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1. WO2020221586 - USER EQUIPMENT INVOLVED IN MONITORING A DOWNLINK CONTROL CHANNEL

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A user equipment, UE, comprising :

processing circuitry, which in operation, operates a function that involves monitoring of a downlink control channel of an unlicensed radio cell for information intended to the UE, the unlicensed radio cell operating in an unlicensed spectrum and being controlled by a base station that is in communication with the user equipment,

the processing circuitry and a receiver, which in operation, perform the monitoring of the downlink control channel based on a first timer and a second timer operated in parallel,

wherein the first timer is used to limit the maximum time the downlink control channel is to be monitored, by starting the first timer at the beginning of the monitoring of the downlink control channel and stopping the monitoring of the downlink control channel upon expiry of the first timer,

wherein the second timer is used to stop the monitoring of the downlink control channel earlier than the first timer depending on the channel occupation status of the unlicensed spectrum of the radio cell by the base station.

2. The user equipment according to claim 1 ,

wherein the second timer is operated to accumulate the time the downlink control channel is being monitored during a time where the unlicensed spectrum is occupied by the base station, optionally wherein the second timer runs during the time where the unlicensed spectrum is occupied by the base station,

optionally wherein the monitoring of the downlink control channel is performed while any of the two timers are running, and wherein upon expiry of either of the first and second timers, the monitoring of the downlink control channel is stopped,

optionally wherein the second timer is started when the base station occupies the unlicensed spectrum for the first time after start of the first timer, the second timer is paused when the base station does not occupy the unlicensed spectrum, and the second timer is resumed when the base station occupies again the unlicensed spectrum.

3. The user equipment according to claim 2, wherein the function is a paging message monitoring function, wherein the downlink control channel is monitored for receiving a paging message, and upon receiving the paging message, the first timer, the second timer

and the monitoring of the downlink control channel for the paging message monitoring function are stopped until a next paging interval; optionally wherein the first timer counts the length of one or more paging occasions, and the second timer counts the length of the one or more paging occasions during the time where the unlicensed spectrum is occupied by the base station, and/or

wherein the function is a system information acquisition function, wherein the downlink control channel is monitored for receiving a system information message, and upon receiving the system information message, the first timer, the second timer and the monitoring of the downlink control channel for the system information acquisition function are stopped until a next time the UE needs to acquire the system information , optionally wherein the first timer counts the length of one or more system information acquisition windows, and the second timer counts the length of one or more system information acquisition windows during the time where the unlicensed spectrum is occupied by the base station, and/or

wherein the function is a signaling monitoring operation for a Discontinued Reception, DRX, function, wherein the downlink control channel is monitored for any downlink control information on the downlink control channel directed to the user equipment, and upon receiving said downlink control information, the first timer and the second timer are stopped and the monitoring of the downlink control channel is continued, optionally wherein the first timer counts a length of a DRX On duration and the second timer counts a length of the DRX On Duration during the time where the unlicensed spectrum is occupied by the base station, and/or

wherein the function is an inactivity monitoring operation for a Discontinued Reception, DRX, function, wherein the downlink control channel is monitored for any downlink control information on the downlink control channel directed to the user equipment, and upon receiving said downlink control information, the first timer and the second timer are restarted and the monitoring of the downlink control channel is continued, optionally wherein the first timer counts a length of DRX inactive duration, and the second timer counts a length of the DRX inactive duration during the time where the unlicensed spectrum is occupied by the base station, and/or

wherein the function is a random access response reception for a random access function, wherein the downlink control channel is monitored for a random access response message transmitted by the base station in response to a random access preamble transmitted before by the user equipment to the base station, and upon receiving said random access response, the first timer and the second timer are stopped and the next step of the random access function is performed, optionally wherein the first timer counts the length of the random access response window, and the second timer counts the length of the random access response window during the time where the unlicensed spectrum is occupied by the base station, and/or

wherein the function is a reordering function of a Packet Data Convergence Protocol, PDPC, layer, wherein the downlink control channel is monitored for missing out-of- sequence data directed to the user equipment, and upon receiving said missing out-of- sequence data, the first timer and the second timer are stopped until the next time when out-of-sequence delivery of data is detected and the monitoring of the downlink control channel is continued, optionally wherein the first timer counts the length of the reordering time window, and the second timer counts the length of the reordering time window during the time where the unlicensed spectrum is occupied by the base station.

4. The user equipment according to claim 1 ,

wherein upon expiry of the second timer, the processing circuitry, when in operation, determines whether the base station has currently occupied the unlicensed spectrum,

when the base station has currently occupied the unlicensed spectrum, the monitoring is stopped at the end of the current channel occupation of the unlicensed spectrum and optionally the first timer is stopped,

when the base station has not currently occupied the unlicensed spectrum, the monitoring is performed until expiry of the first timer,

optionally wherein the second timer is started at the same time when the first timer is started.

5. The user equipment according to claim 4, wherein the function is a paging message monitoring function, wherein the downlink control channel is monitored for receiving a paging message, and upon receiving the paging message, the first timer, the second timer and the monitoring of the downlink control channel for the paging message monitoring function are stopped until a next paging interval; optionally wherein the first and second timer count the length of one or more paging occasions, and/or

wherein the function is a system information acquisition function, wherein the downlink control channel is monitored for receiving a system information message, and upon receiving the system information message, the first timer, the second timer and the

monitoring of the downlink control channel for the system information acquisition function are stopped until a next time the UE needs to acquire the system information , optionally wherein the first and second timer count the length of one or more system information acquisition windows; and/or

wherein the function is a signaling monitoring operation for a Discontinued Reception, DRX, function, wherein the downlink control channel is monitored for any downlink control information on the downlink control channel directed to the user equipment, and upon receiving said downlink control information, the first timer and the second timer are stopped, the monitoring of the downlink control channel is continued and optionally a timer for a DRX inactive duration is started, optionally wherein the first and second timer count a length of a DRX On duration, and/or

wherein the function is an inactivity monitoring operation for a Discontinued Reception, DRX, function, wherein the downlink control channel is monitored for any downlink control information on the downlink control channel directed to the user equipment, and upon receiving said downlink control information, the first timer and the second timer are restarted and the monitoring of the downlink control channel is continued, optionally wherein the first and second timer count a length of DRX inactive duration, and/or

wherein the function is a random access response reception for a random access function, wherein the downlink control channel is monitored for a random access response message transmitted by the base station in response to a random access preamble transmitted before by the user equipment to the base station, and upon receiving said random access response, the first timer and the second timer are stopped and the next step of the random access function is performed, optionally wherein the first and second timer count the length of the random access response window, and/or

wherein the function is a reordering function of a Packet Data Convergence Protocol, PDPC, layer, wherein the downlink control channel is monitored for missing out-of- sequence data directed to the user equipment, and upon receiving said missing out-of- sequence data, the first timer and the second timer are stopped until the next time when out-of-sequence delivery of data is detected and the monitoring of the downlink control channel is continued, optionally wherein the first and the second timer count the length of the reordering time window.

6. The user equipment according to any of claims 1 to 5, wherein the processing circuitry determines the channel occupation by a base station based on a channel occupation signal received by the receiver from the base station,

optionally wherein the channel occupation signal is transmitted by the base station when the base station occupies the unlicensed spectrum and is not transmitted by the base station when the base station does not occupy the unlicensed spectrum,

optionally wherein the channel occupation signal indicates an occupation length of the unlicensed spectrum by the base station.

7. The user equipment according to any of claims 1 to 6,

wherein the receiver, when in operation, receives configuration information from the base station, configuring a first timer value for the first timer, wherein the processing circuitry, when in operation, determines a second timer value for the second timer based on a fraction of the timer value for the first timer, optionally wherein the fraction is determined based on the received configuration information, optionally wherein the same fraction is used for determine the second timer value of the second timer for one or more of the operated functions according to claim 8,

or

wherein the receiver, when in operation, receives configuration information from the base station, configuring a first timer value for the first timer and a second timer value for the second timer,

optionally wherein the second timer value for the second timer is smaller than the first timer value for the first timer,

optionally wherein the configuration information is received using a Radio Resource Control, RRC, protocol message.

8. The user equipment according to any of claims 1 to 7, wherein the operated function is one of the following functions operated by the user equipment:

• a paging message monitoring function,

• a system information acquisition function,

• signaling monitoring operation for a Discontinued Reception, DRX, function,

inactivity monitoring operation for a Discontinued Reception, DRX, function,

random access response reception for a random access function, and

• reordering function of a Packet Data Convergence Protocol, PDCP, layer,

optionally wherein the UE operates one or more of the above functions, and each of the operated function separately involves the monitoring of the downlink control channel and the operation of the first timer and the second timer according to one of the above claims 1 to 7.

9. The user equipment according to any of claims 1 to 8, wherein a first timer value for the first timer and a second timer value for the second timer are configured for operation of the function in an unlicensed radio cell, and wherein a different first timer value for the first timer is configured for operation of the function in a licensed radio cell, wherein the different first timer value in the licensed radio cell is smaller than the first timer value in the unlicensed radio cell,

optionally wherein the second timer value for the second timer is the same as the first timer value for the first timer configured for operation in a licensed radio cell.

10. A base station, comprising:

processing circuitry, which in operation, operates a function that involves transmitting information to a user equipment, UE, via a downlink control channel of an unlicensed radio cell that is monitored by the UE for the information intended to the UE, the unlicensed radio cell operating in an unlicensed spectrum and being controlled by the base station that is in communication with the user equipment,

the processing circuitry, which in operation, determines when the UE monitors the downlink control channel based on a first timer and a second timer operated in parallel for determining when to transmit the information to the UE via the downlink control channel,

wherein the first timer is used to limit the maximum time the downlink control channel is to be monitored by the UE, by starting the first timer at the beginning of the monitoring of the downlink control channel and stopping the monitoring of the downlink control channel upon expiry of the first timer,

wherein the second timer is used to stop the monitoring of the downlink control channel earlier than the first timer depending on the channel occupation status of the unlicensed spectrum of the radio cell by the base station,

a transmitter, which in operation, transmits the information to the UE on the downlink control channel based on the previous determination based on the first and second timers.

11. The base station according to claim 10, wherein the transmitter, when in operation, transmits configuration information to the UE, for configuring a first timer value for the first timer, and wherein the processing circuitry, when in operation, determines a second timer value for the second timer based on a fraction of the timer value for the first timer, optionally wherein the transmitter, when in operation, transmits the configuration information about the fraction to the UE, or

wherein the transmitter, when in operation, transmits configuration information to the UE, for configuring a first timer value for the first timer and a second timer value for the second timer,

optionally wherein the second timer value for the second timer is smaller than the first timer value for the first timer,

optionally wherein the configuration information is transmitted using a Radio Resource Control, RRC, protocol message.

12. A method comprising the following steps performed by a user equipment, UE:

operating a function that involves monitoring of a downlink control channel of an unlicensed radio cell for information intended to the UE, the unlicensed radio cell operating in an unlicensed spectrum and being controlled by a base station that is in communication with the user equipment,

performing the monitoring of the downlink control channel based on a first timer and a second timer operated in parallel,

wherein the first timer is used to limit the maximum time the downlink control channel is to be monitored, by starting the first timer at the beginning of the monitoring of the downlink control channel and stopping the monitoring of the downlink control channel upon expiry of the first timer,

wherein the second timer is used to stop the monitoring of the downlink control channel earlier than the first timer depending on the channel occupation status of the unlicensed spectrum of the radio cell by the base station.