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authorJacob Erlbeck <jerlbeck@sysmocom.de>2016-01-19 15:53:30 +0100
committerJacob Erlbeck <jerlbeck@sysmocom.de>2016-02-08 00:45:36 +0100
commit36df7740dd7f81fe36d35e808cc53f518f4e360e (patch)
treec204fcc8e691a99ce2a42eb7b7491bea6248c01c /src/encoding.cpp
parent08c72fb4a91c267410535be26d2bb399914ff6d4 (diff)
edge: Make window size configurable
Currently the window size is fixed to 64 even for EGPRS. Support dynamic window sizes depending on the number of PDCH. The WS can be set to b + f * N_PDCH. If the result is not valid according to TS 44.060, Table 9.1.9.2.1, the value will be corrected to use the next lower valid value (or 64). The following VTY commands are added (config-pcu node): window-size <0-1024> set base (b) value and leave f unchanged window-size <0-1024> <0-256> set base (b) and factor (f) Sponsored-by: On-Waves ehf
Diffstat (limited to 'src/encoding.cpp')
-rw-r--r--src/encoding.cpp9
1 files changed, 7 insertions, 2 deletions
diff --git a/src/encoding.cpp b/src/encoding.cpp
index 9def283..a26a5db 100644
--- a/src/encoding.cpp
+++ b/src/encoding.cpp
@@ -208,13 +208,14 @@ void Encoding::write_packet_uplink_assignment(
}
} else { /* EPGRS */
+ unsigned int ws_enc = (tbf->m_window.ws() - 64) / 32;
bitvec_write_field(dest, wp,0x1,1); // Message escape
bitvec_write_field(dest, wp,0x0,2); // EGPRS message contents
bitvec_write_field(dest, wp,0x0,1); // No CONTENTION_RESOLUTION_TLLI
bitvec_write_field(dest, wp,0x0,1); // No COMPACT reduced MA
bitvec_write_field(dest, wp,tbf->current_cs().to_num()-1, 4); // EGPRS Modulation and Coding IE
bitvec_write_field(dest, wp,0x0,1); // No RESEGMENT
- bitvec_write_field(dest, wp,0x0,5); // EGPRS Window Size = 64
+ bitvec_write_field(dest, wp,ws_enc,5); // EGPRS Window Size
bitvec_write_field(dest, wp,0x0,1); // No Access Technologies Request
bitvec_write_field(dest, wp,0x0,1); // No ARAC RETRANSMISSION REQUEST
bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING
@@ -282,6 +283,7 @@ void Encoding::write_packet_downlink_assignment(RlcMacDownlink_t * block,
PDA_AdditionsR99_t *pda_r99;
uint8_t tn;
+ unsigned int ws_enc;
block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header
block->RRBP = 0x0; // N+13
@@ -348,10 +350,13 @@ void Encoding::write_packet_downlink_assignment(RlcMacDownlink_t * block,
block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off
return;
}
+
+ ws_enc = (tbf->window()->ws() - 64) / 32;
+
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->EGPRS_WindowSize = ws_enc; /* 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;