CN116981071A - Random access method and equipment - Google Patents

Random access method and equipment Download PDF

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Publication number
CN116981071A
CN116981071A CN202210392022.1A CN202210392022A CN116981071A CN 116981071 A CN116981071 A CN 116981071A CN 202210392022 A CN202210392022 A CN 202210392022A CN 116981071 A CN116981071 A CN 116981071A
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China
Prior art keywords
random access
target
beams
preamble
network device
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CN202210392022.1A
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Chinese (zh)
Inventor
邓云
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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Priority to CN202210392022.1A priority Critical patent/CN116981071A/en
Priority to PCT/CN2023/087499 priority patent/WO2023198022A1/en
Publication of CN116981071A publication Critical patent/CN116981071A/en
Pending legal-status Critical Current

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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
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • 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]
    • 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

Abstract

The embodiment of the application provides a random access method and equipment, which relate to the technical field of communication and comprise the following steps: the UE respectively sends target lead codes to the network equipment aiming at a plurality of first beams, wherein the target lead codes are lead codes corresponding to the target beams with the strongest signal strength in the plurality of first beams; after receiving the target preamble, the network device can determine the target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam, and further can send RAR to the UE by using the target beam with the strongest signal strength, thereby not only reducing the processing complexity of the UE and the network device, but also improving the success rate of random access.

Description

Random access method and equipment
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a random access method and equipment.
Background
In a New Radio (NR) system coverage enhancement scenario, a User Equipment (UE) may utilize multiple beams to perform random access, that is, the UE may use the multiple beams to transmit a Preamble (Preamble) respectively.
When the network device receives the Preamble sent by the UE by using a plurality of different beams, if the random access response (Random Access Response, abbreviated as RAR) is also sent to the UE by using the plurality of different beams, the sent RARs may overlap in time domain, the UE simultaneously receives the RARs sent by different beams, the processing complexity requirement on the UE is high, meanwhile, the network device sends the RAR by using the plurality of beams, which also causes waste of transmission resources, and sends the RAR by using the beam with poor signal condition, and the probability of transmission failure is high.
Disclosure of Invention
The embodiment of the application provides a random access method and equipment, which can enable network equipment to select a beam with strongest signal strength to send RAR to UE in the multi-beam random access process, thereby reducing the processing complexity of the UE and the network equipment and improving the success rate of random access.
In a first aspect, an embodiment of the present application provides a random access method, applied to a UE, where the method includes:
transmitting target lead codes to network equipment respectively aiming at a plurality of first beams, wherein the target lead codes are lead codes corresponding to target beams with strongest signal strength in the plurality of first beams;
and receiving a random access response sent by the network equipment.
In a possible implementation manner, the receiving the random access response sent by the network device includes:
the random access response is received on the target beam or the random access response is received continuously on the target beam.
In a possible implementation manner, the plurality of first beams are the first beams of the serving cell where the UE currently camps, and the first beams are ordered from strong to weak in signal strength.
In a possible implementation manner, before the target preambles are sent to the network device for the plurality of first beams respectively, the method further includes:
Determining a first plurality of first beams with the signal strength ordered from strong to weak in a service cell where the UE currently resides, and a target beam with the strongest signal strength in the first plurality of beams;
and selecting one preamble code from a plurality of preamble codes corresponding to the target beam as the target preamble code.
In a possible implementation manner, the sending the target preambles to the network device for the plurality of first beams respectively includes:
using the sending times of the target preamble, respectively sending the target preamble on random access occasions (RACH (Random Access Channel) Occasions, abbreviated as RO) corresponding to the first beams; wherein the number of times of sending the target preamble is determined by the system message of the serving cell.
In one possible implementation, the demodulation reference signal (DeModulation Reference Signal, DMRS) receiving the random access response is gaussian coexisting with the target beam.
In a possible implementation manner, the receiving the random access response sent by the network device includes:
determining a Random Access radio network temporary identifier (RA-RNTI) according to the RO corresponding to the target beam;
And receiving the random access response sent by the network equipment by utilizing the target beam according to the RA-RNTI.
In a second aspect, an embodiment of the present application provides a random access method, applied to a network device, where the method includes:
respectively receiving target lead codes sent by UE aiming at a plurality of first beams;
determining a target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam;
and sending a random access response to the UE by utilizing the target beam.
In a third aspect, an embodiment of the present application provides a random access apparatus, applied to a UE, where the apparatus includes:
a sending module, configured to send target preambles to a network device for a plurality of first beams, where the target preambles are preambles corresponding to target beams with strongest signal strengths in the plurality of first beams;
and the receiving module is used for receiving the random access response sent by the network equipment.
In a fourth aspect, an embodiment of the present application provides a random access apparatus, applied to a network device, where the apparatus includes:
a receiving module, configured to receive target preambles sent by a user equipment UE for a plurality of first beams respectively;
A determining module, configured to determine a target beam corresponding to the target preamble according to a correspondence between the preamble and the beam;
and the sending module is used for sending a random access response to the UE by utilizing the target beam.
In a fifth aspect, an embodiment of the present application provides a user equipment, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes computer-executable instructions stored by the memory, causing the at least one processor to perform a random access method as provided in the first aspect.
In a sixth aspect, an embodiment of the present application provides a network device, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes computer-executable instructions stored by the memory to cause the at least one processor to perform a random access method as provided in the second aspect.
In a seventh aspect, an embodiment of the present application provides a computer readable storage medium having stored therein computer executable instructions that, when executed by a processor, implement the random access method as provided in the first aspect.
Alternatively, the random access method as provided in the second aspect is implemented when the processor executes the computer-executable instructions.
In an eighth aspect, embodiments of the present application provide a computer program product comprising a computer program which, when executed by a processor, implements a random access method as provided in the first aspect, or implements a random access method as provided in the second aspect.
According to the random access method and the random access device provided by the embodiment of the application, the UE respectively sends the target lead codes to the network device aiming at a plurality of first beams, wherein the target lead codes are lead codes corresponding to the target beam with the strongest signal strength in the plurality of first beams; after receiving the target preamble, the network device can determine the target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam, and further can send RAR to the UE by using the target beam with the strongest signal strength, thereby not only reducing the processing complexity of the UE and the network device, but also improving the success rate of random access.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, a brief description will be given below of the drawings required for the embodiments of the present application or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application;
fig. 2 is a signaling diagram of a competitive random access procedure according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a random access method according to an embodiment of the present application;
fig. 4 is a signaling diagram of a random access method according to an embodiment of the present application;
fig. 5 is a schematic program module of a random access device according to an embodiment of the present application;
fig. 6 is a schematic program module of another random access device according to an embodiment of the present application;
fig. 7 is a schematic hardware structure of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application can be applied to various communication systems, such as: a long term evolution advanced (Advanced long term evolution, LTE-a) system, a New Radio (NR) system, an evolution system of the NR system, an LTE-based access to unlicensed spectrum, LTE-U system over unlicensed spectrum, an NR-based access to unlicensed spectrum, NR-U system over unlicensed spectrum, a universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), a wireless local area network (Wireless Local Area Networks, WLAN), a wireless fidelity (Wireless Fidelity, wiFi), a next generation communication system, or other communication system, and the like.
Generally, the number of connections supported by the conventional communication system is limited and easy to implement, however, as the communication technology advances, the mobile communication system will support not only conventional communication but also, for example, device-to-Device (D2D) communication, machine-to-machine (Machine to Machine, M2M) communication, machine type communication (Machine Type Communication, MTC), inter-vehicle (Vehicle to Vehicle, V2V) communication, and the like, to which the embodiments of the present application can also be applied.
Optionally, the communication system in the embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or a Stand Alone (SA) fabric scenario.
The frequency spectrum of the application of the embodiment of the application is not limited. For example, the embodiment of the application can be applied to licensed spectrum and unlicensed spectrum.
Referring to fig. 1, fig. 1 is a schematic diagram of an architecture of a wireless communication system according to an embodiment of the present application. The wireless communication system provided in this embodiment includes a UE101 and a network device 102.
Alternatively, the UE101 can refer to various forms of user equipment, access terminals, subscriber units, subscriber stations, mobile Stations (MS), remote stations, remote terminals, mobile devices, terminal devices (terminal equipment), wireless communication devices, user agents, or user equipment. But also a cellular phone, a cordless phone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a palm top (Personal Digital Assistant, PDA) a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a car-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (Public Land Mobile Network, PLMN) etc., as long as the UE101 is capable of wireless communication with the network device 102.
Optionally, the network device 102, i.e. public mobile communication network device, is an interface device for accessing the internet by the UE101, and is also a form of a radio Station, which refers to a radio transceiver Station for performing information transfer with the UE101 in a certain radio coverage area, and includes a Base Station (BS), which may also be referred to as a Base Station device, and is an apparatus deployed in a radio access network (Radio Access Network, RAN) to provide a wireless communication function. For example, the device for providing a base station function in the 2G network includes a base radio transceiver station (Base Transceiver Station, abbreviated as BTS), the device for providing a base station function in the 3G network includes a node B (NodeB), the device for providing a base station function in the 4G network includes an evolved NodeB (eNB), the device for providing a base station function in the wireless local area network (Wireless Local Area Networks, abbreviated as WLAN) is an Access Point (AP), the device for providing a base station function in the 5G NR includes a gNB, and a continuously evolved NodeB (ng-eNB), wherein the gNB and the UE communicate using NR technology, the ng-eNB and the UE communicate using evolved universal terrestrial radio Access network (Evolved Universal Terrestrial Radio Access, abbreviated as E-UTRA) technology, and the gNB and the ng-eNB are both connectable to the 5G core network. The network device 102 in the embodiment of the present application further includes a device that provides a base station function in a new communication system in the future, and the like.
The embodiment of the application defines a unidirectional communication link from an access network to UE as a downlink, wherein data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called as a downlink direction; and the unidirectional communication link from the UE to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is called as uplink direction.
In one possible implementation, the network device may send uplink scheduling information (UL Grant) to the UE via downlink control information (Downlink Control Information, DCI for short), indicating uplink physical shared channel (Physical Uplink Shared Channel, PUSCH for short) transmission, so that the UE sends data.
When the UE accesses the network, it needs to initiate random access to acquire uplink synchronization. The UE in the connected state also needs to initiate random access in some scenarios, for example, when uplink is out of step, if the UE has uplink data to transmit, the UE needs to initiate competitive random access (Contention based Random Access Procedure); when uplink is out of step, if the base station needs to send data to the UE, the base station can trigger the UE to execute random access (competitive or non-competitive random access) through physical downlink control signaling; after the UE sends a scheduling request up to a preset threshold number of times, if the base station has not sent UL Grant to the UE yet, the UE needs to trigger competitive random access.
Referring to fig. 2, fig. 2 is a signaling diagram of a competitive random access procedure according to an embodiment of the present application, and in some embodiments, the competitive random access procedure includes:
step 1: the UE randomly selects a preamble (preamble) to transmit on a physical random access channel (Physical Random Access Channel, abbreviated PRACH). Namely, send Msg1: a random access preamble (Random Access Preamble).
Step 2: the UE receives a random access response (Random Access Response, abbreviated as RAR), i.e., msg2, sent by the network device.
Step 3: the UE transmits scheduling transmission information (Scheduled Transmission), i.e., msg3, according to the uplink resources included in the RAR.
Wherein, when the UE initially accesses the network, MSG3 contains an RRC connection request; when the UE performs a handover, MSG3 includes a handover complete message.
Step 4: if the UE receives conflict resolution information (Contention Resolution), namely Msg4, the conflict resolution is considered to be successful, the random access process is considered to be successful, and if the scheduling of the base station is not received within a certain time, the conflict resolution is considered to be failed.
In 5G, because 5G is deployed at high frequency, the wireless signal exhibits good directivity and large path loss at high frequency, and a large serving cell requires multiple beams (beams) to achieve complete coverage, and one Beam can only cover a limited range. A small serving cell may contain only one beam. For a serving cell composed of multiple beams, not all beams can be transmitted at the same time due to hardware limitations, and time-sharing transmission, i.e., beam scanning (Beam scanning), is required.
When the UE performs random access, the UE needs to firstly confirm the Beam with the strongest signal strength, namely the strongest synchronous signal block of the measured service cell, and select the corresponding Preamble according to the random access opportunity (RACH-Ocction, RO for short) corresponding to the synchronous signal block, so as to initiate a random access flow. And then receives the RAR according to the reception characteristics of the synchronization signal block.
In NR, the transmission characteristics of the Beam, such as doppler shift, delay, etc., are characterized by a transmission configuration identity (Transmission Configuration Indicator, TCI), and the UE receives the RAR in a time window with the TCI of the Beam with the strongest signal strength, i.e. the UE considers the demodulation reference signal DMRS and the Beam with the strongest signal (different SSB indexes corresponding to different beams) to be gaussian coexisting (quasi co-location properties) when detecting the RAR.
In the NR R18 version, a random access procedure under a coverage enhancement scenario needs to be considered, and for performing random access by using multiple beams, a base station needs to combine and receive preambles sent by a UE for the multiple beams, where the UE may send the same Preamble or may send different preambles. If the base station does not implement the combined reception, the UE transmits different preambles for different beams; if the base station is to perform combining reception, the UE transmits the same Preamble. However, how to select the most suitable Beam by the base station for transmitting the Preamble for different beams, that is, how to transmit the RAR by the Beam with the strongest signal strength measured by the UE is a technical problem to be solved in the present day.
In addition, when the network device receives the Preamble sent by the UE by using a plurality of different beams, if the plurality of different beams are also used to send the RAR to the UE, the sent RAR may overlap in time domain, the UE simultaneously receives the RAR sent by different beams, which has high processing complexity requirement on the UE, and meanwhile, the network device sends the RAR by using a plurality of beams, which also causes waste of transmission resources, and sends the RAR by using a beam with poor signal condition, so that the probability of transmission failure is high.
In order to solve the above technical problems, an embodiment of the present application provides a random access method, in which, a UE sends, to a network device, a target preamble for each of a plurality of first beams, where the target preamble is a preamble corresponding to a target beam with strongest signal strength in the plurality of first beams; after receiving the target preamble, the network device can determine the target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam, and then can send RAR to the UE by using the target beam with the strongest signal strength. The following will explain in detail the embodiments.
Referring to fig. 3, fig. 3 is a flow chart of a random access method according to an embodiment of the present application. In some embodiments, the random access method may be applied in the UE.
Alternatively, the random access method may be performed by the UE, or may be performed by a chip or a specific module in the UE.
The random access method comprises the following steps:
s301, respectively sending target lead codes to network equipment for a plurality of first beams, wherein the target lead codes are lead codes corresponding to the target beams with the strongest signal strength in the plurality of first beams.
In some embodiments, one serving cell is typically made up of 4 BWP, where the initial BWP (Initial BWP) is Bandwidth Part 0, on which the UE in idle/inactive state camps, and the base station sends a system message (System Information, abbreviated SI), paging message, on the BWP. The SI generally indicates a random access resource applicable to the initial BWP, a Preamble available for random access (here, 64 preambles are assumed), a time-frequency location of random access, etc., and indicates a bandwidth (e.g., 20 MHz) of the initial BWP in the system message.
In some embodiments, a serving cell may have 16 beams (beams), beam index being Beam index 0-Beam index 15 (i.e., synchronization signal blocks SSB 0-SSB 15). The random access configuration indicates random access opportunities RO corresponding to different beans and preambles corresponding to different beans.
In some embodiments, the UE may pre-measure the signal strength of each beam in the serving cell where the UE currently camps, and select a first beam with a first signal strength rank from the plurality of beams when performing the random access procedure. The first beam ranked first may be the first several beams ranked strictly according to the signal strength of the beam measured by the UE, such as beam 1 with the strongest signal strength and beam 2 with the second strongest signal strength; the first beam of the UE with the highest rank may include beam 2 and beam 3, or the first beam with the highest rank may be beam 2, beam 3 and beam 5. It should be noted that, for one coverage class, the UE needs to know the number of transmission times of the corresponding Preamble, that is, the number of times that the UE needs to transmit for multiple beams; assuming that there are two coverage classes, the SSB received signal strength measured by the UE is at [ -104dbm to-108 dbm ] and needs to be transmitted 8 times, which corresponds to coverage class one; the UE measures that the SSB received signal strength is between-108 dbm and-112 dbm, and needs to transmit 16 times. Several coverage levels are specifically set, which may be set by the network device. The UE determines the coverage level of the UE according to the signal strength of the SSB measured by the UE and the RSRP of the SSB with the highest rank, and then carries out the random access flow according to the transmission times of the corresponding Preamble. When the UE performs random access for a plurality of beams, the UE determines a first beam from the top ranked (the strongest ones).
When the number of the first beams is a plurality of, determining a target beam with the strongest signal intensity from the plurality of first beams; and randomly selecting one of the preambles corresponding to the target beam as a target Preamble.
When random access is performed, the UE sending the target Preamble to the network device for each first beam respectively means that the UE sends the target Preamble to the network device at ROs corresponding to each first beam respectively.
S302, receiving a random access response sent by the network equipment.
In some embodiments, when receiving a target Preamble sent by a UE, a network device may determine, according to a preset correspondence between a Preamble and a beam, a target beam corresponding to the target Preamble.
After determining the target beam corresponding to the target preamble, the network device sends RAR to the UE by using the target beam.
In some embodiments, after the UE receives its own RAR accurately, the UE sends MSG3 according to the uplink transmission resources indicated in the RAR; and then, the UE receives the MSG4 sent by the network equipment, and after the MSG4 is successfully analyzed, the random access is successful.
Alternatively, MSG3 may be sent multiple times.
In some embodiments, the number of MSG3 transmissions may be indicated in the RAR.
In some embodiments, the UE may send MSG3 to the network device for each first beam, and receive MSG4 sent by the network device using the target beam. Alternatively, the UE may send MSG3 to the network device for the target beam and receive MSG4 sent by the network device using the target beam.
According to the random access method provided by the embodiment of the application, the UE respectively sends target lead codes to the network equipment aiming at a plurality of first wave beams, wherein the target lead codes are lead codes corresponding to the target wave beams with the strongest signal strength in the plurality of first wave beams; after receiving the target preamble, the network device can determine the target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam, and further can transmit RAR to UE by using the target beam with the strongest signal strength, thereby not only reducing the processing complexity of the UE and the network device, but also improving the success rate of random access
Based on the descriptions in the above embodiments, in some embodiments, the first beams may be the first beams of the serving cell where the UE currently camps, in order from strong to weak signal strength.
The random access method comprises the following steps:
Step 1, determining a first plurality (strongest first beams) of the service cell where the UE currently resides according to the signal strength ordered from strong to weak, and a target beam with strongest signal strength in the first beams; and selecting one preamble code from a plurality of preamble codes corresponding to the target beam as a target preamble code.
In some embodiments, the number of first beams may be configured by the network device.
And step 2, respectively transmitting target lead codes to the network equipment aiming at a plurality of first beams.
And step 3, receiving the random access response sent by the network equipment.
Alternatively, the UE may receive the random access response on the target beam or continuously receive the random access response on the target beam.
For example, assume that in a serving cell where the UE currently resides, the first 3 beams with signal strengths ordered from strong to weak are Beam index3, beam index4, and Beam index6, where Beam index4 is the Beam with the strongest signal strength of the 3 beams.
When the UE develops a random access flow for a plurality of beams, in order to enable the network equipment to acquire the strongest Beam where the UE is located from the preambles sent by the UE, the UE selects the Preamble corresponding to the Beam index4 where the UE is located. For example, the Preamble corresponding to the Beam index4 has 4 preambles, namely Preamble17, preamble18, preamble19 and Preamble20, and the UE can randomly select any one of the preambles. Assuming that the UE selects Preamble18, the UE transmits the Preamble18 on ROs corresponding to the 3 beams (Beam index3, beam index4, and Beam index 6) measured.
Alternatively, the UE may send the Preamble18 multiple times (e.g., 3 times on the ROs corresponding to Beam index3, beam index4, and Beam index6 each time), where the number of times of sending depends on the configuration of the system message, for example, the serving cell may set the number of times that needs to be sent according to the RSRP of the signal quality of the serving cell measured by the UE.
In some embodiments, the network device merges the preambles 18 sent by the UEs on ROs corresponding to Beam index3, beam index4, and Beam index 6.
Assuming that the network device accurately analyzes the Preamble18 sent by the UE, the network device can infer that the Preamble18 corresponds to the Beam index4 according to the corresponding relationship between the Beam index and the Preamble, so that the network device can determine that the strongest Beam where the UE is located is the Beam index4, and at this time, the network device can send a random access response to the UE on the Beam.
In some embodiments, after the UE has transmitted the Preamble18 multiple times, if the transmission ends in the time slot n, the UE may start receiving the random access response in the corresponding time slot, e.g., time slot n+3, as set in the system message.
In some embodiments, the UE receives the random access response according to TCI of Beam index4 according to the strongest Beam where the UE is located, and the UE may need to continuously receive the random access response multiple times to combine and parse to obtain the correct content. If the UE needs to receive the random access response in a plurality of continuous time slots and then combine the random access responses, the UE can successfully analyze the random access response. The number of consecutive receptions may be set by a system message, such as 8 consecutive RARs after slot n+3 after the end of the Preamble transmission in slot n.
Alternatively, the DMRS receiving the random access response and the target beam are gaussian coexisting (quasi co-location properties) when the UE receives the random access response.
In addition, the UE may calculate and obtain the RA-RANTI according to the Preamble18 (i.e., beam index 4) corresponding to the RO, and receive the random access response according to the RA-RNTI. And avoiding the confusion of receiving caused by different RA-RNTIs calculated by the RO corresponding to different beams when the UE receives the RAR.
The random access method provided by the embodiment of the application can fully utilize the existing random access configuration, so that the network equipment can identify the Beam with the strongest signal strength of the UE and then send the RAR at the Beam, thereby improving the success rate of RAR transmission.
Based on the descriptions in the foregoing embodiments, in some embodiments of the present application, there is further provided a random access method, applied to a network device, where the method includes:
step one, target lead codes sent by the UE aiming at a plurality of first beams are respectively received.
And step two, determining a target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam.
And step three, sending a random access response to the UE by using the target beam.
For a better understanding of the embodiments of the present application, referring to fig. 4, fig. 4 is a signaling diagram of a random access method provided in the embodiments of the present application.
In a possible implementation manner, the random access method includes:
the ue determines a first number of first beams in which the currently camping serving cell is ranked from strong to weak in signal strength, and a target beam with the strongest signal strength in the first beams.
The ue selects one preamble from a plurality of preambles corresponding to a target beam as a target preamble.
The ue transmits a target preamble to the network device for each of the plurality of first beams.
404. And the network equipment determines a target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam.
405. The network device transmits a random access response to the UE using the target beam.
According to the random access method provided by the embodiment of the application, the UE respectively sends target lead codes to the network equipment aiming at a plurality of first wave beams with the signal intensities ordered from strong to weak, wherein the target lead codes are lead codes corresponding to the target wave beam with the strongest signal intensity in the plurality of first wave beams; after receiving the target preamble, the network device can determine the target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam, and further can send RAR to the UE by using the target beam with the strongest signal strength, thereby not only reducing the processing complexity of the UE and the network device, but also improving the success rate of random access.
Based on the description in the foregoing embodiment, the embodiment of the present application also provides a random access device, which is applied to a user equipment. Referring to fig. 5, fig. 5 is a schematic program module of a random access device according to an embodiment of the present application, where the random access device 50 includes:
the sending module 501 is configured to send, to a network device, a target preamble for each of a plurality of first beams, where the target preamble is a preamble corresponding to a target beam with a strongest signal strength in the plurality of first beams.
A receiving module 502, configured to receive a random access response sent by the network device.
In one possible implementation, the receiving module 502 is configured to:
the random access response is received on the target beam or the random access response is received continuously on the target beam.
In a possible implementation manner, the plurality of first beams are the first beams of the serving cell where the UE currently camps, and the first beams are ordered from strong to weak in signal strength.
In a possible embodiment, the method further includes a determining module for:
determining a first plurality of first beams with the signal strength from strong to weak of a serving cell where the UE currently resides, and a target beam with the strongest signal strength in the first plurality of beams; and selecting one preamble code from a plurality of preamble codes corresponding to the target beam as the target preamble code.
In one possible implementation, the sending module 501 is specifically configured to:
according to the sending times of the target preamble, respectively sending the target preamble on the RO corresponding to each first wave beam; wherein the number of times of sending the target preamble is determined by the system message of the serving cell.
In one possible implementation, the DMRS receiving the random access response is gaussian coexisting with the target beam.
In one possible implementation, the receiving module 502 is specifically configured to:
determining an RA-RNTI according to the RO corresponding to the target beam; and receiving the random access response sent by the network equipment by utilizing the target beam according to the RA-RNTI.
It should be noted that, in the embodiment of the present application, the content specifically executed by the transmitting module 501 and the receiving module 502 is related to each step executed by the UE in the random access method described in the foregoing embodiment, and the content specifically described in the foregoing embodiment may be referred to, which is not repeated herein.
Based on the description in the foregoing embodiment, another random access device is further provided in the embodiment of the present application, and is applied to a network device. Referring to fig. 6, fig. 6 is a schematic program module of another random access apparatus according to an embodiment of the present application, where the random access 60 includes:
A receiving module 601, configured to receive target preambles sent by UEs for the plurality of first beams, respectively.
A determining module 602, configured to determine a target beam corresponding to the target preamble according to a correspondence between the preamble and the beam.
A sending module 603, configured to send a random access response to the UE using the target beam.
It should be noted that, in the embodiment of the present application, the content specifically executed by the receiving module 601, the determining module 602, and the sending module 603 is related to each step executed by the network device in the random access method described in the foregoing embodiment, and the content specifically described in the foregoing embodiment may be referred to, which is not repeated herein.
Further, based on the descriptions in the above embodiments, the embodiment of the present application further provides a user equipment, where the user equipment includes at least one processor and a memory; wherein the memory stores computer-executable instructions; the above-mentioned at least one processor executes the computer-executable instructions stored in the memory to implement the steps executed by the ue in the above-mentioned embodiment, which is not described herein again.
Further, based on the description in the foregoing embodiment, the embodiment of the present application further provides a network device, where the network device includes at least one processor and a memory; wherein the memory stores computer-executable instructions; the at least one processor executes the computer-executable instructions stored in the memory to implement the steps executed by the network device in the above embodiment, which is not described herein.
For better understanding of the embodiments of the present application, referring to fig. 7, fig. 7 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application. The electronic device may be the user device or the network device.
As shown in fig. 7, the electronic apparatus 70 of the present embodiment includes: a processor 701 and a memory 702; wherein:
a memory 702 for storing computer-executable instructions;
the processor 701 is configured to execute the computer-executable instructions stored in the memory, so as to implement the steps executed by the user equipment in the foregoing embodiment, and specifically, reference the relevant description in the foregoing method embodiment may be referred to.
Alternatively, the processor 701 is configured to execute the computer-executable instructions stored in the memory to implement the steps performed by the network device in the foregoing embodiment, and specifically, reference may be made to the description related to the foregoing method embodiment.
Alternatively, the memory 702 may be separate or integrated with the processor 701.
When the memory 702 is provided separately, the device further comprises a bus 703 for connecting said memory 702 to the processor 701.
Further, based on the description of the foregoing embodiment, the embodiment of the present application further provides a computer readable storage medium, where computer execution instructions are stored in the computer readable storage medium, and when the processor executes the computer execution instructions, the steps executed by the user equipment side in the foregoing embodiment are implemented.
Further, based on what is described in the foregoing embodiments, there is also provided a computer-readable storage medium having stored therein computer-executable instructions, which when executed by a processor, implement the steps performed by the network device side in the foregoing embodiments.
Further, based on the description in the foregoing embodiment, there is also provided a computer program product according to an embodiment of the present application, including a computer program, where the computer program when executed by a processor implements the steps performed by the user equipment side in the foregoing embodiment; or the steps performed by the network device side in the above embodiment.
It should be understood that in several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in the embodiments of the present application may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit. The units formed by the modules can be realized in a form of hardware or a form of hardware and software functional units.
The integrated modules, which are implemented in the form of software functional modules, may be stored in a computer readable storage medium. The software functional module 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, etc.) or a processor (english: processor) to perform some of the steps of the methods according to the embodiments of the application.
It should be understood that the above processor may be a central processing unit (english: central Processing Unit, abbreviated as CPU), or may be other general purpose processors, digital signal processors (english: digital Signal Processor, abbreviated as DSP), application specific integrated circuits (english: application Specific Integrated Circuit, abbreviated as ASIC), or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile memory NVM, such as at least one magnetic disk memory, and may also be a U-disk, a removable hard disk, a read-only memory, a magnetic disk or optical disk, etc.
The bus may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present application are not limited to only one bus or to one type of bus.
The storage medium may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (Application Specific Integrated Circuits, ASIC for short). It is also possible that the processor and the storage medium reside as discrete components in an electronic device or a master device.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (14)

1. A random access method, characterized in that it is applied in a user equipment UE, the method comprising:
transmitting target lead codes to network equipment respectively aiming at a plurality of first beams, wherein the target lead codes are lead codes corresponding to target beams with strongest signal strength in the plurality of first beams;
and receiving a random access response sent by the network equipment.
2. The method of claim 1, wherein the receiving the random access response sent by the network device comprises:
the random access response is received on the target beam or the random access response is received continuously on the target beam.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the plurality of first beams are the first beams of the service cell where the UE currently resides, wherein the first beams are ordered from strong to weak according to signal strength.
4. The method of claim 3, wherein before the transmitting the target preambles to the network device for the plurality of first beams, respectively, further comprises:
determining a first plurality of first beams with the signal strength from strong to weak of a serving cell where the UE currently resides, and a target beam with the strongest signal strength in the first plurality of beams;
and selecting one preamble code from a plurality of preamble codes corresponding to the target beam as the target preamble code.
5. A method according to claim 1 or 3, wherein said transmitting the target preamble to the network device for the plurality of first beams, respectively, comprises:
using the sending times of the target preamble, respectively sending the target preamble on the random access time RO corresponding to each first wave beam; wherein the number of times of sending the target preamble is determined by the system message of the serving cell.
6. The method of claim 1, wherein the demodulation reference signal, DMRS, that receives the random access response is gaussian coexisting with the target beam.
7. The method of claim 1, wherein the receiving the random access response sent by the network device comprises:
determining a random access radio network temporary identifier RA-RNTI according to the RO corresponding to the target beam;
and receiving the random access response sent by the network equipment according to the RA-RNTI.
8. A random access method, characterized in that it is applied in a network device, the method comprising:
respectively receiving target lead codes sent by User Equipment (UE) aiming at a plurality of first beams;
determining a target beam corresponding to the target preamble according to the corresponding relation between the preamble and the beam;
and sending a random access response to the UE by utilizing the target beam.
9. A random access apparatus for use in a user equipment UE, the apparatus comprising:
a sending module, configured to send target preambles to a network device for a plurality of first beams, where the target preambles are preambles corresponding to target beams with strongest signal strengths in the plurality of first beams;
and the receiving module is used for receiving the random access response sent by the network equipment.
10. A random access apparatus for use in a network device, the apparatus comprising:
A receiving module, configured to receive target preambles sent by a user equipment UE for a plurality of first beams respectively;
a determining module, configured to determine a target beam corresponding to the target preamble according to a correspondence between the preamble and the beam;
and the sending module is used for sending a random access response to the UE by utilizing the target beam.
11. A user device, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the random access method of any one of claims 1 to 7.
12. A network device, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored in the memory causes the at least one processor to perform the random access method of claim 8.
13. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor implement the random access method of any of claims 1 to 7;
Alternatively, the random access method of claim 8 is implemented when the processor executes the computer-executable instructions.
14. A computer program product comprising a computer program which, when executed by a processor, implements the random access method according to any one of claims 1 to 7 or implements the random access method according to claim 8.
CN202210392022.1A 2022-04-14 2022-04-14 Random access method and equipment Pending CN116981071A (en)

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