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srsLTE
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renamed rlc pdu / mac sdu allocate functions, and added some comments describing what these functions do

This commit is contained in:
Francisco Paisana 2020-02-10 14:31:50 +00:00
parent 87038375d5
commit c9ac42f11d
2 changed files with 10 additions and 3 deletions
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2
srsenb/hdr/stack/mac/scheduler_ue.h
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@ -224,7 +224,7 @@ private:
bool is_sr_triggered();
uint32_t format1_count_prb(const rbgmask_t& bitmask, uint32_t cc_idx);
int alloc_mac_sdu(sched_interface::dl_sched_pdu_t* pdu, int rem_tbs);
int alloc_rlc_pdu(sched_interface::dl_sched_pdu_t* mac_sdu, int rem_tbs);
uint32_t allocate_mac_sdus(sched_interface::dl_sched_data_t* data, uint32_t total_tbs);
static bool bearer_is_ul(ue_bearer_t* lch);

11
srsenb/src/stack/mac/scheduler_ue.cc
View File

@ -361,8 +361,15 @@ void sched_ue::tpc_dec()
*
*******************************************************/
/**
* Allocate space for multiple MAC SDUs (i.e. RLC PDUs) and corresponding MAC SDU subheaders
* @param data struct where the rlc pdu allocations are stored
* @param total_tbs available TB size for allocations for a single UE
* @return allocated bytes, which is always equal or lower than total_tbs
*/
uint32_t sched_ue::allocate_mac_sdus(sched_interface::dl_sched_data_t* data, uint32_t total_tbs)
{
// TS 36.321 sec 7.1.2 - MAC PDU subheader is 2 bytes if L<=128 and 3 otherwise
auto compute_subheader_size = [](uint32_t sdu_size) { return sdu_size > 128 ? 3 : 2; };
constexpr uint32_t min_mac_sdu_size = 5; // accounts for MAC SDU subheader and RLC header
uint32_t rem_tbs = total_tbs;
@ -370,7 +377,7 @@ uint32_t sched_ue::allocate_mac_sdus(sched_interface::dl_sched_data_t* data, uin
// if we do not have enough bytes to fit MAC subheader and RLC header, skip MAC SDU allocation
while (rem_tbs >= min_mac_sdu_size) {
uint32_t max_sdu_bytes = rem_tbs - compute_subheader_size(rem_tbs - 2);
uint32_t alloc_sdu_bytes = alloc_mac_sdu(&data->pdu[0][data->nof_pdu_elems[0]], max_sdu_bytes);
uint32_t alloc_sdu_bytes = alloc_rlc_pdu(&data->pdu[0][data->nof_pdu_elems[0]], max_sdu_bytes);
if (alloc_sdu_bytes == 0) {
break;
}
@ -1014,7 +1021,7 @@ sched_ue_carrier* sched_ue::get_ue_carrier(uint32_t enb_cc_idx)
}
/* Allocates first available RLC PDU */
int sched_ue::alloc_mac_sdu(sched_interface::dl_sched_pdu_t* mac_sdu, int rem_tbs)
int sched_ue::alloc_rlc_pdu(sched_interface::dl_sched_pdu_t* mac_sdu, int rem_tbs)
{
// TODO: Implement lcid priority (now lowest index is lowest priority)
int alloc_bytes = 0;