Network Selection and Data Aggregation with LTE-WLAN Aggregation

• US 20160234726A1
• Filed: 02/04/2016
• Published: 08/11/2016
• Est. Priority Date: 02/05/2015
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Nuggehalli, Pavan Santhana Krishna, Hsu, Chia-Chun, Chou, Chie-Ming
• Granted Patent: US 9,788,242 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 36/0094 Definition of hand-off measurement parameters
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

Apparatus and methods are provided for selection and data aggregation for the LWA. In one novel aspect, the UE connected with a first RAN receives a LWA assistance configuration and selects a second RAN based on the LWA assistance configuration. The UE aggregates data traffic from the first RAN and the selected second RAN. In one embodiment, the information request-and-response procedure is used, which allows the first RAN to query the UE about its second RAN association status. In another embodiment, the selection request-and-response procedure is used, which allows the first RAN to exercise some control over which base station of the second RAN is selected by the UE and for the UE to send relevant information about its second RAN connectivity to the first RAN. In another novel aspect, the UE selects a DRB based on the LWA DRB configuration through either a NAS procedure or an operator configuration.

Claims

1. A method comprising:

receiving a LTE-WLAN aggregation (LWA) assistance configuration by a user equipment (UE) in a wireless network, wherein the UE is connected with a first radio access network (RAN);

selecting a second RAN based on the LWA assistance configuration; and

aggregating data traffic at least between the first RAN and the second RAN.

2. The method of claim 1, wherein the first RAN is LTE, the second RAN is WLAN, and wherein the LWA assistance configuration includes at least one information element comprising:

a list of LWA-enabled WLAN APs, a list of LWA-enabled WLAN APs with the type of LWA access supported, a list of prioritized LWA-enabled WLAN APs, and one or more threshold values for selecting a WLAN AP.

3. The method of claim 2, wherein each of the LWA-enabled WLAN APs is identified by an identification comprising a SSID, a BSSID, and a HESSID.

4. The method of claim 2, wherein the LWA-enabled WALN APs are prioritized based on one or more conditions comprising a backhaul capability, a network status, a WLAN AP load, a version of 802.11 supported, a support capability of IEEE and WFA features.

5. The method of claim 2, wherein the threshold values comprises a WLAN channel utilization, a backhaul rate, a beacon RSSI value, a RSRP value of the first RAN, and a RSQ value of the first RAN.

6. The method of claim 1, wherein the LWA assistance configuration includes a measurement report configuration, and wherein the UE sends a LWA measurement report based on the LWA assistance configuration.

7. The method of claim 6, wherein the measurement report configuration include at least one element comprising:

a list of base stations of the second RAN to scan, a list of frequency of the second RAN to scan, and a measurement report triggering scheme.

8. The method of claim 1, further comprising:

receiving a LWA second RAN information request from the first RAN; and

sending a LWA second RAN information response to the first RAN.

9. The method of claim 8, wherein the first RAN is LTE, the second RAN is WLAN, and wherein the LWA second RAN information response includes one or more response information elements comprising:

a WLAN association status, an identification of an associated WLAN AP, an IP address of the UE associated with the connected WLAN AP, a summary of a WLAN statistics, and a rejection response indicating no connection attempt to a WLAN AP with one or more optional cause code.

10. The method of claim 1, wherein the first RAN is LTE, the second RAN is WLAN, further comprising:

receiving a LWA WLAN selection request from the first RAN, and wherein the selection request includes one or more selection request elements comprising;

a list candidate WLAN APs, a list of prohibited WLAN APs, an association timer value for the association of a WLAN AP, an indication of disabling LWA WLAN access, and a disable timer value indicating a period for LWA WLAN disabling;

selecting a WLAN AP further based on the LWA WLAN selection request; and

sending a LWA WLAN selection response to the first RAN, wherein the selection response includes one or more selectin response elements comprising;

a status of a WLAN association attempt, diagnostic information of an association failure, and an indication of rejection of a WLAN association with an optional cause code.

11. A method, comprising:

obtaining a LTE-WLAN aggregation (LWA) dedicated radio bearer (DRB) configuration by a user equipment (UE) in a wireless network wherein the UE is connected with a first radio access network (RAN);

selecting a second RAN, wherein the UE aggregates data traffic between at least the first RAN and the second RAN; and

informing the first RAN of a bearer-eligibility for a LWA access based on the LWA DRB configuration.

12. The method of claim 11, wherein the LWA DRB configuration is obtained through a non-access stratum (NAS) layer of the wireless network.

13. The method of claim 12, wherein the LWA DRB configuration indicates an allowability of all evolved packet system (EPS) bearers, and wherein the UE receives the LWA DRB configuration through a NAS EPS mobility management (EMM) procedure using at least one of NAS messages comprising an ATTACH ACCEPT message, and a TAU ACCEPT message.

14. The method of claim 12, wherein the LWA DRB configuration indicates a LWA eligibility of one or more specific EPS bearers, and wherein the UE receives the LWA DRB configuration through a NAS session management (ESM) procedure.

15. The method of claim 11, wherein the LWA DRB configuration is obtained based on an IP flow configuration configured by at least one settings comprising:

an operator configuration through open mobile alliance (OMA) device management (DM) procedures, and a pre-configuration on the UE.

16. An user equipment (UE) connecting with a first radio access network (RAN) in a wireless communication network, comprising:

a radio frequency (RF) transceiver that transmits and receives radio signals in the wireless communication network;

a LTE-WLAN aggregation (LWA) assistance configurator that configures a LWA assistance configuration;

a selector that selects a second RAN based on the LWA assistance configuration; and

an aggregator that aggregates data traffic at least among the first RAN and the second RAN.

17. The UE of claim 16, wherein the first RAN is LTE, the second RAN is WLAN, and wherein the LWA assistance configuration includes at least one information element comprising:

a list of LWA-enabled WLAN APs, a list of LWA-enabled WLAN APs with the type of LWA access supported, a list of prioritized LWA-enabled WLAN APs, and one or more threshold values for selecting a WLAN AP.

18. The UE of claim 16, wherein the LWA assistance configuration includes a measurement report configuration, and wherein the UE sends a LWA measurement report based on the LWA assistance configuration.

19. The UE of claim 16, further comprising:

a LWA dedicated radio bearer (DRB) configurator that obtains a LWA DRB configuration.

20. The UE of claim 19, wherein the LWA DRB configuration is obtained through a non-access stratum (NAS) layer of the wireless network.

21. The UE of claim 19, wherein the LWA DRB configuration indicates an allowability of all evolved packet system (EPS) bearers, and wherein the UE receives the LWA DRB configuration through a NAS EPS mobility management (EMM) procedure using at least one of NAS messages comprising an ATTACH ACCEPT message, and a TAU ACCEPT message.

22. The UE of claim 19, wherein the LWA DRB configuration indicates a LWA eligibility of one or more specific EPS bearers, and wherein the UE receives the LWA DRB configuration through a NAS session management (ESM) procedure.

23. The UE of claim 19, wherein the LWA DRB configuration is obtained based on an IP flow configuration configured by at least one settings comprising:

an operator configuration through open mobile alliance (OMA) device management (DM) procedures, and a pre-configuration on the UE.