Techniques for transmitting a sounding reference signal or scheduling request over an unlicensed radio frequency spectrum band

Patent metadata

Field	Value
Publication number	US-2016100407-A1
Application number	US-201514870543-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Oct 7, 2014
Publication date	Apr 7, 2016
Grant date	—

Abstract

Techniques are described for wireless communication. A first method includes receiving from a base station an indication of a set of one or more uplink interlaces of an unlicensed radio frequency spectrum band allocated for a sounding reference signal, and transmitting the sounding reference signal for a user equipment (UE) over the indicated set of one or more uplink interlaces of the unlicensed radio frequency spectrum band. A second method includes receiving an indication of an interlace of an unlicensed radio frequency spectrum band allocated for a physical uplink control channel (PUCCH) transmission, and transmitting a scheduling request and a buffer status report over the indicated interlace.

First claim

What is claimed is:

1 . A method for wireless communication, comprising:
receiving from a base station an indication of a set of one or more uplink interlaces of an unlicensed radio frequency spectrum band allocated for a sounding reference signal; and transmitting the sounding reference signal for a user equipment (UE) over the indicated set of one or more uplink interlaces of the unlicensed radio frequency spectrum band.

2 . The method of claim 1 , further comprising:
receiving from the base station an indication of at least one of an uplink subframe or a symbol of an uplink subframe in which the sounding reference signal is to be transmitted.

3 . The method of claim 1 , wherein the set of one or more uplink interlaces comprises a plurality of resource blocks, further comprising:
determining a sounding reference signal sequence for a resource block of the set of one or more uplink interlaces based at least in part on a location of the resource block within the set of one or more uplink interlaces.

4 . The method of claim 3 , wherein the sounding reference signal sequence for the resource block is based at least in part on an uplink interlace associated with the resource block.

5 . The method of claim 3 , further comprising:
determining at least one of a UE identifier or a cell identifier; wherein the sounding reference signal sequence for the resource block is based at least in part on the UE identifier or the cell identifier.

6 . The method of claim 1 , wherein each uplink interlace of the set of one or more uplink interlaces comprises a plurality of subcarriers, and wherein transmitting the sounding reference signal comprises:
transmitting the sounding reference signal for the UE over one or more subcarriers from the plurality of subcarriers.

7 . The method of claim 1 , further comprising:
receiving an indication from the base station that the set of one or more uplink interlaces is designated for sounding reference signal transmissions by UEs that are not scheduled to transmit the sounding reference signal during a frame; and determining that the UE is not scheduled to transmit the sounding reference signal to the base station during the frame, and determining that the UE has an allocated physical uplink shared channel (PUSCH) during the frame; wherein the sounding reference signal is transmitted over the set of one or more uplink interlaces in response to the determinations.

8 . The method of claim 1 , wherein the set of one or more uplink interlaces allocated for the sounding reference signal is based at least in part on at least one of a distance between the base station and the UE or a transmit power of the UE.

9 . An apparatus for wireless communication, comprising:
a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive from a base station an indication of a set of one or more uplink interlaces of an unlicensed radio frequency spectrum band allocated for a sounding reference signal; and
transmit the sounding reference signal for a user equipment (UE) over the indicated set of one or more uplink interlaces of the unlicensed radio frequency spectrum band.

10 . The apparatus of claim 9 , wherein the instructions are executable by the processor to:
receive from the base station an indication of at least one of an uplink subframe or a symbol of an uplink subframe in which the sounding reference signal is to be transmitted.

11 . The apparatus of claim 9 , wherein the set of one or more uplink interlaces comprises a plurality of resource blocks, and wherein the instructions are executable by the processor to:
determine a sounding reference signal sequence for a resource block of the set of one or more uplink interlaces based at least in part on a location of the resource block within the set of one or more uplink interlaces.

12 . The apparatus of claim 11 , wherein the sounding reference signal sequence for the resource block is based at least in part on an uplink interlace associated with the resource block.

13 . The apparatus of claim 11 , wherein the instructions are executable by the processor to:
determine at least one of a UE identifier or a cell identifier; wherein the sounding reference signal sequence for the resource block is based at least in part on the UE identifier or the cell identifier.

14 . The apparatus of claim 9 , wherein each uplink interlace of the set of one or more uplink interlaces comprises a plurality of subcarriers, and wherein the instructions are executable by the processor to:
transmit the sounding reference signal for the UE over one or more subcarriers from the plurality of subcarriers.

15 . The apparatus of claim 9 , wherein the instructions are executable by the processor to:
receive an indication from the base station that the set of one or more uplink interlaces is designated for sounding reference signal transmissions by UEs that are not scheduled to transmit the sounding reference signal during a frame; and determine that the UE is not scheduled to transmit the sounding reference signal to the base station during the frame, and determine that the UE has an allocated physical uplink shared channel (PUSCH) during the frame; wherein the sounding reference signal is transmitted over the set of one or more uplink interlaces in response to the determinations.

16 . The apparatus of claim 9 , wherein the set of one or more uplink interlaces allocated for the sounding reference signal is based at least in part on at least one of a distance between the base station and the UE or a transmit power of the UE.

17 . A method for wireless communication, comprising:
receiving an indication of an interlace of an unlicensed radio frequency spectrum band allocated for a physical uplink control channel (PUCCH) transmission; and transmitting a scheduling request and a buffer status report over the indicated interlace.

18 . The method of claim 17 , further comprising:
transmitting at least one of a power headroom report or a logical group identifier with the scheduling request and the buffer status report over the indicated interlace.

19 . The method of claim 17 , further comprising:
transmitting a cyclic redundancy check for at least the scheduling request and the buffer status report over the indicated interlace; and adjusting a size of the cyclic redundancy check based at least in part on a remaining number of bits in the indicated interlace.

20 . The method of claim 17 , wherein the scheduling request and the buffer status report are transmitted using one of a plurality of predefined physical uplink control channel (PUCCH) formats.

21 . The method of claim 20 , further comprising:
selecting a PUCCH format based at least in part on at least one of a size of the buffer status report or a size of a payload to be transmitted over the indicated interlace.

22 . The method of claim 17 , further comprising:
multiplexing transmission of the scheduling request and the buffer status report over the indicated interlace with a transmission of uplink control information (UCI).

23 . The method of claim 22 , wherein the UCI comprises at least one of: an logical group identifier acknowledgement (ACK), a non-acknowledgement (NAK), or a number of channel quality indicator (CQI) reports.

24 . An apparatus fo

Assignees

• Qualcomm Inc

Inventors

• Gaal Peter
• Yerramalli Srinivas
• Luo Tao
• Malladi Durga Prasad
• Bhushan Naga
• Wei Yongbin
• Damnjanovic Aleksandar
• Xu Hao
• Chen Wanshi
• Patel Shimman Arvind
• Zhang Xiaoxia

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04L5/0069

  Allocation based on distance or geographical location · CPC title

• H04L27/0006

  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 title

• H04L5/0041

  Frequency-non-contiguous · CPC title