CN112153741A - Method, terminal and network equipment for triggering random access - Google Patents
Method, terminal and network equipment for triggering random access Download PDFInfo
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- CN112153741A CN112153741A CN201910580231.7A CN201910580231A CN112153741A CN 112153741 A CN112153741 A CN 112153741A CN 201910580231 A CN201910580231 A CN 201910580231A CN 112153741 A CN112153741 A CN 112153741A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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Abstract
A method, a terminal and a network device for triggering random access are provided, the method comprises: receiving downlink control information sent by a network; and when the random access flow triggered by the downlink control information is a 2-step random access flow, initiating random access according to the 2-step random access flow. According to the method, the terminal and the network device for triggering the random access, provided by the embodiment of the invention, the network device can trigger the terminal to initiate the 2-step random access process or the 4-step random access process, so that a scheme for triggering the 2-step random access process by the network device is realized, and the method, the terminal and the network device can be applied to operations such as terminal time synchronization adjustment or auxiliary cell addition and the like, and the processing delay of the operations is reduced.
Description
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a method, a terminal, and a network device for triggering random access.
Background
In the prior art, a procedure for a terminal to initiate a Contention-based Random Access (CBRA) is roughly as follows:
1) a terminal sends an uplink signal containing a Preamble sequence (Preamble) on a resource of a Physical Random Access Channel (PRACH), which is called Msg 1;
2) a terminal receives a Random Access Response (RAR) sent by a base station side, and the RAR is called Msg 2;
3) the terminal sends uplink data on the uplink time-frequency resource indicated by the RAR, and the uplink data is called Msg 3;
4) the terminal receives downlink data transmitted from the base station side, the downlink data including information related to contention resolution, which is called Msg 4.
The above procedure is referred to as a 4-step random access (4-step RACH) procedure.
In order to reduce the random access delay, the prior art also proposes to introduce a 2-step random access (2-step RACH procedure, as shown in fig. 1 in particular.
In the 2-step random access flow, the terminal concentrates the Msg1 and the Msg3 in the original 4-step random access flow into one step for sending, and the step is called Msg A; and combining the Msg2 and the Msg4 in the original 4-step random access flow into the Msg B.
Disclosure of Invention
At least one embodiment of the invention provides a method, a terminal and a network device for triggering random access, which realizes that a network device triggers a 2-step random access process.
According to an aspect of the present invention, at least one embodiment provides a method for triggering random access, including:
receiving downlink control information sent by a network;
and when the random access flow triggered by the downlink control information is a 2-step random access flow, initiating random access according to the 2-step random access flow.
According to at least one embodiment of the present invention, all of the frequency domain resource allocation fields of the downlink control information are 1.
According to at least one embodiment of the present invention, after receiving the downlink control information, the method further includes:
and determining that the random access flow triggered by the downlink control information is a 2-step random access flow or a 4-step random access flow according to at least one preset bit in the downlink control information.
According to at least one embodiment of the present invention, when the downlink control information indicates that the triggered random access procedure is a 2-step random access procedure, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information used for indicating whether a Physical Uplink Shared Channel (PUSCH) is subjected to frequency hopping;
a demodulation reference signal port.
According to at least one embodiment of the invention, the method further comprises:
and in the process of initiating random access according to the 2-step random access flow, transmitting pilot frequency and/or PUSCH according to the parameters.
According to another aspect of the present invention, there is also provided a method for triggering random access, applied to a network device, including:
sending downlink control information to a terminal, wherein the downlink control information is used for triggering a 2-step random access process;
responding to a 2-step random access flow initiated by the terminal according to the downlink control information, and establishing connection with the terminal.
According to at least one embodiment of the present invention, before the sending the downlink control information, the method further includes:
when the network equipment initiates target operation aiming at the terminal, the network equipment determines that the random access flow needing to be initiated is a 2-step random access flow or a 4-step random access flow according to whether the requirement of the target operation on operation delay is lower than a preset threshold.
According to at least one embodiment of the invention, the target operation comprises at least one of the following operations:
re-acquiring the time adjustment quantity of the terminal;
adding an auxiliary cell for the terminal;
and positioning the terminal.
According to at least one embodiment of the present invention, all frequency domain resource allocation domains of the downlink control information are set to 1.
According to at least one embodiment of the present invention, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure.
According to at least one embodiment of the present invention, when the random access procedure triggered by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether to frequency hop;
a demodulation reference signal port.
According to another aspect of the present invention, there is also provided a terminal, including:
a transceiver for receiving downlink control information transmitted by the network
And the processor is used for initiating random access according to the 2-step random access flow when the random access flow triggered by the downlink control information is the 2-step random access flow.
According to at least one embodiment of the present invention, all of the frequency domain resource allocation fields of the downlink control information are 1.
According to at least one embodiment of the present invention, the processor is further configured to determine, according to at least one preset bit in the downlink control information, that a random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure.
According to at least one embodiment of the present invention, when the downlink control information indicates that the triggered random access procedure is a 2-step random access procedure, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information used for indicating whether a Physical Uplink Shared Channel (PUSCH) is subjected to frequency hopping;
a demodulation reference signal port.
According to at least one embodiment of the present invention, the processor is further configured to transmit a pilot and/or a PUSCH according to the parameter in a process of initiating random access according to a 2-step random access procedure.
According to another aspect of the present invention, at least one embodiment provides a terminal including: memory, processor and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of triggering random access as described above.
According to another aspect of the present invention, at least one embodiment provides a network device, including:
the transceiver is used for sending downlink control information to the terminal, and the downlink control information is used for triggering a 2-step random access process;
and the processor is used for responding to a 2-step random access flow initiated by the terminal according to the downlink control information and establishing connection with the terminal.
According to at least one embodiment of the present invention, the processor is further configured to determine, when initiating a target operation for the terminal, whether a requirement of the target operation on an operation delay is lower than a preset threshold, that a random access procedure to be initiated is a 2-step random access procedure or a 4-step random access procedure.
According to at least one embodiment of the invention, the target operation comprises at least one of the following operations:
re-acquiring the time adjustment quantity of the terminal;
adding an auxiliary cell for the terminal;
and positioning the terminal.
According to at least one embodiment of the present invention, all frequency domain resource allocation domains of the downlink control information are set to 1.
According to at least one embodiment of the present invention, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure.
According to at least one embodiment of the present invention, when the random access procedure triggered by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether to frequency hop;
a demodulation reference signal port.
According to another aspect of the present invention, at least one embodiment provides a network device, including: memory, processor and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of triggering random access as described above.
According to another aspect of the invention, at least one embodiment provides a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of the method as described above.
Compared with the prior art, the method, the terminal and the network device for triggering the random access provided by the embodiment of the invention have the advantages that the network device can trigger the terminal to initiate the 2-step random access or the 4-step random access process, so that the scheme that the 2-step random access process is triggered by the network device is realized, and the method, the terminal and the network device can be applied to the operations of terminal time synchronization adjustment, auxiliary cell addition and the like, and the processing delay of the operations is reduced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a 2-step random access procedure in the prior art;
FIG. 2 is a schematic diagram of an application scenario according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for triggering random access according to an embodiment of the present invention;
fig. 4 is another flowchart of a method for triggering random access according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present invention;
fig. 8 is another schematic structural diagram of a network device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.
The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
One triggering method of 4-step random access in the prior art may be triggered by a physical Downlink Control channel command (PDCCH order), and when a terminal receives Downlink Control Information (DCI) format 1_0, and the terminal scrambles through a Cell-Radio Network Temporary identifier (C-RNTI) and all bit fields of frequency domain resource allocation are 1, the PDCCH order triggers a 4-step random access procedure. The remaining bit field of the DCI is used to indicate random access parameters (including reserved bits), which is specifically shown in table 1.
TABLE 1
In the above table, when the random access pilot index is all zero, the SS/PBCH index and the prachmark index are reserved fields.
The network device may trigger a 4-step random access procedure for terminal time synchronization adjustment or secondary cell addition, and the like. At present, the prior art does not support triggering a 2-step random access procedure by a network device, and therefore, an embodiment of the present invention provides a method for triggering random access, which implements triggering a 2-step random access procedure by a network device, and can reduce the processing delay of the above operations by using the advantage of low access delay in the 2-step access procedure.
Referring to fig. 2-3, fig. 2 is a block diagram of a wireless communication system to which an embodiment of the invention is applicable. The wireless communication system includes a terminal 21 and a network device 22. Referring to fig. 3, the method for triggering random access according to the embodiment of the present invention, when applied to a terminal, includes:
and step 31, receiving the downlink control information sent by the network.
Here, the format of the downlink control information may be DCI _1_ 0. Specifically, all frequency domain resource allocation domains of the downlink control information are 1 (a representation of PDCCH order). Optionally, the downlink control information includes at least one preset bit for indicating a triggered access procedure, where the access procedure may include 2-step random access and 4-step random access. The at least one preset bit carries flow indication information of a specific random access flow. In the step 31, the downlink control information sent by the network may be scrambled via the C-RNTI of the terminal.
According to at least one embodiment of the present invention, the at least one preset bit requires a minimum of 1 bit. Considering compatibility with the triggering 4-step random access procedure in the prior art, the embodiment of the present invention may use a reserved bit that is not used in the triggering 4-step random access procedure in the prior art, and indicate the triggered random access procedure (e.g., 2-step random access or 4-step random access procedure) through the reserved bit.
Taking the downlink control information shown in table 1 as an example, the embodiment of the present invention may indicate the triggered random access procedure through the last 10 bits (reserved bits) of the downlink control information, and specifically, may pre-agree on a certain bit among the last 10 bits, such as the first bit. Generally, the corresponding relationship between the values of the bits and the random access procedure may be agreed in advance. In addition, in order to be compatible with the scheme for triggering the 4-step random access procedure, the procedure indication information may indicate by using the following correspondence relationship: the value of 1 represents that the triggered random access process is 2 steps; the value of 0 indicates that the triggered random access flow is 4 steps. Referring to table 2, a specific example of the downlink control information for triggering the 2-step random access procedure that may be adopted in the embodiment of the present invention is given:
TABLE 2
And step 32, when the random access flow triggered by the downlink control information is a 2-step random access flow, initiating random access according to the 2-step random access flow.
Here, the terminal may determine, according to at least one preset bit in the downlink control information, that the random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure. During specific receiving, the terminal may descramble the downlink control information by using its own C-RNTI, and then parse the indication information of the access procedure from the downlink control information. Specifically, the random access procedure corresponding to the value may be determined according to the value of the bit where the access procedure indication information is located, and specifically may be a 2-step random access procedure or a 4-step random access procedure. For example, when the triggered random access flow is a 2-step random access flow, according to the flow shown in fig. 1, the terminal first sends MsgA to the network device, and then receives MsgB returned by the network device, thereby completing the 2-step random access flow. In addition, for saving space, details regarding the specific steps of the 4-step random access procedure will not be described herein.
Through the steps, the terminal of the embodiment of the invention can initiate the 2-step random access or 4-step random access process according to the triggering of the network equipment, thereby realizing the scheme that the 2-step random access process is triggered by the network equipment, being applied to the operations of terminal time synchronization adjustment or auxiliary cell addition and the like, and reducing the processing time delay of the operations.
According to at least one embodiment of the present invention, when the access procedure indicated by the indication information is 2-step random access, the downlink control information sent by the network device may further include at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter (numerology) indication information;
the waveform indication information is used for indicating a waveform used by the terminal for transmission;
modulation and Coding Scheme (MCS);
frequency hopping indication information for indicating whether the PUSCH is frequency hopped or not;
a Demodulation Reference Signal (DMRS) port;
and indications of other functions or parameters.
Here, the system parameter (numerology) may include various contents such as a subcarrier Interval, a Cyclic Prefix (CP) length, a Transmission Time Interval (TTI) length, and the like.
In this way, in step 33, during the process of initiating the 2-step random access, the terminal performs transmission of a pilot and/or a PUSCH according to the parameter, for example, performs PUSCH transmission according to a modulation and coding strategy indicated by the downlink control information.
The flow at the terminal side in the embodiment of the present invention is explained above. Referring to fig. 4, the method for triggering random access according to an embodiment of the present invention, when applied to a network device, includes:
and step 41, sending downlink control information to the terminal, wherein the downlink control information is used for triggering the 2-step random access process.
Here, the network device (e.g., the base station) may determine whether the random access procedure of the terminal needs to be triggered according to specific needs, and what type of random access procedure is specifically triggered. In this embodiment of the present invention, before step 41, the network device may determine that a random access process of the terminal needs to be triggered when initiating a target operation for the terminal, determine that the random access process that needs to be initiated is a 2-step random access process or a 4-step random access process according to whether a requirement of the target operation on an operation delay is lower than a preset threshold, and enter step 41 to send the downlink control information when the random access process that needs to be initiated is the 2-step random access process. Specifically, the target operation includes, but is not limited to, the following operations:
re-acquiring the time adjustment quantity of the terminal;
adding an auxiliary cell for the terminal;
and positioning the terminal.
For example, when the network device needs to send downlink data to the terminal, if it is detected that the connection of the terminal is out of synchronization, that is, the uplink synchronization of the terminal is lost, it may be determined that a random access procedure of the terminal needs to be triggered to obtain a correct Time Adjustment (TA). Optionally, if the service delay requirement of the target service corresponding to the downlink data is lower than a preset threshold, the network device determines that the time adjustment amount needs to be obtained as soon as possible, and at this time, the network device may determine that the random access procedure to be initiated is a 2-step random access procedure.
For another example, when the network device adds a secondary cell to the terminal, it may be determined that a random access procedure of the terminal needs to be triggered. Optionally, if the network device needs to complete the addition of the secondary cell as soon as possible, it is determined that the random access procedure to be initiated is a 2-step random access procedure, otherwise, it is determined that the random access procedure to be initiated is a 4-step random access procedure.
Optionally, all frequency domain resource allocation domains of the downlink control information are set to 1.
Optionally, at least one preset bit in the downlink control information may be used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure. For example, the indication is performed by one bit of the last 10 bits of the downlink control information, such as the first bit of the last 10 bits.
And step 42, responding to a 2-step random access flow initiated by the terminal according to the downlink control information, and establishing connection with the terminal.
Through the steps, the embodiment of the invention realizes the triggering of the network equipment to the terminal random access flow, and can trigger the 2-step random access flow as required, thereby meeting the requirements of different operations on processing time delay.
Optionally, in this embodiment of the present invention, when the random access procedure triggered by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters, which is used to instruct the terminal to transmit a pilot frequency and/or a PUSCH according to the following parameters in the 2-step random access process:
pilot frequency index;
subcarrier spacing or system parameter (numerology) indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether the PUSCH is frequency hopped or not;
demodulation reference signal port, etc.
The method for triggering the random access procedure of the embodiment of the invention is introduced from the terminal and the network equipment side respectively. The above method will be explained below by a specific example, which specifically includes:
1) the base station adds an auxiliary cell for user 1 and user 2, respectively, and needs to measure uplink timing information from user 1 and user 2 to the auxiliary cell base station, so that the user needs to be triggered to perform an RACH procedure.
2) The base station configures the relevant parameters of 4-step RACH for the user 1 and simultaneously configures the relevant parameters of 4-step RACH and 2-step RACH for the user 2.
3) The base station triggers user 1 to perform 4-step RACH flow by using PDCCH order, specific DCI is scrambled by C-RNTI of user 1, and the information of the DCI is shown in Table 3
TABLE 3
Note that the access procedure is indicated as 0 at this time, as with the conventional reserved bit value, therefore, this design does not affect the mechanism of triggering UE RACH procedure by PDCCH in the prior art.
4) The base station triggers user 2 to perform a 2-step RACH procedure by using the PDCCH order, the specific DCI is scrambled by the C-RNTI of user 2, and the DCI information is shown in table 4, where table 4 further indicates a Modulation and Coding Scheme (MCS) for data transmission, and specifically may adopt an index number of the modulation and coding scheme, for example, the index is 2.
TABLE 4
5) The user 1 carries out a 4-step RACH process according to the relevant information; and the user 2 performs a 2-step RACH flow according to the relevant information, wherein in the msgA, the PUSCH adopts a modulation coding strategy with the index of 2 to perform data transmission.
Based on the method, the embodiment of the invention also provides equipment for implementing the method.
Referring to fig. 5, an embodiment of the present invention provides a terminal 50, including:
a transceiver 52, configured to receive downlink control information sent by a network;
and a processor 51, configured to initiate random access according to the 2-step random access procedure when the random access procedure triggered by the downlink control information is the 2-step random access procedure.
Optionally, the frequency domain resource allocation domain of the downlink control information is all 1.
Optionally, the downlink control information indicates, through at least one preset bit, that the triggered random access procedure is 2-step or 4-step random access. The processor is further configured to determine, according to at least one preset bit in the downlink control information, that a random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure.
Here, when the access procedure triggered by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter (numerology) indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether the PUSCH is frequency hopped or not;
demodulation reference signal port, etc.
Optionally, the processor 51 is further configured to transmit a pilot and/or a PUSCH according to the parameter in the process of initiating the 2-step random access.
Referring to fig. 6, another structure of a terminal according to an embodiment of the present invention is shown, where the terminal 600 includes: a processor 601, a transceiver 602, a memory 603, a user interface 604, and a bus interface, wherein:
in this embodiment of the present invention, the terminal 600 further includes: a program stored in the memory 603 and executable on the processor 601, the program when executed by the processor 601 implementing the steps of: receiving downlink control information sent by a network; and when the random access flow triggered by the downlink control information is a 2-step random access flow, initiating random access according to the 2-step random access flow.
In fig. 6, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 601 and various circuits of memory represented by memory 603 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 602 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 604 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 601 is responsible for managing the bus architecture and general processing, and the memory 603 may store data used by the processor 601 in performing operations.
Optionally, the frequency domain resource allocation domain of the downlink control information is all 1.
Optionally, when executed by the processor 603, the program may further implement the following steps: and determining that the random access flow triggered by the downlink control information is a 2-step random access flow or a 4-step random access flow according to at least one preset bit in the downlink control information.
Optionally, the indication information is indicated by one bit of the last 10 bits of the downlink control information.
Optionally, when the access procedure indicated by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter (numerology) indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether the PUSCH is frequency hopped or not;
demodulation reference signal port, etc.
Optionally, when executed by the processor 603, the program may further implement the following steps: and in the process of initiating the 2-step random access, transmitting pilot frequency and/or PUSCH according to the parameters.
Based on the terminal, the embodiment of the invention can respond to the trigger of the network equipment and initiate a 2-step random access or 4-step random access process.
Referring to fig. 7, an embodiment of the present invention provides a network device 70, including:
a transceiver 72, configured to send downlink control information to a terminal, where the downlink control information is used to trigger a 2-step random access procedure;
and the processor 71 is configured to respond to a 2-step random access procedure initiated by the terminal according to the downlink control information, and establish a connection with the terminal.
Optionally, the processor 71 is further configured to determine, when initiating a target operation for the terminal, whether a requirement of the target operation on an operation delay is lower than a preset threshold, that a random access procedure to be initiated is a 2-step random access procedure or a 4-step random access procedure.
Optionally, the target operation includes at least one of the following operations:
re-acquiring the time adjustment quantity of the terminal;
adding an auxiliary cell for the terminal;
and positioning the terminal.
Optionally, all frequency domain resource allocation domains of the downlink control information are set to 1.
Optionally, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure. For example, the indication is performed by one bit of the last 10 bits of the downlink control information.
Optionally, when the access procedure indicated by the indication information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter (numerology) indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether the PUSCH is frequency hopped or not;
demodulation reference signal port, etc.
Referring to fig. 8, another schematic structural diagram of a network device according to an embodiment of the present invention includes: a processor 801, a transceiver 802, a memory 803, and a bus interface, wherein:
in this embodiment of the present invention, the network device 800 further includes: a program stored on the memory 803 and executable on the processor 801, which when executed by the processor 801, performs the steps of: sending downlink control information to a terminal, wherein the downlink control information is used for triggering a 2-step random access process; responding to a 2-step random access flow initiated by the terminal according to the downlink control information, and establishing connection with the terminal.
In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 801, and various circuits, represented by the memory 803, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 802 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.
The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 801 in performing operations.
Optionally, the program may further implement the following steps when executed by the processor 803: when a target operation aiming at the terminal is initiated, determining that a random access flow to be initiated is a 2-step random access flow or a 4-step random access flow according to whether the requirement of the target operation on operation delay is lower than a preset threshold.
Optionally, the target operation includes at least one of the following operations:
re-acquiring the time adjustment quantity of the terminal;
adding an auxiliary cell for the terminal;
and positioning the terminal.
Optionally, all frequency domain resource allocation domains of the downlink control information are set to 1.
Optionally, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure.
Optionally, when the access procedure indicated by the indication information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter (numerology) indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether the PUSCH is frequency hopped or not;
demodulation reference signal port, etc.
Based on the network equipment, the embodiment of the invention can trigger the terminal to initiate a 2-step random access or 4-step random access process.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method for triggering random access according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (25)
1. A method for triggering random access is applied to a terminal, and is characterized by comprising the following steps:
receiving downlink control information sent by a network;
and when the random access flow triggered by the downlink control information is a 2-step random access flow, initiating random access according to the 2-step random access flow.
2. The method of claim 1, wherein the frequency domain resource allocation fields of the downlink control information are all 1.
3. The method of claim 1, wherein after receiving the downlink control information, the method further comprises:
and determining that the random access flow triggered by the downlink control information is a 2-step random access flow or a 4-step random access flow according to at least one preset bit in the downlink control information.
4. The method according to any one of claims 1 to 3, wherein when the downlink control information indicates that the triggered random access procedure is a 2-step random access procedure, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information used for indicating whether a Physical Uplink Shared Channel (PUSCH) is subjected to frequency hopping;
a demodulation reference signal port.
5. The method of claim 4, further comprising:
and in the process of initiating random access according to the 2-step random access flow, transmitting pilot frequency and/or PUSCH according to the parameters.
6. A method for triggering random access is applied to network equipment and is characterized by comprising the following steps:
sending downlink control information to a terminal, wherein the downlink control information is used for triggering a 2-step random access process;
responding to a 2-step random access flow initiated by the terminal according to the downlink control information, and establishing connection with the terminal.
7. The method of claim 6, wherein prior to transmitting the downlink control information, the method further comprises:
when the network equipment initiates target operation aiming at the terminal, the network equipment determines that the random access flow needing to be initiated is a 2-step random access flow or a 4-step random access flow according to whether the requirement of the target operation on operation delay is lower than a preset threshold.
8. The method of claim 7, wherein the target operation comprises at least one of:
re-acquiring the time adjustment quantity of the terminal;
adding an auxiliary cell for the terminal;
and positioning the terminal.
9. The method of claim 6,
and all frequency domain resource allocation domains of the downlink control information are set to be 1.
10. The method of claim 9,
at least one preset bit in the downlink control information is used for indicating that the triggered random access flow is a 2-step random access flow or a 4-step random access flow.
11. The method according to any of claims 6 to 10, wherein when the random access procedure triggered by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether the PUSCH is frequency hopped or not;
a demodulation reference signal port.
12. A terminal, comprising:
the transceiver is used for receiving downlink control information sent by a network;
and the processor is used for initiating random access according to the 2-step random access flow when the random access flow triggered by the downlink control information is the 2-step random access flow.
13. The terminal of claim 12, wherein the frequency domain resource allocation fields of the downlink control information are all 1.
14. The terminal of claim 12,
the processor is further configured to determine, according to at least one preset bit in the downlink control information, that a random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure.
15. The terminal according to any of claims 12 to 14,
when the random access procedure triggered by the downlink control information is a 2-step random access procedure, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information used for indicating whether a Physical Uplink Shared Channel (PUSCH) is subjected to frequency hopping;
a demodulation reference signal port.
16. The terminal of claim 15, further comprising:
the processor is further configured to transmit a pilot and/or a PUSCH according to the parameter in a process of initiating random access according to the 2-step random access procedure.
17. A terminal, comprising: memory, processor and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of triggering random access according to any of claims 1 to 5.
18. A network device, comprising:
the transceiver is used for sending downlink control information to the terminal, and the downlink control information is used for triggering a 2-step random access process;
and the processor is used for responding to a 2-step random access flow initiated by the terminal according to the downlink control information and establishing connection with the terminal.
19. The network device of claim 18,
the processor is further configured to determine that a random access procedure to be initiated is a 2-step random access procedure or a 4-step random access procedure according to whether a requirement of the target operation on operation delay is lower than a preset threshold when the target operation for the terminal is initiated.
20. The network device of claim 19,
the target operation comprises at least one of:
re-acquiring the time adjustment quantity of the terminal;
adding an auxiliary cell for the terminal;
and positioning the terminal.
21. The network device of claim 18,
and all frequency domain resource allocation domains of the downlink control information are set to be 1.
22. The network device of claim 21,
at least one preset bit in the downlink control information is used for indicating that the triggered random access flow is a 2-step random access flow or a 4-step random access flow.
23. The network device according to any of claims 18 to 22, wherein when the random access procedure triggered by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:
pilot frequency index;
subcarrier spacing or system parameter numerology indication information;
waveform indication information;
a modulation coding strategy;
frequency hopping indication information for indicating whether to frequency hop;
a demodulation reference signal port.
24. A network device, comprising: memory, processor and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of triggering random access according to any of claims 5 to 11.
25. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a program which, when being executed by a processor, carries out the steps of the method of triggering random access according to any one of claims 1 to 11.
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| CN201910580231.7A CN112153741A (en) | 2019-06-28 | 2019-06-28 | Method, terminal and network equipment for triggering random access |
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