Abstract
A method and device for performing a contention based random access procedure by a mobile communication terminal in communication with a base station. The method according to an embodiment includes transmitting a random access preamble message to the base station; receiving a random access response from the base station the random access response including a timing advance command; determining a status of a mobile communication terminal time alignment timer; and ignoring the timing advance command if the mobile communication terminal time alignment timer is determined to be running in the determining step.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Information | ||||||
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Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Information | |||||||||
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S1
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Technologies
Resource configuration Random access Synchronization
Product
User Equipment (UE/Terminal)
Use Cases
Wireless communication
Services
Transmitting/receiving data in uplink
Claim
1. A method of performing a random access procedure by a mobile terminal in communication with a base station, comprising:
starting a time alignment timer upon applying first time alignment information that is received from a base station, the time alignment timer being used to control how long the mobile terminal is considered uplink time aligned;
transmitting a random access preamble to the base station,
wherein the transmitted random access preamble is selected by the mobile terminal;
receiving from the base station a random access response as a response to the random access preamble, the random access response including an uplink resource assignment and second time alignment information;
wherein the random access procedure is a contention based random access procedure, and:
if the time alignment timer is running and contention resolution has not been completed, ignoring the second time alignment information even if the mobile terminal is not time aligned with the base station; and
if the time alignment timer is not running, applying the second time alignment information.
2. The method of claim 1, further comprising:
initiating contention resolution with another mobile terminal trying the random access procedure by transmitting a scheduled message using the uplink resource assignment to the base station.
3. The method of claim 1, wherein the random access preamble is randomly selected by the mobile terminal from a plurality of available random access preambles when the random access procedure is contention based.
4. The method of claim 1, further comprising:
if the time alignment timer is running, storing the second time alignment information and subsequently applying the stored time alignment data after the time alignment timer expires.
5. A mobile terminal configured to perform a random access procedure with a base station, the mobile terminal comprising:
a radio frequency (RF) unit; and
a processor operatively connected to the display and configured to:
start a time alignment timer upon applying first time alignment information that is received from a base station, the time alignment timer being used to control how long the mobile terminal is considered uplink time aligned,
transmit a random access preamble to the base station,
wherein the transmitted random access preamble is selected by the mobile terminal,
receive from the base station a random access response as a response to the random access preamble, the random access response including an uplink resource assignment and second time alignment information,
wherein the random access procedure is a contention based random access procedure, and:
if the time alignment timer is running and contention resolution has not been completed, ignoring the second time alignment information even if the mobile terminal is not time aligned with the base station, and
if the time alignment timer is not running, apply the second time alignment information.
6. The mobile terminal of claim 5, wherein the processor is configured to initiate contention resolution with another mobile terminal trying the random access procedure by transmitting a scheduled message using the uplink resource assignment to the base station when the uplink is synchronized.
7. The mobile terminal of claim 5, wherein the processor is configured to randomly select the random access preamble from a plurality of available random access preambles when the random access procedure is contention based.
8. The mobile terminal of claim 5, wherein, if the time alignment timer is running, the processor is further configured to store the second time alignment information and subsequently apply the stored time alignment data after the time alignment timer expires.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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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.