# US 11,910,227 B2 · Data transmission method and terminal device

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- Number: US 11,910,227 B2
- Document ID: US11910227B2
- Status: Granted
- Kind: B2
- Application number: 17/205,996
- Filed: 2021-03-18
- Published: 2021-08-19
- Granted: 2024-02-20
- Earliest claimed: 2018-09-21
- Assignees: Vivo Mobile Communication Co., Ltd.
- Applicants: Vivo Mobile Communication Co., Ltd.
- Inventors: Yumin Wu
- Web page: https://patentgrep.com/patent/US11910227B2

## CPC

- H04L 69/08: Protocols for interworking; Protocol conversion
- H04L 69/18: Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
- H04L 69/321: Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
- H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
- H04W 28/0263: {involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]}
- H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)}
- H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)}
- H04W 80/02: Data link layer protocols
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- H04W 92/10: between terminal device and access point, i.e. wireless air interface
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present disclosure provides a data transmission method and a terminal device. The data transmission method includes: obtaining interface information of an external device communication protocol and a 3GPP network protocol; and receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network.

## Claims

### Claim 1

A data transmission method, performed by a terminal device, and comprising:
obtaining, by the terminal device, interface information of an external device communication protocol and a 3rd-generation partnership project 3GPP network protocol; and
receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network;
wherein the data transmission method further comprises at least one of the following items (I)-(VIII):
(I) wherein the interface information comprises at least one of the following:
a media access control (MAC) protocol data unit (PDU) of the external device communication protocol is used as a packet data convergence protocol (PDCP) service data unit (SDU) of a first network protocol to receive or send the data;
a data radio bearer (DRB) identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an evolved packet system (EPS) bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a MAC layer entity of the external device communication protocol stack, a MAC PDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by a MAC layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(II) wherein the interface information comprises at least one of the following:
a MAC PDU of the external device communication protocol is used as a service data adaptation protocol (SDAP) SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a quality of service (QoS) flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a MAC layer entity of the external device communication protocol stack, a MAC PDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by a MAC layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(III) wherein the interface information comprises at least one of the following:
a physical layer (PHY) SDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a PHY layer entity of the external device communication protocol stack, a PHY SDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by a PHY layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(IV) wherein the interface information comprises at least one of the following:
a PHY SDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a PHY layer entity of the external device communication protocol stack, a PHY SDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by a PHY layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(V) wherein the interface information comprises at least one of the following:
an internet protocol (IP) PDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an IP layer entity of the external device communication protocol stack, an IP PDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by an IP layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(VI) wherein the interface information comprises at least one of the following:
an IP PDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an IP layer entity of the external device communication protocol stack, an IP PDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by an IP layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(VII) wherein the interface information comprises at least one of the following:
a robust header compression (ROHC) SDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an ROHC layer entity of the external device communication protocol stack, an ROHC SDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by an ROHC layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(VIII) wherein the interface information comprises at least one of the following:
an ROHC SDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an ROHC layer entity of the external device communication protocol stack, an ROHC SDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by an ROHC layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the external device communication protocol comprises any one of the following:
a wireless fidelity WiFi communication protocol;
a bluetooth protocol; or
a wired local area network communication protocol.

### Claim 3

A terminal device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the computer program is executed by the processor to perform steps of:
obtaining interface information of an external device communication protocol and a 3rd-generation partnership project 3GPP network protocol; and
receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network;
wherein the computer program is executed by the processor to perform at least one of the following items (I)-(VIII):
(I) wherein the interface information comprises at least one of the following:
a media access control (MAC) protocol data unit (PDU) of the external device communication protocol is used as a packet data convergence protocol (PDCP) service data unit (SDU) of a first network protocol to receive or send the data;
a data radio bearer (DRB) identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an evolved packet system (EPS) bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a MAC layer entity of the external device communication protocol stack, a MAC PDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by a MAC layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(II) wherein the interface information comprises at least one of the following:
a MAC PDU of the external device communication protocol is used as a service data adaptation protocol (SDAP) SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a quality of service (QoS) flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a MAC layer entity of the external device communication protocol stack, a MAC PDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by a MAC layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(III) wherein the interface information comprises at least one of the following:
a physical layer (PHY) SDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a PHY layer entity of the external device communication protocol stack, a PHY SDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by a PHY layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(IV) wherein the interface information comprises at least one of the following:
a PHY SDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a PHY layer entity of the external device communication protocol stack, a PHY SDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by a PHY layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(V) wherein the interface information comprises at least one of the following:
an internet protocol (IP) PDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an IP layer entity of the external device communication protocol stack, an IP PDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by an IP layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(VI) wherein the interface information comprises at least one of the following:
an IP PDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an IP layer entity of the external device communication protocol stack, an IP PDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by an IP layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(VII) wherein the interface information comprises at least one of the following:
a robust header compression (ROHC) SDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an ROHC layer entity of the external device communication protocol stack, an ROHC SDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by an ROHC layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(VIII) wherein the interface information comprises at least one of the following:
an ROHC SDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an ROHC layer entity of the external device communication protocol stack, an ROHC SDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by an ROHC layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack.

### Claim 4 (depends on 3)

The terminal device according to claim 3, wherein the external device communication protocol comprises any one of the following:
a wireless fidelity WiFi communication protocol;
a bluetooth protocol; or
a wired local area network communication protocol.

### Claim 5

A computer-readable storage medium, storing a computer program, wherein the computer program is executed by a processor to perform steps of:
obtaining interface information of an external device communication protocol and a 3rd-generation partnership project 3GPP network protocol; and
receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network;
wherein the computer program is executed by the processor to perform at least one of the following items (I)-(VIII):
(I) wherein the interface information comprises at least one of the following:
a media access control (MAC) protocol data unit (PDU) of the external device communication protocol is used as a packet data convergence protocol (PDCP) service data unit (SDU) of a first network protocol to receive or send the data;
a data radio bearer (DRB) identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an evolved packet system (EPS) bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a MAC layer entity of the external device communication protocol stack, a MAC PDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by a MAC layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(II) wherein the interface information comprises at least one of the following:
a MAC PDU of the external device communication protocol is used as a service data adaptation protocol (SDAP) SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a quality of service (QoS) flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a MAC layer entity of the external device communication protocol stack, a MAC PDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by a MAC layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(III) wherein the interface information comprises at least one of the following:
a physical layer (PHY) SDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a PHY layer entity of the external device communication protocol stack, a PHY SDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by a PHY layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(IV) wherein the interface information comprises at least one of the following:
a PHY SDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by a PHY layer entity of the external device communication protocol stack, a PHY SDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by a PHY layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(V) wherein the interface information comprises at least one of the following:
an internet protocol (IP) PDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an IP layer entity of the external device communication protocol stack, an IP PDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by an IP layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(VI) wherein the interface information comprises at least one of the following:
an IP PDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an IP layer entity of the external device communication protocol stack, an IP PDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by an IP layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack;
(VII) wherein the interface information comprises at least one of the following:
a robust header compression (ROHC) SDU of the external device communication protocol is used as a PDCP SDU of a first network protocol to receive or send the data;
a DRB identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol;
an EPS bearer identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; or
a PDCP entity identifier of a first network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an ROHC layer entity of the external device communication protocol stack, an ROHC SDU to a PDCP layer entity of a first network protocol stack; or,
receiving, by an ROHC layer entity of the external device communication protocol stack, a PDCP SDU sent by a PDCP layer entity of a first network protocol stack;
(VIII) wherein the interface information comprises at least one of the following:
an ROHC SDU of the external device communication protocol is used as an SDAP SDU of a second network protocol to receive or send the data;
a DRB identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a PDU session identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol;
a QoS flow identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; or
an SDAP entity identifier of a second network protocol corresponding to data or a data flow of the external device communication protocol; and
the receiving or sending, by a first protocol entity of an external device communication protocol stack, data according to the interface information through a second protocol entity of an air interface protocol stack of a 3GPP network comprises at least one of:
sending, by an ROHC layer entity of the external device communication protocol stack, an ROHC SDU to an SDAP layer entity of a second network protocol stack; or,
receiving, by an ROHC layer entity of the external device communication protocol stack, an SDAP SDU sent by an SDAP layer entity of a second network protocol stack.

### Claim 6 (depends on 5)

The computer-readable storage medium according to claim 5, wherein the external device communication protocol comprises any one of the following:
a wireless fidelity WiFi communication protocol;
a bluetooth protocol; or
a wired local area network communication protocol.