Method and apparatus for performing random access procedure in NB-IoT carrier in wireless communication system

• US 10,728,077 B2
• Filed: 09/02/2016
• Issued: 07/28/2020
• Est. Priority Date: 09/02/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Yunjung
• Primary Examiner(s): Acolatse, Kodzovi
• Assistant Examiner(s): Ali, Farhad
• Application Number:
  US15/754,585
• Publication Number:
  US 20180249509A1
• Time in Patent Office: 1,425 Days
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04L 27/2659 Coarse or integer frequency offset determination and synchronisation
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

A method and apparatus for performing a random access procedure in a narrowband internet-of-things (NB-IoT) carrier in a wireless communication system is provided. A user equipment (UE) transmits a random access preamble to a network, receives a random access response from the network, determines resources of scheduled uplink (UL) transmission, and performs the scheduled UL transmission to the network. A number of repetitions and a number of tones for the scheduled UL transmission are determined by the random access preamble.

Claims

1. A method for performing a random access procedure in a narrowband internet-of-things (NB-IoT) carrier in a wireless communication system, the method comprising:

transmitting a random access preamble to a network;

receiving a random access response from the network, wherein the random access response includes information on available tones and starting subframe of a scheduled uplink (UL) transmission;

determining a plurality of tones of the scheduled UL transmission within the available tones, based on an index of the random access preamble; and

performing the scheduled UL transmission to the network from the starting subframe on the plurality of tones,

wherein a number of the plurality of tones is determined based on coverage level of the UE,

wherein resources of the scheduled UL transmission include a time resource of the scheduled UL transmission, and

wherein the time resource of the scheduled UL transmission is determined based on a gap value (g) and the index of the random access response (i), where the scheduled UL transmission is calculated by (g*i)+4.

2. The method of claim 1, wherein the number of tones for the scheduled UL transmission is one.

3. The method of claim 1, wherein the time resource of the scheduled UL transmission is indicated by the random access response.

4. The method of claim 1, wherein a frequency resource of the scheduled UL transmission is determined based on an index of the random access response.

5. A user equipment (UE) in a wireless communication system, the UE comprising:

a memory;

a transceiver; and

a processor, coupled to the memory and the transceiver, that;

controls the transceiver to transmit a random access preamble to a network,

controls the transceiver to receive a random access response from the network, wherein the random access response includes information on available tones and starting subframe of a scheduled uplink (UL) transmission,

determines a plurality of tones of the scheduled UL transmission within the available tones, based on an index of the random access preamble, and

controls the transceiver to perform the scheduled UL transmission to the network from the starting subframe on the plurality of tones,

wherein a number of the plurality of tones is determined based on coverage level of the UE,

wherein resources of the scheduled UL transmission include a time resource of the scheduled UL transmission, and

wherein the time resource of the scheduled UL transmission is determined based on a gap value (g) and the index of the random access response (i), where the scheduled UL transmission is calculated by (g*i)+4.