Abstract
A method is provided for performing a random access procedure in a mobile communication system. The method includes receiving a random access response message from a Base Station (BS); transmitting a message including a Cell-Radio Network Temporary Identifier (C-RNTI) to the BS, if the C-RNTI exists; and determining that a contention for the random access procedure is resolved successfully, when User Equipment (UE)-specific control information addressable by the C-RNTI is received from the BS.
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Technologies
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Use Cases
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Claim
1. A method for performing a random access procedure by a user equipment (UE) in a mobile communication system, the method comprising:
transmitting, to a base station, a random access preamble on a random access channel;
receiving, from the base station, a random access response including grant information indicating uplink resources and a temporary-radio network temporary identifier (T-RNTI), in response to the transmitted random access preamble;
transmitting, to the base station, a message including a cell-radio network temporary identifier (C-RNTI) for identifying the UE in a cell through the uplink resources, the uplink resources being allocated to the UE based on the grant information, in response to the received random access response;
receiving, from the base station, UE-specific control information based on the C-RNTI on one downlink control channel, in response to the transmitted message; and
determining that a contention for the random access procedure is resolved, based on the received UE-specific control information, without receiving a contention resolution (CR) message based on the T-RNTI,
wherein the UE-specific control information includes a cyclic redundancy check (CRC) specified by the C-RNTI in the transmitted message.
2. The method of claim 1, wherein the UE-specific control information is mapped to UE identification information or includes the UE identification information, the UE identification information including at least one of the C-RNTI and a scrambling code of the UE.
3. A user equipment (UE) for performing a random access procedure in a mobile communication system, the UE comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmit, to a base station, a random access preamble on a random access channel,
receive, from the base station, a random access response including grant information indicating uplink resources and a temporary-radio network temporary identifier (T-RNTI), in response to the transmitted random access preamble;
transmit, to the base station, a message including a cell-radio network temporary identifier (C-RNTI) for identifying the UE in a cell through the uplink resources, the uplink resources being allocated to the UE based on the grant information, if the C-RNTI exists,
transmit, to the base station, a message including one of a unique identifier (ID) of the UE and a random ID through the uplink resources, if the C-RNTI does not exist,
determine that a contention fot the random access procedure is resolved, if UE-specific control information is received based on the C-RNTI on one downlink control channel, without receiving a contention resolution (CR) message based in the T-RNTI, and
determine that the contention for the random access procedure is resolved, if the CR message including the one of the unique ID of the UE and the random ID is received based on the T-RNTI,
wherein the UE-specific control information includes a cyclic redundancy check (CRC) specified by the C-RNTI in the transmitted message.
4. The UE of claim 3, wherein the UE-specific control information is mapped to UE identification information or includes the UE identification information, the UE identification information including at least one of the C-RNTI and a scrambling code of the UE.
5. A method for performing a random access procedure by a base station in a mobile communication system, the method comprising:
receiving, from a user equipment (UE), a random access preamble on a random access channel;
transmitting, to the UE, a random access response including grant information indicating uplink resources and a temporary-radio network temporary identifier (T-RNTI), in response to the received random access preamble;
receiving, from the UE, a message including a cell-radio network temporary identifier (C-RNTI) for identifying the UE in a cell through the uplink resources, the uplink resources being allocated to the UE based on the grant information, in response to the transmitted random access response; and
transmitting, to the UE, UE-specific control information based on the C-RNTI on one downlink control channel, without transmitting a contention resolution (CR) message based on the T-RNTI, in response to the received message,
whereing the UE-specific control information includes a cyclic redundancy check (CRC) specified by the C-RNTI in the received message.
6. The method of claim 5, wherein the UE-specific control information is mapped to UE identification information or includes the UE identification information, the UE identification information including at least one of the C-RNTI and a scrambling code of the UE.
7. A base station for performing a random access procedure in a mobile communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
receive, from a user equipment (UE), a random access preamble on a random access channel,
transmit, to the UE, a random access response including grant information indicating uplink resources and a temporary-radio network temorary identifier (T-RNTI), in response to the received random access preamble,
receive, from the UE, a message through the uplink resources, the uplink resources being allocated to the UE based on the grant information;
transmit, to the UE, a contention resolution (CR) message including one of a unique identifier (ID) of the UE and a random ID, based on the T-RNTI, if the received message does not inlcude a cell-radio network temporary identifier (C-RNTI) for identifying the UE in a cell, and
transmit, to the UE, UE-specific control information on one downlink control channel, without transmitting the CR message based on the T-RNTI, if the received message includes the C-RNTI,
wherein the UE-specific control information includes a cyclic redundancy check (CRC) specified by the C-RNTI in the received message.
8. The base station of claim 7, wherein the UE-specific control information is mapped to UE identification information or includes the UE identification information, the UE identification information including at least one of the C-RNTI and a scrambling code of the UE.
9. The method of claim 1, further comprising:
starting a timer for collision detection in the random access procedure upon transmitting the message including the C-RNTI; and
determining that the contention for the random access procedure is resolved, based on the received UE-specific control information before expiration of the timer.
10. The UE of claim 3, wherein the controller is further configured to:
start a timer for collision detection in the random access procedure if the message including the C-RNTI is transmitted; and
determine that the contention for the random access procedure is resolved, if the UE-specific control information is received based on the C-RNTI on the one downlink control channel before expiration of the timer.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.