SYNCHRONIZATION AND PAGING CHANNEL DESIGN FOR WIRELESS COMMUNICATIONS

• US 20180309479A1
• Filed: 12/26/2017
• Published: 10/25/2018
• Est. Priority Date: 04/19/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yerramalli, Srinivas, Kadous, Tamer, Liu, Chih-Hao
• Granted Patent: US 10,298,289 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation
• CPC Class Codes: H04J 3/00 Time-division multiplex systems H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q
• 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 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0012 Hopping in multicarrier systems for frequency hopping in spread spectrum systems H04B1/713
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• 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 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

Methods, systems, and devices for wireless communication are described that provide for a base station to use frequency hopping for cell acquisition according to a frequency hopping pattern. The frequency hopping pattern may include a set of anchor channels and a set of non-anchor channels used by a base station to communicate with wireless devices. The base station may occupy an anchor channel more often than a non-anchor channel and may transmit acquisition signals using the anchor channel. The anchor channel may also be used by the base station and a user equipment (UE) to exchange paging information, positioning information, random access resources, location of other channels, etc.

Claims

1. A method for wireless communication, comprising:

identifying a frequency hopping pattern comprising a plurality of hopping frequencies, the plurality of hopping frequencies comprising an anchor channel frequency and a set of non-anchor channel frequencies; and

performing a plurality of transmissions over the plurality of hopping frequencies during a hopping interval based at least in part on the frequency hopping pattern, wherein the plurality of transmissions comprise a first number of discovery reference signal (DRS) transmissions sent on the anchor channel frequency and a second number of transmissions sent on each non-anchor channel frequency, the first number being greater than or equal to the second number.

2. The method of claim 1, wherein performing the plurality of transmissions comprises:

performing a DRS transmission on the anchor channel frequency after performing one or more of the second number of transmissions sent on one or more non-anchor channel frequencies.

3. The method of claim 1, further comprising:

determining a probability for occupying the anchor channel frequency within the hopping interval, wherein the probability for occupying the anchor channel frequency is greater than a probability for occupying a non-anchor channel frequency of the set of non-anchor channel frequencies.

4. The method of claim 1, wherein performing the plurality of transmissions comprises:

performing the first number of DRS transmissions sent on the anchor channel frequency according to a first time division duplex (TDD) configuration; and

performing the second number of transmissions sent on each non-anchor channel frequency according to a second TDD configuration.

5. The method of claim 1, wherein identifying the frequency hopping pattern further comprises:

coordinating the plurality of transmissions with other wireless devices, wherein the coordination is based at least in part on avoiding collisions on the anchor channel frequency.

6. The method of claim 1, wherein:

each of the first number of DRS transmissions comprises at least one of;

a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), a master information block (MIB), or a system information block (SIB).

7. The method of claim 1, wherein performing the plurality of transmissions comprises:

transmitting a paging message on the anchor channel frequency.

8. The method of claim 7, further comprising:

receiving a paging response from a wireless device on the anchor channel frequency, the paging response based at least in part on the paging message.

9. The method of claim 1, wherein performing the plurality of transmissions comprises:

transmitting, to a wireless device, position information during an uplink time interval on the anchor channel frequency.

10. The method of claim 1, further comprising:

receiving, from a wireless device, position information during a downlink time interval on the anchor channel frequency.

11. The method of claim 1, further comprising:

performing a measurement of a neighboring cell using the anchor channel frequency; and

adjusting a radio resource management (RRM) parameter based at least in part on the measurement of the neighboring cell.

12. The method of claim 1, wherein:

a transmission duration associated with the anchor channel frequency is less than a transmission duration associated with the set of non-anchor channel frequencies.

13. The method of claim 1, further comprising:

indicating, using transmissions via the anchor channel frequency, at least one non-anchor channel frequency of the set of non-anchor channel frequencies, a hop duration for the at least one non-anchor channel frequency of the set of non-anchor channel frequencies, and a location of the anchor channel frequency with respect to the at least one non-anchor channel frequency of the set of non-anchor channel frequencies.

14. The method of claim 13, wherein:

a channel frequency occupation duration is based at least in part on whether a listen before talk (LBT) procedure is performed on a channel prior to the performing transmissions.

15. The method of claim 1, further comprising:

performing a listen before talk (LBT) procedure prior to performing transmissions sent on a non-anchor channel frequency of the set of non-anchor channel frequencies.

16. The method of claim 1, wherein:

the transmissions performed via the anchor channel frequency comprise an indication of random access channel (RACH) resources.

17. The method of claim 1, wherein:

a bandwidth associated with the anchor channel frequency is less than a bandwidth associated with the set of non-anchor channel frequencies.

18. The method of claim 17, wherein:

the bandwidth associated with the anchor channel frequency comprises a guardband.

19. An apparatus for wireless communication, comprising:

means for identifying a frequency hopping pattern comprising a plurality of hopping frequencies, the plurality of hopping frequencies comprising an anchor channel frequency and a set of non-anchor channel frequencies; and

means for performing a plurality of transmissions over the plurality of hopping frequencies during a hopping interval based at least in part on the frequency hopping pattern, wherein the plurality of transmissions comprise a first number of discovery reference signal (DRS) transmissions on the anchor channel frequency and a second number of transmissions on each non-anchor channel frequency, the first number being greater than or equal to the second number.

20. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

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

identify a frequency hopping pattern comprising a plurality of hopping frequencies, the plurality of hopping frequencies comprising an anchor channel frequency and a set of non-anchor channel frequencies; and

perform a plurality of transmissions over the plurality of hopping frequencies during a hopping interval based at least in part on the frequency hopping pattern, wherein the plurality of transmissions comprise a first number of discovery reference signal (DRS) transmissions sent on the anchor channel frequency and a second number of transmissions sent on each non-anchor channel frequency, the first number being greater than or equal to the second number.

21. The apparatus of claim 20, wherein the instructions are further executable by the processor to:

perform a DRS transmission on the anchor channel frequency after performing one or more of the second number of sent transmissions on one or more non-anchor channel frequencies.

22. The apparatus of claim 20, wherein the instructions are further executable by the processor to:

determine a probability for occupying the anchor channel frequency within the hopping interval, wherein the probability for occupying the anchor channel frequency is greater than a probability for occupying a non-anchor channel frequency of the set of non-anchor channel frequencies.

23. The apparatus of claim 20, wherein the instructions are further executable by the processor to:

perform the first number of DRS transmissions sent on the anchor channel frequency according to a first time division duplex (TDD) configuration; and

perform the second number of transmissions sent on each non-anchor channel frequency according to a second TDD configuration.

24. The apparatus of claim 20, wherein the instructions are further executable by the processor to:

coordinate the plurality of transmissions with other wireless devices, wherein the coordination is based at least in part on avoiding collisions on the anchor channel frequency.

25. The apparatus of claim 20, wherein:

each of the first number of DRS transmissions comprises at least one of;

a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), a master information block (MIB), or a system information block (SIB).

26. The apparatus of claim 20, wherein the instructions are further executable by the processor to:

transmit a paging message on the anchor channel frequency.

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

receive a paging response from a wireless device on the anchor channel frequency, the paging response based at least in part on the paging message.

28. The apparatus of claim 20, wherein the instructions are further executable by the processor to:

receive, from a wireless device, position information during a downlink time interval on the anchor channel frequency.

29. The apparatus of claim 20, wherein:

a transmission duration associated with the anchor channel frequency is less than a transmission duration associated with the set of non-anchor channel frequencies.

30. A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:

identify a frequency hopping pattern comprising a plurality of hopping frequencies, the plurality of hopping frequencies comprising an anchor channel frequency and a set of non-anchor channel frequencies; and

perform a plurality of transmissions over the plurality of hopping frequencies during a hopping interval based at least in part on the frequency hopping pattern, wherein the plurality of transmissions comprise a first number of discovery reference signal (DRS) transmissions on the anchor channel frequency and a second number of transmissions on each non-anchor channel frequency, the first number being greater than or equal to the second number.