Dynamic algorithms for WLAN-cellular performance estimation, access selection, and traffic offload
First Claim
1. A method comprising:
- obtaining a connection status of a user equipment (UE) in a wireless network for each radio access link, wherein the UE is capable of connecting to both a cellular radio access link and a WLAN radio access link;
determining corresponding radio access throughput for at least one of the cellular and the WLAN link based on the corresponding connection status, wherein the radio access throughput is measured if the UE is connected with corresponding radio access link, otherwise, the radio access throughput is estimated, and wherein the measuring the radio access throughput involves;
measuring a channel utilization, estimating a device throughput based on the measured channel utilization level and measurements of MAC-to-PHY overheads, and obtaining the throughput by looking up a throughput estimator table indexed by the channel utilization and the estimated device throughput;
determining corresponding wide area network (WAN) throughput for the cellular and the WLAN link; and
determining corresponding end-to-end throughput for the cellular and the WLAN link based on the corresponding radio access throughput and WAN throughput.
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Abstract
Methods and apparatus are provided to measure, estimate throughput of wireless network for traffic offload. In one novel aspect, the UE determines the association status of a radio access network (RAN). The UE measures or estimates the end-to-end throughput of the RAN. In one embodiment, non-intrusive estimation by QoS probing request is used. In another embodiment, direct measurement with modeling is used. The modeling uses admission control/scheduling. In another embodiment, estimation or probing the metrics with or without modeling is used with either in-band probing or non-intrusive probing. In yet another embodiment, the throughput is obtained based on network signaling messages. In another novel aspect, the UE selects a dynamic measurement or estimation algorithm based on the association status and the QoS type of the traffic. Admission control procedure or binary admission procedure is used with the initial bandwidth request based on association status.
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Citations
19 Claims
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1. A method comprising:
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obtaining a connection status of a user equipment (UE) in a wireless network for each radio access link, wherein the UE is capable of connecting to both a cellular radio access link and a WLAN radio access link; determining corresponding radio access throughput for at least one of the cellular and the WLAN link based on the corresponding connection status, wherein the radio access throughput is measured if the UE is connected with corresponding radio access link, otherwise, the radio access throughput is estimated, and wherein the measuring the radio access throughput involves;
measuring a channel utilization, estimating a device throughput based on the measured channel utilization level and measurements of MAC-to-PHY overheads, and obtaining the throughput by looking up a throughput estimator table indexed by the channel utilization and the estimated device throughput;determining corresponding wide area network (WAN) throughput for the cellular and the WLAN link; and determining corresponding end-to-end throughput for the cellular and the WLAN link based on the corresponding radio access throughput and WAN throughput. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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obtaining an association status of a user equipment (UE) in a wireless network for each radio access link, wherein the UE is capable of connecting to both a first radio access link and a second radio access link; determining a quality of service (QoS) requirement for a traffic flow of the UE; and estimating and comparing throughputs of the first radio access link and the second radio access link based on the association status and the QoS requirement; and determining traffic offloading and traffic steering between the first and the second radio access link based on the obtained estimation and throughput comparison, wherein the traffic offloading and traffic steering are hieratically structured such that higher QoS traffic flows are considered for offloading before lower QoS traffic flows, and wherein the estimation and the comparison of throughputs of the first and the second radio access link are performed iteratively for each traffic flow of the UE, and wherein estimated parameters are updated for each iteration. - View Dependent Claims (10)
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11. A user equipment (UE) comprising:
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a first transceiver that transmits and receives radio signals via a first radio access link; a second transceiver that transmits and receives radio signals via a second radio access link; a connection status module that determines corresponding connection status for each radio access link; and a radio access link throughput module that determines corresponding radio access throughput for at least one of the first and the second radio access link based on the corresponding connection status, wherein the radio access throughput is measured if the UE is connected with corresponding radio access link, otherwise, the radio access throughput is estimated, and wherein the radio access link throughput module estimates the radio access throughput uses an admission control procedure with an estimated initial bandwidth and QoS request for a probing purpose. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification