Method and apparatus for transmission using Preconfigured Uplink Resources while in RRC idle or RRC inactive in a wireless communication system
First Claim
1. A method of a User Equipment (UE), comprising:
- receiving, from a network node, a configuration of Preconfigured Uplink Resources (PUR) including a first Radio Network Temporary Identifier (RNTI) when the UE is in RRC_CONNECTED state;
determining to use the PUR for transmitting a first Radio Resource Control (RRC) message, or to initiate a Random Access (RA) procedure for transmitting the first RRC message based on whether the PUR is available or not;
transmitting, using the PUR, the first RRC message when the UE is in RRC_IDLE or RRC_INACTIVE state;
receiving, from the network node, a second RRC message in response to transmission of the first RRC message; and
entering RRC_CONNECTED state and setting a Cell Radio Network Temporary Identifier (C-RNTI) to a value of the first RNTI, in response to reception of the second RRC message,wherein the UE determines whether the PUR is available or not at least based on if Time Alignment (TA) is valid, and wherein whether the TA is valid or not is at least based on Serving Cell Reference Signal Received Power (RSRP) changes.
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Abstract
A method and apparatus are disclosed from the perspective of a User Equipment (UE). In one embodiment, the method includes receiving, from a network node, a configuration of Preconfigured Uplink Resources (PUR), when the UE is in RRC_CONNECTED state, wherein the PUR is used for a transmission when the UE is in RRC_IDLE state. The method also includes determining to generate a first Radio Resource Control (RRC) message or a second RRC message for the transmission based on whether the transmission is to be transmitted using the PUR or not, wherein the first RRC message includes a UE identity and the second RRC message does not include the UE identity. The method further includes performing the transmission including the first RRC message or the second RRC message when the UE is in RRC_IDLE state.
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Citations
18 Claims
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1. A method of a User Equipment (UE), comprising:
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receiving, from a network node, a configuration of Preconfigured Uplink Resources (PUR) including a first Radio Network Temporary Identifier (RNTI) when the UE is in RRC_CONNECTED state; determining to use the PUR for transmitting a first Radio Resource Control (RRC) message, or to initiate a Random Access (RA) procedure for transmitting the first RRC message based on whether the PUR is available or not; transmitting, using the PUR, the first RRC message when the UE is in RRC_IDLE or RRC_INACTIVE state; receiving, from the network node, a second RRC message in response to transmission of the first RRC message; and entering RRC_CONNECTED state and setting a Cell Radio Network Temporary Identifier (C-RNTI) to a value of the first RNTI, in response to reception of the second RRC message, wherein the UE determines whether the PUR is available or not at least based on if Time Alignment (TA) is valid, and wherein whether the TA is valid or not is at least based on Serving Cell Reference Signal Received Power (RSRP) changes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A User Equipment (UE), comprising:
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a control circuit; a processor installed in the control circuit; and a memory installed in the control circuit and operatively coupled to the processor; wherein the processor is configured to execute a program code stored in the memory to; receive, from a network node, a configuration of Preconfigured Uplink Resources (PUR) including a first Radio Network Temporary Identifier (RNTI) when the UE is in RRC_CONNECTED state; determine to use the PUR for transmitting a first Radio Resource Control (RRC) message, or to initiate a Random Access (RA) procedure for transmitting the first RRC message based on whether the PUR is available or not; transmit, using the PUR, the first RRC message when the UE is in RRC_IDLE or RRC_INACTIVE state; receive, from the network node, a second RRC message in response to transmission of the first RRC message; and enter RRC_CONNECTED state and set a Cell Radio Network Temporary Identifier (C-RNTI) to a value of the first RNTI, in response to reception of the second RRC message, wherein the UE determines whether the PUR is available or not at least based on if Time Alignment (TA) is valid, and wherein whether the TA is valid or not is at least based on Serving Cell Reference Signal Received Power (RSRP) changes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification