User's Manual

CHAPTER 2. System Overview

2-10

Call Trace Function

The SPI-2L10 supports the call trace function for a specific MS. The SPI-2L10 can carry

out the call trace function up to 10 MSs. If a call occurs in the MS that an operator

previously specified via ACR, the signaling message and statistical traffic data are

transmitted to WSM. Besides, the SPI-2L10, also, sends the RF environment information,

such as Carrier-to-Interference-and-Noise-Ratio (CINR) for MS, Modulation and Coding

Schemes (MCS) level and Burst Error Rate (BER).

Detailed Information for Each Session and Service Flow (PSMR/PSFMR)

The Mobile WiMAX system of Samsung collects and stores detailed information of all

sessions (Per Session Measurement Record, PSMR) and detailed information of all service

flows (Per Service Flow Measurement Record, PSFMR) to provide it to an external log

server. When a session or service flow is created, the Mobile WiMAX system starts to

collect relevant information, and when the session or service flow terminates, the system

creates and stores a message in a file so that the external log server can collect the message.

The information collected by the ACR includes session termination time, initial and final

handover information (handover types, cell information), and the MAC address and IP

address allocated to the MS. The SPI-2L10 collects such information as MS MAC

addresses, continued session time, continued service flow time, turnaround time for

network entry, CID, SFID, initial and final wireless quality information (RSSI, CINR, Tx

power), and throughput information.

The ACR deliver the information collected by ACR to the SPI-2L10, and the SPI-2L10

creates and stores a file for each period.

Threshold Cross Alert (TCA) Control

The SPI-2L10 defines under/over threshold for statistics. When a statistical value collected

at Bucket Interval (15, 30, and 60 minutes) is lower than the under threshold, it generates

an under TCA alarm. When the value is higher than the over threshold, it generates an over

TCA alarm. The alarms are reported to the WSM. TCA can enable or disable details of each

statistical group and set a threshold per severity.

IEEE 802.3ah

The SPI-2L10 provides IEEE 802.3ah Ethernet OAM for a backhaul interface.

Although IEEE 802.3ah OAM pertains the PHY layer, it is located in the MAC layer so

that it can be applied to all IEEE 802.3 PHYs. It creates or processes 802.3ah OAM frames

according to the functions defined in the specification.

Ethernet OAM continuously monitors the connection between links at each end, and also

monitors discovery, remote loopback, and error packets which deliver important link events

such as Dying Gasp. It also includes a link monitoring function which delivers event

notification in the event of threshold errors, and a variable retrieval function for 802.3ah

standard MIB.

The SPI-2L10 supports 802.3ah Ethernet OAM passive mode such as responding to

802.3ah OAM which is triggered in external active mode entities and loopback mode

operation, and sending event notification.