Nokia SERIES 30 Benutzerhandbuch

 

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2.3.4 Infrastructure 

optimization 

The latency between the WAP gateway and content server should be minimized. Each query traverses 

this link twice, once as a request and once as a response. 

The WAP gateway should be placed close to the GPRS gateway. (The GPRS gateway is technically called 

a  “Gateway  GPRS  Support  Node,”  or  GGSN.)  “Close”  in  this  instance  refers  to  both  latency  and  the 

probability of packet loss. Lost messages cause additional delays due to HTTP retransmission. 

2.4.1 Doormat 

pages 

It is not recommended to start the site using a doormat page, which serves no other purpose than to 

perhaps greet the visitor and display a logo. It is better if the user can go to the service directly.  

2.4.2 Login 

 

Entering login information can be time consuming with a mobile phone. Login information should be 

requested only once during the session, not each time after starting navigation from the main page.  

Case-sensitive checking of user names and passwords should be avoided. 

2.4.3 Detecting 

the 

browser 

When using a modern Web site hosting environment, it is possible to detect the browser as well as 

the language mode and supply the correct content transparently, without user interaction.  

The Nokia Series 30 mobile browser sends a user agent field in the WSP header to the WAP gateway 

when the content is fetched from the origin server. This user agent field can be used to define the type 

of browser and then build a logic on the origin server to serve suitable content. From the WAP 
gateway, it is then delivered inside the HTTP header. 

2.4.4 

Optimizing for size 

Interactive pages should be short; informative pages, long. Having pages that are too short and 

require many downloads is worse than having close-knit information on one longer page. In 

particular, interactive pages with forms should not be too long, as users start to lose their feeling of 

control if the form is more than two screenfuls. Empty rows can be misleading, as users may think 

there is no more content below. 

If, for example, a page contains a story or instructions, the entire content should be on one page. 
Subtitles that take the user to points within a page help when browsing long, informative pages. 

It is difficult to give hard and fast guidelines about how many links should be provided on one link list 

page. If the links clearly belong together and are easy to browse (one line per link, in alphabetical or 

other logical order), it is better to provide 30 links on one page than 5 links on six pages. 

As for the total downloading time, some studies place an upper limit for acceptable delay on a PC-

based browser at 10 to 15 seconds, including all images. It is highly recommended to have a response 

time (excluding connection time) of less than 10 seconds in a mobile environment.  

 

WAP Service Developer's Guide for Nokia Series 30 Phones with WML Browser

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