9.1.64 EC DOWNLINK ASSIGNMENT
3GPP44.018GSM/EDGE Radio Resource Control (RRC) protocolMobile radio interface Layer 3 specificationRelease 17TS
This message is sent on the EC-CCCH by the network to assign downlink packet resources to a mobile station that has enabled EC operation.
Message type: EC DOWNLINK ASSIGNMENT
Significance: dual
Direction: network to mobile station
Table 9.1.64.1: EC DOWNLINK ASSIGNMENT message content
< EC Downlink Assignment message content > ::= < Message Type : bit (4) > < Used DL Coverage Class: bit (2) > { 0 | 1 < EC Page Extension : bit (4) > } < TLLI : bit (32) > < EC Packet Channel Description Type 2 : bit (15) > < EC Downlink Allocation : < EC Downlink Allocation struct >> — Additions in release Rel-14: < Multilateration Information Request : bit (1) > <spare padding> ; |
< EC Downlink Allocation struct > ::= < Timing Advance : bit (6) > < STARTING_DL_TIMESLOT : bit (3) > < Downlink_TFI_Assignment : bit (5) > < TIMESLOT_MULIPLICATOR : bit (2) > < STARTING_UL_TIMESLOT_OFFSET (2) > < GAMMA : bit (5) > < ALPHA Enable : bit (1) > { 0 | 1 < P0 : bit (4) > < PR_MODE : bit (1) > } ; |
Table 9.1.64.2: EC DOWNLINK ASSIGNMENT message details
Message Type (4 bit field) This field indicates the type of message sent on the EC-CCCH (see Table 10.4.4) |
Used DL Coverage Class (2 bit field) This field is coded as described in sub-clause 9.1.60. |
EC Page Extension (4 bit field) This field is coded as described in sub-clause 9.1.60. |
TLLI (32 bit field) This field is the binary representation of a TLLI. The coding of TLLI is left open for each administration using the structure specified in 3GPP TS 23.003. |
EC Packet Channel Description Type 2 (15 bit field) This information element is coded as described in sub-clause 10.5.2.85 |
Timing Advance (6 bit field) This field is coded as described in sub-clause 9.1.60 |
STARTING_DL_TIMESLOT (3 bit field) This field indicates the first assigned timeslot within the set of assigned downlink timeslots.: Bit 3 2 1 0 0 0 Timeslot 0 is the first assigned downlink timeslot 0 0 1 Timeslot 1 is the first assigned downlink timeslot 0 1 0 Timeslot 2 is the first assigned downlink timeslot 0 1 1 Timeslot 3 is the first assigned downlink timeslot 1 0 0 Timeslot 4 is the first assigned downlink timeslot 1 0 1 Timeslot 5 is the first assigned downlink timeslot 1 1 0 Timeslot 6 is the first assigned downlink timeslot 1 1 1 Timeslot 7 is the first assigned downlink timeslot If the field EC_Reduced_PDCH_Allocation is set to 0 in the EC SYSTEM INFORMATION TYPE 2 message (see sub-clause 9.1.43q): A mobile station using CC2, CC3 or CC4 on the downlink is always assigned 4 consecutive timeslots and therefore only timeslot 0, 1, 2, 3 or 4 shall be indicated as the first assigned downlink timeslot. If the field EC_Reduced_PDCH_Allocation is set to 1 in the EC SYSTEM INFORMATION TYPE 2 message (see sub-clause 9.1.43q): A mobile station using CC2, CC3 or CC4 on the downlink is always assigned 2 consecutive timeslots and therefore only timeslot 0, 1, 2, 3, 4, 5 or 6 shall be indicated as the first assigned downlink timeslot. |
Downlink_TFI_Assignment (5 bit field) This field is the binary representation of the Temporary Flow Identity, see 3GPP TS 44.060. Range: 0 to 31. |
TIMESLOT_MULTIPLICATOR (2 bit field) bit 2 1 0 0 1 timeslot assigned 0 1 2 timeslots assigned 1 0 3 timeslots assigned 1 1 4 timeslots assigned Values other than ‘00’ can only be used if supported by the mobile station, as indicated by its multislot capability, see 3GPP TS 45.002 [32]. If the assigned downlink Coverage Class > CC1 (see the EC Packet Channel Description Type 2 field), the mobile station shall consider the TIMESLOT_MULTIPLICATOR field as invalid. |
STARTING_UL_TIMESLOT_OFFSET (2 bit field) If both DL_COVERAGE_CLASS and UL_COVERAGE_CLASS > CC1, the same timeslots are assigned in both the uplink and the downlink directions. The STARTING_UL_TIMESLOT_OFFSET field can then be considered as not valid by the mobile station. If DL_COVERAGE_CLASS = CC1 and UL_COVERAGE_CLASS > CC1, the STARTING_UL_TIMESLOT_OFFSET field is encoded according to the following code points if the field EC_Reduced_PDCH_Allocation is set to 0 in the EC SYSTEM INFORMATION TYPE 2 message (see sub-clause 9.1.43q). If the field EC_Reduced_PDCH_Allocation is set to 1 only the first two code points of the following shall be used: bit 2 1 0 0 Same timeslot as indicated by STARTING_DL_TIMESLOT 0 1 STARTING_DL_TIMESLOT – 1 1 0 STARTING_DL_TIMESLOT – 2 1 1 STARTING_DL_TIMESLOT – 3 If DL_COVERAGE_CLASS > CC1 and UL_COVERAGE_CLASS = CC1, the STARTING_UL_TIMESLOT_OFFSET field is encoded according to the following code points if the field EC_Reduced_PDCH_Allocation is set to 0 in the EC SYSTEM INFORMATION TYPE 2 message (see sub-clause 9.1.43q). If the field EC_Reduced_PDCH_Allocation is set to 1 only the first two code points of the following shall be used: bit 2 1 0 0 Same timeslot as indicated by STARTING_DL_TIMESLOT 0 1 STARTING_DL_TIMESLOT + 1 1 0 STARTING_DL_TIMESLOT + 2 1 1 STARTING_DL_TIMESLOT + 3 If both DL_COVERAGE_CLASS and UL_COVERAGE_CLASS = CC1 (indicated by the EC Packet Channel Description Type 2 IE – see sub-clause 10.5.2.85), the uplink EC-PACCH is assigned to the timeslot indicated by the STARTING_DL_TIMESLOT field. In this case the STARTING_UL_TIMESLOT_OFFSET field is considered as invalid by the mobile station. |
GAMMA (5 bit field) This field is the binary representation of the parameter CH for MS output power control in units of 2 dB, see 3GPP TS 45.008. |
ALPHA Enable (1 bit field) This field is coded as described in sub-clause 9.1.60 |
P0 (4 bit field) For description and encoding, see the Packet Uplink Assignment message in 3GPP TS 44.060. |
PR_MODE (1 bit field) For description and encoding, see the Packet Uplink Assignment message in 3GPP TS 44.060. |
Multilateration Information Request (1 bit field) This field indicates whether or not a MS is to include "MS Transmission Offset" and "MS Sync Accuracy" parameters when sending an EC Packet Downlink Ack/Nack message (see 3GPP TS 44.060 [76]) during a downlink EC TBF. This field is coded as follows: 0 Do not include "MS Transmission Offset" and "MS Sync Accuracy" parameters 1 Include the "MS Transmission Offset" and "MS Sync Accuracy" parameters |