Data transmission method and system, and apparatus

• US 11,528,345 B2
• Filed: 12/30/2019
• Issued: 12/13/2022
• Est. Priority Date: 06/30/2017
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhou, Xingwang, Wang, Weiguang
• Primary Examiner(s): Chowdhury, Sharmin
• Application Number:
  US16/730,842
• Publication Number:
  US 20200137203A1
• Time in Patent Office: 1,079 Days
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0023 characterised by the signalling
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 65/40 Support for services or applications
• CPC Class Codes: H04L 67/141 Setup of application sessions admission control or resource allocation in data switching networks H04L47/70
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures
• CPC Class Codes: H04L 69/321 Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06
• CPC Class Codes: H04W 76/19 Connection re-establishment

Abstract

This application provides a data transmission method and system, an apparatus, and belongs to the field of communications technologies. The method is applied to a terminal, a wireless link is established between the terminal and an access control point device, a transmission control protocol (TCP) connection is established between the terminal and a server, and the wireless link is used to bear the TCP connection. The method includes: determining, by the terminal, link state information of the wireless link by using a link layer, and sending the link state information from the link layer to a transport layer. The method also includes: sending, by the terminal to the server by using the transport layer, a link notification corresponding to the link state information. In this application, data transmission efficiency can be improved.

Claims

1. A data transmission method, the method comprising:

establishing a wireless link between a terminal and an access control point device, wherein the access control point device is configured to periodically transmit beacon frames to the terminal via the wireless link in accordance with a preset period;

determining, by a link layer of the terminal, link state information of the wireless link, wherein the determining the link state information of the wireless link comprises;

receiving, by the terminal, at least one beacon frame sent by the access control point device indicating that the wireless link is connected,

determining that the wireless link is subsequently disconnected responsive to;

determining that a duration between a current time and a previous time that the terminal device received the most recent beacon frame sent by the access control point exceeds a preset duration threshold, or determining that the terminal has not received a beacon frame sent by the access control point in N consecutive preset periods, where N is a positive integer,

determining that the wireless link is subsequently reconnected after being disconnected responsive to receiving a subsequent beacon frame sent by the access control point, and

determining, responsive to determining that the wireless link is subsequently reconnected, the link state information based on a signal strength of a signal used for receiving the beacon frame;

sending, responsive to determining that the wireless link is subsequently reconnected, the link state information from the link layer to a transport layer; and

sending, by the terminal to a server using the transport layer, a link notification corresponding to the link state information, wherein the link notification is carried in an extension field of an acknowledgement (ACK) packet, and wherein the extension field comprises a TCP Option included in a TCP header of the ACK packet.

2. The method according to claim 1, wherein an acknowledgement number of the ACK packet is a sequence number of a data packet that the terminal expects to receive from the server.

3. The method according to claim 1, wherein the link state information comprises one or more types of a signal level, a link quality, or a link bit rate.

4. A data transmission method, the method comprising:

receiving, by a server using a transport layer, a link notification corresponding to link state information of a wireless link established between a terminal and an access control point device, wherein the link notification is sent to the server by the terminal via a transmission control protocol (TCP) connection established between the server and the terminal, wherein the link notification is carried in an extension field of an acknowledgement (ACK) packet, and wherein the extension field comprises a TCP Option included in a TCP header of the ACK packet; and

performing, by the server, data transmission management on the TCP connection based on the link notification,

wherein the link state information comprises a signal level, a link quality, and a link bit rate; and

the performing comprises;

adjusting, by the server based on the link notification, a transmission rate for transmitting data to the terminal based on a weighted calculation involving the signal level, the link quality, and the link bit rate.

5. The method according to claim 4, wherein the link notification notifies the server that the wireless link is reconnected;

and the performing comprises;

obtaining, by the server, a to-be-retransmitted data packet corresponding to the terminal, and

sending the to-be-retransmitted data packet to the terminal.

6. A terminal, comprising:

a receiver;

a processor configured to;

establish a wireless link between the terminal and an access control point device, wherein the access control point device is configured to periodically transmit beacon frames to the terminal via the wireless link in accordance with a preset period,

determine link state information of the wireless link using a link layer by;

receiving, at the receiver, at least one beacon frame sent by the access control point device indicating that the wireless link is connected,

determining that the wireless link is subsequently disconnected responsive to;

determining that a duration between a current time and a previous time that the terminal device received the most recent beacon frame sent by the access control point exceeds a preset duration threshold, or determining that the terminal has not received a beacon frame sent by the access control point in N consecutive preset periods, where N is a positive integer,

determining that the wireless link is subsequently reconnected after being disconnected responsive to receiving a subsequent beacon frame sent by the access control point, and

determining, responsive to determining that the wireless link is subsequently reconnected, the link state information based on a signal strength of a signal used for receiving the beacon frame, and

send, responsive to determining that the wireless link is subsequently reconnected, the link state information from the link layer to a transport layer; and

a transmitter configured to;

send, to a server using the transport layer, a link notification corresponding to the link state information, wherein the link notification is carried in an extension field of an acknowledgement (ACK) packet, and wherein the extension field comprises a TCP Option included in a TCP header of the ACK packet.

7. The terminal according to claim 6, wherein an acknowledgement number of the ACK packet is a sequence number of a data packet that the terminal expects to receive from the server.

8. The terminal according to claim 6, wherein the link state information comprises one or more types of a signal level, a link quality, and a link bit rate.