Method for detecting failures of random access procedures
First Claim
1. A method of detecting a failure of a random access procedure, the method comprising:
- transmitting, by a mobile terminal, a random access preamble;
monitoring, by a mobile terminal, a first physical downlink control channel (PDCCH) to check if a random access response (RAR) including information related to the random access preamble matching the transmitted random access preamble is received within a random access response window,transmitting, by the mobile terminal, uplink data according to the RAR to a base station when the RAR is received;
monitoring, by the mobile terminal, a reception of a second PDCCH to check whether contention resolution is successful until a timer for the contention resolution expires;
if the contention resolution is not successful, incrementing, by the mobile terminal, a preamble transmission counter by 1;
if a value of the preamble transmission counter is equal to a maximum value of the preamble transmission +1, indicating, by the mobile terminal, to an upper layer that there is a problem with the random access procedure; and
applying, by the mobile terminal, a back-off time to delay a transmission of a subsequent random access preamble.
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Accused Products
Abstract
A method of performing a random access channel (RACH) procedure between a mobile terminal and a network includes the steps of detecting whether a random access response (RAR) is received from the network within a certain time period, the RAR including information about a random access channel (RACH) preamble transmitted to the network; and if the RAR is not received within the certain time period or if the information about the transmitted RACH preamble included in the RAR does not match the transmitted RACH preamble, performing a first procedure to detect failures in the RACH procedure; and if the RAR is received within the certain time period and if the information about the transmitted RACH preamble included in the RAR matches the transmitted RACH preamble, performing a second procedure to detect failures in the RACH procedure.
84 Citations
16 Claims
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1. A method of detecting a failure of a random access procedure, the method comprising:
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transmitting, by a mobile terminal, a random access preamble; monitoring, by a mobile terminal, a first physical downlink control channel (PDCCH) to check if a random access response (RAR) including information related to the random access preamble matching the transmitted random access preamble is received within a random access response window, transmitting, by the mobile terminal, uplink data according to the RAR to a base station when the RAR is received; monitoring, by the mobile terminal, a reception of a second PDCCH to check whether contention resolution is successful until a timer for the contention resolution expires; if the contention resolution is not successful, incrementing, by the mobile terminal, a preamble transmission counter by 1; if a value of the preamble transmission counter is equal to a maximum value of the preamble transmission +1, indicating, by the mobile terminal, to an upper layer that there is a problem with the random access procedure; and applying, by the mobile terminal, a back-off time to delay a transmission of a subsequent random access preamble. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile terminal for detecting a failure of a random access procedure comprising:
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a transceiver that transmits a random access preamble; and a processor that controls the transceiver and monitors a first physical downlink control channel (PDCCH) to check if a random access response (RAR) including information related to the random access preamble matching the transmitted random access preamble is received within a random access response window, transmits uplink data according to the RAR to a base station when the RAR is received; monitors a second PDCCH to check whether contention resolution is successful until a timer for the contention resolution expires; if the contention resolution is not successful, increments a preamble transmission counter by 1; if a value of the preamble transmission counter is equal to a maximum value of the preamble transmission +1, indicates to an upper layer that there is a problem with the random access procedure; and applies a back-off time to delay a transmission of a subsequent random access preamble. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification