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1. 发明公开

EP0980615A1 PROVIDING RELIABLE COMMUNICATION OVER AN UNRELIABLE TRANSPORT LAYER IN A HAND-HELD DEVICE USING A PERSISTENT SESSION 失效
标题翻译：保密通信在不可靠层在便携式设备中采用恒定SESSION
公开(公告)号：EP0980615A1
公开(公告)日：2000-02-23
申请号：EP98920175.1
申请日：1998-05-04
申请人： Intermec Technologies Corporation
发明人： RENOUARD, Julia, J. , PIERCY, Alan , HECKT, Steve , SAVARESE, Joe
IPC分类号： H04L29/06
CPC分类号： H04L69/16 , H04L29/06 , H04L69/164 , H04L69/326
摘要： The disclosed system provides a UDP+ connection-oriented protocol layer that reliably communicates over the UDP transport layer in a hand-held device. By providing reliable communication over the UDP transport layer instead of using the TCP transport layer, memory requirements are reduced, and applications running on the hand-held device have reliable data transfers performed on their behalf. Additionally, the UDP+ layer is designed to communicate using a 'persistent session'. A persistent session is a mode of communication where, when a connection terminates, the data associated with the connection, including the packets that have not yet been transferred, is not discarded. Instead, in using a persistent session, UDP+ retains the data associated with a connection after it terminates, reestablishes the connection, and completes the data transfer. By performing such a persistent session, application programs using UDP+ do not need to retain a copy of the packets passed to UDP+, and the code of the application programs is simplified, because the application programs do not need to keep track of which packets were successfully transferred when the connection terminates.

2. 发明公开

EP0980614A1 RELIABLE COMMUNICATION OVER AN UNRELIABLE TRANSPORT LAYER IN A HAND-HELD DEVICE USING USER-CONFIGURABLE TIMERS 失效
标题翻译：保密通信在不可靠层中的便携设备下用户可配置的时间DONORS VREWENDUNG
公开(公告)号：EP0980614A1
公开(公告)日：2000-02-23
申请号：EP98920174.4
申请日：1998-05-04
申请人： Intermec Technologies Corporation
发明人： RENOUARD, Julia, J. , PIERCY, Alan , HECKT, Steve , SAVARESE, Joe
IPC分类号： H04L29/06
CPC分类号： H04L29/06 , H04L69/326
摘要： The disclosed system provides reliable communication over the UDP transport layer in a handheld device. By providing reliable communication over the UDP transport layer instead of using the TCP transport layer, memory requirements are reduced, and applications running on the handheld device have reliable data transfers performed on their behalf. Additionally, the use of standardized components, such as the UDP transport layer and a standard network layer like the IP layer, enables the handheld device to efficiently communicate with many other devices in a standardized manner. The disclosed system provides the reliable communication by utilizing a UDP+ layer on top of the UDP transport layer. The UDP+ layer acts as an interface between the application layer and the UDP layer both to provide reliable communication to the application layer and to hide the complexities involved with performing this functionality from the application layer. To provide reliable communication, the UDP+ layer acknowledges all messages received, and the UDP+ layer utilizes a retry timer such that when receipt of a message has not been acknowledged and the retry timer expires, the UDP+ layer resends the message. The value of the retry timer as well as other values used during retransmission of the message are configurable by the user to optimize performance. Also, the UDP+ layer utilizes a number of messages that are used to open a connection, transfer data, and close a connection.

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