User Manual

Abstract

This document describes the use of DDPS of the DA16200 (DA16600).

Contents

1. Terms and Definitions
2. References
3. Introduction
4. Operation Scenario
5. Enable DDPS
6. BUFP
1. BUFP State Diagram
2. When DDPS Changes the Sleep Time to 1 Second
7. AP Test Report for DDPS

Figures

Figure 1: DDPS BUFP Block Diagram

Tables

Table 1: BUFP Main States

Table 2: DDPS Result

1 Terms and Definitions

• DPM: Dynamic Power save Module
• DDPS: DPM Dynamic Period Setting
• BSS: Basic Service Set
• AP: Access Point
• SSID: Service Set Identifier
• RTOS: Real Time Operating System
• TIM: Traffic Indicator Module
• BUFP: Buffering Probe
• UC: Unicast Packet

2 References

1. UM-WI-023, DA16200 EVK User Manual, Dialog Semiconductor.

3 Introduction

The DA16200 (DA16600) has a DPM Dynamic Period Setting (DDPS) function.

Access Points (AP) with WiFi BSS (Basic Server Set) support a power save option in the communication with each station. To support the power save functionality of a station, communication packets must be maintained when a station is in power save state. How long and how many packets the AP must keep for stations that are in a power save state plays an important role in the communication of the DA16200 (DA16600) Dynamic Power save Module (DPM). DDPS is the operation algorithm that checks what the buffering time must be for the DPM operation of the AP in the DA16200 (DA16600) station. To select the optimal TIM wake up period (interval) for a DPM operation, DDPS calculates the buffer size and time difference for the AP buffering time.

4 Operation Scenario

The DDPS configuration and operation has the following sequence.

1. The AP WiFi configuration is set with the setup console command, or via Provisioning. A WiFi configuration consist of AP SSID, Password, and network configuration.
2. DDPS in a WiFi configuration is enabled when DDPS is enabled in the setup console command, or when provisioned after a POR / RESET / REBOOT.
3. If DDPS is enabled at the time of the DPM setup, and connects to the first AP, then DDPS starts triggering in DPM state and enters DPM.
4. When in DPM state, TIM SW operates the DDPS.
5. When DDPS execution is completed and TIM SW wakes up the RTOS SW, RTOS is booted.
6. RTOS SW compares the value of the checking period with the rx beacon max count and the checking Probe count condition in the DDPS Check routine.
   1. If DDPS Check condition is satisfied, then the Tim Wakeup Interval is set to 3 seconds.
   2. If the DDPS Check condition is not satisfied, then the DPM interval set to 1 second.
7. DDPS is terminated as well as DPM and related operating services.

5 Enable DDPS

To enable and use DDPS, there are two methods:

• To use Provisioning
• To use the setup console command

To use the provisioning method, please contact our sales and assistant engineer.

To enable DDPS via the console, use the command setup. In that case, DDPS will operate automatically. For more information on the setup console command, see the DA16200 (DA16600) EVK User Manual [1].

Dialog DPM (Dynamic Power Management) ? [Yes/No/Quit] : y
DPM factors : Defaults ? [Yes/No/Quit] : n
DDPS Enable : Default ? [No/Yes/Quit] : y
DPM Keep Alive Time(0~600000 ms) ? [Quit] (Default 30000 ms) :
DPM User Wakeup Time(0~86400 Sec.) ? [Quit] (Default 0 Sec.) :
DPM TIM Wakeup Count(1~65535 dtim) ? [Quit) (Default 10) :
DPM MODE : Enable

Dynamic Period Set : Enable

Keep Alive Time : 30000 ms

User Wakeup Time : 0 sec.

TIM Wakeup Count : 10 dtim

DPM CONFIGURATION CONFIRM ? [Yes/No/Quit] : y

6 BUFP

The buffering probe (BUFP) state starts when DDPS is enabled and RTOS goes to sleep state. Figure 1 shows the state change during BUFP.

6.1 BUFP State Diagram

A diagram illustrating the BUFP state transitions. It shows states like ARPREQ, PROBE, UCHK, BUFP_SUCCESS, BUFP_FAILURE, BUFP_ERROR, and transitions based on conditions like ARPREQ TX Success, ARPREQ TX Failure, Beacon loss, Buffering Check Timeout, UC signal cleared, Max ARPREQ Retry, and Max Probe Retry.

Figure 1: DDPS BUFP Block Diagram

Table 1: BUFP Main States

6.2 When DDPS Changes the Sleep Time to 1 Second

When the BUFP fails 4 out of 5 times, DDPS estimates that the AP's UC buffering time is less than 3 seconds, and changes the sleep time to 1 second.

7 AP Test Report for DDPS

Table 2 shows the test results for each tested AP model on the DDPS functionality. Each AP was tested 100 times.

Table 2: DDPS Result

Revision History

Status Definitions

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