Method for millimeter wave beam tracking

摘要

A method and apparatus for improving and performing mmW beam tracking is disclosed. Localization methods to improve prediction of the position of a WTRU are described, which may allow a millimeter wave base station (mB) to appropriately select a modified beam and to perform more efficient handover. WTRUs may report directional signal strength measurements to mBs, which may then be used to generate a directional radio environment map (DREM) for use in identifying secondary links to use when a primary link fails. Additional localization techniques using internal/external information for prediction are described. Historical data use and the use of data obtained from mB-mB cooperation including feedback information and reference signaling information are also described. Methods for beam tracking for directional relays and initial beam training optimization are described as well. Finally, WTRU localization precision improvement, beamwidth adaptation, and assisted beam tracking and handover methods are also described.

主权项

1. A method for use in a base station (BS) for handover of a communication link from a primary beam, the method comprising:
establishing a communication link with a wireless transmit/receive unit (WTRU), wherein the communication link uses a primary beam; transmitting a request to the WTRU to perform at least one directional signal strength measurement on at least one signal received by the WTRU; transmitting a request to the WTRU to provide location data associated with the WTRU; receiving at least one performed directional signal strength measurement from the WTRU; receiving location data associated with the WTRU; generating a directional radio environment map (DREM) based on the at least one received directional signal strength measurement from the WTRU and the received location data associated with the WTRU; and performing a handover of the communication link from the primary beam to a secondary beam, on a condition that the primary beam is disrupted, wherein the secondary beam is selected based on the generated DREM.