9.1.30a Synchronization channel information
3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS
This message is sent on the SCH, which is one of the broadcast channels (ref. 3GPP TS 45.002). Its purpose is to support the synchronization of a 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 9.1.30a.1 and table 9.1.30a.1.
Message type: SYNCHRONIZATION CHANNEL INFORMATION
Significance: dual
Direction: network to mobile station
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8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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BSIC |
T1 (high) |
octet 1 |
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T1 (middle) |
octet 2 |
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T1 |
T2 |
T3′ |
octet 3 |
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T3′ |
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Figure 9.1.30a.1: Frame synchronization information element
Table 9.1.30a.1: Synchronization channel information message contents
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BSIC, the base station identity code of the base station T1, T2 and T3′, the 3 parts of the reduced TDMA frame number (RFN) as specified in 3GPP TS 45.002. |