METHODS, APPARATUSES AND SYSTEMS FOR SUPPORTING LONG TERM CHANNEL SENSING IN SHARED SPECTRUM

• US 20190075597A1
• Filed: 08/22/2018
• Published: 03/07/2019
• Est. Priority Date: 09/01/2017
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: YERRAMALLI, Srinivas, KADOUS, Tamer
• Application Number:
  US16/108,862
• Publication Number:
  US 20190075597A1
• Time in Patent Office: Days
• CPC Class Codes: H04J 11/0073 Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 8/22 Processing or transfer of terminal data, e.g. status or physical capabilities

Abstract

Methods, systems, and devices for wireless communication are described. A base station may configure a system frame number (SFN) and hyper-SFN associated with a long term sensing pattern. The base station may then transmit the SFN and hyper-SFN to indicate a sensing period corresponding to the long term sensing pattern. A UE may receive a SFN and hyper-SFN associated with a long term sensing pattern. The UE may determine, based on the SFN and hyper-SFN, a sensing period corresponding to the long term sensing pattern. The UE may then suspend a plurality of procedures during the sensing period.

Claims

1. A method for wireless communication, comprising:

configuring a system frame number (SFN) and hyper-SFN associated with a long term sensing pattern; and

transmitting the SFN and hyper-SFN to indicate a sensing period corresponding to the long term sensing pattern.

2. The method of claim 1, further comprising suspending all transmissions during the sensing period.

3. The method of claim 2, further comprising:

determining whether a shared spectrum is available during the sensing period;

resuming, after the sensing period, transmissions on the shared spectrum if it is determined that the shared spectrum is available; and

continue, after the sensing period, suspending all transmissions if it is determined that the shared spectrum is unavailable.

4. The method of claim 1, further comprising configuring whether to suspend a timer during the sensing period, the timer being associated with a user equipment (UE) or a cell.

5. The method of claim 4, wherein the configuring whether to suspend the timer comprises configuring whether to suspend an uplink (UL) timing alignment timer during the sensing period.

6. The method of claim 4, wherein the configuring whether to suspend the timer is based on mobility of the UE.

7. The method of claim 1, further comprising transmitting, after the sensing period, at a power level less than a transmission power level used prior to the sensing period.

8. The method of claim 7, further comprising, prior to transmitting at the reduced power level, at least one of:

transmitting, to at least one UE, a handover command to a different cell;

reconfiguring at least one UE to operate at a reduced power level;

or configuring at least one UE to operate in a coverage extension mode.

9. A method for wireless communication, comprising:

receiving a system frame number (SFN) and hyper-SFN associated with a long term sensing pattern;

determining, based on the SFN and hyper-SFN, a sensing period corresponding to the long term sensing pattern; and

suspending a plurality of procedures during the sensing period.

10. The method of claim 9, wherein the suspending the plurality of procedures comprises at least one of:

suspending monitoring all downlink transmissions from a serving base station;

suspending all uplink transmissions to the serving base station;

suspending a plurality of measurement related procedures;

or suspending updating a plurality of media access control (MAC) timers and radio resource control (RRC) timers.

11. The method of claim 9, further comprising:

detecting whether a serving base station has acquired a shared spectrum after the sensing period; and

resuming the plurality of procedures after the sensing period when it is detected that the serving base station has acquired the shared spectrum.

12. The method of claim 11, wherein the detecting comprises at least one of:

detecting a physical broadcast channel (PBCH);

detecting a primary synchronization signal/secondary synchronization signal (PSS/SSS);

detecting a cell-specific reference signal (CRS);

or

detecting, in a downlink control information, an indication that the serving base station has restarted transmission.

13. The method of claim 11, wherein the resuming the plurality of procedures comprises at least one of:

monitoring a physical downlink control channel (PDCCH) for a downlink assignment or uplink grant;

receiving a physical shared data channel (PDSCH) corresponding to the downlink assignment;

receiving a physical hybrid automatic repeat request channel (PHICH) for an uplink transmission sent prior the sensing period and following a retransmission timeline for the uplink transmission after receiving the PHICH;

transmitting a retransmission on a physical uplink shared channel (PUSCH) according to a PHICH received prior to the sensing period;

or

transmitting an ACK/NACK for a downlink transmission received prior to the sensing period.

14. The method of claim 9, further comprising receiving a configuration on whether to suspend an UL timing alignment timer during the sensing period.

15. The method of claim 14, when the UL timing alignment timer has not expired and after the sensing period, further comprising at least one of:

transmitting ACK/NACK for DL transmission received prior the sensing period;

dropping an old channel state information (CSI) report if there is insufficient time to generate a new CSI report before a reporting occasion;

transmitting a physical uplink shared channel (PUSCH) associated with an uplink grant received prior to the sensing period;

transmitting a scheduling request (SR) if uplink data is made available for transmission;

or

resuming a plurality of measurement related procedures.

16. The method of claim 9, wherein the suspending the plurality of procedures comprises suspending monitoring for paging messages when in an idle mode.

17. The method of claim 9, when in an idle mode and uplink data is made available for transmission during the sensing period, further comprising:

detecting whether a base station has acquired a shared spectrum after the sensing period;

responsive to detecting that the base station has acquired the shared spectrum, performing random access to connect to the base station; and

transmitting the uplink data according to a first scheduled uplink transmission associated with the random access.

18. The method of claim 9, further comprising, after the sensing period, at least one of:

receiving a handover command to a different cell;

receiving a reconfiguration to operate at a reduced power level;

or

receiving a configuration to operate in a coverage extension mode.

19. The method of claim 18, further comprising thereafter, receiving downlink transmissions transmitted at a power level less than a transmission power level used prior to the sensing period.

20. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, wherein the instructions are executable by the processor to configure a system frame number (SFN) and hyper-SFN associated with a long term sensing pattern; and

a transmitter configured to transmit the SFN and hyper-SFN to indicate a sensing period corresponding to the long term sensing pattern.

21. The apparatus of claim 20, wherein the instructions are further executable by the processor to suspend all transmissions during the sensing period.

22. The apparatus of claim 21, wherein the instructions are further executable by the processor to:

determine whether a shared spectrum is available during the sensing period;

resume, after the sensing period, transmissions on the shared spectrum if it is determined that the shared spectrum is available; and

continue, after the sensing period, suspending all transmissions if it is determined that the shared spectrum is unavailable.

23. The apparatus of claim 20, wherein the instructions are further executable by the processor to configure whether to suspend a timer during the sensing period, the timer being associated with a user equipment (UE) or a cell.

24. The apparatus of claim 23, wherein the instructions are further executable by the processor to configure at least one of:

whether to suspend an uplink (UL) timing alignment timer during the sensing period;

or

whether to suspend the timer based on mobility of the UE.

25. The apparatus of claim 20, wherein the transmitter is further configured to transmit, after the sensing period, at a power level less than a transmission power level used prior to the sensing period.

26. An apparatus for wireless communication, comprising:

a receiver configured to receive a system frame number (SFN) and hyper-SFN associated with a long term sensing pattern;

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, wherein the instructions are executable by the processor to;

determine, based on the SFN and hyper-SFN, a sensing period corresponding to the long term sensing pattern; and

suspend a plurality of procedures during the sensing period.

27. The apparatus of claim 26, wherein the instructions are further executable by the processor to at least one of:

suspend monitoring all downlink transmissions from a serving base station;

suspend all uplink transmissions to the serving base station;

suspend a plurality of measurement related procedures;

or

suspend updating a plurality of media access control (MAC) timers and radio resource control (RRC) timers.

28. The apparatus of claim 26, wherein the instructions are further executable by the processor to:

detect whether a serving base station has acquired a shared spectrum after the sensing period; and

resume the plurality of procedures after the sensing period when it is detected that the serving base station has acquired the shared spectrum.

29. The apparatus of claim 28, wherein the instructions are further executable by the processor to at least one of:

detect a physical broadcast channel (PBCH);

detect a primary synchronization signal/secondary synchronization signal (PSS/SSS);

detect a cell-specific reference signal (CRS);

or

detect, in a downlink control information, an indication that the serving base station has restarted transmission.

30. The apparatus of claim 26, wherein the receiver is further configured to receive a configuration on whether to suspend an UL timing alignment timer during the sensing period.