QoS provisioning for LTE-WLAN aggregation
LTE-WLAN aggregation (LWA) at the radio access network level promises significant gain in system capacity and user quality of experience (QoE). In order to support QoS over LWA, there is a need to develop mechanisms to ensure that the access category (AC) classification chosen by a wireless device (AP in the case of downlink, and UE in case of uplink) is consistent with the QoS requirements of the EPS bearer/DRB and/or subscriber profile to which the traffic belongs. The cellular LTE network can provision QoS for both downlink and uplink data flows that are transferred using LWA access.
1. A method comprising:
establishing a data radio bearer (DRB) with a base station by a user equipment (UE) in a wireless network, wherein the DRB corresponds to an evolved packet system (EPS) bearer associated with a QoS Class Identifier (QCI);
receiving LTE-WLAN aggregation (LWA) configuration from the base station, wherein the UE is connected with both the base station and an LWA-enabled access point (AP);
receiving access category (AC) information from the network for determining an AC value based on the AC information; and
performing a channel contention procedure using the AC value and transmitting a data packet to the AP upon winning the channel contention.
2. The method of claim 1 , wherein the UE receives the AC information via radio resource control (RRC) signaling from the base station.
3. The method of claim 2 , wherein the AC information comprises a specific AC value per DRB per UE.
4. The method of claim 1 , wherein the AC information comprises the QCI, and wherein the UE maps the QCI to the AC value based on AC mapping information.
5. The method of claim 4 , wherein the UE receives the QCI during bearer setup via a Non-Access Stratum (NAS) signaling message.
6. The method of claim 5 , wherein the UE receives updated QCI using a NAS layer EPS bearer modification process.
7. The method of claim 4 , wherein the UE receives the AC mapping information from a dedicated radio resource control (RRC) signaling.
8. The method of claim 4 , wherein the UE receives the AC mapping information from a broadcast signaling message.
9. The method of claim 4 , wherein the UE performs the mapping using a static mapping table.
10. The method of claim 1 , wherein the data packet is associated with an IP flow, and wherein the UE maps the IP flow to the AC value using Access Network Discovery and Selection Function (ANDSF).
11. A User Equipment (UE), comprising:
a radio bearer handler that establishes a data radio bearer (DRB) with a base station in a wireless network, wherein the DRB corresponds to an evolved packet system (EPS) bearer associated with a QoS Class Identifier (QCI);
an LTE-WLAN aggregation (LWA) configurator that configures LWA based on LWA configuration received from the base station, wherein the UE is connected with both the base station and an LWA-enabled access point (AP);
a receiver that receives access category (AC) information from the network for determining an AC value based on the AC information; and
a transmitter that transmits a data packet to the AP upon winning a channel contention after performing a channel contention procedure using the AC value.
12. The UE of claim 11 , wherein the UE receives the AC information via radio resource control (RRC) signaling from the base station.
13. The UE of claim 12 , wherein the AC information comprises a specific AC value per DRB per UE.
14. The UE of claim 11 , wherein the AC information comprises the QCI, and wherein the UE maps the QCI to the AC value based on AC mapping information.
15. The UE of claim 14 , wherein the UE receives the QCI during bearer setup via a Non-Access Stratum (NAS) signaling message.
16. The UE of claim 15 , wherein the UE receives updated QCI using a NAS layer EPS bearer modification process.
17. The UE of claim 14 , wherein the UE receives the AC mapping information from a dedicated radio resource control (RRC) signaling message.
18. The UE of claim 14 , wherein the UE receives the AC mapping information from a broadcast signaling message.
19. The UE of claim 14 , wherein the UE performs the mapping using a static mapping table.
20. The UE of claim 11 , wherein the data packet is associated with an IP flow, and wherein the UE maps the IP flow to the AC value using Access Network Discovery and Selection Function (ANDSF).