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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
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
-37
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@@ -1,37 +0,0 @@
#######################################
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
-531
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@@ -1,531 +0,0 @@
/*******************************************************************************
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