9.1.59 EC IMMEDIATE ASSIGNMENT TYPE 1

3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS

This message is sent on the CCCH by the network to assign uplink packet resources to a mobile station that has enabled EC operation and attempts system access using the RACH. When sending this message the network assigns pre-allocated uplink resources to the mobile station (see sub-clause 3.5.2.1.3.1).

The L2 pseudo length of this message is the sum of lengths of all information elements present in the message except the L2 Pseudo Length information elements.

Message type: EC IMMEDIATE ASSIGNMENT TYPE 1

Significance: dual

Direction: network to mobile station

Table 9.1.59.1: EC IMMEDIATE ASSIGNMENT TYPE 1 information elements

IEI	Information element	Type / Reference	Presence	Format	length
	L2 Pseudo Length	L2 Pseudo Length 10.5.2.19	M	V	1
	RR management Protocol Discriminator	Protocol Discriminator 10.2	M	V	1/2
	Skip Indicator	Skip Indicator 10.3.1	M	V	1/2
	EC Immediate Assignment Type 1 Message Type	Message Type 10.4	M	V	1
	Page Mode	Page Mode 10.5.2.26	M	V	1/2
	Feature Indicator	Feature Indicator 10.5.2.76	M	V	1/2
	Request Reference	Request Reference 10.5.2.30	M	V	3
	EC Packet Channel Description Type 1	EC Packet Channel Description Type 1 10.5.2.84	M	V	2
	EC Fixed Uplink Allocation	EC Fixed Uplink Allocation 10.5.2.86	M	V	4 – 14

9.1.59.0 Request Reference

When included in the EC IMMEDIATE ASSIGNMENT TYPE 1 message the content of Request Reference IE reflects the TDMA frame used to send the EC PACKET CHANNEL REQUEST message on the RACH and the random bits included within the EC PACKET CHANNEL REQUEST message (see sub-clause 9.1.65).

9.1.59.1 EC Packet Channel Description Type 1

The EC Packet Channel Description Type 1 IE identifies the radio parameters applicable to an uplink EC TBF for a mobile station that has enabled EC operation and is attempting system access using the RACH (i.e. Coverage Class 1 has been selected by the mobile station for both the uplink and the downlink).

9.1.59.2 EC Fixed Uplink Allocation

The EC Fixed Uplink Allocation IE identifies the parameters required for uplink packet data transfer when EC operation is enabled (see sub-clause 10.5.2.86).