RE: Issue 136 - SOAP-over-UDP - UNICAST_UDP_REPEAT andMULTICAST_UDP

Please find a proposed resolution [1]. Changes are highlighted.

Two key changes:

· Added text indicating the constant values are non-normative.

· The algorithmic flow has been adjusted to use the constant values to keep count only of retransmissions.

· The value for UNICAST_UDP_REPEAT is set to 1 and MULTICAST_UDP_REPEAT is set to 2.

[1] Proposed resolution

A. Appendix (non-normative) — Example retransmission algorithm

Constants referenced within the algorithm are defined in Table 1 (for unicast messages) and Table 2 (for unreliable multicast messages). The value of those constants (as defined in Table 1 and Table 2) is non-normative. Implementations and other specifications may override the value of those constants.

Retry and back-off algorithm.

1. Transmit;

1. if *_UDP_REPEAT <= 0 go to Step 11;

2. else *_UDP_REPEAT--;

3. Generate a random number T in [UDP_MIN_DELAY .. UDP_MAX_DELAY];

4. Wait T milliseconds;

5. Retransmit;

6. if *_UDP_REPEAT <= 0 goto Step 11;

7. else *_UDP_REPEAT--;

8. T = T * 2;If T > UDP_UPPER_DELAY then T = UDP_UPPER_DELAY;

9. go to 5

10. Done.

Table 1: Protocol Retry and back-off constants for unicast messages

Constant / Message	Value
UNICAST_UDP_REPEAT	1
UDP_MIN_DELAY	50
UDP_MAX_DELAY	250
UDP_UPPER_DELAY	500

Table 2: Protocol Retry and back-off constants for unreliable multicast messages

Constant / Message	Value
MULTICAST_UDP_REPEAT	2
UDP_MIN_DELAY	50
UDP_MAX_DELAY	250
UDP_UPPER_DELAY	500

From: Ram Jeyaraman [mailto:Ram.Jeyaraman@microsoft.com]
Sent: Tuesday, December 16, 2008 9:29 AM
To: ws-dd@lists.oasis-open.org
Subject: [ws-dd] Issue 136 - SOAP-over-UDP - UNICAST_UDP_REPEAT and MULTICAST_UDP_REPEAT constant values

This issue is assigned the number 136. For further discussions on this issue, please refer to this issue number or use this thread.

Document: SOAP-over-UDP WS-02

Suggested change:

Update UNICAST_UDP_REPEAT and MULTICAST_UDP_REPEAT constant values to 1 and 2 respectively. Further, add text saying that higher-layer specs need to be intelligent about what they choose.

ws-dd message