WO2018177228A1

WO2018177228A1 - Radio communication method, device and system

Info

Publication number: WO2018177228A1
Application number: PCT/CN2018/080400
Authority: WO
Inventors: 刘哲; 杨超斌; 汪永; 高全中; 马瑞泽大卫•简-玛丽; 周国华; 唐浩; 陈卫; 张立文
Original assignee: 华为技术有限公司
Priority date: 2017-03-25
Filing date: 2018-03-24
Publication date: 2018-10-04

Abstract

Disclosed is a radio communication method. The method is executed by a base station, and comprises: transmitting a system message on a downlink carrier, the system message comprising uplink carrier configuration information and preamble transmission configuration information, the uplink carrier configuration information being used to indicate multiple uplink carriers, and the preamble transmission configuration information being used to indicate transmission configuration of a radio access preamble; and after the radio access preamble has been detected on the uplink carrier, setting a radio access response message according to identifier information of the uplink carrier, and transmitting the radio access response message on the downlink carrier.

Description

Wireless communication method, device and system

This application claims the priority of the Chinese patent application filed on March 25, 2017, with the application number of "201710185151.2", and the priority of the Chinese patent application filed on August 11, 2017, with the application number "201710687476.0". The contents of the two Chinese applications are incorporated in this application.

Technical field

The present application relates to the field of communications technologies, and in particular, to a wireless communication method, apparatus, and system. .

Background technique

In a wireless communication system, terminals and networks transmit data to each other based on radio communication technology. However, before transmitting data, the terminal usually needs to access the network first to establish a connection with the network.

Without loss of generality, the connection between the terminal and the network can be abbreviated as the link shown in FIG. The two endpoints of a link are used to characterize two devices that send and receive data. In Figure 1, endpoint A represents a device that enjoys network services, such as a terminal; endpoint B represents a device that provides network services, such as a base station. The connection between these two endpoints is used to characterize the path of data transmission. According to the direction of data transmission, the link is further divided into an uplink (UL) and a downlink (DL). The uplink refers to the link from the terminal to the network, and the downlink refers to the link from the network to the terminal. In Figure 1, the arrow connection from endpoint A to endpoint B shows an uplink, and the arrow connection from endpoint B to endpoint A shows a downlink. Data transmission requires the use of communication resources. The connection of the path of the data transmission is characterized in Figure 1, and may also represent the communication resources occupied by the data transmission on the path.

In the field of radio communication technology, communication resources mainly refer to frequency resources. If the wireless communication system allows simultaneous transmission of data in the uplink and downlink, but requires that the uplink and downlink respectively occupy different frequency ranges to distinguish each other, it is called a frequency division duplex (FDD) system. If the wireless communication system allows the uplink and downlink to occupy the same frequency range, but requires the uplink and downlink to occupy different transmission moments to distinguish each other, it is called a time division duplex (TDD) system.

In order to transmit data to each other, the uplink and downlink between the terminal and the network are indispensable. Moreover, in order to ensure the validity and reliability of data transmission, the uplink and downlink also need to cooperate with each other. Taking data retransmission as an example, the terminal receives data in the downlink. If the data transmission fails, the terminal needs to feedback the transmission status of the data as a failure in the uplink coordinated with the downlink to trigger the base station. Retransmit the data. Correspondingly, after the base station transmits data in the downlink, it also needs to monitor the feedback of the terminal in the uplink coordinated with the downlink. This cooperation between the uplink and the downlink is usually long-term and fixed, also referred to as paired or coupled. At this time, the connection between the terminal and the network can be understood as the uplink and downlink that are paired with each other.

Taking the initial access of the 4th generation (4G) mobile communication Long Term Evolution (LTE) system as an example, after the LTE terminal is powered on, a cell search (cell search) is performed. Stay in the appropriate cell, receive system messages and access the LTE network. Specifically, the LTE terminal first receives a synchronization signal broadcasted in the cell on the downlink frequency of the LTE system, thereby identifying the cell and determining timing and frequency synchronization required for the wireless communication. Next, the LTE terminal receives and decodes the system message broadcasted within the cell, thereby knowing the system parameters required to access the network. Thereafter, the LTE terminal initiates a random access procedure on the uplink frequency of the LTE system to establish a connection with the cell of the network. The downlink frequency of the received synchronization signal and the uplink frequency of the random access is the frequency resources occupied by the uplink and downlink that are paired with each other in the LTE system.

In order to utilize frequency resources reasonably and efficiently, the International Telecommunication Union (ITU) has developed Radio Regulations. The rules have strict provisions on the allocation of the frequency band, the assignment and use of the frequency channel. Therefore, commercial wireless communication systems are generally only allowed to operate in a radio frequency range that complies with ITU regulations. Taking a mobile communication system as an example, a frequency range in which a mobile communication system is authorized to be used is referred to as an authorized spectrum of the mobile communication system. Different mobile communication systems often have different licensed spectrum.

Currently, the operating band of 4G LTE has been specified in the technical specifications of the Third Generation Partnership Project (3GPP). The technical specifications of the 5th generation (5G) mobile communication system are being researched and developed. Compared with 4G, the 5G transmission scheme and working frequency band need to be redesigned. Therefore, the 5G radio technology is referred to as the 5G new radio (NR) in the 3GPP research project, and is sometimes referred to as the 5G new air interface. For example, the working frequency band 1 of 4G LTE includes the uplink working frequency band 1920MHz-1980 MHz and the downlink working frequency band 2110 MHz-2170 MHz. In 5G NR, in order to meet the higher peak rate and system capacity requirements, it is expected to use a working frequency band much higher than 4G LTE. At this stage, the 5G NR candidate licensed spectrum, including the high frequency band of 24.25 GHz to 86 GHz, also known as the millimeter band.

However, signal attenuation in the high frequency band is more serious. If the 5G NR only supports working in the high frequency band, network coverage may be a problem. In addition, considering the scarcity of frequency resources, 5G NR should also support licensed spectrum operating in 4G LTE. In other words, 5G NR and 4G LTE will share the licensed spectrum of 4G LTE. This is referred to as NR-LTE Co-existence in the 3GPP research project. The 5G NR uses the licensed spectrum of 4G LTE to enhance the coverage of the 5G network and improve the resource utilization of the 4G licensed spectrum. Moreover, since some operators may only have 4G licensed spectrum, NR-LTE coexistence is of great significance for the early commercialization of 5G networks. However, NR-LTE coexistence is still only a research framework, and specific technical solutions still require more in-depth exploration and research.

Summary of the invention

The present invention, in conjunction with various embodiments, provides a wireless communication method, apparatus, and system to address one or more deficiencies in the prior art. In particular, the technical solutions provided by the following aspects are used to help establish a connection between a terminal and a base station. Moreover, further combined with some optional technical solutions, a better technical effect can be achieved.

In this application, the carrier is used to indicate a range of frequencies that meet the system specifications. This frequency range can be determined by the center frequency of the carrier (referred to as the carrier frequency) and the bandwidth of the carrier. The set of values of the center frequency and the bandwidth of the carrier are predefined by the system. Unless otherwise stated, multiple carriers refer to multiple different carriers, ie, different frequency ranges. The radio resources managed by the base station may be recorded as one or more downlink carriers, and one or more uplink carriers.

It should be understood that the concept of a carrier can correspond to a serving cell, and can be applied to both a carrier aggregation (CA) scenario and a non-CA scenario. In the CA scenario, the carrier may be a primary component (CC) or a secondary CC. The serving cell in the CA scenario may be a primary cell (PCell) or a secondary cell (SCell). . The downlink carrier can be understood as a resource for downlink transmission, which can be referred to as a downlink resource, including a carrier for downlink transmission or a time division duplex (TDD) in a frequency division duplex (FDD) mode. The part of the carrier in the mode used for downlink transmission. The uplink carrier can be understood as a resource for uplink transmission, which can be referred to as an uplink resource, and includes a carrier for uplink transmission in a frequency division duplex mode or a portion of resources for uplink transmission in a carrier in a time division duplex mode.

In a first aspect, a method for wireless communication is provided, the method being performed by a terminal, including:

Receiving a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information is used to indicate wireless connection The transmission configuration of the preamble;

Transmitting a radio access preamble on the uplink carrier;

A radio access response message is detected on the downlink carrier, thereby determining an uplink carrier indicated by the network.

In a second aspect, a terminal is provided, including:

a receiver, configured to receive a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information a transmission configuration for indicating a radio access preamble;

a transmitter, configured to send a radio access preamble on an uplink carrier;

The processor and the receiver are further configured to detect a radio access response message on the downlink carrier, and thereby determine an uplink carrier indicated by the network.

In a third aspect, a terminal is provided, including:

a receiving module, configured to receive a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information a transmission configuration for indicating a radio access preamble;

a sending module, configured to send a radio access preamble on an uplink carrier;

The processing module and the receiving module are further configured to detect a radio access response message on the downlink carrier, and thereby determine an uplink carrier indicated by the network.

In an optional technical solution, the sending the radio access preamble on the uplink carrier includes:

Transmitting the same radio access preamble on the plurality of uplink carriers; or

Transmitting a radio access preamble on one of the plurality of uplink carriers.

In an optional technical solution, the detecting a radio access response message on the downlink carrier, thereby determining an uplink carrier indicated by the network, includes:

The radio access response message is detected, and the radio access response message includes the identifier information of the uplink carrier, and the uplink carrier identified by the identifier information is determined as the uplink carrier indicated by the network.

The control information of the radio access response message is detected, and the control information includes the identifier information of the uplink carrier, and the uplink carrier identified by the identifier information is determined as the uplink carrier indicated by the network.

In an optional technical solution, the uplink carrier indicated by the network does not belong to the multiple uplink carriers, and the method further includes:

Stop receiving the wireless access response message indicated by the control information.

In an optional technical solution, the uplink carrier indicated by the network belongs to the multiple uplink carriers, and the method further includes:

Transmitting a wireless connection setup request message on the uplink carrier indicated by the network, the wireless connection setup request message being used to request to establish a wireless connection with the network.

The control information of the radio access response message is detected based on the identification information of an uplink carrier, and the uplink carrier is determined as the uplink carrier indicated by the network.

In an optional technical solution, the method further includes:

And receiving, on the downlink carrier, a wireless connection setup complete message, where the wireless connection setup complete message is used to indicate configuration information of the wireless connection between the terminal and the network.

In an optional technical solution, the method further includes:

Determining that the wireless connection with the network is successfully established, where the downlink carrier and the uplink carrier indicated by the network are a downlink primary carrier and an uplink primary carrier, respectively.

After the identification information of all the uplink carriers indicated by the system message is tried, the control information of the radio access response message cannot be detected, thereby determining that the current radio access attempt fails.

A fourth aspect provides a wireless communication method, where the method is performed by a base station, including:

Sending a system message on the downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information is used to indicate wireless connection The transmission configuration of the preamble;

After detecting the radio access preamble on the uplink carrier, setting a radio access response message according to the identifier information of the uplink carrier, and transmitting the radio access response message on the downlink carrier.

In a fifth aspect, a base station is provided, including:

a transmitter, configured to send a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information a transmission configuration for indicating a radio access preamble;

a processor and a receiver, configured to: after detecting the radio access preamble on the uplink carrier, setting a radio access response message according to the identifier information of the uplink carrier;

The transmitter is further configured to send the wireless access response message on a downlink carrier.

In a sixth aspect, a base station is provided, including:

a sending module, configured to send a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information a transmission configuration for indicating a radio access preamble;

a processing module and a receiving module, configured to: after detecting the radio access preamble on the uplink carrier, setting a radio access response message according to the identifier information of the uplink carrier;

The sending module is further configured to send the wireless access response message on a downlink carrier.

In an optional technical solution, determining an uplink carrier in an uplink carrier that detects the same radio access preamble, and setting a radio access response message according to the determined identifier information of the uplink carrier, including:

Detecting a radio access preamble on a plurality of uplink carriers, determining an uplink carrier in an uplink carrier that detects the same radio access preamble, and setting a radio access response message according to the determined identifier information of the uplink carrier;

In an optional technical solution, the setting the radio access response message according to the identifier information of the uplink carrier, including:

The identifier information of the uplink carrier is carried in the radio access response message.

The identifier information of the uplink carrier is carried in the control information of the radio access response message, where the control information is used to indicate the transmission configuration of the radio access response message.

The control information of the radio access response message is scrambled by using the identifier information of the uplink carrier, where the control information is used to indicate a transmission configuration of the radio access response message.

In an optional technical solution, multiple different system messages are sent on multiple downlink carriers;

The plurality of different system messages indicate at least one of the same uplink carriers, but the transmission configurations of the radio access preambles indicated by the plurality of different system messages are different.

In an optional technical solution, the transmission configuration of the radio access preamble indicated by the multiple system messages is different, including one or more of the following situations:

The time domain resources occupied by the radio access preamble indicated by the multiple system messages are different;

The frequency domain resources occupied by the radio access preamble indicated by the multiple system messages are different;

The sets of radio access preambles to which the radio access preambles indicated by the plurality of system messages belong are different.

In an optional technical solution, the sending, by the downlink carrier, the wireless access response message includes:

Determining, according to the detected transmission configuration of the radio access preamble, a system message indicating the transmission configuration of the radio access preamble;

Transmitting the wireless access response message on a downlink carrier that has sent the system message.

In an optional technical solution, the method further includes:

A wireless connection setup request message is received on the determined uplink carrier, the wireless connection setup request message being used to request to establish a wireless connection.

In an optional technical solution, the method further includes:

And transmitting a wireless connection establishment complete message on the downlink carrier, where the wireless connection establishment complete message is used to indicate configuration information of the wireless connection between the terminal and the network.

In an optional technical solution, the system message sent by the base station on one downlink carrier indicates multiple uplink carriers;

The downlink carrier where the system message is located is paired with multiple uplink carriers indicated by the system message.

In an optional technical solution, the base station sends, on multiple downlink carriers, a plurality of different system messages, where the multiple different system messages indicate the same uplink carrier;

The same uplink carrier is paired with multiple downlink carriers where the plurality of different system messages are located

In an optional technical solution, the downlink carrier where the system message is located does not belong to the licensed spectrum of the Long Term Evolution (LTE) system;

Among the plurality of uplink carriers indicated by the system message, at least one uplink carrier belongs to an authorized spectrum of the LTE system.

In a seventh aspect, a terminal is provided, including:

a processor, and a memory coupled to the processor, the program storing program code, wherein when the program code is executed by the processor, the terminal performs the first aspect, the fifteenth aspect, and A method of any one of the sixteenth aspect and its alternative technical solutions.

In an eighth aspect, a processor is provided, comprising:

An interface unit, a processing unit, and a storage unit, wherein the program code is stored in the storage unit, and when the program code is decoded and executed by the processing unit, implementing the first aspect, the fifteenth aspect, and the tenth Any of the six aspects and its alternative technical solutions.

According to a ninth aspect, a computer readable storage medium is provided, wherein program code is stored in a computer readable storage medium, and when the program code is executed by a processor, the first aspect, the fifteenth aspect, and the first A method of any of the sixteen aspects and its alternative technical solutions.

According to a tenth aspect, a computer program product is provided, wherein when the program code included in the computer program product is executed by a processor, the first aspect, the fifteenth aspect, and the sixteenth aspect and its optional technical solutions are implemented. Any of the methods.

In an eleventh aspect, a base station is provided, comprising:

a processor, and a memory coupled to the processor, the memory storing program code, wherein when the program code is executed by the processor, the base station performs the fourth aspect, the seventeenth aspect, and A method of any one of the eighteenth aspect and its alternative technical solutions.

In a twelfth aspect, a processor is provided, comprising:

An interface unit, a processing unit, and a storage unit, wherein the program code is stored in the storage unit, and when the program code is decoded and executed by the processing unit, the fourth aspect, the seventeenth aspect, and the tenth are implemented Any of the eight aspects and its alternative technical solutions.

In a thirteenth aspect, a computer readable storage medium is provided, wherein program code is stored in a computer readable storage medium, and when the program code is executed by a processor, the fourth aspect, the seventeenth aspect, and A method of any one of the eighteenth aspect and its alternative technical solutions.

In a fourteenth aspect, a computer program product is provided, wherein the program code included in the computer program product is executed by a processor, implementing the fourth aspect, the seventeenth aspect, and the eighteenth aspect, and an alternative technical solution thereof Any of the methods.

According to a fifteenth aspect, a wireless communication method is provided, including:

Receiving a system message from a base station, where the system message is used to indicate multiple uplink carriers;

Establishing a wireless connection with the base station based on one or more of the plurality of uplink carriers;

Receiving a wireless connection setup message from the base station, the wireless connection setup message including a first field and a second field, wherein the first field is used to indicate a dedicated radio access preamble, and the second field is used to An uplink carrier indicating the transmission of the dedicated radio access preamble is indicated.

In a sixteenth aspect, a wireless communication method is provided, including:

Receiving time unit configuration information from the base station, the time unit configuration information being used to indicate a time unit pattern of one or more uplink carriers;

The time unit pattern is used to determine an uplink carrier used for data transmission with the base station, and each time unit pattern represents some or all of the time units in one uplink carrier.

In a seventeenth aspect, a wireless communication method is provided, including:

Sending a system message to the terminal, where the system message is used to indicate multiple uplink carriers;

Establishing a wireless connection with the terminal based on one or more of the plurality of uplink carriers;

Sending a wireless connection setup message to the terminal, where the wireless connection setup message includes a first field and a second field, where the first field is used to indicate a dedicated radio access preamble, and the second field is used to indicate Sending an uplink carrier of the dedicated radio access preamble.

According to an eighteenth aspect, a wireless communication method is provided, including:

Transmitting, to the terminal, time unit configuration information, where the time unit configuration information is used to indicate a time unit pattern of one or more uplink carriers;

The time unit pattern is used to determine an uplink carrier used for data transmission between the terminal and the base station, and each time unit pattern represents part or all of a time unit in an uplink carrier.

In an optional technical solution, the system message includes a third field, where the third field is used to indicate a format of an uplink carrier included in the system message.

In an optional technical solution, the system message includes a first system message and a second system message, where the first system message includes a fourth field, where the fourth field is used to indicate the Two system messages.

In an optional technical solution, the wireless connection between the terminal and the base station is a radio resource control RRC connection, and the wireless connection setup message is an RRC connection setup message or an RRC connection re-establishment message.

In an optional technical solution, the dedicated radio access preamble is a dedicated random access preamble.

In an optional technical solution, in a time unit pattern of the multiple uplink carriers, time units in a time unit pattern of at least two different uplink carriers are different from each other.

DRAWINGS

1 is a schematic diagram of a link in a wireless communication system;

2 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention;

3 is a schematic flowchart of a wireless communication method according to an embodiment of the present invention;

4 is a schematic structural diagram of a wireless communication apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another wireless communication apparatus according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a time unit pattern of an uplink carrier according to an embodiment of the present invention.

It should be understood that the size and shape of each module in the above structural diagram are for reference only, and should not constitute the only interpretation of the embodiment of the present invention. The relative positions of the modules presented in the schematic diagrams are only schematic representations of structural relationships between the modules, and are not intended to limit the physical connections of the embodiments of the invention. Furthermore, the structural diagram is neither possible nor necessary to present all possible modules. Therefore, if a certain module is not shown in the figure, it should not be interpreted that the module cannot be included in the embodiment of the present invention.

detailed description

In order to make the objects, technical solutions, and advantages of the present invention more comprehensible, the technical solutions provided by the present invention are further described in detail below with reference to the accompanying drawings.

In a wireless communication system, a communication device can be classified into a device that provides a network service and a device that enjoys a network service. A device that provides network services refers to those devices that form a network, which may be simply referred to as network equipment, or a network element. Network equipment is usually attributed to the owners of the network, including telecommunications carriers (such as China Mobile, Vodafone) and telecommunications infrastructure leasing companies (such as the tower company). Devices that enjoy network services are those that can access the network but are not part of the network. These devices are usually attributed to users and provide network services for users, which can be referred to as user equipment (UE) or subscriber unit (SU). For the user, the user equipment is a device that directly provides network services, and the network device is a device that provides network services indirectly.

Taking a mobile communication system as an example, a typical example of a user equipment is a mobile phone. After the mobile phone accesses the mobile communication network, the mobile communication service provided by the network can be enjoyed. The mobile communication network can be divided into a radio access network (RAN) and a core network (CN). Accordingly, network devices are also classified into RAN devices and CN devices. The RAN device is responsible for wireless related functions, such as an evolved Node B (eNB or eNodeB) of the LTE system. The CN device is responsible for the overall function of the network, and can be divided into a user plane (UP) device and a control plane device, such as a serving gateway (SGW) of the LTE system and a mobility management entity (mobility management entity). , MME).

For convenience of description, the wireless communication method, device and system provided by the present application will be described in detail below by taking a base station and a terminal as an example. The base station refers to a network device in a wireless communication system, especially a RAN device, including other RAN devices introduced in future RAN evolution. In a specific form, the base station may be a macro base station or a micro base station. Sometimes, a micro base station is also called a small cell.

A terminal refers to a user equipment in a wireless communication system. For example, the terminal can be a mobile phone or a cellular phone, a tablet computer, a laptop computer, or other device that supports wireless communication functions, such as an Internet of Things device, including a wearable device. , smart home equipment (smart meters, smart home appliances, etc.), smart vehicles, etc.

It should be understood that the technical solutions provided by the present application do not limit the types of wireless communication systems. Taking the mobile communication system as an example, the technical solution provided by the present application can be applied to various evolved systems of the LTE system, for example, the industry-called 4.5G mobile communication system, or the 5G mobile communication system introduced in the background art.

FIG. 2 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention. The wireless communication system includes at least one base station, and one base station is shown in FIG. 2, denoted as a BS. The wireless communication system also includes at least one terminal, and two terminals are shown in Fig. 2, denoted as T1 and T2, respectively. The uplink and downlink between T1 and BS are denoted as UL 1 and DL 1, respectively. The uplink and downlink between T2 and BS are denoted as UL 2 and DL 2, respectively. For the sake of brevity, only one base station and two terminals are shown in FIG. The wireless communication system can also include other numbers of base stations and terminals, as well as network devices other than the base stations.

In the wireless communication system, both the terminal and the base station support the radio access technology (RAT) of the system, and are aware of various configurations predefined by the system. The predefined configurations of these systems are pre-stored in the memory of the terminal and the base station, or in the structure of the hardware or software of the terminal and the base station.

The base station provides communication coverage for a specific geographical area through an integrated or external antenna device, and the terminal located within the coverage of the base station can communicate with the base station. Taking the LTE system as an example, one base station can manage one or more cells. Each cell has an identity, which is also known as a cell identity (cell ID). Unless otherwise stated, a plurality of cells refers to a plurality of different cells. From the perspective of radio resources, a cell is a combination of downlink radio resources and uplink radio resources (not necessary) paired with them.

In the present application, the radio resources managed by the base station will be introduced based on a carrier instead of a cell. Wherein, the carrier is used to indicate a range of frequencies that meet the system specifications. This frequency range can be determined by the center frequency of the carrier (referred to as the carrier frequency) and the bandwidth of the carrier. The meaning of the carrier can refer to the concept of component carrier (CC) in LTE. The set of values of the center frequency and the bandwidth of the carrier are predefined by the system. Unless otherwise stated, multiple carriers refer to multiple different carriers, ie, different frequency ranges. Therefore, the radio resources managed by the base station can be recorded as one or more downlink carriers, and one or more uplink carriers.

After the terminal is powered on, it can reside in a cell through the downlink synchronization process and receive system messages. The “resident” refers to a state in which the terminal and the base station can receive the system message after obtaining the downlink synchronization. In the present application, when there is a scenario in which the base station manages multiple downlink carriers, it can also be understood that the terminal can receive a state of the system message on the downlink carrier after obtaining downlink synchronization with one downlink carrier of the base station. After the terminal resides in the cell or resides on a downlink carrier, if there is a service requirement, a wireless access procedure may be initiated to establish a connection with the mobile communication system.

In the LTE system, the pairing relationship between the downlink resources and the uplink carriers constituting one cell is specified by the system. Moreover, if the uplink carrier and the downlink carrier are paired, only one pair can be paired. Different from the prior art, in the wireless communication system of the embodiment of the present invention, one uplink carrier managed by the base station can be paired with multiple downlink carriers, which is recorded as a first type scenario; in addition, one downlink carrier managed by the base station is also Can be paired with multiple uplink carriers, recorded as a second type of scenario. Therefore, in the wireless communication system of the embodiment of the present invention, the uplink carrier and the downlink carrier can be considered to be decoupled.

Based on the wireless communication system shown in FIG. 2, a wireless communication method according to an embodiment of the present invention will be described below with reference to FIG.

The wireless communication method is still taken as an example of the interaction between the terminal and the base station, and the technical solution of the embodiment of the present invention is introduced. In particular, the terminal-initiated wireless access procedure is introduced on the premise that the uplink carrier and the downlink carrier can be decoupled. FIG. 3 is a schematic flowchart diagram of a method for wireless communication according to an embodiment of the present invention. In Fig. 3, the direction of the horizontal connection between the base station and the terminal indicates the transmission direction, and the text on the horizontal connection indicates the name of the information or message transmitted in this step. It should be understood that the names of such information or messages are for illustrative purposes only and are not intended to limit the scope of the embodiments of the invention.

As shown in FIG. 3, the wireless communication method includes the following five steps:

Step S1: The base station sends a system message; the terminal detects and receives the system message.

The system message includes system configuration information required by the terminal to initiate a wireless access procedure. The system configuration information includes: uplink carrier configuration information and preamble transmission configuration information. The uplink carrier configuration information is used to indicate one or more uplink carriers, and the preamble transmission configuration information is used to indicate a transmission configuration of the radio access preamble.

The set of all possible radio access preambles, that is, the complete set of radio access preambles, belongs to a system pre-defined configuration. In order to avoid mutual interference between the radio access preambles, the pre-defined radio access preambles of the system are usually code-divided, that is, two different radio access preambles are orthogonal to each other. Thus, even if two different radio access preambles are transmitted on the same time-frequency resource, the base station can detect the two different radio access preambles, respectively.

After receiving the system message, the terminal knows the system configuration information required to initiate the wireless access. For example, after the uplink carrier configuration information is parsed in the system message, the terminal knows which uplink carriers can initiate wireless access. After parsing the transmission configuration information of the radio access preamble in the system message, the terminal knows how to send the radio access preamble on the uplink carrier. Thereafter, when the terminal wants to establish a connection with the network, the terminal may initiate a wireless access procedure, as described in step S2 below.

Step S2: The terminal sends a radio access preamble; the base station detects and receives the radio access preamble.

When the terminal initiates a radio access procedure, the terminal needs to send a radio access preamble on the uplink carrier. The terminal sends the wireless access preamble, which can be regarded as a wireless access attempt. Correspondingly, the base station detects whether there is a radio access preamble on the uplink carrier. Similar to the LTE system, the detection method can be related detection. If the radio access preamble is not detected, the terminal may not send the radio access preamble, or the radio access preamble transmission fails. If the wireless access preamble is detected, it can be determined that a terminal initiates a wireless access procedure. Thereafter, the base station will respond to the detected radio access preamble, as described in step S3 below.

Step S3: The base station sends a radio access response message; the terminal detects and receives the radio reception response message.

After detecting the radio access preamble on an uplink carrier, the base station sends a radio access response message. The radio access response message includes configuration information that the terminal continues the subsequent radio access procedure. For example, the resource that transmits the wireless connection setup request message in step S4 is included. Different from the prior art, in the embodiment of the present invention, since the terminal may initiate a radio access procedure on multiple uplink carriers, the base station needs to indicate the uplink carrier in the subsequent radio access procedure to the terminal. Specifically, the base station sets a radio access response message according to the identifier information of the uplink carrier to be indicated, and sends the radio access response message on the downlink carrier.

Correspondingly, after transmitting the radio access preamble, the terminal also detects the radio access response message on the downlink carrier. For the terminal, by detecting the wireless access response message, the terminal can thereby determine the result of the current wireless access attempt. In addition, since the terminal can transmit the radio access preamble on multiple uplink carriers, the terminal can also determine the uplink carrier indicated by the network by detecting the radio access response message.

For example, if the terminal does not detect the wireless access response message for a period of time, it is determined that the current wireless access attempt has failed. Subsequently, the terminal can stop the subsequent wireless access procedure. Wait for a while before sending the wireless access preamble. The terminal transmits the radio access preamble again, which can be regarded as another attempt of wireless access.

If the terminal detects and receives the radio access response message on the downlink carrier, and determines that the current radio access attempt has not failed, the subsequent radio access procedure may continue, as described in step S4. Conversely, if the terminal determines that the current radio access attempt has failed, step S4 need not be performed. In other words, step S4 and subsequent steps are not necessarily performed, and are therefore optional steps.

S4. The terminal sends a wireless connection establishment request message; the base station detects and receives the wireless connection establishment request message.

The wireless connection setup request message is used to request to establish a wireless connection with the network. The wireless connection establishment request message may also be used to indicate a downlink carrier where the terminal camps. For example, the terminal may scramble the content in the wireless connection setup request message using the identity information of the resident downlink carrier. Alternatively, the terminal directly carries the identifier information of the downlink carrier that resides in the wireless connection establishment request message.

If the base station detects and receives the wireless connection establishment request of the terminal, and agrees that the terminal establishes a wireless connection with the network, the base station sends a wireless connection establishment complete message to the terminal, that is, step S5 is performed. The wireless connection setup complete message is used to indicate configuration information of the wireless connection between the terminal and the network. If the terminal does not agree, the terminal establishes a wireless connection with the network, and the wireless connection establishment completion message may not be sent. Alternatively, the base station may also send other messages, which are used to indicate that the wireless connection establishment between the terminal and the network fails. Therefore, step S5 is also an optional step.

S5. The base station sends a wireless connection setup complete message; the terminal detects and receives the wireless connection setup complete message.

If the terminal detects and receives the wireless connection establishment complete message, it can be determined that the wireless connection with the network is successfully established. After the wireless connection is successfully established, the terminal can determine which downlink carrier (which is also the downlink carrier that detects and receives the wireless access response message) that receives the system message and the uplink carrier indicated by the network (also the one that sends the wireless connection establishment request) The uplink carrier is paired, which is a downlink primary carrier or an uplink primary carrier, respectively. Thereafter, the terminal and the base station can transmit service data to each other based on the two carriers.

With the wireless communication method shown in FIG. 3, at least these technical effects can be obtained: the base station sets a radio access response message according to the identification information of the uplink carrier, and the terminal detects the radio access response message. From a system perspective, the terminal thus determines the result of the current radio access attempt, so that the terminal can suspend the subsequent process in time when determining that the radio access attempt fails. In addition, when the terminal determines the uplink carrier indicated by the network, the terminal can obtain the uplink carrier confirmed by the network, which is beneficial to improving the reliability of the subsequent wireless access procedure. Therefore, the wireless communication method shown in FIG. 3 is employed to facilitate establishing a connection between the terminal and the base station.

It should be noted that, in step S1, the base station sends the system message, and is not limited to transmitting the system message only on one downlink carrier, and also includes the base station transmitting multiple system messages on multiple downlink carriers.

In a wireless network, a downlink resource of a cell usually includes only one downlink carrier. If the system message is in units of cells, the system messages in different cells are often different. If a downlink carrier represents a cell, the system messages on the multiple downlink carriers also represent system messages of multiple cells. For the carrier aggregation scenario, the plurality of downlink carriers may be further divided into a downlink primary carrier (representing a primary cell) and a downlink secondary carrier (representing a secondary cell). Certainly, the embodiment of the present invention does not exclude the case where the downlink resource of one cell includes multiple downlink carriers.

In the embodiment of the present invention, if the content of the system messages sent on different downlink carriers is not completely the same, it is considered to be a different system message. If the two system messages contain exactly the same content, even if they are sent on different downlink carriers, they can be considered as the same system message. For example, the case where the downlink carrier of one cell includes multiple downlink carriers.

From the perspective of the terminal, the terminal usually resides in a cell, and receives the synchronization signal broadcasted in the cell to obtain frequency and time synchronization with the downlink carrier of the cell. Then, the terminal detects whether there is a system message on the downlink carrier of the cell; if so, it receives the system message. Thus, even if the base station transmits multiple system messages on multiple downlink carriers, the terminal may only receive system messages on the downlink carrier on which it resides. However, different terminals may receive different system messages on different downlink carriers.

Next, the present application will describe some optional implementation manners of the embodiments of the present invention in detail for the two types of scenarios in which the uplink carrier and the downlink carrier are decoupled.

The first type of scenario, one uplink carrier and multiple downlink carriers are paired

The base station transmits a plurality of system messages on a plurality of downlink carriers, wherein the plurality of system messages indicate at least one identical uplink carrier.

At this time, because the terminals residing on different downlink carriers may initiate a radio access procedure on the same uplink carrier, and pair with the multiple downlink carriers respectively. Thus, for the system, one uplink carrier can be paired with multiple upstream carriers. Before transmitting the system messages, the base station knows the possible combination of determining the uplink carrier to pair with the plurality of downlink carriers. However, the base station may only be able to distinguish which downlink carrier the radio access preamble is transmitted by using the detected radio access preamble. Therefore, in order to be able to respond to the terminal, the base station may have to transmit a radio access response message in all downlink carriers that may be paired with the uplink carrier that detected the radio access preamble. Obviously, this requires a lot of system overhead.

For a first type of scenario, in an optional implementation manner of the present invention, the transmission configuration of the radio access preamble indicated by the plurality of different system messages sent by the base station is different. On the basis of this, the base station can determine the system message indicating the transmission configuration according to the detected transmission configuration of the radio access preamble, and then send the radio access response message only on the downlink carrier that has sent the system message. , thereby reducing system overhead.

The transmission configuration of the radio access preamble indicated by the plurality of different system messages sent by the base station is different, including one or more of the following situations:

The time domain resources occupied by the radio access preambles indicated by the multiple system messages are different;

The radio access preambles indicated by the plurality of system messages occupy different frequency domain resources;

Hereinafter, various optional technical solutions of the embodiments of the present invention will be described in detail in conjunction with FIG. 2 and the embodiments.

Referring to FIG. 2, it is assumed that the base station BS transmits two different system messages in DL 1 and DL 2. The system message on DL 1 indicates an uplink carrier, such as UL 1. The system message on DL 2 indicates two uplink carriers, such as UL 1 and UL 2. Terminal T1 resides on DL 1, and terminal T2 resides on DL 2, receiving system messages on DL 1 and DL 2, respectively.

If the above optional implementation is not adopted, the base station detects the radio access preamble at UL 1, and may not be able to distinguish whether the radio access preamble is transmitted by T1 or T2. If the above optional implementation is adopted, the transmission configurations of the radio access preambles of T1 and T2 are different. Therefore, after detecting the radio access preamble, the base station can identify the downlink carrier where the terminal transmitting the radio access preamble resides according to the transmission configuration of the radio access preamble, and then only on the identified downlink carrier. Send a wireless access response message.

Example 1

The time domain resources occupied by the radio access preambles indicated by the multiple system messages are different.

For example, the occupied time domain resource of the radio access preamble indicated by the system message on the DL 1 is a subframe 1 or a subframe 3, and the radio access preamble indicated by the system message on the DL 2 is occupied. The time domain resources are subframe 2 and subframe 4. If the base station detects a radio access preamble on subframe 1 or subframe 3 of UL 1, it only needs to transmit a radio access response message on DL 1. If the base station detects a radio access preamble on subframe 2 or subframe 4 of UL 1, it is only necessary to transmit a radio access response message on DL 2.

Example 2

The radio access preambles indicated by the multiple system messages occupy different frequency domain resources.

For example, the frequency domain resource occupied by the radio access preamble indicated by the system message on the DL 1 is a resource block (RB) of 1-6, and the radio access preamble indicated by the system message on the DL 2 is occupied. The frequency domain resources are RBs 11-16. If the base station detects a radio access preamble on the 1-6 RB of UL 1, it only needs to transmit a radio access response message on DL 1. If the base station detects a radio access preamble on the RBs 11-16 of UL 1, it is only necessary to transmit a radio access response message on DL 2.

Example 3

For example, the radio access preamble set of the radio access preamble indicated by the system message on the DL 1 is set 1. The radio access preamble set of the radio access preamble indicated by the system message on the DL 2 is a set. 2. If the base station detects the radio access preamble home set 1 at UL 1, then only the radio access response message needs to be sent on DL 1. If the base station detects the radio access preamble home set 2 at UL 1, it is only necessary to transmit a radio access response message on DL 2.

Example 4

In the case of the foregoing embodiments, the downlink carrier that the terminal that sends the wireless access preamble is located can be identified, and then the wireless connection is sent only on the identified downlink carrier. In response message.

For example, the time domain resource occupied by the radio access preamble indicated by the system message on the DL 1 is a subframe 1 or a subframe 3, and the occupied frequency domain resource is a resource block 1-6 (resource) Block, RB). The time domain resources occupied by the radio access preamble indicated by the system message on the DL 2 are

subframes

2 and 4, and the occupied frequency domain resources are 11-16 RBs. If the base station detects a radio access preamble on subframe 1 or subframe 3 of UL 1, or detects a radio access preamble on 1-6 RB of UL 1, it only needs to transmit radio on DL 1 Access response message. If the base station detects the radio access preamble on the subframe 2 or the subframe 4 of the UL 1, or the radio access preamble is detected on the RBs 11-16 of the UL 1, the radio connection only needs to be sent on the DL 2 In response message.

The second type of scenario, one downlink carrier is paired with multiple uplink carriers

A system message transmitted on one downlink carrier indicates a plurality of uplink carriers. After receiving the system message, the terminal knows that the terminal can send the radio access preamble on these uplink carriers. Therefore, for the system, the multiple uplink carriers are all candidate uplink carriers, and the downlink carrier is capable of being paired with multiple uplink carriers. Moreover, before the base station sends the system message, the terminal can determine this after receiving the system message.

For the system, although the downlink carrier can be paired with multiple uplink carriers, it is still meaningful to find one of the most suitable uplink carriers among the uplink carriers and then pair with the downlink carrier. For example, the most suitable uplink carrier is configured as an uplink primary carrier, and more important information can be transmitted on the uplink primary carrier. Optionally, one or more of the other carriers in the uplink carriers may also be configured as uplink secondary carriers. The criteria for the suitability of the uplink carrier are not limited, and may have various possibilities, such as high uplink transmission reliability, strong uplink coverage capability, or low uplink load.

The wireless communication method of the embodiment of the present invention further includes the following two optional implementation manners based on the objective of finding the most suitable uplink carrier:

The first type, the base station selects the most suitable uplink carrier

The terminal transmits the same radio access preamble on the plurality of candidate uplink carriers indicated by the system message. The base station detects a radio access preamble on the plurality of candidate uplink carriers indicated by the system message, and determines one uplink carrier among the plurality of uplink carriers that detect the same radio access preamble. The uplink carrier selected by the base station is the most suitable uplink carrier found by the base station. Other carriers transmitting the same radio access preamble may be blindly configured by the base station as the uplink secondary carrier of the terminal. Since the base station has more information, the uplink carrier determined by this alternative method may be closer to the real situation. At this time, the base station should indicate the determined uplink carrier to the terminal, so that the terminal can determine the uplink carrier indicated by the network.

Second, the most suitable uplink carrier is selected by the terminal.

The terminal selects one uplink carrier among the multiple candidate uplink carriers indicated by the system message, and sends a radio access preamble on the uplink carrier. The uplink carrier selected by the terminal is the most suitable uplink carrier found by the terminal. Since only the radio access preamble needs to be transmitted on one uplink carrier, this optional method can save system overhead.

In this way, the base station sends in the system message of the downlink carrier.

There may be multiple selection criteria for the terminal among the plurality of candidate uplink carriers, and the selection criteria may be indicated by the base station in the system message. For example, when the measured value of the downlink carrier in the terminal is greater than a threshold, the measured value may be based on the downlink carrier cell reference signal, may be a synchronization signal according to the downlink carrier, may be a measurement of the link state reference signal according to the downlink carrier. The value, the terminal chooses to transmit the wireless preamble on a high frequency carrier; if the measured value is less than the threshold, the terminal transmits the wireless preamble on a low frequency carrier. The threshold of the measured value can be carried in the system message.

For a base station, since there may be two terminals transmitting the same radio access preamble in two candidate uplink carriers, the base station may still need to determine among the two candidate uplink carriers that detect the same radio access preamble. An uplink carrier, so it is necessary to indicate the uplink carrier to the terminal. In addition, even if the radio access preamble detected by the base station involves only one candidate uplink carrier. Since there is a case of detecting an error, it is also advantageous for the base station to indicate the uplink carrier to the terminal, which still helps the terminal identify the uplink carrier indicated by the network.

Analysis of the two alternative embodiments shows that it is meaningful for the base station to indicate the uplink carrier to the terminal. Therefore, in the embodiment of the present invention, the base station may further set a radio access response message according to the identifier information of the uplink carrier, and send the radio access response message on the downlink carrier, so as to indicate the uplink carrier to the terminal. The base station sets the radio access response message according to the identifier information of the uplink carrier to be indicated, and includes various possible technical solutions as follows.

Example 5

The base station carries the identifier information of the uplink carrier to be indicated in the radio access response message. If the radio access response message is detected by the terminal, the uplink carrier identified by the identifier information is determined as the uplink carrier indicated by the network.

For the first embodiment described above, the most suitable uplink carrier is determined by the base station.

If the uplink carrier identified by the identifier information belongs to the candidate uplink carrier indicated by the system message. Thus, the terminal can determine that the wireless access response message is valid. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. If the uplink carrier identified by the identification information does not belong to the candidate uplink carrier indicated by the system message. Thus, the terminal can determine that the wireless access response message is invalid. Thereafter, the terminal can abort the subsequent access process.

For the second implementation manner described above, the terminal determines the most suitable uplink carrier, and the terminal may have two schemes.

In the first solution, if the uplink carrier identified by the identifier information is an uplink carrier selected by the terminal, the terminal may determine that the radio access response message is valid. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. If the uplink carrier identified by the identifier information is not the uplink carrier selected by the terminal, the terminal may determine that the radio access response message is invalid. Thereafter, the terminal can abort the subsequent access process.

In the second scheme, if the uplink carrier identified by the identifier information is an uplink carrier selected by the terminal, the terminal may determine that the radio access response message is valid. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. If the uplink carrier identified by the identifier information is not the uplink carrier selected by the terminal, nor the candidate uplink carrier indicated by the system message, the terminal may determine that the radio access response message is invalid. Thereafter, the terminal can abort the subsequent access process. If the uplink carrier identified by the identifier information is not the uplink carrier selected by the terminal, but belongs to the candidate uplink carrier indicated by the system message, the terminal may determine that the radio access response message is valid. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. At this time, it is regarded as the network changing the uplink carrier selected by the terminal.

Example 6

The base station carries the identifier information of the uplink carrier to be instructed in the control information of the radio access response message, where the control information is used to indicate the transmission configuration of the radio access response message. If the control information of the radio access response message is detected, the uplink carrier identified by the identifier information is determined as the uplink carrier indicated by the network.

If the uplink carrier identified by the identifier information belongs to the candidate uplink carrier indicated by the system message. Thereby, the terminal can determine that the radio access response message indicated by the control information is valid. The terminal can continue to receive the wireless access response message. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. If the uplink carrier identified by the identifier information does not belong to the candidate uplink carrier indicated by the system message. Thereby, the terminal can determine that the radio access response message indicated by the control information is invalid. Thereafter, the terminal can abort the subsequent access process. It is not necessary for the terminal to receive the radio access response message indicated by the control information.

In the first scheme, if the uplink carrier identified by the identifier information is an uplink carrier selected by the terminal, the terminal may determine that the radio access response message indicated by the control information is valid. The terminal can continue to receive the wireless access response message. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. If the uplink carrier identified by the identifier information is not the uplink carrier selected by the terminal, the terminal may determine that the radio access response message indicated by the control information is invalid. Thereafter, the terminal can abort the subsequent access process.

In the second scheme, if the uplink carrier identified by the identifier information is an uplink carrier selected by the terminal, the terminal may determine that the radio access response message indicated by the control information is valid. The terminal can continue to receive the wireless access response message. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. If the uplink carrier identified by the identifier information is not the uplink carrier selected by the terminal, nor the candidate uplink carrier indicated by the system message, the terminal may determine that the radio access response message indicated by the control information is invalid. Thereafter, the terminal can abort the subsequent access process. If the uplink carrier identified by the identifier information is not the uplink carrier selected by the terminal, but belongs to the candidate uplink carrier indicated by the system message, the terminal may determine that the radio access response message indicated by the control information is valid. The terminal can continue to receive the wireless access response message. Thereafter, the terminal may send a wireless connection setup request message on the uplink carrier indicated by the network. At this time, it is regarded as the network changing the uplink carrier selected by the terminal.

Example 7

And the base station pre-processes control information of the radio access response message by using the determined identifier information of the uplink carrier, where the control information is used to indicate a transmission configuration of the radio access response message. The pre-processing is also a pre-defined configuration of the system. Both the terminal and the base station are aware of the pre-processing operation, for example, scrambling, and the terminal corresponding operation is descrambling.

If the control information is detected by the terminal based on the identifier information of an uplink carrier, the uplink carrier is determined as the uplink carrier indicated by the network. Thereby, the terminal can determine that the radio access response message indicated by the control information is valid. The terminal can continue to receive the wireless access response message. Thereafter, the terminal may send a wireless connection establishment request message on the uplink carrier indicated by the network, and the wireless connection establishment request message is used to request to establish a wireless connection with the network.

If the terminal tries the identification information of all the uplink carriers, the control information of the radio access response message cannot be detected, and thus the current radio access attempt fails.

Taking scrambling as an example, in LTE, the calculation formula of the scrambling sequence RA-RNTI for scrambling the random access response is RA-RNTI=1+t _id +10*f _id , where t _id is the transmission The first subframe number where the preamble is located, the f _id subframe is the index of the transmitting preamble in the frequency domain, f _id =0 for the FDD carrier, and f _id less than 6 for the TDD carrier.

In the embodiment of the present invention, a plurality of terminals residing on the same downlink carrier can send the same preamble sequence on two different uplink carrier subsets, so that the terminal can distinguish that the radio access response is sent to The calculation of the scrambling sequence RCS of which terminal, the control information for scrambling the radio access response message may be related to the identifier of the uplink carrier to be indicated, for example, RCS=1+t _id +10*f _id +UL ID, The UL ID indicates the identifier of the uplink carrier to be indicated.

When the above two types of scenarios are supported in the wireless communication system, the combination of any one of the embodiments 1 to 4 and the embodiments 5 to 7 is a new embodiment, and includes at least 12 possibilities. The combination. For example, Embodiment 1 and Embodiment 5 can be combined into a new embodiment, and Embodiments 1 and 7 can also be combined into a new embodiment. Embodiment 4 and Embodiment 5 can also be combined into a new embodiment.

Example 8

A second type of scenario in which the uplink carrier and the downlink carrier are decoupled, that is, when one downlink carrier is paired with multiple uplink carriers, the system message sent by the base station on one downlink carrier may be used to indicate multiple uplink carriers.

It should be understood that the system message herein may be an improvement of LTE based system messages or a system message defined in the NR system. For example, the name of the system message may be a system information block (SIB), such as SIB2; or may be a remaining minimum system information (RMSI) or the like.

In an optional implementation manner, a system message is used to carry multiple configuration cells about the uplink carrier, and the number of configuration cells about the uplink carrier carried in the system message is indicated by other cells. Each configuration element about the uplink carrier is used to indicate configuration information of an uplink carrier.

The following is a schematic cell structure of system information:

In this schematic cell structure, SystemInformationBlockType2 (abbreviated as SIB2) or RMSI is the name of the system message. The SIB2/RMSI includes a radioResourceConfigNum cell for indicating the number of radio resource configurations, a radioResourceConfigCommon cell for indicating radio resource configuration, a freqInfo cell for indicating frequency information, and other cells not shown (with a three-point ellipsis) ... indicates).

The value of the radioResourceConfigNum cell is used to indicate the number of radio resource configurations included in the system message. The value of the radioResourceConfigNum cell may be an enumerated type, and different values correspond to different numbers. The actual values of n1 and n2 can be pre-agreed, for example, the value of n1 is 1, and the value of n2 is 2. When the value of the radioResourceConfigNum cell is 1, it indicates that the system message contains a radio resource configuration. When the value of the radioResourceConfigNum cell is 2, it indicates that the system message contains two radio resource configurations. The number of radioResourceConfigCommon cells in the cell structure of the above-mentioned schematic system information is the number of radio resource configurations included in the system message.

In another optional implementation manner, a system message is used to carry a configuration cell of an uplink carrier, and indicates, by other cells, whether other system messages on the downlink carrier are also used to indicate configuration information of other uplink carriers.

The cell structure of another schematic system information is as follows:

In the schematic cell structure, the SIB2/RMSI includes a radioResourceConfigOther SIB cell for indicating other SIB radio resource configurations, a radioResourceConfigCommon cell for indicating radio resource configuration, a freqInfo cell for indicating frequency information, and others. A cell not shown (represented by a three-point ellipsis...).

The radioResourceConfigOtherSIB cell is used to indicate whether other system messages also carry the information of the radio resource configuration. The value of the cell may be an enumerated type, and different enumerated types may represent different meanings. For example, the schematic enumeration type FALSE indicates that there is no other SIB radio resource configuration information, and the enumeration type SIB3 indicates that other radio resource configuration information is indicated in SIB3. It should be understood that SIB3 is only an example, and other radio resource configuration information may also be carried in other system messages. Different system messages may correspond to different enumerated types, and may also include an enumerated type corresponding to SIB4, SIB5 or other system messages.

As an optional implementation manner, the radioResourceConfigCommon cell used to indicate the radio resource configuration in the cell structure of the two schematic system messages may have the following schematic cell structure:

The radioResourceConfigCommon cell includes: a random access channel rach common configuration rach-ConfigCommon cell, a physical downlink shared channel pdsch common configuration pdsch-configCommon cell, a physical random access channel prach configuration prach-Config cell. The rach-ConfigCommon cell may include at least: time domain resource information (what time slot of the system frame can transmit the preamble), frequency domain resource information (what frequency domain resource of the uplink resource can transmit the preamble), and the preamble Format information (including at least the sequence length of the preamble, the subcarrier spacing size, the time domain length) and the like. At least the rach root sequence information may be included in the prach-Config cell.

The pdsch-configCommon cell indicates configuration information about the downlink carrier. When the system message includes multiple radioResourceConfigCommon cells, only one of the radioResourceConfigCommon cells needs to include the pdsch-configCommon cell. For example, as shown in the schematic cell structure below, the pdsch-configCommon cell is optional for other radioResourceConfigCommon cells.

In an alternative embodiment, in the cell structure of the two schematic system messages, the freqInfo cell may include an uplink carrier frequency field ul-CarrierFreq and an uplink carrier bandwidth field ul-Bandwidth. The uplink carrier frequency point field indicates the frequency point information of the uplink carrier, the uplink carrier bandwidth field is an indication of an enumerated type, and one enumerated type value corresponds to one bandwidth value, for example, n6 represents a bandwidth of 6 PRBs, ..., n400 represents The bandwidth of 400 PRBs.

As an optional implementation manner, in the cell structure of the two schematic system messages, the uplink carrier selection threshold ULCCselectionThreshold cell is optional.

It should be understood that when the system message does not include the ULCCselectionThreshold cell, the terminal may send the preamble on multiple sets of uplink carriers broadcasted in the system message, which may correspond to the first case of the second type scenario, that is, the base station selects the most A suitable upstream carrier.

When the configuration message of the uplink carrier selection threshold is included in the system message, the second scenario of the second type scenario may be corresponding, that is, the terminal selects the most suitable uplink carrier. For example, the measured value of the following line carrier is RSRP. The terminal determines the uplink carrier that initiates random access according to the RSRP measurement result of the downlink carrier that receives the system message.

If the RSRP measurement result is greater than or equal to the threshold, the preamble is transmitted on the uplink resource indicated in the first radio resource configuration information broadcasted in the SIB2/RMSI. If the RSRP measurement result is less than the threshold, send on the uplink resource indicated in the non-first radio resource configuration information broadcasted in the SIB2/RMSI or the uplink resource in the radio resource configuration information indicated in the other SIB message block. Preamble.

Example 9

With respect to the wireless communication method shown in FIG. 3, in step S5, the base station transmits a wireless connection establishment completion message; the terminal detects and receives the wireless connection establishment completion message.

As an optional implementation manner, the radio connection setup complete message may include a dedicated preamble and uplink carrier resource information, that is, the base station triggers the terminal to initiate non-competition on the designated uplink carrier by using the radio connection setup complete message. Random access, the process of reconfiguring the uplink carrier. It should be understood that the wireless connection setup complete message may correspond to the message 4 (referred to as Msg4) in the random access procedure, such as a radio resource control (RRC) connection setup message or an RRC connection re-establishment message.

The cell structure of another exemplary RRC connection setup message is as follows:

The RRCConnectionSetup is the name of the RRC connection setup message, where the dedicated preamble and the uplink carrier resource information may be carried in the RRCConnectionSetup-r8-IEs cell. Specifically, the following is a cell structure of an exemplary RRCConnectionSetup-r8-IEs cell:

The dedicated preamble and the uplink carrier resource information may be carried in a radioResourceConfigDedicated cell in a schematic structure of an RRCConnectionSetup-r8-IEs cell.

Specifically, the following is a cell structure of an exemplary radioResourceConfigDedicated cell:

The RACH-specific configuration RACH-ConfigDedicate cell includes information required by the UE to initiate non-contention random access using the specified preamble format on the specified uplink resource.

For example, the ra-PreambleIndex field in the RACH-ConfigDedicate cell is used to indicate the specified dedicated preamble information, and the ra-PRACH-MaskIndex field in the RACH-ConfigDedicate cell is used to indicate the number of the specified preamble in the radio frame. The RACH-ConfigDedicate message is used to indicate that the terminal initiates random access by using the specified dedicated preamble on the specified RACH resource of the specified uplink resource.

Wherein, for the ULCCIndex field, if the value indicated by the value is equal to 0, it indicates that the uplink resource 0, the uplink resource in the first radio resource broadcasted in the SIB2/RMSI in Embodiment 8, initiates non-contention random access, The ULCCIndex is equal to 1 indicating that the UE initiates a non-contention random on the uplink resource 1, the uplink resource in the non-first (eg, second) radio resource broadcasted in the SIB indicated by the SIB2/RMSI or SIB/RMSI in Embodiment 8. Access. It should be understood that the number of bits of the ULCC index field is not specifically limited, for example, may be related to the maximum number N of SIB/RMSI broadcastable radio resources, for example, the number of bits of the field is rounded up by log ₂ N. It should be understood that the name of the ULCCIndex field is only a schematic, and the length may not be limited to 1 bit, but may be 2 bits, 3 bits or more.

Example 10

Based on the wireless communication method shown in FIG. 3, the terminal and the base station can establish a wireless connection. The wireless connection may correspond to an RRC connection of an LTE system or an NR system, or a wireless connection in an NR system. Thereafter, when the establishment of the wireless connection between the terminal and the base station is completed, the terminal and the base station can transmit data to each other. The transmission of the data includes the transmission of the traffic data channel and also the transmission of the control channel.

A second type of scenario in which the uplink carrier and the downlink carrier are decoupled, that is, when one downlink carrier is paired with multiple uplink carriers, the system message sent by the base station on one downlink carrier may be used to indicate multiple uplink carriers. For example, the system message may refer to the manner of the foregoing Embodiment 8, and details are not described in this embodiment.

Taking two uplink carriers as an example, a system message on one downlink carrier is assumed, indicating two uplink carriers. After the terminal establishes a wireless connection with the base station, the terminal and the base station can transmit data to each other based on one or two uplink carriers of the two uplink carriers.

When there are more than two uplink carriers, such as three or more uplink carriers, the case of two uplink carriers can be referred to. After the terminal establishes a wireless connection with the base station, one or a part or all of the uplink carriers of the terminal and the base station transmit data to each other.

In an optional implementation manner, the base station sends time unit configuration information to the terminal, and the terminal receives time unit configuration information from the base station. The time unit configuration information is used to indicate a time unit pattern of one or more uplink carriers. The time unit pattern is used to determine an uplink carrier used for data transmission with the base station. Each time unit pattern represents some or all of the time units in one uplink carrier. A collection of these time units can be understood as a time unit pattern. It should be understood that the time unit configuration information may be carried in an RRC message, downlink control information or media access control (MAC) control element (CE) or cell level broadcast signaling. The time unit can be a subframe, a slot or a symbol.

FIG. 8 is a schematic diagram showing a time unit pattern of an uplink carrier according to an embodiment of the present invention, and FIG. 8 illustrates ten time units, which are sequentially numbered from 0 to 9. Among them, the 3.5 GHz carrier (referred to as 3.5G carrier) is configured in TDD mode, the

time units

3 and 7 are used for uplink transmission, and the other time units are used for downlink transmission. Therefore, a 3.5 G carrier can be considered to include both a 3.5G uplink carrier (corresponding to time units 3 and 7) and a 3.5G downlink carrier (corresponding to other time units). The 1.8 GHz carrier (referred to as 1.8G carrier for short) is configured in FDD mode, and 10 time resources can be used for uplink transmission, and the 1.8G carrier can be considered as 1.8G uplink carrier.

In FIG. 8, the time unit pattern of the 3.5G uplink carrier includes time units No. 3 and No. 7. At this time, the time unit indicated by the time unit pattern of the 3.5G uplink carrier is all time units of the 3.5G uplink carrier. The time unit pattern of the 1.8G uplink carrier includes time units No. 1, No. 2, No. 5, No. 6, and No. 8. At this time, the time unit indicated by the time unit pattern of the 1.8G uplink carrier is a partial time unit of the 1.8G uplink carrier.

After the terminal knows the time unit pattern of at least one uplink carrier in the time unit pattern of the two uplink carriers shown in FIG. 8 through the uplink resource configuration information, it can be considered that both uplink carriers can be used for uplink transmission. At this time, the two uplink carriers can be understood as both uplink primary carriers of the terminal.

For example, if the terminal receives the scheduling information of the uplink data transmission (such as PUSCH), the time unit scheduled by the scheduling information is the time unit No. 1. Then, if the terminal is based on the time unit pattern of the 1.8G uplink carrier, it is known that the uplink data should be transmitted on the time unit No. 1 of the 1.8G uplink carrier. Alternatively, if the terminal is based on the time unit pattern of the 3.5G uplink carrier and knows that the uplink data should not be transmitted on the 3.5G uplink carrier, the uplink data should be transmitted on the time unit No. 1 of the 1.8G uplink carrier. Similarly, if the terminal is to perform uplink control channel (such as PUCCH) transmission in time unit No. 3, the terminal may also know that the uplink control channel should be transmitted in the time unit of the 3.5G uplink carrier.

Therefore, based on the alternative embodiment, the terminal and the base station can determine the uplink carrier used for data transmission based on the time unit pattern of the uplink carrier.

It should be understood that, based on the alternative embodiment, in a possible design, the time unit configuration information may explicitly indicate a time unit pattern of the uplink carrier. For example, the time unit configuration information is used to directly indicate a set of time units included in the time unit pattern of the uplink carrier. Certainly, the time unit pattern of the uplink carrier may also be predefined by a protocol, and different time unit patterns correspond to different indexes, and the time unit configuration information indicates an index of the time unit pattern, that is, a time unit pattern of the uplink carrier may be indicated.

In another possible design, the time unit configuration information may implicitly indicate a time unit pattern of the uplink carrier. For example, the time unit configuration information is used to indicate a set of time units in the uplink carrier that do not belong to the time unit pattern, thereby indirectly indicating a time unit pattern of the uplink carrier. Taking FIG. 8 as an example, the base station indicates, by semi-static (such as system message or RRC message) or dynamic signaling (such as DCI), that the time units of No. 0, No. 3, No. 4, No. 7, and No. 9 of the 1.8G uplink carrier do not belong. The time unit pattern of the 1.8G uplink carrier, for example, as a reserved resource or downlink transmission, etc., the terminal indirectly knows that the time unit pattern of the 1.8G uplink carrier is the remaining time unit (No. 1, No. 2, No. 5, No. 6 and Time unit 8). Specifically, the base station may indicate, through the 3.5G downlink carrier, those time units of the 1.8G uplink carrier that do not belong to the time unit pattern. Similarly, the base station can also indicate those time units of the 3.5G uplink carrier that do not belong to the time unit pattern through the 3.5G downlink carrier.

It should be understood that the base station may also indicate one or more time unit patterns of one or more uplink carriers by one or more time unit configuration information. For example, one uplink carrier has multiple time unit patterns, and the terminal selects one time unit pattern by default or selects a time unit pattern according to signaling of the base station.

In addition, if the terminal is configured as a dual connectivity (DC) mode of NR and LTE, assuming that 1.8G carrier is used for LTE connection, a combination of 3.5G carrier and 1.8G carrier is used for NR connection, 3.5G for NR And the time unit pattern of the 1.8G uplink carrier can be sent to the terminal through the NR base station, or can be sent to the terminal through the LTE base station. In the latter case, the NR base station may be required to first transmit the time unit configuration information of the time unit pattern of the 3.5G and 1.8G uplink carriers of the NR to the LTE base station, and then the LTE base station configures the time unit configuration information transmission terminal.

FIG. 4 is a schematic structural diagram of a wireless communication apparatus according to an embodiment of the present invention, and the wireless communication apparatus may be a processor. As shown, the wireless communication device 40 includes an interface unit 401, a control and operation unit 402, and a storage unit 403. The program code is stored in the storage unit, and the program code can be divided into two types, which are respectively used to implement the functions belonging to the terminal and the base station in the wireless communication method of the embodiment of the present invention. These two types of program codes are recorded as program code implemented by the terminal function and program code implemented by the base station function. When the terminal function implementation program code is decoded and executed by the control and operation unit, the function of the terminal in the wireless communication method of the embodiment of the present invention is implemented. The function of the base station in the wireless communication method of the embodiment of the present invention is implemented when the program code implemented by the base station function is decoded and executed by the control and operation unit. The terminal and the base station and the processor in the terminal can refer to the structure diagram, and store the terminal function implementation program code and the base station function implementation program code respectively. Thereafter, the terminal and the base station can cooperate with each other to implement the wireless communication method of the embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a wireless communication apparatus according to an embodiment of the present invention. As shown in FIG. 5, the wireless communication device 50 includes a processor 501 and a memory 502 coupled to the processor. The program code is stored in the memory 502. The program codes can be divided into two types, which are respectively used to implement the functions belonging to the terminal and the base station in the wireless communication method of the embodiment of the present invention. These two types of program code are recorded as terminal function implementation program code and base station function implementation program code. In the embodiment of the present invention, the terminal and the base station can refer to the structure diagram, and store the terminal function implementation program code and the base station function implementation program code respectively. Thereafter, the terminal and the base station can cooperate with each other to implement the wireless communication method of the embodiment of the present invention.

In a specific implementation, the wireless communication device 50 may further include: a connection line 500, a transmission circuit 503, a receiving circuit 504, an antenna 505, and an input/output (I/O) interface 506.

The transmit and receive circuits can be coupled to an antenna and wirelessly coupled to other communication devices. The transmitting circuit and the receiving circuit can also be integrated into one transceiver, and the antenna can be an RF antenna supporting multiple frequencies. The I/O interface provides the possibility to interact with other communication devices or users. For example, for a base station, the I/O interface may be a common public radio interface (CPRI) interface, an Ethernet interface, a USB interface, or the like. For the terminal, the I/O interface can be a screen, a keyboard, a microphone, a speaker, a USB interface, and the like. The various components within the wireless communication device 50 can be coupled together by various connection lines, such as a bus system. The bus system can include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like. However, for the sake of clarity, various buses are collectively referred to herein as bus systems.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the base station 60 includes a sending module 601, a processing module 602, and a receiving module 603.

The sending module 601 is configured to send a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, The preamble transmission configuration information is used to indicate a transmission configuration of the radio access preamble;

The processing module 602 and the receiving module 603 are configured to detect a wireless access preamble on multiple uplink carriers.

The processing module 602 is further configured to: determine an uplink carrier in an uplink carrier that detects the same radio access preamble, and set a radio access response message according to the determined identifier information of the uplink carrier;

The sending module 601 is further configured to send the wireless access response message on a downlink carrier.

The sending module 601 can be a transmitter, the processing module 602 can be a processor, and the receiving module 603 can be a receiver. It should be understood that the base station 60 can be used to implement the steps of the base station in the wireless communication method of the embodiment of the present invention. For related features, reference may be made to the above, and details are not described herein again.

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 7, the terminal 70 includes a sending module 701, a processing module 702, and a receiving module 703.

The receiving module 703 is configured to receive a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble The transmission configuration information is used to indicate a transmission configuration of the radio access preamble;

The sending module 701 is configured to send a radio access preamble on an uplink carrier.

The processing module 702 and the receiving module 703 are further configured to detect a radio access response message on the downlink carrier, and thereby determine an uplink carrier indicated by the network.

The sending module 701 can be a transmitter, the processing module 702 can be a processor, and the receiving module 703 can be a receiver. It should be understood that the terminal 70 can be used to implement the steps of the terminal in the wireless communication method of the embodiment of the present invention. For related features, reference may be made to the above, and details are not described herein again.

In the present application, a processor refers to a device or circuit having a computing processing capability, which may be referred to as a chip or a central processing unit (CPU). The above processor may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, or a transistor logic device, a discrete hardware component for general processing. , microprocessor. The processor can be integrated in a system on chip (SOC)

Memory refers to a device or circuit that has data or information storage capabilities and provides instructions and data to the processor. The memory includes Read-Only Memory (ROM), Random Access Memory (RAM), Non-Volatile Random Access Memory (NVRAM), programmable read-only memory or electrically erasable programmable Memory, registers, etc.

It should be understood that the above description is a specific embodiment of the present invention, and the scope of protection of the present invention is not limited thereto. The above structural diagram shows only one logical function division. In specific implementation, there may be another physical division manner, such as multiple logic modules being embodied as one physical module, or one logical module being split into multiple physical modules. It will be readily apparent to those skilled in the art that various equivalent modifications and substitutions are possible within the scope of the present disclosure.

Claims

A wireless communication method, the method being performed by a terminal, comprising:

Receiving a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information is used to indicate wireless connection The transmission configuration of the preamble;

Transmitting a radio access preamble on the uplink carrier;

A radio access response message is detected on the downlink carrier, thereby determining an uplink carrier indicated by the network.
The method according to claim 1, wherein the detecting the radio access response message on the downlink carrier, thereby determining the uplink carrier indicated by the network, comprises:

The radio access response message is detected, and the radio access response message includes the identifier information of the uplink carrier, and the uplink carrier identified by the identifier information is determined as the uplink carrier indicated by the network.
The method according to claim 1, wherein the detecting the radio access response message on the downlink carrier, thereby determining the uplink carrier indicated by the network, comprises:

The control information of the radio access response message is detected, and the control information includes the identifier information of the uplink carrier, and the uplink carrier identified by the identifier information is determined as the uplink carrier indicated by the network.
The method of claim 3 wherein:

The uplink carrier indicated by the network does not belong to the multiple uplink carriers, and the method further includes:

Stop receiving the wireless access response message indicated by the control information.
A method according to claim 2 or 3, characterized in that:

The uplink carrier indicated by the network belongs to the multiple uplink carriers, and the method further includes:

Transmitting a wireless connection setup request message on the uplink carrier indicated by the network, the wireless connection setup request message being used to request to establish a wireless connection with the network.
The method according to claim 1, wherein the detecting the radio access response message on the downlink carrier, thereby determining the uplink carrier indicated by the network, comprises:

The control information of the radio access response message is detected based on the identification information of an uplink carrier, and the uplink carrier is determined as the uplink carrier indicated by the network.
The method of claim 6 further comprising:

Transmitting a wireless connection setup request message on the uplink carrier indicated by the network, the wireless connection setup request message being used to request to establish a wireless connection with the network.
The method according to claim 5 or 7, further comprising:

And receiving, on the downlink carrier, a wireless connection setup complete message, where the wireless connection setup complete message is used to indicate configuration information of the wireless connection between the terminal and the network.
The method of claim 8 further comprising:

Determining that the wireless connection with the network is successfully established, where the downlink carrier and the uplink carrier indicated by the network are a downlink primary carrier and an uplink primary carrier, respectively.
The method according to claim 1, wherein the detecting the radio access response message on the downlink carrier, thereby determining the uplink carrier indicated by the network, comprises:

After the identification information of all the uplink carriers indicated by the system message is tried, the control information of the radio access response message cannot be detected, thereby determining that the current radio access attempt fails.
A method of wireless communication, the method being performed by a base station, comprising:

Sending a system message on the downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information is used to indicate wireless connection The transmission configuration of the preamble;

After detecting the radio access preamble on the uplink carrier, setting a radio access response message according to the identifier information of the uplink carrier, and transmitting the radio access response message on the downlink carrier.
The method according to claim 11, wherein the setting the radio access response message according to the identifier information of the uplink carrier comprises:

The identifier information of the uplink carrier is carried in the radio access response message.
The method according to claim 11, wherein the setting the radio access response message according to the identifier information of the uplink carrier comprises:

The identifier information of the uplink carrier is carried in the control information of the radio access response message, where the control information is used to indicate the transmission configuration of the radio access response message.
The method according to claim 11, wherein the setting the radio access response message according to the identifier information of the uplink carrier comprises:

The control information of the radio access response message is scrambled by using the identifier information of the uplink carrier, where the control information is used to indicate a transmission configuration of the radio access response message.
A method according to any one of claims 11 to 14, wherein:

Transmitting a plurality of different system messages on multiple downlink carriers;

The plurality of different system messages indicate at least one of the same uplink carriers, but the transmission configurations of the radio access preambles indicated by the plurality of different system messages are different.
The method according to claim 15, wherein the transmission configuration of the radio access preamble indicated by the plurality of system messages is different, including one or more of the following:

The time domain resources occupied by the radio access preamble indicated by the multiple system messages are different;

The frequency domain resources occupied by the radio access preamble indicated by the multiple system messages are different;

The sets of radio access preambles to which the radio access preambles indicated by the plurality of system messages belong are different.
The method according to any one of claims 11 to 16, wherein the transmitting the radio access response message on a downlink carrier comprises:

Determining, according to the detected transmission configuration of the radio access preamble, a system message indicating the transmission configuration of the radio access preamble;

Transmitting the wireless access response message on a downlink carrier that has sent the system message.
The method according to any one of claims 11 to 17, further comprising:

A wireless connection setup request message is received on the determined uplink carrier, the wireless connection setup request message being used to request to establish a wireless connection.
The method of claim 18, further comprising:

And transmitting a wireless connection establishment complete message on the downlink carrier, where the wireless connection establishment complete message is used to indicate configuration information of the wireless connection between the terminal and the network.
A method according to any one of claims 11 to 19, characterized in that:

The downlink carrier transmitting the system message does not belong to the licensed spectrum of the Long Term Evolution (LTE) system;

Among the plurality of uplink carriers indicated by the system message, at least one uplink carrier belongs to an authorized spectrum of the LTE system.
A terminal, comprising:

a receiver, configured to receive a system message on a downlink carrier, where the system message includes uplink carrier configuration information and preamble transmission configuration information, where the uplink carrier configuration information is used to indicate multiple uplink carriers, and the preamble transmission configuration information a transmission configuration for indicating a radio access preamble;

a processor, configured to send a radio access preamble on an uplink carrier;

The processor and the receiver are further configured to detect a radio access response message on the downlink carrier, and thereby determine an uplink carrier indicated by the network.
A terminal, comprising:

a processor, and a memory coupled to the processor, the memory storing program code, the terminal implementing any one of claims 1 to 10 when the program code is executed by the processor method.
A processor, comprising:

An interface unit, a processing unit, and a storage unit, wherein the program code is stored in the storage unit, and when the program code is decoded and executed by the processing unit, the method of any one of claims 1 to 10 is implemented.
A computer readable storage medium characterized by:

The computer readable storage medium stores program code, and when the program code is executed by a processor, implements the method of any one of claims 1 to 10.
A computer program product characterized by:

The method of any one of claims 1 to 10 is implemented when the program code embodied by the computer program product is executed by a processor.