A method and device for sending and receiving information

Abstract

A method and device for sending and receiving information, relating to the field of communication technology. The method comprises: a terminal device sends a random access preamble on a first uplink carrier; the terminal device receives first information, the first information includes carrier indication information, the carrier indication information is used to indicate a second uplink carrier used by message 3 in the random access process, the second uplink carrier is different from the first uplink carrier; the terminal device sends message 3 in the random access process on the second uplink carrier. Therefore, by instructing the terminal device to switch the uplink carrier to transmit message 3 during the random access process, it is helpful to solve the problem of access failure of some terminal devices due to limited uplink resources and a large number of terminal devices.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and device for sending and receiving information. Background Art

[0002] The International Telecommunication Union (ITU) has defined three major application scenarios for the fifth-generation mobile communication system new radio (5G new radio, 5G NR) and future mobile communication systems: enhanced mobile broadband (eMBB), ultra reliable and low latency communications (URLLC) and massive machine type communications (mMTC). These services have increasingly higher requirements for the amount of transmitted data, transmission rate, latency, etc.

[0003] In order to enhance uplink coverage and increase uplink capacity, 5G NR introduces a supplementary uplink carrier (SUL carrier). Figure 1 As shown, the cell covered by the wireless signal of the base station includes a time division duplexing (TDD) downlink carrier (DL) and two uplink carriers (UL), namely a normal uplink carrier (NUL carrier) and a SUL carrier. The frequency of the NUL carrier is higher, and the penetration loss and distance loss of signal transmission are greater. Its uplink coverage is smaller than the downlink coverage, which will reduce the success rate of cell edge terminal devices accessing the cell. The frequency of the SUL carrier is lower, and it can supplement the uplink coverage of the NUL carrier to a certain extent. The terminal device chooses to perform random access on the NUL carrier or the SUL carrier.

[0004] At present, in 5G NR, the terminal device selects the NUL carrier or SUL carrier by comparing the measured RSRP value and the pre-configured RSRP threshold value, which may cause multiple terminal devices to select the same uplink carrier for random access. When the uplink resources are limited and there are many terminal devices, some terminal devices fail to access. In the future evolution of communication technology, how to solve the problem of some terminal devices failing to access due to limited uplink resources and a large number of terminal devices is still an important issue that needs to be solved urgently. Summary of the invention

[0005] The embodiments of the present invention provide a method and device for sending and receiving information, which are helpful to solve the problem that the uplink resources are limited and there are many terminal devices, resulting in the access failure of some terminal devices.

[0006] In a first aspect, an embodiment of the present application provides an information sending method, the method comprising: a terminal device sends a random access preamble code on a first uplink carrier; the terminal device receives first information, the first information comprising carrier indication information, the carrier indication information being used to indicate a second uplink carrier used by message 3 in the random access process, the second uplink carrier being different from the first uplink carrier; the terminal device sends the message 3 on the second uplink carrier.

[0007] The above design can be applied to the contention based random access (CBRA) process. Message 3 is the third message of the random access process. Message 3 may also be different depending on the terminal device status and the application scenario. For example, when the terminal device is in the RRC idle state and performs initial access, message 3 is the RRCSetupRequest message; when the terminal device is in the RRC activated state and needs to resume access, message 3 is the RRCRRequest message; when the terminal device needs to re-establish RRC, message 3 is the RRCReestablishmentRequest message, etc., which will not be repeated here.

[0008] Through this design, the terminal device can switch the uplink carrier during the random access process, thereby reducing the load of the first uplink carrier used to send the random access preamble code, and trying to solve the problem of heavy load on the first uplink carrier. In addition, if the first uplink carrier selected by the terminal device to send the random access preamble code is severely interfered or the channel quality is poor, by allowing the terminal device to switch carriers during the random access process, excessive retransmission of message 3 can be avoided to a certain extent, thereby reducing network transmission delay. In addition, by allowing the terminal device to switch the uplink carrier in message 3 sent during the random access process, more resources can be allocated to the terminal, which helps to achieve rapid access of the terminal device.

[0009] In an optional implementation, the first information is downlink control information DCI, wherein the format of the DCI is 0_0.

[0010] Through this design, the terminal device can obtain the carrier indication information in the DCI format 0_0 used for scheduling the retransmission of message 3, and resend the message 3 according to the carrier indication. According to the carrier indication information, the second uplink carrier used for retransmitting message 3 can be different from the first uplink carrier used for sending the random access preamble code, which helps to alleviate the load of the first uplink carrier, or when the first uplink carrier is severely interfered with and the channel quality is poor, by switching the uplink carrier, it helps to avoid the problem of network transmission delay caused by excessive retransmission of message 3.

[0011] In an optional implementation manner, the first information is a random access response uplink authorization.

[0012] Through this design, the terminal device can obtain the carrier indication information in the random access response used for the initial transmission of message 3, and then initially send message 3 according to the carrier indication. According to the carrier indication information, the second uplink carrier used for the initial transmission of message 3 can be different from the first uplink carrier used for sending the random access preamble code, which helps to alleviate the load of the first uplink carrier, or when the first uplink carrier is severely interfered with and the channel quality is poor, by switching the uplink carrier, it helps to avoid the problem of network transmission delay caused by the retransmission of message 3 due to the inability of message 3 to be correctly received by the network device.

[0013] In an optional implementation, before the terminal device receives the first information, the method further includes: the terminal device sends a previous transmission of the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0014] Through this design, the terminal device can send message 3 on the third uplink carrier, and the third uplink carrier can be different from the first uplink carrier and / or the second uplink carrier. This helps to alleviate the load of the first uplink carrier, or when the first uplink carrier is severely interfered with and the channel quality is poor, by switching the uplink carrier, it helps to avoid the problem of network transmission delay caused by the retransmission of message 3 due to the inability of message 3 to be correctly received by the network device.

[0015] In an optional implementation, before the terminal device receives the first information, the method also includes: the terminal device receives a random access response uplink authorization, and the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0016] Through this design, the terminal device can receive the random access response uplink authorization, and send message 3 on the third uplink carrier according to the indication of the random access response uplink authorization. The third uplink carrier can be different from the first uplink carrier and / or the second uplink carrier. By switching the uplink carrier, it helps to alleviate the load of the first uplink carrier. At the same time, when the first uplink carrier is severely interfered with and the channel quality is poor, by switching the uplink carrier, it helps to avoid the problem of network transmission delay caused by the inability of message 3 to be correctly received by the network device.

[0017] In an optional implementation, the first information is downlink control information DCI, and the carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or the carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

[0018] Through this design, the carrier indication information is configured at different bit positions in the DCI format 0_0 of the downlink control information DCI, so that the terminal device can obtain the carrier indication information from the DCI through a corresponding reading method, and then can transmit the message 3 in the random access process on the corresponding uplink carrier according to the carrier indication information. It should be understood that in the case where the terminal device is not instructed to switch the uplink carrier during the random access process, the corresponding position in the DCI format 0_0 of the DCI can also be configured with carrier indication information, such as the last valid bit in the DCI format 0_0, which is used to instruct the terminal device to send message 3 on the first uplink carrier that sends the random access preamble.

[0019] In an optional implementation, the terminal device indicates to the network device that the uplink carrier supported by the terminal device to carry the message 3 is different from the first uplink carrier.

[0020] Through this design, the terminal device can report its own capability information to the network device, so that the network device can schedule the uplink carrier carrying message 3 for the terminal device during the random access process of the terminal device, so as to alleviate the load of the first uplink carrier that sends the random access preamble code, or reduce the network transmission delay caused by the poor channel quality of the first uplink carrier due to severe interference.

[0021] In an optional implementation manner, the cell identifiers of the serving cells where the first uplink carrier and the second uplink carrier are located are the same; or the first uplink carrier and the second uplink carrier are configured by SIB1.

[0022] In an optional implementation manner, the serving cells where the first uplink carrier, the second uplink carrier and the third uplink carrier are located have the same cell identifier; or the first uplink carrier, the second uplink carrier and the third uplink carrier are configured by SIB1.

[0023] Through this design, multiple uplink carriers can be configured for terminal devices in the same cell to increase uplink coverage, thereby enabling the terminal devices to obtain more uplink resources during random access.

[0024] In an optional implementation, the terminal device does not send uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

[0025] Due to the different capabilities of different terminal devices, the radio frequency chains of two or more uplink carriers supported by a terminal device with stronger capabilities (for example, a terminal supporting two or more antenna ports) are pre-configured, and the uplink transmission of the terminal device does not require switching time when switching the radio frequency chain, and can achieve 0ms switching. However, when the uplink transmission of a terminal with weaker capabilities (for example, a terminal supporting only one antenna port) switches the radio frequency chain, there is an interruption time for implementing carrier switching, that is, the switching time interval. Therefore, the uplink transmission of terminal devices with different capabilities is not aligned in time. Since the terminal device cannot report its own capabilities to the network device during the random access process, the network device cannot obtain the uplink transmission of the terminal device accordingly according to the capabilities of the terminal device. Through this design, regardless of whether the terminal device has stronger or weaker capabilities, it is designed that the terminal device does not send uplink transmission on the two uplink carriers before and after the switching within the predetermined time interval of switching the uplink carrier during the random access process. In this way, the network device can uniformly indicate the uplink transmission of terminal devices with different capabilities according to the lowest UE capability, and reserve the switching time when switching the carrier. As a result, it helps the communication system to be compatible with terminal devices with weaker capabilities.

[0026] In a second aspect, an embodiment of the present application provides an information receiving method, the method comprising: a network device receives a random access preamble code sent on a first uplink carrier; the network device sends first information, the first information comprising carrier indication information, for indicating a second uplink carrier used by message 3 in the random access process, the second uplink carrier being different from the first uplink carrier; the network device receives message 3 in the random access process sent on the second uplink carrier.

[0027] In an optional implementation, the first information is downlink control information DCI, wherein the format of the DCI is 0_0.

[0028] In an optional implementation manner, the first information is a random access response uplink authorization.

[0029] In an optional implementation, before the network device sends the first information, the method further includes: the network device receives the message 3 sent on a third uplink carrier, and the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0030] In an optional implementation, before the network device sends the first information, the method also includes: the network device sends a random access response uplink authorization to the terminal device, and the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0031] In an optional implementation, the first information is downlink control information DCI, and the carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or the carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

[0032] In an optional implementation, the method further includes: the network device obtains an indication from the terminal device: the second uplink carrier supported by the terminal device for carrying the message 3 is different from the first uplink carrier.

[0033] In an optional implementation manner, the cell identifiers of the serving cells where the first uplink carrier and the second uplink carrier are located are the same; or the first uplink carrier and the second uplink carrier are configured by SIB1.

[0034] In an optional implementation manner, the serving cells where the first uplink carrier, the second uplink carrier and the third uplink carrier are located have the same cell identifier; or the first uplink carrier, the second uplink carrier and the third uplink carrier are configured by SIB1.

[0035] In an optional implementation, the network device does not receive uplink transmission of the terminal device on the first uplink carrier and the second uplink carrier within a predetermined time interval before receiving message 3.

[0036] In the third aspect, an embodiment of the present application provides an information sending device, including a communication unit; the communication unit is used to send a random access preamble code on a first uplink carrier; the communication unit is also used to receive first information, the first information includes carrier indication information, and the carrier indication information is used to indicate a second uplink carrier used by message 3 in the random access process, and the second uplink carrier is different from the first uplink carrier; the communication unit is also used to send message 3 in the random access process on the second uplink carrier.

[0037] In an optional implementation, the first information is downlink control information DCI, wherein the format of the DCI is 0_0.

[0038] In an optional implementation manner, the first information is a random access response uplink authorization.

[0039] In an optional implementation, the communication unit is further used to: before receiving the first information, send a previous transmission of the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0040] In an optional implementation, the communication unit is also used to: before receiving the first information, receive a random access response uplink authorization, and the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0041] In an optional implementation, the first information is downlink control information DCI, and the carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or the carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

[0042] In an optional implementation, the communication unit is further used to: indicate to the network device that the uplink carrier supported by the terminal device to carry the message 3 is different from the first uplink carrier.

[0043] In an optional implementation manner, the cell identifiers of the serving cells where the first uplink carrier and the second uplink carrier are located are the same; or the first uplink carrier and the second uplink carrier are configured by SIB1.

[0044] In an optional implementation manner, the serving cells where the first uplink carrier, the second uplink carrier and the third uplink carrier are located have the same cell identifier; or the first uplink carrier, the second uplink carrier and the third uplink carrier are configured by SIB1.

[0045] In an optional implementation, the communication unit does not send uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

[0046] In a fourth aspect, an embodiment of the present application provides an information receiving device, comprising a communication unit; the communication unit is used to receive a random access preamble code sent on a first uplink carrier; the communication unit is also used to send first information, the first information including carrier indication information, used to indicate a second uplink carrier carrying message 3 in a random access process, the second uplink carrier being different from the first uplink carrier; the communication unit is also used to receive message 3 in the random access process sent on the second uplink carrier.

[0047] In an optional implementation, the first information is downlink control information DCI, wherein the format of the DCI is 0_0.

[0048] In an optional implementation manner, the communication unit is further used to: before sending the first information, receive the message 3 sent on a third uplink carrier, where the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0049] In an optional implementation, the communication unit is also used to: before sending the first information, send a random access response uplink authorization to the terminal device, and the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0050] In an optional implementation, the first information is downlink control information DCI, and the carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or the carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

[0051] In an optional implementation, the communication unit is further used to: obtain an indication from a terminal device: the second uplink carrier supported by the terminal device for carrying the message 3 is different from the first uplink carrier.

[0052] In an optional implementation manner, the cell identifiers of the serving cells where the first uplink carrier and the second uplink carrier are located are the same; or the first uplink carrier and the second uplink carrier are configured by SIB1.

[0053] In an optional implementation manner, the serving cells where the first uplink carrier, the second uplink carrier and the third uplink carrier are located have the same cell identifier; or the first uplink carrier, the second uplink carrier and the third uplink carrier are configured by SIB1.

[0054] In an optional implementation manner, the communication unit does not receive uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before receiving message 3.

[0055] In a fifth aspect, an embodiment of the present application provides an information sending device, comprising: a processor and an interface circuit, wherein the processor is used to communicate with a network device through the interface circuit and execute the method described in the first aspect above.

[0056] In a sixth aspect, an embodiment of the present application provides an information receiving device, comprising: a processor and an interface circuit, wherein the processor is used to communicate with a terminal device through the interface circuit and execute the method described in the second aspect above.

[0057] In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, comprising a computer program, which, when executed on a computer, enables the computer to execute the methods described in the first and second aspects above.

[0058] In an eighth aspect, an embodiment of the present application provides a computer program product, which includes a computer program. When the computer program runs on a computer, the computer executes the methods described in the first and second aspects above.

[0059] In a ninth aspect, the present application also provides a chip system, comprising: a processor for executing the methods described in the above aspects.

[0060] In the tenth aspect, the present application also provides a communication system, comprising: a terminal device for executing any method described in the first aspect above and a network device for executing any method described in the second aspect above.

[0061] Based on the implementations provided in the above aspects, the present application can also be further combined to provide more implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A schematic diagram of wireless signal coverage in 5G NR;

[0063] Figure 2A schematic diagram of the architecture of a mobile communication system provided by one embodiment of the present application;

[0064] Figure 3 A schematic diagram of the architecture of a mobile communication system provided by another embodiment of the present application;

[0065] Figure 4 A flowchart of a method for sending and receiving information provided by an embodiment of the present application;

[0066] Figure 5 A schematic diagram of wireless signal coverage provided by an embodiment of the present application;

[0067] Figure 6 A flowchart of a method for sending and receiving information provided by another embodiment of the present application;

[0068] Figure 7 A schematic diagram of an information sending device provided by this application;

[0069] Figure 8 A schematic diagram of an information receiving device provided by this application;

[0070] Fig. 9 A schematic diagram of a device provided for this application. DETAILED DESCRIPTION

[0071] In a wireless communication system, in order to establish a connection with a network device and request the network device to allocate corresponding dedicated resources to the terminal device for normal service transmission, the terminal device usually first performs random access to the network device. The terminal device establishes a connection with the cell and obtains uplink synchronization through the random access process, and then performs subsequent communications.

[0072] The scenario in which the terminal device triggers random access includes any of the following scenarios:

[0073] Scenario 1: Initial radio resource control (RRC) connection establishment of a terminal device. When the terminal device switches from an idle state to a connected state, the terminal device initiates a random access.

[0074] Scenario 2: Terminal device RRC connection reestablishment. When the RRC connection fails and the terminal device needs to reestablish the RRC connection, the terminal device will initiate random access.

[0075] Scenario 3: When the terminal device performs cell switching, the terminal device initiates random access in the target cell.

[0076] Scenario 4: When the terminal device is in a connected state, the network device has downlink data to transmit to the terminal device (i.e., downlink data arrives). If the terminal device loses synchronization in the uplink, the network device will control the terminal device to initiate random access. The network device maintains an uplink timer. If the uplink timer times out and the network device does not receive a response signal from the terminal device, the network device considers that the terminal device loses synchronization in the uplink.

[0077] Scenario 5: When the terminal device is in a connected state, the terminal device has uplink data to transmit to the network device (i.e., uplink data arrives). If the terminal device loses synchronization in the uplink, the terminal device will initiate a random access. The terminal device maintains an uplink timer. If the uplink timer times out and the terminal device does not receive a command from the network device to adjust the maximum time advance (TA) value, the terminal device considers that the uplink is out of synchronization.

[0078] In 5G NR, for a service cell configured with two uplink carriers (a normal uplink NUL carrier and an auxiliary uplink SUL carrier), the terminal device can determine whether to perform random access on the NUL carrier or the SUL carrier based on the preconfigured RSRP threshold value and the RSRP measurement value. If the RSRP measurement value measured by the terminal device is higher than the preconfigured RSRP threshold value, the terminal device selects the NUL carrier for random access; otherwise, the terminal device selects the SUL carrier for random access. During the access process, the uplink transmission of the terminal device is always on the same carrier. In other words, once the terminal device selects an uplink carrier to send a random access preamble, the uplink transmission during the entire random access process must be completed on this uplink carrier. When uplink resources are limited and the number of users is large, if multiple terminal devices choose to perform random access on the same uplink carrier, conflicts will occur, resulting in access failure of some terminal devices.

[0079] In view of this, the present application provides a solution, in which the network device can schedule the terminal device to send message 3 in the random access process on an uplink carrier other than the uplink carrier that sends the random access preamble code according to the network situation, which helps to provide more uplink resources for uplink transmission and reduce access delay, thereby facilitating fast random access.

[0080] The following is a part of the embodiments of the present application for explanation and explanation to facilitate understanding by those skilled in the art.

[0081] 1) User equipment (UE) can be a wireless terminal device that can receive network device scheduling and indication information. The wireless terminal device can be a device that provides voice and / or data connectivity to the user, or a handheld device with wireless connection function, or other processing device connected to a wireless modem.

[0082] Wireless terminal devices can communicate with one or more core networks or the Internet via a radio access network (e.g., radio access network, RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones, mobile phones), computers and data cards. For example, they can be portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile devices that exchange language and / or data with the radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), tablet computers (Pads), computers with wireless transceiver functions, and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a remote station, an access point (AP), a remote terminal, an access terminal, a user terminal, a user agent, a subscriber station (SS), a customer premises equipment (CPE), a terminal, a user equipment (UE), a mobile terminal (MT), etc. The wireless terminal device may also be a wearable device and a next generation communication system, for example, a terminal device in a 5G network or a terminal device in a future evolved public land mobile network (PLMN) network, a terminal device in an NR communication system, etc.

[0083] The terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on the water surface; it can also be deployed on aircraft, drones, balloons and satellites in the air. The embodiments of the present application do not limit the application scenarios of the wireless access network device and the terminal device.

[0084] 2) Network equipment is an entity on the network side used to transmit or receive signals, such as a new generation base station (generation Node B, gNodeB).

[0085] A network device may be a device for communicating with a mobile device. A network device may be an AP in a wireless local area network (WLAN), a base transceiver station (BTS) in a global system for mobile communication (GSM) or code division multiple access (CDMA), a base station (NodeB, NB) in a wideband code division multiple access (WCDMA), an evolutionary Node B (eNB or eNodeB) in a long term evolution (LTE), or a relay station or access point, or a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved public land mobile network (PLMN) network, or a gNodeB in an NR system, etc. In addition, in an embodiment of the present application, the network device provides services for a cell, and the terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell may be a cell corresponding to the network device (e.g., a base station), and the cell may belong to a macro base station or a base station corresponding to a small cell. The small cell here may include: a metro cell, a micro cell, a pico cell, a femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services. In addition, in other possible cases, the network device may be other devices that provide wireless communication functions for the terminal device. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device. For the convenience of description, in an embodiment of the present application, a device that provides wireless communication functions for the terminal device is referred to as a network device.

[0086] 3) Message 3, namely Msg3. In contention-based random access, message 3 and message 4 are used to eliminate conflicts. Message 3 is carried on PUSCH, and the initial transmission of message 3 is scheduled by RAR UL grant. The retransmission of message 3 is scheduled by DCI format 0_0 scrambled by TC-RNTI. Prior to this, the UE obtains TC-RNTI by receiving the corresponding RAR information. Message 4 is a PDSCH scheduled by DCI format 1_0 scrambled by TC-RNTI, and the PDSCH contains a conflict resolution ID.

[0087] 4) Scrambling: multiplying the spread spectrum code with a pseudo-random code sequence to encrypt the signal, wherein the pseudo-random code sequence can be understood as the scrambling code of the present application, and the scrambling code can be used for scrambling and descrambling. Furthermore, scrambling the downlink control information (DCI) or the physical downlink control channel (PDCCH) can mean scrambling the CRC field of the downlink control information DCI. Accordingly, the terminal device descrambles the PDCCH, which means descrambling the CRC field using the corresponding type of radio network temporary identifier (RNTI) to determine the format or type of the DCI, etc.

[0088] 5) In this application, "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0089] The term "plurality" in this application refers to two or more.

[0090] In addition, it should be understood that in the description of this application, words such as "first", "second", and "third" are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0091] like Figure 2 , which is a schematic diagram of the architecture of a mobile communication system applied in an embodiment of the present application.

[0092] The mobile communication system includes a core network device 210, a wireless access network device 220 and a terminal device 230 (such as Figure 2 Terminal device a and terminal device b).

[0093] The core network device 210 and the wireless access network device 220 can both be referred to as network devices. The terminal device 230 is connected to a wireless access network device by wireless means, and the wireless access network device is connected to the core network device by wireless or wired means. In other scenarios, the terminal device 230 can be connected to multiple wireless access network devices by wireless means, see Figure 3 shown.

[0094] The core network device 210 and the wireless access network device 220 may be independent and different physical devices, or the logical functions of the core network device 210 and the wireless access network device 220 may be integrated on the same physical device, or part of the functions of the core network device 210 and part of the functions of the wireless access network device 220 may be integrated on one physical device.

[0095] The terminal device 230 may be fixed in position or movable. Figure 2 and Figure 3 This is just a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 2 The embodiments of the present application do not limit the number of core network devices, wireless access network devices and terminal devices included in the mobile communication system.

[0096] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) system, worldwide interoperability for microwave access (WiMAX) communication system, future fifth generation (5G) system, such as new generation radio access technology (NR), and future communication systems such as 6G system.

[0097] In addition, in the embodiments of the present application, the word "exemplary" is used to indicate an example, illustration or description. Any embodiment or implementation described as "exemplary" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or implementations. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0098] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0099] In the embodiment of the present application, the network device may support multiple random access methods, such as the four-step random access method (4-step RACH) currently supported by both the terminal device and the network device. With the development of communication technology, more other random access methods will appear in the future, and the multiple random access methods described here may be included. In addition, it should be noted that the four-step random access method and the four-step random access process of the present application have the same meaning.

[0100] In order to avoid the problem of random access failure caused by resource conflicts used by multiple terminal devices in the random access process in the traditional solution, the embodiment of the present application provides a method for sending and receiving information. This method can be applied to Figure 2 or Figure 3 The communication system shown below Figure 4 The information sending and receiving method flow chart shown in the figure describes the specific steps of the method in detail.

[0101] S401: The network device configures a set of preamble codes available to the terminal device, and broadcasts the PRACH resource configuration information of N uplink carriers to the terminal devices in the entire cell through system messages, including the root sequence and cyclic shift parameters of the random access preamble code (preamble), and PRACH transmission parameters. The PRACH transmission parameters include, for example: PRACH preamble format, time domain resources and frequency domain resources of PRACH transmission, and N is a positive integer greater than or equal to 2.

[0102] The network device may also broadcast at least one threshold value to the terminal devices in the cell through a system message. The terminal device may select a random access preamble for random access based on the received system message, and determine the first uplink carrier for sending the random access preamble, and then perform random access. It should be noted that the system message may be, for example, a high-level parameter UplinkConfigCommon, UplinkConfigCommonSIB, or RACH-configCommon, etc. The random access preamble sent is any preamble selected by the terminal device from the preamble set configured in the network device, and this application does not limit this.

[0103] The above N uplink carriers are configured by the network device for the terminal device in the same cell, and may include a normal uplink NUL carrier and / or a supplementary uplink SUL carrier, and the uplink coverage of the SUL carrier may supplement the uplink coverage of the NUL carrier. The N uplink carriers may be configured according to application scenarios or business requirements, etc., and this application does not limit this.

[0104] In one example, the N uplink carriers may include at least two uplink carriers, including a normal uplink NUL carrier and / or a supplementary uplink SUL carrier, that is, it is not distinguished whether the N uplink carriers are specifically NUL carriers or SUL carriers.

[0105] In another example, the N uplink carriers may include at least one normal uplink NUL carrier and at least one supplementary uplink SUL carrier, for example, including but not limited to any combination of the following:

[0106] ① One NUL carrier and one SUL carrier;

[0107] ②One NUL carrier and at least one SUL carrier;

[0108] ③One SUL carrier and at least one NUL carrier;

[0109] ④ At least two NUL carriers and at least two SUL carriers, etc.

[0110] In these combinations, the NUL carrier may represent a high-frequency TDD carrier, including but not limited to the 3.5 GHz C band. The SUL carrier may represent a low-frequency FDD uplink band, including but not limited to the 1.8 GHz, sub1G band. Alternatively, the SUL carrier may also represent a low-frequency TDD band: for example, 2.0 GHz, 2.6 GHz, etc. Alternatively, the SUL carrier may also represent a high-frequency TDD band, such as 4.9 GHz.

[0111] Therefore, by configuring multiple uplink carriers for the terminal device to enhance uplink coverage, increase uplink capacity, and provide more uplink resources for uplink transmission, it is convenient for terminal devices with corresponding capabilities to switch uplink carriers during random access, so as to avoid access failure or access delay caused by heavy load on the first uplink carrier or poor channel quality.

[0112] It should be noted that, due to the different capabilities of different terminal devices, the radio frequency chains of two or more uplink carriers supported by a terminal device with stronger capabilities (for example, a terminal supporting two or more antenna ports) are pre-configured, and the uplink transmission of the terminal device does not require switching time when switching the radio frequency chain, and can achieve 0ms switching. When the uplink transmission of a terminal with weaker capabilities (for example, a terminal supporting only one antenna port) switches the radio frequency chain, there is an interruption time for implementing carrier switching, that is, a switching time interval. Therefore, the uplink transmissions of terminal devices with different capabilities are not aligned in time. Since the terminal device cannot report its own capabilities to the network device during the random access process, the network device cannot obtain the uplink transmission of the terminal device accordingly according to the capabilities of the terminal device. Therefore, in an embodiment of the present application, it can also be designed that the terminal device does not send uplink transmissions on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3. Through this design, regardless of whether the terminal device has stronger or weaker capabilities, it is designed that the terminal device does not send uplink transmissions on the two uplink carriers before and after the switching within a predetermined time interval for switching the uplink carrier during the random access process. In this way, the network equipment can uniformly indicate the uplink transmission of terminal devices with different capabilities according to the lowest UE capability, and reserve switching time when switching carriers. This helps the communication system to be compatible with terminal devices with weaker capabilities. In the following description, when the terminal device switches the uplink carrier during the random access process, it is designed not to send uplink transmission on the two uplink carriers to be switched within a predetermined time interval, which will not be repeated below.

[0113] S402: The terminal device selects a suitable carrier from N uplink carriers as a first uplink carrier for sending a random access preamble (Random access preamble) according to the at least one threshold value.

[0114] S403: The terminal device sends a random access preamble code, ie, message 1, on the first uplink carrier.

[0115] The at least one threshold value mentioned above may be a reference signal received power (RSRP) threshold value. The terminal device may select an accessed cell by detecting a downlink synchronization signal (e.g., a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS)), and obtain an RSRP measurement value measured based on the downlink synchronization signal. Then, based on the relationship between the RSRP measurement value and at least one RSRP threshold value, a suitable carrier is selected from N uplink carriers as the first uplink carrier for sending a random access preamble.

[0116] Alternatively, the at least one threshold value may be a distance threshold between the location of the terminal device and the location of the network device, and one distance threshold may correspond to the maximum coverage range of an uplink carrier. The terminal device may, for example, obtain its own location information through positioning technology, and then obtain a measured value of the distance between its own location and the location of the network device. Then, based on the relationship between the distance measurement value and at least one distance threshold value, a suitable carrier is selected from N uplink carriers as the first uplink carrier for sending a random access preamble.

[0117] Next, combine Figure 5 Taking the combination of uplink carriers shown as an example, it is briefly introduced how the terminal device determines the first uplink carrier for sending the random access preamble code according to at least one threshold value.

[0118] like Figure 5 As shown, the N uplink carriers may include a NUL carrier, a SUL#1 carrier, and a SUL#2 carrier, the frequencies of which decrease in sequence, and their uplink coverage gradually extends from the center of the cell to the edge of the cell. It should be understood that Figure 5 This is only an illustrative description and not a limitation. In other embodiments, the uplink coverage of N uplink carriers may be presented as, for example, a SUL carrier and a NUL carrier extending gradually from the cell center to the cell edge, and this application does not limit this.

[0119] In one example, the at least one threshold value may include an RSRP threshold value. The terminal device determines whether it is located in the cell center or at the cell edge by comparing the magnitude relationship between the RSRP measurement value and the RSRP threshold value, so as to determine whether the carrier type of the first uplink carrier to be selected is a NUL carrier or a SUL carrier. Then, an uplink carrier is selected from the corresponding type of carriers as the first uplink carrier for transmitting the random access preamble. Specifically, if the RSRP measurement value is greater than the RSRP threshold value, the terminal device determines to transmit the random access preamble on the NUL carrier, so the NUL carrier can be selected as the first uplink carrier. If the RSRP measurement value is less than the RSRP threshold value, the terminal device determines to transmit the random access preamble on the SUL carrier, then the SUL#1 carrier or the SUL#2 carrier can be selected as the first uplink carrier.

[0120] In another example, the at least one threshold value may include N - 1 RSRP threshold values, where N is the number of uplink carriers configured by the network device, which is the total number of NUL carriers and SUL carriers. There is one RSRP threshold value set between every two adjacent frequency bands of uplink carriers, for a total of N - 1 RSRP threshold values. The terminal device can compare the RSRP measurement value with the N - 1 RSRP threshold values level by level until the first uplink carrier for transmitting the random access preamble is determined.

[0121] Reference Figure 5 , the at least one threshold value includes the RSRP threshold value #1 and the RSRP threshold value #2 respectively configured for the NUL carrier, the SUL#1 carrier and the SUL#2 carrier. Among them, the magnitude relationship between the RSRP value ranges corresponding to the NUL carrier, the SUL#1 carrier and the SUL#2 carrier and the configured RSRP threshold values is:

[0122] SUL#2 < RSRP threshold value #2 < SUL#1 < RSRP threshold value #1 < NUL;

[0123] The terminal device can compare the RSRP measurement value with the RSRP threshold value #1 and the RSRP threshold value #2 to determine the RSRP value range corresponding to the RSRP measurement value, so as to determine the corresponding uplink carrier.

[0124] Specifically, if the RSRP measurement value is greater than the RSRP threshold value #1, the terminal device selects the NUL carrier as the first uplink carrier. If the RSRP measurement value is less than the RSRP threshold value #1, the terminal device can select an uplink carrier between SUL#1 and SUL#2 as the first uplink carrier. The terminal device compares the RSRP measurement value with the RSRP threshold value #2. If the RSRP measurement value is greater than the RSRP threshold value #2 and less than the RSRP threshold value #1, the SUL#1 carrier is selected as the first uplink carrier. If the RSRP measurement value is less than the RSRP threshold value #2, the SUL#2 carrier is selected as the first uplink carrier.

[0125] Alternatively, the terminal device can determine the relationship between the RSRP measurement value and N-1 RSRP threshold values, determine the minimum RSRP threshold value greater than the RSRP measurement value and the maximum RSRP threshold value less than the RSRP measurement value among the N-1 RSRP threshold values, and then select an uplink carrier with an RSRP value interval between the two RSRP threshold values ​​as the first uplink carrier.

[0126] It should be understood that the above is only Figure 5 How the terminal device selects the first uplink carrier in the embodiment of the present application is described as an example without any limitation. In other embodiments, at least one threshold value may be limited to one threshold value or N-1 threshold values. Accordingly, the way in which the terminal device selects the first uplink carrier may be limited to the above-mentioned step-by-step comparison method or the method of determining the maximum or minimum threshold value, which will not be repeated here.

[0127] S404: The network device receives the random access preamble code sent by the terminal device on the first uplink carrier, and sends first information according to the first uplink carrier. The first information includes carrier indication information for indicating the second uplink carrier used by message 3 in the random access process.

[0128] S405: The terminal device sends message 3 on the second uplink carrier.

[0129] S406: The terminal device receives the message 4 sent by the network device. The network device resolves the conflict and sends the information of the winning terminal device to the terminal device.

[0130] In an embodiment of the present application, the second uplink carrier may be the same as the first uplink carrier, or the second uplink carrier may be different from the first uplink carrier. The terminal device may be a first device with carrier switching capability during random access or a second device without carrier switching capability during random access. The terminal device may indicate its own capability information to the network device, and the network device may configure carrier indication information and the first information for the terminal device according to its own capability to schedule the uplink transmission of message 3 during random access. If the terminal device does not have the carrier switching capability during random access, the second uplink carrier indicated by the carrier indication information carried in the first information is the same as the first uplink carrier used by the terminal device to send the random access preamble. If the terminal device has the carrier switching capability during random access, the second uplink carrier indicated by the carrier indication information carried in the first information may be different from the first uplink carrier used by the terminal device to send the random access preamble.

[0131] In an embodiment of the present application, it can be indicated in a variety of ways: whether the terminal device has the ability to switch carriers during the random access process, or whether the uplink carrier carrying message 3 can be different from the first uplink carrier that sends the random access preamble code. The indication can be an explicit indication or an implicit indication, and the present application does not limit this.

[0132] In one example, the terminal device can explicitly or implicitly indicate to the network device whether the terminal device supports or allows the second uplink carrier carrying message 3 to be different from the first uplink carrier by sending the first uplink carrier used by the random access preamble. For example, if the first uplink carrier is a first-class uplink carrier, it is considered that the terminal device does not have the ability to switch carriers during the random access process, that is, the terminal device does not support or allow the uplink carrier to be switched during the random access process, and the network device determines that the second uplink carrier used by message 3 needs to be the same as the first uplink carrier. If the first uplink carrier is a second-class uplink carrier, it is considered that the terminal device has the ability to switch carriers during the random access process, that is, the terminal device supports or allows the uplink carrier to be switched during the random access process, and the network device determines that the second uplink carrier carrying message 3 can be different from the first uplink carrier. The first-class uplink carrier and the second-class uplink carrier are both carriers used for uplink transmission, and at least one of the following information of the first-class uplink carrier and the second-class uplink carrier is different: the absolute frequency of the reference resource block; the frequency band; the parameter set; the carrier offset relative to the reference resource block. As an example, the first type of uplink carrier may include a C-band TDD UL carrier or a SUL carrier with the lowest frequency (e.g., a 1.8G FDD UL carrier), and the second type of uplink carrier may include other uplink carriers except the above-mentioned C-band TDD UL carrier or the SUL carrier with the lowest frequency (e.g., a 1.8G FDD UL carrier), and this application does not limit this. It should be understood that the above only schematically illustrates how the terminal device's own capability information is notified to the network device and does not limit it in any way. In other embodiments, the terminal device may also indicate its capability information to the network device in other ways, such as through a predetermined field in message 1, through a predetermined indication message sent to the network device, etc., which will not be repeated here.

[0133] In one example, the terminal device can obtain a set of PRACH resources, and the terminal device implicitly notifies the network device whether it supports switching the radio frequency chain during the random access process by selecting the PRACH resources, or the terminal device implicitly notifies the network device whether it has the ability to switch the radio frequency chain during the random access process by selecting the PRACH resources. Among them, the set of PRACH resources includes a first type of PRACH resources and a second type of PRACH resources. If the terminal device does not support switching the radio frequency chain during the random access process or does not have the ability to switch the radio frequency chain during the random access process, the terminal device selects one of the first type of PRACH resources for sending a random access preamble. If the terminal device supports switching the radio frequency chain during the random access process or has the ability to switch the radio frequency chain during the random access process, the terminal device selects one of the second type of PRACH resources for sending a random access preamble. The network device receives the random access preamble sent by the terminal device. If the PRACH resource used to send the random access preamble is a first-category PRACH resource, it can be considered that the uplink carrier used by the indication information of the PRACH resource indicating message 3 must be the same as the first uplink carrier used to send the random access preamble; if the PRACH resource used to send the random access preamble is a second-category PRACH resource, it can be considered that the uplink carrier used by the indication information of the PRACH resource indicating message 3 may be different from the first uplink carrier used to send the random access preamble. Both the first-category PRACH resource and the second-category PRACH resource are channel resources used for random access, and at least one of the following items of the first-category PRACH resource and the second-category PRACH resource is different: PRACH preamble format; time domain resources of PRACH transmission; frequency domain resources; code domain resources. In a feasible implementation method, the above-mentioned PRACH resources can also be replaced by other information, such as a preamble sequence and its indication information, a preamble format and its indication information, etc. The terminal device can also use a preamble sequence and its indication information, or a preamble format and its indication information, etc. to indicate whether the uplink carrier used by message 3 can be different from the first uplink carrier for sending the random access preamble code, which will not be repeated here.

[0134] In one example, Figure 4 The first information in can be specifically Figure 6The random access response uplink grant (RAR UL grant) transmitted in step S604a can be used to schedule the initial transmission of message 3 in the random access process. RAR includes the time-frequency resource allocation of message 3, temporary cell-radio network temporary identity (Temporary Cell-Radio Network Temporary Identity, TC-RNTI), etc. The RA-RANT scrambled DCI is a public DCI that can be received by all terminal devices in the cell.

[0135] If the network device determines that the terminal device does not have the capability of carrier switching during the random access process, the RAR UL grant cannot be used to indicate the uplink carrier used by message 3 in the random access process; or, the uplink carrier used by message 3 indicated by the RAR UL grant is the first uplink carrier. The terminal device sends message 3 on the first uplink carrier. If the network device determines that the terminal device has the capability of carrier switching during the random access process, the uplink carrier used by message 3 indicated by the RAR UL grant is the second uplink carrier, and the second uplink carrier may be different from the first uplink carrier. After receiving the RAR UL grant, the terminal device may send message 3 to the network device on the second uplink carrier according to the indication of the RAR UL grant.

[0136] In an actual network environment, there may be situations where the network device cannot correctly receive Message 3, for example, including but not limited to: the terminal device does not receive or does not correctly receive the DCI / RAR that schedules Message 3; or the uplink carrier that sends Message 3 is subject to strong interference; or the terminal device moves (for example, from the cell center to the cell edge or from the cell edge to the cell center), etc. If the network device fails to correctly receive Message 3, it will also schedule the retransmission of Message 3.

[0137] In one example, Figure 4 The first information in can be specifically Figure 6 The downlink control information DCI transmitted in step S604b in the above embodiment is in a format of 0_0. The DCI format 0_0 can be used to schedule the retransmission of message 3, and the terminal device can resend message 3 to the network device according to the resources indicated by the DCI format 0_0. The DCI for scheduling the retransmission of message 3 can be scrambled by TC-RNTI, and the terminal device detects the TC-RNTI-scrambled DCI in the public search space. The DCI is a public DCI, and the terminal devices in the cell can detect the DCI.

[0138] If the network device determines that the terminal device does not have the ability to switch carriers during the random access process, the uplink carrier used by the message 3 indicated by the TC-RNTI-scrambled DCI format 0_0 is the first uplink carrier; or, the bit reservation in the UL / SUL indication information field in the DCI is not effective, and the PUSCH scheduled by the DCI is always on the same uplink carrier as the previous transmission block of the same transmission block (TB). If the network device determines that the terminal device has the ability to switch carriers during the random access process, the uplink carrier used by the message 3 indicated by the TC-RNTI-scrambled DCI format 0_0 is the second uplink carrier, and the second uplink carrier is different from the first uplink carrier. After receiving the TC-RNTI-scrambled DCI format 0_0, the terminal device resends message 3 to the network device on the second uplink carrier according to the indication of the TC-RNTI-scrambled DCI format 0_0.

[0139] In one example, the network device can configure carrier indication information at different positions of the TC-RNTI-scrambled DCI format 0_0 according to the capability information of the terminal device to indicate the uplink carrier used by message 3. After receiving the TC-RNTI-scrambled DCI format 0_0, the terminal device determines the uplink carrier used by the message 3 when scheduling the retransmission of the message 3 by reading the corresponding bit positions of the TC-RNTI-scrambled DCI format 0_0.

[0140] If the network device determines that the terminal device does not have the carrier switching capability during the random access process, the first bit of the TC-RNTI-scrambled DCI format 0_0 may be set to the UL / SUL indication field as carrier indication information to indicate the uplink carrier used by message 3. If the terminal device is configured with SUL related information, and the number of bits of DCI format 1_0 before zero padding is more than the number of bits of DCI format 0_0, the first bit may be the last valid bit in the TC-RNTI-scrambled DCI format 0_0, where the valid bits do not include the zero-padding bits in the DCI.

[0141] If the network device determines that the terminal device has the carrier switching capability during the random access process, the second bit of the TC-RNTI-scrambled DCI format 0_0 can be set to the UL / SUL indication field as carrier indication information to indicate the uplink carrier used by message 3. If the terminal device is configured with SUL related information, and the number of bits of DCI format 1_0 before zero padding is at least two bits more than the number of bits of DCI format 0_0, the second bit can be the last m valid bits in the TC-RNTI-scrambled DCI format 0_0, where m is a positive integer and m>=2; or, the second bit can be the last nth to nmth valid bits of the TC-RNTI-scrambled DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers, wherein the valid bits do not include the zero-padding bits in the DCI. As an example, if N=3, the second bit position may include the last two valid bits in the DCI format 0_0 scrambled by TC-RNTI, or the second to last valid bit in the DCI format 0_0 scrambled by TC-RNTI, or the second to last and third to last valid bits in the DCI format 0_0 scrambled by TC-RNTI. If N=4, the second bit position may include the last three valid bits in the DCI format 0_0 scrambled by TC-RNTI, or the second to last and third to last valid bits in the DCI format 0_0 scrambled by TC-RNTI, or the second to last, third to fourth valid bits in the DCI format 0_0 scrambled by TC-RNTI.

[0142] Therefore, in Figure 4 or Figure 6 In the illustrated embodiment, the network device may carry carrier indication information in the random access response uplink authorization and / or TC-RNTI-scrambled DCI format 0_0 according to whether the terminal device has the capability of carrier switching during the random access process, so as to indicate whether the terminal device can send message 3 during the random access process on other uplink carriers different from the first uplink carrier, which helps to reduce the load of the first uplink carrier and solve the problem of heavy load on the first uplink carrier. And by supporting or allowing the terminal device to switch uplink carriers during the random access process, it helps to avoid the problem of excessive retransmission of message 3 and increased transmission delay when the first uplink carrier receives severe interference or poor channel quality. And by allowing message 3 to switch carriers during the random access process, more uplink resources can be provided for random access of the terminal device, which helps the terminal device to achieve fast access.

[0143] It should be noted that in Figure 4 and Figure 6In the flowchart shown, when the random access process involves the initial transmission of message 3 in response to RAR UL grant and the retransmission of DCI format 0_0 in response to TC-RNTI scrambling, in order to facilitate distinction, the uplink carrier used for the initial transmission or retransmission of message 3 may have different names. For example, if the above-mentioned first information is DCI format 0_0 scrambled by TC-RNTI, the uplink carrier used for the retransmission of message 3 in response to DCI format 0_0 scrambled by TC-RNTI may be called the second uplink carrier, and the uplink carrier used for the previous transmission of message 3 (including the initial transmission of message 3 in response to RAR UL grant) may be called the third uplink carrier, wherein, according to the capability information of the terminal device, the third uplink carrier may be the same as the first uplink carrier and / or the second uplink carrier, or may be different from the first uplink carrier and / or the second uplink carrier, and the details may be referred to the relevant description above, which will not be repeated here.

[0144] Based on the above embodiment, during the random access process of the terminal device, the network device can schedule the terminal device to send message 3 in the random access process on other uplink carriers that are different from the first uplink carrier that sends the random access preamble code according to the network situation and the capability information of the terminal device, which helps to provide more uplink resources for uplink transmission and reduce access delay, so as to facilitate rapid access. Among them, if the terminal device does not have the carrier switching capability during the random access process, once the terminal device selects an uplink carrier to send the random access preamble code, the uplink transmission in the entire random access process is completed on this uplink carrier. If the terminal device has the carrier switching capability during the random access process, the terminal device can switch the uplink carrier during the entire random access process, that is, different uplink transmissions in the random access process can be completed on different uplink carriers. At this time, the random access process of the terminal device can specifically include the following situations:

[0145] Scenario 1:

[0146] The first information is a random access response uplink authorization RAR UL grant, the terminal device sends a random access preamble on the first uplink carrier, and sends message 3 on the second uplink carrier indicated by the RAR UL grant, and the first uplink carrier is different from the second uplink carrier. The terminal device switches from the first uplink carrier to the second uplink carrier, and the terminal device does not send uplink transmissions on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

[0147] Scenario 2:

[0148] The first information is TC-RNTI-encrypted DCI format 0_0, the terminal device sends a random access preamble on the first uplink carrier, and sends message 3 on the second uplink carrier indicated by TC-RNTI-encrypted DCI format 0_0, and the first uplink carrier is different from the second uplink carrier. The terminal device switches from the first uplink carrier to the second uplink carrier, and the terminal device does not send uplink transmissions on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

[0149] Scenario 3:

[0150] The first information is DCI format 0_0 encrypted with TC-RNTI. The terminal device sends a random access preamble on the first uplink carrier, sends message 3 on the third uplink carrier indicated by the random access response uplink authorization RAR UL grant, and resends message 3 on the second uplink carrier indicated by DCI format 0_0 encrypted with TC-RNTI. The third uplink carrier is different from the second uplink carrier, and the first uplink carrier and the third uplink carrier may be the same. The terminal device switches from the third uplink carrier to the second uplink carrier, and the terminal device does not send uplink transmission on the third uplink carrier and the second uplink carrier within a predetermined time interval.

[0151] Scenario 4:

[0152] The first information is DCI format 0_0 encrypted with TC-RNTI. The terminal device sends a random access preamble on the first uplink carrier, sends the previous transmission of message 3 on the third uplink carrier, and resends message 3 on the second uplink carrier indicated by DCI format 0_0 encrypted with TC-RNTI. The third uplink carrier is different from the second uplink carrier, and the first uplink carrier and the third uplink carrier can be the same. Among them, the terminal device switches from the third uplink carrier to the second uplink carrier, and the terminal device does not send uplink transmissions on the third uplink carrier and the second uplink carrier within a predetermined time interval.

[0153] Scenario 5:

[0154] The first information is DCI format 0_0 encrypted with TC-RNTI, the terminal device sends a random access preamble on the first uplink carrier, sends message 3 on the third uplink carrier indicated by the random access response uplink authorization RAR UL grant, and resends message 3 on the second uplink carrier indicated by DCI format 0_0 encrypted with TC-RNTI, the first uplink carrier is different from the second uplink carrier and the second uplink carrier is different from the third uplink carrier. When the terminal device switches from the first uplink carrier to the third uplink carrier, the terminal device does not send uplink transmission on the first uplink carrier and the third uplink carrier within a predetermined time interval. When the terminal device switches from the third uplink carrier to the second uplink carrier, the terminal device does not send uplink transmission on the third uplink carrier and the second uplink carrier within a predetermined time interval.

[0155] Scenario 6:

[0156] The first information is the DCI format 0_0 encrypted with TC-RNTI, the terminal device sends a random access preamble on the first uplink carrier, sends the previous transmission of message 3 on the third uplink carrier, and resends message 3 on the second uplink carrier indicated by the DCI format 0_0 encrypted with TC-RNTI, the first uplink carrier is different from the second uplink carrier and the second uplink carrier is different from the third uplink carrier. When the terminal device switches from the first uplink carrier to the third uplink carrier, the terminal device does not send uplink transmissions on the first uplink carrier and the third uplink carrier within a predetermined time interval. When the terminal device switches from the third uplink carrier to the second uplink carrier, the terminal device does not send uplink transmissions on the third uplink carrier and the second uplink carrier within a predetermined time interval.

[0157] Therefore, in the above-mentioned various situations, during the random access process of the terminal device, the network device instructs the terminal device whether it can send message 3 in the random access process on other uplink carriers different from the first uplink carrier that sends the random access preamble code, based on whether the terminal device has the ability to switch carriers during the random access process, which helps to reduce the load of the first uplink carrier and helps to solve the problem of heavy load on the first uplink carrier. And by supporting or allowing the terminal device to switch uplink carriers during the random access process, it helps to avoid the problem of excessive retransmission of message 3 and increased transmission delay when the first uplink carrier receives severe interference or poor channel quality. In addition, by allowing message 3 to switch carriers during the random access process, more uplink resources can be provided for the random access of the terminal device, which helps the terminal device to achieve rapid access.

[0158] In the above embodiments, a single transmission situation, that is, a single uplink carrier carries a random access preamble or message 3 in a random access process, is mainly used as an example for explanation. In some embodiments, there may also be a concurrent situation, that is, two or more uplink carriers carry a random access preamble or message 3 in a random access process. Taking the situation where there are two concurrent uplink carriers as an example, the random access process of the terminal device may specifically include the following situations:

[0159] Case A: Random access response uplink grant (RAR UL grant) indicates the second uplink carrier used by message 3

[0160] A1, RAR UL grant indicates a second uplink carrier

[0161] The uplink carrier where the random access preamble code sent by the terminal device is located is two first uplink carriers, and the second uplink carrier indicated by the RAR UL grant is different from the two first uplink carriers; or, the second uplink carrier indicated by the RAR UL grant is different from one of the two first uplink carriers.

[0162] A2, RAR UL grant indicates two second uplink carriers

[0163] The uplink carrier where the random access preamble code sent by the terminal device is located is a first uplink carrier, and one of the two second uplink carriers indicated by the RAR ULgrant is the same as the first uplink carrier; or, the two second uplink carriers indicated by the RAR ULgrant are different from the first uplink carrier.

[0164] The uplink carrier where the random access preamble code sent by the terminal device is located is two first uplink carriers, and one of the two second uplink carriers indicated by the RAR ULgrant is the same as the two first uplink carriers; or, the two second uplink carriers indicated by the RAR ULgrant are different from the two first uplink carriers.

[0165] Case B: TC-RNTI scrambled DCI format 0_0 indicates the second uplink carrier used by message 3

[0166] B1. TC-RNTI scrambled DCI format 0_0 indicates a second uplink carrier

[0167] The RAR UL grant indicates two third uplink carriers, and the one second uplink carrier indicated by the DCI format 0_0 is different from the two third uplink carriers indicated by the RAR UL grant; or, the DCI format 0_0 indicates one second uplink carrier and the RAR UL grant indicates one different third uplink carrier.

[0168] B2. TC-RNTI scrambled DCI format 0_0 indicates two second uplink carriers

[0169] The RAR UL grant indicates a third uplink carrier, and one of the two second uplink carriers indicated by the DCI format 0_0 is the same as the third uplink carrier indicated by the RAR UL grant; or, the two second uplink carriers indicated by the DCI format 0_0 are different from the third uplink carrier indicated by the RAR UL grant.

[0170] The RAR UL grant indicates two third uplink carriers, and one of the two second uplink carriers indicated by the DCI format 0_0 is the same as the two third uplink carriers indicated by the RAR UL grant; or, the two second uplink carriers indicated by the DCI format 0_0 are different from the two third uplink carriers indicated by the RAR UL grant.

[0171] Case C: DCI indicates the second uplink carrier used in message 3, which is different from the first uplink carrier used to send the random access preamble

[0172] C1, DCI indicates a second uplink carrier

[0173] The uplink carrier on which the previous transmission of message 3 sent by the terminal device is located is two third uplink carriers, and the second uplink carrier indicated by the DCI is different from the two third uplink carriers; or, the second uplink carrier indicated by the DCI is the same as one of the two third uplink carriers.

[0174] C2, DCI indicates two second uplink carriers

[0175] The uplink carrier on which the previous transmission of message 3 sent by the terminal device is located is two third uplink carriers, and the second uplink carrier indicated by the DCI is different from the two third uplink carriers; or, the second uplink carrier indicated by the DCI is the same as one of the two third uplink carriers.

[0176] The uplink carrier on which the previous transmission of message 3 sent by the terminal device is located is a third uplink carrier, and the two second uplink carriers indicated by the DCI are different from the one third uplink carrier; or, the second uplink carrier indicated by the DCI is the same as one of the two third uplink carriers.

[0177] It should be understood that the above description only uses two concurrent uplink carriers as an example for illustration and is not limiting. The random access scheme of the embodiment of the present application can also be applied to more complex concurrent situations or situations where single transmission and concurrent transmission coexist, which will not be repeated here.

[0178] Therefore, in the above-mentioned various situations, during the random access process of the terminal device, the network device instructs the terminal device whether it can send message 3 in the random access process on at least one other uplink carrier different from the first uplink carrier that sends the random access preamble code, based on whether the terminal device has the ability to switch carriers during the random access process, which helps to reduce the load of the first uplink carrier and solve the problem of heavy load on the first uplink carrier. And by supporting or allowing the terminal device to switch uplink carriers during the random access process, it helps to avoid the problem of excessive retransmission of message 3 and increased transmission delay when the first uplink carrier receives severe interference or poor channel quality. In addition, by allowing message 3 to switch carriers during the random access process, more uplink resources can be provided for random access of the terminal device, which helps the terminal device to achieve rapid access.

[0179] The above mainly introduces the solution provided by the present application from the perspective of the interaction between the network device and the terminal device. It is understandable that in order to achieve the above functions, the network device and the terminal device include hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0180] like Figure 7 As shown, it is a possible exemplary block diagram of the information sending device involved in the present application, and the device 600 can exist in the form of software or hardware. The device 700 may include a communication unit 710. As an implementation, the communication unit 710 may include a receiving unit and a sending unit. The communication unit 710 is used to support the communication between the device 700 and other network entities. In some embodiments, the device 700 may also include a processing unit 720 and / or a storage unit 730, the processing unit 720 is used to control the action of the device 700, and the storage unit 730 is used to store the program code and data of the device 700.

[0181] Among them, the processing unit can be a processor or a controller, for example, it can be a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements a computing function, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on. The storage unit can be a memory. The communication unit is an interface circuit of the device for receiving signals from other devices. For example, when the device is implemented in the form of a chip, the communication unit is an interface circuit of the chip for receiving signals from other chips or devices, or an interface circuit of the chip for sending signals to other chips or devices.

[0182] The device 700 may be a terminal device in any of the above embodiments, and may also be a chip for a terminal device. For example, when the device 700 is a terminal device, the processing unit may be, for example, a processor, and the communication unit may be, for example, a transceiver. Optionally, the transceiver may include a radio frequency circuit, and the storage unit may be, for example, a memory. For example, when the device 700 is a chip for a terminal device, the processing unit may be, for example, a processor, and the communication unit may be, for example, an input / output interface, a pin or a circuit, etc. The processing unit may execute computer-executable instructions stored in the storage unit. Optionally, the storage unit may be a storage unit in the chip, such as a register, a cache, etc. The storage unit may also be a storage unit in the terminal device located outside the chip, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0183] In one embodiment, the communication unit 710 is used to send a random access preamble code on a first uplink carrier; the communication unit is also used to receive first information, the first information includes carrier indication information, and the carrier indication information is used to indicate a second uplink carrier used by message 3 in the random access process, and the second uplink carrier is different from the first uplink carrier; the communication unit is also used to send message 3 in the random access process on the second uplink carrier.

[0184] In a possible implementation method, the first information is downlink control information DCI, wherein the format of the DCI is 0_0.

[0185] In a possible implementation method, the first information is a random access response uplink grant.

[0186] In a possible implementation method, the communication unit is further used to: before receiving the first information, send a previous transmission of the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0187] In a possible implementation method, the communication unit is also used to: before receiving the first information, receive a random access response uplink authorization, and the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0188] In a possible implementation method, the first information is downlink control information DCI, and the carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or the carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

[0189] In a possible implementation method, the communication unit is further used to: indicate to the network device that the uplink carrier supported by the terminal device to carry the message 3 is different from the first uplink carrier.

[0190] In a possible implementation method, the serving cells where the first uplink carrier and the second uplink carrier are located have the same cell identifier; or the first uplink carrier and the second uplink carrier are configured by SIB1.

[0191] In a possible implementation method, the serving cells where the first uplink carrier, the second uplink carrier, and the third uplink carrier are located have the same cell identifier; or the first uplink carrier, the second uplink carrier, and the third uplink carrier are configured by SIB1.

[0192] In an optional implementation, the terminal device does not send uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

[0193] It can be understood that the specific implementation process and corresponding beneficial effects of the device when used for the above-mentioned information sending method can be referred to the relevant description in the aforementioned method embodiment, and will not be repeated here.

[0194] like Figure 8 As shown, it is a possible exemplary block diagram of the information receiving device involved in the present application, and the device 800 may exist in the form of software or hardware. The device 800 may include a communication unit 810. As an implementation, the communication unit 810 may include a receiving unit and a sending unit. The communication unit 810 is used to support the communication between the device 800 and other network entities. In some embodiments, the device 800 may also include a processing unit 820 and / or a storage unit 830, the processing unit is used to control the action of the device 800, and the storage unit is used to store the program code and data of the device 800.

[0195] Among them, the processing unit can be a processor or a controller, for example, it can be a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements a computing function, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on. The storage unit can be a memory. The communication unit is an interface circuit of the device for receiving signals from other devices. For example, when the device is implemented in the form of a chip, the communication unit is an interface circuit of the chip for receiving signals from other chips or devices, or an interface circuit of the chip for sending signals to other chips or devices.

[0196] The device 800 may be a network device in any of the above embodiments, and may also be a chip for a network device. For example, when the device 800 is a network device, the processing unit may be, for example, a processor, and the communication unit may be, for example, a transceiver. Optionally, the transceiver may include a radio frequency circuit, and the storage unit may be, for example, a memory. For example, when the device 800 is a chip for a network device, the processing unit may be, for example, a processor, and the communication unit may be, for example, an input / output interface, a pin or a circuit, etc. The processing unit may execute computer-executable instructions stored in the storage unit, and optionally, the storage unit may be a storage unit in the chip, such as a register, a cache, etc. The storage unit may also be a storage unit located outside the chip in the network device, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0197] In one embodiment, the communication unit 810 is used to receive a random access preamble code sent on a first uplink carrier; the communication unit 810 is also used to send first information, wherein the first information includes carrier indication information, which is used to indicate a second uplink carrier used by message 3 in the random access process, and the second uplink carrier is different from the first uplink carrier; the communication unit 810 is also used to receive message 3 in the random access process sent on the second uplink carrier.

[0198] In a possible implementation method, the first information is downlink control information DCI, wherein the format of the DCI is 0_0.

[0199] In a possible implementation method, the first information is a random access response uplink grant.

[0200] In a possible implementation method, the communication unit 810 is further configured to: before sending the first information, receive the message 3 sent on a third uplink carrier, where the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0201] In a possible implementation method, the communication unit 810 is also used to: before sending the first information, send a random access response uplink authorization to the terminal device, and the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, wherein the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier.

[0202] In a possible implementation method, the first information is downlink control information DCI, and the carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or the carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

[0203] In a possible implementation method, the communication unit 810 is further used to: obtain an indication from a terminal device: the second uplink carrier supported by the terminal device for carrying the message 3 is different from the first uplink carrier.

[0204] In a possible implementation method, the serving cells where the first uplink carrier and the second uplink carrier are located have the same cell identifier; or the first uplink carrier and the second uplink carrier are configured by SIB1.

[0205] In a possible implementation method, the serving cells where the first uplink carrier, the second uplink carrier, and the third uplink carrier are located have the same cell identifier; or the first uplink carrier, the second uplink carrier, and the third uplink carrier are configured by SIB1.

[0206] In an optional implementation, the terminal device does not send uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

[0207] It can be understood that the specific implementation process and corresponding beneficial effects of the device when used for the above-mentioned information receiving method can be referred to the relevant description in the aforementioned method embodiment, and will not be repeated here.

[0208] like Fig. 9 As shown, it is a schematic diagram of a device provided by the present application, and the device can be a terminal device or a network device in the above-mentioned embodiment, or it can be an information sending device or an information receiving device in the above-mentioned embodiment. The device 900 includes: a processor 902, a communication interface 903, and a memory 901. Optionally, the device 900 may also include a communication line 904. Among them, the communication interface 903, the processor 902 and the memory 901 can be interconnected through the communication line 904; the communication line 904 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The communication line 904 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig. 9Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0209] The processor 902 may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the present application.

[0210] The communication interface 903 uses any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), wired access networks, etc.

[0211] The memory 901 may be a ROM or other types of static storage devices that can store static information and instructions, a RAM or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor via a communication line 904. The memory may also be integrated with the processor.

[0212] The memory 901 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 902. The processor 902 is used to execute the computer-executable instructions stored in the memory 901, thereby implementing the information sending method and / or information receiving method provided in the above embodiments of the present application.

[0213] Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code, which is not specifically limited in the embodiments of the present application.

[0214] Those of ordinary skill in the art will appreciate that the various digital numbers such as the first and second involved in this application are only for the convenience of description, and are not used to limit the scope of the embodiments of the present application, and also represent the order of precedence. "And / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one" refers to one or more. At least two refers to two or more. "At least one", "any one" or similar expressions refer to any combination of these items, including any combination of single items (individuals) or plural items (individuals). For example, at least one item (individuals, species) of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. "Multiple" refers to two or more, and other quantifiers are similar. In addition, when the singular forms “a,” “an,” and “the” appear, they do not mean “one or only one,” but rather “one or more than one,” unless the context clearly dictates otherwise. For example, “a device” means one or more of such devices.

[0215] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

[0216] The various illustrative logic units and circuits described in the embodiments of the present application can be implemented or operated by a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, a discrete hardware component, or the design of any combination of the above functions. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any traditional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration to implement.

[0217] The steps of the method or algorithm described in the embodiments of the present application can be directly embedded in the software unit executed by the hardware, the processor, or a combination of the two. The software unit can be stored in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM or other storage media of any form in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Alternatively, the storage medium can also be integrated into the processor. The processor and the storage medium can be arranged in an ASIC.

[0218] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0219] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for sending information, characterized in that: The method comprises: The terminal device sends a random access preamble code on the first uplink carrier; The terminal device sends a previous transmission of message 3 in the random access process on a third uplink carrier, or the terminal device receives a random access response uplink authorization, wherein the random access response uplink authorization is used to instruct the terminal device to send the message 3 on the third uplink carrier, and the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier; the terminal device receives first information, and the first information includes carrier indication information, and the carrier indication information is used to indicate the second uplink carrier used by message 3 in the random access process, and the second uplink carrier is different from the first uplink carrier; The terminal device sends message 3 in the random access process on the second uplink carrier.

2. The method according to claim 1, characterized in that The first information is downlink control information DCI, wherein the format of the DCI is 0_0.

3. The method according to claim 1, characterized in that: The first information is a random access response uplink grant.

4. The method according to claim 1 or 2, characterized in that: When the first information is downlink control information DCI, The carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or The carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

5. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: The terminal device indicates to the network device that the uplink carrier supported by the terminal device for carrying the message 3 is different from the first uplink carrier.

6. The method according to any one of claims 1 to 3, characterized in that The cell identifiers of serving cells where the first uplink carrier and the second uplink carrier are located are the same; or The first uplink carrier and the second uplink carrier are configured by SIB1.

7. The method according to claim 1, characterized in that The terminal device does not send uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

8. A method for receiving information, characterized in that: The method comprises: The network device receives a random access preamble code sent on a first uplink carrier; The network device receives a message 3 in a random access process sent on a third uplink carrier, or the network device sends a random access response uplink authorization to the terminal device, wherein the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, and the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier; The network device sends first information, where the first information includes carrier indication information, which is used to indicate the second uplink carrier used by message 3 in the random access process, where the second uplink carrier is different from the first uplink carrier; The network device receives message 3 in the random access procedure sent on the second uplink carrier.

9. The method according to claim 8, characterized in that The first information is downlink control information DCI, wherein the format of the DCI is 0_0.

10. The method according to claim 8, characterized in that The first information is a random access response uplink grant.

11. The method according to claim 8 or 9, characterized in that: When the first information is downlink control information DCI, The carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or The carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

12. The method according to any one of claims 8 to 10, characterized in that: The method further comprises: The network device obtains an indication from the terminal device: the second uplink carrier supported by the terminal device for carrying the message 3 is different from the first uplink carrier.

13. The method according to any one of claims 8 to 10, characterized in that: The cell identifiers of serving cells where the first uplink carrier and the second uplink carrier are located are the same; or The first uplink carrier and the second uplink carrier are configured by SIB1.

14. The method according to claim 8, characterized in that The network device does not receive uplink transmission of the terminal device on the first uplink carrier and the second uplink carrier within a predetermined time interval before receiving message 3.

15. An information sending device, characterized in that: including a communication unit; The communication unit is configured to send a random access preamble on a first uplink carrier; send a previous transmission of a message 3 in a random access process on a third uplink carrier, or receive a random access response uplink grant, wherein the random access response uplink grant is used to instruct the terminal device to send the message 3 on a third uplink carrier, and the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier; The communication unit is further used to receive first information, where the first information includes carrier indication information, where the carrier indication information is used to indicate the second uplink carrier used by message 3 in the random access process, where the second uplink carrier is different from the first uplink carrier; The communication unit is further used to send message 3 in the random access process on the second uplink carrier.

16. The device according to claim 15, characterized in that The first information is downlink control information DCI, wherein the format of the DCI is 0_0.

17. The device according to claim 15, characterized in that The first information is a random access response uplink grant.

18. The device according to claim 15 or 16, characterized in that When the first information is downlink control information DCI, The carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or The carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

19. The device according to any one of claims 15 to 17, characterized in that The communication unit is further used to indicate to the network device that the uplink carrier supported by the terminal device for carrying the message 3 is different from the first uplink carrier.

20. The device according to any one of claims 15 to 17, characterized in that The cell identifiers of serving cells where the first uplink carrier and the second uplink carrier are located are the same; or The first uplink carrier and the second uplink carrier are configured by SIB1.

21. The device according to claim 15, characterized in that The communication unit does not send uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before sending message 3.

22. An information receiving device, characterized in that: including a communication unit; The communication unit is configured to receive a random access preamble sent on a first uplink carrier; receive a message 3 in a random access process sent on a third uplink carrier, or send a random access response uplink authorization to a terminal device, wherein the random access response uplink authorization is used to instruct the terminal device to send the message 3 on a third uplink carrier, and the third uplink carrier is different from the first uplink carrier and / or the second uplink carrier; The communication unit is further used to send first information, where the first information includes carrier indication information, which is used to indicate the second uplink carrier used by message 3 in the random access process, where the second uplink carrier is different from the first uplink carrier; The communication unit is further configured to receive message 3 in the random access process sent on the second uplink carrier.

23. The device according to claim 22, characterized in that The first information is downlink control information DCI, wherein the format of the DCI is 0_0.

24. The device according to claim 22, characterized in that The first information is a random access response uplink grant.

25. The device according to claim 22 or 23, characterized in that When the first information is downlink control information DCI, The carrier indication information is the last m valid bits in DCI format 0_0, where m is a positive integer and m>=2; or The carrier indication information is the last nth to nmth valid bits in DCI format 0_0, where n>=2, m>=1, n>m, and n and m are positive integers; the valid bits do not include zero-filled bits in DCI.

26. The device according to any one of claims 22 to 24, characterized in that The communication unit is further used to: obtain an indication from a terminal device: the second uplink carrier supported by the terminal device for carrying the message 3 is different from the first uplink carrier.

27. The device according to any one of claims 22 to 24, characterized in that The cell identifiers of serving cells where the first uplink carrier and the second uplink carrier are located are the same; or The first uplink carrier and the second uplink carrier are configured by SIB1.

28. The device according to claim 22, characterized in that The communication unit does not receive uplink transmission on the first uplink carrier and the second uplink carrier within a predetermined time interval before receiving message 3.

29. An information sending device, characterized in that: include: A processor and an interface circuit, wherein the processor is used to communicate with a network device through the interface circuit and execute the method according to any one of claims 1 to 7.

30. An information receiving device, characterized in that: include: A processor and an interface circuit, wherein the processor is used to communicate with a terminal device through the interface circuit and execute the method according to any one of claims 8 to 14.

31. A computer-readable storage medium, characterized in that: The method comprises a computer program, which, when executed on a computer, causes the computer to execute the method according to any one of claims 1 to 7 or 8 to 14.

32. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is run on a computer, the computer is caused to execute the method according to any one of claims 1 to 7 or 8 to 14.

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