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1. (WO2017040940) IMPROVED BLOCK TRANSFER OPERATION IN COAP PROTOCOL

Pub. No.:    WO/2017/040940    International Application No.:    PCT/US2016/050123
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 03 01:59:59 CEST 2016
IPC: H04L 1/18
H04L 29/08
H04W 4/00
H04L 29/06
Applicants: CONVIDA WIRELESS, LLC
Inventors: LI, Xu
DONG, Lijun
LY, Quang
CHEN, Zhuo
RAHMAN, Shamim, Akbar
LU, Guang
WANG, Chonggang
Title: IMPROVED BLOCK TRANSFER OPERATION IN COAP PROTOCOL
Abstract:
Modifications are made to the existing CoAP block transfer mechanism to minimize waste associated with excess load and congestion and excess message and block transfers during transfers of resources that are dynamically changing. In one aspect, a retransmission budget is introduced to limit the number of attempted message retransmissions. In another aspect, a retransmission time function is introduced to determine when to retransmit a message. In yet another aspect, two new Block Options are introduced to coordinate retransmission operations between the client and the server. Additionally, in an aspect, two new Block Options are introduced to indicate which range of blocks of a requested resource have changed since last retrieval. In another aspect, each block of a resource will have an associated ETag, and three new Block Options are introduced to indicate which specific blocks have changed since last retrieval.