METHOD AND USER EQUIPMENT FOR RECEIVING DOWNLINK SIGNAL, AND METHOD AND BASE STATION FOR TRANSMITTING DOWNLINK SIGNAL

• US 20170289965A1
• Filed: 10/19/2016
• Published: 10/05/2017
• Est. Priority Date: 03/31/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: YOU, Hyangsun, YI, Yunjung
• Granted Patent: US 10,231,198 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 52/02 Power saving arrangements in wired systems H04L12/12; signaling of mobile application services, e.g. low battery notifications H04W4/20
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Disclosed herein is a method and apparatus for transmitting/receiving a signal in a wireless communication system supporting NB-IoT. An eNB provides a user equipment (UE), for which NB-IoT is not configured, with information about frequency bands (anchor RBs) possibly having a synchronization signal for NB-IoT (hereinafter, an NB-IoT SS). When the eNB transmits a downlink signal to the UE, it may puncture the downlink signal on an RB having the NB-IoT SS, based on the information. When the UE transmits an uplink signal, it may puncture the uplink signal on an RB having the NB-IoT SS, based on the information.

Claims

1. A method of receiving a downlink signal at a user equipment in a wireless communication system, the method comprising:

receiving narrowband IoT (NB-IoT) anchor physical resource block (PRB) information indicating PRBs (NB-IoT anchor PRBs) where an NB-IoT synchronization signal (SS) can be present;

receiving frequency resource information indicating a frequency resource to which the downlink signal is mapped; and

receiving the downlink signal using the frequency resource based on the frequency resource information,

wherein, when the frequency resource comprises a first PRB used as a first NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, and a subframe having the downlink signal is a first NB-IoT SS subframe having an SS of the first NB-IoT anchor PRB, a portion of the downlink signal mapped to the first PRB in the downlink signal mapped to the frequency resource is not received in the first NB-IoT SS subframe.

2. The method according to claim 1, wherein, when the frequency resource further comprises a second PRB used as a second NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, the second PRB being different from the first PRB and non-contiguous with the first PRB, and a subframe having the downlink signal is a second NB-IoT SS subframe having an SS of the second NB-IoT anchor PRB, a portion of the downlink signal mapped to the second PRB in the downlink signal mapped to the frequency resource is not received in the second NB-IoT SS subframe.

3. The method according to claim 1, wherein the downlink signal is mapped to the frequency resource in each of a plurality of subframes,

wherein the downlink signal including the portion mapped to the first PRB is received in a subframe not corresponding to the first NB-IoT SS subframe among the plurality of subframes.

4. The method according to claim 3, further comprising:

receiving time resource information indicating the plurality of subframes for the downlink signal.

5. The method according to claim 1, wherein the downlink signal is not an NB-IoT downlink signal.

6. A method of transmitting a downlink signal at a base station in a wireless communication system, the method comprising:

transmitting narrowband IoT (NB-IoT) anchor physical resource block (PRB) information indicating PRBs (NB-IoT anchor PRBs) where an NB-IoT synchronization signal (SS) can be present;

transmitting frequency resource information indicating a frequency resource to which the downlink signal is mapped; and

transmitting the downlink signal using the frequency resource based on the frequency resource information,

wherein, when the frequency resource comprises a first PRB used as a first NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, and a subframe having the downlink signal is a first NB-IoT SS subframe having an SS of the first NB-IoT anchor PRB, a portion of the downlink signal mapped to the first PRB in the downlink signal mapped to the frequency resource is not transmitted in the first NB-IoT SS subframe.

7. The method according to claim 6, wherein, when the frequency resource further comprises a second PRB used as a second NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, the second PRB being different from the first PRB and non-contiguous with the first PRB, and a subframe having the downlink signal is a second NB-IoT SS subframe having an SS of the second NB-IoT anchor PRB, a portion of the downlink signal mapped to the second PRB in the downlink signal mapped to the frequency resource is not transmitted in the second NB-IoT SS subframe.

8. The method according to claim 6, wherein the downlink signal is mapped to the frequency resource in each of a plurality of subframes,

wherein the downlink signal including the portion mapped to the first PRB is transmitted in a subframe not corresponding to the first NB-IoT SS subframe among the plurality of subframes.

9. The method according to claim 8, further comprising:

transmitting time resource information indicating the plurality of subframes for the downlink signal.

10. The method according to claim 6, wherein the downlink signal is not an NB-IoT downlink signal.

11. A user equipment for receiving a downlink signal in a wireless communication system, the user equipment comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to;

control the RF unit to receive narrowband IoT (NB-IoT) anchor physical resource block (PRB) information indicating PRBs (NB-IoT anchor PRBs) where an NB-IoT synchronization signal (SS) can be present;

control the RF unit to receive frequency resource information indicating a frequency resource to which the downlink signal is mapped; and

control the RF unit to receive the downlink signal using the frequency resource based on the frequency resource information,

wherein, when the frequency resource comprises a first PRB used as a first NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, and a subframe having the downlink signal is a first NB-IoT SS subframe having an SS of the first NB-IoT anchor PRB, the processor assumes that a portion of the downlink signal mapped to the first PRB in the downlink signal mapped to the frequency resource is not transmitted in the first NB-IoT SS subframe.

12. The user equipment according to claim 11, wherein, when the frequency resource further comprises a second PRB used as a second NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, the second PRB being different from the first PRB and non-contiguous with the first PRB, and a subframe having the downlink signal is a second NB-IoT SS subframe having an SS of the second NB-IoT anchor PRB, the processor assumes that a portion of the downlink signal mapped to the second PRB in the downlink signal mapped to the frequency resource is not transmitted in the second NB-IoT SS subframe.

13. The user equipment according to claim 11, wherein the downlink signal is mapped to the frequency resource in each of a plurality of subframes,

wherein the processor assumes that the downlink signal including the portion mapped to the first PRB is received in a subframe not corresponding to the first NB-IoT SS subframe among the plurality of subframes.

14. The user equipment according to claim 13, wherein the processor controls the RF unit to further receive time resource information indicating the plurality of subframes for the downlink signal.

15. The user equipment according to claim 14, wherein the downlink signal is not an NB-IoT downlink signal.

16. A base station for transmitting a downlink signal in a wireless communication system, the base station comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to;

control the RF unit to transmit narrowband IoT (NB-IoT) anchor physical resource block (PRB) information indicating PRBs (NB-IoT anchor PRBs) where an NB-IoT synchronization signal (SS) can be present;

control the RF unit to transmit frequency resource information indicating a frequency resource mapped to the downlink signal; and

control the RF unit to transmit the downlink signal using the frequency resource based on the frequency resource information,

wherein, when the frequency resource comprises a first PRB used as a first NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, and a subframe having the downlink signal is a first NB-IoT SS subframe having an SS of the first NB-IoT anchor PRB, the processor controls the RF unit not to transmit, in the first NB-IoT SS subframe, a portion of the downlink signal mapped to the first PRB in the downlink signal mapped to the frequency resource.

17. The base station according to claim 16, wherein, when the frequency resource further comprises a second PRB used as a second NB-IoT anchor PRB indicated by the NB-IoT anchor PRB information, the second PRB being different from the first PRB and non-contiguous with the first PRB, and a subframe having the downlink signal is a second NB-IoT SS subframe having an SS of the second NB-IoT anchor PRB, the processor controls the RF unit not to transmit, in the second NB-IoT SS subframe, a portion of the downlink signal mapped to the second PRB in the downlink signal mapped to the frequency resource is not transmitted.

18. The base station according to claim 16, wherein the processor is configured to map the downlink signal to the frequency resource in each of a plurality of subframes,

wherein the processor controls the RF unit to transmit the downlink signal including the portion mapped to the first PRB in a subframe not corresponding to the first NB-IoT SS subframe among the plurality of subframes.

19. The base station according to claim 18, wherein the processor controls the RF unit to further transmit time resource information indicating the plurality of subframes for the downlink signal.

20. The base station according to claim 16, wherein the downlink signal is not an NB-IoT downlink signal.