Download - Ogdc 2013 network stragegy for mmo game

Network Strategy for MMO Game

Trần Như Toàn , Lead Software

Engineer,

Game Studio North , VNG Corporation

Who Am I ?Technical Leader

myPlay Game Portal

myPlay Mobile

Problems

This topic suite for

Turn-based, Real-time MMO Games

Network Game Developers

MMO Mobile Games

Agenda

11

22

33Common Problems

Disconnection

Lag

1. Lag

35% Game Client

(un-trusted , multitasking)

35% Game Servers (Overloaded ,Costly)

30% Network

(latency , bandwidth)

Effective Protocol

Packet Optimization

Data Protocol

Combination

Compress

Data Transfer Protocol

Combination & Compress

myPlay Results

OLD

Traffic of 3200 CCU:

In: 1,53 KB/s

Out: 325,08 KB/s

NỘI DUNG

11

22

33Common Problems

Disconnection

Lag

Slow Connection Disconnection

2. Disconnection

Maintain connection until time-out

Slow Connection

• Use session for each

connection

• Hold connection state in

session

• Activate connection when

having any signal

myPlay before

Slow Connection

Disconnection

Why ???

• Interrupted, even temporarily

• ISP might have intermittent

issues , router fail

• Drop in the strength of the

signal

Solutions

Disconnect protection Re-connection

Re-connection

Automatically reconnectwhen connection is lost

Remain user’s state

Game flow is not interrupted

Auto - Reconnection System

Session

Game Client

State

Data

New Connection

Priority Message Queue


Game flow is not interrupted

Client games auto-reconnect when connection lost

Remain state of User

The complexity of the reconnection is hidden from the developers.


Result

NỘI DUNG

11

22

33Common Problems

Disconnection

Lag

Ghost User

3. Common Problems

Firewall

Firewall

Block Game Port

Http Tunnel by-pass Firewall

Http Tunnel

Ghost Users

Incomplete TCP disconnection occurs (e.g. disable 3g, wifi ….)

Why?How to deal with ghosts?

Ghost User Hunter

Reduce the impact of pending connections

• Create scheduled task (called Ghost Hunter)

• Check the integrity of each connection

• Remove those that are stale

Summary

Choose right protocol

Optimize packet

Lag

Reduce Slow Connection

Use Auto-reconnecting

system

Happy Gaming