sequence number, and the second PDCP COUNT value corresponds to the second PDCP sequence number; or,

the indication information carries a difference value between the second sequence number and a second PDCP COUNT value, where the second PDCP COUNT value corresponds to the second PDCP sequence number.
The method of any of claims 4-6, further comprising:

the source access network device requests first to first equipment, wherein the first request carries information of a QoS flow group requesting for double broadcasting, and the first equipment is target access network equipment or a mobility management network element;

the source access network device receives a first response from the first device, wherein the first response carries information of a QoS flow group accepting double broadcasting, and the QoS flow group accepting double broadcasting is part or all of the QoS flow group requesting double broadcasting.
A method according to any of claims 1-3, wherein the access network device is a target access network device; the method further comprises the steps of:

the target access network equipment receives indication information from source access network equipment, wherein the indication information is used for indicating a mapping relation, and the mapping relation is used for determining the first PDCP sequence number corresponding to the first sequence number.
The method as recited in claim 8, further comprising:

the target access network equipment receives information of QoS flow groups requesting double broadcasting;

the target access network equipment determines the information of the QoS stream group receiving the double broadcasting according to the information of the QoS stream group requesting the double broadcasting;

and the target access network equipment sends the information of the QoS flow group accepting the double broadcasting to a session management network element.
The method of claim 9, wherein the target access network device receiving information of the QoS flow group requesting bi-casting comprises:

the target access network equipment receives a switching request message from source access network equipment, wherein the switching request message carries the information of the QoS stream group requesting the double broadcasting; or,

and the target access network equipment receives a switching request message from the mobility management network element, wherein the switching request message carries the information of the QoS flow group requesting the double broadcasting.
A data transmission method, comprising:

the user plane network element receives configuration information, wherein the configuration information carries information of a QoS flow group which receives double broadcasting, the QoS flow group which receives double broadcasting comprises one or more QoS flow groups, and a first QoS flow group is any QoS flow group in the QoS flow group which receives double broadcasting;

and the user plane network element sequentially allocates N3 sequence numbers for the downlink double-broadcast data packets of the first QoS flow group.
The method as recited in claim 11, further comprising:

and the user plane network element sends the downlink double-broadcast data packet of the first QoS flow group to source access network equipment and target access network equipment.
The method of claim 12, wherein,

the QoS flows in each QoS flow group in the QoS flow group receiving double broadcasting are associated with the same data radio bearer, and the QoS flows in different QoS flow groups are associated with different data radio bearers.
The method of claim 13 wherein the N3 sequence number is carried in downlink protocol data unit PDU session information in a downlink bi-cast data packet of the first QoS flow group.
A communication device, comprising:

The receiving and transmitting unit is used for receiving a first downlink double-broadcast data packet from the user plane network element, wherein the first downlink double-broadcast data packet carries first data and a first sequence number; sending a second downlink double-broadcast data packet to terminal equipment, wherein the second downlink double-broadcast data packet carries the first data and a PDCP sequence number of a first packet data convergence protocol;

and the processing unit is used for determining the first PDCP sequence number corresponding to the first sequence number.
The apparatus of claim 15, wherein the first sequence number is an N3 sequence number.
The apparatus according to claim 15 or 16, wherein the processing unit is specifically configured to:

determining a first PDCP COUNT value corresponding to the first sequence number;

and determining the first PDCP sequence number corresponding to the first PDCP COUNT value.
The apparatus according to any one of claims 15 to 17, wherein the transceiver unit is further configured to receive a third downlink bi-cast data packet from a user plane network element before receiving the first downlink bi-cast data packet from the user plane network element, the third downlink bi-cast data packet carrying the second data and the second sequence number;

the processing unit is further configured to determine a mapping relationship according to the second sequence number and a second PDCP sequence number corresponding to the third downlink dual-cast data packet, where the mapping relationship is used to determine the first PDCP sequence number corresponding to the first sequence number.
The apparatus of claim 18, wherein the transceiver unit is further configured to send indication information to a target access network device, the indication information being used to indicate the mapping relationship.
The apparatus of claim 19, wherein the device comprises a plurality of sensors,

the indication information carries the second sequence number and the second PDCP sequence number corresponding to the second sequence number; or,

the indication information carries the difference value between the second sequence number and the second PDCP sequence number; or,

the indication information carries a second PDCP COUNT value corresponding to the second sequence number and the second sequence number, and the second PDCP COUNT value corresponds to the second PDCP sequence number; or,

the indication information carries a difference value between the second sequence number and a second PDCP COUNT value, where the second PDCP COUNT value corresponds to the second PDCP sequence number.
The apparatus of any of claims 18 to 20, wherein the transceiver unit is further configured to:

a first request carries information of a quality of service (QoS) flow group requesting bi-casting from a first device, wherein the first device is a target access network device or a mobility management network element;

a first response from the first device is received, wherein the first response carries information of a QoS flow group accepting double broadcasting, and the QoS flow group accepting double broadcasting is part or all of the QoS flow group requesting double broadcasting.
The apparatus of any of claims 15 to 17, wherein the transceiver unit is further configured to:

and receiving indication information from source access network equipment, wherein the indication information is used for indicating a mapping relation, and the mapping relation is used for determining the first PDCP sequence number corresponding to the first sequence number.
The apparatus of claim 22, wherein the transceiver unit is further configured to receive information of a QoS flow group requesting bi-casting; transmitting information of QoS stream group for accepting double broadcasting to session management network element;

the processing unit is further configured to determine, according to the information of the QoS flow group requesting for the bicasting, information of the QoS flow group accepting for the bicasting.
The apparatus of claim 23, wherein the transceiver unit is specifically configured to:

receiving a switching request message from source access network equipment, wherein the switching request message carries information of the QoS stream group requesting double broadcasting; or,

and receiving a switching request message from the mobility management network element, wherein the switching request message carries the information of the QoS flow group requesting the double broadcasting.
A communication device, comprising:

a transceiver unit, configured to receive configuration information, where the configuration information carries information of a QoS flow group that accepts dual-casting, where the QoS flow group that accepts dual-casting includes one or more QoS flow groups, and a first QoS flow group is any QoS flow group in the QoS flow group that accepts dual-casting;

And the processing unit is used for sequentially distributing N3 sequence numbers to the downlink double-broadcast data packets of the first QoS flow group.
The apparatus of claim 25, wherein the transceiver unit is further configured to send downstream bi-cast data packets of the first QoS flow group to a source access network device and a target access network device.
The apparatus of claim 26, wherein the device comprises,

the QoS flows in each QoS flow group in the QoS flow group receiving double broadcasting are associated with the same data radio bearer, and the QoS flows in different QoS flow groups are associated with different data radio bearers.
The apparatus of claim 27, wherein the N3 sequence number is carried in downlink protocol data unit PDU session information in a downlink bi-cast data packet of the first QoS flow group.
A communication device, comprising: a processor coupled to a memory for storing a program or instructions that, when executed by the processor, cause the apparatus to perform the method of any one of claims 1 to 10.
A communication device, comprising: a processor coupled to a memory for storing a program or instructions that, when executed by the processor, cause the apparatus to perform the method of any of claims 11 to 14.
A communication device for performing the method of any of claims 1 to 10.
A communication device for performing the method of any of claims 11 to 14.
A communication system comprising a communication device according to any of claims 15-24, 29, 31 and a communication device according to any of claims 25-28, 30, 32.
A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of any of claims 1 to 14.
A computer program product comprising instructions which, when executed, implement the method of any one of claims 1 to 14.