Patent Application
20180324655
This invention generally relates to traffic steering between two or more networks and more particularly to providing information to at least one of the networks to facilitate the traffic steering process.
Many wireless communication systems use base stations or access points to provide geographical service areas where wireless communication user equipment (UE) devices communicate with the base station or access point providing the particular geographical service area in which the wireless communication UE devices are located. The base stations and access points are connected within a network allowing communication links to be made between the wireless communication UE devices and other devices. In some circumstances, the wireless communication UE devices are capable of communicating on more than one type of network. In these situations, it may be advantageous to obtain data to help inform a decision regarding which network a wireless communication UE device should use to transmit and receive data traffic.
In the systems and methods described herein, a first radio network determines one or more network-related parameter thresholds that will be provided to the user equipment (UE) devices. More specifically, a base station of the first radio network determines the network-related parameter threshold values based, at least partially, on an indication that user data traffic of one or more UE devices has been handed over from a second radio network. For example, based on the indication that all or a portion of user data traffic of a UE device is being handed over from the second radio network, the base station may determine that more traffic should be offloaded to the second radio network. The base station can modify the network-related parameter threshold values that are being sent to the one or more UE devices so that more traffic is offloaded. Similarly, the base station may determine that less traffic should be offloaded to the second radio network, based on the indication that all or a portion of user data traffic of a UE device is being handed over from the second radio network. In this case, the base station can modify the network-related parameter threshold values that are being sent to the one or more UE devices so that less traffic is offloaded.
Due to the increasing demands for wireless bandwidth, mobile network (cellular) operators are interested in offloading data traffic from their mobile networks to other networks that are capable of handling the data traffic from one or more of the mobile wireless communication user equipment devices (UE devices) that are being served by the mobile network. A wireless local area network (WLAN), such as those based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specification, is one example of a network that can handle the data traffic from one or more of the UE devices, if certain conditions are met. The offloading of data traffic to the WLAN can help a mobile network from becoming too congested and affecting the level of service that the mobile network can provide to the UE devices being served by the mobile network.
Standards organizations such as 3rd Generation Partnership Project (3GPP) are incorporating procedures in the communications standards to facilitate offloading/onloading traffic between a 3GPP Long-Term Evolution (LTE) Radio Access Network (RAN) and a WLAN. Although the systems and methods disclosed herein refer specifically to offloading/onloading traffic between the 3GPP RAN and a WLAN by providing the base station of a 3GPP RAN with an indication that all or a portion of user data traffic of a UE device is being handed over from another network (e.g., WLAN), it is contemplated that the systems and methods could be modified such that the access point of a WLAN radio network is provided an indication that the UE device has been handed over from the 3GPP RAN. Likewise, the systems and methods disclosed herein could be modified to be used in conjunction with any suitable wireless communication networks other than a 3GPP RAN and a WLAN.
For traffic routing (e.g., steering) UE data traffic between the 3GPP RAN and a WLAN, the 3GPP standard defines thresholds for parameters related to 3GPP RAN and WLAN. These thresholds assist UE devices in making traffic routing decisions (e.g., whether to route data traffic over the 3GPP RAN or over the WLAN). The base station (eNB) of the 3GPP RAN provides the thresholds to UE devices either by broadcast signaling or by unicast signaling. Both low (e.g., minimum) and high (e.g., maximum) thresholds are provided in order to assist the UE devices with network selection in both directions. In the systems and methods described herein, the UE devices make the traffic routing decisions. However, it is contemplated that the traffic routing decisions could be made by any other suitable system entities (e.g., base stations, access points, etc.) that have access to the required parameter threshold information and to the current values of the parameters related to the 3GPP RAN and the WLAN.
The 3GPP RAN-related parameters used to make the traffic routing decisions are radio strength measurements, which include: the UE RSRPmeas (Reference Signal Received Power measurements) and the UE RSRQmeas (Reference Signal Received Quality measurements). The WLAN-related parameters used to make the traffic routing decisions include: a list of WLAN identifiers that may be considered for traffic offloading, UE measurement of the Beacon Received Signal Strength Indicator (WLANRSSI), WLAN Channel Utilization (ChannelUtilizationWLAN), the WLAN backhaul downlink data rate (BackhaulRateDIWLAN), and the WLAN backhaul uplink data rate (BackhaulRateUIWLAN). Current values of each of the 3GPP RAN-related parameters and the WLAN-related parameters may be obtained by the UE by various methods: the UE may measure received signals for various characteristics, the values may be broadcast/unicast from the 3GPP RAN eNB and/or an access point/base station of the WLAN, or the values may be transmitted in response to a query by the UE.
The systems and methods described herein may be modified to utilize various combinations of the different network-related parameters, such combinations also possibly using a greater or lesser number of parameters than the specific example set forth above. For example, other WLAN-related parameters that may be useful in determining appropriate threshold levels may include: Basis Service Set (BSS) Load, UE Average Data Rate, BSS Average Access Delay, and BSS Access Controller Access Delay. Moreover, any other suitable network-related parameters not specifically listed here may be utilized to inform the traffic routing decision.
Once the UE has the parameter threshold values and current values of the 3GPP RAN-related parameters and the WLAN-related parameters, the UE can compare the current parameter values to the threshold values, and under certain conditions, the UE will be triggered to make a traffic routing decision. In making the traffic routing decision, the UE also utilizes a persistence time, t-SteeringWLAN, which specifies a duration of time (e.g., a timer value) during which the conditions should be met before considering traffic steering between the 3GPP RAN and a WLAN. For example, when steering traffic from the 3GPP RAN to the WLAN, Conditions 1 and 2 must both be met for a time interval equal to or greater than the persistence time, t-SteeringWLAN. In order for Condition 1 to be met, either Condition 1a or Condition 1b must be met. In order for Condition 2 to be met, Conditions 2a-2d must all be met.
When steering traffic from a WLAN to the 3GPP RAN, Condition 3 or Condition 4 must be met for a time interval equal to or greater than the persistence time, t-SteeringWLAN. In order for Condition 3 to be met, Condition 3a and Condition 3b must be met. In order for Condition 4 to be met, at least one of Conditions 4a-4d must be met.
In the systems and methods described herein, the 3GPP RAN determines the thresholds that will be provided to the UE devices. More specifically, an eNB of the 3GPP RAN determines the network-related parameter threshold values based, at least partially, on an indication that user data traffic of one or more UE devices is being handed over from another network (e.g., WLAN). For example, based on the indication from the core network that all or a portion of user data traffic of a UE device is being handed over from another network, the eNB may determine that more traffic should be offloaded to the WLAN. The eNB can modify the network-related parameter threshold values that are being sent to the one or more UE devices so that more traffic is offloaded. Similarly, the eNB may determine that less traffic should be offloaded to the WLAN, based on the indication that user data traffic of one or more UE devices is being handed over from another network (e.g., WLAN). In this case, the eNB can modify the network-related parameter threshold values that are being sent to the one or more UE devices so that less traffic is offloaded.
Alternatively, the systems and methods disclosed herein may be modified so that other entities (e.g., other 3GPP entities, WLAN entities, or the UE devices) may determine, based on the indication that user data traffic of one or more UE devices has been handed over from another network, the thresholds to be used when making traffic routing decisions.
The various functions and operations of the blocks described with reference to the system 100 in
The 3GPP LTE communication specification is a specification for systems where base stations (eNBs) provide service to UE devices using orthogonal frequency-division multiplexing (OFDM) on the downlink and single-carrier frequency-division multiple access (SC-FDMA) on the uplink. Although the techniques described herein may be applied in other types of communication systems, the exemplary systems discussed herein operate in accordance with a 3GPP LTE communication specification.
Base station (eNB) 102 provides wireless service to UE device 104 via reference point Uu. Although not explicitly shown in
The base station 102 is a fixed transceiver station, sometimes referred to as an eNodeB or eNB.
The base station 102 additionally includes a wireless receiver 208 configured to receive wireless signals from UE device 104. Although not shown, base station 102 also comprises a wired interface capable of communicating with the 3GPP Core Network (e.g., a Mobility Management Entity and a Serving Gateway) via a backhaul. The base station is further configured to receive a setup request message (e.g.,
The base station 102 additionally includes a wireless transmitter 206 configured to transmit wireless signals to UE device 104. The wireless transmitter 206 is further configured to transmit a control message (e.g.,
Regardless of the exact configuration of base station 102, transmissions from the base station 102 and from the UE device 104 are governed by a communication specification that defines signaling, protocols, and parameters of the transmission. The communication specification may provide strict rules for communication and may also provide general requirements where specific implementations may vary while still adhering to the communication specification. Although the discussion below is directed to the 3GPP Long Term Evolution (LTE) communication specification, other communication specifications may be used in some circumstances. The communication specification defines at least a data channel and a control channel for uplink and downlink transmissions and specifies at least some timing and frequency parameters for physical downlink control channels from a base station to a wireless communication device.
The wireless UE device 104 may be referred to as a mobile device, a wireless device, a wireless communication device, a mobile wireless device, a mobile wireless communication device, a UE, a UE device, as well as by other terms.
The UE device 104 further includes a wireless transmitter 306 configured to transmit wireless signals to base station 102 and TWAN 106. The wireless transmitter 306 is further configured to transmit a request for radio resources associated with a first radio network, the request containing a parameter indicating that all or a portion of user data traffic of the mobile wireless communication device is to be handed over from a second radio network. In the example shown in
The UE device 104 additionally includes a wireless receiver 308 configured to receive wireless signals from base station 102 and TWAN 106. The wireless receiver 306 is further configured to receive a control message establishing the requested radio resources. Although
Regardless of the exact configuration of UE device 104, the UE device 104 includes electronics and code for communicating with base stations, WLAN access points, and with other wireless communication devices in device-to-device (D2D) configurations. The wireless communication device can include devices such as cell phones, smartphones, tablets, wireless modem cards, wireless modems, televisions with wireless communication electronics, and laptop and desktop computers, as well as other devices. The combination of wireless communication electronics with an electronic device, therefore, may form a wireless communication device 104. For example, a wireless communication device may include a wireless modem connected to an appliance, computer, television, or pool controller.
Although only one UE device is shown in
When the current measured values of the network-related parameters change relative to the relevant threshold values, user data traffic of the UE devices may be handed over from one network to another. For example, a comparison of the current values of the network-related parameters to the relevant threshold values may dictate that user data traffic of a UE device be handed over from TWAN 106 to eNB 102. When such a handover is to occur, eNB 102 is given an indication that user data traffic of the UE device is being handed over from TWAN 106.
Although system 100 is shown to provide an indication to eNB 102 regarding which user data traffic of a UE device is to be handed over from a non-3GPP network (e.g., TWAN 106) in accordance with the LTE specifications, the system 100 can be modified so that the indication can be provided to eNB 102 regarding which user data traffic of a UE device is to be handed over from any other additional neighboring radio networks (e.g., a WLAN other than TWAN 106). More specifically, the indication could be modified to identify one specific network from which the user data traffic of a UE device is to be handed over when there are multiple neighboring radio networks. Alternatively, the indication could merely inform the eNB that the user data traffic of a UE device is to be handed over from one of the multiple neighboring radio networks without specifically identifying the specific network from which the UE device was handed over.
Regardless of the technique utilized to provide an indication to the eNB 102 regarding which user data traffic of a UE device is to be handed over from the TWAN 106, the eNB 102 determines, based on the indication, one or more threshold values to send to the UE devices in communication with the eNB 102 so the UE devices can determine whether to route their data traffic over the 3GPP RAN or the WLAN. More specifically, controller 204 of eNB 102 is configured to determine, based at least partially on the indication, at least one network-related parameter threshold value to send to the UE devices.
In system 100, eNB 102 provides the threshold values to UE device 104. For example, transmitter 206 of eNB 102 is configured to transmit the at least one network-related parameter threshold value to one or more UE devices. In cases in which there are multiple UE devices being served by eNB 102, eNB 102 can selectively broadcast/unicast the threshold values to (1) all of the UE devices being served by eNB 102, (2) more than one, but less than all, of the UE devices being served by eNB 102, (3) UE devices that have had user data traffic handed over from any other network, (4) UE devices that have had user data traffic handed over from another, specifically-identified network (e.g., TWAN 106), (5) UE devices that have not had user data traffic handed over from another network, or (6) any combination of the foregoing options.
In system 100, eNB 102 provides the same threshold values to all of the UE devices being served by eNB 102. However, system 100 can be modified so that eNB 102 provides one or more of the UE devices with different threshold values to use in making steering decisions. For example, UE devices that have had user data traffic handed over from TWAN 106 may have different threshold levels for being steered back to TWAN 106 than UE devices that did not have user data traffic handed over from TWAN 106. By providing differentiated threshold levels, eNB 102 has a greater degree of control in affecting the steering decisions made by the UE devices being served by eNB 102.
Regardless of which thresholds have been provided to the various UE devices being served by eNB 102, UE device 104 selects one of the first radio network (e.g., 3GPP RAN) and the second radio network (e.g., TWAN 106) to use to transmit data traffic, based on a comparison between the at least one threshold value received from eNB 102 and one or more current values of various network-related parameters described above. In the example shown in
In the 3GPP specifications, the purpose of the “Request Type” IE is to indicate whether the UE requests to establish a new connectivity to a PDN or keep the connection to which it has connected via non-3GPP access. In this case, the same PDN connection is used whether the radio access technology is WLAN or 3GPP RAN, and a portion or all of the user data traffic for the existing PDN connection of UE device 104 is to be handed over from WLAN to 3GPP RAN.
Upon receiving the PDN Connectivity Request message 402, the MME 108 allocates a Bearer Identification (ID) and sends a Create Session Request message 404 to the Serving Gateway (GW) 110. A “HANDOVER INDICATION” IE is included in the Create Session Request message 404 if the “Request Type” IE of the PDN Connectivity Request message 402 is set to “HANDOVER.” Upon receiving the Create Session Request message 404 from the MME 108, Serving Gateway 110 forwards the Create Session Request message 404 on to the PDN Gateway (P-GW) 112.
In response to the Create Session Request message 404, the P-GW 112 sends a Create Session Response message 406 to the Serving GW 110. The Serving GW 110 forwards the Create Session Response message 406 to the MME 108.
Upon receiving the Create Session Response message 406, the MME 108 sends an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) Radio Access Bearer (E-RAB) Setup Request message 408 to the eNB 102 in order to set up the radio resources that are required to grant the PDN Connectivity Request 402 that was sent by the UE device 104. The E-RAB Setup Request message 408 includes a PDN Connectivity Accept message to be forwarded to the UE device 104. The E-RAB Setup Request message 408 also includes a “HANDOVER INDICATION” parameter if the “Request Type” IE of the PDN Connectivity Request message 402 was set to “HANDOVER” in accordance with an embodiment of the invention.
The eNB 102 sends a Radio Resource Control (RRC) Connection Reconfiguration message 410 to the UE device 104 to establish the radio resources required to grant the PDN Connectivity Request 402 that was sent by the UE device 104. The RRC Connection Reconfiguration message 410 includes the PDN Connectivity Accept message from the MME 108. Upon completion of the RRC Connection Reconfiguration, the UE device 104 sends an RRC Connection Reconfiguration Complete message 412 to the eNB 102. After receiving the RRC Connection Reconfiguration Complete message 412, the eNB 102 sends an E-RAB Setup Response message 414 to the MME 108.
The UE device 104 also sends a PDN Connectivity Complete message 416 to the eNB 102, which forwards the PDN Connectivity Complete message 416 to the MME 108. Upon receiving the PDN Connectivity Complete message 416, the MME 108 sends a Modify Bearer Request message 418 to the Serving GW 110. The Serving GW 110 forwards the Modify Bearer Request message 418 on to the P-GW 112. In response to the Modify Bearer Request message 418, the P-GW 112 sends a Modify Bearer Response message 420 to the Serving GW 110, which forwards the Modify Bearer Response message 420 to the MME 108.
In the example of
However, the method could be modified so that the first radio network is a network other than a 3GPP RAN and that the second radio network is a network other than a WLAN. Additionally, the method could be modified so that the setup request message is sent from an entity other than the MME. For example, the setup request message could be sent from (1) an entity other than the MME within the 3GPP RAN, (2) a different entity within a non-3GPP RAN, (3) an entity within the second radio network (e.g., WLAN), or (4) the UE device, itself.
At step 504, the base station 102 sets up the requested radio resources. At step 506, the base station determines at least one network-related parameter threshold value, based at least partially on the indication that all or a portion of user data traffic of the UE device 104 has been handed over from the second radio network. Although not explicitly shown in
Although various combinations of steps have been described in connection with the method shown in
Clearly, other embodiments and modifications of this invention will occur readily to those of ordinary skill in the art in view of these teachings. The above description is illustrative and not restrictive. This invention is to be limited only by the following claims, which include all such embodiments and modifications when viewed in conjunction with the above specification and accompanying drawings. The scope of the invention should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims along with their full scope of equivalents.
The present application claims priority to Provisional Application No. 62/252,273 entitled “METHOD OF IDENTIFYING TRAFFIC TO 3GPP RAN HANDED OVER FROM WLAN TO 3GPP RAN,” docket number TPRO 00275, filed Nov. 6, 2015, which is assigned to the assignee hereof and hereby expressly incorporated by reference in its entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2016/060363 | 11/3/2016 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62252273 | Nov 2015 | US |
