LLC Tab

When you configure a UMTS test case for Gb interface testing by selecting the GPRS protocol stack, the Gb tab is displayed. With it, you can define the SUT, the BSS link rates, and the transport protocol attributes for the RAN side of the Gb interface.

This topic describes the Gb interface settings. The topics listed under Related Parameters describe the other settings used in the UMTS test case.

Logical Link Control settings define the Service Access Points supported by the BSS nodes and the link management timers.

- XID Settings (SAPI grid)

XID Settings

Use the grid to specify the negotiable parameters for each Service Access Point Identifier (SAPI) supported by the BSS nodes. These values will be included in Exchange Identification (XID) commands sent to the SGSN. The grid is initialized with the 3GPP recommended defaults.

SAPI	Provision the parameters by entering values in the rows corresponding to the appropriate SAPI: 1 — GMM (LLGMM) 3 — User data 3 (LL3) 5 — User data 5 (LL5) 9 — User data 9 (LL9) 11 — User data 11 (LL11)
T200	Re-transmission timeout, in seconds, for LLC command messages. Range: 1 — 4095
T201	Re-transmission timeout, in seconds, for Information transfer messages. Range: 1 — 4095
N200	Maximum number of re-transmissions. Range: 1 — 15
N201U	Maximum information field length, in octets, for Unnumbered and Unconfirmed Information frames. Range: 140 — 1520 (400 — 1520 for SAPI 1)
N201I	Maximum information field length, in octets, for Information transfer frames. Range: 140 — 1520
mD	Downlink buffer size, in octets, for Information transfer frames. Range: 0, 9 — 24320
mU	Uplink buffer size, in octets, for Information transfer frames. Range: 0, 9 — 24320
kD	The maximum number of frames in the downlink window size. Range: 1 — 255
kU	The maximum number of frames in the uplink window size. Range: 1 — 255

Enable XID Negotiation

In UMTS and SGSN Node test case select to include a list of LLC parameters in the XID Request and XID response message.

Tcl Parameter: XidNegotiateEn_1

^ Back to Top