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XEP-0286: Fix some confusing paragraphs.
Add reference to CSI in Notable Extensions Undefer
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xep-0286.xml
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xep-0286.xml
@ -13,7 +13,7 @@
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</abstract>
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</abstract>
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&LEGALNOTICE;
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&LEGALNOTICE;
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<number>0286</number>
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<number>0286</number>
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<status>Deferred</status>
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<status>Experimental</status>
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<type>Informational</type>
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<type>Informational</type>
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<sig>Standards</sig>
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<sig>Standards</sig>
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<approver>Council</approver>
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<approver>Council</approver>
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@ -35,6 +35,17 @@
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<email>sam@samwhited.com</email>
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<email>sam@samwhited.com</email>
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<jid>sam@samwhited.com</jid>
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<jid>sam@samwhited.com</jid>
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</author>
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</author>
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<revision>
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<version>0.4.0</version>
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<date>2017-01-17</date>
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<initials>ssw</initials>
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<remark>
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<ul>
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<li>Attempt to fix some confusing paragraphs.</li>
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<li>Add Client State Indication to Notable Extensions.</li>
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</ul>
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</remark>
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</revision>
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<revision>
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<revision>
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<version>0.3</version>
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<version>0.3</version>
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<date>2015-07-24</date>
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<date>2015-07-24</date>
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@ -76,13 +87,13 @@
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</section1>
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</section1>
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<section1 topic='Overview' anchor='overview'>
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<section1 topic='Overview' anchor='overview'>
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<p>
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<p>
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The two major constraints on mobile devices are power and bandwidth. With
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The two major constraints on mobile devices are power and bandwidth.
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the wide spread proliferation of 3G and LTE technologies, mobile bandwidth
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With the wide spread proliferation of 3G and LTE technologies, mobile
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and speeds have become broadly comparable to broadband. However, they are
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bandwidth and speeds have become broadly comparable to broadband.
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still relatively expensive compared to traditional wired networks, and
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However, they are still relatively expensive compared to traditional wired
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should therefore still be considered. This XEP mostly focuses on LTE as it
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networks, and therefore conserving them is still desirable.
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already has a very wide deployment and will only continue to further
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This XEP mostly focuses on LTE as it already has a very wide deployment and
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replace 3G technologies.
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will only continue to further replace 3G technologies.
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</p>
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</p>
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</section1>
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</section1>
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@ -118,8 +129,8 @@
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other algorithms were not tested) should be considered negligable.
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other algorithms were not tested) should be considered negligable.
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</p>
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</p>
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<p>
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<p>
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Supporting compression and flushing on stanza boundaries is highly
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Supporting compression and performming a full flush on stanza boundaries is
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recommended.
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recommended for mobile devices.
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</p>
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</p>
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</section1>
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</section1>
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<section1 topic='Power Consumption' anchor='power'>
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<section1 topic='Power Consumption' anchor='power'>
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@ -156,39 +167,43 @@
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<section2 topic='Transmit no data'>
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<section2 topic='Transmit no data'>
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<p>
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<p>
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Whenever possible, data that is not strictly needed should not be
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Whenever possible, data that is not strictly needed should not be
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transmitted (by the server or client). Supporting &xep0352; is highly
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transmitted (by the server or client).
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recommended. Most importantly, XMPP pings should be kept as far apart as
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Supporting &xep0352; is recommended.
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possible and only used when necessary. Server operators are encouraged to
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Most importantly, XMPP pings should be kept as far apart as possible and
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set high ping timeouts, and client implementors are advised to only send
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only used when necessary.
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pings when absolutely necessary to prevent the server from closing the
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Server operators are encouraged to set high ping timeouts, and client
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socket.
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implementors are advised to only send pings when absolutely necessary to
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prevent the server from closing the socket.
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</p>
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</p>
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</section2>
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</section2>
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<section2 topic='Transmit as much data as you can at once'>
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<section2 topic='Transmit as much data as you can at once'>
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<p>
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<p>
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If one is on 3G, transmitting a small amount of data will cause the radio
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If one is on 3G, transmitting a small amount of data will cause the radio
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to enter FACH mode which is significantly cheaper than its high power
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to enter FACH mode which is significantly cheaper than its high power
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mode. On LTE radios, however, transmitting small amounts of data is
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mode.
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vastly more expensive per bit due to the significantly higher tail-times
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On LTE radios, however, transmitting small amounts of data is vastly more
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(the time it takes for the radio to change state). On LTE radios, one
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expensive per bit due to the higher tail-times (the time it takes for the
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should transmit as much data as possible when the radio is already on
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radio to change state).
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(eg. by placing messages in a send queue and executing the queue as a
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On LTE radios, one should transmit as much data from the client as
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batch). Similarly, when data is being received the radio is already in a
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possible when the radio is already on (eg. by placing messages in a send
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high power state and therefore any data that needs to be sent should be.
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queue and executing the queue as a batch when the radio is on).
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Similarly, when data is being received from the server, the mobile devices
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radio is already in a high power state and therefore any data that needs
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to be sent to the server should be transmitted.
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</p>
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</p>
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<p>
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<p>
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These rules also apply to server operators: If you receive data, the
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These rules also apply to server operators: If the server receives data,
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phones radio is already on therefore you should send anything you have.
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the phones radio is already on therefore you should send any pending data.
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Otherwise, batching data to be sent and sending it all at once (and as
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Batching data to be sent and sending it all at once will help reduce power
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much as possible) will help reduce power consumption.
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consumption.
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</p>
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</p>
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</section2>
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</section2>
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</section1>
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</section1>
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<section1 topic='Notable Extensions' anchor='xeps'>
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<section1 topic='Notable Extensions' anchor='xeps'>
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<p>
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<p>
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This section provides pointers to other documents which may be of interest
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This section provides pointers to other documents which may be of interest
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to those developing mobile clients, or considering support for them in
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to those developing mobile clients, or considering implementing
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servers.
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optimizations for them in servers.
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</p>
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</p>
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<p>&xep0138; provides stream level compression.</p>
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<p>&xep0138; provides stream level compression.</p>
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<p>&xep0322; allows XMPP streams to use the EXI XML format.</p>
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<p>&xep0322; allows XMPP streams to use the EXI XML format.</p>
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@ -201,15 +216,20 @@
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roster fetch sizes.
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roster fetch sizes.
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</p>
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</p>
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<p>
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<p>
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&xep0198; allows the client to send and receive smaller keep-alive
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&xep0198; allows the client to send and receive smaller keep-alive messages,
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messages, and resume existing sessions without the full handshake. Useful
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and resume existing sessions without the full handshake.
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on unstable connections.
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This is useful on unstable connections.
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</p>
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<p>
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&xep0352; allows clients to indicate to the server that they are inactive,
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allowing the server to optimize and reduce unnecessary traffic.
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</p>
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</p>
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<p>
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<p>
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&xep0357; implements push notifications (third party message delivery),
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&xep0357; implements push notifications (third party message delivery),
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which are often used on mobile devices and highly optimized to conserve
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which are often used on mobile devices and highly optimized to conserve
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battery. Push notifications also allow delivery of notifications to mobile
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battery.
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clients that are currently offline (eg. in an XEP-0198 "zombie" state).
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Push notifications also allow delivery of notifications to mobile clients
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that are currently offline (eg. in an XEP-0198 "zombie" state).
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</p>
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</p>
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<p>
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<p>
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&xep0313; lets clients fetch messages which they missed (eg. due to poor
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&xep0313; lets clients fetch messages which they missed (eg. due to poor
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@ -219,8 +239,9 @@
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<section1 topic='Acknowledgements' anchor='acks'>
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<section1 topic='Acknowledgements' anchor='acks'>
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<p>
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<p>
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This XEP was originally written by Dave Cridland, and parts of his original
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This XEP was originally written by Dave Cridland, and parts of his original
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work were used in this rewrite. Thanks to Atlassian for allowing me to
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work were used in this rewrite.
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release hard numbers from their XMPP compression deployment.
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Thanks to Atlassian for allowing me to release hard numbers from their XMPP
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compression deployment.
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</p>
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</p>
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</section1>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<section1 topic='Security Considerations' anchor='security'>
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