9.1.30b COMPACT Synchronization channel information
3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS
This message is sent on the CSCH, which is one of the broadcast channels (ref. 3GPP TS 45.002). Its purpose is to support the synchronization of a COMPACT mobile station to a BSS. It does not follow the basic format. Its length is 25 bits. The order of bit transmission is defined in 3GPP TS 44.004. See figure 9.1.30b.1 and table 9.1.30b.1.
Message type: COMPACT SYNCHRONIZATION CHANNEL INFORMATION
Significance: dual
Direction: network to mobile station
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
BSIC |
R1 (high) |
octet 1 |
||||||
R1 (low) |
octet 2 |
|||||||
R2 |
TG |
octet 3 |
||||||
spare |
Figure 9.1.30b.1: COMPACT Frame synchronization information element
Table 9.1.30b.1: COMPACT Synchronization channel information message contents
BSIC, the base station identity code of the base station R1 and R2, the 2 parts of the reduced TDMA frame number (RFN) as specified in 3GPP TS 45.002. TG, the time group as specified in 3GPP TS 45.002. |