Methods and apparatus for timing synchronization during a wireless uplink random access procedure
First Claim
1. A method of wireless communication by a user equipment (UE), comprising:
- receiving first timing advance information associated with uplink wireless communications with a base station (BS);
initiating a first timer associated with the first timing advance information to measure a valid time period for the first timing advance information;
transmitting a random access connection request message to the BS;
receiving a random access response from the BS while the first timing advance information is within the valid time period for the first timing advance information, the random access response comprising second timing advance information associated with uplink wireless communications with the BS;
transmitting a radio resource control (RRC) connection request to the BS after receiving the random access response;
receiving a contention resolution response from the BS responsive to the RRC connection request;
determining, after receiving the contention resolution response, that the valid time period for the first timing advance information has expired;
utilizing the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired;
initiating a second timer, different from the first timer, associated with the second timing advance information for a valid time period for the second timing advance information after determining that the valid time period for the first timing advance information has expired; and
adjusting an expiration of the second timer based on an elapsed time between the receipt of the random access response and the expiration of the valid time period for the first timing advance information.
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Accused Products
Abstract
Aspects generally relate to wireless communications and, more particularly, to methods, systems and apparatus for timing synchronization during a wireless uplink random access procedure. For example, certain aspects relate to a technique for receiving first timing advance information associated with uplink wireless communications with a base station (BS), transmitting a random access connection request message to the BS, receiving a random access response from the BS while the first timing advance information is within a valid time period, the random access response comprising second timing advance information associated with uplink wireless communications with the base station, determining, after receiving the random access response, that the valid time period for the first timing advance information has expired, and utilizing the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired. Numerous other aspects are provided.
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Citations
29 Claims
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1. A method of wireless communication by a user equipment (UE), comprising:
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receiving first timing advance information associated with uplink wireless communications with a base station (BS); initiating a first timer associated with the first timing advance information to measure a valid time period for the first timing advance information; transmitting a random access connection request message to the BS; receiving a random access response from the BS while the first timing advance information is within the valid time period for the first timing advance information, the random access response comprising second timing advance information associated with uplink wireless communications with the BS; transmitting a radio resource control (RRC) connection request to the BS after receiving the random access response; receiving a contention resolution response from the BS responsive to the RRC connection request; determining, after receiving the contention resolution response, that the valid time period for the first timing advance information has expired; utilizing the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired; initiating a second timer, different from the first timer, associated with the second timing advance information for a valid time period for the second timing advance information after determining that the valid time period for the first timing advance information has expired; and adjusting an expiration of the second timer based on an elapsed time between the receipt of the random access response and the expiration of the valid time period for the first timing advance information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for wireless communications, comprising:
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at least one processor configured to; receive first timing advance information associated with uplink wireless communications with a base station (BS); initiate a first timer associated with the first timing advance information to measure a valid time period for the first timing advance information; transmit a random access connection request message to the BS; receive a random access response from the BS while the first timing advance information is within the valid time period for the first timing advance information, the random access response comprising second timing advance information associated with uplink wireless communications with the BS; transmit a radio resource control (RRC) connection request to the BS after receiving the random access response; receive a contention resolution response from the BS responsive to the RRC connection request; determine, after receiving the contention resolution response, that the valid time period for the first timing advance information has expired; utilize the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired; initiate a second timer, different from the first timer, associated with the second timing advance information for a valid time period for the second timing advance information after determining that the valid time period for the first timing advance information has expired; and adjust an expiration of the second timer based on an elapsed time between the receipt of the random access response and the expiration of the valid time period for the first timing advance information; and a memory coupled to the at least one processor. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus for wireless communications, comprising:
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means for receiving first timing advance information associated with uplink wireless communications with a base station (BS); means for initiating a first timer associated with the first timing advance information to measure a valid time period for the first timing advance information; means for transmitting a random access connection request message to the BS; means for receiving a random access response from the BS while the first timing advance information is within the valid time period for the first timing advance information, the random access response comprising second timing advance information associated with uplink wireless communications with the BS; means for transmitting a radio resource control (RRC) connection request to the BS after receiving the random access response; means for receiving a contention resolution response from the BS responsive to the RRC connection request; means for determining, after receiving the contention resolution response, that the valid time period for the first timing advance information has expired; means for utilizing the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired; means for initiating a second timer, different from the first timer, associated with the second timing advance information for a valid time period for the second timing advance information after determining that the valid time period for the first timing advance information has expired; and means for adjusting an expiration of the second timer based on an elapsed time between the receipt of the random access response and the expiration of the valid time period for the first timing advance information. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A non-transitory computer-readable medium encoded with one or more instructions, the one or more instructions executable by one or more processors for:
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receiving first timing advance information associated with uplink wireless communications with a base station (BS); initiating a first timer associated with the first timing advance information to measure a valid time period for the first timing advance information; transmitting a random access connection request message to the BS; receiving a random access response from the BS while the first timing advance information is within the valid time period for the first timing advance information, the random access response comprising second timing advance information associated with uplink wireless communications with the BS; transmitting a radio resource control (RRC) connection request to the BS after receiving the random access response; receiving a contention resolution response from the BS responsive to the RRC connection request; determining, after receiving the contention resolution response, that the valid time period for the first timing advance information has expired; utilizing the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired; initiating a second timer, different from the first timer, associated with the second timing advance information for a valid time period for the second timing advance information after determining that the valid time period for the first timing advance information has expired; and adjusting an expiration of the second timer based on an elapsed time between the receipt of the random access response and the expiration of the valid time period for the first timing advance information. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A user equipment (UE), comprising:
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a receiver configured to receive first timing advance information associated with uplink wireless communications with a base station (BS); a transmitter configured to; transmit a random access connection request message to the BS, wherein the receiver is further configured to receive a random access response from the BS while the first timing advance information associated with uplink wireless communications with the BS is within a valid time period for the first timing advance information, the random access response comprising second timing advance information associated with uplink wireless communications with the BS; and transmit a radio resource control (RRC) connection request to the BS after the receiver receives the random access response, wherein the receiver is further configured to receive a contention resolution response from the BS responsive to the RRC connection request; and at least one processor configured to; initiate a first timer associated with the first timing advance information to measure the valid time period for the first timing advance information; determine, after the receiver receives the contention resolution response, that the valid time period for the first timing advance information has expired; utilize the second timing advance information for uplink communications with the BS after determining that the valid time period for the first timing advance information has expired; initiate a second timer, different from the first timer, associated with the second timing advance information for a valid time period for the second timing advance information after determining that the valid time period for the first timing advance information has expired; and adjust an expiration of the second timer based on an elapsed time between the receipt of the random access response and the expiration of the valid time period for the first timing advance information.
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Specification