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QoS Handling: implement intelligent QoS-to-DRB mapping based on 3GPP TS 23.501

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Implement QoS flow multiplexing logic that optimizes DRB usage by classifying
5QI values per 3GPP TS 23.501 Table 5.7.4-1 and applying resource-type-aware
multiplexing limits. The changes are adopted in nr_rrc_add_bearers, which
is the RRC function responsible for adding PDU Sessions and DRBs in RRC.

Key features:
- Classify 5QI by resource type (DC-GBR, GBR, Non-GBR)
- Reuse existing DRBs when QoS characteristics are compatible
- Dedicated DRBs for DC-GBR (5QI 82-90) and high-priority services
- Per-type multiplexing limits: DC-GBR=1, GBR=2, Non-GBR=5
- Aggregate cap: max 5 flows per DRB

Implementation:
- nr_rrc_get_5qi_resource_type():
  Maps 5QI values to resource types using lookup table.
  DC-GBR: 5QI 82-90, GBR: 5QI 1-4,65-67,71-76, Non-GBR: 5QI 5-11,69-70,79-80.
  Unknown 5QIs default to Non-GBR with warning.

- nr_rrc_qos_dedicated_drb():
  Identifies 5QIs requiring isolated DRBs (high priority, low-PER).
  Includes: DC-GBR: 5QI 82-90, 5QI 4,6-10 (video), 5QI 70 (mission-critical),
  5QI 71-73 (live streaming), 5QI 80 (low-latency).

- nr_rrc_count_qos_flows_by_type():
  Counts QoS flows mapped to a specific DRB, grouped by resource type.
  Used to check capacity and enforce multiplexing limits.

- nr_rrc_find_suitable_drb_for_qos():
  Searches existing DRBs in the same PDU session for available capacity.
  Checks resource type compatibility, per-type limits, and aggregate cap.
  Returns DRB ID if suitable, -1 if new DRB needed.
  DC-GBR flows always return -1 (require dedicated DRB).

- nr_rrc_assign_drb_to_qos_flow(), which either reuses a DRB
  selected by nr_rrc_find_suitable_drb_for_qos() or creates a new DRB via
  nr_rrc_add_drb, assigns its ID to the QoS flow

Note: this commit is multi-QoS ready.

Signed-off-by: Guido Casati <guido.casati@openairinterface.org>
This commit is contained in:
Guido Casati
2025-08-29 14:56:04 +02:00
parent 302c1c0450
commit 8ceb7ec37b
3 changed files with 238 additions and 9 deletions
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8
common/5g_platform_types.h
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@@ -36,6 +36,14 @@ typedef enum {
typedef enum { NON_DYNAMIC, DYNAMIC } fiveQI_t;
/* 5QI (5G QoS Identifier) - 3GPP TS 23.501 §5.7.2.1
* Range: 0..255
* - Standardized 5QI values: have one-to-one mapping to standardized 5G QoS characteristics (Table 5.7.4-1)
* - Pre-configured 5QI values: pre-configured in the AN
* - Dynamically assigned 5QI values: require signaling of QoS characteristics as part of QoS profile */
#define MIN_FIVEQI 0
#define MAX_FIVEQI 255
/* ARP Priority Level - 3GPP TS 23.501 §5.7.2.2
* The ARP priority level defines the relative importance of a QoS Flow.
* Range: 1 to 15, with 1 as the highest priority.