PTA Results and Observations#

PTA results were analyzed to evaluate the performance of the SiWG917 SoC in different configurations. Tests were conducted in a shielded room environment using the SiWG917 B0 2.0 BRD4338A SoC board. The analysis focused on the interaction between WLAN (acting as the PTA Main) and Zigbee (acting as the PTA Secondary), particularly when operating on overlapping channels.

Build

SiWx917 v3.4.0

SoC Board

B0 2.0 BRD4338A

WLAN (PTA Main) channel

1

Zigbee (PTA Secondary) channel

11

Bandwidth

20 MHz

Environment

Shield Room

Variant

SoC

Zigbee duty cycle

20%

ZB Tx interval

50 ms

ZB packet size

127 bytes

WLAN Tx + ZB PTA 3-Wire SoC Throughputs#

Area

UDP Tx (Mbps)

Wi-Fi alone

53.14

PTA Configuration

WLAN Tx (Mbps)

ZB Tx

ZB Packet Loss (%)

1

37.5

1200

0

2

36.85

1200

0

3

37.29

1200

0

PTA Configuration

WLAN Tx (Mbps)

ZB Tx

ZB Packet Loss (%)

1

40.09

1199

0.08

2

40.14

1196

0.3

3

40.03

1200

0

Note: Zigbee Packet loss is zero or less than 0.5% when PTA is enabled.

WLAN Rx + ZB PTA 3-Wire SoC Throughputs#

Area

UDP Rx (Mbps)

Wi-Fi alone

60.26

PTA Configuration

WLAN Tx (Mbps)

ZB Tx

ZB Packet Loss (%)

1

37.54

1148

4.33

2

38.94

1132

5.66

3

36.4

1189

0.92

PTA Configuration

WLAN Tx (Mbps)

ZB Tx

ZB Packet Loss (%)

1

40.32

1160

3.33

2

40.67

1156

3.66

3

37.03

1192

0.66

Note: Zigbee packet loss is expected during WLAN reception because the reception phase is not protected by the PTA mechanism.

The analysis of the PTA results indicates that the SiWG917 SoC performs well across different PTA configurations, with minimal Zigbee packet loss when PTA is enabled. However, during WLAN reception, Zigbee packet loss increases because the reception phase is not protected.