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US 11,700,646 B2Granted
Method and terminal for counting preamble retransmission in random access procedure
AssigneeVivo Mobile Communication Co., Ltd.
InventorLi Chen
Life of this patent
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Abstract
The present disclosure provide a method and terminal for counting preamble retransmission in a random access procedure. The method includes: in a random access procedure, when detecting that no Random Access Response (RAR) is received or contention resolution fails, counting a number of times of retransmission of a preamble and/or a number of times of power ramping of transmission of the preamble according to a configured counter/counters.
Claims20
A terminal, comprising:
- a storage, processor and computer programs which are stored in the storage and run on the processor;
- wherein the computer programs are executed by the processor to implement:
- in a random access procedure, when detecting that no Random Access Response (RAR) is received or contention resolution fails, counting a number of times of retransmission of a preamble and/or a number of times of power ramping of transmission of the preamble according to a configured counter/counters;
- wherein the configured counter/counters comprises the counter of one type;
- and the computer programs are executed by the processor to implement:
- when the RAR message is not correctly received or the contention resolution fails, adding 1 to the counter;
- or
- when the RAR message is not correctly received or the contention resolution fails and a power ramping suspension instruction which is used to instruct a Medium Access Control (MAC) layer by a physical layer is not received, adding 1 to the counter;
- wherein the counter/counters comprises a power ramping counter;
- and the computer programs are executed by the processor to implement:
- when any of not correctly receiving the RAR message in preset time, contention resolution failure and retransmission of the preamble occurs and two adjacent transmissions of the preamble use a same beam, adding 1 to the power ramping counter;
- or
- when any of not correctly receiving the RAR message in the preset time, contention resolution failure and retransmission of the preamble occurs, two adjacent transmissions of the preamble use the same beam and the power ramping suspension instruction which is used to instruct the MAC layer by the physical layer is not received, adding 1 to the power ramping counter;
- wherein the counter/counters comprises:
- a preamble transmission counter.
12 more elements
A terminal, comprising:
- a storage, processor and computer programs which are stored in the storage and run on the processor;
- wherein the computer programs are executed by the processor to implement:
- in a random access procedure, when detecting that no Random Access Response (RAR) is received or contention resolution fails, counting a number of times of retransmission of a preamble and/or a number of times of power ramping of transmission of the preamble according to a configured counter/counters;
- wherein the configured counter/counters comprise:
- at least two types of counters;
- the computer programs are executed by the processor to implement:
- when the counters reach a maximum number of times, notifying an upper layer of a random access problem or failure of the random access procedure via the MAC layer;
- wherein the at least two types of counters comprise:
- a preamble transmission counter and a power ramping counter;
- wherein the computer programs are executed by the processor to implement:
- when any of not correctly receiving the RAR message in preset time, contention resolution failure and retransmission of the preamble occurs and two adjacent transmissions of the preamble use a same beam, adding 1 to the power ramping counter;
- or
- when any of not correctly receiving the RAR message in the preset time, contention resolution failure and retransmission of the preamble occurs, two adjacent transmissions of the preamble use the same beam and the power ramping suspension instruction which is used to instruct the MAC layer by the physical layer is not received, adding 1 to the power ramping counter.
10 more elements
A terminal, comprising:
- a storage, processor and computer programs which are stored in the storage and run on the processor;
- wherein the computer programs are executed by the processor to implement:
- in a random access procedure, when detecting that no Random Access Response (RAR) is received or contention resolution fails, counting a number of times of retransmission of a preamble and/or a number of times of power ramping of transmission of the preamble according to a configured counter/counters;
- wherein the configured counter/counters comprise:
- at least two types of counters;
- and the computer programs are executed by the processor to implement:
- when the counters reach a maximum number of times, notifying an upper layer of a random access problem or failure of the random access procedure via the MAC layer;
- wherein the at least two types of counters comprise:
- a preamble transmission counter and a power ramping counter;
- and the computer programs are executed by the processor to implement:
- obtaining a transmission power of retransmission after ramping according to a formula PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower+DELTA_P REAMBLE+(POWER_RAMPING_COUNTER−1)*powerRampingStep;
- wherein PREAMBLE_RECEIVED_TARGET_POWER denotes a target power value, preambleInitialReceivedTargetPower denotes an original power value, DELTA_PREAMBLE denotes a preset fixed value, POWER_RAMPING_COUNTER denotes a value of the current power ramping counter and powerRampingStep denotes a power ramping step size;
- the power ramping step size is configured by a base station for a terminal or determined by a preset rule.
10 more elements
Dependencies are inferred from the claim text.