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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.
openair2/LAYER2/RLC/AM_v9.2.0/README deleted 100644 → 0
View file @ 9a1b5517
#######################################
WHAT IS IMPLEMENTED:
#######################################
- Segmentation and reassembly:
- Concatenation:
- Padding:
- Transfer of user data:
- Error correction:
- In-sequence delivery of upper layer PDUs:
- Duplicate detection:
- Flow control:
- Sequence number check:
- Protocol error detection and recovery:
- Ciphering:
Not implemented
- SDU discard:
- Out of sequence SDU delivery:
- Duplicate avoidance and reordering:
#######################################
MEMO FOR LG:
#######################################
The uplink AMD PDU size is a semi-static value that is configured by upper layers and can only be changed through re-establishment of the AM RLC entity by upper layers.
openair2/LAYER2/RLC/AM_v9.2.0/rlc_am_entity.h deleted 100755 → 0
View file @ 9a1b5517
/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
/***************************************************************************
rlc_am_entity.h -
-------------------
AUTHOR : Lionel GAUTHIER
COMPANY : EURECOM
EMAIL : Lionel.Gauthier@eurecom.fr
***************************************************************************/
# ifndef __RLC_AM_ENTITY_H__
# define __RLC_AM_ENTITY_H__
//-----------------------------------------------------------------------------
# include "mem_block.h"
# include "rlc_am_structs.h"
# include "rlc_def.h"
# include "platform_types.h"
# include "platform_constants.h"
//-----------------------------------------------------------------------------
struct rlc_am_entity {
module_id_t module_id;
// for stats and trace purpose :
uint16_t data_plane; // act as a boolean
uint16_t rb_id;
//-----------------------------
// polling info
//-----------------------------
uint16_t poll_pdu_trigger;
uint16_t poll_sdu_trigger;
uint16_t timer_poll_trigger;
uint16_t timer_poll_prohibit_trigger;
uint8_t last_transmission_pdu_poll_trigger;
uint8_t last_retransmission_pdu_poll_trigger;
uint8_t poll_window_trigger;
//mem_block_t *timer_rst;
uint16_t time_out_events;
//mem_block_t *timer_mrw; // if NULL : no timer is running
//uint8_t timer_mrw_is_running;
uint16_t timer_rst_init;
uint16_t timer_mrw_init;
uint32_t transmitted_pdu_types;
int last_tx_status_frame;
uint32_t *frame_tick_milliseconds; // pointer on this tick variable handled by RRC : READ ONLY
uint8_t missing_pdu_indicator;
//-----------------------------
// tranmission
//-----------------------------
//struct cnt_dbl_lk_list_up segmentation_buffer; // output of segmentation/concatenation function
list2_t sdu_conf_segmented; // contain sdu_headers:sdu processed by the segmentation unit. (we keep them for confirm)
list2_t sdu_discard_segmented; // contain sdu_headers:sdu processed by the segmentation unit. (we keep them for discard)
list2_t sdu_discarded; // contain sdu_headers
list2_t discard_procedures; // contain procedures (struct rlc_am_discard_procedure)
//struct cnt_dbl_lk_list_up transmission_buffer; // output of mux module
//uint16_t data_pdu_size;
//uint16_t control_pdu_size;
//struct cnt_list_up dcch_pdus_to_mac_layer;
//struct cnt_list_up dtch_pdus_to_mac_layer;
//struct list_up dcch_pdus_from_mac_layer;
//struct list_up dtch_pdus_from_mac_layer;
// implementation specific: our transmiter buffer is an array whose size must be a power of 2
# define RLC_AM_DISCARD_REASSEMBLY_AT_LI_INDEX_0 0x00
uint8_t discard_reassembly_after_li; // when received mrw sufi
uint16_t discard_reassembly_start_sn;
//-----------------------------
// management of received PDU for piggybacked status PDU and status PDU
//-----------------------------
struct sufi_to_insert_in_status status_in_construction[NB_MAX_SUFI];
struct sufi_ack ack;
uint8_t sufi_to_insert_index;
//-----------------------------
// Reset
//-----------------------------
uint8_t send_status_pdu_requested;
uint8_t reset_sequence_number;
uint8_t last_received_rsn;
uint8_t max_rst;
//-----------------------------
// Mapping info
//-----------------------------
uint8_t dcch_logical_channel_identity;
uint8_t dtch_logical_channel_identity;
uint8_t nb_logical_channels_per_rlc;
//-----------------------------
// buffer occupancy measurements sent to MAC
//-----------------------------
// note occupancy of other buffers is deducted from nb elements in lists
uint32_t buffer_occupancy_retransmission_buffer; // nb of pdus
//**************************************************************
// new members
//**************************************************************
uint8_t allocation;
uint8_t location; // UTRAN/UE
uint8_t protocol_state;
//-----------------------------
// STATE VARIABLES
//-----------------------------
uint16_t vt_s; // send state variable
// This state variable contains the "Sequence Number" of the next AMD PDU to
// be transmitted for the first time (i.e. excluding retransmitted PDUs). It
// shall be updated after the aforementioned AMD PDU is transmitted or after
// transmission of a MRW SUFI which includes SN_MRWLENGTH >VT(S)
// (see subclause 11.6).
// The initial value of this variable is 0
uint16_t vt_a; // Acknowledge state variable
// This state variable contains the "Sequence Number" following the "Sequence
// Number" of the last in-sequence acknowledged AMD PDU. This forms the lower
// edge of the transmission window of acceptable acknowledgements. VT(A) shall
// be updated based on the receipt of a STATUS PDU including an ACK (see
// subclause 9.2.2.11.2) and/or an MRW_ACK SUFI (see subclause 11.6).
// The initial value of this variable is 0. For the purpose of initialising
// the protocol, this value shall be assumed to be the first "Sequence Number"
// following the last in-sequence acknowledged AMD PDU.
uint16_t vt_ms; // Maximum send state variable
// This state variable contains the "Sequence Number" of the first AMD PDU
// that can be rejected by the peer Receiver, VT(MS) = VT(A) + VT(WS).
// This value represents the upper edge of the transmission window. The
// transmitter shall not transmit AMD PDUs with "Sequence Number" >= VT(MS)
// unless VT(S) >= VT(MS). In that case, the AMD PDU with
// "Sequence Number" = VT(S) - 1 can also be transmitted. VT(MS) shall be
// updated when VT(A) or VT(WS) is updated.
// The initial value of this variable is Configured_Tx_Window_size.
uint16_t vt_pdu;
// This state variable is used when the "poll every Poll_PDU PDU" polling
// trigger is configured. It shall be incremented by 1 for each AMD PDU that
// is transmitted including both new and retransmitted AMD PDUs. When it
// becomes equal to the value Poll_PDU, a new poll shall be transmitted and
// the state variable shall be set to zero.
// The initial value of this variable is 0.
uint16_t vt_sdu;
// This state variable is used when the "poll every Poll_SDU SDU" polling
// trigger is configured. It shall be incremented by 1 for a given SDU when
// the AMD PDU carrying the first segment of this SDU is scheduled to be
// transmitted for the first time. When it becomes equal to the value Poll_SDU
// a new poll shall be transmitted and the state variable shall be set to
// zero. The "Polling bit" shall be set to "1" in the first transmission of
// the AMD PDU that contains the last segment of an RLC SDU (indicated either
// by the "Length Indicator" indicating the end of the SDU or by the special
// value of the HE field).
// The initial value of this variable is 0.
uint16_t vt_rst; // Reset state variable
// This state variable is used to count the number of times a RESET PDU is
// scheduled to be transmitted before the reset procedure is completed.
// VT(RST) shall be incremented by 1 according to subclauses 11.4.2 and
// 11.4.5.1. VT(RST) shall only be reset upon the reception of a RESET ACK
// PDU ( i.e. VT(RST) shall not be reset when an RLC reset initiated by the
// peer RLC entity occurs) unless otherwise specified in subclause 9.7.7.
// The initial value of this variable is 0.
uint16_t vt_mrw; // MRW command send state variable
// This state variable is used to count the number of times a MRW command is
// transmitted. VT(MRW) is incremented by 1 each time a timer Timer_MRW
// expires. VT(MRW) shall be reset when the SDU discard with explicit
// signalling procedure is terminated.
// The initial value of this variable is 0.
uint16_t vt_ws; // transmitter window size state variable
// This state variable contains the size that shall be used for the
// transmission window. VT(WS) shall be set equal to the WSN field when the
// transmitter receives a STATUS PDU including a WINDOW SUFI.
// The initial value of this variable is Configured_Tx_Window_size.
uint16_t vr_r; // Receive state variable
// This state variable contains the "Sequence Number" following that of the
// last in-sequence AMD PDU received. It shall be updated upon the receipt of
// the AMD PDU with "Sequence Number" equal to VR(R).
// The initial value of this variable is 0. For the purpose of initialising
// the protocol, this value shall be assumed to be the first "Sequence Number"
// following the last in-sequence received AMD PDU.
uint16_t vr_h; // Highest expected state variable
// This state variable contains the "Sequence Number" following the highest
// "Sequence Number" of any AMD PDU received or identified to be missing..
// When a AMD PDU is received with "Sequence Number" x or a POLL SUFI is
// received with POLL_SN=x such that VR(H)<=x<VR(MR), this state variable
// shall be set equal to x+1.
// The initial value of this variable is 0.
uint16_t vr_mr; // Maximum acceptable Receive state variable
// This state variable contains the "Sequence Number" of the first AMD PDU
// that shall be rejected by the Receiver,
// VR(MR) = VR(R) + Configured_Rx_Window_Size..
//-----------------------------
// TIMERS
//-----------------------------
list2_t rlc_am_timer_list;
signed int timer_poll;
signed int timer_poll_init;
//This timer shall only be used when so configured by upper layers. The value
// of the timer is signalled by upper layers. In the UE this timer shall be
// started (or restarted) when the successful or unsuccessful transmission of
// a poll is indicated by lower layer. In UTRAN it should be started when a
// poll is submitted to lower layer. If x is the value of the state variable
// VT(S) after the poll was submitted to lower layer, the timer shall be
// stopped upon receiving:
// - positive acknowledgements for all the AMD PDUs with "Sequence Number"
// up to and including x - 1; or
// - a negative acknowledgement for the AMD PDU with
// "Sequence Number" = x - 1.
// If the timer expires and no STATUS PDU fulfilling the criteria above has
// been received:
// - the Receiver shall be polled once more;
// - the timer shall be restarted; and
// - the new value of VT(S) shall be saved.
// If a new poll is sent when the timer is active, the timer shall be
// restarted at the time specified above, and the value of VT(S) shall be saved.
signed int timer_poll_prohibit;
signed int timer_poll_prohibit_init;
// This timer shall only be used when so configured by upper layers. It is
// used to prohibit transmission of polls within a certain period. The value
// of the timer is signalled by upper layers.
// In the UE this timer shall be started (or restarted) when the successful or
// unsuccessful transmission of a poll is indicated by lower layer. In UTRAN
// it should be started when a poll is submitted to lower layer.
// From the time a poll is triggered until the timer expires, polling is
// prohibited. If another poll is triggered while polling is prohibited, its
// transmission shall be delayed until the timer expires
// (see subclause 9.7.1). Only one poll shall be transmitted when
// Timer_Poll_Prohibit expires even if several polls were triggered in the
// meantime. This timer shall not be affected by the reception of STATUS PDUs.
// When Timer_Poll_Prohibit is not configured by upper layers, polling is
// never prohibited.
signed int timer_discard;
signed int timer_discard_init;
// This timer shall be used when timer-based SDU discard is configured by
// upper layers. The value of the timer is signalled by upper layers. In the
// transmitter, a new timer is started upon reception of an SDU from upper
// layer.
// ...In AM, if a timer expires before the corresponding SDU is acknowledged,
// "SDU discard with explicit signalling" specified in subclause 11.6 shall be
// initiated.
signed int timer_poll_periodic;
signed int timer_poll_periodic_init;
// This timer shall only be used when "timer based polling" is configured by
// upper layers. The value of the timer is signalled by upper layers. The
// timer shall be started when the RLC entity is created. When the timer
// expires, the RLC entity shall:
// - restart the timer;
// - if AMD PDUs are available for transmission or retransmission (not yet
// acknowledged):
// - trigger a poll.
signed int timer_status_prohibit;
signed int timer_status_prohibit_init;
// This timer shall only be used when so configured by upper layers. It is
// meant to prohibit the Receiver from sending consecutive acknowledgement
// status reports. A status report is an acknowledgement status report if it
// contains any of the SUFIs LIST, BITMAP, RLIST or ACK. The value of the
// timer is signalled by upper layers.
// In the UE, this timer shall be started (or restarted) when the successful
// or unsuccessful transmission of the last STATUS PDU of an acknowledgement
// status report is indicated by lower layer. In UTRAN it should be started
// when the last STATUS PDU of an acknowledgement status report is submitted
// to lower layer.
// From the time an acknowledgement status report is triggered until the
// Timer_Status_Prohibit timer expires, acknowledgement is prohibited. If
// another such status report is triggered while acknowledgement is
// prohibited, its transmission shall be delayed until the timer expires
// (see subclause 9.7.2). The status report may be updated during this time.
// The transmission of SUFIs MRW, MRW_ACK, WINDOW or NO_MORE is not restricted.
// When Timer_Status_Prohibit is not configured by upper layers,
// acknowledgment is not prohibited.
signed int timer_status_periodic;
signed int timer_status_periodic_init;
// This timer shall only be used when timer based status reporting is
// configured by upper layers.
// This timer shall be started when the RLC entity is created. When the timer
// expires the transmission of a status report shall be triggered and the
// timer shall be restarted. This timer can be blocked by upper layers. The
// timer shall be restarted when upper layers indicate that it is no longer
// blocked.
signed int timer_rst;
signed int timer_rst_init;
// This timer is meant to handle the loss of a RESET PDU by the peer entity,
// or the loss of a RESET ACK PDU from the peer entity. The value of the timer
// is signalled by upper layers.
// In the UE this timer shall be started (or restarted) when the successful or
// unsuccessful transmission of a RESET PDU is indicated by lower layer. In
// UTRAN it should be started when a RESET PDU is submitted to lower layer.
// Timer_RST shall only be stopped upon reception of a RESET ACK PDU (with
// same RSN as RESET PDU), i.e. this timer shall not be stopped when an RLC
// reset initiated by the peer RLC entity occurs. If this timer expires, the
// RESET PDU shall be retransmitted.
signed int timer_mrw;
signed int timer_mrw_init;
// This timer is used to trigger the retransmission of a status report
// containing an MRW SUFI field. The value of the timer is signalled by upper
// layers.
// In the UE this timer shall be started (or restarted) when the successful or
// unsuccessful transmission of a STATUS PDU containing the MRW SUFI is
// indicated by lower layer. In UTRAN, it should be started when a STATUS PDU
// containing the MRW SUFI is submitted to lower layer.
// Each time the timer expires the MRW SUFI is retransmitted. It shall be
// stopped when one of the termination criteria for the SDU discard with
// explicit signalling procedure is fulfilled (see subclause 11.6.4).
//-----------------------------
// PROTOCOL PARAMETERS
//-----------------------------
uint16_t max_dat;
// The maximum number of transmissions of an AMD PDU is equal to MaxDAT – 1.
// This protocol parameter represents the upper limit for state variable
// VT(DAT). When VT(DAT) equals the value MaxDAT, either RLC RESET procedure
// or SDU discard procedure shall be initiated according to the configuration
// by upper layers.
uint16_t poll_pdu;
// This protocol parameter indicates how often the transmitter shall poll the
// Receiver in the case where "polling every Poll_PDU PDU" is configured by
// upper layers. It represents the upper limit for the state variable VT(PDU).
// When VT(PDU) equals the value Poll_PDU a poll shall be transmitted to the
// peer entity.
uint16_t poll_sdu;
// This protocol parameter indicates how often the transmitter shall poll the
// Receiver in the case where "polling every Poll_SDU SDU" is configured by
// upper layers. It represents the upper limit for state variable VT(SDU).
// When VT(SDU) equals the value Poll_SDU a poll shall be transmitted to the
// peer entity.
uint16_t poll_window;
// This protocol parameter indicates when the transmitter shall poll the
// Receiver in the case where "window-based polling" is configured by upper
// layers. A poll is triggered for each AMD PDU when J >= Poll_Window, where
// J is the transmission window percentage.(see formula of J in spec document)
uint16_t max_rst;
// The maximum number of transmissions of a RESET PDU is equal to MaxRST – 1.
// This protocol parameter represents the upper limit for state variable
// VT(RST). When VT(RST) equals the value MaxRST, unrecoverable error shall be
// indicated to upper layers.
uint16_t configured_tx_window_size;
// This protocol parameter indicates both the maximum allowed transmission
// window size and the value for the state variable VT(WS).
//uint16_t configured_rx_window_size;
// This protocol parameter indicates the reception window size. This parameter
// is applicable both for RLC UM and AM. This parameter is only configured for
// RLC-UM in case out-of-sequence reception is supported.
uint16_t max_mrw;
// The maximum number of transmissions of an MRW command is equal to MaxMRW.
// This protocol parameter represents the upper limit for state variable
// VT(MRW). When VT(MRW) equals the value MaxMRW, the RLC RESET procedure
// shall be initiated.
uint16_t first_li_in_next_pdu; // indicates :
// value = 000000000000000 that the previous PDU was exactly
// with the last segment of an RLC SDU and there is no LI that
// indicates the end of the SDU in the previous RLC PDU.
// value = 111111111111011 The last segment of an RLC SDU was one octet
// short of exactly filling the previous RLC PDU and there is no LI that
// indicates the end of the SDU in the previous RLC PDU. The remaining one
// octet in the previous RLC PDU is ignored.
// value = 111111111111110 AMD PDU: The rest of the RLC PDU includes a
// piggybacked STATUS PDU.
// value = 111111111111111 The rest of the RLC PDU is padding. The padding
// length can be zero.
//-----------------------------
// C-SAP
//-----------------------------
list_t c_sap;
//-----------------------------
// discard
//-----------------------------
uint8_t sdu_discard_mode;
uint8_t send_mrw;
//-----------------------------
// tranmission
//-----------------------------
mem_block_t **input_sdus; // should be accessed as an array
mem_block_t *input_sdus_alloc; // allocation of the array
uint16_t size_input_sdus_buffer;
uint16_t nb_sdu;
uint16_t next_sdu_index; // next location of incoming sdu
uint16_t current_sdu_index;
uint32_t buffer_occupancy;
// for segmentation procedures (optimization save space on stack)
uint16_t li[RLC_AM_SEGMENT_NB_MAX_LI_PER_PDU];
// implementation specific: our transmiter buffer is an array whose size must be a power of 2
uint16_t recomputed_configured_tx_window_size;
mem_block_t *(*rlc_segment) (struct rlc_am_entity * rlcP);
mem_block_t *retransmission_buffer_alloc;
mem_block_t **retransmission_buffer;
list2_t retransmission_buffer_to_send; // contains PDUs that must be immediatly retransmitted
list_t control; // contains control pdus
uint16_t nb_pdu_requested_by_mac_on_ch1;
uint16_t nb_pdu_requested_by_mac_on_ch2;
uint16_t pdu_size;
uint8_t li_one_byte_short_to_add_in_next_pdu;
uint8_t li_exactly_filled_to_add_in_next_pdu;
list_t pdus_to_mac_layer_ch1;
list_t pdus_to_mac_layer_ch2;
//-----------------------------
// receiver
//-----------------------------
sdu_size_t output_sdu_size_to_write;
mem_block_t *output_sdu_in_construction;
mem_block_t *receiver_buffer_alloc;
mem_block_t **receiver_buffer;
uint16_t last_reassemblied_sn;
uint16_t configured_rx_window_size;
uint16_t recomputed_configured_rx_window_size;
list_t pdus_from_mac_layer_ch1;
list_t pdus_from_mac_layer_ch2;
//-----------------------------
// status generation
//-----------------------------
mem_block_t *holes_alloc;
struct rlc_am_hole *holes;
uint16_t nb_missing_pdus;
uint16_t ack_sn;
uint16_t nb_holes;
# ifdef BYPASS_L1
unsigned int pdu_counter;
# endif
unsigned int stat_tx_pdcp_sdu;
unsigned int stat_tx_pdcp_sdu_discarded;
unsigned int stat_tx_retransmit_pdu_unblock;
unsigned int stat_tx_retransmit_pdu_by_status;
unsigned int stat_tx_retransmit_pdu;
unsigned int stat_tx_data_pdu;
unsigned int stat_tx_control_pdu;
unsigned int stat_rx_sdu;
unsigned int stat_rx_error_pdu;
unsigned int stat_rx_data_pdu;
unsigned int stat_rx_data_pdu_out_of_window;
unsigned int stat_rx_control_pdu;
};
# endif
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