Method and apparatus for tracking uplink beams in beamforming-based wireless communication system

A method for performing a communication with a mobile station (MS) by a base station (BS) in a wireless communication system, the method comprising:

• receiving, by the BS, a plurality of ranging codes through MS transmit beams allocated to different time slots, wherein the plurality of ranging codes are mapped to the MS transmit beams of the MS, respectively, a ranging code mapped to an MS transmit beam among the plurality of ranging codes is repeatedly transmitted through the MS transmit beam during a plurality of time slots corresponding to a number of BS receive beams of a BS, the MS transmit beam is one of the MS transmit beams, and the plurality of ranging codes are selected to be used for tracking the MS transmit beams from multiple ranging codes shared by multiple MSs based on a contention;
• selecting, by the BS, at least one best MS transmit beam among the MS transmit beams based on the received plurality of ranging codes and allocating first uplink (UL) time-frequency resources to be used for receiving best beam information from the MS;
• transmitting, by the BS to the MS, time slot information related to the at least one best MS transmit beam and allocation information of the first UL time-frequency resources;
• receiving, by the BS from the MS, the best beam information indicating the at least one best MS transmit beam identified by the time slot information and an MS identifier of the MS on the first UL time-frequency resources;
• identifying, by the BS, the MS having the at least one best MS transmit beam among the multiple MSs based on the MS identifier and allocating second UL time-frequency resources to be used for UL data transmission of the identified MS;
• transmitting, by the BS to the MS, information indicating the second UL time-frequency resources for UL data transmission and at least one MS transmit beam determined for the UL data transmission of the MS based on the at least one best MS transmit beam and the MS identifier;
• and
• receiving, by the BS from the MS, UL data on the second UL time-frequency resources, wherein the UL data is transmitted using the at least one MS transmit beam by the MS.

A mobile station (MS) in a wireless communication system, the MS comprising:

• a transceiver;
• and
• a controller configured to control the transceiver;
• wherein the transceiver is configured to:
• transmit a plurality of ranging codes through MS transmit beams of the MS, wherein the plurality of ranging codes are mapped to the MS transmit beams allocated to different time slots, respectively, a ranging code mapped to an MS transmit beam among the plurality of ranging codes is repeatedly transmitted through the MS transmit beam during a plurality of time slots corresponding to a number of base station (BS) receive beams of a BS, the MS transmit beam is one of the MS transmit beams, and the plurality of ranging codes are selected to be used for tracking the MS transmit beams from multiple ranging codes shared by multiple MSs based on a contention;
• receive, from the BS, time slot information related to at least one best MS transmit beam selected from the MS transmit beams, and allocation information of first uplink (UL) time-frequency resources, wherein the at least one best MS transmit beam is selected by the BS based on the plurality of ranging codes, and the first UL time-frequency resources are allocated to be used for transmitting best beam information;
• transmit, to the BS, the best beam information indicating the at least one best MS transmit beam identified by the time slot information and an MS identifier of the MS on the first UL time-frequency resources;
• receive, from the BS, resource allocation information indicating second UL time-frequency resources for UL data transmission and at least one MS transmit beam determined for the UL data transmission based on the at least one best MS transmit beam and the MS identifier, wherein the BS is configured to identify the MS having the at least one best MS transmit beam among the multiple MSs based on the MS identifier and allocate the second UL time-frequency resources to be used for the UL data transmission of the identified MS;
• and
• transmit, to the BS, UL data on the second UL time-frequency resources using the at least one MS transmit beam determined for the UL data transmission.

A base station (BS) in a wireless communication system, the BS comprising:

• a transceiver;
• and
• a controller configured to control the transceiver to:
• receive a plurality of ranging codes through mobile station (MS) transmit beams of an MS, wherein the plurality of ranging codes are mapped to the MS transmit beams allocated to different time slots, respectively, a ranging code mapped to an MS transmit beam among the plurality of ranging codes is repeatedly transmitted through the MS transmit beam during a plurality of time slots corresponding to a number of BS receive beams of the BS, the MS transmit beam is one of the MS transmit beams, and the plurality of ranging codes are selected to be used for tracking the MS transmit beams from multiple ranging codes shared by multiple MSs based on a contention;
• transmit, to the MS, time slot information related to at least one best MS transmit beam selected from the MS transmit beams based on the received plurality of ranging codes, and allocation information of first uplink (UL) time-frequency resources;
• receive, from the MS, best beam information indicating the at least one best MS transmit beam identified by the time slot information and an MS identifier of the MS on the first UL time-frequency resources;
• transmitting, to the MS, information indicating second UL time-frequency resources for UL data transmission and at least one MS transmit beam determined for the UL data transmission of the MS based on the at least one best MS transmit beam and the MS identifier of the MS;
• receive UL data on the second UL time-frequency resources, wherein the UL data is transmitted using the at least one MS transmit beam by the MS,
• wherein the controller is configured to:
• select the at least one best MS transmit beam among the MS transmit beams based on the received respective codes and allocate the first UL time-frequency resources to be used for receiving the best beam information from the MS;
• and
• identify the MS having the at least one best MS transmit beam among the multiple MSs based on the MS identifier and allocate the second UL time-frequency resources to be used for the UL data transmission of the identified MS.