US 12,764,819 B2Granted

Method and apparatus for performing connection resumption in wireless communication system

AssigneeSignalis Co., Ltd.

InventorSoenghun Kim

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Abstract

A method and apparatus for performing connection resumption is provided. The method includes transmitting UECapabilityInformation to the base station, The UECapabilityInformation includes type 1 SDT support information and type 2 SDT support information, transmitting a message containing the UE NETWORK CAPACITY to the AMF, Specific bits in the UE NETWORK CAPABILITY indicate whether RRC CONNECTION RESUME3 is supported, receiving an RRCRelease from the base station, The RRCRelease comprises a SuspendConfig, In response to receiving said RRCRelease message, entering the RRC_INACTIVE state and performs cell selection, monitoring the paging channel in the selected cell, and initiating RRC CONNECTION RESUME3 or RRC CONNECTION RESUME1 upon receiving a first paging message or a second paging message.

Claims20

Dependent claims

A method performed by a wireless device, the method comprising:

transmitting, to a base station, a first Radio Resource Control (RRC) message, wherein the first RRC message comprises one or more capability parameters;
receiving, from the base station and via a first cell, a second RRC message that suspends an RRC connection and causes an RRC state transition, wherein the second RRC message comprises a suspend configuration including first configuration information for small data transmission (SDT);
transitioning, based on the second RRC message, to an RRC inactive state, wherein the RRC inactive state is different from an RRC idle state;
and
while the wireless device is in the RRC inactive state:
initiating a first SDT procedure associated with a second cell, wherein the first SDT procedure is for uplink data transmission;
transmitting, via the second cell and based on a first random access resource, a first random access preamble associated with the first SDT procedure;
transmitting, via the second cell, a third RRC message requesting a first RRC connection resumption, wherein a resume cause field of the third RRC message is set to a first value selected from a first set of predefined resume cause field values;
transmitting, via the second cell, data associated with the first SDT procedure;
initiating a second SDT procedure associated with the second cell, wherein the second SDT procedure is for downlink data reception;
transmitting, via the second cell and based on a second random access resource, a second random access preamble;
transmitting, via the second cell, a fourth RRC message requesting a second RRC connection resumption, wherein a resume cause field of the fourth RRC message is set to a predefined second value, wherein the predefined second value indicates that the second RRC connection resumption is for the second SDT procedure, and wherein the predefined second value is not equal to any value in the first set of predefined resume cause field values;
and
receiving, via the second cell, data associated with the second SDT procedure.

11 more elements

A wireless device comprising:

a transceiver,
a memory, and
a controller coupled to the transceiver and the memory, wherein the controller is configured to the wireless device to:
transmit, to a base station, a first Radio Resource Control (RRC) message, wherein the first RRC message comprises one or more capability parameters,
receive, from the base station and via a first cell, a second RRC message that suspends an RRC connection and causes an RRC state transition, wherein the second RRC message comprises a suspend configuration including first configuration information for small data transmission (SDT);
transition, based on the second RRC message, to an RRC inactive state, wherein the RRC inactive state is different from an RRC idle state;
and
while the wireless device is in the RRC inactive state:
initiate a first SDT procedure associated with a second cell, wherein the first SDT procedure is for uplink data transmission;
transmit, via the second cell and based on a first random access resource, a first random access preamble associated with the first SDT procedure;
transmit, via the second cell, a third RRC message requesting a first RRC connection resumption, wherein a resume cause field of the third RRC message is set to a first value selected from a first set of predefined resume cause field values;
transmit, via the second cell, data associated with the first SDT procedure;
initiate a second SDT procedure associated with the second cell, wherein the second SDT procedure is for downlink data reception;
transmit, via the second cell and based on a second random access resource, a second random access preamble;
transmit, via the second cell, a fourth RRC message requesting a second RRC connection resumption, wherein a resume cause field of the fourth RRC message is set to a predefined second value, wherein the predefined second value indicates that the second RRC connection resumption is for the second SDT procedure, and wherein the predefined second value is not equal to any value in the first set of predefined resume cause field values;
and
receive, via the second cell, data associated with the second SDT procedure.

14 more elements

Dependencies are inferred from the claim text.