CN109151980B - Method and terminal for controlling preamble sending power in random access process - Google Patents
Method and terminal for controlling preamble sending power in random access process Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The invention provides a method and a terminal for controlling preamble sending power in a random access process, and relates to the technical field of communication. The method for controlling the preamble transmission power in the random access process comprises the following steps: detecting the transmitting power of a lead code sent by a terminal; and when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, indicating a power climbing suspension instruction to a Medium Access Control (MAC) layer of the terminal and/or judging whether the random access has a problem or fails according to a set counter. According to the scheme, the specific communication behavior of the terminal is defined after the retransmission power of the preamble reaches the maximum value, so that the completeness of a communication flow is guaranteed, and the reliability of communication is guaranteed.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a terminal for controlling preamble transmission power in a random access procedure.
Background
Rach (random Access channel), which is a random Access channel, is an uplink transport channel. The RACH is received throughout the cell and is commonly used for PAGING answers and MS calling/logging accesses, etc.
The random access triggering conditions include: 1. initial access at RRC _ IDLE; 2. initially accessing when a wireless link is disconnected; 3. random access is needed during switching; 4. when a random access process is required in an RRC _ CONNECTED state, downlink data is received, and if an uplink synchronous state is 'asynchronous'; 5. when a random access process is required in the RRC _ CONNECTED state, uplink data is received, for example, when the uplink synchronization state is "asynchronous" or there is no PUCCH resource available for scheduling.
The Random Access (Random Access) procedure includes a Non-Contention (content-free/Non-Contention-based) and a Contention-based (content-based) Random Access procedure. Wherein the content of the first and second substances,
the non-contention random access procedure comprises two steps:
1. a terminal sends a random access preamble (also called message one (msg.1)) to a base station;
2. a terminal receives a Random Access Response (RAR) fed back by a base station, which is also called a message two (msg.2);
the contention-based random access procedure includes the steps of:
1. a terminal sends a random access preamble (also called message one (msg.1)) to a base station;
2. a terminal receives a Random Access Response (RAR) fed back by a base station, which is also called a message two (msg.2);
3. the terminal sends a competition resolving request, also called as message three (msg.3), to the base station;
4. the terminal receives the contention resolution result of the base station, which is also called message four (msg.4).
In the 5G NR system, in the current design of random access, power ramping (power ramping) is supported for each retransmission of the random access preamble.
In LTE (long term evolution) systems, PREAMBLE _ transition _ COUNTER, PREAMBLE retransmission COUNTER, is used to count the number of PREAMBLE retransmissions and for power ramping.
This counter is reset to 1 each time the random access procedure is initiated.
When msg.2, namely RAR is not correctly received and a power ramping suspension indication (power ramping suspension) sent by a bottom physical layer is not received, the counter is increased by 1;
when Contention Resolution fails (Contention Resolution Fail) and no power ramping suspension indication is received (power ramping suspension) from the underlying physical layer, the counter is incremented by 1.
In the above process, if the counter reaches the preamble (preamble) maximum transmission number +1, the MAC layer indicates an upper layer random access problem.
And (3) calculating the power of Preamble every time according to the counter and the step length of power climbing according to the following formula:
PREAMBLE_RECEIVED_TARGET_POWER＝preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER–1)*powerRampingStep；
wherein, PREAMBLE _ receiveved _ TARGET _ POWER represents a TARGET POWER value, PREAMBLE _ receivedtargetpower represents an original POWER value, DELTA _ PREAMBLE represents a preset fixed value, PREAMBLE _ transition _ COUNTER represents a value of a current PREAMBLE retransmission COUNTER, and powerRampingStep represents a POWER ramping step.
In LTE, the same counter is used for both the power ramp-up count and the number of preamble transmissions, i.e., the preamble retransmission counter is used for both the power ramp-up count and the preamble retransmission count. And indicating the random access problem or the random access failure of the upper layer when the preamble retransmission counter reaches the maximum number.
Since the current conclusions are: the count for power ramping remains unchanged if the terminal performs beam switching; the count for the power ramp up may be incremented if the terminal does not change beams at each retransmission.
It is possible that the terminal reaches the maximum transmit power when the preamble retransmission counter has not reached the maximum number of times, at which point the behavior of the terminal needs to be specified.
Disclosure of Invention
The embodiment of the invention provides a method and a terminal for controlling preamble transmission power in a random access process, which aim to solve the problems that the behavior of the terminal is defined after the preamble retransmission power reaches the maximum value in the conventional NR system, so that the communication flow is incomplete and the communication reliability cannot be ensured.
In order to solve the above technical problem, an embodiment of the present invention provides a method for controlling preamble transmission power in a random access process, including:
detecting the transmitting power of a lead code sent by a terminal;
and when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, indicating a power climbing suspension instruction to a Medium Access Control (MAC) layer of the terminal and/or judging whether the random access has a problem or fails according to a set counter.
An embodiment of the present invention further provides a terminal, including:
the detection module is used for detecting the transmitting power of the lead code sent by the terminal;
and the processing module is used for indicating a power climbing suspension instruction to a Medium Access Control (MAC) layer of the terminal and/or judging whether the random access has a problem or fails according to a set counter after the transmitting power of the lead code transmitted by the terminal is equal to the maximum transmitting power.
An embodiment of the present invention further provides a terminal, including: memory, processor and computer program stored on the memory and executable on the processor, the computer program being executed by the processor for the steps of the above method for controlling random access procedure preamble transmit power.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the method for controlling preamble transmission power in a random access procedure.
The invention has the beneficial effects that:
according to the scheme, the specific communication behavior of the terminal is defined after the retransmission power of the preamble reaches the maximum value, so that the completeness of a communication flow is guaranteed, and the reliability of communication is guaranteed.
Drawings
Fig. 1 is a flowchart illustrating a method for controlling preamble transmission power in a random access procedure according to an embodiment of the present invention;
fig. 2 shows a block diagram of a terminal according to an embodiment of the present invention;
fig. 3 shows a block diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides a method and a terminal for controlling preamble sending power in a random access process, aiming at the problems that the communication flow is incomplete and the communication reliability cannot be ensured because the behavior of the terminal is defined after the preamble retransmission power does not reach the maximum value in the conventional NR system.
As shown in fig. 1, a method for controlling preamble transmission power in a random access procedure according to an embodiment of the present invention includes:
it should be noted that, in this embodiment, the preamble (preamble) retransmission power is mainly monitored, and after the power reaches the maximum value, corresponding processing is performed, so that detection of the preamble transmission power is first required.
And step 102, when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, indicating a power climbing suspension instruction to a Medium Access Control (MAC) layer of the terminal and/or judging whether the random access has a problem or fails according to a set counter.
It should be noted that, when the transmission power reaches the maximum transmission power or when other physical layer triggering conditions are met, such as a random access procedure is temporarily stopped (Drop) (this scenario may occur when random access conflicts), the terminal may give a power ramping suspension indication (power ramping suspension), and the physical layer indicates the MAC layer, after the MAC layer of the terminal receives the power ramping suspension indication given by the physical layer, the MAC layer fails to perform random access within a preset time or a preset number of retransmission times of the preamble, and then the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure (random access failure), that is, after the transmission power reaches the maximum transmission power, the terminal still fails to perform random access, which indicates that the random access has a problem, and the MAC layer reports this situation to the upper layer, where the upper layer refers to a radio link layer (RLC layer) located above the physical layer, RRC layer (Radio Resource Control layer), network layer, application layer, and the like.
Specifically, the method for determining whether the random access has a problem according to the set counter includes:
after the transmission POWER of the preamble sent by the terminal is equal to the maximum transmission POWER, a POWER ramp COUNTER (POWER _ RAMPING _ COUNTER) set in the terminal suspends counting when the subsequent preamble is retransmitted.
That is, when the transmission power reaches the maximum transmission power, the power ramp-up counter is not subsequently operated to add 1, and when a random access response (RAR, i.e., message two (msg.2) in the random access) is not received or Contention Resolution failure (Contention Resolution Fail) is not received, the power ramp-up counter is not operated to add 1.
It should be noted that, when the terminal always retransmits the PREAMBLE according to the maximum TRANSMISSION power and determines whether to switch the BEAM, such a terminal may use the PREAMBLE TRANSMISSION COUNTER (PREAMBLE _ TRANSMISSION _ COUNTER) to count the PREAMBLE retransmission for the terminal and use the BEAM PREAMBLE retransmission COUNTER (PREAMBLE _ TRANSMISSION _ COUNTER) to count the PREAMBLE retransmission for the BEAM, at this time, if the PREAMBLE retransmission COUNTER set in the terminal reaches the first preset maximum TRANSMISSION times Max1 or Max1+1, or the count of at least one BEAM PREAMBLE retransmission COUNTER set in the terminal (i.e., the count of the PREAMBLE retransmission COUNTERs corresponding to all BEAMs or the count of the BEAM retransmission COUNTERs corresponding to several BEAMs) reaches the second preset maximum TRANSMISSION times Max2 or Max2+1, respectively, or the sum of the counts of at least one BEAM PREAMBLE retransmission COUNTER set in the terminal reaches the third preset maximum TRANSMISSION times 3 or the sum of the counts of at least one BEAM retransmission COUNTER reaches the third preset maximum TRANSMISSION times 3 or 2 respectively Max3+1, the MAC layer indicates an upper layer random access problem or indicates that the random access procedure failed.
If the terminal reaches the maximum transmitting power, beam switching is carried out, namely, another beam is adopted to carry out the retransmission of the lead code; and the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure when one of the following conditions exists:
1. carrying out beam switching during each lead code retransmission, and when all the beams are rotated, indicating the random access problem of the upper layer or indicating the failure of the random access process by the MAC layer;
2. after the count of a BEAM switching PREAMBLE retransmission COUNTER (PREAMBLE _ BEAM _ SWITCH _ COUNTER) arranged in the terminal reaches a fourth preset maximum transmission frequency, the MAC layer indicates an upper layer random access problem or indicates that a random access process fails;
3. at least one wave beam lead code retransmission counter arranged in the terminal counts to reach a fifth preset maximum sending time Max5 or Max5+1 respectively, and the MAC layer indicates the upper layer random access problem or indicates the failure of the random access process;
4. the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches the sixth preset maximum number of transmission times Max6 or Max6+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
Alternatively, in another possible case, after the maximum transmission power is reached, no matter whether the terminal performs the beam switching, as long as the terminal does not successfully perform the random access within the preset retransmission times or within the preset time, the MAC layer indicates an upper layer random access problem or indicates that the random access process fails.
Optionally, in another possible case, after the terminal reaches the maximum transmission power, the terminal updates part or all of the candidate beams; or the terminal performs beam switching. In this case, a first mode may be further adopted, in which a power ramp counter provided in the terminal is reset to an initial value, and preamble retransmission power ramping is performed again, that is, after the replacement wave is repeated, power ramping and re-counting of the power ramp counter are performed again; in this case, the following second mode may be further adopted, in which the power ramp-up counter set in the terminal is reset to the count value of the beam-preamble retransmission counter of the target beam set in the terminal, and preamble retransmission power ramping is performed again.
Alternatively, when a power level PREAMBLE TRANSMISSION COUNTER (PREAMBLE _ TRANSMISSION _ COUNTER _ PL) is provided in the terminal, the power level PREAMBLE TRANSMISSION COUNTER counts PREAMBLE TRANSMISSION at each power level. When the transmission power of the lead code sent by the terminal is the maximum transmission power, and the lead code transmission counter of the power level corresponding to the maximum transmission power reaches a preset maximum count value Max7 or Max7+1, the MAC layer indicates the problem of upper layer random access or indicates the failure of the random access process. Optionally, when the power level preamble transmission counter set in the terminal corresponds to a maximum transmission power, when the power level preamble transmission counter reaches a preset maximum count number, performing ramp-up of the transmission power of the preamble; and when the transmit power of the preamble is ramped up, the power level preamble transmission counter set in the terminal needs to be reset.
Optionally, the transmission power of the preamble may also be backed off, and when the transmission power of the preamble is backed off, the preamble transmission counter of the power level set in the terminal also needs to be reset.
The setting rule of the power level preamble transmission counter is as follows:
resetting the power class preamble transmission counter to 1 or 0 each time a random access procedure is initialized or reset;
when the terminal does not correctly receive the RAR message within a preset time (the preset time is an RAR window, that is, an RAR time window) or the contention resolution fails, the power level preamble transmission counter performs an operation of adding 1 to the count.
It should be noted that, when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, the terminal may further perform the following measures:
backing off the current transmission power by one step of power, and retransmitting the lead code according to the backed-off transmission power; or
Backing off the current transmitting power by one step of power, switching beams, and retransmitting a lead code based on the switched beams and the backed-off transmitting power;
it should be noted that, the step size of the transmission power backoff is configured by the base station for the terminal (the base station configures the terminal by means of a dedicated Radio Resource Control (RRC) message, an RRC configuration, an RRC reconfiguration, a system message (SI), a broadcast message, or the like), or the step size of the transmission power backoff is determined by a preset rule (i.e., the step size is agreed by a protocol).
Further, after the transmission power is backed off, the terminal may also resume the power ramp of the preamble retransmission.
According to the embodiment of the invention, the specific communication behavior of the terminal is defined after the retransmission power of the preamble reaches the maximum value, so that the completeness of a communication flow is ensured; meanwhile, the processing mode of the embodiment of the invention can reduce the interference of the terminal to other terminals with the same frequency, and ensure the reliability of communication as much as possible.
As shown in fig. 2, the terminal according to the embodiment of the present invention includes:
a detecting module 201, configured to detect a transmission power of a preamble sent by a terminal;
a processing module 202, configured to, after the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, indicate a power ramp-up/pause indication to a medium access control MAC layer of the terminal and/or determine whether there is a problem in random access or whether random access fails according to a set counter.
Further, after receiving a power climbing suspension instruction given by the physical layer, the MAC layer of the terminal does not perform random access within a preset time or a preset number of retransmission times of the preamble, and then the MAC layer indicates an upper layer random access problem or indicates that the random access process fails.
Optionally, the determining, by the processing module, whether the random access has a problem or fails according to the set counter includes:
upon subsequent preamble retransmissions, a power ramp-up counter set in the terminal suspends counting.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is configured to:
if the preamble retransmission counter set in the terminal reaches a first preset maximum number of transmissions Max1 or Max1+1, or the count of at least one beam preamble retransmission counter set in the terminal reaches a second preset maximum number of transmissions Max2 or Max2+1, respectively, or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches a third preset maximum number of transmissions Max3 or Max3+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is configured to:
carrying out beam switching; and is
The wave beam switching is carried out on the lead code retransmission every time, and when all the wave beams are alternated, the MAC layer indicates the random access problem of the upper layer or indicates the failure of the random access process; or after the count of a beam switching lead code retransmission counter arranged in the terminal reaches a fourth preset maximum sending time, the MAC layer indicates the upper layer random access problem or indicates the random access process to fail; or at least one beam lead code retransmission counter arranged in the terminal counts to reach a fifth preset maximum sending time Max5 or Max5+1 respectively, and the MAC layer indicates the upper layer random access problem or indicates the failure of the random access process; or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches the sixth preset maximum number of transmissions Max6 or Max6+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is configured to:
the terminal updates part or all candidate beams; or
Beam switching is performed.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is further configured to:
resetting a power ramp counter set in the terminal as an initial value, and performing preamble retransmission power ramp again.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is further configured to:
resetting a power ramp counter set in the terminal to be the counting value of a beam lead code retransmission counter of a target beam set in the terminal, and re-performing lead code retransmission power ramp.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is configured to:
when the transmission power of the lead code sent by the terminal is the maximum transmission power, the lead code transmission counter of the power level corresponding to the maximum transmission power reaches a preset maximum count value Max7 or Max7+1, and the MAC layer indicates the problem of upper layer random access or indicates the failure of the random access process.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is configured to:
when a power level lead code transmission counter arranged in the terminal reaches a preset maximum counting number, climbing of the transmitting power of the lead code is carried out; or
And resetting a power level lead code transmission counter set in the terminal when the transmission power of the lead code is backed off.
Optionally, when determining whether the random access has a problem or fails according to the set counter, the processing module is further configured to:
and resetting a power level lead code transmission counter set in the terminal when the transmitting power of the lead code climbs.
Further, when the terminal does not correctly receive the random access response RAR message within a preset time or the contention resolution fails, the power level preamble transmission counter performs an operation of adding 1 to the count.
Further, when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, the method further includes:
and the indication module is used for indicating the upper layer random access problem or indicating the failure of the random access process by the MAC layer if the random access is not successful within the preset time or the preset retransmission times of the lead code.
Further, when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, the method further includes:
a power back-off module, configured to back off the current transmission power by a step size, and perform retransmission of the preamble according to the back-off transmission power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
Further, when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, the method further includes:
the switching module is used for backing the current transmitting power by one step of power, switching beams and retransmitting the lead codes based on the switched beams and the backed-back transmitting power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
Further, the terminal further includes:
a power ramping module to ramp power for re-preamble retransmission.
It should be noted that the terminal embodiment is a terminal corresponding to the above method for controlling preamble transmission power in a random access procedure applied to the terminal side, and all implementations of the above embodiments are applicable to the terminal embodiment, and can achieve the same technical effects.
An embodiment of the present invention further provides a terminal, including: the random access procedure preamble transmission power control method applied to the terminal side can achieve the same technical effect, and is not described herein again to avoid repetition.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements each process in the above control method for preamble transmission power in a random access procedure applied to a terminal side, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Fig. 3 is a block diagram of a terminal according to an embodiment of the present invention. The application entity of the method for controlling the preamble transmission power in the random access procedure of the present invention is specifically described below with reference to the figure.
The terminal 300 shown in fig. 3 includes: at least one processor 301, memory 302, at least one network interface 304, and a user interface 303. The various components in terminal 300 are coupled together by a bus system 305. It will be appreciated that the bus system 305 is used to enable communications among the components connected. The bus system 305 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 305 in fig. 3.
The user interface 303 may include, among other things, a display, a keyboard, or a pointing device (e.g., a mouse, track ball, touch pad, or touch screen, etc.).
It will be appreciated that the memory 302 in embodiments of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (ddr Data Rate SDRAM, ddr SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 302 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
In some embodiments, memory 302 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 3021 and application programs 3022.
The operating system 3021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application programs 3022 include various application programs, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. A program implementing the method of an embodiment of the present invention may be included in the application program 3022.
In the embodiment of the present invention, the mobile terminal 300 further includes: a computer program stored on the memory 302 and executable on the processor 301, in particular a computer control program in an application 3022, which computer program, when executed by the processor 301, performs the steps of: detecting the transmitting power of a lead code sent by a terminal; and when the transmission power of the preamble sent by the terminal is equal to the maximum transmission power, indicating a power climbing suspension instruction to a Medium Access Control (MAC) layer of the terminal and/or judging whether the random access has a problem or fails according to a set counter.
The method disclosed in the above embodiments of the present invention may be applied to the processor 301, or implemented by the processor 301. The processor 301 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 301. The Processor 301 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may reside in ram, flash memory, rom, prom, or eprom, registers, among other computer-readable storage media known in the art. The computer readable storage medium is located in the memory 302, and the processor 301 reads the information in the memory 302 and performs the steps of the above method in combination with the hardware thereof. In particular, the computer readable storage medium has stored thereon a computer program which, when executed by the processor 301, performs the steps described below.
It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.
For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.
Optionally, the computer program when executed by the processor 301 implements: after receiving a power climbing suspension instruction given by a physical layer, an MAC layer of the terminal does not perform random access successfully within preset time or preset retransmission times of a lead code, and then the MAC layer indicates an upper layer random access problem or indicates that a random access process fails.
Optionally, the computer program when executed by the processor 301 implements: upon subsequent preamble retransmissions, a power ramp-up counter set in the terminal suspends counting.
Optionally, the computer program when executed by the processor 301 implements: if the preamble retransmission counter set in the terminal reaches a first preset maximum number of transmissions Max1 or Max1+1, or the count of at least one beam preamble retransmission counter set in the terminal reaches a second preset maximum number of transmissions Max2 or Max2+1, respectively, or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches a third preset maximum number of transmissions Max3 or Max3+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
Optionally, the computer program when executed by the processor 301 implements: carrying out beam switching; and is
The wave beam switching is carried out on the lead code retransmission every time, and when all the wave beams are alternated, the MAC layer indicates the random access problem of the upper layer or indicates the failure of the random access process; or after the count of a beam switching lead code retransmission counter arranged in the terminal reaches a fourth preset maximum sending time, the MAC layer indicates the upper layer random access problem or indicates the random access process to fail; or at least one beam lead code retransmission counter arranged in the terminal counts to reach a fifth preset maximum sending time Max5 or Max5+1 respectively, and the MAC layer indicates the upper layer random access problem or indicates the failure of the random access process; or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches the sixth preset maximum number of transmissions Max6 or Max6+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
Optionally, the computer program when executed by the processor 301 implements: the terminal updates part or all candidate beams; or
Beam switching is performed.
Optionally, the computer program when executed by the processor 301 implements: resetting a power ramp counter set in the terminal as an initial value, and performing preamble retransmission power ramp again.
Optionally, the computer program when executed by the processor 301 implements: resetting a power ramp counter set in the terminal to be the counting value of a beam lead code retransmission counter of a target beam set in the terminal, and re-performing lead code retransmission power ramp.
Optionally, the computer program when executed by the processor 301 implements: when the transmission power of the lead code sent by the terminal is the maximum transmission power, the lead code transmission counter of the power level corresponding to the maximum transmission power reaches a preset maximum count value Max7 or Max7+1, and the MAC layer indicates the problem of upper layer random access or indicates the failure of the random access process.
Optionally, the computer program when executed by the processor 301 implements: when a power level lead code transmission counter arranged in the terminal reaches a preset maximum counting number, climbing of the transmitting power of the lead code is carried out; or
And resetting a power level lead code transmission counter set in the terminal when the transmission power of the lead code is backed off.
Optionally, the computer program when executed by the processor 301 implements: and resetting a power level lead code transmission counter set in the terminal when the transmitting power of the lead code climbs.
Optionally, the computer program when executed by the processor 301 implements: and when the terminal does not correctly receive the Random Access Response (RAR) message within the preset time or the contention resolution fails, the power level lead code transmission counter carries out the operation of counting and adding 1.
Optionally, the computer program when executed by the processor 301 implements: if the random access is not successful within the preset time or the preset retransmission times of the lead code, the MAC layer indicates the problem of the random access of the upper layer or indicates the failure of the random access process.
Optionally, the computer program when executed by the processor 301 implements: backing off the current transmission power by one step of power, and retransmitting the lead code according to the backed-off transmission power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
Optionally, the computer program when executed by the processor 301 implements: backing off the current transmitting power by one step of power, switching beams, and retransmitting a lead code based on the switched beams and the backed-off transmitting power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
The terminal 300 can implement the processes implemented by the terminal in the foregoing embodiments, and in order to avoid repetition, the description is omitted here.
The terminal of the embodiment of the invention defines the specific communication behavior of the terminal after the retransmission power of the preamble reaches the maximum value, thereby ensuring the integrity of the communication flow and the reliability of the communication.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (32)
1. A method for controlling preamble transmission power in a random access procedure, comprising:
detecting the transmitting power of a lead code sent by a terminal;
when the transmitting power of the lead code sent by the terminal is equal to the maximum transmitting power, indicating a power climbing suspension instruction to a Medium Access Control (MAC) layer of the terminal and/or judging whether random access has a problem or fails according to a set counter;
wherein, the mode of judging whether the random access has problems or whether the random access fails according to the set counter comprises:
carrying out beam switching; and is
The wave beam switching is carried out on the lead code retransmission every time, and when all the wave beams are alternated, the MAC layer indicates the random access problem of the upper layer or indicates the failure of the random access process; or after the count of a beam switching lead code retransmission counter arranged in the terminal reaches a fourth preset maximum sending time, the MAC layer indicates the upper layer random access problem or indicates the random access process to fail; or at least one beam lead code retransmission counter arranged in the terminal counts to reach a fifth preset maximum sending time Max5 or Max5+1 respectively, and the MAC layer indicates the upper layer random access problem or indicates the failure of the random access process; or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches the sixth preset maximum number of transmissions Max6 or Max6+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
2. The method for controlling preamble transmission power in a random access procedure according to claim 1, wherein the MAC layer of the terminal, after receiving the power ramp-up suspension indication from the physical layer, does not perform the random access within a preset time or a preset number of retransmission times of the preamble, and indicates the upper layer random access problem or indicates the random access procedure failure.
3. The method for controlling preamble transmission power in random access procedure according to claim 1, wherein the determining whether the random access has a problem or fails according to the set counter comprises:
upon subsequent preamble retransmissions, a ramp-up counter set in the terminal suspends the power count.
4. The method for controlling preamble transmission power in random access procedure according to claim 1, wherein the determining whether the random access has a problem or fails according to the set counter comprises:
if the preamble retransmission counter set in the terminal reaches a first preset maximum number of transmissions Max1 or Max1+1, or the count of at least one beam preamble retransmission counter set in the terminal reaches a second preset maximum number of transmissions Max2 or Max2+1, respectively, or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches a third preset maximum number of transmissions Max3 or Max3+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
5. The method for controlling preamble transmission power in random access procedure according to claim 1, wherein the determining whether the random access has a problem or fails according to the set counter comprises:
the terminal updates part or all candidate beams; or
Beam switching is performed.
6. The method for controlling preamble transmission power in random access procedure according to claim 5, wherein the method for determining whether there is a problem with random access or whether random access fails according to the set counter further comprises:
resetting a power ramp counter set in the terminal as an initial value, and performing preamble retransmission power ramp again.
7. The method for controlling preamble transmission power in random access procedure according to claim 5, wherein the determining whether the random access has a problem or fails according to the set counter comprises:
resetting a power ramp counter set in the terminal to be the counting value of a beam lead code retransmission counter of a target beam set in the terminal, and re-performing lead code retransmission power ramp.
8. The method for controlling preamble transmission power in random access procedure according to claim 1, wherein the determining whether the random access has a problem or fails according to the set counter comprises:
when the transmission power of the lead code sent by the terminal is the maximum transmission power, the lead code transmission counter of the power level corresponding to the maximum transmission power reaches a preset maximum count value Max7 or Max7+1, and the MAC layer indicates the problem of upper layer random access or indicates the failure of the random access process.
9. The method for controlling preamble transmission power in a random access procedure according to claim 8, wherein the step of determining whether the random access has a problem or fails according to the set counter comprises:
when a power level lead code transmission counter arranged in the terminal reaches a preset maximum counting number, climbing of the transmitting power of the lead code is carried out; or
And resetting a power level lead code transmission counter set in the terminal when the transmission power of the lead code is backed off.
10. The method for controlling preamble transmission power in a random access procedure according to claim 8, wherein the method for determining whether there is a problem with the random access or whether the random access fails according to the set counter further comprises:
and resetting a power level lead code transmission counter set in the terminal when the transmitting power of the lead code climbs.
11. The method for controlling random access procedure preamble transmission power according to claim 8, wherein the power level preamble transmission counter performs the operation of adding 1 to the count when the terminal does not correctly receive the random access response RAR message within a preset time or the contention resolution fails.
12. The method for controlling preamble transmission power in random access procedure according to claim 1, wherein when the transmission power of the preamble transmitted by the terminal is equal to the maximum transmission power, the method further comprises:
if the random access is not successful within the preset time or the preset retransmission times of the lead code, the MAC layer indicates the problem of the random access of the upper layer or indicates the failure of the random access process.
13. The method for controlling preamble transmission power in random access procedure according to claim 1, wherein when the transmission power of the preamble transmitted by the terminal is equal to the maximum transmission power, the method further comprises:
backing off the current transmission power by one step of power, and retransmitting the lead code according to the backed-off transmission power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
14. The method for controlling preamble transmission power in random access procedure according to claim 1, wherein when the transmission power of the preamble transmitted by the terminal is equal to the maximum transmission power, the method further comprises:
backing off the current transmitting power by one step of power, switching beams, and retransmitting a lead code based on the switched beams and the backed-off transmitting power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
15. The method for controlling preamble transmission power in random access procedure according to claim 13 or 14, further comprising: the power ramp for re-preamble retransmission is performed.
16. A terminal, comprising:
the detection module is used for detecting the transmitting power of the lead code sent by the terminal;
the processing module is used for indicating a power climbing suspension instruction to a Medium Access Control (MAC) layer of the terminal and/or judging whether random access has a problem or fails according to a set counter after the transmitting power of the lead code transmitted by the terminal is equal to the maximum transmitting power;
wherein, the processing module is used for judging whether the random access has problems or fails according to the set counter:
carrying out beam switching; and is
The wave beam switching is carried out on the lead code retransmission every time, and when all the wave beams are alternated, the MAC layer indicates the random access problem of the upper layer or indicates the failure of the random access process; or after the count of a beam switching lead code retransmission counter arranged in the terminal reaches a fourth preset maximum sending time, the MAC layer indicates the upper layer random access problem or indicates the random access process to fail; or at least one beam lead code retransmission counter arranged in the terminal counts to reach a fifth preset maximum sending time Max5 or Max5+1 respectively, and the MAC layer indicates the upper layer random access problem or indicates the failure of the random access process; or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches the sixth preset maximum number of transmissions Max6 or Max6+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
17. The terminal of claim 16, wherein after receiving the power ramp-up suspension indication from the physical layer, if the MAC layer of the terminal fails to perform random access within a preset time or a preset number of retransmissions of the preamble, the MAC layer indicates an upper layer random access problem or indicates a failure of the random access procedure.
18. The terminal of claim 16, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is configured to:
upon subsequent preamble retransmissions, a power ramp-up counter set in the terminal suspends counting.
19. The terminal of claim 16, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is configured to:
if the preamble retransmission counter set in the terminal reaches a first preset maximum number of transmissions Max1 or Max1+1, or the count of at least one beam preamble retransmission counter set in the terminal reaches a second preset maximum number of transmissions Max2 or Max2+1, respectively, or the sum of the counts of at least one beam preamble retransmission counter set in the terminal reaches a third preset maximum number of transmissions Max3 or Max3+1, the MAC layer indicates an upper layer random access problem or indicates a random access procedure failure.
20. The terminal of claim 16, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is configured to:
updating part or all of the candidate beams; or
Beam switching is performed.
21. The terminal of claim 20, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is further configured to:
resetting a power ramp counter set in the terminal as an initial value, and performing preamble retransmission power ramp again.
22. The terminal of claim 20, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is further configured to:
resetting a power ramp counter set in the terminal to be the counting value of a beam lead code retransmission counter of a target beam set in the terminal, and re-performing lead code retransmission power ramp.
23. The terminal of claim 16, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is configured to:
when the transmission power of the lead code sent by the terminal is the maximum transmission power, the lead code transmission counter of the power level corresponding to the maximum transmission power reaches a preset maximum count value Max7 or Max7+1, and the MAC layer indicates the problem of upper layer random access or indicates the failure of the random access process.
24. The terminal of claim 23, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is further configured to:
when a power level lead code transmission counter arranged in the terminal reaches a preset maximum counting number, climbing of the transmitting power of the lead code is carried out; or
And resetting a power level lead code transmission counter set in the terminal when the transmission power of the lead code is backed off.
25. The terminal of claim 23, wherein the processing module, when determining whether there is a problem in random access or whether random access fails according to the set counter, is further configured to:
and resetting a power level lead code transmission counter set in the terminal when the transmitting power of the lead code climbs.
26. The terminal of claim 23, wherein the power class preamble transmission counter is incremented by 1 when the terminal does not correctly receive a Random Access Response (RAR) message within a preset time or when contention resolution fails.
27. The terminal of claim 16, wherein when the transmission power of the preamble transmitted by the terminal is equal to the maximum transmission power, the method further comprises:
and the indication module is used for indicating the upper layer random access problem or indicating the failure of the random access process by the MAC layer if the random access is not successful within the preset time or the preset retransmission times of the lead code.
28. The terminal of claim 16, wherein when the transmission power of the preamble transmitted by the terminal is equal to the maximum transmission power, the method further comprises:
a power back-off module, configured to back off the current transmission power by a step size, and perform retransmission of the preamble according to the back-off transmission power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
29. The terminal of claim 16, wherein when the transmission power of the preamble transmitted by the terminal is equal to the maximum transmission power, the method further comprises:
the switching module is used for backing the current transmitting power by one step of power, switching beams and retransmitting the lead codes based on the switched beams and the backed-back transmitting power;
and the step length is configured for the terminal by the base station or determined by a preset rule.
30. The terminal according to claim 28 or 29, further comprising:
a power ramping module to ramp power for re-preamble retransmission.
31. A terminal, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method for random access procedure preamble transmission power control according to any of claims 1 to 15.
32. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for random access procedure preamble transmission power control according to any of claims 1 to 15.
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| CN110933740B (en) * | 2019-11-26 | 2022-03-15 | RealMe重庆移动通信有限公司 | Uplink data transmission method and device, terminal equipment and storage medium |
| CN111412490B (en) * | 2020-04-03 | 2021-08-03 | 贵州弘邦电子科技有限公司 | Method for controlling ignition gun based on wireless terminal and intelligent ignition gun |
| CN113038484B (en) * | 2021-03-11 | 2022-08-26 | 河南大学 | Financial big data collection method and system based on 5G NR |
| CN116996979A (en) * | 2022-04-25 | 2023-11-03 | 华为技术有限公司 | Power control method, device and computer readable storage medium |
| CN117528822A (en) * | 2022-07-26 | 2024-02-06 | 上海朗帛通信技术有限公司 | Method and apparatus in a communication node for wireless communication |
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| US9609499B2 (en) * | 2013-05-22 | 2017-03-28 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Apparatus and method to prioritize a random access procedure for emergency access |
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