9.1.45 Uplink access
3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS
This message is sent in random mode on the voice group call channel uplink. It does not follow the basic format. The possible formats are presented directly below, without reference to information fields. The order of bit transmission is defined in 3GPP TS 44.004.
The message is only one octet long, coded as shown in figure 9.1.45.1 and table 9.1.45.1.
Figure 9.1.45.1: UPLINK ACCESS message content
ESTABLISHMENT CAUSE (octet 1)
This information field indicates the reason for requesting the establishment of a connection. This field has a variable length (from 3 bits up to 8 bits).
RANDOM REFERENCE (octet 1)
This is an unformatted field with variable length (from 5 bits down to 0 bits).
The Uplink access message is coded as follows:
(Random Reference field is filled with "x").
Table 9.1.45.1: UPLINK ACCESS message content
|
Message |
Meaning of Establishment Cause |
|
1 1 0 x x x x x |
Subsequent talker uplink request |
|
0 0 1 0 0 1 0 1 |
Reply on uplink access request |
|
1 0 1 x x x x x |
Privilege subscriber request |
|
1 1 1 x x x x x |
Emergency subscriber request |
|
0 0 0 x x x x x |
Emergency mode reset request |
|
0 1 0 x x x x x |
UL request for sending application-specific data |
|
other values |
reserved for future use |