CN113170510B - Communication method and device - Google Patents

Communication method and device Download PDF

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Publication number
CN113170510B
CN113170510B CN201980079636.0A CN201980079636A CN113170510B CN 113170510 B CN113170510 B CN 113170510B CN 201980079636 A CN201980079636 A CN 201980079636A CN 113170510 B CN113170510 B CN 113170510B
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carrier
random access
coverage enhancement
enhancement level
subcarrier
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CN113170510A (en
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罗之虎
单宝堃
王宏
金哲
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • 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]

Abstract

A communication method and device, the method includes: the method comprises the steps that terminal equipment receives first configuration information from network equipment, wherein the first configuration information is used for determining first random access resources under a first coverage enhancement level; the terminal equipment determines a second coverage enhancement level; and the terminal equipment sends the first random access lead code to the network equipment according to the second coverage enhancement level and the first random access resource. By adopting the method and the device in the embodiment of the application, the random access of the terminal equipment can be realized.

Description

Communication method and device
This application claims priority from PCT international patent application with application number PCT/CN2019/085375, entitled "a communication method and apparatus", filed by the chinese patent office on 30/04/2019, which is incorporated herein by reference in its entirety.
Technical Field
The present application relates to the field of communications, and in particular, to a communication method and apparatus.
Background
In the scenarios of uplink failure, downlink data transmission, handover, and the like, the network device may send Downlink Control Information (DCI) to the terminal device, where the DCI is used to trigger a random access procedure of the terminal device. For example, the DCI may carry a random access resource, where the random access resource may include a preamble format, a repetition number of a random access preamble, a carrier index, a subcarrier index, and the like. The terminal equipment can execute a random access process according to the random access resource carried in the DCI.
However, in some scenarios, the network device cannot acquire the coverage condition of the terminal device, and the corresponding terminal device cannot determine the number of repetitions of the random access preamble, so that how the terminal device performs the random access is a current research hotspot.
Disclosure of Invention
The embodiment of the application provides a communication method and a communication device, so as to realize random access of terminal equipment.
In a first aspect, a communication method is provided, including: the method comprises the steps that a terminal device receives first configuration information from a network device, wherein the first configuration information is used for determining a first random access resource under a first coverage enhancement level; the terminal equipment determines a second coverage enhancement level; and the terminal equipment sends a first random access preamble to the network equipment according to the second coverage enhancement level and the first random access resource.
As can be seen from the above, in the embodiment of the present application, the terminal device determines the second coverage enhancement level by itself, and as opposed to the network device blindly indicating the coverage enhancement level, the performance of the random access preamble can be ensured. Meanwhile, the network equipment does not need to indicate the coverage enhancement level, and the signaling overhead can be saved.
In one possible design, the first random access resource includes a first subcarrier, and the first configuration information includes at least one of first indication information, second indication information, third indication information, or fourth indication information; wherein the first indication information is used for indicating an index of the first subcarrier, the second indication information is used for indicating a format of the first random access preamble, the third indication information is used for indicating an index of the first carrier, and the fourth indication information is used for indicating the first coverage enhancement level.
In one possible design, the first random access resource includes a first subcarrier, and the first configuration information includes at least one of fifth indication information, sixth indication information, or seventh indication information; the fifth indication information is used for jointly indicating the index of the first subcarrier and the format of the first random access preamble, the sixth indication information is used for indicating the index of the first carrier, and the seventh indication information is used for indicating the first coverage enhancement level.
As can be seen from the above, in the embodiment of the present application, one piece of indication information is used to jointly indicate the index of the first subcarrier and the format of the first random access preamble. Compared with the method, the signaling overhead can be saved by adopting different indication information to respectively indicate the index of the first subcarrier and the format of the first random access preamble.
In one possible design, the first configuration information is carried by a paging message, and the method further includes: and the terminal equipment determines a first carrier according to the carrier where the paging message is positioned.
In a possible design, the terminal device determines a first carrier according to a carrier where the paging message is located, and the following formula is satisfied:
the carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resource), where the modulo represents a modulo operation, and the carrier index of the first carrier refers to an index of the first carrier in the carriers with random access resource; or alternatively
The carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resources of first coverage enhancement level), and the carrier index of the first carrier refers to the index of the first carrier in the carriers with random access resources of first coverage enhancement level.
As can be seen from the above, in the embodiment of the present application, the first carrier is determined according to the preset rule, so that signaling overhead, that is, paging message overhead is saved, and the capacity of the paging message is prevented from being affected. In a possible design, when there is a random access resource of the second coverage enhancement level on the first carrier, the sending, by the terminal device, a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource includes: the terminal equipment determines a first repetition frequency corresponding to a second coverage enhancement level in the first carrier; and the terminal equipment sends the first random access preamble to the network equipment on the first carrier according to the first random access preamble format, wherein the starting subcarrier of the first random access preamble is the first subcarrier, and the repetition number of the first random access preamble is the first repetition number.
In one possible design, when there is no random access resource of the second coverage enhancement level on the first carrier, the sending, by the terminal device, a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource, includes: the terminal equipment determines a second carrier and a second subcarrier; the terminal equipment determines a second repetition frequency corresponding to a second coverage enhancement level in a second carrier; and the terminal equipment sends the first random access lead code to the network equipment on the second carrier according to the first random access lead code format, wherein the starting subcarrier of the first random access lead code is the second subcarrier, and the repetition frequency of the first random access lead code is the second repetition frequency.
The embodiment provides that the scheme is complete when the terminal device switches to the carrier with the second coverage enhancement level.
In one possible design, the terminal device determines the second subcarrier according to at least one of the following conditions: determining a subcarrier index of the second subcarrier according to an indication value of the first indication information or an indication value of the fifth indication information; and selecting one subcarrier from subcarriers corresponding to the second coverage enhancement level as the second subcarrier in the second carrier.
In one possible design, when there is no random access resource of the second coverage enhancement level on the first carrier, the sending, by the terminal device, a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource, includes: the terminal equipment determines a second carrier; the terminal equipment determines that the repetition frequency corresponding to the second coverage enhancement level in the second carrier is a second repetition frequency; and the terminal equipment sends the first random access preamble to the network equipment on the first carrier according to the first random access preamble format, wherein the starting subcarrier of the first random access preamble is the first subcarrier, and the repetition frequency of the first random access preamble is the second repetition frequency.
The embodiment provides a way for determining the number of repetitions corresponding to the second coverage enhancement level without switching carriers by the terminal device, which can reduce network resource overhead and avoid reserving random access resources by the network device at each coverage enhancement level.
In one possible design, the terminal device determines the second carrier according to at least one of the following conditions: a carrier index of the second carrier = (an indication value of the third indication information) modulo (number of carriers with random access resources of the second coverage enhancement level), where modulo denotes a modulo operation, and the carrier index of the second carrier refers to an index in the carrier with random access resources of the second coverage enhancement level: a carrier index of the second carrier = (an indication value of the sixth indication information) modulo (number of carriers having random access resources of second coverage enhancement level), where modulo represents a modulo operation, and the carrier index of the second carrier refers to an index in the carriers having random access resources of the second coverage enhancement level: the second carrier is an anchor carrier; the second carrier is the Xth carrier in the carriers of the random access resources with the second coverage enhancement level, X is a preset value, and X is a positive integer; and randomly selecting one carrier from the carriers of the random access resources with the second coverage enhancement grade as the second carrier according to the selection probability.
In one possible design, the first random access resource includes a preamble sequence, and the first configuration information includes at least one of eighth indication information, ninth indication information, tenth indication information, or eleventh indication information; the eighth indication information is used for indicating a preamble index of the first random access preamble, and the preamble index is used for determining a preamble sequence of the first random access preamble; the ninth indication information is used for indicating a mask index of the first random access preamble, and the mask index is used for determining a time domain resource of the first random access preamble; the tenth indication information is used for indicating resource block allocation information where the first random access preamble is located, and the resource block allocation information is used for determining frequency domain resources of the first random access preamble; the eleventh indication information is used to indicate a first coverage enhancement level.
In one possible design, the terminal device receives first configuration information from a network device, including: the terminal equipment receives a paging message from network equipment, wherein the paging message carries the first configuration information, and a time unit for finishing transmission of the paging message is a first time unit; the terminal device sends a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource, and the method includes: and after a second time unit is finished, the terminal equipment sends the first random access preamble to the network equipment according to the second coverage enhancement level and the first random access resource, wherein the second time unit is a kth time unit after the first time unit, and k is a positive integer.
In this embodiment, the paging message carries the first configuration information, and a minimum timing relationship is agreed between the paging message and the first random access preamble, so that it can be ensured that the terminal device has enough time to complete receiving and decoding of the paging message, perform downlink-to-uplink conversion, and prepare the first random access preamble. The minimum time sequence is agreed to be greater than 8 or greater than 6, so that the processing capacity of the terminal equipment is close to that of the stock terminal equipment, and the hardware cost is not increased too much.
In one possible design, the sending, by the terminal device, a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource includes: the terminal equipment determines a second repetition number, wherein the second repetition number is the repetition number corresponding to the second coverage enhancement level; and the terminal equipment repeatedly sends the first random access preamble to the network equipment on the determined time domain resource and frequency domain resource of the first random access preamble, the number of times of sending the first random access preamble is the second number of times of sending the first random access preamble, and the sequence used by the first random access preamble is the preamble sequence.
In one possible design, before the terminal device sends a first random access preamble to the network device according to the second coverage enhancement level and a first random access resource, the method further includes: the terminal equipment determines the starting time for sending the first random access lead code, wherein the starting time corresponds to the starting time for sending a second random access lead code under a first coverage enhancement level; or, the terminal device receives second configuration information from the network device, and determines a start time for sending the first random access preamble according to the second configuration information.
In one possible design, the first coverage enhancement level is a preset coverage enhancement level; or, the first coverage enhancement level is the highest coverage enhancement level configured by the system message on the first carrier; or, the first coverage enhancement level is a lowest coverage enhancement level configured by the system message on the first carrier; alternatively, the first coverage enhancement level is a highest coverage enhancement level determined from a system message.
In a second aspect, a communication method is provided, including: the method comprises the steps that network equipment sends first configuration information to terminal equipment, wherein the first configuration information is used for determining first random access resources under a first coverage enhancement level; and the network equipment receives a first random access lead code sent by the terminal equipment according to the first random access resource.
In one possible design, the first random access resource includes a first subcarrier, and the first configuration information includes at least one of first indication information, second indication information, third indication information, or fourth indication information; wherein the first indication information is used for indicating an index of the first subcarrier, the second indication information is used for indicating a format of the first random access preamble, the third indication information is used for indicating an index of the first carrier, and the fourth indication information is used for indicating the first coverage enhancement level.
In one possible design, the first random access resource includes a first subcarrier, and the first configuration information includes at least one of fifth indication information, sixth indication information, or seventh indication information; the fifth indication information is used for jointly indicating the index of the first subcarrier and the format of the first random access preamble, the sixth indication information is used for indicating the index of the first carrier, and the seventh indication information is used for indicating the first coverage enhancement level.
In a possible design, the first configuration information is carried by a paging message, and a carrier where the paging message is located is used to indicate the first carrier.
In one possible design, a relationship between the carrier where the paging message is located and the first carrier satisfies the following formula:
the carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resource), where the modulo represents a modulo operation, and the carrier index of the first carrier refers to an index of the first carrier in the carriers with random access resource; or alternatively
The carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resources of first coverage enhancement level), and the carrier index of the first carrier refers to the index of the first carrier in the carriers with random access resources of first coverage enhancement level.
As can be seen from the above, in the embodiment of the present application, the first carrier is determined according to the preset rule, which can save signaling overhead, that is, save paging message overhead, and avoid affecting the capacity of the paging message.
In one possible design, the receiving, by the network device, a first random access preamble sent by the terminal device according to the first random access resource includes: the network device receives the first random access preamble sent by the terminal device on the first carrier according to the first random access preamble format, the number of repetitions of the first random access preamble is the number of repetitions corresponding to the second coverage enhancement level in the first carrier, and the starting subcarrier of the first random access preamble is the first subcarrier.
In one possible design, the receiving, by the network device, a first random access preamble sent by the terminal device according to the first random access resource includes: and the network equipment receives the first random access lead code sent by the terminal equipment on a second carrier according to the first random access lead code format, wherein the starting subcarrier of the random access lead code is the second subcarrier, and the repetition frequency of the first random access lead code is the repetition frequency corresponding to a second coverage enhancement level in the second carrier. In one possible design, the second subcarrier satisfies at least one of the following conditions:
a subcarrier index of the second subcarrier is determined according to an indicator value of the first indicator information or an indicator value of the fifth indicator information;
and the second subcarrier is a subcarrier selected by the terminal device from subcarriers corresponding to the second coverage enhancement level in the second carrier.
In one possible design, the receiving, by the network device, a first random access preamble sent by the terminal device according to the first random access resource includes: and the network equipment receives the first random access lead code sent by the terminal equipment on the first carrier according to the first random access lead code format, wherein the starting subcarrier of the random access lead code is the first subcarrier, and the repetition number of the first random access lead code is the repetition number corresponding to the second coverage enhancement level in the second carrier.
In one possible design, the second carrier satisfies at least one of the following conditions:
a carrier index of the second carrier = (an indication value of the third indication information) modulo (number of carriers with random access resources of the second coverage enhancement level), where modulo denotes a modulo operation, and the carrier index of the second carrier refers to an index in the carrier with random access resources of the second coverage enhancement level:
a carrier index of the second carrier = (an indication value of the sixth indication information) modulo (number of carriers having random access resources of a second coverage enhancement level), where modulo denotes a modulo operation, and the carrier index of the second carrier refers to an index in a carrier having random access resources of the second coverage enhancement level:
the second carrier is an anchor carrier;
the second carrier is the Xth carrier in the carriers of the random access resources with the second coverage enhancement level, X is a preset value, and X is a positive integer;
the second carrier is a carrier randomly selected by the terminal device from the carriers of the random access resources with the second coverage enhancement level according to the selection probability.
In one possible design, the first coverage enhancement level is a preset coverage enhancement level; or, the first coverage enhancement level is the highest coverage enhancement level configured by the system message on the first carrier; or, the first coverage enhancement level is the lowest coverage enhancement level configured by the system message on the first carrier; alternatively, the first coverage enhancement level is a highest coverage enhancement level determined from a system message.
In one possible design, the first random access resource includes a preamble sequence, and the first configuration information includes at least one of eighth indication information, ninth indication information, tenth indication information, or eleventh indication information; the eighth indication information is used for indicating a preamble index of the first random access preamble, and the preamble index is used for determining a preamble sequence of the first random access preamble; the ninth indication information is used for indicating a mask index of the first random access preamble, and the mask index is used for determining a time domain resource of the first random access preamble; the tenth indication information is used for indicating resource block allocation information where the first random access preamble is located, and the resource block allocation information is used for determining frequency domain resources of the first random access preamble; the eleventh indication information is used for indicating the first coverage enhancement level.
In one possible design, the receiving, by the network device, a first random access preamble sent by the terminal device according to the blind-detected coverage enhancement level set and the first random access resource includes: and the network equipment receives the first random access lead code sent by the terminal equipment on the determined time domain resource and frequency domain resource of the first random access lead code, wherein the sequence used by the first random access lead code is the lead code sequence, and the repetition number of the first random access lead code is the repetition number corresponding to the second coverage enhancement level.
In one possible design, the sending, by the network device, the first configuration information to the terminal device includes: the network equipment sends a paging message to the terminal equipment, wherein the paging message carries the first configuration information, and a time unit for finishing transmission of the paging message is a first time unit; the network device receives a first random access preamble sent by the terminal device according to the first random access resource, and the method includes: and the network equipment receives a first random access preamble sent by the terminal equipment according to the first random access resource after a second time unit is finished, wherein the second time unit is a kth time unit after the first time unit, and k is a positive integer.
In one possible design, before the network device receives the first random access preamble sent by the terminal device according to the first random access resource, the method further includes: the network equipment determines the starting time for receiving the first random access lead code, wherein the starting time corresponds to the starting time for receiving the first random access lead code under a first coverage enhancement level; or, the network device sends second configuration information to the terminal device, where the second configuration information is used for the terminal device to determine a start time for sending the first random access preamble.
In a third aspect, a communication apparatus is provided, where the apparatus may be a terminal device, an apparatus in a terminal device, or an apparatus capable of being used in cooperation with a terminal device. In one design, the apparatus may include a module corresponding to one or more of the methods/operations/steps/actions described in the first aspect, where the module may be implemented by hardware circuit, software, or a combination of hardware circuit and software. Illustratively, the apparatus may include a transceiver module and a processing module, and the transceiver module and the processing module may perform corresponding functions in any design example of the first aspect, specifically:
a transceiver module, configured to receive first configuration information from a network device, where the first configuration information is used to determine a first random access resource under a first coverage enhancement level condition;
a processing module, configured to determine a second coverage enhancement level, and control the transceiver module to send a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource.
As to the functions of the transceiver module and the processing module, reference is made to the description of the first aspect, and no description is made here.
In a fourth aspect, a communication apparatus is provided, where the apparatus may be a network device, an apparatus in a network device, or an apparatus capable of being used with a network device. In one design, the apparatus may include a module corresponding to one or more of the methods/operations/steps/actions described in the second aspect, where the module may be implemented by hardware circuit, software, or a combination of hardware circuit and software. The apparatus may exemplarily include a transceiver module and a processing module, and the transceiver module and the processing module are configured to perform corresponding functions in any design example of the second aspect, specifically:
a transceiver module, configured to send first configuration information to a terminal device, where the first configuration information is used to determine a first random access resource at a first coverage enhancement level;
and the processing module is used for controlling the transceiver module to receive the first random access preamble sent by the terminal equipment according to the first random access resource.
For the specific functions of the transceiver module and the processing module, reference may be made to the description of the second aspect, and no description is made here.
In a fifth aspect, an embodiment of the present application provides an apparatus, which includes a processor, and is configured to implement the method described in the first aspect. The apparatus may also include a memory to store instructions and/or data. The memory is coupled to the processor, and the processor, when executing the program instructions stored in the memory, may implement the method described in the first aspect above. The apparatus may also include a communication interface for the apparatus to communicate with other devices, such as a transceiver, circuit, bus, module, pin, or other type of communication interface, such as a network device, etc. In one possible arrangement, the apparatus comprises:
a memory for storing program instructions;
a communication interface configured to receive first configuration information from a network device, the first configuration information being used to determine a first random access resource at a first coverage enhancement level;
a processing module, configured to determine a second coverage enhancement level, and control the communication interface to send a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource.
The functions of the processor and the communication interface may refer to the description of the first aspect, and are not described herein again.
In a sixth aspect, an embodiment of the present application provides an apparatus, which includes a processor, and is configured to implement the method described in the second aspect. The apparatus may also include a memory for storing instructions and/or data. The memory is coupled to the processor, and the processor, when executing the program instructions stored in the memory, may implement the method described in the second aspect above. The apparatus may also include a communication interface for the apparatus to communicate with other devices, such as a transceiver, circuit, bus, module, pin, or other type of communication interface, such as terminal devices, etc. In one possible arrangement, the apparatus comprises:
a memory for storing program instructions;
a processor to determine first configuration information.
A communication interface, configured to send first configuration information to a terminal device, where the first configuration information is used to determine a first random access resource at a first coverage enhancement level;
the processing module is further configured to control the communication interface to receive a first random access preamble sent by the terminal device according to the first random access resource.
The functions of the processor and the communication interface may refer to the description of the second aspect, and are not described herein again.
In a seventh aspect, an embodiment of the present application further provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method according to any one of the first aspect, the possible design according to the first aspect, the second aspect, or the possible design according to the second aspect.
In an eighth aspect, an embodiment of the present application further provides a chip system, where the chip system includes a processor and may further include a memory, and is configured to implement the method according to any one of the possible designs of the first aspect, the second aspect, or the second aspect. The chip system may be formed by a chip, and may also include a chip and other discrete devices.
In a ninth aspect, this application further provides a computer program product including instructions that, when run on a computer, cause the computer to perform the method of any one of the first aspect, the possible design of the first aspect, the second aspect, or the possible design of the second aspect.
In a tenth aspect, the present application provides a system, where the system includes the apparatus of the third aspect or the fifth aspect, and the apparatus of the fourth aspect or the sixth aspect.
Drawings
Fig. 1 is a schematic diagram of a communication system provided in an embodiment of the present application;
fig. 2 is a flowchart of a communication method provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a format of a random access preamble provided in an embodiment of the present application;
fig. 4 is a schematic diagram of random access resources of NB-IoT provided in an embodiment of the present application;
fig. 5 is a schematic diagram of random access resources of an eMTC according to an embodiment of the present application;
fig. 6 is a schematic diagram of coverage enhancement level determination provided by the embodiment of the present application;
FIG. 7 is a schematic diagram of a timing relationship provided in the present embodiment;
fig. 8 is a schematic structural diagram of a virtual device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a physical device according to an embodiment of the present application.
Detailed Description
Some communication nouns or terms used in the embodiments of the present application are explained below, and are also included as part of the embodiments of the present application.
1. Terminal device
The terminal device may be referred to as a terminal for short, and is a device with a wireless transceiving function. The terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self driving (self driving), a wireless terminal device in remote medical (remote medical), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in smart city (smart city), a wireless terminal device in smart home (smart home), and may further include a User Equipment (UE), and the like. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a fifth generation (5 g) network in the future, or a terminal device in a Public Land Mobile Network (PLMN) in the future, etc. A terminal device may also be sometimes referred to as a terminal, user Equipment (UE), access terminal device, in-vehicle terminal device, industrial control terminal device, UE unit, UE station, mobile station, remote terminal device, mobile device, UE terminal device, wireless communication device, UE agent, or UE device, etc. The terminal equipment may also be fixed or mobile. The embodiments of the present application do not limit this.
In the embodiment of the present application, the apparatus for implementing the function of the terminal may be a terminal; it may also be a device, such as a system-on-chip, capable of supporting the terminal to implement the function, which may be installed in the terminal. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a terminal is a terminal, and the terminal is a UE as an example, the technical solution provided in the embodiment of the present application is described.
2. Network device
The network device may be an access network device, and the access network device may also be referred to as a Radio Access Network (RAN) device, which is a device providing a wireless communication function for the terminal device. Access network equipment includes, for example but not limited to: next generation base station (gbb) in 5G, evolved node B (eNB), radio Network Controller (RNC), node B (NB), base Station Controller (BSC), base Transceiver Station (BTS), home base station (e.g., home evolved node B, or home node B, HNB), base Band Unit (BBU), transceiving point (TRP), transmitting Point (TP), mobile switching center, and the like. The access network device may also be a wireless controller, a Centralized Unit (CU), and/or a Distributed Unit (DU) in a Cloud Radio Access Network (CRAN) scenario, or the network device may be a relay station, an access point, a vehicle-mounted device, a terminal device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, and the like. The terminal device may communicate with multiple access network devices of different technologies, for example, the terminal device may communicate with an access network device supporting Long Term Evolution (LTE), may communicate with an access network device supporting 5G, and may also perform dual connectivity with an access network device supporting LTE and an access network device supporting 5G. The embodiments of the present application are not limited.
In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device; or may be a device, such as a system-on-chip, capable of supporting the network device to implement the function, and the device may be installed in the network device. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is a network device, and the network device is a base station as an example, which describes the technical solution provided in the embodiment of the present application.
3. Internet of things (Internet of things, ioT)
The internet of things is an internet connected with objects, and a user side in the internet of things is expanded to any object to carry out information exchange and communication between the objects. The internet of things may also be referred to as Machine Type Communications (MTC), and the communicating nodes may also be referred to as MTC terminals.
Typical applications of the internet of things include smart grids, smart agriculture, smart transportation, smart home, environment detection and other aspects. Because the internet of things needs to be applied to various scenes such as outdoors, above-ground, underground and the like, special requirements are put forward on the design of the internet of things:
coverage enhancement: many MTC applications are used in environments with poor coverage, such as electric meters and water meters, which are usually installed indoors or even in basements where wireless network signals are poor, and a coverage enhancement technology is needed to solve the problem.
A large number of low rate devices are supported: the number of MTC devices is much larger than the number of devices communicating between people, but the data packets transmitted are small and not sensitive to latency.
Very low cost: many MTC applications require MTC devices to be available and used at very low cost, enabling large-scale deployment.
Low energy consumption: in most cases, MTC devices are powered by batteries. At the same time, however, in many scenarios MTC is required to be able to be used for more than a decade without requiring battery replacement. This requires MTC devices to be able to operate with very low power consumption.
4. Coverage enhancement
Because the internet of things system needs to support a large coverage area, the scheduling strategies of the network devices are completely different for the terminal devices in different communication environments. For example, the terminal device in the center of the cell has a better wireless channel condition, and the network device can establish a reliable communication link with a smaller power, and can rapidly perform data transmission using the techniques such as large transmission code block, high-order modulation, and carrier bonding. For the terminal equipment at the edge of the cell or in the basement, the wireless channel condition is poor, the network equipment needs to use larger power to establish a reliable communication link, and the data transmission can be completed by using the technologies of small transmission code blocks, low-order modulation, multiple repeated transmission, spread spectrum and the like.
In order to ensure the reliability of communication and save the transmission power of the network, terminal devices with different channel conditions need to be distinguished, so as to facilitate the network devices to perform scheduling. The concept of coverage enhancement level is introduced based on the above. The channel transmission conditions of the terminal devices in the same coverage enhancement level are similar, the network device can adopt similar scheduling parameters for the terminal devices in the same coverage enhancement level, and the control signaling overhead occupied by the scheduling parameters is also similar.
Currently, in a narrowband internet of things (NB-IoT) system, a concept of coverage enhancement level is introduced only for Narrowband Physical Random Access (NPRACH). In an enhanced machine type communication (eMTC) system or a long term evolution machine type communication (LTE-M or LTE-MTC) system, a concept of covering an enhancement level is introduced only for a Physical Random Access Channel (PRACH). The coverage enhancement level may also be referred to as a coverage level or an enhanced coverage level or a repetition number. In the embodiments of the present application, the coverage enhancement level is described as an example. Each random access resource is mapped to a coverage enhancement level, numbered from 0. For an NB-IoT system, the mapping of random access resources and coverage enhancement levels is incremented by the number of repetitions of the NPRACH, which are configured by the network device. For an eMTC or LTE-M or LTE-MTC system, the mapping of random access resources and coverage enhancement levels is increased along with the increasing of the repetition times of the PRACH, and the repetition times of the PRACH are configured through network equipment. For example, in the NB-IoT system, if there are 3 coverage enhancement levels, coverage enhancement level 0, coverage enhancement level 1 and coverage enhancement level 2, respectively. Then NPRACH repetition in the random access resource associated with coverage enhancement level 0 < NPRACH repetition in the random access resource associated with coverage enhancement level 1 < NPRACH repetition in the random access resource associated with coverage enhancement level 2. In the LTE-M or LTE-MTC system, if there are 4 coverage enhancement levels, there are a coverage enhancement level 0, a coverage enhancement level 1, a coverage enhancement level 2, and a coverage enhancement level 3, respectively. Then the PRACH repetition number in the random access resource associated with the coverage enhancement level 0 is less than the PRACH repetition number in the random access resource associated with the coverage enhancement level 1 is less than the PRACH repetition number in the random access resource associated with the coverage enhancement level 2 is less than the PRACH repetition number in the random access resource associated with the coverage enhancement level 3. Where the symbol "<" means less than.
It is noted that the term "transmission" referred to in this application may include the transmission and/or reception of data and/or the transmission and/or reception of control information. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order.
It is to be understood that, in the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b and c can be single or multiple.
Fig. 1 shows one of the communication systems 100 to which the embodiment of the present application is applied. The communication system 100 may include at least one network device 110. Network device 110 may be a device that communicates with a terminal device, such as a base station or base station controller. Each network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area (cell). The network device 110 may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, a base station (nodeB) in a Wideband Code Division Multiple Access (WCDMA) system, an evolved node b (eNB) or eNodeB) in an LTE system, a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or a relay station, an access point, a vehicle-mounted device, a wearable device, and a network device in a future 5G network, for example, a base station (G or NB) or a transceiving Point (PLMN) in a new radio Network (NR), or a public mobile network (PLMN) in a future PLMN, and may also be implemented in a Public Land Mobile Network (PLMN), and the network device is not limited in this application.
The communication system 100 also includes one or more terminal devices 120 located within the coverage area of the network device 110. The terminal device 120 may be mobile or stationary. The terminal equipment 120 may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user equipment. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.
The network device 110 and the terminal device 120 may perform data transmission via an air interface resource, where the air interface resource may include at least one of a time domain resource, a frequency domain resource, and a code domain resource. Specifically, when the network device 110 and the terminal device 120 perform data transmission, the network device 110 may transmit control information to the terminal device 120 through a control channel, such as a Physical Downlink Control Channel (PDCCH), so as to allocate a resource of a data channel, such as a Physical Downlink Shared Channel (PDSCH) or a Physical Uplink Shared Channel (PUSCH), to the terminal device 120. For example, the control information may indicate symbols and/or Resource Blocks (RBs) to which the data channels are mapped, and the network device 110 and the terminal device 120 perform data transmission on the data channels at the allocated time-frequency resources. The data transmission may include downlink data transmission and/or uplink data transmission, where the downlink data (e.g., data carried by PDSCH) transmission may refer to the network device 110 sending data to the terminal device 120, and the uplink data (e.g., data carried by PUSCH) transmission may refer to the terminal device 120 sending data to the network device 110. The data may be generalized data, such as user data, system information, broadcast information, or other information.
Fig. 1 exemplarily shows one network device and one terminal device, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of one network device, which is not limited in this embodiment of the present application.
As shown in fig. 2, a flow of a communication method is provided, where the network device in the flow may be the network device 110 in fig. 1, and the terminal device may be the terminal device 120 in fig. 1, and the flow may be:
s201, a network device sends first configuration information, wherein the first configuration information is used for determining a first random access resource under a first coverage enhancement level. Optionally, the process may further include: a process in which the network device determines the first configuration information.
S202, the terminal equipment receives first configuration information.
The terminal device may determine the first random access resource at the first coverage enhancement level according to the first configuration information. For example, the first configuration information may be a Radio Resource Control (RRC) message or a Medium Access Control (MAC) Control Element (CE), or a system message or a physical layer signaling, downlink Control Information (DCI), or a paging message. Alternatively, the first configuration information may be carried in a Radio Resource Control (RRC) message or a Medium Access Control (MAC) Control Element (CE), a system message, a physical layer signaling, a Downlink Control Information (DCI), a paging message, or the like.
S203, the terminal equipment determines a second coverage enhancement level.
By way of example, the specific implementation process for S203 may be as follows: the terminal device may determine the second coverage enhancement level by comparing a Reference Signal Receiving Power (RSRP) obtained by the measurement with an RSRP threshold value in the broadcast message. It should be noted that the reference signal received power has different names in different communication systems, for example, the reference signal received power in NB-IoT system refers to Narrowband Reference Signal Received Power (NRSRP), and the reference signal received power in eMTC or LTE-M or LTE-MTC or LTE system refers to RSRP.
For example, in the NB-IoT system, at most three coverage enhancement levels can be set, which are coverage enhancement level 0, coverage enhancement level 1, and coverage enhancement level 2, respectively, and two NRSRP threshold values are used, the NRSRP threshold value corresponding to coverage enhancement level 1 may be referred to as NRSRP threshold 1, and the NRSRP threshold value corresponding to coverage enhancement level 2 may be referred to as NRSRP threshold 2. Specifically, the method comprises the following steps:
if the NRSRP measured by the terminal device is smaller than the NRSRP threshold 2, the terminal device determines that the second coverage enhancement level in S203 is the coverage enhancement level 2. Otherwise, if the NRSRP measured by the terminal device is smaller than the NRSRP threshold 1, the terminal device determines that the second coverage enhancement level in S203 is the coverage enhancement level 1. Otherwise, the terminal device determines that the second coverage enhancement level in S203 is the coverage enhancement level 0.
For example, in the eMTC, LTE-M, or LTE-MTC system, at most four coverage enhancement levels may be set, which are respectively a coverage enhancement level 0, a coverage enhancement level 1, a coverage enhancement level 2, and a coverage enhancement level 3, and three RSRP threshold values are used, the RSRP threshold value corresponding to the coverage enhancement level 1 may be referred to as an RSRP threshold 1, the RSRP threshold value corresponding to the coverage enhancement level 2 may be referred to as an RSRP threshold 2, and the RSRP threshold value corresponding to the coverage enhancement level 3 may be referred to as an RSRP threshold 3. Specifically, the method comprises the following steps:
if the RSRP measured by the terminal device is smaller than the RSRP threshold 3, the terminal device determines that the second coverage enhancement level in S203 is the coverage enhancement level 3. Otherwise, if the RSRP measured by the terminal device is less than the RSRP threshold 2, the terminal device determines that the second coverage enhancement level in S203 is the coverage enhancement level 2. Otherwise, if the RSRP measured by the terminal device is smaller than the RSRP threshold 1, the terminal device determines that the second coverage enhancement level in S203 is the coverage enhancement level 1. Otherwise, the terminal device determines that the second coverage enhancement level in S203 is the coverage enhancement level 0.
And S204, the terminal equipment sends a first random access lead code to the network equipment according to the second coverage enhancement level and the first random access resource.
S205, the network equipment receives a first random access lead code sent by the terminal equipment according to the first random access resource.
By way of example, the specific implementation process for the above S205 may be as follows: the method comprises the steps that network equipment determines a blind detection coverage enhancement level set, wherein the blind detection coverage enhancement level set comprises one or more coverage enhancement levels, and any one coverage enhancement level in the blind detection coverage enhancement level set is smaller than or equal to a first coverage enhancement level; and the network equipment receives a first random access lead code sent by the terminal equipment according to the coverage enhancement level set of the blind detection and the first random access resource.
Optionally, the method in the flow illustrated in fig. 2 may further include: a network device sends a first message that may be used to configure a plurality of random access resources, each random access resource mapped to a coverage enhancement level.
For example, for an NB-IoT system, the first message may be SIB2-NB, SIB22-NB, SIB23-NB, or the like, and the first message may include a carrier configuration information list, which may include one or more carrier configuration information, and each carrier configuration information may include multiple sets of random access resources. For example, each carrier configuration information may include 3 sets of random access resources. Each random access resource set respectively corresponds to different coverage enhancement levels. The configuration information of each random access resource set includes frequency domain information, time domain information, preamble repetition times, maximum preamble repetition times, and the like.
For example, for an eMTC system, the first message may be SIB2. The first message may include a plurality of sets of random access resources. Each set of random access resources may include a preamble index, frequency domain information, time domain information, a number of preamble repetitions, a maximum number of preamble repetitions, and the like.
Optionally, the method in the flow illustrated in fig. 2 may further include: the terminal equipment determines the starting time of a first random access lead code, wherein the starting time corresponds to the starting time when the first random access lead code can be sent under a first coverage enhancement level; or, the network device determines the second configuration information, the network device sends the second configuration information, correspondingly, the terminal device receives the second configuration information, and the terminal device determines the start time at which the first random access preamble can be sent according to the second configuration information. It should be noted that the starting time in the embodiment of the present application is only the determined starting time at which the first random access preamble can be sent, and whether the terminal device sends the first random access preamble at the starting time depends on the operation of the terminal device side. For example, the terminal device may transmit the first random access preamble at the start time, or the terminal device may not transmit the first random access preamble at the start time. The embodiments of the present application are not limited.
It can be understood that, in this embodiment of the present application, the first configuration information and the second configuration information may be carried in one message to be sent, or the first configuration information and the second configuration information may be carried in different messages to be sent, or the first configuration information and the second configuration information do not carry in any message, are sent separately, and the like, and the present application is not limited thereto.
Example one
The method shown in fig. 2 may be applied to an NB-IoT system, where the first random access resource may include a first subcarrier, and the first configuration information may include first indication information, second indication information, and third indication information.
The first indication information is used to indicate an index of the first subcarrier, or it may be described that the first indication information is used to indicate that the terminal device transmits the first random access preamble on that subcarrier. The second indication information is used to indicate a format of the first random access preamble code, which may be format 0/1 or format 2, for example, the preamble format 0/1 may be represented by a value 0, and the preamble format 2 may be represented by a value 1. The third indication information is used to indicate the index of the first carrier, or it may be described that the third indication information is used to indicate that the terminal device transmits the first random access preamble on that carrier.
For example, as shown in fig. 3, in an NB-IoT system, a bandwidth of one carrier is set to be 180kHz, one NPRACH preamble occupies one subcarrier, a subcarrier bandwidth of NPRACH preamble format 0/1 (preamble format 0/1) is set to be 3.75kHz, and for NPRACH preamble format 0/1, one carrier can support at most 180/3075=48 NPRACH preambles. The subcarrier bandwidth of NPRACH preamble format 2 is 1.25kHz, and for NPRACH preamble format 2, one carrier can support at most 180/1.25khz =144 NPRACH preambles.
The length of the bits occupied by the first indication information is related to the format of the random access preamble code. For example, when the format of the random access preamble code is 0/1, the field may occupy 6 bits. When the format of the random access preamble is format 2, this field may occupy 8 bits.
Alternatively, the first random access resource may include a first subcarrier, and the first configuration information may include fourth indication information and fifth indication information.
Wherein the fourth indication information is used for jointly indicating the index of the first subcarrier and the format of the first random access preamble. The fifth indication information is used to indicate an index of the first carrier.
As can be seen from the above description, the subcarrier bandwidth is 3.75kHz for the preamble format 0/1, and there are at most 48 subcarriers in one carrier. For preamble format 2, the subcarrier bandwidth is 1.25kHz, and within one carrier, there are a maximum of 144 subcarriers. In an embodiment of the present application, the preamble format may be indicated in association with the subcarrier index. For example, in table 1, the fourth indication information indicates a value I sc When I is sc Can indicate the preamble format 0/1 and the subcarrier index when the value of (2) is 0 to 47, and the value of the subcarrier index is I sc I.e. the value of the subcarrier index may be one of 0 to 47. When I sc Is 48 to 191, preamble format 2 and subcarrier index may be indicated, the subcarrier index having a value of I sc The value of-48, i.e., the subcarrier index, may be one of 48 to 191.
TABLE 1
Fourth indication information (I) sc ) Subcarrier index Format
0-47 I sc Preamble format 0/1
48-191 Isc-48 Preamble format 2
For the first embodiment, a specific implementation of the step S204 may be: the terminal equipment determines a first repetition frequency which is a repetition frequency corresponding to the second coverage enhancement level; and the terminal equipment repeatedly sends the first random access lead code to the network equipment on a first subcarrier in the first carrier according to the first random access lead code format, wherein the number of sending the first random access lead code is the first repetition number.
For example, in this embodiment of the present application, as shown in fig. 4, a carrier configuration information list configured in a first message includes 6 carriers, and indexes of the 6 carriers are sequentially 0 to 5. The carrier index indicated by the first configuration information is 2, and random access resources of 3 coverage enhancement levels are configured on the carrier. The 3 coverage enhancement levels are coverage enhancement level 0, coverage enhancement level 1, and coverage enhancement level 2, respectively. If the coverage enhancement level determined by the terminal device is set to be the coverage enhancement level 0 and the subcarrier index indicated by the first configuration information is set to be 0, the process of the terminal device sending the first random access preamble code may be as described in fig. 4. It is to be understood that, in the example shown in fig. 4, the first random access preamble is exemplified to include 4 symbol groups.
In the embodiment of the present application, taking NB-IoT system as an example, the carrier configuration information list configured by setting the first message includes a plurality of carriers. The index of the carrier indicated by the first configuration information is 2, and the carrier is configured with 3 random access resources covering enhanced levels, and the format of the random access preamble code is format 0/1. Specifically, the random access resources of 3 coverage enhancement levels may include:
the number of repetition times corresponding to the coverage enhancement level 0 is 0, 12 subcarriers are occupied in the frequency domain, and the 12 subcarriers are sequentially numbered from 0 to 11 from low frequency to high frequency;
the number of repetition times corresponding to the coverage enhancement level 1 is 8, 12 subcarriers are occupied in a frequency domain, and the 12 subcarriers are sequentially numbered from 12 to 23 from low frequency to high frequency;
the number of repetitions corresponding to coverage enhancement level 2 is 32, and 24 subcarriers are occupied in the frequency domain, and the 24 subcarriers are numbered 24 to 47 in sequence from low frequency to high frequency.
In the embodiment of the present application, the network device may indicate carrier 2 and subcarrier 36, and as can be seen from the foregoing, the coverage enhancement level corresponding to the subcarrier 36 is coverage enhancement level 2. Then the random access resource corresponding to the coverage enhancement level 2 can be the first random access resource in the process shown in fig. 2. That is, the first random access resource in the procedure shown in fig. 2 may be: the frequency domain occupies 24 sub-carriers, and the 24 sub-carriers are numbered 24 to 47 in sequence from low frequency to high frequency. Coverage enhancement level 2 corresponds to the first coverage enhancement level in the flow of fig. 2 described above.
The terminal device may determine the second coverage enhancement level in the flow shown in fig. 2 in the following manner, and after determining the second coverage enhancement level, may send the random access preamble in the following manner:
if the NRSRP measured by the terminal device is smaller than the NRSRP threshold corresponding to the coverage enhancement level 2, the terminal device determines that the coverage enhancement level of the terminal device is 2, that is, the second coverage enhancement level in the flow shown in fig. 2 is the coverage enhancement level 2. The terminal device determines the NPRACH repetition number as the repetition number corresponding to the coverage enhancement level 2, i.e., 32. The terminal device sends the random access preamble on carrier 2 and subcarrier 36 indicated by the network device according to the repetition number 32.
If the NRSRP measured by the terminal equipment is less than the NRSRP threshold corresponding to the coverage enhancement level 1, the terminal equipment determines that the coverage enhancement level of the terminal equipment is 1. The terminal device determines the NPRACH repetition number as the repetition number corresponding to the coverage enhancement level 1, i.e., 8. The terminal equipment sends the random access preamble on the carrier 2 and the subcarrier 36 indicated by the network equipment according to the repetition number 8. It should be noted that even if the terminal device determines that its coverage enhancement level is 1, some random access parameters used by the coverage enhancement level 2 are still needed to be used when sending the preamble, so as to avoid collision with the random access preamble sent by using the random access resource of the coverage enhancement level 2. Such as certain time domain parameters, periods, start times, etc. Some parameters may use random access parameters corresponding to coverage enhancement level 0, such as maximum number of attempts per random access resource and power control parameters.
And if the RSRP measured by the terminal equipment is not less than the RSRP threshold corresponding to the coverage enhancement level 1, the terminal equipment determines that the coverage enhancement level of the terminal equipment is 0. The terminal device determines the NPRACH repetition number as the repetition number corresponding to the coverage enhancement level 0, i.e., 2. The terminal equipment sends the random access preamble on the carrier 2 and the subcarrier 36 indicated by the network equipment according to the repetition number 2. It should be noted that even if the terminal device determines that its coverage enhancement level is 0, some random access parameters corresponding to the coverage enhancement level 2 still need to be used when sending the preamble, so as to avoid collision with the random access preamble sent by using the random access resource of the coverage enhancement level 2. Such as time domain parameters, periods and start times, etc. Some parameters may use random access parameters corresponding to coverage enhancement level 0, such as maximum number of attempts per random access resource and power control parameters.
In this embodiment, the first random access resource indicated by the network device through the first configuration information may be a contention free random access resource.
Example two
The method shown in fig. 2 may be applied to an eMTC, LTE-M, or LTE-MTC system, where the first random access resource includes a preamble sequence, and the first configuration information may include sixth indication information, seventh indication information, eighth indication information, and ninth indication information. The sixth indication information is used to indicate a preamble index of the first random access preamble, the preamble index being used to determine a preamble sequence of the first random access preamble. The seventh indication information is used to indicate a mask index of the first random access preamble, and the mask index is used to determine a time domain resource of the first random access preamble. The eighth indication information is used for indicating resource block allocation information where the first random access preamble is located, and the resource block allocation information is used for determining frequency domain resources of the first random access preamble. Ninth indication information is used to indicate the first coverage enhancement level.
For the first embodiment, a specific implementation of the step S204 may be: and the terminal equipment determines a second repetition number, wherein the second repetition number is the repetition number corresponding to the second coverage enhancement level. And the terminal equipment repeatedly sends the first random access lead code to the network equipment on the determined time domain resource and frequency domain resource of the first random access lead code, the number of times of sending the first random access lead code is the second number of times of sending the first random access lead code, and the sequence used by the first random access lead code is a lead code sequence.
For example, in the embodiment of the present application, as shown in fig. 5, for an eMTC system, an LTE-M system, or an LTE-MTC system, 4 coverage enhancement levels may be configured, and the numbers are coverage enhancement level 0 to coverage enhancement level 3, respectively. In the coverage enhancement level shown in fig. 5, the longer the length of the transverse rectangular cabinet, the longer the transmission time, i.e., the larger the number of repetitions required. The width of the rectangular cabinet is 6 RBs, i.e. 6 × 180khz. The format of the preamble code can be format 0/1/2/3, the random access preamble code implementation occupies 839 sub-carriers, each sub-carrier has a bandwidth of 1.25kHz, the sequence carried by the random access preamble code can be a ZC sequence, and the random access preamble code can include 64 sequences.
As can be seen from the above, in the embodiment of the present application, the terminal device determines the coverage enhancement level according to the measurement, and the terminal device determines the number of repetitions according to the coverage enhancement level measured by the terminal device. Compared with the scheme that the network equipment blindly indicates the coverage enhancement grade, the method can avoid the uplink interference problem caused by indicating the improper coverage enhancement grade and simultaneously ensure the performance of the random access lead code under the scene that the network equipment cannot obtain the coverage condition of the terminal equipment. Further, in the embodiment of the present application, the network device does not indicate coverage enhancement level information, so that signaling overhead can be saved. Furthermore, the network device allocates random access resources with higher coverage enhancement levels, and does not need to reserve a random access resource for the terminal device in each coverage enhancement level, so that resource reservation can be reduced, and the influence on the capacity of the random access resources can be reduced.
In this embodiment, the first random access resource indicated by the network device through the first configuration information may be a contention free random access resource.
EXAMPLE III
The embodiment of the application provides a communication method, which can realize the random access of terminal equipment. In the NB-IoT system, the random access of the terminal device includes contention-based random access and contention free random access. The method in the embodiment of the application can be applied to random access based on competition and random access based on non-competition. In the following examples, the application to contention-free random access is taken as an example for explanation, and is not intended to limit the present application. The application provides a random access method, which specifically comprises the following steps:
1. the network device sends a first message to the terminal device. The first message is used for configuring a plurality of random access resources, and each random access resource is mapped to one coverage enhancement level. For the first message, reference may be made to the description in the flow shown in fig. 2, and the description is not repeated here.
2. The network equipment sends first configuration information to the terminal equipment, wherein the first configuration information is used for determining first random access resources. For the first configuration information, reference is made to the description of the above embodiments, and the description is not repeated here.
3. The terminal device determines a third coverage enhancement level. The method for determining the third coverage enhancement level by the terminal device is similar to the method for determining the second coverage enhancement level by the terminal device in the above embodiment, and will not be described here.
4. And the terminal equipment determines the random access resource under the third coverage enhancement level according to the first configuration information.
For example, if the subcarrier index indicated in the first configuration information is set as the first subcarrier index, the subcarrier index where the random access resource at the third coverage enhancement level is located determined by the terminal device may be: the first subcarrier index + NumBRA-StartSubcarriers + nprach-SubcarrierOffset. Wherein numcbar-StartSubcarriers indicates the number of subcarriers allocated to the contention based random access. NPRACH-subarrieronoffset indicates the frequency domain position of the first subcarrier of the frequency domain resource allocated to NPRACH. Wherein the NumBRA-StartSubcarriers and nprach-SubcarrirOffset are corresponding configuration parameters at the third coverage enhancement level.
5. And the terminal equipment sends the random access lead code to the network equipment on the determined random access resource according to the repetition times corresponding to the third coverage enhancement level.
For example, in this embodiment of the present application, taking that the index of the carrier indicated by the first configuration information is 4, the carrier is configured with 3 random access resources covering enhancement levels, and the format of the random access preamble code is format 0/1 as an example:
the number of repetition times corresponding to the coverage enhancement level 0 is 2, 12 subcarriers are occupied in a frequency domain, the 12 subcarriers are sequentially numbered from low frequency to high frequency to be 0-11, wherein the subcarrier index for contention-based random access is 0-7, and the subcarrier index for contention-free random access is 8-11;
the number of repetition times corresponding to the coverage enhancement level 1 is 8, 12 subcarriers are occupied in a frequency domain, the 12 subcarriers are sequentially numbered from low frequency to high frequency to be 12-23, wherein the subcarrier index for contention-based random access is 12-19, and the subcarrier index for contention-free random access is 20-23;
the number of repetitions corresponding to coverage enhancement level 2 is 32, 24 subcarriers are occupied in the frequency domain, the 24 subcarriers are numbered from 24 to 47 in sequence from low frequency to high frequency, wherein the subcarrier index for contention-based random access is 24 to 43, and the subcarrier index for contention-free random access is 44 to 47.
For example, the terminal device may measure RSRP and determine the third coverage enhancement level based on the measured RSRP result.
In this embodiment, taking the case that the network device indicates the carrier 4 in the first configuration information and the subcarrier in the contention free resource is 1 as an example, it may be understood that the subcarrier in the contention free resource is 1, which indicates the 2 nd subcarrier in the contention free resource corresponding to each coverage enhancement level in the carrier 4. And the terminal equipment determines the random access resource under the third coverage enhancement level according to the first configuration information. Specific examples are as follows:
and if the RSRP value measured by the terminal equipment is smaller than the RSRP threshold value corresponding to the coverage enhancement grade 2, the terminal equipment determines that the coverage enhancement grade is 2. The terminal device determines the NPRACH repetition number as the repetition number corresponding to the coverage enhancement level 2, i.e., 32. The network device determines that the subcarrier in the contention free resource indicated by the first configuration information is 1, and the terminal device determines that the subcarrier is the 2 nd subcarrier, that is, subcarrier 45, in the contention free random access subcarriers 44 to 47 corresponding to the coverage enhancement level 2 according to the first configuration information. The terminal device may send the random access preamble on carrier 4, subcarrier 45 indicated by the network device, according to the number of repetitions 32.
And if the RSRP value measured by the terminal equipment is smaller than the RSRP threshold value corresponding to the enhanced coverage enhancement grade 1, the terminal equipment determines that the enhanced coverage enhancement grade of the terminal equipment is 1. The terminal device determines the NPRACH repetition number as the repetition number corresponding to the enhanced coverage enhancement level 1, i.e. 8. The network device determines that the subcarrier in the contention free resource indicated by the first configuration information is 1, and the terminal device determines, according to the first configuration information, that the subcarrier is the 2 nd subcarrier, that is, the subcarrier 21, of the subcarriers 20 to 23 corresponding to the coverage enhancement level 1 and used for contention free random access, and then the terminal device sends a random access preamble on the subcarrier 21 and the carrier 4 indicated by the network device according to the repetition number 8.
And if the RSRP value measured by the terminal equipment is not less than the RSRP threshold corresponding to the enhanced coverage enhancement grade 1, the terminal equipment determines that the enhanced coverage enhancement grade of the terminal equipment is 0. The terminal device determines the NPRACH repetition number as the repetition number corresponding to enhanced coverage enhancement level 0, i.e. 2 times. The sub-carrier of the contention-free resource indicated by the first configuration information is 0, the terminal device determines that the sub-carrier is the 2 nd sub-carrier, that is, the sub-carrier 9, of the sub-carriers 8 to 11 corresponding to the coverage enhancement level 0 and used for contention-free random access according to the first configuration information, and then the terminal device sends the random access preamble on the sub-carrier 9 and the carrier 4 indicated by the network device according to the repetition number 2.
In the embodiment of the application, the terminal device determines the coverage enhancement level according to the measurement, and compared with the situation that the network device blindly indicates the coverage enhancement level, the method can avoid the uplink interference problem caused by indicating the improper coverage enhancement level and can ensure the performance of the random access lead code. Meanwhile, the network equipment does not indicate the coverage enhancement level, so that the signaling overhead can be saved.
Example four
In this embodiment of the present application, the first random access resource includes a first subcarrier, and the first configuration information includes at least one of first indication information, second indication information, third indication information, or fourth indication information;
wherein the first indication information is used for indicating an index of the first subcarrier, the second indication information is used for indicating a format of the first random access preamble, the third indication information is used for indicating an index of the first carrier, and the fourth indication information is used for indicating the first coverage enhancement level.
For a specific description of the first indication information, reference may be made to the description of the first indication information in the first embodiment, for a specific description of the second indication information, reference may be made to the description of the second indication information in the first embodiment, and for a specific description of the third indication information, reference may be made to the description of the third indication information in the first embodiment, and a description thereof will not be repeated. The specific indication mode of the fourth indication information may be as follows: indicating a coverage level, or indicating a coverage enhancement level, or indicating an enhanced coverage level, or a repetition level, or a starting number of repetitions, or a random access resource index.
Or, in this embodiment of the present application, the first random access resource includes a first subcarrier, and the first configuration information includes at least one of fifth indication information, sixth indication information, or seventh indication information;
the fifth indication information is used for jointly indicating the index of the first subcarrier and the format of the first random access preamble, the sixth indication information is used for indicating the index of the first carrier, and the seventh indication information is used for indicating the first coverage enhancement level.
For a specific description of the fifth indication information, reference may be made to the description of the fourth indication information in the above second embodiment, and for a specific description of the sixth indication information, reference may be made to the description of the fifth indication information in the above second embodiment, and therefore, no description is given here. The specific indication mode of the seventh indication information may be as follows: indicating a coverage level, or indicating a coverage enhancement level, or indicating an enhanced coverage level, or a repetition level, or a starting number of repetitions, or a random access resource index.
EXAMPLE five
For the first embodiment, a specific implementation of the foregoing S204 may be: when the random access resource of the second coverage enhancement level exists on the first carrier, the terminal equipment determines a first repetition number corresponding to the second coverage enhancement level in the first carrier; the terminal equipment repeatedly sends a first random access lead code to the network equipment on a first carrier according to the first random access lead code format, the number of times of the first random access lead code is a first repetition number, and a starting subcarrier of the first random access lead code is a first subcarrier.
For the first embodiment, a specific implementation of the foregoing S204 may be: when the first carrier does not have the random access resource of the second coverage enhancement level, the terminal equipment determines a second carrier and a second subcarrier; determining a second repetition number corresponding to a second coverage enhancement level in a second carrier; and according to the first random access preamble format, sending a first random access preamble to the network equipment on a second carrier, wherein a starting subcarrier of the first random access preamble is the second subcarrier, and the repetition number of the first random access preamble is the second repetition number.
For the first embodiment, a specific implementation of the step S204 may be: when the random access resource of the second coverage enhancement level does not exist on the first carrier, the terminal equipment determines a second carrier; the terminal equipment determines that the repetition frequency corresponding to the second coverage enhancement level in the second carrier is a second repetition frequency; and the terminal equipment sends the first random access preamble to the network equipment on the first carrier according to the first random access preamble format, wherein the starting subcarrier of the first random access preamble is the first subcarrier, and the repetition frequency of the first random access preamble is the second repetition frequency.
For example, in the embodiment of the present application, the process of determining the second carrier by the terminal device may satisfy at least one of the following conditions:
a carrier index of the second carrier = (an indication value of the third indication information) modulo (where modulo denotes an operation of taking a module) indicates an index in a carrier of a random access resource of the second coverage enhancement level; the indication value of the third indication information may refer to a numerical value indicated by the third indication information.
A carrier index of the second carrier = (the sixth indication information value) modulo (number of carriers with random access resources of the second coverage enhancement level), where modulo denotes a modulo operation, and the carrier index of the second carrier refers to an index in a carrier with random access resources of the second coverage enhancement level; the sixth indication information value may refer to a numerical value indicated by the sixth indication information.
The second carrier is an anchor carrier;
the second carrier is the Xth carrier in the carriers of the random access resources with the second coverage enhancement level, X is a preset value, and X is a positive integer;
and randomly selecting one carrier from the carriers of the random access resources with the second coverage enhancement grade as the second carrier according to the selection probability.
For example, in the embodiment of the present application, the terminal device determines the second subcarrier, and at least one of the following conditions is satisfied:
example one: determining a subcarrier index of the second subcarrier according to an indication value of the first indication information or an indication value of the fifth indication information;
for example, in the embodiment of the present application, the subcarrier index value of the second subcarrier may be:
nprach-subanticrierfset + nprach-numcbar-startsubanticriers + ((indicated value of first indication information) modulo (nprach-numubcarriers-nprach-numcbar-startsubanticriers));
alternatively, the subcarrier index value for the second subcarrier may be
nprach-SubcarrierOffset + nprach-NumBRA-StartSubcarriers + ((indicated value of fifth indication information) modulo (nprach-NumSubcarriers-nprach-NumBRA-StartSubcarriers));
alternatively, the subcarrier index value for the second subcarrier may be
nprach-SubcarrirOffset + nprach-NumBRA-StartSubcarriers + ((indication value of fifth indication-Y) modulo (nprach-NumSubcarriers-nprach-NumBRA-StartSubcarriers)); y is a preset value or Y is related to the preamble format. For example, when the preamble format is format 0/1, Y is 0, and when the preamble format is format 2, Y is 48, or when the preamble format is format 2, Y is 0, and when the preamble format is format 2, Y is 144.
The indication value of the first indication information may indicate a numerical value indicated by the first indication information, and the indication value of the fifth indication information may indicate a numerical value indicated by the fifth indication information. nprach-subantic offset, nprach-numcbar-startsubantic and nprach-numbcarriers are parameters corresponding to the second coverage enhancement level in the second carrier, and the terminal device can obtain the three parameters through the system message in the fourth embodiment described below.
Example two: selecting one subcarrier from subcarriers corresponding to the second coverage enhancement level as the second subcarrier in the second carrier;
in this embodiment, in the present application, "one subcarrier selected from the subcarriers corresponding to the second coverage enhancement level in the second carrier" is randomly selected by the terminal device, where the subcarrier corresponding to the second coverage enhancement level in the second carrier refers to a subcarrier based on contention based random access, and for an NB-IoT system, the subcarrier corresponding to the second coverage enhancement level in the second carrier refers to a subcarrier used for indicating that the terminal device supports multi-tone Msg3, or the subcarrier corresponding to the second coverage enhancement level in the second carrier refers to a subcarrier used for indicating that the terminal device supports single-tone Msg 3. The probability of each of these subcarriers being selected is the same.
In this embodiment, the first indication information may refer to the description of the first indication information in the fourth embodiment, the third indication information may refer to the description of the third indication information in the fourth embodiment, the fifth indication information may refer to the description of the fifth indication information in the fourth embodiment, and the sixth indication information may refer to the description of the sixth indication information in the fourth embodiment.
Accordingly, for the network device side:
by way of example, the specific implementation process for the above S205 may be as follows: the network device receives the first random access preamble sent by the terminal device in the first carrier according to the first random access preamble format, the number of repetitions of the first random access preamble is the number of repetitions corresponding to the second coverage enhancement level in the first carrier, and the starting subcarrier of the first random access preamble is the first subcarrier.
By way of example, the specific implementation process for the above S205 may be as follows: the network device receives the first random access preamble sent by the terminal device in the second carrier according to the first random access preamble format, the number of repetitions of the first random access preamble is the number of repetitions corresponding to a second coverage enhancement level in the second carrier, and a starting subcarrier of the first random access preamble is the second subcarrier.
For example, a specific implementation process for the above S205 may be as follows: and the network equipment receives the first random access preamble sent by the terminal equipment in the first carrier according to the first random access preamble format, wherein the repetition number of the first random access preamble is the repetition number corresponding to the second coverage enhancement level in the second carrier, and the starting subcarrier of the first random access preamble is the first subcarrier.
For the above S205, the network device may be implemented in one manner of the above examples, or may be implemented in two or more manners of the above examples, which is not limited herein.
Wherein the determination process of the second carrier and/or the second subcarrier is the same as the terminal side method in the present embodiment.
It should be noted that, in implementation, if the network device knows the carrier and/or subcarrier on which the terminal device sends the random access preamble, for example, the carrier and/or the subcarrier are specified by the network device or determined by a preset rule, the network device receives the random access preamble sent by the terminal device on the carrier and the subcarrier. If the network device does not know the carrier and/or subcarrier on which the terminal device sends the random access preamble, for example, the carrier and/or the subcarrier is randomly selected by the terminal device through probability in the carrier and/or subcarrier configured by the system message and having the random access resource, and may be equal probability or unequal probability, the network device may receive the first random access preamble sent by the terminal device on the carrier and/or subcarrier configured by the system message and having the random access resource, or the network device determines that the terminal device may send the carrier set and/or subcarrier set of the random access preamble, and then the network device receives the random access preamble sent by the terminal device in the carrier set and/or subcarrier set.
In this embodiment, the first random access resource indicated by the network device through the first configuration information may be a contention-free random access resource.
In the embodiment of the application, the terminal device determines the coverage enhancement level according to the measurement, and compared with the case that the network device indicates the coverage enhancement level blindly, by adopting the method of the application, the uplink interference problem caused by indicating the improper coverage enhancement level can be avoided, and meanwhile, the performance of the random access lead code can be ensured. When the carrier indicated by the network device does not have the coverage level (i.e., the second coverage enhancement level) determined by the terminal device measurement, the embodiment provides a manner that the terminal device switches to the carrier having the second coverage enhancement level to ensure the complete scheme, and simultaneously provides a manner that the terminal device does not switch the carrier and determines the number of times of repetition corresponding to the second coverage enhancement level, which can reduce the network resource overhead and avoid the network device reserving random access resources in each coverage enhancement level.
EXAMPLE six
Optionally, in the flow shown in fig. 2, before S201, the method may further include: the network device sends a system message. Accordingly, the terminal device receives the system message. The system message may be at least one of the following system messages: SIB2-NB, SIB22-NB and SIB23-NB.
For example, the system message may include random access resource configuration information. The terminal equipment can determine the number of the coverage enhancement grades according to the system information. For example in an NB-IoT system, the system message includes the parameter RSRP-thresholdspprachinfolist, which may include two RSRP threshold values. The number of coverage enhancement levels is equal to the RSRP threshold included in the parameter RSRP-threshold prachinfolist plus 1.
Illustratively, the first coverage enhancement level in S201 is the highest coverage enhancement level determined according to the first message. The terminal device may determine the highest coverage level according to the first message, for example, if the terminal device determines that there are 1 coverage enhancement levels according to the first message, the highest coverage enhancement level is a coverage enhancement level 0; if the terminal equipment determines that 2 coverage enhancement grades exist according to the first message, the highest coverage enhancement grade is a coverage enhancement grade 1; if the terminal equipment determines that 3 coverage enhancement grades exist according to the first message, the highest coverage enhancement grade is a coverage enhancement grade 2; if the terminal device determines from the first message that there are 4 coverage enhancement levels, the highest coverage enhancement level is coverage enhancement level 3.
For example, in S201, the first coverage enhancement level is a preset coverage enhancement level, such as a coverage enhancement level 0, a coverage enhancement level 1, a coverage enhancement level 2, a coverage enhancement level 3, or the like.
For example, the first coverage enhancement level in S201 may be a highest enhancement coverage level configured on a first carrier in the system message, where the first carrier is a carrier indicated in the first configuration information.
For example, in S201, the first coverage enhancement level is a lowest enhancement coverage level configured on the first carrier in the first message, and the first carrier is a carrier indicated in the first configuration information.
In this embodiment, the network device does not indicate the coverage enhancement level, and signaling overhead can be saved.
EXAMPLE seven
In an embodiment of the present application, one specific implementation of the foregoing S204 may be: if the first carrier has random access resources of the second coverage enhancement level, the terminal equipment determines a first repetition frequency, wherein the first repetition frequency is a repetition frequency corresponding to the second coverage enhancement level on the first carrier; the terminal equipment sends a first random access lead code to the network equipment on a first carrier according to the first random access lead code format, the repetition frequency of the first random access lead code is a first repetition frequency, and a starting subcarrier of the first random access lead code is a first subcarrier; if the first carrier does not have the random access resource of the second coverage enhancement level, the terminal equipment determines a second carrier and a second subcarrier, and the terminal equipment determines a second repetition number, wherein the second repetition number is the repetition number corresponding to the second coverage enhancement level on the second carrier; and the terminal equipment sends the first random access lead code to the network equipment on a second carrier according to the first random access lead code format, wherein the frequency of the first random access lead code is a second repetition frequency, the initial subcarrier of the first random access lead code is a second subcarrier, and the second carrier is provided with random access resources with a second coverage enhancement level.
It is understood that, in the embodiment of the present application, the number of repetitions corresponding to the second coverage enhancement level on the first carrier may be determined according to the system message in the sixth embodiment described above. The number of repetitions corresponding to the second coverage enhancement level on the second carrier may be determined according to the system message in the sixth embodiment.
For example, in the embodiment of the present application, the terminal device may determine the second carrier according to the indication value of the third indication information and the carrier number of the random access resource of the second coverage enhancement level, or the terminal device may determine the second carrier according to the indication value of the sixth indication information and the carrier number of the random access resource of the second coverage enhancement level. Wherein the number of carriers for the second coverage enhancement level may be determined based on the system message. The carriers with random access resources of the second coverage enhancement level may comprise anchor carriers and/or non-anchor carriers. For example, the carrier index of the second carrier may be determined according to the following equation:
(indication value of third indication information) modulo (number of carriers of random access resources with second coverage enhancement level);
or
(indication value of fifth indication information) modulo (number of carriers of random access resource having second coverage enhancement level);
where modulo denotes a modulo operation. It should be noted that the carrier index herein refers to an index in a carrier having a random access resource of the second coverage enhancement level.
As shown in fig. 6, the network device (eNB) allocates the random access resource according to a first coverage enhancement level, the first coverage enhancement level is CE2, the first carrier is carrier #1, the indication value of the third indication information or the fifth indication information is 1, the terminal device (UE) determines a second coverage enhancement level, the second coverage enhancement level is CE1, CE1 is not present on the carrier #1, the number of carriers of the random access resource having CE1 is 2, that is, carrier #0 and carrier #2, carrier index 0 corresponds to carrier #0, and carrier index 1 corresponds to carrier #2. The UE calculates the carrier index as 1modulo 2=1 according to the above formula, so that the second carrier is carrier #2, and the terminal device transmits the random access preamble on carrier #2 according to the repetition number corresponding to CE 1.
The second subcarrier determination method in this embodiment may refer to the description in the fifth embodiment.
In this embodiment, the first indication information may refer to the description of the first indication information in the fourth embodiment, the third indication information may refer to the description of the third indication information in the fourth embodiment, the fifth indication information may refer to the description of the fifth indication information in the fourth embodiment, and the sixth indication information may refer to the description of the sixth indication information in the fourth embodiment.
In this embodiment, the first random access resource indicated by the network device through the first configuration information may be a contention free random access resource.
Example eight
One specific implementation of S204 may be: if the first carrier has random access resources of the second coverage enhancement level, the terminal equipment determines a first repetition frequency, wherein the first repetition frequency is a repetition frequency corresponding to the second coverage enhancement level on the first carrier; the terminal equipment repeatedly sends a first random access lead code to the network equipment in a first carrier according to the first random access lead code format, wherein the times of the first random access lead code are first repeated times, and a starting subcarrier of the first random access lead code is a first subcarrier; if the first carrier does not have the random access resource of the second coverage enhancement level, the terminal equipment determines a second repetition number, wherein the second repetition number is the repetition number corresponding to the second coverage enhancement level on a third carrier; and the terminal equipment repeatedly sends the first random access lead code to the network equipment in the first carrier according to the first random access lead code format, wherein the frequency of the first random access lead code is the second repetition frequency, the starting subcarrier of the first random access lead code is the first subcarrier, and the third carrier is provided with random access resources with the second coverage enhancement level.
It is to be understood that the number of repetitions corresponding to the second coverage enhancement level on the first carrier may be determined according to the system message in the sixth embodiment. The number of repetitions corresponding to the second coverage enhancement level on the third carrier may be determined according to the system message in the sixth embodiment.
It should be noted that the third carrier is an anchor carrier or an xth carrier in carriers having random access resources of the second coverage level, X is a preset value, and X is a positive integer. The carrier of the random access resource with the second coverage enhancement level may be determined according to the system message in the sixth embodiment, and the number of carriers of the random access resource with the second coverage enhancement level may be determined according to the system message in the sixth embodiment. In this embodiment, the first random access resource indicated by the network device through the first configuration information may be a contention-free random access resource.
Example nine
One specific implementation of S204 may be: if the first carrier has random access resources of the second coverage enhancement level, the terminal equipment determines a first repetition frequency, wherein the first repetition frequency is a repetition frequency corresponding to the second coverage enhancement level on the first carrier; the terminal equipment sends a first random access lead code to the network equipment on a first carrier according to the first random access lead code format, the number of times of the first random access lead code is a first repetition number, and a starting subcarrier of the first random access lead code is a first subcarrier; if the first carrier does not have the random access resource of the second coverage enhancement level, the terminal equipment determines a fourth carrier, and the terminal equipment determines a second repetition number, wherein the second repetition number is the repetition number corresponding to the second coverage enhancement level on the fourth carrier; and the terminal equipment sends the first random access lead code to the network equipment on a fourth carrier according to the first random access lead code format, the frequency of the first random access lead code is the second repetition frequency, the starting subcarrier of the first random access lead code is the fourth subcarrier in the fourth carrier, and the fourth carrier is provided with random access resources of a second coverage enhancement level.
It is to be understood that the number of repetitions corresponding to the second coverage enhancement level on the first carrier may be determined according to the system message in the sixth embodiment. The number of repetitions corresponding to the second coverage enhancement level on the fourth carrier may be determined according to the system message in the sixth embodiment.
For example, in this embodiment of the present application, the fourth carrier is a carrier randomly selected by the terminal device from the carriers of the random access resources with the second coverage enhancement level according to the selection probability. The selection probability may be determined by using NB-IoT technology, that is, the selection probability of the anchor carrier at the second coverage enhancement level is nprach-probabilitylanchor, which may be determined by the first message. The non-anchor carriers with random access resources configured in the first message are equally probable. The selection probability of one non-anchor carrier among the non-anchor carriers with the random access resources configured in the first message is (1-NPRACH-ProhabilityAnchor)/(number of non-anchor NPRACH resources), wherein the number of non-anchor NPRACH resources indicates the number of non-anchor carriers with the random access resources configured in the first message.
Example ten
For example, in the embodiment of the present application, the above S201 may be replaced with: the network equipment sends a paging message, wherein the paging message carries first configuration information, and a time unit for finishing transmission of the paging message is a first time unit. Accordingly, S202 above may be replaced by: the terminal device receives the paging message.
The above S204 may be replaced by: and after the second time unit is finished, the terminal equipment sends a first random access lead code to the network equipment according to the second coverage enhancement level and the first random access resource. Accordingly, S205 described above may be replaced with: and after the second time unit is finished, the network equipment sends a first random access lead code to the network equipment according to the second coverage enhancement level and the first random access resource. The second time unit is the kth time unit after the first time unit, and k is a positive integer.
In this embodiment, the time unit is a superframe, frame, subframe, slot, symbol or sampling point.
In the embodiment of the present application, as shown in fig. 7, the first time unit is taken as a subframe n, and the second time unit is taken as a subframe n + k. It can be seen that the subframe n of the transmission of the paging message is finished, and the terminal device starts to transmit the first random access preamble after the subframe n + k is finished. K is a positive integer greater than 8, for example k can be 9, 10, 11 or 12, etc. Or k is a positive integer greater than 6, for example k can be 7, 8, 9, 10, 11, 12, or the like.
In this embodiment, the paging message carries the first configuration information, and a minimum timing relationship is agreed between the paging message and the first random access preamble, so that it can be ensured that the terminal device has enough time to complete the receiving and decoding of the paging message, the downlink-to-uplink conversion, and the preparation of the first random access preamble. The minimum time sequence is agreed to be greater than 8 or greater than 6, so that the processing capacity of the terminal equipment is close to that of the stock terminal equipment, and the hardware cost is not increased too much.
EXAMPLE eleven
In this embodiment, the first carrier may not be indicated by signaling, that is, the third indication information or the fifth indication information may not be included in the first configuration information. The first configuration information is set to be carried by the paging message, and the first carrier can be determined by the carrier where the paging message is located and the number of carriers with random access resources. Or the first carrier is determined by the carrier where the paging message is located and the number of carriers of the random access resource with the first coverage enhancement level. The carriers with random access resources may include anchor carriers and/or non-anchor carriers. The number of carriers having random access resources can be determined by the system message in the sixth embodiment. The carriers of the random access resources with the first coverage enhancement level may include anchor carriers and/or non-anchor carriers, and the number of the carriers of the random access resources with the first coverage enhancement level may be determined by the system message in the sixth embodiment. The description of the first message is consistent with the foregoing embodiments. For example, the carrier index of the first carrier may be determined according to the following equation:
(index value of carrier where paging message is located) modulo (number of carriers with random access resources);
where modulo denotes a modulo operation. It should be noted that the carrier index herein refers to an index in a carrier having a random access resource. It should be noted that, when the carrier index value of the first carrier is 0, the first carrier represents an anchor carrier, that is, the first carrier is an anchor carrier.
Alternatively, the carrier index of the first carrier may be determined according to the following equation:
(index value of carrier where paging message is located) modulo (number of carriers with random access resources of first coverage enhancement class);
where modulo denotes a modulo operation. It should be noted that the carrier index herein refers to an index in a carrier of a random access resource having a first coverage enhancement level. Similarly, when the carrier index value of the first carrier is 0, the first carrier represents an anchor carrier, that is, the first carrier is an anchor carrier.
In this embodiment, the network device does not indicate the first carrier, which may save signaling overhead.
It is understood that in all the above embodiments, the second coverage enhancement level may be the same as or different from the first coverage enhancement level, and the embodiments of the present application are not limited thereto. In the embodiments of the present application, the different embodiments can be used alone or in combination without limitation. On the premise of no logical contradiction, the embodiments can be referred to each other, for example, embodiment five can refer to the description in embodiment four, embodiment five can refer to the description in embodiment six, embodiment seven to embodiment eleven can refer to the description in embodiment five, and the like.
In the embodiments provided in the present application, the method provided in the embodiments of the present application is introduced from the perspective of network devices, terminals, interaction between the network devices and the terminals, and interaction between the terminals and the terminals, respectively. In order to implement the functions in the method provided by the embodiments of the present application, the network device and the terminal may include a hardware structure and/or a software module, and the functions are implemented in the form of a hardware structure, a software module, or a hardware structure and a software module. Whether any of the above-described functions is implemented as a hardware structure, a software module, or a hardware structure plus a software module depends upon the particular application and design constraints imposed on the technical solution.
Similar to the above concept, as shown in fig. 8, an embodiment of the present application further provides an apparatus 600, which includes a processing module 601 and a transceiver module 602.
In an example, the apparatus 600 is configured to implement the function of the terminal device in the above method. The apparatus may be a terminal device, or an apparatus in a terminal device. Wherein the apparatus may be a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
A transceiver module 602, configured to receive first configuration information from a network device, where the first configuration information is used to determine a first random access resource in a first coverage enhancement level;
a processing module 601, configured to determine a second coverage enhancement level, and control the transceiver module 602 to send a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource.
In this example, as to specific execution procedures of the processing module 601 and the transceiver module 602, reference may be made to the description of the terminal device side in the above method embodiment, and a description thereof will not be provided here.
In another example, the apparatus 600 is configured to implement the functions of the network device in the above-described method. The apparatus may be a network device, or an apparatus in a network device. Wherein the apparatus may be a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
A processing module 601, configured to determine first configuration information; a transceiver module 602, configured to send first configuration information to a terminal device, where the first configuration information is used to determine a first random access resource in a first coverage enhancement level; the processing module 601 is further configured to control the transceiver module 602 to receive a first random access preamble sent by the terminal device according to the first random access resource.
In this example, as to specific execution procedures of the processing module 601 and the transceiver module 602, reference may be made to the description of the network device side in the above method embodiment, and a description thereof is not repeated here.
The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor or module, or may exist alone physically, or two or more modules are integrated in one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
Similar to the above concept, as shown in fig. 9, the present embodiment further provides an apparatus 700.
In an example, the apparatus 700 is configured to implement the function of the terminal device in the foregoing method, and the apparatus may be the terminal device, and may also be an apparatus in the terminal device.
The apparatus 700 includes at least one processor 701 configured to implement the functions of the terminal device in the above-described method. For example, the processor 701 may determine a second coverage enhancement level and control the communication interface 703 to transmit a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource.
The apparatus 700 may also include at least one memory 702 for storing program instructions and/or data. A memory 702 is coupled to the processor 701. The coupling in the embodiments of the present application is a spaced coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, which is used for information interaction between the devices, units or modules. The processor 701 may operate in conjunction with the memory 702. The processor 701 may execute program instructions stored in the memory 702. At least one of the at least one memory may be included in the processor.
Apparatus 700 may also include a communication interface 703 for communicating with other devices over a transmission medium, such that the apparatus used in apparatus 700 may communicate with other devices. Illustratively, the communication interface 703 may be a transceiver, circuit, bus, module, pin, or other type of communication interface, which may be a network device. The processor 701 transceives data using the communication interface 703 and is used to implement the methods in the above-described embodiments.
In this example, as to specific working procedures of the processor 701 and the communication interface 703, reference may be made to the description on the terminal device side in the above method embodiment, and a description thereof is not provided here.
In another example, the apparatus 700 is used to implement the function of the network device in the above method, and the apparatus may be a network device, or an apparatus in a network device.
The apparatus 700 comprises at least one processor 701 configured to implement the functions of the network device in the above-described method. Illustratively, the processor 701 may determine the first configuration information, receive a first random access preamble transmitted by the terminal device according to the first random access resource control communication interface 703.
The apparatus 700 may also include a memory 702 for storing program instructions and/or data. A memory 702 is coupled to the processor 701. The coupling in the embodiments of the present application is a spaced coupling or communication connection between devices, units or modules, and may be in a telecommunication, mechanical or other form, for information interaction between the devices, units or modules. The processor 701 may operate in conjunction with the memory 702. The processor 701 may execute program instructions stored in the memory 702. At least one of the at least one memory may be included in the processor.
Apparatus 700 may also include a communication interface 703 for communicating with other devices over a transmission medium so that the apparatus used in apparatus 700 may communicate with the other devices. Illustratively, the communication interface 703 may be a transceiver, circuit, bus, module, pin, or other type of communication interface, which may be a terminal device. The processor 701 transceives data using the communication interface 703 and is used to implement the methods in the above-described embodiments.
In this example, as to specific working procedures of the processor 701 and the communication interface 703, reference may be made to the description on the network device side in the above method embodiment, and a description thereof is not provided here.
In the embodiment of the present application, the connection medium between the communication interface 703, the processor 701, and the memory 702 is not limited. In the embodiment of the present application, the memory 702, the processor 701 and the communication interface 703 are connected by the bus 704 in fig. 7, the bus is represented by a thick line in fig. 7, and the connection manner between other components is merely schematic illustration and is not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in fig. 7, but this does not represent only one bus or one type of bus.
In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
In the embodiment of the present application, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example. The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.
The method provided by the embodiment of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., an SSD), among others.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
In the embodiments of the present application, the embodiments may be referred to each other, for example, methods and/or terms between the embodiments of the method may be referred to each other, for example, functions and/or terms between the embodiments of the apparatus and the embodiments of the method may be referred to each other, without logical contradictions.

Claims (42)

1. A method of communication, comprising:
the method comprises the steps that terminal equipment receives first configuration information from network equipment, wherein the first configuration information is used for determining first random access resources under a first coverage enhancement level;
the terminal equipment determines a second coverage enhancement level, wherein the first coverage enhancement level is larger than the second coverage enhancement level;
and the terminal equipment sends a first random access lead code to the network equipment according to the second coverage enhancement level and the first random access resource.
2. The method of claim 1, wherein the first random access resource comprises a first subcarrier, and wherein the first configuration information comprises at least one of first indication information, second indication information, third indication information, or fourth indication information;
wherein the first indication information is used for indicating an index of the first subcarrier, the second indication information is used for indicating a format of the first random access preamble, the third indication information is used for indicating an index of the first carrier, and the fourth indication information is used for indicating the first coverage enhancement level.
3. The method of claim 1 or 2, wherein the first configuration information is carried by a paging message, the method further comprising:
and the terminal equipment determines a first carrier according to the carrier where the paging message is positioned.
4. The method of claim 3, wherein the terminal device determines the first carrier according to the carrier on which the paging message is located, and the following formula is satisfied:
a carrier index = (index value of a carrier where a paging message is located) modulo (number of carriers with random access resources), where the modulo represents a modulo operation, and a carrier index of the first carrier refers to an index of the first carrier in carriers with random access resources; or
The carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resources of first coverage enhancement level), and the carrier index of the first carrier refers to the index of the first carrier in the carriers with random access resources of first coverage enhancement level.
5. The method of any of claims 1, 2 and 4, wherein when random access resources of the second coverage enhancement level are available on a first carrier, the terminal device sends a first random access preamble to the network device according to the second coverage enhancement level and the first random access resources, comprising:
the terminal equipment determines a first repetition frequency corresponding to a second coverage enhancement level in the first carrier;
and the terminal equipment sends the first random access lead code to the network equipment on the first carrier according to the first random access lead code format, wherein the starting subcarrier of the first random access lead code is a first subcarrier, and the repetition frequency of the first random access lead code is the first repetition frequency.
6. The method of any of claims 1, 2 and 4, wherein the terminal device sending a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource when there is no random access resource of the second coverage enhancement level on a first carrier, comprising:
the terminal equipment determines a second carrier and a second subcarrier;
the terminal equipment determines a second repetition frequency corresponding to a second coverage enhancement level in a second carrier;
and the terminal equipment sends the first random access lead code to the network equipment on the second carrier according to the first random access lead code format, wherein the starting subcarrier of the first random access lead code is the second subcarrier, and the repetition frequency of the first random access lead code is the second repetition frequency.
7. The method of claim 6, wherein the terminal device determines the second subcarrier if at least one of the following conditions is met:
determining a subcarrier index of the second subcarrier according to an indication value of the first indication information;
and selecting one subcarrier from subcarriers corresponding to the second coverage enhancement level as the second subcarrier in the second carrier.
8. The method of any of claims 1, 2 and 4, wherein the terminal device sending a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource when there is no random access resource of the second coverage enhancement level on a first carrier, comprising:
the terminal equipment determines a second carrier;
the terminal equipment determines that the repetition frequency corresponding to the second coverage enhancement level in the second carrier is a second repetition frequency;
and the terminal equipment sends the first random access lead code to the network equipment on the first carrier according to the first random access lead code format, wherein the starting subcarrier of the first random access lead code is a first subcarrier, and the repetition frequency of the first random access lead code is the second repetition frequency.
9. The method of claim 8, wherein the terminal device determines the second carrier satisfying at least one of the following conditions:
a carrier index of the second carrier = (indication value of third indication information) modulo (number of carriers having random access resources of second coverage enhancement level), where modulo represents a modulo operation, and the carrier index of the second carrier refers to an index in the carrier having the random access resources of the second coverage enhancement level:
the second carrier is an anchor carrier;
the second carrier is the Xth carrier in the carriers of the random access resources with the second coverage enhancement level, X is a preset value, and X is a positive integer;
and randomly selecting one carrier from the carriers of the random access resources with the second coverage enhancement grade as the second carrier according to the selection probability.
10. The method of any one of claims 1, 2, 4, 7 and 9, wherein the first coverage enhancement level is a preset coverage enhancement level; or, the first coverage enhancement level is the highest coverage enhancement level configured by the system message on the first carrier; or, the first coverage enhancement level is a lowest coverage enhancement level configured by the system message on the first carrier; alternatively, the first coverage enhancement level is a highest coverage enhancement level determined from a system message.
11. A method of communication, comprising:
the method comprises the steps that network equipment sends first configuration information to terminal equipment, wherein the first configuration information is used for determining first random access resources under a first coverage enhancement level;
and the network equipment receives a first random access lead code sent by the terminal equipment according to the first random access resource, wherein the first random access lead code is sent according to a second coverage enhancement grade determined by the terminal equipment, and the first coverage enhancement grade is greater than the second coverage enhancement grade.
12. The method of claim 11, wherein the first random access resource comprises a first subcarrier, and wherein the first configuration information comprises at least one of first indication information, second indication information, third indication information, or fourth indication information;
wherein the first indication information is used for indicating an index of the first subcarrier, the second indication information is used for indicating a format of the first random access preamble, the third indication information is used for indicating an index of the first carrier, and the fourth indication information is used for indicating the first coverage enhancement level.
13. The method according to claim 11 or 12, wherein the first configuration information is carried by a paging message, and the carrier where the paging message is located is used to indicate the first carrier.
14. The method of claim 13, wherein the relationship between the carrier on which the paging message is located and the first carrier satisfies the following equation:
the carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resource), where the modulo represents a modulo operation, and the carrier index of the first carrier refers to an index of the first carrier in the carriers with random access resource; or
The carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resources of first coverage enhancement level), and the carrier index of the first carrier refers to the index of the first carrier in the carriers with random access resources of first coverage enhancement level.
15. The method of any one of claims 11, 12 and 14, wherein the network device receiving a first random access preamble transmitted by the terminal device according to the first random access resource comprises:
and the network equipment receives the first random access lead code sent by the terminal equipment on a first carrier according to the first random access lead code format, wherein the repetition frequency of the first random access lead code is the repetition frequency corresponding to the second coverage enhancement level in the first carrier, and the starting subcarrier of the first random access lead code is the first subcarrier.
16. The method of any one of claims 11, 12 and 14, wherein the network device receiving a first random access preamble transmitted by the terminal device according to the first random access resource comprises:
and the network equipment receives the first random access lead code sent by the terminal equipment on a second carrier according to the first random access lead code format, wherein the starting subcarrier of the random access lead code is the second subcarrier, and the repetition frequency of the first random access lead code is the repetition frequency corresponding to a second coverage enhancement level in the second carrier.
17. The method of claim 16, wherein the second subcarrier satisfies at least one of the following conditions:
the subcarrier index of the second subcarrier is determined according to the indicated value of the first indication information;
the second subcarrier is a subcarrier selected by the terminal device from subcarriers corresponding to the second coverage enhancement level in the second carrier.
18. The method of any one of claims 11, 12 and 14, wherein the network device receiving a first random access preamble transmitted by the terminal device according to the first random access resource comprises:
and the network equipment receives the first random access lead code sent by the terminal equipment on a first carrier according to the first random access lead code format, wherein the starting subcarrier of the random access lead code is a first subcarrier, and the repetition frequency of the first random access lead code is the repetition frequency corresponding to a second coverage enhancement level in a second carrier.
19. The method of claim 18, wherein the second carrier satisfies at least one of the following conditions:
a carrier index of the second carrier = (indication value of third indication information) modulo (number of carriers having random access resources of second coverage enhancement level), where modulo represents a modulo operation, and the carrier index of the second carrier refers to an index in the carrier having the random access resources of the second coverage enhancement level:
the second carrier is an anchor carrier;
the second carrier is the Xth carrier in the carriers of the random access resources with the second coverage enhancement level, X is a preset value, and X is a positive integer;
the second carrier is a carrier randomly selected by the terminal device from the carriers of the random access resources with the second coverage enhancement level according to the selection probability.
20. The method of any one of claims 11, 12, 14, 17 and 19, wherein the first coverage enhancement level is a preset coverage enhancement level; or, the first coverage enhancement level is the highest coverage enhancement level configured by the system message on the first carrier; or, the first coverage enhancement level is a lowest coverage enhancement level configured by the system message on the first carrier; alternatively, the first coverage enhancement level is a highest coverage enhancement level determined from a system message.
21. A communications apparatus, comprising:
a transceiver module, configured to receive first configuration information from a network device, where the first configuration information is used to determine a first random access resource at a first coverage enhancement level;
a processing module, configured to determine a second coverage enhancement level, and control the transceiver module to send a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource, where the first coverage enhancement level is greater than the second coverage enhancement level.
22. The apparatus of claim 21, wherein the first random access resource comprises a first subcarrier, the first configuration information comprising at least one of first indication information, second indication information, third indication information, or fourth indication information;
wherein the first indication information is used for indicating an index of the first subcarrier, the second indication information is used for indicating a format of the first random access preamble, the third indication information is used for indicating an index of the first carrier, and the fourth indication information is used for indicating the first coverage enhancement level.
23. The apparatus of claim 21 or 22, wherein the first configuration information is carried by a paging message, and wherein the processing module is further configured to: and determining a first carrier according to the carrier where the paging message is positioned.
24. The apparatus as claimed in claim 23, wherein said processing module, when determining the first carrier according to the carrier on which the paging message is located, satisfies the following formula:
a carrier index = (index value of a carrier where a paging message is located) modulo (number of carriers with random access resources), where the modulo represents a modulo operation, and a carrier index of the first carrier refers to an index of the first carrier in carriers with random access resources; or
The carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resources of first coverage enhancement level), and the carrier index of the first carrier refers to the index of the first carrier in the carriers with random access resources of first coverage enhancement level.
25. The apparatus according to any of claims 21, 22 and 24, wherein when there is a random access resource of the second coverage enhancement level on a first carrier, the processing module, when controlling the transceiver module to transmit a first random access preamble to the network device according to the second coverage enhancement level and the first random access resource, is specifically configured to:
determining a first repetition number corresponding to a second coverage enhancement level in the first carrier;
and according to the first random access preamble format, controlling the transceiver module to send the first random access preamble to the network device on the first carrier, where a starting subcarrier of the first random access preamble is a first subcarrier, and a repetition number of the first random access preamble is the first repetition number.
26. The apparatus as claimed in any one of claims 21, 22 and 24, wherein when there is no random access resource of the second coverage enhancement level on the first carrier, the processing module, when controlling the transceiver module to transmit the first random access preamble to the network device according to the second coverage enhancement level and the first random access resource, is specifically configured to:
determining a second carrier and a second subcarrier;
determining a second repetition number corresponding to a second coverage enhancement level in a second carrier;
and according to the first random access preamble format, sending the first random access preamble to the network equipment on the second carrier, wherein a starting subcarrier of the first random access preamble is the second subcarrier, and the repetition number of the first random access preamble is the second repetition number.
27. The apparatus of claim 26, wherein the processing module, in determining the second subcarrier, at least one of the following conditions is met:
determining a subcarrier index of the second subcarrier according to an indication value of the first indication information;
and selecting one subcarrier from subcarriers corresponding to the second coverage enhancement level as the second subcarrier in the second carrier.
28. The apparatus as claimed in any one of claims 21, 22 and 24, wherein when there is no random access resource of the second coverage enhancement level on the first carrier, the processing module, when controlling the transceiver module to transmit the first random access preamble to the network device according to the second coverage enhancement level and the first random access resource, is specifically configured to:
determining a second carrier;
determining the number of repetitions corresponding to a second coverage enhancement level in the second carrier as a second number of repetitions;
according to the first random access preamble format, the first random access preamble is sent to the network device on the first carrier, a starting subcarrier of the first random access preamble is a first subcarrier, and the number of repetitions of the first random access preamble is the second number of repetitions.
29. The apparatus of claim 28, wherein the processing module determines the second carrier satisfying at least one of the following conditions:
a carrier index of the second carrier = (indication value of third indication information) modulo (number of carriers having random access resources of second coverage enhancement level), where modulo represents a modulo operation, and the carrier index of the second carrier refers to an index in the carrier having the random access resources of the second coverage enhancement level:
the second carrier is an anchor carrier;
the second carrier is the Xth carrier in the carriers of the random access resources with the second coverage enhancement level, X is a preset value, and X is a positive integer;
and randomly selecting one carrier from the carriers of the random access resources with the second coverage enhancement grade as the second carrier according to the selection probability.
30. The apparatus of any one of claims 21, 22, 24, 27 and 29, wherein the first coverage enhancement level is a preset coverage enhancement level; or, the first coverage enhancement level is the highest coverage enhancement level configured by the system message on the first carrier; or, the first coverage enhancement level is a lowest coverage enhancement level configured by the system message on the first carrier; alternatively, the first coverage enhancement level is a highest coverage enhancement level determined from a system message.
31. A communications apparatus, comprising:
a transceiver module, configured to send first configuration information to a terminal device, where the first configuration information is used to determine a first random access resource at a first coverage enhancement level;
a processing module, further configured to control the transceiver module to receive a first random access preamble sent by the terminal device according to the first random access resource, where the first random access preamble is sent according to a second coverage enhancement level, and the first coverage enhancement level is greater than the second coverage enhancement level.
32. The apparatus of claim 31, wherein the first random access resource comprises a first subcarrier, the first configuration information comprising at least one of first indication information, second indication information, third indication information, or fourth indication information;
wherein the first indication information is used for indicating an index of the first subcarrier, the second indication information is used for indicating a format of the first random access preamble, the third indication information is used for indicating an index of the first carrier, and the fourth indication information is used for indicating the first coverage enhancement level.
33. The apparatus according to claim 31 or 32, wherein the first configuration information is carried by a paging message, and the carrier where the paging message is located is used to indicate the first carrier.
34. The apparatus as claimed in claim 33, wherein the relationship between the carrier on which the paging message is located and the first carrier satisfies the following equation:
the carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resource), where the modulo represents a modulo operation, and the carrier index of the first carrier refers to an index of the first carrier in the carriers with random access resource; or
The carrier index of the first carrier = (index value of carrier where paging message is located) modulo (number of carriers with random access resources of first coverage enhancement level), and the carrier index of the first carrier refers to the index of the first carrier in the carriers with random access resources of first coverage enhancement level.
35. The apparatus according to any one of claims 31, 32 and 34, wherein the processing module, when controlling the transceiver module to receive the first random access preamble sent by the terminal device according to the first random access resource, is specifically configured to:
and receiving the first random access preamble sent by the terminal device on a first carrier according to the first random access preamble format, wherein the repetition number of the first random access preamble is the repetition number corresponding to the second coverage enhancement level in the first carrier, and the starting subcarrier of the first random access preamble is the first subcarrier.
36. The apparatus according to any one of claims 31, 32 and 34, wherein the processing module, when controlling the transceiver module to receive the first random access preamble sent by the terminal device according to the first random access resource, is specifically configured to:
and receiving the first random access preamble sent by the terminal equipment on a second carrier according to the first random access preamble format, wherein a starting subcarrier of the random access preamble is a second subcarrier, and the repetition number of the first random access preamble is the repetition number corresponding to a second coverage enhancement level in the second carrier.
37. The apparatus of claim 36, wherein the second subcarrier satisfies at least one of the following conditions:
the subcarrier index of the second subcarrier is determined according to the indicated value of the first indication information;
the second subcarrier is a subcarrier selected by the terminal device from subcarriers corresponding to the second coverage enhancement level in the second carrier.
38. The apparatus according to any one of claims 31, 32 and 34, wherein the processing module, when controlling the transceiver module to receive the first random access preamble sent by the terminal device according to the first random access resource, is specifically configured to:
and receiving the first random access preamble sent by the terminal equipment on a first carrier according to the first random access preamble format, wherein a starting subcarrier of the random access preamble is a first subcarrier, and the repetition number of the first random access preamble is the repetition number corresponding to a second coverage enhancement level in a second carrier.
39. The apparatus of claim 38, wherein the second carrier satisfies at least one of the following conditions:
a carrier index of the second carrier = (an indication value of third indication information) modulo (number of carriers with random access resources of a second coverage enhancement level), where modulo denotes a modulo operation, and the carrier index of the second carrier refers to an index in a carrier with random access resources of the second coverage enhancement level;
the second carrier is an anchor carrier;
the second carrier is the Xth carrier in the carriers of the random access resources with the second coverage enhancement level, X is a preset value, and X is a positive integer;
the second carrier is a carrier randomly selected by the terminal device from the carriers of the random access resources with the second coverage enhancement level according to the selection probability.
40. The apparatus of any one of claims 31, 32, 34, 37, and 39, wherein the first coverage enhancement level is a preset coverage enhancement level; or, the first coverage enhancement level is the highest coverage enhancement level configured by the system message on the first carrier; or, the first coverage enhancement level is a lowest coverage enhancement level configured by the system message on the first carrier; alternatively, the first coverage enhancement level is a highest coverage enhancement level determined from a system message.
41. A communications apparatus comprising a processor and a memory, the memory having stored therein instructions that, when executed by the processor, cause the apparatus to perform the method of any of claims 1 to 20.
42. A computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 20.
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