DEVICES AND METHOD FOR RETRIEVING AND UTILIZING NEIGHBORING WLAN INFORMATION FOR LTE LAA OPERATION

• US 20150351115A1
• Filed: 03/27/2015
• Published: 12/03/2015
• Est. Priority Date: 06/02/2014
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Jeon, Jeongho, Niu, Huaning, Han, Seunghee, Li, Qinghua, Kwon, Hwan-Joon
• Granted Patent: US 9,872,233 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A License Assisted Access (LAA) enhanced NodeB (eNB), user equipment (UE) and communication methods therebetween operating in a Long Term Evolution unlicensed band (LTE-U) are generally described. The eNB may transmit a request to the UE for information regarding a Wireless Local Area Network (WLAN) over which the UE may be able to communicate. The WLAN information may include an LTE-U channel and time window for reporting. The UE may obtain the WLAN information through communication with an access point (AP). Measurement information of the LTE-U channel may also be obtained by or on behalf of the UE. The UE may transmit the WLAN information to the eNB. The eNB may use the WLAN information or submit the WLAN information to a network entity to perform channel selection, UE grouping or localization, appointing delegate UEs to perform channel sensing or scheduling UEs in a same group or proximity.

Claims

1. A License Assisted Access (LAA) enhanced NodeB (eNB) comprising:

a transceiver configured to communicate with an LAA user equipment (UE) operating in an unlicensed band; and

processing circuitry configured to;

configure the transceiver to transmit a request to the UE for information regarding a Wireless Local Area Network (WLAN) over which the UE is able to communicate, the WLAN information comprising information about the unlicensed band including at least one channel and a time window;

configure the transceiver to receive, from the UE, a report including the WLAN information; and

set network operations involving use of the unlicensed band by the eNB based on the WLAN information.

2. The eNB of claim 1, wherein:

the processing circuitry further configured cause the transceiver to submit the WLAN information to a network entity to use the WLAN information in setting network operations involving use of the unlicensed band by UEs.

3. The eNB of claim 1, wherein the WLAN information comprises at least one of:

information that is obtainable by the UE without measurement, and

information from a measurement performable by or on behalf of the UE.

4. The eNB of claim 1, wherein:

the band is an Long Term Evolution (LTE) unlicensed band, and

in setting the network operations, the processing circuitry is further configured to;

select a channel in the LTE unlicensed band, from among a plurality of candidate channels, that is less populated by the WLAN, the WLAN information including at least one of Basic Service Set (BSS) Load, BSS average access delay, clear channel assessment (CCA) report, or channel load report for each of the candidate channels; and

configure the transceiver to communicate with the UE using the selected channel.

5. The eNB of claim 1, wherein:

the band is an Long Term Evolution (LTE) unlicensed band, and

in setting the network operations, the processing circuitry is further configured to;

determine, from the WLAN information, WLAN interference for each of a plurality of channels in the LTE unlicensed band; and

select, from among the plurality of channels, a channel comprising a lower amount of WLAN interference; and

assign a new UE to an eNB operating over the selected channel.

6. The eNB of claim 1, wherein:

the band is an Long Term Evolution (LTE) unlicensed band, and

the processing circuitry is further configured to, based on the WLAN information determine UE grouping or localization to enable group sensing and scheduling for LTE UEs, the determination based on reports from a plurality of UEs indicating a highly correlated set of basic service set identifications (BSSIDs).

7. The eNB of claim 6, wherein the processing circuitry is further configured to, based on the determination:

configure the transceiver to transmit a message to one of the plurality of UEs appointing the one of the plurality of UEs as a delegate for another of the plurality of UEs in the same group or proximity suffering from unlicensed band interference to perform channel sensing on behalf of the other of the plurality of UEs.

9. The eNB of claim 1, wherein the processing circuitry is further configured to:

configure the transceiver to transmit, to the UE in the request, information about an access point (AP) operating over the channel, the information comprising at least one of;

a beacon schedule of the AP including channel index, rough beacon start time, and basic service set identification (BSSID) of the AP.

10. The eNB of claim 1, wherein the request at least one of:

indicates to the UE to send the report in response to the request; and

indicates to the UE to send the report in response to predetermined triggering conditions being met and a duration over which reports are to be sent to the eNB, the predetermined triggering conditions including changes in the neighboring WLAN information including basic service set identifications (BSSIDs) whose beacons the UE can overhear or an advertised BSS load level.

11. The eNB of claim 1, wherein the WLAN information comprises at least one of:

a basic service set identifier (BSSID);

information in a WLAN management frame body;

information defined for a WLAN Measurement Report.

12. The eNB of claim 1, further comprising:

an antenna configured to transmit communications between the transceiver and the UE.

13. A License Assisted Access (LAA) user equipment (UE) comprising:

a transceiver configured to communicate with an LAA enhanced NodeB (eNB) using an unlicensed band; and

processing circuitry configured to;

configure the transceiver to receive a request from the eNB for information regarding a Wireless Local Area Network (WLAN) with which the UE is able to communicate, the request specifying a manner for which the WLAN information is to be obtained;

configure the transceiver obtain the WLAN information through communication with an access point (AP) on a channel of the unlicensed band using the specified manner; and

configure the transceiver to transmit a report including the WLAN information to the eNB.

14. The UE of claim 13, further comprising:

a WiFi module configured to communicate with a plurality of APs,

wherein the processing circuitry is further configured to;

determine a list of APs whose beacons the UE is able to receive on the specified channel;

configure the transceiver to tune to the specified channel to sequentially collect the basic service set identifications (BSSIDs) of the APs using the beacons of the APs, and

configure the transceiver to transmit to the eNB the BSSIDs of the APs in the report.

15. The UE of claim 13, wherein:

the UE identifies a management frame type comprising the WLAN information specified in the request from the eNB.

16. The UE of claim 13, wherein:

the request specifies a time window for which the WLAN information is requested, and

the processing circuitry is further configured to;

extract the WLAN information in a field of a frame over the specified time window.

17. The UE of claim 13, wherein the processing circuitry is further configured to:

configure the transceiver obtain the WLAN information by sending one of a Probe Request, Association Request, and Reassociation Request to the AP and respectively receiving one of a Probe Response, Association Response and Reassociation Response message.

18. The UE of claim 13, wherein the processing circuitry is further configured to:

configure the transceiver to perform a radio measurement on the channel.

19. The UE of claim 13, wherein the processing circuitry is further configured to:

configure the transceiver to transmit a request for a station in the same basic service set (BSS) to perform measurements on behalf of the UE and transmit resulting measurement information to the UE.

20. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a License Assisted Access (LAA) enhanced NodeB (eNB) to configure the eNB to communicate via a transceiver with an LAA user equipment (UE) operating in an unlicensed band, the one or more processors to configure the eNB to:

transmit a request to the UE for information regarding a neighboring Wireless Local Area Network (WLAN) with which the UE is able to communicate, the WLAN information comprising information available in a WLAN management frame or from a response message sent in response to a request message sent by the UE to an access point (AP) operating over a channel in the unlicensed band;

configure the transceiver to receive, from the UE, a report including the WLAN information, and

configure the transceiver to submit the WLAN information to a network entity for use in network operations involving use of the unlicensed band by UEs.

21. The non-transitory computer-readable storage medium of claim 20, wherein:

the WLAN information further comprises measurement information performable by or on behalf of the UE.

22. The non-transitory computer-readable storage medium of claim 20, wherein:

the band is an Long Term Evolution (LTE) unlicensed band, and

the processing circuitry is further configured to, based on the WLAN information;

select a channel in the LTE unlicensed band, from among a plurality of candidate channels, which is less populated by the WLAN or has a lower amount of WLAN interference, and

assign a new UE to an eNB operating over the selected channel.

23. The non-transitory computer-readable storage medium of claim 20, wherein:

the request transmitted to the UE from the transceiver comprises information about the AP including at least one of;

a beacon schedule of the AP including channel index, rough beacon start time, and basic service set identification (BSSID) of the AP.

24. The non-transitory computer-readable storage medium of claim 20, wherein the request at least one of:

indicates to the UE to send the report in response to the request; and

indicates to the UE to send the report in response to predetermined triggering conditions being met and a duration over which reports are to be sent to the eNB, the predetermined triggering conditions including changes in the neighboring WLAN information including basic service set identifications (BSSIDs) whose beacons the UE can overhear or an advertised BSS load level.

25. A method for retrieving neighboring Wireless Local Area Network (WLAN) information at a License Assisted Access (LAA) enhanced NodeB (eNB) from a LAA user equipment (UE) in an unlicensed band, the method comprising:

transmitting a request for the WLAN information from the eNB to the UE, the request specifying at least one of a channel and time window for which the WLAN information is to be obtained;

receiving the WLAN information from the UE at the eNB, the WLAN information comprising operational information of the unlicensed band for which measurement is not employed; and

setting network operations involving use of the unlicensed band by UEs by at least one of;

processing the WLAN information at the eNB to set the network operations, and

submitting the WLAN information to a network entity for the network entity to set the network operations.

26. The method of claim 25, wherein:

the WLAN information further comprises measurement information obtained by or on behalf of the UE.

27. The method of claim 25, wherein:

the request is transmitted to the UE via one of L1/L2 Physical Downlink Control Channel (PDCCH), Media Access Control Control Element (MAC-CE), or a Radio Resource Control (RRC) signaling over a licensed or unlicensed channel, and

the request is transmitted to the UE via a WiFi measurement frame.

28. The method of claim 25, wherein the request indicates to the UE at least one of to acquire:

a WLAN basic service set identifier (BSSID) from WLAN Media Access Control (MAC) frames,

information in a WLAN management frame body from a response to a request to neighboring WLAN access points (APs), and

information defined for WLAN Measurement Report by one of;

the UE performing a measurement, and

the UE requesting a WLAN station to perform a measurement for the UE.

29. The method of claim 25, wherein the request indicates to the UE to at least one of:

generate a report comprising the WLAN information passively in response to the request,

trigger generation of a report comprising the WLAN information when a predetermined condition is met even in the absence of a request from the eNB,

transmit a report comprising the WLAN information to the eNB via L1/L2 (PDCCH), MAC CE, RRC signaling, or another higher layer signaling, and

transmit a report comprising the WLAN information to the eNB via WiFi measurement frames.

30. The method of claim 25, further comprising, based on the received WLAN information, at least one of:

channel selection,

UE grouping or localization,

appointing delegate UEs to perform channel sensing on behalf of other UEs in a same group or proximity experiencing similar channel conditions, and

scheduling a set of UEs in a same group or proximity without additional channel sensing.