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Add data structure for SPB in EGPRS UL 

Modify header files with data structures required
to support split blocks for EGPRS UL TBF

This feature provides provision for MS to retransmit
RLC blocks of HeaderType1, HeaderType2 by segmenting
them to 2 HeaderType3 blocks(Example MCS5 will be
retransmitted as 2 MCS2 blocks). Table 10.4.8b.1 of 44.060
explains the possible values of SPB in HeadrType3 for UL
direction. When the MCS is changed at the PCU, PCU directs the
changed MCS to MS by PUAN or UPLINK ASSIGNMENT message along
with RESEGMENT flag, Then MS may decide to retransmit the
blocks by resegmenting it based on Table 8.1.1.1 of 44.060.
The retransmission MCS is calculated based on current MCS of
the Block and demanded MCS by PCU. Section 10.3a.4.3 of 44.060
shows the HeadrType3 with SPB field present in it.

Change-Id: I83ccd136bb361adcfd511c57c5a9d95ed72c36c2
This commit is contained in:
Aravind Sirsikar 2016-07-26 17:13:59 +05:30 committed by Holger Freyther
parent d572054ca7
commit 36bdc5f7a4
1 changed files with 40 additions and 0 deletions
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40
src/rlc.h
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@ -55,6 +55,34 @@ enum gprs_rlc_dl_bsn_state {
GPRS_RLC_DL_BSN_MAX,
};
/*
* EGPRS resegment status information for UL
* When only first split block is received bsn state
* will be set to EGPRS_RESEG_FIRST_SEG_RXD and when
* only second segment is received the state will be
* set to EGPRS_RESEG_SECOND_SEG_RXD. When both Split
* blocks are received the state will be set to
* EGPRS_RESEG_DEFAULT
* The EGPRS resegmentation feature allows MS to retransmit
* RLC blocks of HeaderType1, HeaderType2 by segmenting
* them to 2 HeaderType3 blocks(Example MCS5 will be
* retransmitted as 2 MCS2 blocks). Table 10.4.8b.1 of 44.060
* explains the possible values of SPB in HeadrType3 for UL
* direction. When the MCS is changed at the PCU, PCU directs the
* changed MCS to MS by PUAN or UPLINK ASSIGNMENT message along
* with RESEGMENT flag, Then MS may decide to retransmit the
* blocks by resegmenting it based on Table 8.1.1.1 of 44.060.
* The retransmission MCS is calculated based on current MCS of
* the Block and demanded MCS by PCU. Section 10.3a.4.3 of 44.060
* shows the HeadrType3 with SPB field present in it
*/
enum egprs_rlc_ul_reseg_bsn_state {
EGPRS_RESEG_DEFAULT = 0,
EGPRS_RESEG_FIRST_SEG_RXD = 0x01,
EGPRS_RESEG_SECOND_SEG_RXD = 0x02,
EGPRS_RESEG_INVALID = 0x04
};
/*
* Valid puncturing scheme values
* TS 44.060 10.4.8a.3.1, 10.4.8a.2.1, 10.4.8a.1.1
@ -109,6 +137,15 @@ struct gprs_rlc_data_info {
struct gprs_rlc_data_block_info block_info[2];
};
/* holds the current status of the block w.r.t UL/DL split blocks */
union split_block_status {
egprs_rlc_ul_reseg_bsn_state block_status_ul;
/*
* TODO: DL split block status need to be supported
* for EGPRS DL
*/
};
struct gprs_rlc_data {
uint8_t *prepare(size_t block_data_length);
void put_data(const uint8_t *data, size_t len);
@ -133,6 +170,9 @@ struct gprs_rlc_data {
/* puncturing scheme value to be used for next transmission*/
enum egprs_puncturing_values next_ps;
/* holds the status of the block w.r.t UL/DL split blocks*/
union split_block_status spb_status;
};
void gprs_rlc_data_info_init_dl(struct gprs_rlc_data_info *rlc,