CN108282894B - Cell access method, base station and terminal - Google Patents

Cell access method, base station and terminal Download PDF

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Publication number
CN108282894B
CN108282894B CN201710010434.3A CN201710010434A CN108282894B CN 108282894 B CN108282894 B CN 108282894B CN 201710010434 A CN201710010434 A CN 201710010434A CN 108282894 B CN108282894 B CN 108282894B
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China
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terminal
reciprocity
base station
receiving
beams
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CN108282894A (en
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王飞
吴丹
童辉
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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Priority to CN201710010434.3A priority Critical patent/CN108282894B/en
Priority to PCT/CN2018/070084 priority patent/WO2018127047A1/en
Publication of CN108282894A publication Critical patent/CN108282894A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Abstract

The invention provides a cell access method, a base station and a terminal. The invention realizes the sending of random-access preamble in the Physical Random Access Channel (PRACH) process, can be suitable for various conditions that the base station side has or does not have the reciprocity of receiving and sending beams and the terminal has or does not have the reciprocity of receiving and sending beams, and can effectively support the initial cell access based on multi-beam in the 5G system.

Description

Cell access method, base station and terminal
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a cell access method, a base station, and a terminal.
Background
Since a single beam formed by a 5G high-band large-scale antenna is narrow and cannot cover the whole cell, the 5G system design introduces a multi-beam concept, such as the method and flow of initial cell access based on multi-beam in question.
For initial cell access based on multi-beam, a base station generally needs to transmit a new air interface-primary synchronization signal (NR-PSS) and/or a new air interface-secondary synchronization signal NR-SSS and/or new air interface (NR) system information through a beam scanning method, where the system information may include a new air interface physical broadcast channel (NR-PBCH) and a new air interface system information block (NR-SIB).
The concept of reciprocity (Beam reciprocity) of the transmit and receive beams referred to herein is presented below:
for a base station, if the optimal transmit Beam (TRP-Tx-Beam) of the base station in downlink can be equated with the optimal receive Beam (TRP-Rx-Beam) of the base station in uplink, or the optimal receive Beam (TRP-Rx-Beam) of the base station in uplink can be equated with the optimal transmit Beam (TRP-Tx-Beam) of the base station in downlink, it is said that the base station side has reciprocity of transceiving beams, i.e., the base station side satisfies Beam correspondance.
Similarly, for a terminal, if an optimal reception Beam (UE-Rx-Beam) of the terminal in the downlink can be equated with an optimal transmission Beam (UE-Tx-Beam) of the terminal in the uplink, or an optimal transmission Beam (UE-Tx-Beam) of the terminal in the uplink can be equated with an optimal reception Beam (UE-Rx-Beam) of the terminal in the downlink, it is said that the terminal has reciprocity of the transmission and reception beams, i.e., the terminal satisfies Beam correspondance.
The prior art has not provided a scheme capable of supporting initial cell access based on multi-beam in a 5G system aiming at various situations that a base station side has/does not have reciprocity of receiving and transmitting beams and a terminal has/does not have reciprocity of receiving and transmitting beams.
Disclosure of Invention
The technical problem to be solved in the embodiments of the present invention is to provide a cell access method, a base station, and a terminal, which are used to effectively support initial cell access based on multiple beams in a 5G system.
In order to solve the above technical problem, a method for cell access provided in an embodiment of the present invention includes:
the base station determines a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code, wherein the receiving and transmitting reciprocity combination comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal;
and the base station detects the lead code sent by the terminal according to the receiving and sending reciprocity combination and determines the optimal receiving and sending wave beam of the uplink and the downlink according to the detection result of the resource where the lead code is located.
Another method for accessing a cell provided in an embodiment of the present invention includes:
the terminal determines a transceiving reciprocity combination based on which the preamble is transmitted, wherein the transceiving reciprocity combination comprises a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal;
and the terminal sends the lead code based on the receiving and sending reciprocity combination.
An embodiment of the present invention further provides a base station, including:
a first determining unit, configured to determine a reciprocity of transceiving combination based on which the terminal transmits the preamble, where the reciprocity of transceiving combination includes a reciprocity of transceiving beams assumption of the base station and a reciprocity of transceiving beams assumption of the terminal;
a detection unit, configured to detect a preamble sent by the terminal according to the reciprocity combination of the transceiving;
and the second determining unit is used for determining the optimal transceiving wave beams of the uplink and the downlink according to the detection result of the resource where the lead code is located.
An embodiment of the present invention further provides a terminal, including:
a first determining unit configured to determine a reciprocity of transceiving combination based on which the preamble is transmitted, the reciprocity of transceiving combination including a reciprocity of transceiving beams assumption of a base station and a reciprocity of transceiving beams assumption of a terminal;
a sending unit, configured to send a preamble based on the reciprocity combination of transceiving.
Compared with the prior art, the cell access method, the base station and the terminal provided by the embodiment of the invention realize the transmission of the random-access preamble in the Physical Random Access Channel (PRACH) process, can be suitable for various conditions that the base station side has or does not have the reciprocity of receiving and transmitting beams and the terminal has or does not have the reciprocity of receiving and transmitting beams, and can effectively support the initial cell access based on multi-beam in a 5G system.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for cell access according to an embodiment of the present invention when the method is applied to a base station side;
fig. 2 is a flowchart illustrating a method for cell access according to an embodiment of the present invention when the method is applied to a terminal side;
fig. 3 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 5 is a schematic view of an application scenario of example 1 according to an embodiment of the present invention;
fig. 6 is a schematic view of an application scenario of example 2 according to an embodiment of the present invention;
fig. 7 is a schematic view of an application scenario of example 3 according to an embodiment of the present invention;
fig. 8 is a schematic view of an application scenario of example 4 according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention. In addition, the terms "system" and "network" are often used interchangeably herein.
In the embodiment of the present invention, the Base Station may be a Macro Base Station (Macro Base Station), a micro Base Station (Pico Base Station), a Node B (the name of a 3G mobile Base Station), an enhanced Base Station (eNB), a Home enhanced Base Station (Femto eNB or Home eNode B or Home eNB or HeNB), a relay Station, an access point, an RRU (Remote Radio Unit), an RRH (Remote Radio Head), a network side Node in a 5G mobile communication system, such as a Central Unit (CU, Central Unit) and a Distributed Unit (DU, Distributed Unit), and the like. The terminal may be a mobile phone (or handset), or other device capable of sending or receiving wireless signals, including a User Equipment (UE), a Personal Digital Assistant (PDA), a wireless modem, a wireless communicator, a handheld device, a laptop computer, a cordless phone, a Wireless Local Loop (WLL) station, a CPE (Customer Premise Equipment) or mobile smart hotspot capable of converting mobile signals to WiFi signals, a smart appliance, or other device capable of autonomously communicating with a mobile communication network without human operation, etc.
The embodiment of the invention provides a method for accessing an initial cell in a mobile communication system, and particularly provides a transmission scheme of a random-access preamble in a Physical Random Access Channel (PRACH) process, which can be applied to various situations that a base station side has or does not have reciprocity for receiving and transmitting beams and a terminal has or does not have reciprocity for receiving and transmitting beams, and can effectively support initial cell access based on multi-beam in a 5G system.
Referring to fig. 1, the method for cell access provided in the embodiment of the present invention, when applied to a base station side, includes the following steps:
and step 11, the base station determines a transceiving reciprocity combination based on which the terminal sends the lead code, wherein the transceiving reciprocity combination comprises a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal.
Here, the terminal according to the embodiment of the present invention transmits the random access preamble in the PRACH procedure based on a certain specific reciprocity combination for transmission and reception. The reciprocity combination includes whether the base station has reciprocity for transmitting and receiving beams and whether the terminal has reciprocity for transmitting and receiving beams.
Specifically, the above-mentioned reciprocity combination of transceiving may be a certain default combination configured in advance by both the base station and the terminal, and at this time, the base station and the terminal have the same default reciprocity combination of transceiving, and in this step, the base station may directly use the default reciprocity combination of transceiving as the reciprocity combination of transceiving based on which the terminal transmits the preamble.
Of course, in the embodiment of the present invention, the base station may also specify the reciprocity combination of the transmission and reception used by the terminal. For example, before step 11, the base station may broadcast and transmit first indication information, which may be specifically transmitted by a system message (such as NR-PBCH and/or NR-SIB) or a signaling manner, where the first indication information includes a reciprocity assumption of a transmit-receive beam of the base station and a reciprocity assumption of a transmit-receive beam of the terminal. At this time, the base station may determine a reciprocity combination of transmission and reception based on which the terminal transmits the preamble, according to the first indication information transmitted in advance.
As another implementation, the terminal may autonomously select its own reciprocity assumption for the transmit and receive beams. At this time, before step 11, the base station may broadcast and send second indication information, which may specifically be sent through a system message (such as NR-PBCH and/or NR-SIB) or a signaling manner, where the second indication information includes a reciprocity assumption of a transmit-receive beam of the base station and indicates that the terminal autonomously selects the reciprocity assumption of the transmit-receive beam of the terminal. Subsequently, the terminal may send the third indication information of the reciprocity assumption of the transmit-receive beam selected by the terminal itself to the base station through an explicit sending or implicit sending manner. In this way, the base station may determine, based on the second indication information and the third indication information, a transceivedreciprocity combination on which the terminal transmits the preamble.
One implementation of the above explicit transmission is as follows: the terminal may transmit in a manner of carrying the relevant indication information in the preamble, and at this time, the existing preamble needs to be extended.
One implementation of the implicit transmission is as follows: the terminal determines a first lead code group corresponding to the transmit-receive beam reciprocity hypothesis of the terminal according to the autonomously selected transmit-receive beam reciprocity hypothesis, and selects a lead code adopted by the terminal from the first lead code group for transmission, wherein different lead code groups correspond to different transmit-receive beam reciprocity hypotheses of the terminal. In this way, the base station may determine, according to the first preamble packet to which the preamble transmitted by the terminal belongs, the transmit-receive beam reciprocity hypothesis corresponding to the first preamble packet, to obtain the transmit-receive beam reciprocity hypothesis of the terminal.
And step 12, the base station detects the lead code sent by the terminal according to the receiving-transmitting reciprocity combination.
Here, the base station may determine a location of the first resource corresponding to the reciprocity transceiver combination, in an embodiment of the present invention, different reciprocity transceiver combinations correspond to different predefined resources, and resources corresponding to different reciprocity transceiver combinations have different time-frequency resource locations. Here, the resources corresponding to the reciprocity combination of transmission and reception are predefined. For example, with reference to the resource location of the PSS, several resources with different time-frequency resource locations are defined, and each resource corresponds to one reciprocity combination of transceiving. It will be appreciated that 4 resources will typically need to be defined to correspond to the 4 possible combinations of reciprocity of transceiving. As an implementation manner, each resource (e.g., the first resource) includes multiple sets of sub-resources with the same time domain position but different frequency domain positions, the different sub-resources correspond to different predefined optimal downlink beams, and the terminal sends a preamble on the sub-resource corresponding to one of the optimal downlink beams. The downlink optimal beam comprises a downlink optimal base station transmitting beam and/or a downlink optimal terminal receiving beam. As an implementation manner, the downlink optimal beam may include an optimal transmit beam of the base station and an optimal receive beam of the terminal at the same time. Then, the base station detects and receives the preamble sent by the terminal through each receiving beam of the base station on the first resource by adopting a beam scanning mode.
And step 13, the base station determines the optimal transceiving wave beams of the uplink and downlink according to the detection result of the resource where the lead code is located.
Here, for each optimal transceiving beam of the uplink and downlink, the determination may be specifically performed in the following manner, where:
the optimal transmitting beam of the base station is obtained by the base station according to the first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the base station has reciprocity of transmitting and receiving beams and the optimal receiving beam of the base station;
the optimal receiving beam of the terminal is obtained by the base station according to the first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the terminal has reciprocity of receiving and sending beams and the optimal sending beam of the terminal;
the base station optimal receiving beam is determined by the base station according to the base station receiving beam corresponding to the lead code with the optimal receiving signal quality, or the base station optimal receiving beam according to the assumption that the base station has reciprocity of receiving and transmitting beams;
the terminal optimal transmission beam is determined by the base station based on the terminal reception beam corresponding to the preamble with the optimal reception signal quality, or determined based on the assumption that the terminal has reciprocity of transmission and reception beams and the terminal optimal reception beam.
Preferably, as an implementation manner, when the downlink optimal beam includes both the base station optimal transmission beam and the terminal optimal reception beam, in step 13, the base station may determine the first downlink optimal beam corresponding to the first sub-resource according to the first sub-resource of the preamble detected in the first resource location, so as to obtain the base station optimal transmission beam and the terminal optimal reception beam of the downlink. In addition, the base station may further obtain the optimal base station receiving beam and the optimal terminal transmitting beam of the uplink according to the base station receiving beam and the terminal transmitting beam corresponding to the preamble with the optimal received signal quality on the first sub-resource.
Through the steps, the embodiment of the invention realizes the determination of the optimal wave beam in the initial cell access process, can be suitable for various conditions that the base station side has/does not have the reciprocity of the receiving and sending wave beams and the terminal has/does not have the reciprocity of the receiving and sending wave beams, and can effectively support the initial cell access based on the multi-wave beams in a 5G system.
In the above step, the terminal needs to know the optimal base station transmission beam and the optimal terminal reception beam of the downlink when transmitting the preamble, for this reason, in the embodiment of the present invention, the base station may transmit the predetermined information through each transmission beam of the base station in a beam scanning manner before step 11, where the predetermined information includes at least one of synchronization information (such as PSS/SSS), physical broadcast channel information (PBCH), and System Information (SIB). Thus, the terminal receives the predetermined information in a beam scanning mode, and according to the receiving result, the optimal transmitting beam of the base station and the optimal receiving beam of the terminal can be determined.
In the above step 12, the transceiver reciprocity combinations include 4 different combinations:
1) when the receiving and sending reciprocity combination is that neither the base station nor the terminal has receiving and sending beam reciprocity, the first resource comprises N groups of sub-resources with the same time domain position but different frequency domain positions, wherein N is equal to the product of the number of base station beams and the number of terminal beams. At this time, the terminal adopts a beam scanning mode on a sub-resource corresponding to one of the downlink optimal beams, and transmits the preamble through each transmission beam of the terminal. Herein, the number of terminal beams refers to the number of terminal reception beams or the number of terminal transmission beams, and generally the number of terminal reception beams or the number of terminal transmission beams is equal. Similarly, the number of base station beams refers to the number of base station receiving beams or the number of base station transmitting beams, and usually the number of base station receiving beams or the number of base station transmitting beams are equal.
2) When the receiving and transmitting reciprocity combination is that the base station has receiving and transmitting beam reciprocity but the terminal does not have the receiving and transmitting beam reciprocity, the first resource comprises M groups of sub-resources with the same time domain position but different frequency domain positions, wherein M is equal to the number of terminal beams, and the terminal adopts a beam scanning mode on the sub-resource corresponding to one downlink optimal beam to respectively transmit lead codes through each transmitting beam of the terminal.
3) And when the receiving and sending reciprocity combination is that the base station does not have the receiving and sending beam reciprocity but the terminal has the receiving and sending beam reciprocity, the first resource comprises L groups of sub-resources with the same time domain position but different frequency domain positions, wherein L is equal to the product of the number of base station beams and the number of terminal beams, and the terminal sends a lead code through the terminal sending beam corresponding to the sub-resource on the sub-resource corresponding to one downlink optimal beam. Here, the terminal transmission beam corresponding to the sub-resource may be determined according to the ID of the terminal optimal reception beam included in the downlink optimal beam corresponding to the sub-resource, and for example, the terminal transmission beam corresponding to the ID of the terminal optimal reception beam is used for transmission.
4) When the receiving and sending reciprocity combination is that both the base station and the terminal have receiving and sending beam reciprocity, the first resource comprises P groups of sub-resources with the same time domain position but different frequency domain positions, wherein P is equal to the number of terminal beams, and the terminal sends a lead code through a terminal sending beam corresponding to the sub-resource on the sub-resource corresponding to one of the downlink optimal beams. Here, the terminal transmission beam corresponding to the sub-resource may be determined according to the ID of the terminal optimal reception beam included in the downlink optimal beam corresponding to the sub-resource, and for example, the terminal transmission beam corresponding to the ID of the terminal optimal reception beam is used for transmission.
The method for cell access according to the embodiment of the present invention is described above from the base station side, and the following description is given from the terminal side.
Referring to fig. 2, the method for cell access provided by the embodiment of the present invention, when applied to a terminal side, includes the following steps:
in step 21, the terminal determines a reciprocity combination of transceiving based on which the preamble is transmitted, the reciprocity combination of transceiving including a reciprocity assumption of transceiving beams of the base station and a reciprocity assumption of transceiving beams of the terminal.
Corresponding to the foregoing embodiments, as an implementation manner, the terminal may combine the default transceiving reciprocity configured in advance as the transceiving reciprocity combination based on which the preamble is transmitted.
As another implementation manner, the terminal may determine the transceiver-reciprocity combination based on which the terminal transmits the preamble according to first indication information previously transmitted by the base station, where the first indication information includes a transceiver-beam reciprocity hypothesis of the base station and a transceiver-beam reciprocity hypothesis of the terminal. At this time, before step 21, the terminal may also receive the first indication information broadcast by the base station.
As another implementation manner, the terminal may determine a reciprocity hypothesis of transmit-receive beams of the base station according to second indication information sent by the base station in advance, and the terminal autonomously selects the reciprocity hypothesis of the transmit-receive beams of the terminal to obtain a reciprocity combination based on which the terminal sends the preamble; the second indication information comprises a receiving and sending beam reciprocity hypothesis of the base station and indicates the terminal to autonomously select the receiving and sending beam reciprocity hypothesis of the terminal. At this time, the terminal may further determine a first preamble packet corresponding to the transmit-receive beam reciprocity hypothesis of the terminal, and select a preamble adopted by the terminal from the first preamble packet for the subsequent transmission in step 22, where different preamble packets correspond to different transmit-receive beam reciprocity hypotheses of the terminal.
And step 22, the terminal sends the lead code based on the receiving-transmitting reciprocity combination.
Here, the terminal determines, based on the reciprocity combination of transceiving, a location of a first resource corresponding to the reciprocity combination of transceiving, wherein in an embodiment of the present invention, different reciprocity combinations of transceiving are predefined to correspond to different resources, the different resources have different time-frequency resource locations, each resource, for example, the first resource, includes multiple sets of sub-resources having the same time domain location but different frequency domain locations, the different sub-resources correspond to different predefined optimal downlink beams, and the optimal downlink beams include optimal base station transmit beams and/or optimal terminal receive beams for a downlink. In this way, the terminal determines the position of a first sub-resource corresponding to the first downlink optimal beam in the first resource according to a predetermined first downlink optimal beam comprising the base station optimal transmission beam and/or the terminal optimal reception beam, and then the terminal transmits the preamble on the first sub-resource.
In step 22, the terminal needs to know the downlink optimal transmit beam of the base station and the downlink optimal receive beam of the terminal in advance, which is an implementation manner, in the embodiment of the present invention, the terminal may determine the downlink optimal beam in a manner of receiving predetermined information transmitted by the base station, specifically, the terminal uses a beam scanning manner, and respectively receives the predetermined information transmitted by the base station through each receive beam of the terminal, where the predetermined information is respectively transmitted by the base station through each transmit beam of the base station in the beam scanning manner, and includes at least one of synchronization information, physical broadcast channel information, and system information, and then the terminal determines the base station optimal transmit beam and the terminal optimal receive beam according to a reception result of the predetermined information.
In the above step 22, the transceiver reciprocity combinations include 4 different combinations:
1) when the receiving and sending reciprocity combination is that neither the base station nor the terminal has receiving and sending beam reciprocity, the first resource comprises N groups of sub-resources with the same time domain position but different frequency domain positions, wherein N is equal to the product of the number of base station beams and the number of terminal beams. At this time, the terminal sends a preamble on the first sub-resource, specifically: and the terminal adopts a beam scanning mode on the first sub-resource and respectively transmits the lead codes through each transmission beam of the terminal.
2) When the receiving and transmitting reciprocity combination is that the base station has receiving and transmitting beam reciprocity but the terminal does not have the receiving and transmitting beam reciprocity, the first resource comprises M groups of sub-resources with the same time domain position but different frequency domain positions, wherein M is equal to the number of terminal beams. At this time, the terminal sends a preamble on the first sub-resource, specifically: and the terminal adopts a beam scanning mode on the first sub-resource and respectively sends the lead codes through each sending beam of the terminal.
3) When the receiving and transmitting reciprocity combination is that the base station does not have the receiving and transmitting beam reciprocity but the terminal has the receiving and transmitting beam reciprocity, the first resource comprises L groups of sub-resources with the same time domain position but different frequency domain positions, wherein L is equal to the product of the number of base station beams and the number of terminal beams. At this time, the terminal sends a preamble on the first sub-resource, specifically: and the terminal transmits the lead code through the terminal transmission beam corresponding to the first sub-resource on the first sub-resource.
4) When the receiving and transmitting reciprocity combination is that both the base station and the terminal have receiving and transmitting beam reciprocity, the first resource comprises P groups of sub-resources with the same time domain position but different frequency domain positions, wherein P is equal to the number of terminal beams. At this time, the terminal sends a preamble on the first sub-resource, specifically: and the terminal transmits the lead code through the terminal transmission beam corresponding to the first sub-resource on the first sub-resource.
The cell access method according to the embodiment of the present invention is introduced above, and the following further receives the device implementing the method. Referring to fig. 3, an embodiment of the present invention provides a base station, including:
a first determining unit 31, configured to determine a transceiving reciprocity combination based on which the terminal transmits the preamble, the transceiving reciprocity combination including a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal.
A detecting unit 32, configured to detect the preamble sent by the terminal according to the reciprocity combination of transceiving.
And a second determining unit 33, configured to determine an optimal transceiving beam of the uplink and the downlink according to a detection result of the resource where the preamble is located.
As an implementation manner, the first determining unit is specifically configured to use a preset default transceiving reciprocity combination as the transceiving reciprocity combination based on which the terminal transmits the preamble.
As another implementation manner, the first determining unit is specifically configured to: and determining a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code according to first indication information sent by the base station in advance, wherein the first indication information comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal. At this time, the base station further includes: and the first sending unit is used for broadcasting and sending the first indication information.
As another implementation manner, the first determining unit is specifically configured to: determining a receiving-transmitting reciprocity combination based on which the terminal transmits the lead code according to second indication information sent by the base station in advance and third indication information sent by the terminal explicitly or implicitly; the second indication information comprises a receiving and sending beam reciprocity hypothesis of the base station and indicates the terminal to autonomously select the receiving and sending beam reciprocity hypothesis of the terminal; the third indication information includes a reciprocity assumption of a transmitting/receiving beam of the terminal. At this time, the first determining unit is further configured to: according to a first preamble group to which a preamble sent by a terminal belongs, determining a transmit-receive beam reciprocity hypothesis corresponding to the first preamble group, and obtaining the transmit-receive beam reciprocity hypothesis of the terminal, wherein different preamble groups correspond to different transmit-receive beam reciprocity hypotheses of the terminal.
The base station of the embodiment of the present invention may further include:
and a second sending unit, configured to send, in a beam scanning manner, predetermined information through each sending beam of the base station, where the predetermined information includes at least one of synchronization information, physical broadcast channel information, and system information.
In the foregoing base station of the embodiment of the present invention, the detection unit includes:
a third determining unit, configured to detect a preamble sent by the terminal according to the reciprocity combination, where the third determining unit includes:
a fourth determining unit, configured to determine a location of the first resource corresponding to the transceiving reciprocity combination, where different transceiving reciprocity combinations correspond to different predefined resources, and resources corresponding to different transceiving reciprocity combinations have different time-frequency resource locations;
a receiving unit, configured to detect and receive, on a first resource, a preamble sent by a terminal through each receiving beam of a base station in a beam scanning manner;
the first resource comprises multiple groups of sub-resources with the same time domain position and different frequency domain positions, different sub-resources correspond to different predefined downlink optimal beams, the terminal sends a lead code on the sub-resource corresponding to one of the downlink optimal beams, and the downlink optimal beams comprise downlink base station optimal sending beams and/or terminal optimal receiving beams.
Here, when the reciprocity combination of transceiving is that neither the base station nor the terminal has reciprocity of transceiving beams, the first resource includes N sets of sub-resources having the same time domain position but different frequency domain positions, where N is equal to a product of a number of beams of the base station and a number of beams of the terminal, and the terminal transmits the preamble through each transmission beam of the terminal by using a beam scanning manner on the sub-resource corresponding to one of the downlink optimal beams.
When the receiving and transmitting reciprocity combination is that the base station has receiving and transmitting beam reciprocity but the terminal does not have the receiving and transmitting beam reciprocity, the first resource comprises M groups of sub-resources with the same time domain position but different frequency domain positions, wherein M is equal to the number of terminal beams, and the terminal adopts a beam scanning mode on the sub-resource corresponding to one downlink optimal beam to respectively transmit lead codes through each transmitting beam of the terminal.
And when the receiving and sending reciprocity combination is that the base station does not have the receiving and sending beam reciprocity but the terminal has the receiving and sending beam reciprocity, the first resource comprises L groups of sub-resources with the same time domain position but different frequency domain positions, wherein L is equal to the product of the number of base station beams and the number of terminal beams, and the terminal sends a lead code through a terminal sending beam corresponding to the first sub-resource on one of the sub-resources corresponding to the optimal downlink beam.
When the reciprocity combination of transceiving is that both the base station and the terminal have reciprocity of transceiving beams, the fourth determining unit determines that the first resource includes P groups of sub-resources having the same time domain position but different frequency domain positions, where P is equal to the number of beams of the terminal, and the terminal transmits a preamble through a terminal transmission beam corresponding to the first sub-resource on a sub-resource corresponding to one of the optimal downlink beams.
In the foregoing base station according to the embodiment of the present invention, the second determining unit is specifically configured to determine the optimal transmit-receive beam of the uplink and the downlink according to the following manner:
the optimal transmitting beam of the base station is obtained according to the first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the base station has reciprocity of transmitting and receiving beams and the optimal receiving beam of the base station;
the terminal optimal receiving beam is obtained according to a first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the terminal has reciprocity of receiving and sending beams and the terminal optimal sending beam;
the optimal receiving beam of the base station is determined according to the receiving beam of the base station corresponding to the lead code with the optimal receiving signal quality, or is determined according to the assumption that the base station has reciprocity of receiving and transmitting beams and the optimal transmitting beam of the base station;
the terminal optimal transmission beam is determined based on the terminal reception beam corresponding to the preamble having the optimal reception signal quality, or based on an assumption that the terminal has reciprocity of transmission and reception beams and the terminal optimal reception beam.
For example, when the downlink optimal beam includes both the base station optimal transmission beam and the terminal optimal reception beam, at this time, the second determining unit may be configured to determine, according to the first sub-resource in which the preamble is detected in the first resource location, the first downlink optimal beam corresponding to the first sub-resource, and obtain the base station optimal transmission beam and the terminal optimal reception beam of the downlink; and obtaining the optimal receiving beam of the base station and the optimal transmitting beam of the terminal of the uplink according to the receiving beam of the base station and the transmitting beam of the terminal corresponding to the lead code with the optimal receiving signal quality.
Referring to fig. 4, an embodiment of the present invention provides a terminal, including:
a first determining unit 41, configured to determine a transceiving reciprocity combination based on which the preamble is transmitted, the transceiving reciprocity combination including a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal.
A sending unit 42, configured to send a preamble based on the reciprocity of transceiving combination.
As an implementation manner, the first determining unit is specifically configured to: and combining the default transceiving reciprocity configured in advance as the transceiving reciprocity combination based on which the lead code is transmitted.
As another implementation manner, the first determining unit is specifically configured to: and determining a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code according to first indication information sent by the base station in advance, wherein the first indication information comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal. At this time, the terminal further includes: the first receiving unit is used for receiving the first indication information broadcast and sent by the base station.
As another implementation manner, the first determining unit is specifically configured to: according to second indication information sent by a base station in advance, determining a receiving and sending beam reciprocity hypothesis of the base station, and autonomously selecting the receiving and sending beam reciprocity hypothesis of the terminal to obtain a receiving and sending reciprocity combination based on which the terminal sends the lead code; the second indication information comprises a receiving and sending beam reciprocity hypothesis of the base station and indicates the terminal to autonomously select the receiving and sending beam reciprocity hypothesis of the terminal. In this case, the first determining unit is further configured to: and determining a first preamble group corresponding to the receiving and transmitting beam reciprocity hypothesis of the terminal, and selecting the preamble adopted by the terminal from the first preamble group, wherein different preamble groups correspond to different receiving and transmitting beam reciprocity hypotheses of the terminal.
The above terminal may further include:
a second receiving unit, configured to receive, by using a beam scanning manner, predetermined information sent by a base station through each receiving beam of a terminal, where the predetermined information is sent by the base station through each sending beam of the base station by using the beam scanning manner, and the predetermined information includes at least one of synchronization information, physical broadcast channel information, and system information;
and the second determining unit is used for determining the optimal transmitting beam of the base station and the optimal receiving beam of the terminal according to the receiving result of the preset information.
In the above terminal, the transmitting unit includes:
a third determining unit, configured to determine, based on the reciprocity transceiving combination, a location of a first resource corresponding to the reciprocity transceiving combination, where different reciprocity transceiving combinations correspond to different predefined resources, and resources corresponding to different reciprocity transceiving combinations have different time-frequency resource locations, the first resource includes multiple sets of sub-resources with the same time domain location but different frequency domain locations, different sub-resources correspond to different predefined optimal downlink beams, and the optimal downlink beam includes an optimal base station transmit beam and/or an optimal terminal receive beam of a downlink;
a fourth determining unit, configured to determine, according to a first downlink optimal beam that is predetermined and includes a base station optimal transmit beam and/or a terminal optimal receive beam, a position of a first sub-resource corresponding to the first downlink optimal beam in the first resource;
a sending processing unit, configured to send a preamble on the first sub-resource.
Here, when the reciprocity combination of transceiving is that neither the base station nor the terminal has reciprocity of transceiving beams, the first resource includes N sets of sub-resources having the same time domain position but different frequency domain positions, where N is equal to the product of the number of beams of the base station and the number of beams of the terminal. The sending processing unit is specifically configured to: and respectively transmitting the lead codes through each transmission beam of the terminal by adopting a beam scanning mode on the first sub-resource.
When the receiving and transmitting reciprocity combination is that the base station has receiving and transmitting beam reciprocity but the terminal does not have the receiving and transmitting beam reciprocity, the first resource comprises M groups of sub-resources with the same time domain position but different frequency domain positions, wherein M is equal to the number of terminal beams. The sending processing unit is specifically configured to: and respectively transmitting the lead codes through each transmission beam of the terminal by adopting a beam scanning mode on the first sub-resource.
When the receiving and transmitting reciprocity combination is that the base station does not have the receiving and transmitting beam reciprocity but the terminal has the receiving and transmitting beam reciprocity, the first resource comprises L groups of sub-resources with the same time domain position but different frequency domain positions, wherein L is equal to the product of the number of base station beams and the number of terminal beams. The sending processing unit is specifically configured to: and on the first sub-resource, transmitting a preamble through a terminal transmission beam corresponding to the first sub-resource.
When the receiving and transmitting reciprocity combination is that both the base station and the terminal have receiving and transmitting beam reciprocity, the first resource comprises P groups of sub-resources with the same time domain position but different frequency domain positions, wherein P is equal to the number of terminal beams. The sending processing unit is specifically configured to: and on the first sub-resource, transmitting a preamble through a terminal transmission beam corresponding to the first sub-resource.
The cell access method, the base station and the terminal implementing the method of the embodiment of the invention are respectively introduced above. Next, further by way of a more specific example, a related implementation of the above method of the embodiment of the present invention is illustrated. Hereinafter, the transmission beam is simply referred to as a transmission beam, and the reception beam is simply referred to as a reception beam.
Example 1:
the base station may instruct the terminal through a system message (e.g., NR-PBCH and/or NR-SIB) or other signaling, so that the terminal knows which base station side transmit/receive beam reciprocity hypothesis and which terminal transmit/receive beam reciprocity hypothesis to perform subsequent transmission-access preamble transmission.
The base station indicates the terminal to include 1-bit first field and 2-bit second field:
1) a first field, configured to indicate a reciprocity hypothesis of a transmit-receive beam at a base station side, where an implementation manner of a value of the first field is as follows:
"0": the reciprocity of the receiving and sending wave beams is shown on the base station side;
"1": the base station side does not have the reciprocity of the receiving and transmitting wave beams;
2) a second field, configured to indicate a reciprocity hypothesis of a transmit-receive beam of the terminal, where an implementation method of the value of the second field is as follows:
"00": the terminal has reciprocity of receiving and transmitting beams;
"01": the terminal does not have reciprocity of receiving and transmitting beams;
"10": the method comprises the steps that the terminal autonomously selects to send the subsequent random-access preamble according to the assumption of reciprocity of the transmitting and receiving beams of the terminal, and tells the base station in an implicit or explicit mode, and the assumption adopted when the terminal sends the random-access preamble subsequently.
For example, the terminal selects a reasonable terminal transmit-receive beam reciprocity hypothesis according to its actual situation to perform subsequent random-access preamble transmission, and tells the base station its own selection through the preamble, for example, the preamble is divided into two groups in advance in the standard, wherein selecting the preamble of the first group means that the terminal performs preamble transmission based on the fact that the terminal has transmit-receive beam reciprocity, and if selecting the other group means that the terminal performs preamble transmission based on the fact that the terminal does not have transmit-receive beam reciprocity.
"11": and (5) reserving.
In the above manner, the base station may instruct the terminal on which combination of reciprocity of transmit and receive beams the preamble is to be transmitted.
Example 2:
fig. 5 provides a transmission of a random-access preamble based on an assumption that neither a base station nor a terminal has reciprocity of transceiving beams. As shown in fig. 5, the base station side has 3 beams and the terminal has 2 beams.
The resources shown in fig. 5 corresponding to the combinations, i.e., the resource regions R1_ TRP _ Tx, R2_ TRP _ Tx, and R3_ TRP _ Tx, are defined in advance for the combination of the above assumptions of the reciprocity of the transmission and reception beams.
The resource regions R1_ TRP _ Tx, R2_ TRP _ Tx, R3_ TRP _ Tx occupy the same time resources but occupy different frequency resources, each of which comprises two parts, respectively: resource regions R1_ UE _ Rx and R2_ UE _ Rx. The resource regions R1_ UE _ Rx and R2_ UE _ Rx are each a sub-resource, respectively corresponding to a specific set of downlink optimal beams.
Resource regions R1_ UE _ Rx and R2_ UE _ Rx, which occupy the same time resource but different frequency resources, each of them comprises two parts, respectively: resource regions R1_ UE _ Tx and R2_ UE _ Tx.
Resource regions R1_ UE _ Tx and R2_ UE _ Tx, which occupy the same frequency resources but different time resources, each of them comprising three parts, respectively: resource regions R1_ TRP _ Rx, R2_ TRP _ Rx and R3_ TRP _ Rx, which occupy the same frequency resources but occupy different time resources.
An implicit indication relationship between each resource block and the transceiving beam is given in fig. 5.
In this example, the base station first transmits at least one of PSS, SSS, PBCH, and SIB on its respective transmission beam in a beam scanning manner. The terminal can receive the information in a beam scanning mode, and further determine a downlink optimal beam comprising the optimal base station transmitting beam of the downlink and the optimal terminal receiving beam according to a receiving result.
The terminal determines a sub-resource corresponding to the downlink optimal beam, for example, resource region R1_ UE _ Rx. Then, the terminal transmits the preamble in a beam scanning manner on the resource region R1_ UE _ Rx, for example, transmits on the resources corresponding to the first 3 small rectangular blocks in the resource region R1_ UE _ Rx with transmit beam 1, and transmits on the resources corresponding to the last 3 small rectangular blocks in the resource region R1_ UE _ Rx with transmit beam 2.
A base station side: the base station determines resources corresponding to the combination, i.e., resource regions R1_ TRP _ Tx, R2_ TRP _ Tx, R3_ TRP _ Tx, according to the combination of the assumptions of the reciprocity of the transmit and receive beams. Then, the base station monitors the preamble in the resource regions R1_ TRP _ Tx, R2_ TRP _ Tx, and R3_ TRP _ Tx, and detects the received preamble through each reception beam of the base station in a beam scanning manner.
● if preamble is detected on R1_ TRP _ Tx, it indicates that the optimal base station beam in downlink is TRP _ Tx _ B1, specifically,
■ if preamble is detected on R1_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B1, specifically,
◆ if preamble with the best received signal quality is detected on R1_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B1, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
◆ if preamble with the best received signal quality is detected on R2_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B2, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
■ if preamble is detected on R2_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B2, specifically,
◆ if preamble with the best received signal quality is detected on R1_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B1, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
◆ if preamble with the best received signal quality is detected on R2_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B2, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
●, if preamble is detected on R2_ TRP _ Tx, it indicates that the optimal base station transmit beam in downlink is TRP _ Tx _ B2, and specifically, as above, the optimal terminal receive beam in downlink, the optimal terminal transmit beam in uplink, and the optimal base station receive beam in uplink can be determined.
●, if preamble is detected on R3_ TRP _ Tx, it indicates that the optimal base station transmit beam in downlink is TRP _ Tx _ B3, and specifically, as above, the optimal terminal receive beam in downlink, the optimal terminal transmit beam in uplink, and the optimal base station receive beam in uplink can be determined.
Example 3:
fig. 6 provides a transmission of a random-access preamble based on an assumption that the base station side has transmit-receive beam reciprocity and the terminal has no transmit-receive beam reciprocity. As shown in fig. 6, the base station side still has 3 beams, and the terminal has 2 beams.
In this scenario, multiple resources are not needed for implicitly indicating the optimal base station transmit beam in the downlink, and only a preamble needs to be monitored in a default resource region, where the resource is default for the base station and the terminal or predefined in a standard. For the definition of each resource in fig. 6, reference may be made to similar resources in fig. 5, which is not described herein again.
In this example, the base station monitors the preamble on a standard pre-defined resource region R _ TRP _ Tx, and, in particular,
■ if preamble is detected on R1_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B1, specifically,
◆ if preamble with the best received signal quality is detected on R1_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B1, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
◆ if preamble with the best received signal quality is detected on R2_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B2, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
■ if preamble is detected on R2_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B2, specifically,
◆ if preamble with the best received signal quality is detected on R1_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B1, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
◆ if preamble with the best received signal quality is detected on R2_ UE _ Tx, it indicates that the best terminal beam in uplink is UE _ Tx _ B2, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
● according to the reciprocity of the base station receiving and transmitting beams, the optimal base station receiving beam in the uplink is used as the optimal base station transmitting beam in the downlink.
Example 4:
fig. 7 provides a transmission of a random-access preamble based on an assumption that the base station side has no transmit-receive beam reciprocity and the terminal has transmit-receive beam reciprocity. As shown in fig. 7, the base station side still has 3 beams, and the terminal has 2 beams.
In this scenario, multiple resources are not needed for implicitly indicating the terminal transmit beam with the optimal uplink. For the definition of each resource in fig. 7, reference may be made to the similar resource in fig. 5, which is not described herein again.
The protocol of example 4 describes:
● the base station monitors preamble on resource areas R1_ TRP _ Tx, R2_ TRP _ Tx and R3_ TRP _ Tx,
■ if preamble is detected on R1_ TRP _ Tx, it indicates that the optimal base station beam in downlink is TRP _ Tx _ B1, specifically,
◆ if preamble is detected on R1_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B1, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
◆ if preamble is detected on R2_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B2, specifically,
● if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
● if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
● if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
■, if preamble is detected on R2_ TRP _ Tx, it indicates that the optimal base station transmit beam in downlink is TRP _ Tx _ B2, and specifically, as above, the optimal terminal receive beam in downlink, the optimal terminal transmit beam in uplink, and the optimal base station receive beam in uplink can be determined.
■, if preamble is detected on R3_ TRP _ Tx, it indicates that the optimal base station transmit beam in downlink is TRP _ Tx _ B3, and specifically, as above, the optimal terminal receive beam in downlink, the optimal terminal transmit beam in uplink, and the optimal base station receive beam in uplink can be determined.
●, the optimal terminal receiving beam in the downlink is used as the optimal terminal transmitting beam in the uplink according to the reciprocity of the terminal transmitting and receiving beams.
Example 5:
fig. 8 provides a transmission of a random-access preamble based on an assumption that both the base station and the terminal have reciprocity of transmit and receive beams. As shown in fig. 8, the base station side still has 3 beams, and the terminal has 2 beams.
In this scenario, multiple resources are not required for implicitly indicating the optimal base station transmit beam in the downlink and the optimal terminal transmit beam in the uplink. For the definition of each resource in fig. 8, reference may be made to the similar resource in fig. 5, which is not described herein again.
The protocol of example 5 describes:
● the base station monitors the preamble, specifically,
■ if preamble is detected on R1_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B1, specifically,
◆ if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
◆ if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
◆ if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
■ if preamble is detected on R2_ UE _ Rx, it indicates that the optimal terminal receive beam in downlink is UE _ Rx _ B2, specifically,
◆ if preamble with best received signal quality is detected on R1_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B1;
◆ if preamble with best received signal quality is detected on R2_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B2;
◆ if preamble with best received signal quality is detected on R3_ TRP _ Rx, then the best base station receiving beam in uplink is TRP _ Rx _ B3.
● taking the optimal base station receiving beam in the uplink as the optimal base station transmitting beam in the downlink according to the reciprocity of the base station receiving and transmitting beams; and according to the reciprocity of the receiving and transmitting beams of the terminal, taking the optimal receiving beam of the terminal in the downlink as the optimal transmitting beam of the terminal in the uplink.
In summary, the cell access method, the base station and the terminal provided in the embodiments of the present invention can perform random-access preamble transmission in the PRACH procedure, and can be applied to various situations where the base station side has or does not have reciprocity for receiving and transmitting beams and the terminal has or does not have reciprocity for receiving and transmitting beams, and can effectively support initial cell access based on multiple beams in a 5G system.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (42)

1. A method for cell access, comprising:
the base station determines a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code, wherein the receiving and transmitting reciprocity combination comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal;
the base station detects the lead code sent by the terminal according to the receiving and sending reciprocity combination, and the method comprises the following steps: the base station determines the position of a first resource corresponding to the transceiving reciprocity combination, wherein different transceiving reciprocity combinations correspond to different predefined resources, and the resources corresponding to different transceiving reciprocity combinations have different time-frequency resource positions; the base station detects and receives the lead codes sent by the terminal through each receiving beam of the base station on the first resource in a beam scanning mode; the first resource comprises a plurality of groups of sub-resources with the same time domain position and different frequency domain positions, different sub-resources correspond to different predefined downlink optimal beams, the terminal sends a lead code on the sub-resource corresponding to one of the downlink optimal beams, and the downlink optimal beams comprise downlink base station optimal sending beams and/or terminal optimal receiving beams;
and the base station determines the optimal transceiving wave beams of the uplink and the downlink according to the detection result of the resource where the lead code is located.
2. The method of claim 1, wherein the step of the base station determining a reciprocity of transceiving combination based on which the terminal transmits the preamble comprises: and the base station takes the default transceiving reciprocity combination configured in advance as the transceiving reciprocity combination based on which the terminal sends the lead code.
3. The method of claim 1, wherein the step of the base station determining a reciprocity of transceiving combination based on which the terminal transmits the preamble comprises: and determining a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code according to first indication information sent by the base station in advance, wherein the first indication information comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal.
4. The method of claim 3, wherein prior to the step of determining a transceivedness combination based on which the terminal transmits the preamble, further comprising: the base station broadcasts and transmits the first indication information.
5. The method of claim 1, wherein the step of the base station determining a reciprocity of transceiving combination based on which the terminal transmits the preamble comprises: determining a receiving-transmitting reciprocity combination based on which the terminal transmits the lead code according to second indication information sent by the base station in advance and third indication information sent by the terminal explicitly or implicitly; the second indication information comprises a receiving and sending beam reciprocity hypothesis of the base station and indicates the terminal to autonomously select the receiving and sending beam reciprocity hypothesis of the terminal; the third indication information includes a reciprocity assumption of a transmitting/receiving beam of the terminal.
6. The method of claim 5, wherein the step of the base station determining a reciprocity of transceiving combination based on which the terminal transmits the preamble further comprises: according to a first preamble group to which a preamble sent by a terminal belongs, determining a transmit-receive beam reciprocity hypothesis corresponding to the first preamble group, and obtaining the transmit-receive beam reciprocity hypothesis of the terminal, wherein different preamble groups correspond to different transmit-receive beam reciprocity hypotheses of the terminal.
7. The method according to any of claims 1 to 6, wherein prior to the step of determining a transceivedness combination on which the terminal transmits the preamble, the method further comprises:
the base station adopts a beam scanning mode, and respectively transmits preset information through each transmission beam of the base station, wherein the preset information comprises at least one of synchronous information, physical broadcast channel information and system information.
8. The method of claim 1, wherein when the reciprocity combination indicates that neither the base station nor the terminal has reciprocity for transceiving beams, the first resource comprises N sets of sub-resources with the same time domain position but different frequency domain positions, where N is equal to a product of a number of beams of the base station and a number of beams of the terminal, and the terminal transmits the preamble through each transmission beam of the terminal by using a beam scanning manner on the sub-resource corresponding to one of the optimal downlink beams.
9. The method of claim 1, wherein when the reciprocity combination indicates that the base station has reciprocity for transmit and receive beams but the terminal does not have reciprocity for transmit and receive beams, the first resource comprises M sets of sub-resources with the same time domain position but different frequency domain positions, where M is equal to the number of beams of the terminal, and the terminal transmits the preamble through each transmit beam of the terminal by using a beam scanning manner on the sub-resource corresponding to one of the optimal downlink beams.
10. The method of claim 1, wherein when the reciprocity combination indicates that the base station does not have the reciprocity for transceiving beams but the terminal has the reciprocity for transceiving beams, the first resource comprises L sets of sub-resources with the same time domain position but different frequency domain positions, where L is equal to a product of a number of beams of the base station and a number of beams of the terminal, and the terminal transmits the preamble through a terminal transmission beam corresponding to the sub-resource on the sub-resource corresponding to one of the optimal downlink beams.
11. The method of claim 1, wherein when the reciprocity combination indicates that both the base station and the terminal have reciprocity for transceiving beams, the first resource comprises P groups of sub-resources with the same time domain position and different frequency domain positions, where P is equal to the number of beams of the terminal, and the terminal transmits a preamble through a terminal transmission beam corresponding to one of the sub-resources corresponding to the optimal downlink beams.
12. The method of claim 1, wherein the step of determining the optimal transmit/receive beam of the uplink and downlink according to the detection result of the resource where the preamble is located comprises:
the optimal transmitting beam of the base station is obtained by the base station according to the first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the base station has reciprocity of transmitting and receiving beams and the optimal receiving beam of the base station;
the optimal receiving beam of the terminal is obtained by the base station according to the first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the terminal has reciprocity of receiving and sending beams and the optimal sending beam of the terminal;
the base station optimal receiving beam is determined by the base station according to the base station receiving beam corresponding to the lead code with the optimal receiving signal quality, or the base station optimal receiving beam according to the assumption that the base station has reciprocity of receiving and transmitting beams;
the terminal optimal transmission beam is determined by the base station based on the terminal reception beam corresponding to the preamble with the optimal reception signal quality, or determined based on the assumption that the terminal has reciprocity of transmission and reception beams and the terminal optimal reception beam.
13. A method for cell access, comprising:
the terminal determines a transceiving reciprocity combination based on which the preamble is transmitted, wherein the transceiving reciprocity combination comprises a transceiving beam reciprocity hypothesis of the base station and a transceiving beam reciprocity hypothesis of the terminal;
the terminal sends the lead code based on the receiving and sending reciprocity combination, and the method comprises the following steps:
the terminal determines the position of a first resource corresponding to the transceiving reciprocity combination based on the transceiving reciprocity combination, wherein different transceiving reciprocity combinations correspond to different predefined resources, and the resources corresponding to different transceiving reciprocity combinations have different time-frequency resource positions, the first resource comprises multiple groups of sub-resources with the same time domain position but different frequency domain positions, different sub-resources correspond to different predefined downlink optimal beams, and the downlink optimal beams comprise the optimal base station transmitting beams and/or the optimal terminal receiving beams of a downlink;
the terminal determines the position of a first sub-resource corresponding to the first downlink optimal beam in the first resource according to a predetermined first downlink optimal beam comprising the base station optimal transmission beam and/or the terminal optimal reception beam;
and the terminal sends a preamble on the first sub-resource.
14. The method of claim 13, wherein the step of the terminal determining a transceivedlness combination based on which the preamble is transmitted comprises: and the terminal takes the default transceiving reciprocity combination configured in advance as the transceiving reciprocity combination based on which the lead code is transmitted.
15. The method of claim 13, wherein the step of the terminal determining a transceivedlness combination based on which the preamble is transmitted comprises: the terminal determines a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code according to first indication information which is transmitted by the base station in advance, wherein the first indication information comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal.
16. The method of claim 15, further comprising, prior to the step of determining a transceivability combination based on which to transmit a preamble, the step of: the terminal receives first indication information broadcast and transmitted by the base station.
17. The method of claim 13, wherein the step of the terminal determining a transceivedlness combination based on which the preamble is transmitted comprises: the terminal determines a receiving and sending beam reciprocity hypothesis of the base station according to second indication information sent by the base station in advance, and the terminal autonomously selects the receiving and sending beam reciprocity hypothesis of the terminal to obtain a receiving and sending reciprocity combination based on which the terminal sends the lead code; the second indication information comprises a receiving and sending beam reciprocity hypothesis of the base station and indicates the terminal to autonomously select the receiving and sending beam reciprocity hypothesis of the terminal.
18. The method of claim 17, wherein the terminal determines a transceivedlness combination based on which the preamble is transmitted, further comprising: and determining a first preamble group corresponding to the receiving and transmitting beam reciprocity hypothesis of the terminal, and selecting the preamble adopted by the terminal from the first preamble group, wherein different preamble groups correspond to different receiving and transmitting beam reciprocity hypotheses of the terminal.
19. The method of claim 13, wherein prior to the step of determining a transceivability combination on which to transmit a preamble, the method further comprises:
the method comprises the steps that a terminal receives preset information sent by a base station through each receiving beam of the terminal in a beam scanning mode, wherein the preset information is sent by the base station through each sending beam of the base station in the beam scanning mode and comprises at least one of synchronous information, physical broadcast channel information and system information;
and the terminal determines the optimal transmitting beam of the base station and the optimal receiving beam of the terminal according to the receiving result of the preset information.
20. The method of claim 13, wherein when the reciprocity combination is that neither the base station nor the terminal has reciprocity for transceiving beams, the first resource comprises N sets of sub-resources with the same time domain location but different frequency domain locations, where N is equal to the product of the number of base station beams and the number of terminal beams; the step of the terminal sending the preamble on the first sub-resource includes:
and the terminal adopts a beam scanning mode on the first sub-resource and respectively sends the lead codes through each sending beam of the terminal.
21. The method of claim 13, wherein when the reciprocity combination is the base station has reciprocity for transmit and receive beams but the terminal does not have reciprocity for transmit and receive beams, the first resource comprises M sets of sub-resources with same time domain position but different frequency domain position, where M is equal to the number of terminal beams; the step of the terminal sending the preamble on the first sub-resource includes:
and the terminal adopts a beam scanning mode on the first sub-resource and respectively sends the lead codes through each sending beam of the terminal.
22. The method of claim 13, wherein when the reciprocity combination is that the base station has no reciprocity for transmit and receive beams but the terminal has reciprocity for transmit and receive beams, the first resource comprises L sets of sub-resources with same time domain position but different frequency domain position, where L is equal to the product of the number of base station beams and the number of terminal beams; the step of the terminal sending the preamble on the first sub-resource includes:
and the terminal transmits the lead code through the terminal transmission beam corresponding to the first sub-resource on the first sub-resource.
23. The method of claim 13, wherein when the reciprocity combination is the reciprocity of both the base station and the terminal for transceiving beams, the first resource comprises P sets of sub-resources with the same time domain position but different frequency domain positions, where P is equal to the number of terminal beams; the step of the terminal sending the preamble on the first sub-resource includes:
and the terminal transmits the lead code through the terminal transmission beam corresponding to the first sub-resource on the first sub-resource.
24. A base station, comprising:
a first determining unit, configured to determine a reciprocity of transceiving combination based on which the terminal transmits the preamble, where the reciprocity of transceiving combination includes a reciprocity of transceiving beams assumption of the base station and a reciprocity of transceiving beams assumption of the terminal;
a detection unit, configured to detect a preamble sent by the terminal according to the reciprocity combination of the transceiving;
the second determining unit is used for determining the optimal transceiving wave beams of the uplink and the downlink according to the detection result of the resource where the lead code is located;
the detection unit includes:
a third determining unit, configured to detect a preamble sent by the terminal according to the reciprocity combination, where the third determining unit includes:
a fourth determining unit, configured to determine a location of the first resource corresponding to the transceiving reciprocity combination, where different transceiving reciprocity combinations correspond to different predefined resources, and resources corresponding to different transceiving reciprocity combinations have different time-frequency resource locations;
a receiving unit, configured to detect and receive, on a first resource, a preamble sent by a terminal through each receiving beam of a base station in a beam scanning manner;
the first resource comprises multiple groups of sub-resources with the same time domain position and different frequency domain positions, different sub-resources correspond to different predefined downlink optimal beams, the terminal sends a lead code on the sub-resource corresponding to one of the downlink optimal beams, and the downlink optimal beams comprise downlink base station optimal sending beams and/or terminal optimal receiving beams.
25. The base station of claim 24, wherein the first determining unit is specifically configured to use a pre-configured default reciprocity of transceiving combination as the reciprocity of transceiving combination based on which the terminal transmits the preamble.
26. The base station of claim 24, wherein the first determining unit is specifically configured to: and determining a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code according to first indication information sent by the base station in advance, wherein the first indication information comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal.
27. The base station of claim 26, further comprising:
and the first sending unit is used for broadcasting and sending the first indication information.
28. The base station of claim 24, wherein the first determining unit is specifically configured to: determining a receiving-transmitting reciprocity combination based on which the terminal transmits the lead code according to second indication information sent by the base station in advance and third indication information sent by the terminal explicitly or implicitly; the second indication information comprises a receiving and sending beam reciprocity hypothesis of the base station and indicates the terminal to autonomously select the receiving and sending beam reciprocity hypothesis of the terminal; the third indication information includes a reciprocity assumption of a transmitting/receiving beam of the terminal.
29. The base station of claim 28, wherein the first determining unit is further configured to: according to a first preamble group to which a preamble sent by a terminal belongs, determining a transmit-receive beam reciprocity hypothesis corresponding to the first preamble group, and obtaining the transmit-receive beam reciprocity hypothesis of the terminal, wherein different preamble groups correspond to different transmit-receive beam reciprocity hypotheses of the terminal.
30. The base station of any of claims 24 to 28, further comprising:
and a second sending unit, configured to send, in a beam scanning manner, predetermined information through each sending beam of the base station, where the predetermined information includes at least one of synchronization information, physical broadcast channel information, and system information.
31. The base station of claim 24, wherein the second determining unit is specifically configured to determine the optimal transceiving beams for the uplink and the downlink according to the following manners:
the optimal transmitting beam of the base station is obtained according to the first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the base station has reciprocity of transmitting and receiving beams and the optimal receiving beam of the base station;
the terminal optimal receiving beam is obtained according to a first downlink optimal beam corresponding to the first sub-resource of the detected lead code, or is determined according to the assumption that the terminal has reciprocity of receiving and sending beams and the terminal optimal sending beam;
the optimal receiving beam of the base station is determined according to the receiving beam of the base station corresponding to the lead code with the optimal receiving signal quality, or is determined according to the assumption that the base station has reciprocity of receiving and transmitting beams and the optimal transmitting beam of the base station;
the terminal optimal transmission beam is determined based on the terminal reception beam corresponding to the preamble having the optimal reception signal quality, or based on an assumption that the terminal has reciprocity of transmission and reception beams and the terminal optimal reception beam.
32. A terminal, comprising:
a first determining unit configured to determine a reciprocity of transceiving combination based on which the preamble is transmitted, the reciprocity of transceiving combination including a reciprocity of transceiving beams assumption of a base station and a reciprocity of transceiving beams assumption of a terminal;
a transmitting unit, configured to transmit a preamble based on the reciprocity combination of transceiving;
the transmission unit includes:
a third determining unit, configured to determine, based on the reciprocity transceiving combination, a location of a first resource corresponding to the reciprocity transceiving combination, where different reciprocity transceiving combinations correspond to different predefined resources, and resources corresponding to different reciprocity transceiving combinations have different time-frequency resource locations, the first resource includes multiple sets of sub-resources with the same time domain location but different frequency domain locations, different sub-resources correspond to different predefined optimal downlink beams, and the optimal downlink beam includes an optimal base station transmit beam and/or an optimal terminal receive beam of a downlink;
a fourth determining unit, configured to determine, according to a first downlink optimal beam that is predetermined and includes a base station optimal transmit beam and/or a terminal optimal receive beam, a position of a first sub-resource corresponding to the first downlink optimal beam in the first resource;
a sending processing unit, configured to send a preamble on the first sub-resource.
33. The terminal of claim 32, wherein the first determining unit is specifically configured to: and combining the default transceiving reciprocity configured in advance as the transceiving reciprocity combination based on which the lead code is transmitted.
34. The terminal of claim 32, wherein the first determining unit is specifically configured to: and determining a receiving and transmitting reciprocity combination based on which the terminal transmits the lead code according to first indication information sent by the base station in advance, wherein the first indication information comprises a receiving and transmitting beam reciprocity hypothesis of the base station and a receiving and transmitting beam reciprocity hypothesis of the terminal.
35. The terminal of claim 34, further comprising:
the first receiving unit is used for receiving the first indication information broadcast and sent by the base station.
36. The terminal of claim 32, wherein the first determining unit is specifically configured to: according to second indication information sent by a base station in advance, determining a receiving and sending beam reciprocity hypothesis of the base station, and autonomously selecting the receiving and sending beam reciprocity hypothesis of the terminal to obtain a receiving and sending reciprocity combination based on which the terminal sends the lead code; the second indication information comprises a receiving and sending beam reciprocity hypothesis of the base station and indicates the terminal to autonomously select the receiving and sending beam reciprocity hypothesis of the terminal.
37. The terminal of claim 36, wherein the first determining unit is further configured to: and determining a first preamble group corresponding to the receiving and transmitting beam reciprocity hypothesis of the terminal, and selecting the preamble adopted by the terminal from the first preamble group, wherein different preamble groups correspond to different receiving and transmitting beam reciprocity hypotheses of the terminal.
38. The terminal of claim 32, further comprising:
a second receiving unit, configured to receive, by using a beam scanning manner, predetermined information sent by a base station through each receiving beam of a terminal, where the predetermined information is sent by the base station through each sending beam of the base station by using the beam scanning manner, and the predetermined information includes at least one of synchronization information, physical broadcast channel information, and system information;
and the second determining unit is used for determining the optimal transmitting beam of the base station and the optimal receiving beam of the terminal according to the receiving result of the preset information.
39. The terminal of claim 32, wherein when the reciprocity combination is that neither the base station nor the terminal has reciprocity for transceiving beams, the first resource comprises N sets of sub-resources with the same time domain position but different frequency domain positions, where N is equal to the product of the number of base station beams and the number of terminal beams;
the sending processing unit is specifically configured to: and respectively transmitting the lead codes through each transmission beam of the terminal by adopting a beam scanning mode on the first sub-resource.
40. The terminal of claim 32, wherein when the reciprocity combination is that the base station has reciprocity for transmit and receive beams but the terminal does not have reciprocity for transmit and receive beams, the first resource comprises M sets of sub-resources with the same time domain location but different frequency domain locations, where M is equal to the number of terminal beams;
the sending processing unit is specifically configured to: and respectively transmitting the lead codes through each transmission beam of the terminal by adopting a beam scanning mode on the first sub-resource.
41. The terminal of claim 32, wherein when the reciprocity combination is that the base station has no reciprocity for transmit and receive beams but the terminal has reciprocity for transmit and receive beams, the first resource comprises L sets of sub-resources with same time domain position but different frequency domain position, where L is equal to the product of the number of base station beams and the number of terminal beams;
the sending processing unit is specifically configured to: and on the first sub-resource, transmitting a preamble through a terminal transmission beam corresponding to the first sub-resource.
42. The terminal of claim 32, wherein when the reciprocity combination is the reciprocity of transmit and receive beams by both the base station and the terminal, the first resource comprises P sets of sub-resources with same time domain position and different frequency domain position, where P is equal to the number of terminal beams;
the sending processing unit is specifically configured to: and on the first sub-resource, transmitting a preamble through a terminal transmission beam corresponding to the first sub-resource.
CN201710010434.3A 2017-01-06 2017-01-06 Cell access method, base station and terminal Active CN108282894B (en)

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