Method and device for uplink transmission by using unlicensed spectrum

Patent metadata

Field	Value
Publication number	US-2016302076-A1
Application number	US-201615080994-A
Country	US
Kind code	A1
Filing date	Mar 25, 2016
Priority date	Apr 13, 2015
Publication date	Oct 13, 2016
Grant date	—

Abstract

A method, adapted to a communication device, for uplink transmission by using unlicensed spectrum is provided. The method includes following steps. Acquiring transmission resource based on a listen-before-talk (LBT) procedure. Sending an LBT indicator to a base station after successfully acquiring the transmission resource. Receiving a uplink resource grant from the base station. Performing uplink data transmission with the base station on the unlicensed spectrum according to the uplink resource grant.

First claim

What is claimed is:

1 . A communication method, adapted to a communication device, for uplink transmission by using unlicensed spectrum, comprising:
acquiring transmission resource from the unlicensed spectrum based on a listen-before-talk (LBT) procedure; sending an LBT success indicator to a base station after successfully acquiring the transmission resource from the unlicensed spectrum; receiving a uplink resource grant from the base station; and performing uplink data transmission with the base station on the unlicensed spectrum according to the uplink resource grant.

2 . The communication method according to claim 1 , further comprising:
after sending the LBT success indicator, sending a plurality of preamble signals to the based station, and obtaining a random access response (RAR) from the base station; using a time advancement (TA) value in the RAR to adjust transmission timing of signals; and based on the adjusted transmission timing of signals, performing the uplink data transmission with the base station on the unlicensed spectrum.

3 . The communication method according to claim 2 , further comprising:
transmitting the preamble signals with different transmission powers.

4 . The communication method according to claim 2 , further comprising:
transmitting the preamble signals with a maximum transmission power.

5 . The communication method according to claim 2 , further comprising:
obtaining a preamble signal identifier (ID) from the RAR, wherein the preamble signal ID corresponds a selected preamble signal of the preamble signals; and adjusting transmission power to a level corresponding to the transmission power of the selected preamble signal.

6 . The communication method according to claim 1 , further comprising:
after successfully acquiring the transmission resource from the unlicensed spectrum, sending one or more reservation signals on the unlicensed spectrum to occupy the transmission resource, or sending a network allocation value (NAV) signaling through a wireless network to occupy the transmission resource.

7 . The method according to claim 1 , further comprising:
in respond to a mute discontinuous reception (DRX) command, prohibiting from entering a sleep mode during a sleep period of a DRX cycle.

8 . The communication method according to claim 1 , further comprising:
switching between a wakeup mode and a sleep mode based on a first DRX cycle; and after receiving a measurement configuration information, switching from the first DRX cycle to a second DRX cycle; wherein the second DRX cycle is shorter than the first DRX cycle.

9 . The communication method according to claim 1 , further comprising:
measuring one or more channels on the unlicensed spectrum to send back a report to the base station, wherein the report comprises a list including channel entries ordered by channel quality.

10 . The communication method according to claim 1 , further comprising:
measuring one or more channels on the unlicensed spectrum to send back a report to the base station, wherein the report comprises a mapping table of channel measurement results, in which channels in the unlicensed spectrum occupied by radar or other high prioritized equipment are marked.

11 . The communication method according to claim 1 , further comprising:
measuring one or more channels on the unlicensed spectrum according to a measurement configuration information to make a report; and sending back the report to the base station, such that the base station uses the report to select a channel from the unlicensed spectrum for the uplink data transmission.

12 . The communication method according to claim 11 , further comprising:
receiving the measurement configuration information from the base station, wherein the measurement configuration information comprises a timer; and sending back the report before the timer expired, otherwise considering the report as invalid.

13 . The communication method according to claim 11 , further comprising:
receiving a channel selection result from the base station, wherein the channel selection result is generated by the base station based on a channel measurement procedure; performing another channel measurement procedure on a candidate channel indicated by the channel selection result, and sending back a result of the another channel measurement procedure to the base station, such that the base station uses the result of the another channel measurement procedure to select a channel from the unlicensed spectrum for the uplink data transmission.

14 . A communication device, adapted to performing uplink transmission by using unlicensed spectrum, comprising:
a transceiver; and a processing circuit, coupled to the transceiver and configured for:
acquiring transmission resource from the unlicensed spectrum based on a listen-before-talk (LBT) procedure;
sending an LBT success indicator to a base station after successfully obtaining the transmission resource from the unlicensed spectrum;
receiving a uplink resource grant from the base station; and
controlling the transceiver to perform uplink data transmission with the base station on the unlicensed spectrum according to the uplink resource grant.

15 . The communication device according to claim 14 , wherein after sending the LBT success indicator, the communication device controls the transceiver to send a plurality of preamble signals to the base station, obtains a random access response (RAR) from the base station, uses a time advancement (TA) value in the RAR to adjust transmission timing of signals, and based on the adjusted transmission timing of signals, controls the transceiver to perform the uplink data transmission with the base station on the unlicensed spectrum.

16 . The communication device according to claim 15 , wherein the processing circuit controls the transceiver to transmit the preamble signals with different transmission powers.

17 . The communication device according to claim 15 , wherein the processing circuit controls the transceiver to transmit the preamble signals with a maximum transmission power.

18 . The communication device according to claim 15 , wherein the processing circuit obtains a preamble signal identifier (ID) corresponding to a selected preamble signal of the preamble signals from the RAR, and adjusts transmission power of the transceiver to a level corresponding to the transmission power of the selected preamble signal.

19 . The communication device according to claim 14 , wherein, after the communication device successfully acquires the transmission resource from the unlicensed spectrum, the processing circuit controls the transceiver to send one or more reservation signals to occupy the transmission resource on the unlicensed spectrum, or to send a network allocation value (NAV) signaling through a wireless network to occupy the transmission resource.

20 . The communication device according to claim 14 , wherein in response to a mute discontinuous reception (DRX) command, the processing circuit prohibits the communication device from entering a sleep mode during a sleep period of a DRX cycle.

21 . The communication device according to claim 14 , wherein the communication device switches between a wakeup mode and a sleep mode based on a first DRX cycle, and when the transceiver receives a measurement configuration information, the communication device switches from the first DRX cycle to a second DRX cycle;
wherein th

Assignees

• Ind Tech Res Inst

Inventors

• Chou Chie-Ming
• Chen Chun-Chia

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/21 Primary

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

• H04W16/14 Primary

  Spectrum sharing arrangements {between different networks} · CPC title

• H04W52/0225

  using monitoring of external events, e.g. the presence of a signal · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title