CN113079582A - Random access method and device - Google Patents
Random access method and device Download PDFInfo
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- CN113079582A CN113079582A CN202010010875.5A CN202010010875A CN113079582A CN 113079582 A CN113079582 A CN 113079582A CN 202010010875 A CN202010010875 A CN 202010010875A CN 113079582 A CN113079582 A CN 113079582A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/0858—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision detection
Abstract
The embodiment of the invention provides a random access method and a device, wherein the method comprises the following steps: if the number of the synchronization signal blocks SSB successfully listened before the LBT on the frequency domain is more than or equal to 2, the message A is sent on the time-frequency resource RO of the physical random access channel mapped by each SSB. The random access method and the random access device provided by the embodiment of the invention fully utilize frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a random access method and apparatus.
Background
In the 5G NR, a terminal (User Equipment, UE) selects a physical random access channel time-frequency resource (PRACH occupancy, RO) to transmit a random access preamble. The time domain format of RO is specified by a format table in R15, and the mapping relationship between RO and a Synchronization Signal Block (SSB) in the frequency domain is specified by a parameter. Fig. 1 is a schematic diagram of a mapping relationship between SSB and RO in the prior art, and as shown in fig. 1, the mapping relationship between RO and SSB in the frequency domain may be many-to-one, or one-to-many.
In the prior art, the UE selects 1 SSB mapped RO to transmit the random access preamble, the range of the random access preamble carried on each RO is determined according to the parameter CB-PreamblePerSSB, and if a plurality of SSBs map 1 RO, the starting index numbers of the random access preamble indexes carried on the ROs are different.
For an independent NR-U system, the UE receives the SSB first, performs Listen Before Talk (LBT) on the frequency domain SSB that can be received, selects an RO mapped by the successful SSB, and sends a message a with two steps of random access, where the message a includes a random access preamble and a message payload (Msg a payload). And the base station gNB receives the message A through the RO, receives the message load on the PUSCH, and performs the subsequent process after the detection is successful.
However, with the scheme in the prior art, because there are many interference factors of the radio channel, when the radio channel is interfered, it is easy for the gNB to receive the message a, so that the success rate of the gNB receiving the message a is low.
Disclosure of Invention
The embodiment of the invention provides a random access method and a random access device, which are used for solving the technical problems in the prior art.
In order to solve the foregoing technical problem, in one aspect, an embodiment of the present invention provides a random access method, including:
if the number of the synchronous signal blocks SSB successfully listened before the LBT on the frequency domain is more than or equal to 2, simultaneously sending a message A on the time-frequency resource RO of the physical random access channel mapped by each SSB;
and waiting for receiving the random access response message sent by the base station.
Further, the index value of the random access preamble included in the message a transmitted on each RO is the same.
Further, before sending the message a on the time-frequency resource RO of the physical random access channel mapped by each SSB, the method further includes:
an index value of the random access preamble contained in the message a is determined.
Further, before sending the message a on the time-frequency resource RO of the physical random access channel mapped by each SSB, the method further includes:
and determining the radio network temporary identifier RNTI contained in the message A according to the preamble index value and the initial time domain information of the RO.
Further, the RNTI included in the message a is determined by the following formula:
RNTI＝1+s_id+14*t_id+index+14*80*8*ul_carrier_id
wherein s _ id is an index of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the RO, t _ id is an index of a first time slot of the RO in the system frame, index is a preamble index value, and ul _ carrier _ id is an uplink carrier type indicator for transmitting the random access preamble.
In another aspect, an embodiment of the present invention provides a random access method, including:
receiving a message a from a different RO;
and if the message A on each RO is sent by the same terminal, performing random access response based on the receiving power of the message A on each RO.
In another aspect, an embodiment of the present invention provides a terminal, including:
a sending module, configured to send a message a on a time-frequency resource RO of a physical random access channel mapped by each SSB simultaneously if the number of synchronization signal blocks SSB that listen before talk over LBT succeeds in a frequency domain is greater than or equal to 2;
and the waiting module is used for waiting for receiving the random access response message sent by the base station.
In another aspect, an embodiment of the present invention provides a base station, including:
a receiving module, configured to receive a message a from different ROs;
and the response module is used for carrying out random access response based on the receiving power of the message A on each RO if the message A on each RO is sent by the same terminal.
In another aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above method when executing the computer program.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the above method.
The random access method and the random access device provided by the embodiment of the invention fully utilize frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Drawings
FIG. 1 is a diagram illustrating a mapping relationship between SSBs and ROs in the prior art;
fig. 2 is a schematic diagram of a random access method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of preamble range selection according to an embodiment of the present invention;
fig. 4 is a diagram illustrating a random access method according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a terminal according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
5G NR-U, collectively referred to as 5G NR in Ullicensed Spectrum, is a 5G NR operating in Unlicensed Spectrum. Two modes are licensed-spectrum assisted access (LAA) NR-U and Stand-alone NR-U.
The independent NR-U mode has the following characteristics:
1. the unlicensed band time domain cannot be guaranteed to be available at any time. Using LBT technology, before occupying the channel, an idle channel is evaluated, if LBT succeeds, the channel is idle, can be continuously occupied for transmitting messages, and the maximum transmission time length is limited; if LBT fails, transmission cannot be performed.
2. Unlicensed bands have ample bandwidth available.
Compared with 5G NR, the biggest characteristics and challenges of NR-U are due to the support of LBT mechanisms and the impact of LBT failure. In the system, the message interaction is carried out between the UE and the gNB in the random access process, and the message can be sent only if the LBT succeeds, so that compared with the 4-step random access, the 2-step random access is more beneficial to the UE to finish the random access as soon as possible due to the fact that the interaction times of the UE and the gNB are reduced.
The 2-step Random Access procedure involves a message a and a message B, where the message a is a message sent by the UE to the gNB, and includes a Random Access preamble carried on a Physical Random Access Channel (PRACH) and a message payload (Msg a payload) in the message a carried on a Physical Uplink Shared Channel (PUSCH). The preamble configuration mode in the 2-step random access is the same as that in the 4-step random access.
In the independent NR-U mode, the UE first receives the SSBs, performs LBT on the frequency domain SSBs that can be received, and selects a successful SSB to send the preamble sequence and the message load in the message a according to the RO configuration. And the gNB receives the message A through the RO, receives the message load on the PUSCH, and performs subsequent processes after the detection is successful.
However, with the scheme in the prior art, because there are many interference factors of the radio channel, when the radio channel is interfered, it is easy for the gNB to receive the message a, so that the success rate of the gNB receiving the message a is low.
In order to solve the above technical problem, embodiments of the present invention provide a random access method, which fully utilizes frequency domain resources in a random access process of an NR-U system, and a terminal sends the same message a on all available ROs mapped by SSBs, so as to achieve the purpose of utilizing the frequency domain as much as possible at the same time, and improve the success probability of receiving the message a by a base station.
Fig. 2 is a schematic diagram of a random access method according to an embodiment of the present invention, and as shown in fig. 2, an embodiment of the present invention provides a random access method, where an execution subject is a terminal, for example, a mobile phone. The method comprises the following steps:
step S201, if the number of the synchronization signal blocks SSB successfully listened before the LBT in the frequency domain is more than or equal to 2, the message A is sent on the time-frequency resource RO of the physical random access channel mapped by each SSB.
Specifically, in the independent NR-U mode, the UE receives the SSBs first and performs LBT on the frequency domain SSBs that can be received.
And if the number of the SSBs with successful LBT in the frequency domain is more than or equal to 2, the UE simultaneously sends a message A on the time-frequency resource RO of the physical random access channel mapped by each SSB.
For example, the number of SSBs for which the LBT of the UE succeeds in the frequency domain is M, and the RO bearer message a mapped by the N SSBs with the lowest interference energy at the time of LBT is selected. N messages A are sent simultaneously, and N is larger than or equal to 2. Message a includes a preamble carried on the PRACH and a message payload in message a carried on the PUSCH.
Step S202, waiting for receiving the random access response message sent by the base station.
Specifically, after sending the message a through a plurality of ROs, the UE waits to receive the random access response message sent by the gNB.
And when the gNB receives the messages A from different ROs at the same time, judging whether the messages A come from the same user or not according to the user identity information carried by the message load in the messages A, and if the messages A come from the same user, the gNB selects the frequency band for replying the message B according to the receiving power and the next LBT result.
Before the gNB sends a random access response message to the UE, the message A needs to be analyzed, if the gNB successfully receives a decoding preamble and also successfully decodes an Msg A payload, a successful response message needs to be returned, the content of the successful response message comprises Msg 2 and Msg 4 contents (namely competition resolving information for resolving conflict of a plurality of UEs) similar to the 4-step random access process, and the UE judges that the 2-step random access is successful when receiving the successful response returned by the gNB.
If the gNB only successfully decodes the preamble but not successfully decodes the Msg A payload, a fallback (fallback) response message needs to be returned, and the UE receives the fallback response, determines that the 2-step random access fails, and then falls back to the 4-step random access process to send the Msg 3.
If the gNB does not successfully decode the preamble or does not decode the Msg A payload, no response message can be returned, and after the random access response receiving window is overtime, the UE judges that the random access fails and tries to resend the Msg A.
The random access method provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Further, according to any of the above embodiments, the index value of the random access preamble included in the message a sent on each RO is the same.
Specifically, in the embodiment of the present invention, the index values of the random access preambles included in the message a sent by the UE through each RO are the same, so as to ensure that the message a received by the gNB on different ROs is completely the same.
The random access method provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Based on any of the foregoing embodiments, further before sending the message a on the time-frequency resource RO of the physical random access channel mapped by each SSB, the method further includes:
an index value of the random access preamble contained in the message a is determined.
Specifically, the higher layer associates one RO (frequency domain) with N SSBs by parameter SSB-perRACH-occupancy and dcb-preamble Perss B configuration (L1 parameter: SSB-per-rach-event), and the number of preambles per SSB on a contention basis per active PRACH event (L1 parameter: CB-preambles-per-SSB). The configuration for N is two of the following:
if N <1, one SSB maps to 1/N consecutive valid ROs (frequency domain), e.g., N1/8, one SSB maps 8 ROs and R consecutive indexed preambles map to SSBn, 0< ═ N-1, each valid RO starting from preamble index 0. For example, if N is 1/8, then one SSB maps 8 ROs, and then there are 8 starting points with preamble index 0 in one SSB, because one RO corresponds to one starting point with preamble index 0. .
If N is present>R continuously indexed preambles map to SSBn, 0 ═ 1<＝n<Each valid RO is indexed from the preamble
And starting. For example, N-2, 64, then two SSBs map 1 RO, then SSBn-0, where:
1) when n is 0, the preamble index at SSB0 starts with 0;
2) when n is 1, the preamble index at SSB1 starts at 32;
3) the preamble index on the SSB0 is 0-31, and the preamble index on the SSB1 is 32-configured competition preamble-1;
4) one valid RO corresponds to the whole contention preamble number, and at this time, one valid RO covers two SSBs, so that two SSBs each occupy a partial preamble, which is different from N < 1.
Wherein the content of the first and second substances,
configured by totalNumberOfRA-Preambles and is an integer multiple of N.
Therefore, in the embodiment of the present invention, before the UE sends the message a on each of the ROs mapped by the SSB, it is further required to determine the index value of the random access preamble included in the message a.
Fig. 3 is a diagram illustrating preamble range selection according to an embodiment of the present invention, and as shown in fig. 3, when the SSBs and ROs are mapped in one-to-one or multiple ways, the range of each SSB is consistent, and the UE selects the same preamble index.
When the mapping of SSBs and ROs is many-to-one, the UE selects the preamble index range of the first of the available SSBs as its own selection range, and transmits a preamble using the same preamble index on these SSBs.
The random access method provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Based on any of the foregoing embodiments, further before sending the message a on the time-frequency resource RO of the physical random access channel mapped by each SSB, the method further includes:
and determining the radio network temporary identifier RNTI contained in the message A according to the preamble index value and the initial time domain information of the RO.
Specifically, in the embodiment of the present invention, in the message a, the message payload transmitted through the PUSCH immediately follows the preamble. The message a transmitted on different ROs is identical, including the RNTI. In the NR-U of the independent mode, the value of RNTI included in the message payload of the message a is related to the index value of the preamble transmitted previously, the start time domain information.
Therefore, before the message a is sent on each RO mapped by the SSB, the RNTI included in the message a needs to be determined according to the preamble index value and the start time domain information of the RO.
The random access method provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Based on any of the above embodiments, further, the RNTI included in the message a is determined by the following formula:
RNTI＝1+s_id+14*t_id+index+14*80*8*ul_carrier_id
wherein s _ id is an index of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the RO, t _ id is an index of a first time slot of the RO in the system frame, index is a preamble index value, and ul _ carrier _ id is an uplink carrier type indicator for transmitting the random access preamble.
Specifically, in the embodiment of the present invention, the following formula is adopted in a manner of determining the RNTI included in the message a according to the preamble index value and the start time domain information of the RO:
RNTI＝1+s_id+14*t_id+index+14*80*8*ul_carrier_id
wherein s _ id is an index of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the RO, s _ id is greater than or equal to 0 and less than 14, t _ id is an index of a first slot of the RO in the system frame, t _ id is greater than or equal to 0 and less than 80, index is a preamble index value, index is greater than or equal to 0 and less than 64, ul _ carrier _ id is an uplink carrier type indicator for transmitting the random access preamble, ul _ carrier _ id is 0 and represents a NUL carrier, and ul _ carrier _ id is 1 and represents a SUL carrier.
The random access method provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Based on any of the above embodiments, fig. 4 is a schematic diagram of a random access method according to another embodiment of the present invention, and as shown in fig. 4, an embodiment of the present invention provides a random access method whose execution subject is a base station. The method comprises the following steps:
step S401, receiving a message a from a different RO.
Step S402, if the message A on each RO is sent by the same terminal, the random access response is carried out based on the receiving power of the message A on each RO.
Specifically, in the independent NR-U mode, the UE receives the SSBs first and performs LBT on the frequency domain SSBs that can be received.
And if the number of the SSBs with successful LBT in the frequency domain is more than or equal to 2, the UE simultaneously sends a message A on the time-frequency resource RO of the physical random access channel mapped by each SSB.
For example, the number of SSBs for which the LBT of the UE succeeds in the frequency domain is M, and the RO bearer message a mapped by the N SSBs with the lowest interference energy at the time of LBT is selected. N messages A are sent simultaneously, and N is larger than or equal to 2. Message a includes a preamble carried on the PRACH and a message payload in message a carried on the PUSCH.
The gNB receives message a from a different RO.
And when the gNB receives the messages A from different ROs at the same time, judging whether the messages A come from the same user or not according to the user identity information carried by the message load in the messages A, and if the messages A come from the same user, the gNB selects the frequency band for replying the message B according to the receiving power and the next LBT result.
Before the gNB sends a random access response message to the UE, the message A needs to be analyzed, if the gNB successfully receives a decoding preamble and also successfully decodes an Msg A payload, a successful response message needs to be returned, the content of the successful response message comprises Msg 2 and Msg 4 contents (namely competition resolving information for resolving conflict of a plurality of UEs) similar to the 4-step random access process, and the UE judges that the 2-step random access is successful when receiving the successful response returned by the gNB.
If the gNB only successfully decodes the preamble but not successfully decodes the Msg A payload, a fallback (fallback) response message needs to be returned, and the UE receives the fallback response, determines that the 2-step random access fails, and then falls back to the 4-step random access process to send the Msg 3.
If the gNB does not successfully decode the preamble or does not decode the Msg A payload, no response message can be returned, and after the random access response receiving window is overtime, the UE judges that the random access fails and tries to resend the Msg A.
The random access method provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Based on any of the above embodiments, fig. 5 is a schematic diagram of a terminal provided in an embodiment of the present invention, and as shown in fig. 5, an embodiment of the present invention provides a terminal, for example, a mobile phone. The terminal comprises a sending module 501 and a waiting module 502, wherein:
the sending module 501 is configured to send a message a on a time-frequency resource RO of a physical random access channel mapped by each SSB simultaneously if the number of SSBs that listen before talk over LBT succeeds in a frequency domain is greater than or equal to 2; the waiting module 502 is configured to wait for receiving a random access response message sent by a base station.
Embodiments of the present invention provide a terminal, configured to execute a method in which an execution subject is a terminal in any of the above embodiments, where specific steps of executing the method in one of the above embodiments by using the apparatus provided in this embodiment are the same as those in the corresponding embodiments described above, and are not described herein again.
The terminal provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Based on any of the above embodiments, fig. 6 is a schematic diagram of a base station provided in an embodiment of the present invention, and as shown in fig. 6, an embodiment of the present invention provides a base station, which includes a receiving module 601 and a response module 602, where:
the receiving module 601 is configured to receive a message a from different ROs; the response module 602 is configured to perform a random access response based on the received power of the message a on each RO if the message a on each RO is sent by the same terminal.
Embodiments of the present invention provide a base station, configured to execute a method whose execution main body is the base station in any of the above embodiments, where specific steps of executing the method described in one above embodiment by using the apparatus provided in this embodiment are the same as those in the corresponding embodiments described above, and are not described herein again.
The base station provided by the embodiment of the invention fully utilizes frequency domain resources in the random access process of the NR-U system, and the terminal sends the same message A on all available RO mapped by SSB, thereby achieving the purpose of utilizing the frequency domain as much as possible at the same time and improving the success probability of receiving the message A by the base station.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 7, the electronic device includes: a processor (processor)701, a communication Interface (Communications Interface)702, a memory (memory)703 and a communication bus 704, wherein the processor 701, the communication Interface 702 and the memory 703 complete communication with each other through the communication bus 704. The processor 701 and the memory 702 communicate with each other via a bus 703. The processor 701 may call logic instructions in the memory 703 to perform the following method:
if the number of the synchronous signal blocks SSB successfully listened before the LBT on the frequency domain is more than or equal to 2, simultaneously sending a message A on the time-frequency resource RO of the physical random access channel mapped by each SSB; and waiting for receiving the random access response message sent by the base station.
Or the following method:
receiving a message a from a different RO; and if the message A on each RO is sent by the same terminal, performing random access response based on the receiving power of the message A on each RO.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. 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 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 according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Further, embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the steps of the above-described method embodiments, for example, including:
if the number of the synchronous signal blocks SSB successfully listened before the LBT on the frequency domain is more than or equal to 2, simultaneously sending a message A on the time-frequency resource RO of the physical random access channel mapped by each SSB; and waiting for receiving the random access response message sent by the base station.
Or the following method:
receiving a message a from a different RO; and if the message A on each RO is sent by the same terminal, performing random access response based on the receiving power of the message A on each RO.
Further, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above method embodiments, for example, including:
if the number of the synchronous signal blocks SSB successfully listened before the LBT on the frequency domain is more than or equal to 2, simultaneously sending a message A on the time-frequency resource RO of the physical random access channel mapped by each SSB; and waiting for receiving the random access response message sent by the base station.
Or the following method:
receiving a message a from a different RO; and if the message A on each RO is sent by the same terminal, performing random access response based on the receiving power of the message A on each RO.
The above-described embodiments of the apparatus are merely illustrative, and 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A random access method, comprising:
if the number of the synchronous signal blocks SSB successfully listened before the LBT on the frequency domain is more than or equal to 2, simultaneously sending a message A on the time-frequency resource RO of the physical random access channel mapped by each SSB;
and waiting for receiving the random access response message sent by the base station.
2. The random access method of claim 1, wherein the index value of the random access preamble included in the message a transmitted on each RO is the same.
3. The random access method according to claim 2, wherein before sending the message a on each of the SSB-mapped physical random access channel time-frequency resources RO, the method further comprises:
an index value of the random access preamble contained in the message a is determined.
4. The random access method of claim 1, wherein before sending the message a on each of the SSB-mapped physical random access channel time-frequency resources RO, the method further comprises:
and determining the radio network temporary identifier RNTI contained in the message A according to the preamble index value and the initial time domain information of the RO.
5. The random access method according to claim 4, wherein the RNTI included in the message A is determined by the following formula:
RNTI＝1+s_id+14*t_id+index+14*80*8*ul_carrier_id
wherein s _ id is an index of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the RO, t _ id is an index of a first time slot of the RO in the system frame, index is a preamble index value, and ul _ carrier _ id is an uplink carrier type indicator for transmitting the random access preamble.
6. A random access method, comprising:
receiving a message a from a different RO;
and if the message A on each RO is sent by the same terminal, performing random access response based on the receiving power of the message A on each RO.
7. A terminal, comprising:
a sending module, configured to send a message a on a time-frequency resource RO of a physical random access channel mapped by each SSB simultaneously if the number of synchronization signal blocks SSB that listen before talk over LBT succeeds in a frequency domain is greater than or equal to 2;
and the waiting module is used for waiting for receiving the random access response message sent by the base station.
8. A base station, comprising:
a receiving module, configured to receive a message a from different ROs;
and the response module is used for carrying out random access response based on the receiving power of the message A on each RO if the message A on each RO is sent by the same terminal.
9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the random access method according to any of claims 1 to 6.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the random access method according to any one of claims 1 to 6.
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| WO2023071843A1 (en) * | 2021-10-29 | 2023-05-04 | 北京紫光展锐通信技术有限公司 | Resource mapping method and apparatus, terminal and network device |
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