edge: Support EGPRS in write_packet_downlink_assignment
Add an use_egprs parameter to write_packet_downlink_assignment
and add the EGPRS related fields if it is set to true. The
window size is fixed at 64 blocks, link quality measurement
reports have been disabled, and the other optional fields are not
present.
Sponsored-by: On-Waves ehf
diff --git a/src/encoding.cpp b/src/encoding.cpp
index acd8f43..fdc8d0a 100644
--- a/src/encoding.cpp
+++ b/src/encoding.cpp
@@ -269,12 +269,15 @@
/* generate downlink assignment */
-void Encoding::write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t old_tfi,
- uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf, uint8_t poll,
- uint8_t alpha, uint8_t gamma, int8_t ta_idx, uint8_t ta_ts)
+void Encoding::write_packet_downlink_assignment(RlcMacDownlink_t * block,
+ uint8_t old_tfi, uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf,
+ uint8_t poll, uint8_t alpha, uint8_t gamma, int8_t ta_idx, uint8_t ta_ts,
+ bool use_egprs)
{
// Packet downlink assignment TS 44.060 11.2.7
+ PDA_AdditionsR99_t *pda_r99;
+
uint8_t tn;
block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
@@ -338,7 +341,18 @@
block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off
block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off
- block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
+ if (!use_egprs) {
+ block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
+ return;
+ }
+ block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x1; // AdditionsR99 = on
+ pda_r99 = &block->u.Packet_Downlink_Assignment.AdditionsR99;
+ pda_r99->Exist_EGPRS_Params = 1;
+ pda_r99->EGPRS_WindowSize = 0; /* 64, see TS 44.060, table 12.5.2.1 */
+ pda_r99->LINK_QUALITY_MEASUREMENT_MODE = 0x0; /* no meas, see TS 44.060, table 11.2.7.2 */
+ pda_r99->Exist_BEP_PERIOD2 = 0; /* No extra EGPRS BEP PERIOD */
+ pda_r99->Exist_Packet_Extended_Timing_Advance = 0;
+ pda_r99->Exist_COMPACT_ReducedMA = 0;
}
/* generate paging request */