Method for improving random access procedure in wireless communications system and related communication device
AssigneeHTC Corporation
InventorChih-Hsiang Wu
Life of this patent
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Abstract
A method for improving a random access procedure for a mobile device of a wireless communication system is disclosed. The method includes initiating the random access procedure, starting a time alignment timer of the mobile device when receiving a time alignment message transmitted by a base station of the wireless communication system, and controlling the random access procedure according to expiry of the time alignment timer, wherein the time alignment timer of the mobile device is used for determining a synchronization state between the mobile device and the base station and the time alignment message is utilized by the base station to update a timing advance for the mobile device.
Claims24
A method for improving a random access procedure for a mobile device of a wireless communication system, the method comprising:
- configuring a time alignment timer of the mobile device to an expiry state when a downlink signaling for triggering the random access procedure is received and the time alignment timer is in a running state, wherein the downlink signaling for triggering the random access procedure is a PDCCH order and is generated due to downlink data arrival;
- and
- according to the expiry of the time alignment timer, performing a resetting process corresponding to a HARQ function and uplink resources of the mobile device.
A communication device of a wireless communication system for improving a random access procedure, the communication device comprising:
- a non-transitory computer readable recording medium for storing program code corresponding to a process;
- and
- a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
- wherein the process comprises:
- configuring a time alignment timer of the communication device to an expiry state when a downlink signaling for triggering the random access procedure is received and the time alignment timer is in a running state, wherein the downlink signaling for triggering the random access procedure is a PDCCH order and is generated due to downlink data arrival;
- and
- according to an expiry of the time alignment timer, performing a resetting process corresponding to a HARQ function and uplink resources of the communication device.
A method for improving a random access procedure for a mobile device of a wireless communication system, the method comprising:
- initiating a random access procedure;
- transmitting a message 3 of the random access procedure to a network;
- aborting the random access procedure after a time alignment timer expires, wherein the time alignment timer is used for indicating whether the mobile device is synchronized with a network on uplink timing;
- and
- discarding a hybrid automatic repeat request negative acknowledgement (HARQ NACK) corresponding to the message 3 of the random access procedure, when the HARQ NACK is received after the time alignment timer expires and the random access procedure is aborted.
A method for improving a random access procedure for a mobile device of a wireless communication system, the method comprising:
- initiating a random access procedure;
- aborting the random access procedure after a time alignment timer expires, wherein the time alignment timer is used for indicating whether the mobile device is synchronized with a network on uplink timing;
- and
- stopping receiving any HARQ feedback associated with the random access procedure after the time alignment timer expires and the random access procedure is aborted.
A method for improving a random access procedure for a mobile device of a wireless communication system, the method comprising:
- initiating a random access procedure;
- continuing the random access procedure when the time alignment timer expires;
- and
- flushing a plurality of HARQ buffers of the mobile device except one of the plurality of HARQ buffers used for transmission of a packet for contention resolution of the random access procedure, wherein the plurality of HARQ buffers correspond to a plurality of HARQ processes.
A method for improving a random access procedure for a mobile device of a wireless communication system, the method comprising:
- initiating a random access procedure;
- continuing the random access procedure when the time alignment timer expires;
- acquiring a packet for contention resolution of the random access procedure from a data buffer used for contention resolution, wherein the packet for contention resolution of the random access procedure is transmitted before the time alignment timer expires;
- and
- transmitting the packet for a retransmission when the HARQ buffer responsible for transmission of the packet is empty and downlink signaling used for adaptive retransmission of the retransmission is received.
A communication device of a wireless communication system for improving a random access procedure, the communication device comprising:
- a non-transitory computer readable recording medium for storing program code corresponding to a process;
- and
- a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
- wherein the process comprises:
- initiating a random access procedure;
- transmitting a message 3 of the random access procedure to a network;
- aborting the random access procedure after a time alignment timer expires, wherein he time alignment timer is used for indicating whether the mobile device is synchronized with a network on uplink timing;
- and
- discarding a hybrid automatic repeat request negative acknowledgement (HARQ NACK) corresponding to the message 3 of the random access procedure, when the HARQ NACK is received after the time alignment timer expires and the random access procedure is aborted.
A communication device of a wireless communication system for improving a random access procedure, the communication device comprising:
- a non-transitory computer readable recording medium for storing program code corresponding to a process;
- and
- a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
- wherein the process comprises:
- initiating a random access procedure;
- aborting the random access procedure after a time alignment timer expires, wherein he time alignment timer is used for indicating whether the mobile device is synchronized with a network on uplink timing;
- and
- stopping receiving any HARQ feedback associated with the random access procedure after the time alignment timer expires and the random access procedure is aborted.
A communication device of a wireless communication system for improving a random access procedure, the communication device comprising:
- a non-transitory computer readable recording medium for storing program code corresponding to a process;
- and
- a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
- wherein the process comprises:
- initiating a random access procedure;
- continuing the random access procedure when the time alignment timer expires;
- and
- flushing a plurality of HARQ buffers of the mobile device except one of the plurality of HARQ buffers used for transmission of a packet for contention resolution of the random access procedure, wherein the plurality of HARQ buffers correspond to a plurality of HARQ processes.
A communication device of a wireless communication system for improving a random access procedure, the communication device comprising:
- a non-transitory computer readable recording medium for storing program code corresponding to a process;
- and
- a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
- wherein the process comprises:
- initiating a random access procedure;
- continuing the random access procedure when the time alignment timer expires;
- acquiring a packet for contention resolution of the random access procedure from a data buffer used for contention resolution, wherein the packet for contention resolution of the random access procedure is transmitted before the time alignment timer expires;
- and
- transmitting the packet for a retransmission when the HARQ buffer responsible for transmission of the packet is empty and downlink signaling used for adaptive retransmission of the retransmission is received.
Dependencies are inferred from the claim text.