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srsRAN_4G
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mac_nr: update RA related function in MAC/PHY interface

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* expose interface to trigger PRACH from MAC
* indicate PRACH tx from PHY
* add temporary RAR PDU handling with Msg3 grant indication to PHY
master
Andre Puschmann 4 years ago
parent 01acf95566
commit 6eed6f622f
6 changed files with 109 additions and 22 deletions
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22
lib/include/srslte/interfaces/ue_nr_interfaces.h
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@ -15,6 +15,7 @@
#include "srslte/common/interfaces_common.h"
#include "srslte/interfaces/mac_interface_types.h"
#include <array>
#include <string>
namespace srsue {
@ -46,12 +47,26 @@ public:
virtual int sf_indication(const uint32_t tti) = 0; ///< FIXME: rename to slot indication
// Query the MAC for the current RNTI to look for
virtual uint16_t get_dl_sched_rnti(const uint32_t tti) = 0;
virtual uint16_t get_ul_sched_rnti(const uint32_t tti) = 0;
/// Indicate succussfully received TB to MAC. The TB buffer is allocated in the PHY and handed as unique_ptr to MAC
virtual void tb_decoded(const uint32_t cc_idx, mac_nr_grant_dl_t& grant) = 0;
/// Indicate reception of UL grant (only TBS is provided). Buffer for resulting MAC PDU is provided by MAC and is
/// passed as pointer to PHY during tx_reuqest
virtual void new_grant_ul(const uint32_t cc_idx, const mac_nr_grant_ul_t& grant) = 0;
/**
* @brief Indicate the successful transmission of a PRACH.
* @param tti The TTI from the PHY viewpoint at which the PRACH was sent over-the-air (not to the radio).
* @param s_id The index of the first OFDM symbol of the specified PRACH (0 <= s_id < 14).
* @param t_id The index of the first slot of the specified PRACH (0 <= t_id < 80).
* @param f_id The index of the specified PRACH in the frequency domain (0 <= f_id < 8).
* @param ul_carrier_id The UL carrier used for Msg1 transmission (0 for NUL carrier, and 1 for SUL carrier).
*/
virtual void prach_sent(uint32_t tti, uint32_t s_id, uint32_t t_id, uint32_t f_id, uint32_t ul_carrier_id) = 0;
};
class mac_interface_rrc_nr
@ -77,6 +92,13 @@ public:
uint8_t* data; // always a pointer in our case
} tx_request_t;
// MAC informs PHY about UL grant included in RAR PDU
virtual int set_ul_grant(std::array<uint8_t, SRSLTE_RAR_UL_GRANT_NBITS>) = 0;
// MAC instructs PHY to send a PRACH at the next given occasion
virtual void send_prach(uint32_t prach_occasion, uint32_t preamble_index, int preamble_received_target_power) = 0;
// MAC instructs PHY to transmit MAC TB at the given TTI
virtual int tx_request(const tx_request_t& request) = 0;
};

2
srsue/hdr/phy/vnf_phy_nr.h
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@ -48,6 +48,8 @@ public:
// MAC interface
int tx_request(const tx_request_t& request);
int set_ul_grant(std::array<uint8_t, SRSLTE_RAR_UL_GRANT_NBITS>) { return SRSLTE_SUCCESS; };
void send_prach(uint32_t prach_occasion, uint32_t preamble_index, int preamble_received_target_power){};
private:
std::unique_ptr<srslte::srslte_basic_vnf> vnf;

21
srsue/hdr/stack/mac_nr/mac_nr.h
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@ -40,22 +40,25 @@ public:
void stop();
void reset();
void run_tti(const uint32_t tti);
uint16_t get_dl_sched_rnti(uint32_t tti);
uint16_t get_ul_sched_rnti(uint32_t tti);
void bch_decoded_ok(uint32_t tti, srslte::unique_byte_buffer_t payload);
int sf_indication(const uint32_t tti);
/// Interface for PHY
uint16_t get_dl_sched_rnti(const uint32_t tti);
uint16_t get_ul_sched_rnti(const uint32_t tti);
int sf_indication(const uint32_t tti);
void tb_decoded(const uint32_t cc_idx, mac_nr_grant_dl_t& grant);
void new_grant_ul(const uint32_t cc_idx, const mac_nr_grant_ul_t& grant);
void prach_sent(const uint32_t tti,
const uint32_t s_id,
const uint32_t t_id,
const uint32_t f_id,
const uint32_t ul_carrier_id);
/// Stack interface
void timer_expired(uint32_t timer_id);
void get_metrics(mac_metrics_t* metrics);
/// Interface for RRC (RRC -> MAC)
@ -69,9 +72,13 @@ public:
void process_pdus();
private:
void write_pcap(const uint32_t cc_idx, mac_nr_grant_dl_t& grant); // If PCAPs are enabled for this MAC
void handle_pdu(srslte::unique_byte_buffer_t pdu);
void get_ul_data(const mac_nr_grant_ul_t& grant, phy_interface_stack_nr::tx_request_t* tx_request);
// temporary helper
void handle_rar_pdu(mac_nr_grant_dl_t& grant);
bool is_si_opportunity();
bool is_paging_opportunity();

5
srsue/hdr/stack/ue_stack_lte.h
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@ -127,6 +127,11 @@ public:
{
// ignored, timing will be handled by EUTRA
}
void prach_sent(uint32_t tti, uint32_t s_id, uint32_t t_id, uint32_t f_id, uint32_t ul_carrier_id) final
{
mac_nr.prach_sent(tti, s_id, t_id, f_id, ul_carrier_id);
}
#endif
// Interface for GW

8
srsue/hdr/stack/ue_stack_nr.h
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@ -74,13 +74,19 @@ public:
void run_tti(uint32_t tti) final;
// MAC interface for PHY
int sf_indication(const uint32_t tti)
uint16_t get_dl_sched_rnti(const uint32_t tti) { return mac->get_dl_sched_rnti(tti); }
uint16_t get_ul_sched_rnti(const uint32_t tti) { return mac->get_ul_sched_rnti(tti); }
int sf_indication(const uint32_t tti)
{
run_tti(tti);
return SRSLTE_SUCCESS;
}
void tb_decoded(const uint32_t cc_idx, mac_nr_grant_dl_t& grant) final { mac->tb_decoded(cc_idx, grant); }
void new_grant_ul(const uint32_t cc_idx, const mac_nr_grant_ul_t& grant) final { mac->new_grant_ul(cc_idx, grant); }
void prach_sent(uint32_t tti, uint32_t s_id, uint32_t t_id, uint32_t f_id, uint32_t ul_carrier_id)
{
mac->prach_sent(tti, s_id, t_id, f_id, ul_carrier_id);
}
// Interface for GW
void write_sdu(uint32_t lcid, srslte::unique_byte_buffer_t sdu) final;

73
srsue/src/stack/mac_nr/mac_nr.cc
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@ -11,6 +11,7 @@
*/
#include "srsue/hdr/stack/mac_nr/mac_nr.h"
#include "srslte/mac/mac_rar_pdu_nr.h"
namespace srsue {
@ -69,7 +70,7 @@ void mac_nr::run_tti(const uint32_t tti)
logger.debug("Running MAC tti=%d", tti);
}
uint16_t mac_nr::get_ul_sched_rnti(uint32_t tti)
uint16_t mac_nr::get_ul_sched_rnti(const uint32_t tti)
{
return crnti;
}
@ -85,7 +86,7 @@ bool mac_nr::is_paging_opportunity()
return false;
}
uint16_t mac_nr::get_dl_sched_rnti(uint32_t tti)
uint16_t mac_nr::get_dl_sched_rnti(const uint32_t tti)
{
// Priority: SI-RNTI, P-RNTI, RA-RNTI, Temp-RNTI, CRNTI
if (is_si_opportunity()) {
@ -141,6 +142,33 @@ int mac_nr::sf_indication(const uint32_t tti)
return SRSLTE_SUCCESS;
}
void mac_nr::prach_sent(const uint32_t tti,
const uint32_t s_id,
const uint32_t t_id,
const uint32_t f_id,
const uint32_t ul_carrier_id)
{
// TODO: indicate to RA proc
}
// This function handles all PCAP writing for a decoded DL TB
void mac_nr::write_pcap(const uint32_t cc_idx, mac_nr_grant_dl_t& grant)
{
if (pcap) {
for (uint32_t i = 0; i < SRSLTE_MAX_CODEWORDS; ++i) {
if (grant.tb[i] != nullptr) {
if (SRSLTE_RNTI_ISRAR(grant.rnti)) { // TODO: replace with proc_ra->get_rar_rnti()
pcap->write_dl_ra_rnti_nr(grant.tb[i]->msg, grant.tb[i]->N_bytes, grant.rnti, true, grant.tti);
} else if (grant.rnti == SRSLTE_PRNTI) {
pcap->write_dl_pch_nr(grant.tb[i]->msg, grant.tb[i]->N_bytes, grant.rnti, true, grant.tti);
} else {
pcap->write_dl_crnti_nr(grant.tb[i]->msg, grant.tb[i]->N_bytes, grant.rnti, true, grant.tti);
}
}
}
}
}
/**
* \brief Called from PHY after decoding a TB
*
@ -151,29 +179,46 @@ int mac_nr::sf_indication(const uint32_t tti)
*/
void mac_nr::tb_decoded(const uint32_t cc_idx, mac_nr_grant_dl_t& grant)
{
if (SRSLTE_RNTI_ISRAR(grant.rnti)) {
// TODO: deliver to RA procedure
} else if (grant.rnti == SRSLTE_PRNTI) {
// Send PCH payload to RLC
// rlc->write_pdu_pcch(pch_payload_buffer, grant.tb[0].tbs);
if (pcap) {
// pcap->write_dl_pch(pch_payload_buffer, grant.tb[0].tbs, true, grant.tti);
}
write_pcap(cc_idx, grant);
// handle PDU
if (SRSLTE_RNTI_ISRAR(grant.rnti)) { // TODO: replace with proc_ra->get_rar_rnti()
// TODO: pass to RA proc
handle_rar_pdu(grant);
} else {
// Push DL PDUs to queue for back-ground processing
for (uint32_t i = 0; i < SRSLTE_MAX_CODEWORDS; ++i) {
if (grant.tb[i] != nullptr) {
if (pcap) {
pcap->write_dl_crnti_nr(grant.tb[i]->msg, grant.tb[i]->N_bytes, grant.rnti, true, grant.tti);
}
pdu_queue.push(std::move(grant.tb[i]));
}
}
}
metrics[cc_idx].rx_pkts++;
stack_task_dispatch_queue.push([this]() { process_pdus(); });
}
// Temporary helper until RA proc is complete
void mac_nr::handle_rar_pdu(mac_nr_grant_dl_t& grant)
{
for (uint32_t i = 0; i < SRSLTE_MAX_CODEWORDS; ++i) {
if (grant.tb[i] != nullptr) {
srslte::mac_rar_pdu_nr pdu;
if (!pdu.unpack(grant.tb[i]->msg, grant.tb[i]->N_bytes)) {
logger.warning("Error unpacking RAR PDU");
return;
}
logger.info(pdu.to_string());
for (auto& subpdu : pdu.get_subpdus()) {
if (subpdu.has_rapid() && subpdu.get_rapid() == 0 /* selected preamble */) {
phy->set_ul_grant(subpdu.get_ul_grant());
}
}
}
}
}
void mac_nr::new_grant_ul(const uint32_t cc_idx, const mac_nr_grant_ul_t& grant)
{
phy_interface_stack_nr::tx_request_t tx_request = {};

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