Data compression for communications signalling

Patent metadata

Field	Value
Publication number	US-10893076-B2
Application number	US-201816219296-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Dec 3, 2015
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A communication event is established between an initiating device and a responding device under the control of a remote communications controller. In a pre-session establishment phase: a compression dictionary or a dictionary link that identifies an addressable memory location, at which a compression dictionary is held, is received at the initiating device. The received compression dictionary or the received dictionary link is stored in electronic storage of the initiating device. In response to a communication event establishment instruction received at the initiating device after the dictionary or the dictionary link has been received and stored at the initiating device, a session is established between the initiating device and the communications controller by the initiating device transmitting an initial session establishment message—compressed using the dictionary—to the communications controller to establish the communication event.

First claim

The invention claimed is:

1. A method, implemented in a first device, for establishing a communication session between the first device and a second device, the method comprising:
receiving data compression information before establishing the communication session;
generating a plaintext session request to initiate the communication session with the second device;
compressing the plaintext session request using the data compression information by applying a data compression function, corresponding to the data compression information, to the plaintext session request to generate a compressed session request;
transmitting the compressed session request;
receiving a session response to the compressed session request; and
establishing the communication session based on the session response.

2. The method of claim 1 , wherein:
receiving the data compression information includes receiving a compression dictionary from a dictionary server; and
compressing the session request includes replacing data strings in the session request with compressed data strings according to the compression dictionary.

3. The method of claim 1 , wherein:
receiving the data compression information includes receiving a link to a compression dictionary; and
compressing the session request includes:
accessing the compression dictionary via the link to compress the session request; and
replacing data strings in the session request with compressed data strings according to the compression dictionary.

4. The method of claim 1 , wherein:
compressing the session request includes compressing the session request to fit into a single packet; and
transmitting the compressed session request includes transmitting multiple copies of the single packet including the compressed session request using a first transport protocol.

5. The method of claim 4 , further comprising:
setting a timer for receiving a provisional response to the compressed session request, the provisional response acknowledging receipt of the compressed session request; and
responsive to the timer expiring before receipt of the provisional response, transmitting the session request using a second transport protocol;
wherein the establishing of the communication session includes establishing the communication session using the second transport protocol.

6. The method of claim 4 , further comprising:
setting a first timer for receiving a provisional response to the compressed session request and a second timer for receiving the session response, the provisional response acknowledging receipt of the compressed session request; and
responsive to receiving the provisional response before expiration of the first timer and not receiving the session response before expiration of the second timer, transmitting the session request using a second transport protocol;
wherein the establishing of the communication session includes establishing the communication session using the second transport protocol.

7. The method of claim 1 , further comprising:
receiving a session key;
encrypting the compressed session request with the session key prior to transmission; and
decrypting the session response using the session key before establishing the communication session based on the session response.

8. The method of claim 7 , wherein receiving the session key includes:
establishing a secure connection with a session key server;
receiving the session key via the secure connection; and
terminating the secure connection after receiving the session key.

9. The method of claim 7 , wherein:
receiving the session key includes receiving an encryption key;
receiving the session key encrypted with the encryption key; and
decrypting the session key using the encryption key.

10. The method of claim 9 , wherein transmitting the compressed session request includes encrypting the session key with the encryption key and transmitting the encrypted session key with the compressed session request.

11. An apparatus in a first device for establishing a communication session between the first device and a second device, the apparatus comprising:
a network interface for exchanging data between the first device and the second device;
a memory including instructions; and
a processor, coupled to the memory and the network interface, the processor being configured by the instructions to:
receive data compression information before establishing the communication session;
generate a plaintext session request to initiate the communication session with the second device;
compress the plaintext session request using the data compression information by applying a data compression function, corresponding to the data compression information, to the plaintext session request to generate a compressed session request;
transmit the compressed session request;
receive a session response to the compressed session request; and
establish the communication session based on the session response.

12. The apparatus of claim 11 , wherein the processor is configured by the instructions to:
receive a compression dictionary from a dictionary server as the data compression information; and
replace data strings in the session request with compressed data strings according to the compression dictionary to compress the session request.

13. The apparatus of claim 11 , wherein the processor is configured by the instructions to:
receive a link to a compression dictionary as the data compression information;
access the compression dictionary via the link; and
replace data strings in the session request with compressed data strings according to the compression dictionary to compress the session request.

14. The apparatus of claim 11 , wherein the processor is configured by the instructions to:
compress the session request to fit into a single packet; and
transmit multiple copies of the single packet including the compressed session request using a first transport protocol to transmit the compressed session request.

15. The apparatus of claim 14 , wherein the processor is configured by the instructions to:
set a timer for receiving a provisional response to the compressed session request, the provisional response acknowledging receipt of the compressed session request; and
responsive to the timer expiring before receipt of the provisional response, transmit the session request using a second transport protocol;
wherein the processor is configured by the instructions to establish the communication session using the second transport protocol.

16. The apparatus of claim 14 , wherein the processor is configured by the instructions to:
set a first timer for receiving a provisional response to the compressed session request and a second timer for receiving the session response, the provisional response acknowledging receipt of the compressed session request; and
responsive to receiving the provisional response before expiration of the first timer and not receiving the session response before expiration of the second timer, transmit the session request using a second transport protocol;
wherein the processor is configured by the instructions to establish the communication session using the second transport protocol.

17. An apparatus for establishing a communication session between a first device and a second device, the apparatus comprising:
means for receiving data compression information before establishing the communication session;
means for generating a plaintext session request to initiate the communication session with the second device;
means

Assignees

• Microsoft Technology Licensing Llc

Inventors

• Skuratovich Uladzimir A
• Kumar Namendra
• Belenko Andrey
• Moore Timothy Mark

Classifications

• H04L67/5651

  Reducing the amount or size of exchanged application data · CPC title

• H04L65/1104

  Session initiation protocol [SIP] · CPC title

• H04L65/762

  at the source  (reformatting of additional data in video distribution servers H04N21/2355) · CPC title

• H04L69/04

  Protocols for data compression, e.g. ROHC · CPC title

• H04L65/1069 Primary

  Session establishment or de-establishment · CPC title