6 Specific requirements
04.053GPPData Link (DL) Layer General AspectsRelease 1999TS
6.1 Mode of operation and allowed SAPIs
The various types of channels shall support SAPIs and modes of operation as follows:
Type of channel | SAPI = 0 | SAPI = 3 |
|---|---|---|
BCCH | Unacknowledged | Not supported |
CCCH | Unacknowledged | Not supported |
SDCCH | Unacknowledged and acknowledged | Acknowledged |
SACCH associated with SDCCH | Unacknowledged | Not Supported |
SACCH associated with TCH | Unacknowledged | Acknowledged |
FACCH | Unacknowledged and acknowledged | Not supported |
6.2 Acknowledged mode of operation
6.2.1 Window size
The window size, k (see 3GPP TS 04.06), shall be:
‑ for SAPI = O, k = 1;
‑ for SAPI = 3, k = 1.
Other SAPIs, for further study.
6.2.2 Processing capacity
The processing capacity of the MS and the network shall be big enough to avoid that the data link layer entities enter the receiver busy state for SAPI = 0.
Annex A (informative):
Change History
Meeting/Date | CR | Change | New version |
– | – | V7.1.0 | |
A001 | Addition of Preemption capability for SAPI 0 in LAPDm | – | |
– | Version update to 8.0.1 for Publication | V8.0.1 | |
May 2002 | – | Format changed to 3GPP TS style | 8.0.2 |