CN110312322B - Random access method and equipment for executing random access - Google Patents
Random access method and equipment for executing random access Download PDFInfo
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- CN110312322B CN110312322B CN201910471211.6A CN201910471211A CN110312322B CN 110312322 B CN110312322 B CN 110312322B CN 201910471211 A CN201910471211 A CN 201910471211A CN 110312322 B CN110312322 B CN 110312322B
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- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H04W74/00—Wireless channel access
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- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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Abstract
The application provides a random access method, which is characterized by comprising the following steps: receiving N synchronous signal blocks sent by network equipment, wherein N is an integer greater than 1; determining a first synchronous signal block from N synchronous signal blocks, wherein the first synchronous signal block is one of the N synchronous signal blocks, the receiving power of each synchronous signal block in the N synchronous signal blocks is larger than the receiving power of N-N synchronous signal blocks divided by the N synchronous signal blocks in the N synchronous signal blocks, and N is larger than N and is a positive integer; transmitting a first preamble using a first transmission beam corresponding to the first synchronization signal block using a first transmission power to perform a first random access; in case of failure of the first random access, the second preamble is transmitted using a first transmission beam using a second transmission power, to perform the second random access, the second transmission power being higher than the first transmission power. The probability of success of random access can be prevented from being increased due to the time delay introduced by re-selecting the wave beam and random access.
Description
Technical Field
The present invention relates to the field of communications, and more particularly, to a random access method and a device for performing random access.
Background
The terminal device may initiate a random access request to access the network. In a random access process, the terminal device receives a reference signal (the reference signal may be, for example, a synchronization signal block) sent by the network device, measures the reference signal, selects an optimal beam, and uses the optimal beam to send a random access request to the network device. If the random access fails, the terminal device will reinitiate the random access, i.e. re-receive the reference signal sent by the network device, perform reference signal measurement, beam selection, and send a random access request to the network device using a larger transmit power.
With the development of communication technology, the requirements of users on communication quality are higher and higher, and especially the requirements on information interaction time delay are higher and higher. Failure of random access will result in increased information interaction delay, so a scheme needs to be proposed to shorten the delay in the random access procedure.
Disclosure of Invention
The application provides a random access method and equipment for executing random access, and aims to shorten time delay in a random access process.
In a first aspect, a method for random access is provided, including: receiving N synchronous signal blocks sent by network equipment, wherein N is an integer greater than 1; determining a first synchronization signal block from the N synchronization signal blocks, wherein the first synchronization signal block is one of the N synchronization signal blocks, the receiving power of each synchronization signal block in the N synchronization signal blocks is larger than the receiving power of N-N synchronization signal blocks except the N synchronization signal blocks in the N synchronization signal blocks, and N is larger than N and N is a positive integer; transmitting a first preamble using a first transmission power using a first transmission beam corresponding to the first synchronization signal block to perform a first random access; and in case of failure of the first random access, transmitting a second preamble using a second transmission power using the first transmission beam to perform a second random access, the second transmission power being higher than the first transmission power.
The terminal device receives a plurality of synchronization signal blocks sent by the network device, each synchronization signal block corresponds to one beam, and the terminal device can measure the synchronization signal blocks to determine the optimal one or more receiving beams. The above mentioned beams may correspond to time resources and/or space resources and/or frequency domain resources. The beam may also correspond to a reference signal resource (e.g., a beamformed reference signal resource), or beamforming information. The beam may also correspond to information associated with reference signal resources of the network device. The beam may also correspond to spatial filters (spatial filters or spatial domain filter), spatial transmission filters (spatial domain transmission filter). In this application, the synchronization signal is taken as an example for illustration, and one of ordinary skill in the art can replace the synchronization signal block with other information corresponding to the beam according to the resource or information corresponding to the beam, for example, information related to the reference signal resource of the network device, beamforming information, reference signal resource index, spatial filter, spatial transmission filter, etc.
The terminal device may measure the received plurality of synchronization signal blocks to determine a beam satisfying the condition. The measurement of the synchronization signal block may include layer one reference signal received power (layer 1reference signal received power,L1-RSRP), layer one signal to interference and noise ratio (layer 1signal to interference plus noise ratio), and so on. Accordingly, the terminal device can determine a plurality of received powers, such as reference signal received powers (reference signal received power, RSRP), corresponding one-to-one to the plurality of synchronization signal blocks through the above measurement.
The reasons for the failure of the random access initiated by the terminal device may be: (1) The terminal device does not receive the RAR message (e.g., the RAR message is not detected on enough subframes); (2) The terminal device sends a scheduled transmission (scheduled transmission) message (generally denoted as random access signaling 3 (Msg 3) in the communication protocol) to the network device after receiving the RAR message, and the terminal device does not receive a collision resolution message corresponding to the scheduled transmission message (e.g., does not detect a collision resolution message on a sufficient number of subframes); (3) The terminal device receives the conflict resolution message, but the conflict resolution message indicates that the terminal device is not the winner of the conflict resolution.
Optionally, the second transmit power is a sum of the first transmit power and a power ramp step size.
Optionally, the second transmit power is a maximum transmit power.
In the embodiment of the present application, since the received power of the first synchronization signal block is relatively high, the first transmission beam is a relatively preferable transmission beam. Also, the factor causing the random access failure is not necessarily that the transmission beam selected by the terminal device is unsuitable, for example, that the terminal device receives the collision resolution message indicating that the terminal device is not the winner of the collision resolution. If the terminal device re-receives the synchronization signal block sent by the network device at this time, or re-selects a sending beam to initiate a random access request, the time delay consumed in the whole random access process is longer, which is not beneficial to user experience. Therefore, in the case of failure of the first random access, the terminal device can still use the first transmission beam determined before to continue to initiate the random access, so as to avoid unnecessary time delay introduced by re-selecting the beam and re-initiating the random access. In addition, the terminal device transmits the random access request using the second transmission power higher than the first transmission power, and the probability of success of the random access can be increased.
With reference to the first aspect, in certain implementations of the first aspect, before the transmitting the second preamble using the first transmission beam using the second transmission power, the method further includes: and ignoring the synchronous signal block sent by the network equipment.
Ignoring the synchronization signal block sent by the network device may be interpreted as not detecting, or skipping, or filtering out the synchronization signal block sent by the network device.
With reference to the first aspect, in some implementations of the first aspect, in a case where the second transmission power meets a preset condition and the second random access fails, the method further includes: determining a second synchronous signal block from the n synchronous signal blocks, wherein n is greater than 1; transmitting a third preamble at a third transmission power using a second transmission beam corresponding to the second synchronization signal block to perform a third random access; wherein the second transmission power satisfies a preset condition, including: the second transmission power reaches the maximum transmission power; or the power lifting times corresponding to the second sending power reach the maximum lifting times.
In the embodiment of the application, if the results of multiple random accesses initiated by using the same transmission beam are all failure, the terminal device can update the transmission beam in time, so that excessive time delay is avoided.
With reference to the first aspect, in certain implementations of the first aspect, the third transmission power is a maximum transmission power, or the third transmission power is determined by a reception power of the second synchronization signal block.
In the embodiment of the application, compared with a mode of transmitting the third preamble by using non-maximum transmission power, the probability of success of random access of the terminal equipment is definitely increased by using the maximum transmission power to transmit the third preamble, and unnecessary time delay caused by multiple climbing is avoided.
With reference to the first aspect, in certain implementation manners of the first aspect, before the determining the second synchronization signal block, the method further includes: storing a first synchronization signal block list, wherein the first synchronization signal block list comprises identification information of the n synchronization signal blocks; the determining a second synchronization signal block includes: and determining the second synchronous signal block according to the first synchronous signal block list.
Alternatively, the first synchronization signal block list may be understood as a white list of synchronization signal blocks.
In the embodiment of the application, n synchronization signal blocks determined by the terminal device belong to relatively better synchronization signal blocks, and the relatively better synchronization signal blocks are stored in the first synchronization signal block list, so that the terminal device can use the n synchronization signal blocks subsequently.
With reference to the first aspect, in certain implementation manners of the first aspect, the first synchronization signal block list further includes information indicating a random access sequence of the n synchronization signal blocks, where the information of the random access sequence of the n synchronization signal blocks includes an order of the n synchronization signal blocks from large to small in received power, or an order of the n synchronization signal blocks from small to large in beam angle.
In the embodiment of the present application, the first synchronization signal block list may further store ordering information of n synchronization signal blocks, so that the terminal device may use the n synchronization signal blocks according to a specific scenario or requirement and a relatively better order, thereby increasing probability of success of random access and avoiding introduction of unnecessary time delay.
With reference to the first aspect, in some implementations of the first aspect, the first synchronization signal block list further includes n1 synchronization signal blocks, a conflict solution corresponding to the n1 synchronization signal blocks is failure, and n1 is a positive integer.
In the embodiment of the present application, the conflict resolution message indicates that the terminal device is not the winner of the conflict resolution, meaning that the transmission beam used by the terminal device is the appropriate transmission beam, and that the conflict resolution failure is likely to be a random result. The terminal equipment can still use the sending beam corresponding to a certain synchronous signal block to continuously initiate random access, so that unnecessary time delay caused by re-selecting the beam and re-initiating the random access is avoided.
With reference to the first aspect, in certain implementation manners of the first aspect, the method further includes: storing a second synchronization signal block list, wherein the second synchronization signal block list comprises information of N2 synchronization signal blocks, any one of the N2 synchronization signal blocks meets a random access failure condition, and N2 is a positive integer less than or equal to N; the determining the second synchronization signal block according to the first synchronization signal block list includes: and according to the first synchronous signal block list and the second synchronous signal block list, excluding the n2 synchronous signal blocks from the n synchronous signal blocks, and determining the second synchronous signal block.
Alternatively, the second list of synchronization signal blocks may be understood as a blacklist of synchronization signal blocks.
In the embodiment of the application, the probability of success of random access can be increased without using a transmission beam with failure of random access, and unnecessary time delay is avoided.
With reference to the first aspect, in certain implementation manners of the first aspect, the random access failure condition is satisfied by any synchronization signal block, including: the number of times of sending the preamble corresponding to any synchronization signal block reaches a first preset threshold; or, performing random access corresponding to the arbitrary synchronization signal block using the maximum transmission power; or alternatively; the beam corresponding to any synchronization signal block is a fault beam.
With reference to the first aspect, in certain implementation manners of the first aspect, the method further includes: according to the obtained sensor data, determining that the target displacement is larger than a second preset threshold; detecting that the received power of the first synchronization signal block is first received power at a first moment, detecting that the received power of the first synchronization signal block is second received power at a second moment, and the second moment is after the first moment; receiving M synchronous signal blocks sent by the network equipment under the condition that the first receiving power is larger than the second receiving power; determining a third synchronization signal block from the M synchronization signal blocks, wherein the third synchronization signal block is one of M synchronization signal blocks, the receiving power of each synchronization signal block in the M synchronization signal blocks is larger than the receiving power of M-M synchronization signal blocks except the M synchronization signal blocks in the M synchronization signal blocks, and M > M and M, M are positive integers; transmitting a preamble by using a third transmission beam corresponding to the third synchronization signal block; and transmitting a preamble using the first transmission beam in case that the first reception power is smaller than the second reception power.
The sensor in the application may be a device for acquiring information such as displacement and position by the terminal device. The data detected by the sensor is the sensor data.
In the embodiment of the present application, when the first received power is greater than the second received power, the received power of the first synchronization signal block may be considered to decrease with time. At this time, the terminal device can update the transmission beam in time, avoid unnecessary delay caused by random access failure, and even avoid total random access times. When the first received power is smaller than the second received power, the transmission beam corresponding to the first synchronization signal block may be considered to be relatively preferable. The terminal equipment can continue to initiate random access by using the first sending beam corresponding to the first synchronous signal block without updating the sending beam, thereby avoiding unnecessary time delay caused by re-selecting the beam and re-initiating the random access.
In a second aspect, there is provided an apparatus for performing random access, comprising: the receiving module is used for receiving N synchronous signal blocks sent by the network equipment, wherein N is an integer greater than 1; the processing module is used for determining a first synchronous signal block from the N synchronous signal blocks, wherein the first synchronous signal block is one of the N synchronous signal blocks, the receiving power of each synchronous signal block in the N synchronous signal blocks is larger than the receiving power of N-N synchronous signal blocks divided by the N synchronous signal blocks in the N synchronous signal blocks, and N is a positive integer; a transmitting module, configured to transmit a first preamble using a first transmit power using a first transmit beam corresponding to the first synchronization signal block, so as to perform a first random access; the transmitting module is further configured to transmit a second preamble using a second transmit power using the first transmit beam to perform a second random access in case the first random access fails, the second transmit power being higher than the first transmit power.
Alternatively, the device performing random access of the second aspect may be a terminal device, or may be a component (e.g. a chip or a circuit, etc.) that may be used for the terminal device.
With reference to the second aspect, in some implementations of the second aspect, before the transmitting the second preamble using the first transmission beam using the second transmission power, the receiving module is further configured to ignore a synchronization signal block transmitted by the network device.
With reference to the second aspect, in some implementations of the second aspect, in a case that the second transmission power meets a preset condition and the second random access fails, the processing module is further configured to determine a second synchronization signal block from the n synchronization signal blocks, where n is greater than 1; the transmitting module is further configured to transmit a third preamble according to a third transmission power using a second transmission beam corresponding to the second synchronization signal block to perform a third random access; wherein the second transmission power satisfies a preset condition, including: the second transmission power reaches the maximum transmission power; or the power lifting times corresponding to the second sending power reach the maximum lifting times.
With reference to the second aspect, in some implementations of the second aspect, the third transmission power is a maximum transmission power, or the third transmission power is determined by a reception power of the second synchronization signal block.
With reference to the second aspect, in certain implementation manners of the second aspect, before the determining the second synchronization signal block, the processing module is further configured to store a first synchronization signal block list, where the first synchronization signal block list includes identification information of the n synchronization signal blocks; the processing module is specifically configured to determine the second synchronization signal block according to the first synchronization signal block list.
With reference to the second aspect, in certain implementations of the second aspect, the first synchronization signal block list further includes information indicating a random access order of the n synchronization signal blocks, where the information of the random access order of the n synchronization signal blocks includes an order of the n synchronization signal blocks from large to small in received power, or an order of the n synchronization signal blocks from small to large in beam angle.
With reference to the second aspect, in some implementations of the second aspect, the first synchronization signal block list further includes n1 synchronization signal blocks, where a collision resolution result corresponding to the n1 synchronization signal blocks is failure, and n1 is a positive integer.
With reference to the second aspect, in certain implementation manners of the second aspect, the processing module is further configured to store a second synchronization signal block list, where the second synchronization signal block list includes information of N2 synchronization signal blocks, where any one of the N2 synchronization signal blocks satisfies a random access failure condition, and N2 is a positive integer less than or equal to N; the processing module is specifically configured to exclude the n2 synchronization signal blocks from the n synchronization signal blocks according to the first synchronization signal block list and the second synchronization signal block list, and determine the second synchronization signal block.
With reference to the second aspect, in certain implementations of the second aspect, the random access failure condition is satisfied by any of the synchronization signal blocks, including: the number of times of sending the preamble corresponding to any synchronization signal block reaches a first preset threshold; or, performing random access corresponding to the arbitrary synchronization signal block using the maximum transmission power; or alternatively; the beam corresponding to any synchronization signal block is a fault beam.
With reference to the second aspect, in certain implementation manners of the second aspect, the processing module is further configured to determine, according to the obtained sensor data, that the target displacement is greater than a second preset threshold; the processing module is further configured to detect, at a first time, that a received power of the first synchronization signal block is a first received power, and detect, at a second time, that a received power of the first synchronization signal block is a second received power, where the second time is after the first time; the receiving module is further configured to receive M synchronization signal blocks sent by the network device when the first received power is greater than the second received power, and the processing module is further configured to determine a third synchronization signal block from the M synchronization signal blocks, where the third synchronization signal block is one of M synchronization signal blocks, and a received power of each of the M synchronization signal blocks is greater than a received power of M-M synchronization signal blocks of the M synchronization signal blocks divided by the M synchronization signal blocks, where M > M and M, M are positive integers; the transmitting module is further configured to transmit a preamble using a third transmit beam corresponding to the third synchronization signal block; the transmitting module is further configured to transmit a preamble using the first transmit beam if the first receive power is less than the second receive power.
In a third aspect, embodiments of the present application provide a communication apparatus comprising means for performing the first aspect or any one of the possible implementations of the first aspect.
Alternatively, the communication apparatus of the third aspect may be a terminal device, or may be a component (e.g. a chip or a circuit, etc.) usable with a terminal device.
In a fourth aspect, embodiments of the present application provide a storage medium storing instructions for implementing the method of the first aspect or any one of the possible implementations of the first aspect.
In a fifth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect or any one of the possible implementations of the first aspect.
In a sixth aspect, the present application provides a communication apparatus comprising at least one processor and a communication interface for information interaction by the communication apparatus with other communication apparatuses, which when executed in the at least one processor causes the communication apparatus to implement a function on the sender device in a method according to the first aspect or any one of the possible implementations of the first aspect.
In a seventh aspect, the present application provides a chip system, wherein the chip system includes at least one processor, and wherein program instructions, when executed in the at least one processor, cause a function on the sender device to be implemented in a method according to the first aspect or any one of the possible implementations of the first aspect.
Drawings
Fig. 1 is a schematic diagram of a beam training in an embodiment of the present application.
Fig. 2 is a schematic view of a communication system to which the embodiments of the present application are applicable.
Fig. 3 is a schematic flow chart of a method of random access according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present application.
Detailed Description
The technical solutions in the present application will be described below with reference to the accompanying drawings.
The terminology involved in this application is described in detail below:
beam (beam):
a beam is a communication resource. The beam may be a wide beam, or a narrow beam, or other type of beam. The technique of forming the beam may be a beam forming technique or other means of technique. The beamforming technique may be embodied as a digital beamforming technique, an analog beamforming technique, a hybrid digital/analog beamforming technique. Different beams may be considered different resources. Alternatively, a plurality of beams having the same or similar communication characteristics may be regarded as one beam. The transmit beam may refer to a distribution of signal strengths formed in spatially different directions after signals are transmitted through the antennas, and the receive beam may refer to a distribution of signal strengths of wireless signals received from the antennas in spatially different directions. The beam may be embodied in a protocol as spatial filters, spatially dependent parameters. In this application, the beam may also be replaced by a direction, a spatial resource, a precoding vector with energy transmission directivity (or energy transmission directivity). The signal after the precoding vector is precoded is received in a certain space position, so that the requirement of the receiving power, such as the receiving demodulation signal-to-noise ratio, can be met. The precoding vector is used to receive a plurality of identical signals transmitted from different spatial locations, the plurality of identical signals corresponding to different received powers.
The beams may be divided into a transmission beam and a reception beam of the network device and a transmission beam and a reception beam of the terminal device. The transmit beam of the network device is used to describe the network device transmit side beamforming information, and the receive beam of the network device is used to describe the network device receive side beamforming information. The transmit beam of the terminal device is used to describe the beamforming information on the transmit side of the terminal device, and the receive beam of the terminal device is used to describe the beamforming information on the receive side of the terminal device. The transmit beam of the network device (also referred to as a downlink transmit beam) and the receive beam of the terminal device may form a pair of Beam Pair Links (BPLs); the receive beam of the network device and the transmit beam of the terminal device (also referred to as an uplink transmit beam) may form a pair of BPLs. As shown in fig. 1, the transmission beams of the network device include beam 1, beam 2, beam 3, and beam 4, and the reception beams of the terminal device include beam 5, beam 6, and beam 7. When the network device uses beam 3 for downlink transmission (i.e., beam 3 is a downlink transmission beam), the terminal device may determine beam 6 as the corresponding reception beam, and beam 3 and beam 6 may form a pair of BPLs. Further, when the beam of the network device satisfies the beam correspondence (beam correspondence) feature, the reception beam of the network device may be determined from the transmission beam of the network device or the transmission beam of the network device may be determined from the reception beam of the network device. Similarly, when the beam of the terminal device satisfies the beam correspondence (beam correspondence) feature, the reception beam of the terminal device may be determined from the transmission beam of the terminal device, or the transmission beam of the terminal device may be determined from the reception beam of the terminal device. Such beam correspondence characteristics are sometimes also referred to as the ability to transmit/receive beam uniformity.
The beams may correspond to time resources and/or space resources and/or frequency domain resources. The beam may also correspond to a reference signal resource (e.g., a beamformed reference signal resource), or beamforming information. The beam may also correspond to information associated with reference signal resources of the network device. The beam may also correspond to spatial filters (spatial filters or spatial domain filter), spatial transmission filters (spatial domain transmission filter). The reference signal may be a channel state information reference signal (channel state information reference signal, CSI-RS), a synchronization signal broadcast channel block (synchronous signal/PBCH block, SSB), a demodulation reference signal (demodulation reference signal, DMRS), a phase tracking signal (phase tracking reference signal, PTRS) tracking signal (tracking reference signal, TRS), etc., and the information associated with the reference signal resource may be a reference signal resource identifier, or quasi co-location (QCL) information (especially type D QCL), etc. The identification of the reference signal resource corresponds to a receiving-transmitting beam pair established when the reference signal resource is measured, and the terminal can infer beam information through the identification of the reference signal resource. The present application uses a synchronization signal block as an example, and describes a beam training process or a random access process by describing processes of receiving, demodulating, processing, etc. the synchronization signal block by a terminal device. It should be understood that the terminal device may process other reference signals in addition to the synchronization signal block to perform beam training or random access, or may process reference signal resource association information and the like to perform beam training or random access.
Beamforming technique (beamforming):
beamforming techniques may achieve higher antenna array gain by spatially orienting a particular direction. Analog beamforming may be implemented by radio frequency. For example, a radio frequency link (RF chain) adjusts the phase through a phase shifter to control the change in the direction of the analog beam. Thus, an RF chain can only fire one analog beam at a time.
Beam indication information:
for indicating the beam used for transmission, including the transmit beam and/or the receive beam. The method comprises the steps of including at least one of a beam number, a beam management resource number, an uplink signal resource number, a downlink signal resource number, an absolute index of a beam, a relative index of a beam, a logical index of a beam, an index of an antenna port corresponding to a beam, an antenna port group index corresponding to a beam, an index of a downlink signal corresponding to a beam, a time index of a downlink synchronization signal block corresponding to a beam, beam Pair Link (BPL) information, a transmission parameter (Tx parameter) corresponding to a beam, a reception parameter (Rx parameter) corresponding to a beam, a transmission weight corresponding to a beam, a weight matrix corresponding to a beam, a weight vector corresponding to a beam, a reception weight corresponding to a beam, an index of a transmission weight corresponding to a beam, a weight matrix corresponding to a beam, an index of a reception weight corresponding to a beam, a reception codebook corresponding to a beam, a transmission codebook corresponding to a beam, an index of a transmission codebook corresponding to a beam, a downlink signal including a synchronization signal, a broadcast channel, a broadcast signal demodulation signal, a channel state information downlink signal (channel state information reference signal), a special demodulation signal (RS-channel state information reference signal), a downlink signal (reference signal, a downlink signal 35-35), a downlink signal, and a special-channel-demodulation signal. The uplink signal comprises any one of an uplink random access sequence, an uplink sounding reference signal, an uplink control channel demodulation reference signal, an uplink data channel demodulation reference signal and an uplink phase noise tracking signal.
Spatially dependent parameters:
the spatial correlation parameter may also be referred to as a spatial correlation characteristic. The spatially-dependent parameters include one or more of the following: angle of arrival (AoA), main (domino) angle of incidence AoA, average angle of incidence, power angle spectrum of incidence (power angular spectrum, PAS), exit angle (angle of departure, aoD), main exit angle, average exit angle, power angle spectrum of exit angle, terminal device transmit beamforming, terminal device receive beamforming, spatial channel correlation, network device transmit beamforming, network device receive beamforming, average channel gain, average channel delay (average delay), delay spread (delay spread), doppler spread (Doppler shift), spatial receive parameters (spatial Rx parameters), and the like. These spatially-dependent parameters describe the spatial channel characteristics between the antenna ports of the source reference signal and the target reference signal, which facilitate the terminal device to perform a transmit side (or receive side) beamforming or transmit (or receive) process according to the spatially-dependent parameter information.
Beam management resources:
refers to resources for beam management and may be embodied as resources for calculating and measuring beam quality. The beam quality includes layer one received reference signal power (layer 1reference signal received power,L1-RSRP), layer one received reference signal quality (layer 1reference signal received quality,L1-RSRQ), and so on. Specifically, the beam management resource may include a synchronization signal, a broadcast channel, a downlink channel measurement reference signal, a tracking signal, a downlink control channel demodulation reference signal, a downlink shared channel demodulation reference signal, an uplink sounding reference signal, an uplink random access signal, and the like.
It should be noted that, as the technology is continuously developed, the terms of the embodiments of the present application may be changed, but all the terms are within the protection scope of the present application.
The technical solution of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (global system for mobile communications, GSM), code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication system, future fifth generation (5th generation,5G) system, or New Radio (NR), etc.
The terminal device in the embodiments of the present application may refer to a user device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user apparatus. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a relay device, an in-vehicle 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 the embodiments of the application are not limited in this respect.
The network device in this embodiment of the present application may be a device for communicating with a terminal, which may be a base station (base transceiver station, BTS) in a global system for mobile communications (global system for mobile communications, GSM) or code division multiple access (code division multiple access, CDMA), a base station (NodeB, NB) in a wideband code division multiple access (wideband code division multiple access, WCDMA) system, an evolved NodeB (eNB or eNodeB) in an LTE system, a wireless controller in a cloud wireless access network (cloud radio access network, CRAN) scenario, or a relay device, an access point, a vehicle device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, one or a group (including a plurality of antenna panels) of base stations in a 5G system, or a network node that forms a gNB or a transmission point, such as a baseband unit (BBU), or a Distributed Unit (DU), or the embodiment of the present application is not limited.
In some deployments, the gNB may include a Centralized Unit (CU) and DUs. The gNB may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB. For example, the CU is responsible for handling non-real time protocols and services, implementing the functions of the radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.
In the embodiment of the application, the terminal device or the network device includes a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided in the embodiment of the present application, as long as the communication can be performed by the method provided in the embodiment of the present application by running the program recorded with the code of the method provided in the embodiment of the present application, and for example, the execution body of the method provided in the embodiment of the present application may be a terminal device network device, or a functional module in the terminal device or the network device capable of calling the program and executing the program.
Furthermore, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein encompasses a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include, but are not limited to, magnetic storage devices (e.g., hard disk, floppy disk, or magnetic strips, etc.), optical disks (e.g., compact disk, CD, digital versatile disk, digital versatile disc, DVD, etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory, EPROM), cards, sticks, or key drives, etc. Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.
Fig. 2 is a schematic diagram of a communication system of the present application. The communication system in fig. 2 may comprise at least one terminal device (e.g. terminal device 1, terminal device 2) and a network device. The network device is used for providing communication service for the terminal device and accessing the core network, and the terminal device can access the network by searching for synchronous signals, broadcast signals and the like sent by the network device, so as to perform communication with the network. The terminal device 1 in fig. 2 establishes a link 1 with a network device, and the terminal device 1 may perform uplink and downlink transmission with the network device. For example, the network device may transmit a downlink signal to the terminal device 1, or may receive an uplink signal transmitted by the terminal device 1.
In addition, the communication system in fig. 2 may further include a relay device. The network device can provide communication service for the relay device and access the core network, and the relay device can access the network by searching for the synchronous signals, broadcast signals and the like sent by the network device, thereby realizing network communication. The relay device in fig. 2 establishes a link 2 with the network device, and the relay device may send a downlink signal to the relay device, or may receive an uplink signal sent by the relay device. In this case, the relay device can be regarded as a kind of terminal device with respect to the network device.
In addition, the terminal and the relay apparatus can also be regarded as one communication system. The relay device in fig. 2 establishes a link 3 with the terminal device 2, and the relay device may send a downlink signal to the terminal device 2, or may receive an uplink signal sent by the terminal device 2. In this case, the relay device can be regarded as a network device with respect to the terminal device.
It should be appreciated that the network devices included in the communication system may be one or more. A network device may send data or control signaling to one or more terminal devices. Multiple network devices may also send data or control signaling to one or more terminal devices simultaneously.
Fig. 3 is a schematic flow chart of a method of random access provided in the present application.
The terminal device receives N synchronization signal blocks sent by the network device, where N is an integer greater than 1.
Accordingly, the network device transmits the N synchronization signal blocks.
The network device sends N synchronization signal blocks, which may be broadcast or multicast by the network device. Or the network device sends the N synchronization signal blocks to the terminal device, i.e. the network device unicasts the N synchronization signal blocks to the terminal device.
The network device may transmit N synchronization signal blocks on multiple beams. For example, the network device transmits the N synchronization signal blocks using N beams, where each of the N beams is used to transmit one synchronization signal block.
The terminal device receives a plurality of synchronization signal blocks sent by the network device, each synchronization signal block corresponds to one beam, and the terminal device can measure the synchronization signal blocks to determine the optimal one or more receiving beams. The above mentioned beams may correspond to time resources and/or space resources and/or frequency domain resources. The beam may also correspond to a reference signal resource (e.g., a beamformed reference signal resource), or beamforming information. The beam may also correspond to information associated with reference signal resources of the network device. The beam may also correspond to spatial filters (spatial filters or spatial domain filter), spatial transmission filters (spatial domain transmission filter). In this application, the synchronization signal block is taken as an example for illustration, and one of ordinary skill in the art can replace the synchronization signal block with other information corresponding to the beam according to the resource or information corresponding to the beam, for example, information related to the reference signal resource of the network device, beamforming information, reference signal resource index, spatial filter, spatial transmission filter, etc.
For example, the terminal device may be a resource index identifier that receives N synchronization signal blocks.
As another example, the terminal device may receive N channel state information reference signals (channel state information reference signal, CSI-RS).
302, determining a first synchronization signal block from the N synchronization signal blocks, wherein the first synchronization signal block is one of N synchronization signal blocks, the receiving power of each synchronization signal block of the N synchronization signal blocks is greater than the receiving power of N-N synchronization signal blocks divided by the N synchronization signal blocks of the N synchronization signal blocks, and N > N and N are positive integers.
The terminal device may measure the received plurality of synchronization signal blocks to determine a beam satisfying the condition. The measurement of the synchronization signal block may include layer one reference signal received power (layer 1reference signal received power,L1-RSRP), layer one signal to interference and noise ratio (layer 1signal to interference plus noise ratio), and so on. Accordingly, the terminal device can determine a plurality of received powers, such as reference signal received powers (reference signal received power, RSRP), corresponding one-to-one to the plurality of synchronization signal blocks through the above measurement.
Then, the terminal device may select n received powers with the largest received power values from the plurality of received powers, i.e. determine n synchronization signal blocks corresponding to the n received powers one to one.
The first synchronization signal block may be one of the n synchronization signal blocks, for example, the first synchronization signal block is a synchronization signal block having the largest reception power value among the n synchronization signal blocks. When n=1, the received power of the first synchronization signal block is the largest among the N synchronization signal blocks.
303, transmitting a first preamble using a first transmission beam corresponding to the first synchronization signal block and using a first transmission power, so as to perform a first random access.
The received power of the first synchronization signal block is larger, and the beam corresponding to the first synchronization signal block is relatively better. Accordingly, the terminal device determines the first synchronization signal block, which can be regarded as the terminal device selecting the reception beam of the terminal device and the transmission beam of the network device corresponding to the reception beam.
If the beam of the terminal device satisfies the beam correspondence (beam correspondence) feature (sometimes also referred to as channel diversity), or if the terminal device has the capability of transmitting/receiving beam consistency, the terminal device may determine the transmitting beam and the receiving beam of the terminal device according to the first synchronization signal block. After determining the reception beam of the terminal device corresponding to the first synchronization signal block, the terminal device may determine the transmission beam of the terminal device in a spatial direction of the reception beam.
After determining that the terminal device transmits the beam, the terminal device transmits a random access request using the first transmission power, that is, transmits a first preamble to the network device using the first transmission power and the first transmission beam.
In general, after the terminal device receives the synchronization signal block and measures the synchronization signal block, the terminal device may determine a transmission power at which to transmit the first preamble.
In one example, the first transmit power may be a preset transmit power, such as a preset minimum transmit power. The preset transmission power may be a transmission power specified in a communication protocol, or may be a transmission power agreed by the network device and the terminal device.
In one example, the terminal device may determine the first transmit power based on the received power of the first synchronization signal block. The terminal device can estimate a proper transmitting power according to the receiving power of the first synchronous signal block, thereby avoiding unnecessary energy loss caused by overhigh transmitting power and also avoiding increasing the probability of random access failure caused by overhigh generating power.
304, in case the first random access fails, transmitting a second preamble using the first transmission beam using a second transmission power, to perform a second random access, the second transmission power being higher than the first transmission power.
If the first random access is successful, the terminal device may receive a response message sent by the network device and corresponding to the first synchronization signal block, where the response message may be, for example, a random access response (random access response, RAR) message (RAR message is sometimes also referred to as random access signaling 2, msg 2), or a collision resolution message (contention resolution) (generally denoted as random access signaling 4 (Msg 4) in the communication protocol), where the collision resolution message indicates that the terminal device is the winner of the collision resolution. Thus, the reasons for failure of the random access initiated by the terminal device may be: (1) The terminal device does not receive the RAR message (e.g., the RAR message is not detected on enough subframes); (2) The terminal device sends a scheduled transmission (scheduled transmission) message (generally denoted as random access signaling 3 (Msg 3) in the communication protocol) to the network device after receiving the RAR message, and the terminal device does not receive a collision resolution message corresponding to the scheduled transmission message (e.g., does not detect a collision resolution message on a sufficient number of subframes); (3) The terminal device receives the conflict resolution message, but the conflict resolution message indicates that the terminal device is not the winner of the conflict resolution.
In case of failure of the first random access, the terminal device may again send a random access request, e.g. a preamble, to the network device. Wherein the first transmit beam is a relatively preferred transmit beam because the received power of the first synchronization signal block is relatively high. Also, the factor causing the random access failure is not necessarily that the transmission beam selected by the terminal device is unsuitable, for example, that the terminal device receives the collision resolution message indicating that the terminal device is not the winner of the collision resolution. If the terminal device re-receives the synchronization signal block sent by the network device at this time, or re-selects a sending beam to initiate a random access request, the time delay consumed in the whole random access process is longer, which is not beneficial to user experience. Thus, in case of failure of the first random access, the terminal device may still continue to initiate random access using the previously determined first transmission beam. In addition, the terminal device transmits the random access request using the second transmission power higher than the first transmission power, and the probability of success of the random access can be increased. For example, in the case that the first transmission power selection is not suitable, the random access is restarted by using the second transmission power larger than the first transmission power, which is beneficial to increasing the probability of random access achievement.
The terminal device may determine the second transmit power by means of a power boost (also referred to as power ramp-up). Power ramping refers to signaling using a higher transmit power than before. And the power ramp step (power ramping step) refers to the difference between the current transmit power and the last transmit power. For example, the first transmission power is 10W, the second transmission power is 15W, and then the power ramp step is 5W. The power ramp step size may be pre-agreed. For example, the network device and the terminal device may agree on a power ramp step size in advance. The power ramp step size may also be indicated by the network device. The power ramp step size may also be determined by the terminal device itself. The specific manner of determining the power ramp step is not limited in this application.
The second transmit power may also be the maximum transmit power. I.e. in case the first random access fails, the terminal device initiates the random access again using the maximum transmit power and using the first transmit beam.
If the transmission power is gradually increased using a ramp-up method, the difference between the second transmission power and the first transmission power is small. In some cases where the first transmission power is relatively suitable, for example, in the case where the random access fails due to the failure of collision resolution, the terminal device may reinitiate the random access using the suitable transmission power, so as to avoid excessive loss of energy consumption.
If the second transmitting power is the maximum transmitting power, the probability of success of random access of the terminal equipment is certainly increased, and unnecessary time delay caused by multiple climbing is avoided.
Optionally, the terminal device ignores the synchronization signal block sent by the network device before sending the second preamble using the second transmission power using the first transmission beam.
That is, after the first random access fails, the terminal device does not detect, skip, or filter out the synchronization signal block sent by the network device, and does not redefine the new transmission beam, and still uses the first transmission beam to initiate random access.
The terminal device may initiate random access multiple times using the first transmit beam. For example, the terminal device may use a transmission power of 10W and initiate a first random access using a first transmission beam, if the first random access fails, the terminal device may superimpose a power ramp step (e.g., 5W) on the basis of the transmission power of 10W, use a transmission power of 15W and initiate a second random access using the first transmission beam, and if the second random access still fails, the terminal device may superimpose a power ramp step (e.g., 5W) on the basis of the transmission power of 15W, use a transmission power of 20W and use the first transmission beam. Until the second transmission power meets the preset condition, the terminal device will not initiate random access by using the first transmission beam any more, but determines a second transmission beam different from the first transmission beam, and initiates random access again by using the second transmission beam.
The second transmission power meets the preset condition, and may be that the second transmission power exceeds the first preset threshold, or the number of times of power boost (climbing) corresponding to the second transmission power exceeds the second preset threshold, or the number of times of random access corresponding to the second transmission power exceeds the third preset threshold (that is, the number of times of initiating random access using the same transmission beam reaches the third preset threshold). The first preset threshold may be the same or similar value as the maximum transmission power. The second preset threshold may be the same or similar value as the maximum number of lifts. The third preset threshold may be the same or similar value as the maximum number of random accesses.
In one example, the terminal device may re-receive the synchronization signal blocks transmitted by the network device and determine a second synchronization signal block from among the synchronization signal blocks satisfying the condition to determine the second transmission beam. In this example, the manner in which the terminal device determines the second synchronization signal block is similar to the manner in which the terminal device determines the first synchronization signal block, and reference may be made to steps 301 and 302 in the embodiment shown in fig. 3, which are not described in detail herein.
Optionally, in the case that the second transmission power meets a preset condition and the second random access fails, the method further includes: determining a second synchronous signal block from the n synchronous signal blocks, wherein n is greater than 1; transmitting a third preamble at a third transmission power using a second transmission beam corresponding to the second synchronization signal block to perform a third random access; wherein the second transmission power satisfies a preset condition, including: the second transmission power reaches the maximum transmission power; or the power lifting times corresponding to the second sending power reach the maximum lifting times.
That is, the terminal device determines N synchronization signal blocks, of which the reception power is largest among the N synchronization signal blocks, before initiating random access using the first transmission beam, and thus the N synchronization signal blocks are relatively superior. The terminal device may select a second synchronization signal block from the n synchronization signal blocks, and initiate a third random access using a second transmission beam corresponding to the second synchronization signal block. The manner of initiating the third random access using the second transmission beam is similar to the manner of initiating the first random access using the first transmission beam, and reference may be made to step 303 in the embodiment shown in fig. 3, which is not repeated here.
The third transmission power may be a predetermined power value, or may be a power value estimated by the terminal device.
In one example, the terminal device and the network device may agree with the terminal device to update the transmit power. The updated transmission power refers to a power value used by the terminal device in the process of the first random access initiated by using the updated transmission beam. The first transmission beam is updated to a second transmission beam, the second transmission beam is the updated transmission beam, and the power used by the terminal device in the first random access process initiated by using the second transmission beam is the third transmission power, so that the terminal device can determine a specific value of the third transmission power according to the agreed updated transmission power.
In one example, the terminal device may estimate the third transmit power from the received power of the second synchronization signal block.
In case the third transmission power is not the maximum transmission power, if the third random access fails, the random access may be initiated using the second transmission beam and using a fourth transmission power larger than the third transmission power in a power ramp-up manner.
Optionally, the third transmission power is a maximum transmission power, or the third transmission power is determined by the reception power of the second synchronization signal block.
That is, the terminal device initiates random access update from using the first transmission beam to using the second transmission beam, and the terminal device transmits a random access request using the maximum transmission power when initiating random access using the second transmission beam for the first time. Therefore, compared with a mode of transmitting the third preamble by using non-maximum transmission power, the probability of success of random access of the terminal equipment is certainly increased by using the maximum transmission power to transmit the third preamble, and unnecessary time delay caused by multiple climbing is avoided.
Optionally, before the determining the second synchronization signal block, the method further includes: storing a first synchronization signal block list, wherein the first synchronization signal block list comprises information of the n synchronization signal blocks; the determining a second synchronization signal block includes: and determining the second synchronous signal block according to the first synchronous signal block list.
The information of the n synchronization signal blocks is, for example, an index identifier of the synchronization signal block, or an index identifier of a resource where the synchronization signal block is located, or other identification information corresponding to the synchronization signal block, which is not limited in this application.
In other words, the terminal device determines N synchronization signal blocks, of which the reception power is maximum, before initiating random access using the first transmission beam, and thus the N synchronization signal blocks are relatively superior. The terminal device stores the n synchronization signal blocks in a first synchronization signal block list, so that the terminal device can use the n synchronization signal blocks later. The first list of synchronization signal blocks may be understood as a white list of synchronization signal blocks, i.e. any synchronization signal block in the first list of synchronization signal blocks may be used for initiating random access. When the terminal device updates the transmission beam (i.e. updates from the first transmission beam to the second transmission beam), the terminal device may select the second synchronization signal block from the n synchronization signal blocks according to the information stored in the first synchronization signal block list. Wherein the terminal device may take one synchronization signal block from any one of the first synchronization signal block list as the second synchronization signal block.
Optionally, the first synchronization signal block list further includes information indicating a random access order of the n synchronization signal blocks, where the random access order of the n synchronization signal blocks corresponds to an order of from large to small of received power of the n synchronization signal blocks or an order of from small to large of beam angles of the n synchronization signal blocks.
That is, the first synchronization signal block list includes identification information of the n synchronization signal blocks, and further includes information indicating random access order of the n synchronization signal blocks. The terminal device may determine the second synchronization signal block according to the indication information.
The information indicating the random access order of the n synchronization signal blocks may be information directly indicating the random access order of the n synchronization signal blocks, for example, synchronization signal block 1 is arranged in random access order 5. The information indicating the random access order of the n synchronization signal blocks may be information indirectly indicating the random access order of the n synchronization signal blocks. For example, the first synchronization signal block list stores the arrangement sequence of the n synchronization signal blocks, and the arrangement sequence of the n synchronization signal blocks is arranged according to the beam angle from large to small; the terminal device may determine, according to the arrangement order of the n synchronization signal blocks and the beam angle of the first transmission beam, that the transmission beam having a smaller beam angle difference from the first transmission beam is the second transmission beam, and may not necessarily initiate random access according to the arrangement order of the n synchronization signal blocks.
In one example, the n synchronization signal blocks are arranged in order of from high to low in received power, so that the terminal device may preferentially use the transmission beam corresponding to the synchronization signal block arranged in front, that is, the terminal device may preferentially use the transmission beam corresponding to the synchronization signal block having a relatively high probability of success in random access. For example, if the arrangement position of the first synchronization signal block is 3 rd, it may be determined that the synchronization signal block whose arrangement position is 4 th is the second synchronization signal block.
In one example, the n synchronization signal blocks are arranged in order of decreasing beam angle, and then the terminal device may determine, from the n synchronization signal blocks, a second synchronization signal block according to the beam angle of the first transmission beam, where the beam angle of the transmission beam corresponding to the second synchronization signal block is similar to the beam angle of the first transmission beam. For example, the beam angle of the first synchronization signal block is 45 °, and if the arrangement position of the first synchronization signal block list is 3 rd, it may be determined that the synchronization signal block whose arrangement position is 2 nd or whose arrangement position is 4 th is the second synchronization signal block. Further, if the beam angle of the synchronization signal block of the arrangement position 2 is 44 °, and the beam angle of the synchronization signal block of the arrangement position 4 is 47 °, it can be determined that the synchronization signal block of the arrangement position 2 is the second synchronization signal block.
The random access sequence of the n synchronization signal blocks may be implicitly indicated, or may be indicated in a display manner.
In one example, in the first synchronization signal block list, the storage order or the reading order of the n synchronization signal blocks is the arrangement order of the n synchronization signal blocks.
For example, the index value of the first synchronization signal block is 13, the index value of the second synchronization signal block is 20, the index value of the third synchronization signal block is 5, the reception power of the first synchronization signal block is greater than the reception power of the second synchronization signal block, and the reception power of the second synchronization signal block is greater than the reception power of the third synchronization signal block, then the first synchronization signal block list may store a sequence of 13, 20, 5, or a sequence of 5, 20, 13, and the terminal device reads the sequence in sequence when reading the sequence, so as to obtain the random access sequence of the n synchronization signal blocks.
In one example, the first synchronization signal block list stores identifications of the n synchronization signal blocks and random access sequences of the n synchronization signal blocks.
For example, the index value of the first synchronization signal block is 13, the index value of the second synchronization signal block is 20, and the index value of the third synchronization signal block is 5; the received power of the first synchronization signal block is greater than the received power of the second synchronization signal block, and the received power of the second synchronization signal block is greater than the received power of the third synchronization signal block. The first list of synchronization signal blocks may store a table (as shown in table 1), a first column of which may store index values of the synchronization signal blocks, and a second column of which may store random access sequences of the synchronization signal blocks, wherein the index values and the random access sequences of the same row correspond to the same synchronization signal blocks.
Table 1 one example of a first synchronization signal block list
| 20 | 2 |
| 13 | 1 |
| 5 | 3 |
For another example, the index value of the first synchronization signal block is 13, the index value of the second synchronization signal block is 20, and the index value of the third synchronization signal block is 5; the reception power of the first synchronization signal block is 15W, the reception power of the second synchronization signal block is 10W, and the reception power of the third synchronization signal block is 5W. The first synchronization signal block list may store a table (as shown in table 2), a first column of which may store index values of the synchronization signal blocks, and a second column of which may store reception powers of the synchronization signal blocks, wherein the index values and the reception powers of the same row correspond to the same synchronization signal block.
Table 2 one example of a first synchronization signal block list
| 20 | 10 |
| 13 | 15 |
| 5 | 5 |
For another example, the index value of the first synchronization signal block is 13, the index value of the second synchronization signal block is 20, and the index value of the third synchronization signal block is 5; the beam angle of the first synchronization signal block is 45 °, the beam angle of the second synchronization signal block is 44 °, and the beam angle of the third synchronization signal block is 47 °. The first list of synchronization signal blocks may store a table (as shown in table 3) in which a first column of the table may store index values of the synchronization signal blocks and a second column of the table may store beam angles of the synchronization signal blocks, wherein the index values and the beam angles of the same row correspond to the same synchronization signal block.
Table 3 one example of a first synchronization signal block list
| 20 | 45° |
| 13 | 44° |
| 5 | 47° |
Optionally, the first synchronization signal block list further includes n1 synchronization signal blocks, the conflict resolution result corresponding to the n1 synchronization signal blocks is failure, and n1 is a positive integer.
That is, the terminal device receives a collision resolution message indicating that the terminal device is not the winner of the collision resolution after initiating random access using a certain transmission beam. The certain transmit beam is the appropriate transmit beam and the collision resolution failure is likely to be a random result. The terminal device may still continue to initiate random access using the certain transmit beam. Thus, the certain transmit beam may be stored in the first list of synchronization signal blocks for the terminal device to call from the first list of synchronization signal blocks.
Optionally, the method further comprises: storing a second synchronization signal block list, wherein the second synchronization signal block list comprises information of N2 synchronization signal blocks in the N synchronization signal blocks, any one of the N2 synchronization signal blocks meets a random access failure condition, and N2 is a positive integer less than or equal to N; the determining the second synchronization signal block according to the first synchronization signal block list includes: and according to the first synchronous signal block list and the second synchronous signal block list, excluding the n2 synchronous signal blocks from the n1 synchronous signal blocks, and determining the second synchronous signal block.
The information of the n2 synchronization signal blocks is, for example, an index identifier of the synchronization signal block, or an index identifier of a resource where the synchronization signal block is located, or other identification information corresponding to the synchronization signal block, which is not limited in this application.
In other words, the terminal device receives n2 synchronization signal blocks, determines n2 transmission beams corresponding to the n2 synchronization signal blocks one by one, and random access results corresponding to the n2 transmission beams all meet a random access failure condition. Therefore, the terminal device may not initiate random access using the transmission beams corresponding to the n2 synchronization signal blocks. The n2 synchronization signal blocks are stored in a second synchronization signal block list, and the terminal device may select the second synchronization signal block from the first synchronization signal block list, where information of the second synchronization signal block is not stored in the second synchronization signal block list. The second list of synchronization signal blocks may be understood as a blacklist of synchronization signal blocks, i.e. none of the synchronization signal blocks in the second list of synchronization signal blocks are used for initiating random access. When the terminal device updates the transmission beam (i.e. updates the transmission beam from the first transmission beam to the second transmission beam), the terminal device may exclude the synchronization signal blocks included in the second synchronization signal block list, and select the second synchronization signal block from the n synchronization signal blocks.
In one example, the terminal device initiates random access using the transmission beam corresponding to the synchronization signal block 1, where the random access result is failure, the terminal device may store the identification information of the synchronization signal block 1 in the second synchronization signal block list, so as to avoid the terminal device from using the transmission beam corresponding to the synchronization signal block 1 again.
Optionally, the random access failure condition is satisfied by any synchronization signal block, including: the number of times of sending the preamble corresponding to any synchronization signal block reaches a first preset threshold; or, executing random access corresponding to any synchronous signal block according to rated power; or alternatively; the beam corresponding to any synchronization signal block is a fault beam.
The following description will take, as an example, a target synchronization signal block in the second synchronization signal block list, where the target synchronization signal block is any synchronization signal block in the second synchronization signal block list.
In one example, the terminal device uses a power ramp manner to send the preamble corresponding to the target synchronization signal block multiple times with different sending powers, until the number of times of sending the preamble reaches a first preset threshold, and the terminal device may store the information of the target synchronization signal block in the second synchronization signal block list. For example, the first preset threshold is 3; the terminal equipment determines a target sending beam according to the target synchronous signal block; the terminal equipment uses the transmission power 10W and uses the target transmission beam to transmit a first preamble so as to execute the first random access, and the result of the first random access is failure; the terminal equipment uses the transmission power 15W and uses the target transmission beam to transmit a second preamble so as to execute the second random access, and the result of the second random access is failure; the terminal device uses the transmission power 20W and transmits a third preamble using the target transmission beam to perform a third random access, and the result of the third random access is failure. The terminal device may store the target synchronization signal block in the second synchronization signal block list since the number of times the preamble corresponding to the target synchronization signal block is transmitted to reach the first preset threshold.
In one example, a terminal device determines a target transmit beam from a target synchronization signal block; transmitting a preamble using the target transmit beam and using a maximum transmit power; the result of this random access is a failure, then the terminal device may store the information of the target synchronization signal block in the second synchronization signal block list. For example, the maximum transmission power is 25W, and the terminal device transmits the preamble using the target transmission beam using 25W, and the terminal device does not receive the random access response message corresponding to the target synchronization signal block, so that the random access fails this time. Since the target synchronization signal block satisfies the random access failure condition, the terminal device may store the target synchronization signal block in the second synchronization signal block list.
Alternatively, the reason for the random access failure is that the collision resolution message indicates that the terminal device is not the winner of the collision resolution, and the terminal device may not store the target synchronization signal block in the second synchronization signal block list.
In one example, the network device may send a message indicating to the terminal device that the target synchronization signal block is a faulty beam, and the terminal device may store the target synchronization signal block in the second synchronization signal block list.
Optionally, the method further comprises: according to the obtained sensor data, determining that the target displacement is larger than a second preset threshold; detecting that the received power of the first synchronization signal block is first received power at a first moment, detecting that the received power of the first synchronization signal block is second received power at a second moment, and the second moment is after the first moment; receiving M synchronous signal blocks sent by the network equipment under the condition that the first receiving power is larger than the second receiving power; determining a third synchronization signal block from the M synchronization signal blocks, wherein the third synchronization signal block is one of M synchronization signal blocks, the receiving power of each synchronization signal block in the M synchronization signal blocks is larger than the receiving power of M-M synchronization signal blocks except the M synchronization signal blocks in the M synchronization signal blocks, and M > M and M, M are positive integers; transmitting a preamble by using a third transmission beam corresponding to the third synchronization signal block; and transmitting a preamble using the first transmission beam in case that the first reception power is smaller than the second reception power.
The target displacement is understood to be the displacement that the terminal device is displaced in a unit time.
The terminal device is provided with a motion sensor which can detect the displacement of the terminal device. The motion sensor may be, for example, an inertial gyroscope, a global positioning system (global positioning system, GPS), or the like. In some cases, the terminal device may send and receive messages using the transceiver to determine the location information where the terminal device is located. The sensor may also be a device separate from the terminal device. The sensor in the application may be a device for acquiring information such as displacement and position by the terminal device. The data detected by the sensor is the sensor data.
The terminal device may determine that a relatively significant displacement of the terminal device has occurred based on the data detected by the sensor, which means that there is a possibility that both the optimal beam angle of the terminal device with respect to the network device and the optimal beam angle of the network device with respect to the terminal device may change. Therefore, the terminal device may receive the N synchronization signal blocks and detect the received powers of the N synchronization signal blocks at a first time, so that the terminal device may select the first synchronization signal block from the N synchronization signal blocks. At a second time point after the first time point, the terminal device detects the received power of the first synchronization signal block as a second received power again.
When the first received power is greater than the second received power, the received power of the first synchronization signal block may be considered to decrease over time. At this time, the received power of the first synchronization signal block is likely not optimal. For example, there may be other synchronization signal blocks having a received power greater than the received power of the first synchronization signal block. For another example, the received power of the first synchronization signal block gradually decays, meaning that the first transmit beam corresponding to the first synchronization signal block will not be the optimal transmit beam at some point in the future. Therefore, the terminal device can re-receive the synchronization signal block sent by the network device to re-initiate beam training and random access. Specific methods of beam training and random access may refer to steps 301 and 302 in the embodiment shown in fig. 3, and need not be described herein.
When the first received power is smaller than the second received power, the transmission beam corresponding to the first synchronization signal block may be considered to be relatively preferable. The terminal device may continue to initiate random access using the first transmit beam corresponding to the first synchronization signal block.
In case the first received power is slightly larger than the second received power, there may be a certain detection error. And in case the first received power is much larger than the second received power, the received power of the first synchronization signal block may be considered to be rapidly attenuated. The terminal device may reinitiate beam training and random access when the difference obtained by subtracting the second received power from the first received power is greater than a certain preset threshold (i.e. the difference obtained by subtracting the second received power from the first received power is sufficiently large), and may consider that the transmission beam corresponding to the first synchronization signal block is still relatively better when the difference obtained by subtracting the second received power from the first received power is less than a certain preset threshold (i.e. the difference obtained by subtracting the second received power from the first received power is negligible). The terminal device may continue to initiate random access using the first transmit beam corresponding to the first synchronization signal block.
The technical solution of the present application is further described below by means of a specific example. It should be understood that these specific embodiments are merely intended to help those skilled in the art to better understand the technical solutions of the present application, and are not limiting of the technical solutions of the present application.
It is assumed that the 5 synchronization signal blocks (i.e., n=5) received by the terminal device and transmitted by the network device are a synchronization signal block 1, a synchronization signal block 2, a synchronization signal block 3, a synchronization signal block 4, and a synchronization signal block 5, respectively. Wherein:
the transmission beam corresponding to the synchronization signal block 1 is a beam 1, and the beam angle of the beam 1 is a beam angle 1 (assumed to be 10 °);
the transmission beam corresponding to the synchronization signal block 2 is beam 2, and the beam angle of beam 2 is beam angle 2 (assumed to be 20 °);
the transmission beam corresponding to the synchronization signal block 3 is beam 3, and the beam angle of beam 3 is beam angle 3 (assumed to be 15 °);
the transmission beam corresponding to the synchronization signal block 4 is a beam 4, and the beam angle of the beam 4 is a beam angle 4 (assumed to be 16 °);
the transmission beam corresponding to the synchronization signal block 5 is a beam 5, and the beam angle of the beam 5 is a beam angle 5 (assumed to be 13 °).
The terminal device may measure the 5 synchronization signal blocks at time 1 to obtain 5 received powers corresponding to the 5 synchronization signal blocks one to one. Wherein:
The receiving power of the synchronous signal block 1 is receiving power 1, and the value of the receiving power 1 is 5W;
the receiving power of the synchronous signal block 2 is receiving power 2, and the value of the receiving power 2 is 8W;
the receiving power of the synchronous signal block 3 is receiving power 3, and the value of the receiving power 3 is 9W;
the receiving power of the synchronous signal block 4 is receiving power 4, and the value of the receiving power 4 is 10W;
the reception power of the synchronization signal block 5 is reception power 5, and the value of reception power 5 is 11W.
Assuming n=3, the terminal device determines 3 synchronization signal blocks from among the 5 synchronization signal blocks. Since the received power of the synchronization signal block 1 and the received power of the synchronization signal block 2 are smaller than the synchronization signal block 3, the synchronization signal block 4 and the synchronization signal block 5, the 3 synchronization signal blocks are the synchronization signal block 3, the synchronization signal block 4 and the synchronization signal block 5 respectively.
And, the terminal device may store the identification information of the synchronization signal block 3, the synchronization signal block 4, and the synchronization signal block 5 in the first synchronization signal block list. The first synchronization signal block list may store identification information of the synchronization signal blocks 3, 4, 5 and information of the reception power and/or beam angle of the synchronization signal blocks 3, 4, 5.
Because the received power 5 is larger, the terminal device may determine that the synchronization signal block 5 is the first synchronization signal block, and the beam 5 is the first transmission beam.
Alternatively, the terminal device may measure the first synchronization signal block again at a time 2 after the time 1 to obtain the received power 6 of the first synchronization signal block.
In case the value of the received power 6 is smaller than the value of the received power 5, the terminal device needs to reselect the randomly accessed transmission beam, i.e. discard the selected first transmission beam. The terminal device may re-receive the synchronization signal block sent by the network device, and specific steps are not described herein.
In another case, the value of the received power 6 is larger than the value of the received power 5, and the terminal device may initiate random access using the first transmission beam.
Alternatively, the terminal device may determine the first transmission power to be transmission power 1 according to the reception power 5. For example, the first transmission power is the same as the reception power 5, i.e., the value of transmission power 1 is 11W. There are many ways in which the terminal device determines the first transmit power, which will not be described in detail herein.
It is assumed here that the terminal device determines the value of the first transmission power (transmission power 1) to be 15W.
The terminal device transmits a preamble 1 using a beam 5 and using a transmission power 1 to perform random access 1. The result of random access 1 is a failure. The terminal device needs to initiate the random access again.
The terminal device may not receive the synchronization signal block sent by the network device, and continue to initiate random access by using the transmission beam corresponding to the synchronization signal block 5.
The terminal device may determine that the second transmission power is transmission power 2 in a power ramp manner, where transmission power 2=transmission power 1+ramp power step size. Assuming that the step size of the ramp-up power is 2W, the second transmission power (transmission power 2) is 17W.
The terminal device transmits a preamble 2 using a beam 5 and using a transmission power 2 to perform random access 2. The result of random access 2 is a failure. The terminal device needs to initiate the random access again.
In this case, it is assumed that the maximum transmission power of the terminal device is 18W. According to the rule of power climbing, the transmission power which should be used by the terminal equipment for initiating random access again is 19W, and exceeds the maximum transmission power of the terminal equipment. Thus, the terminal device may use other transmission beams than transmission beam 5.
In another case, the maximum lifting frequency is 1, that is, when the terminal equipment initiates random access by repeatedly using a certain transmission beam, the terminal equipment only allows to lift the transmission power once. The number of boosting times corresponding to the transmission power 2 is 1, so the terminal device can use other transmission beams than the transmission beam 5.
Alternatively, the terminal device may store the identification information of the synchronization signal block 5 in the second synchronization signal block list.
The terminal device may select an appropriate synchronization signal block from the first synchronization signal block list as the second synchronization signal block, and exclude the synchronization signal block in the second synchronization signal block list. For example, when the information of the synchronization signal blocks 3 and 4 is not included in the second synchronization signal block list, an appropriate synchronization signal block is selected from the synchronization signal blocks 3 and 4.
In one possible way, the terminal device selects an appropriate synchronization signal block according to the received power of the synchronization signal block. Since the received power of the synchronization signal block 4 is greater than the received power of the synchronization signal block 3, the terminal device can determine the synchronization signal block 4 as a second synchronization signal block and initiate random access using the transmission beam 4.
Alternatively, the terminal device may directly transmit the preamble 3 using the maximum transmission power of the terminal device.
In another possible way, the terminal device selects the appropriate synchronization signal block according to the beam angle of the synchronization signal block. Since the beam angle of the synchronization signal block 3 is closer to the beam angle of the synchronization signal block 5, the terminal device can determine the synchronization signal block 3 as a second synchronization signal block and initiate random access using the transmission beam 3.
Alternatively, the terminal device may directly transmit the preamble 3 using the maximum transmission power of the terminal device.
Fig. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication means may be a terminal device or may be a component (e.g. a chip or a circuit) usable in a terminal device. As shown in fig. 4, the communication apparatus 400 may include a receiving module 401, a processing module 402, and a transmitting module 403.
The receiving module 401 is configured to receive N synchronization signal blocks sent by a network device, where N is an integer greater than 1.
A processing module 402, configured to determine a first synchronization signal block from the N synchronization signal blocks, where the first synchronization signal block is one of N synchronization signal blocks, and a received power of each of the N synchronization signal blocks is greater than a received power of N-N synchronization signal blocks of the N synchronization signal blocks divided by the N synchronization signal blocks, where N > N and N are positive integers.
A transmitting module 403, configured to transmit a first preamble using a first transmit power by using a first transmit beam corresponding to the first synchronization signal block, so as to perform a first random access.
In case the first random access fails, the transmitting module 403 is further configured to transmit a second preamble using a second transmit power using the first transmit beam to perform a second random access, the second transmit power being higher than the first transmit power.
The processing module 402 may be implemented by a processor. The receiving module 401 may be implemented by a receiver. The transmitting module 403 may be implemented by a transmitter. The specific functions and advantages of the processing module 402, the receiving module 401, and the sending module 403 may be referred to the method shown in fig. 3, and will not be described herein.
In a possible embodiment, a communication device is also provided, which may be a terminal device, or may be a component (e.g. a chip or a circuit, etc.) for a terminal device. The communication device may include a transceiver and a processor, and optionally, may also include a memory. Wherein the transceiver may be adapted to implement the respective functions and operations corresponding to the above-described receiving and transmitting modules and the processor may be adapted to implement the respective functions and operations of the above-described processing modules. The memory may be used for storing execution instructions or application program codes, and the processor controls the execution of the execution, so as to implement the communication method provided by the above embodiments of the present application; and/or may also be used to temporarily store some data and instruction information, etc. The memory may exist separately from the processor, in which case the memory may be coupled to the processor via a communication line. In yet another possible design, the memory may be integrated with the processor, which is not limited in this application.
Fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication means may be a network device or may be a component (e.g. a chip or a circuit etc.) for a network device. As shown in fig. 5, the communication device 500 may include a transmission module 501.
A sending module 501, configured to send N synchronization signal blocks to a network device, where N is an integer greater than 1.
The transmitting module 501 may be implemented by a transmitter. The specific functions and advantages of the sending module 501 may be referred to as the method shown in fig. 3, and will not be described herein.
In a possible embodiment, a communication apparatus is also provided, which may be a network device, or may be a component (e.g. a chip or a circuit, etc.) for a network device. The communication device may include a transceiver and a processor, and optionally, may also include a memory. Wherein the transceiver may be used to implement the corresponding functions and operations corresponding to the above-described transmitting modules. The memory may be used for storing execution instructions or application program codes, and the processor or the sending module controls the execution, so as to implement the communication method provided by the above embodiments of the present application; and/or may also be used to temporarily store some data and instruction information, etc. The memory may exist separately from the processor, in which case the memory may be coupled to the processor via a communication line. In yet another possible design, the memory may be integrated with the processor, which is not limited in this application.
Fig. 6 is a block diagram of a terminal device according to an embodiment of the present application. As shown in fig. 6, the terminal device includes a processor 601, a memory 602, a radio frequency circuit, an antenna, and input-output means. The processor 601 may be used for processing communication protocols and communication data, as well as for controlling the terminal device, executing software programs, processing data of software programs, etc. The memory 602 is used primarily to store software programs and data. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user. It should be noted that some kinds of terminal apparatuses may not have an input/output device.
When data needs to be transmitted, the processor 601 performs baseband processing on the data to be transmitted, and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor is shown in fig. 6. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, which is not limited by the embodiments of the present application.
In the embodiment of the present application, the antenna and the radio frequency circuit with the transceiver function may be regarded as the transceiver 603 of the terminal device, and the processor with the processing function may be regarded as the processing unit of the terminal device. The transceiver may also be referred to as a transceiver unit, transceiver device, etc. The processing unit may also be called a processor, a processing board, a processing module, a processing device, etc. Alternatively, the device for implementing the receiving function in the transceiver 603 may be regarded as a receiving unit, and the device for implementing the transmitting function in the transceiver 603 may be regarded as a transmitting unit, i.e. the transceiver 603 includes a receiving unit and a transmitting unit. The receiving unit may also be referred to as a receiver, or receiving circuit, among others. The transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.
The processor 601, memory 602, and transceiver 603 communicate with each other via internal communication paths to transfer control and/or data signals
The method disclosed in the embodiments of the present application may be applied to the processor 601 or implemented by the processor 601. The processor 601 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 601 or instructions in the form of software.
The processor described in the various embodiments of the present application may be a general purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a memory medium well known in the art such as random access memory (random access memory, RAM), flash memory, read-only memory (ROM), programmable read-only memory, or electrically erasable programmable memory, registers, and the like. The storage medium is located in a memory, and the processor reads instructions from the memory and, in combination with its hardware, performs the steps of the method described above.
Alternatively, in some embodiments, the memory 602 may store instructions for performing a method performed by a terminal device in the method shown in fig. 3. The processor 601 may execute instructions stored in the memory 602 in combination with other hardware (e.g., transceiver 603) to perform steps performed by the terminal device in the method of fig. 3. Specific operational procedures and advantages may be seen from the description of the embodiment of fig. 3.
The embodiment of the application also provides a chip, which comprises a receiving and transmitting unit and a processing unit. The receiving and transmitting unit can be an input and output circuit and a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit on the chip. The chip may execute the method at the terminal device side in the method embodiment described above.
The embodiment of the application also provides a computer readable storage medium, on which instructions are stored, which when executed, perform the method on the terminal device side in the method embodiment.
The embodiment of the application also provides a computer program product containing instructions, which when executed, perform the method on the terminal device side in the method embodiment.
Fig. 7 is a block diagram of a network device according to an embodiment of the present application. As shown in fig. 7, the network device includes a processor 701, a memory 702, a radio frequency circuit, an antenna, and an input-output device. The processor 701 may be configured to process communication protocols and communication data, control the network device, execute software programs, process data from software programs, and the like. The memory 702 is used primarily to store software programs and data. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user. It should be noted that some kinds of network devices may not have an input/output device.
When data needs to be transmitted, the processor 701 performs baseband processing on the data to be transmitted, and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the network device, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor is shown in fig. 7. In an actual network device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, which is not limited by the embodiments of the present application.
In the embodiment of the present application, the antenna and the radio frequency circuit with the transceiver function may be regarded as the transceiver 703 of the network device, and the processor with the processing function may be regarded as the processing unit of the network device. The transceiver may also be referred to as a transceiver unit, transceiver device, etc. The processing unit may also be called a processor, a processing board, a processing module, a processing device, etc. Alternatively, a device for implementing a receiving function in the transceiver 703 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver 703 may be regarded as a transmitting unit, i.e. the transceiver 703 includes a receiving unit and a transmitting unit. The receiving unit may also be referred to as a receiver, or receiving circuit, among others. The transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.
The processor 701, the memory 702 and the transceiver 703 communicate with each other via internal communication paths to transfer control and/or data signals
The method disclosed in the embodiments of the present application may be applied to the processor 701 or implemented by the processor 701. The processor 701 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 701 or by instructions in the form of software.
The processor described in the various embodiments of the present application may be a general purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a memory medium well known in the art such as random access memory (random access memory, RAM), flash memory, read-only memory (ROM), programmable read-only memory, or electrically erasable programmable memory, registers, and the like. The storage medium is located in a memory, and the processor reads instructions from the memory and, in combination with its hardware, performs the steps of the method described above.
Alternatively, in some embodiments, the memory 702 may store instructions for performing a method performed by a network device in the method shown in FIG. 3. The processor 701 may execute instructions stored in the memory 702 in conjunction with other hardware (e.g., transceiver 703) to perform steps performed by the network device in the method of fig. 3. Specific operational procedures and advantages may be seen from the description of the embodiment of fig. 3.
The embodiment of the application also provides a chip, which comprises a receiving and transmitting unit and a processing unit. The receiving and transmitting unit can be an input and output circuit and a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit on the chip. The chip can execute the method at the network equipment side in the method embodiment.
The embodiment of the application also provides a computer readable storage medium, on which instructions are stored, which when executed, perform the method on the network device side in the method embodiment.
The embodiment of the application also provides a computer program product containing instructions, which when executed, perform the method on the network device side in the method embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components 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 units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (18)
1. A method of random access, comprising:
receiving N synchronous signal blocks sent by network equipment, wherein N is an integer greater than 1;
determining a first synchronization signal block from the N synchronization signal blocks, wherein the first synchronization signal block is one of the N synchronization signal blocks, the receiving power of each synchronization signal block in the N synchronization signal blocks is larger than the receiving power of N-N synchronization signal blocks except the N synchronization signal blocks in the N synchronization signal blocks, and N is larger than N and N is a positive integer;
transmitting a first preamble using a first transmission power using a first transmission beam corresponding to the first synchronization signal block to perform a first random access;
transmitting a second preamble using the first transmit beam and using a second transmit power, which is higher than the first transmit power, to perform a second random access in case the first random access fails
According to the obtained sensor data, determining that the target displacement is larger than a second preset threshold;
detecting that the received power of the first synchronization signal block is first received power at a first moment, detecting that the received power of the first synchronization signal block is second received power at a second moment, and the second moment is after the first moment;
In case the first received power is greater than the second received power,
receiving M synchronous signal blocks sent by the network equipment;
determining a third synchronization signal block from the M synchronization signal blocks, wherein the third synchronization signal block is one of M synchronization signal blocks, the receiving power of each synchronization signal block in the M synchronization signal blocks is larger than the receiving power of M-M synchronization signal blocks except the M synchronization signal blocks in the M synchronization signal blocks, and M > M and M, M are positive integers;
transmitting a preamble by using a third transmission beam corresponding to the third synchronization signal block;
in case the first received power is smaller than the second received power,
and transmitting a preamble using the first transmission beam.
2. The method of claim 1, wherein prior to said transmitting a second preamble using a second transmit power using the first transmit beam, the method further comprises:
and ignoring the synchronous signal block sent by the network equipment.
3. The method according to claim 1 or 2, wherein in case the second transmission power meets a preset condition and the second random access fails, the method further comprises:
Determining a second synchronous signal block from the n synchronous signal blocks, wherein n is greater than 1;
transmitting a third preamble at a third transmission power using a second transmission beam corresponding to the second synchronization signal block to perform a third random access;
wherein the second transmission power satisfies a preset condition, including:
the second transmission power reaches the maximum transmission power; or,
and the power lifting times corresponding to the second transmitting power reach the maximum lifting times.
4. A method according to claim 3, characterized in that the third transmission power is the maximum transmission power or the third transmission power is determined by the reception power of the second synchronization signal block.
5. A method according to claim 3, wherein prior to said determining a second synchronization signal block, the method further comprises:
storing a first synchronization signal block list, wherein the first synchronization signal block list comprises identification information of the n synchronization signal blocks;
the determining a second synchronization signal block includes:
and determining the second synchronous signal block according to the first synchronous signal block list.
6. The method of claim 5, wherein the first synchronization signal block list further includes information indicating a random access order of the n synchronization signal blocks, and wherein the information indicating the random access order of the n synchronization signal blocks includes an order in which the n synchronization signal blocks are arranged in a reception power from large to small or an order in which the n synchronization signal blocks are arranged in a beam angle from small to large.
7. The method according to claim 5 or 6, wherein the first synchronization signal block list further includes n1 synchronization signal blocks, the conflict resolution result corresponding to the n1 synchronization signal blocks is failure, and n1 is a positive integer.
8. The method according to claim 5 or 6, characterized in that the method further comprises:
storing a second synchronization signal block list, wherein the second synchronization signal block list comprises information of N2 synchronization signal blocks, any one of the N2 synchronization signal blocks meets a random access failure condition, and N2 is a positive integer less than or equal to N;
the determining the second synchronization signal block according to the first synchronization signal block list includes:
and according to the first synchronous signal block list and the second synchronous signal block list, excluding the n2 synchronous signal blocks from the n synchronous signal blocks, and determining the second synchronous signal block.
9. The method of claim 8, wherein the random access failure condition is satisfied by any of the synchronization signal blocks, comprising:
the number of times of sending the preamble corresponding to any synchronization signal block reaches a first preset threshold; or,
Performing random access corresponding to the arbitrary synchronization signal block using the maximum transmission power; or alternatively;
the beam corresponding to any synchronization signal block is a fault beam.
10. An apparatus for performing random access, comprising:
the receiving module is used for receiving N synchronous signal blocks sent by the network equipment, wherein N is an integer greater than 1;
the processing module is used for determining a first synchronous signal block from the N synchronous signal blocks, wherein the first synchronous signal block is one of the N synchronous signal blocks, the receiving power of each synchronous signal block in the N synchronous signal blocks is larger than the receiving power of N-N synchronous signal blocks divided by the N synchronous signal blocks in the N synchronous signal blocks, and N is a positive integer;
a transmitting module, configured to transmit a first preamble using a first transmit power using a first transmit beam corresponding to the first synchronization signal block, so as to perform a first random access;
the transmitting module is further configured to transmit a second preamble using a second transmit power using the first transmit beam to perform a second random access in case the first random access fails, the second transmit power being higher than the first transmit power;
The processing module is further used for determining that the target displacement is larger than a second preset threshold according to the obtained sensor data;
the processing module is further configured to detect, at a first time, that a received power of the first synchronization signal block is a first received power, and detect, at a second time, that a received power of the first synchronization signal block is a second received power, where the second time is after the first time;
in case the first received power is greater than the second received power,
the receiving module is further configured to receive M synchronization signal blocks sent by the network device,
the processing module is further configured to determine a third synchronization signal block from the M synchronization signal blocks, where the third synchronization signal block is one of M synchronization signal blocks, a received power of each of the M synchronization signal blocks is greater than a received power of M-M synchronization signal blocks of the M synchronization signal blocks except the M synchronization signal blocks, M > M, and M, M are positive integers;
the transmitting module is further configured to transmit a preamble using a third transmit beam corresponding to the third synchronization signal block;
in case the first received power is smaller than the second received power,
The transmitting module is further configured to transmit a preamble using the first transmit beam.
11. The apparatus of claim 10, wherein, prior to said transmitting a second preamble using a second transmit power using said first transmit beam,
the receiving module is further configured to ignore a synchronization signal block sent by the network device.
12. The apparatus according to claim 10 or 11, wherein, in case the second transmission power satisfies a preset condition and the second random access fails,
the processing module is further configured to determine a second synchronization signal block from the n synchronization signal blocks, where n is greater than 1;
the transmitting module is further configured to transmit a third preamble according to a third transmission power using a second transmission beam corresponding to the second synchronization signal block to perform a third random access;
wherein the second transmission power satisfies a preset condition, including:
the second transmission power reaches the maximum transmission power; or,
and the power lifting times corresponding to the second transmitting power reach the maximum lifting times.
13. The apparatus of claim 12, wherein the third transmit power is a maximum transmit power or is determined by a receive power of the second synchronization signal block.
14. The apparatus of claim 12, wherein prior to said determining a second synchronization signal block,
the processing module is further configured to store a first synchronization signal block list, where the first synchronization signal block list includes identification information of the n synchronization signal blocks;
the processing module is specifically configured to determine the second synchronization signal block according to the first synchronization signal block list.
15. The apparatus of claim 14, wherein the first list of synchronization signal blocks further comprises information indicating a random access order of the n synchronization signal blocks, wherein the information indicating the random access order of the n synchronization signal blocks comprises an order in which the n synchronization signal blocks are arranged in a reception power from large to small or an order in which the n synchronization signal blocks are arranged in a beam angle from small to large.
16. The apparatus according to claim 14 or 15, wherein the first synchronization signal block list further includes n1 synchronization signal blocks, the conflict resolution result corresponding to the n1 synchronization signal blocks is failure, and n1 is a positive integer.
17. The apparatus according to claim 14 or 15, wherein,
the processing module is further configured to store a second synchronization signal block list, where the second synchronization signal block list includes information of N2 synchronization signal blocks, any one of the N2 synchronization signal blocks satisfies a random access failure condition, and N2 is a positive integer less than or equal to N;
The processing module is specifically configured to exclude the n2 synchronization signal blocks from the n synchronization signal blocks according to the first synchronization signal block list and the second synchronization signal block list, and determine the second synchronization signal block.
18. The apparatus of claim 17, wherein the random access failure condition is satisfied by the arbitrary synchronization signal block, comprising:
the number of times of sending the preamble corresponding to any synchronization signal block reaches a first preset threshold; or,
performing random access corresponding to the arbitrary synchronization signal block using the maximum transmission power; or alternatively;
the beam corresponding to any synchronization signal block is a fault beam.
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