Communication method and device

Abstract

The invention relates to the technical field of communication, and discloses a communication method and device, which are used for solving the problem of how to determine uplink transmission power by terminal equipment to avoid interference on transmission of other uplink services if uplink services of the terminal equipment are forwarded to network equipment through a relay node when an uplink relay node is introduced to enhance uplink coverage. The method comprises the following steps: the terminal equipment receives first information from first network equipment, wherein the first information comprises a quality threshold value and path loss bias; obtaining downlink quality and downlink path loss of the first path; when it is determined that the downlink quality is lower than the quality threshold value, the uplink transmitting power of a second path is determined according to the downlink path loss and the path loss offset, and the second path is a communication path between the terminal device and a second network device.

Description

[0001] This application is a divisional application. The application number of the original application is 202080092571.6, and the original application date is January 17, 2020. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to communication methods and devices. Background Art

[0003] When deploying new radio (NR) cells, considering that the transmission power of network equipment is higher than that of terminal equipment, there is a scenario where the uplink (UL) coverage of the cell is smaller than the downlink (DL) coverage of the cell. Therefore, in the R17 standard stage, the introduction of nodes with amplification function was discussed to achieve NR coverage enhancement. One possible way is to deploy uplink relay nodes, and the network equipment and uplink relay nodes jointly achieve uplink coverage, so that the uplink coverage and downlink coverage of NR are balanced. Figure 1 As shown, the uplink relay node only supports the transmission of uplink services (data, signals, etc.) of terminal devices, such as receiving uplink services of terminal devices and forwarding them to network devices. In this deployment architecture, uplink coverage is provided by network devices and uplink relay nodes. The uplink frequency of network devices and uplink relay nodes is the same. A cell has a downlink frequency and an uplink frequency. This can avoid setting additional uplink frequencies to achieve a balance between uplink coverage and downlink coverage, such as setting additional supplementary uplink (SUL) frequencies. The network devices and terminal devices need to additionally support SUL, which can effectively reduce the deployment cost of the network.

[0004] However, when accessing a cell where an uplink relay node is deployed, the uplink and downlink of the terminal device can be separated. Figure 1 For example, when the terminal device is in the outer area of ​​the downlink coverage area of ​​the network device, the uplink service of the terminal device is forwarded to the network device through the uplink relay node, and the downlink service of the terminal device is still sent to the terminal device by the network device. If the terminal device still directly performs uplink scheduling based on the downlink quality, problems such as excessive uplink transmission power of the terminal device will arise, which will interfere with the transmission of other uplink services. Summary of the invention

[0005] The present application provides a communication method and apparatus for solving the problem of how the terminal device determines the uplink transmission power to avoid interference with other uplink service transmissions when an uplink relay node is introduced to enhance uplink coverage and if the uplink service of the terminal device is forwarded to the network device through the relay node.

[0006] In a first aspect, the present application provides a communication method, the method comprising: receiving first information from a first network device, the first information comprising a quality threshold value and a path loss bias; obtaining downlink quality and a downlink path loss of a first path; when it is determined that the downlink quality is lower than the quality threshold value, determining an uplink transmission power of a second path according to the downlink path loss and the path loss bias, the second path being a communication path between a terminal device and a second network device.

[0007] In the present application, the first network device can support uplink service transmission and downlink service transmission of the terminal device, and can support processing of uplink services and downlink services of the terminal device. As an example, the first network device can be a base station or other device that communicates with the terminal device through one or more cells in the NR system; the second network device only supports uplink service transmission of the terminal device, for example, only supports receiving uplink services of the terminal device, and forwarding the received uplink services to the first network device. As an example, the second network device can be an uplink relay node.

[0008] The communication method described in the present application can be implemented by a terminal device, or by a processing chip, circuit and other components in the terminal device. Using the above method, when the obtained downlink quality is lower than the quality threshold, the terminal device determines the uplink coverage area located in the second network device. The terminal device can accurately determine whether it is located in the uplink coverage area of ​​the first network device or the uplink coverage area of ​​the second network device according to the quality threshold value, and can correct the path loss of the communication path between the terminal device and the first network device according to the path loss bias, and obtain the path loss of the communication path between the terminal device and the second network device, and then accurately determine the uplink transmission power of the communication path between the terminal device and the second network device, avoiding problems such as excessive uplink transmission power of the terminal device, thereby avoiding interference with other uplink service transmissions.

[0009] In one possible design, if the first information also includes a second receiving target power corresponding to the second network device, determining the uplink transmit power of the second path based on the downlink path loss and the path loss bias includes: determining the uplink transmit power of the second path based on the downlink path loss, the path loss bias and the second receiving target power.

[0010] In the above design, the first network device can also indicate a second receiving target power corresponding to the second network device, which is beneficial for the terminal device to accurately determine the uplink transmission power of the communication path between the terminal device and the second network device, thereby avoiding problems such as excessive uplink transmission power of the terminal device.

[0011] In one possible design, a target power climbing step size is determined based on the number of random access retransmissions and a second power climbing step size corresponding to the second network device; and the uplink transmit power is adjusted based on the target power climbing step size.

[0012] In the above design, when the terminal device is located in the uplink coverage area of ​​the second network device, after the random access fails, the terminal device adjusts the uplink transmission power of the communication path between the terminal device and the second network device based on the number of random access retransmissions and the second power climbing step corresponding to the second network device. This is beneficial to accurately control the uplink transmission power of the communication path between the terminal device and the second network device, and avoid problems such as excessive uplink transmission power of the terminal device.

[0013] In one possible design, a timing advance TA corresponding to the second network device is determined.

[0014] In the above design, there is a difference in the distance between the first network device, the second network device and the terminal device, which will also cause a difference between the TA of the terminal device corresponding to the first network device and the TA corresponding to the second network device. The terminal device can correct the TA corresponding to the first network device according to the timing advance bias to obtain the TA corresponding to the second network device, thereby avoiding interference between the uplink service transmission of different terminal devices and affecting the network device's reception of the terminal device's uplink service.

[0015] In a second aspect, the present application provides a communication method, the method comprising: receiving second information from a first network device, the second information comprising a first parameter and a second parameter for a first cell, wherein the first parameter is used for a first terminal device to perform cell selection or cell reselection, and the second parameter is used for a second terminal device to perform cell selection or cell reselection, the first terminal device is a terminal device that supports uplink service transmission through the first network device and the second network device, and the second terminal device is a terminal device that only supports uplink service transmission through the first network device; determining the parameters for cell selection or cell reselection based on the second information and whether the terminal device supports uplink service transmission through the second network device.

[0016] The communication method described in the present application can be implemented by a terminal device, or by a processing chip, circuit or other components in the terminal device. Using the above method, when the cell is a cell where a second network device is deployed, the first network device sends a first parameter and a second parameter for the first cell to the terminal device, which are used to support the terminal device that performs uplink service transmission through the first network device and the second network device to perform cell selection or cell reselection, and the terminal device that only supports uplink service transmission through the first network device to perform cell selection or cell reselection. Avoid sending only the second parameter corresponding to the terminal device that only supports uplink service transmission through the first network device for cell selection or cell reselection, which causes the problem of too early or too late reselection of the cell.

[0017] In one possible design, the first parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0018] In the above design, an indirect indication method can be used to indicate the minimum reception level required by the first cell for uplink service transmission to the first terminal device and the minimum reception level required by the first cell for uplink service transmission to the second terminal device.

[0019] In one possible design, the first parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0020] In the above design, direct indication may be used to indicate the minimum reception level required by the first cell for uplink service transmission to the first terminal device and the minimum reception level required by the first cell for uplink service transmission to the second terminal device.

[0021] In one possible design, the first cell is a service cell or a neighboring cell of the terminal device.

[0022] In the above design, when the service cell or the neighboring cell is a cell where a second network device is deployed, the first network device can send a second indication message to the terminal device, which is beneficial for the terminal device to select and reselect the cell based on whether it supports the ability to transmit uplink services through the first network device and the second network device, thereby avoiding the occurrence of too early or too late reselection of the cell.

[0023] In a third aspect, the present application provides a communication method, the method comprising: a first network device sends first information to a terminal device, the first information comprising a quality threshold value and a path loss bias.

[0024] The communication method described in the present application can be implemented by the first network device, and can also be implemented by components such as processing chips and circuits in the first network device.

[0025] In one possible design, the first information also includes a second receiving target power corresponding to the second network device.

[0026] In a fourth aspect, the present application provides a communication method, the method comprising: a first network device sends second information to a terminal device, the second information comprising a first parameter and a second parameter for a first cell, wherein the first parameter is used by the first terminal device to perform cell selection or cell reselection, and the second parameter is used by the second terminal device to perform cell selection or cell reselection, the first terminal device is a terminal device that supports uplink service transmission through the first network device and the second network device, and the second terminal device is a terminal device that only supports uplink service transmission through the first network device.

[0027] The communication method described in the present application can be implemented by the first network device, and can also be implemented by components such as processing chips and circuits in the first network device.

[0028] In one possible design, the first parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0029] In one possible design, the first parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0030] In one possible design, the first cell is a service cell or a neighboring cell of the terminal device.

[0031] In a fifth aspect, an embodiment of the present application provides a communication device, which has the function of implementing the first aspect or any possible design method of the first aspect, or implementing the second aspect or any possible design method of the second aspect, and the function can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units (modules) corresponding to the above functions, such as a transceiver unit and a processing unit.

[0032] In one possible design, the device may be a chip or an integrated circuit.

[0033] In one possible design, the device includes a memory and a processor, the memory is used to store a program executed by the processor, and when the program is executed by the processor, the device can execute the method described in the first aspect or any possible design of the first aspect, or execute the method or function described in the second aspect or any possible design of the second aspect.

[0034] In one possible design, the apparatus may be a terminal device.

[0035] In a sixth aspect, an embodiment of the present application provides a communication device, which has the function of implementing the third aspect or any possible design method of the third aspect, or implementing the fourth aspect or any possible design method of the fourth aspect, and the function can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units (modules) corresponding to the above functions, such as a transceiver unit and a processing unit.

[0036] In one possible design, the device may be a chip or an integrated circuit.

[0037] In one possible design, the device includes a memory and a processor, the memory is used to store a program executed by the processor, and when the program is executed by the processor, the device can execute the method described in the third aspect or any possible design of the third aspect, or execute the functions of the method described in the fourth aspect or any possible design of the fourth aspect.

[0038] In one possible design, the apparatus may be a network device.

[0039] In the seventh aspect, an embodiment of the present application provides a communication system, which may include a terminal device and a network device, wherein the terminal device can be used to execute the method described in the first aspect or any possible design of the first aspect, or execute the method described in the second aspect or any possible design of the second aspect, and the network device can be used to execute the method described in the third aspect or any possible design of the third aspect, or execute the method described in the fourth aspect or any possible design of the fourth aspect.

[0040] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed, it can implement the method described in the first aspect or any possible design of the first aspect, or implement the method described in the second aspect or any possible design of the second aspect, or implement the method described in the third aspect or any possible design of the third aspect, or implement the method described in the fourth aspect or any possible design of the fourth aspect.

[0041] In the ninth aspect, an embodiment of the present application also provides a computer program product, including a computer program or instructions. When the computer program or instructions are executed, it can implement the method described in the first aspect or any possible design of the first aspect, or implement the method described in the second aspect or any possible design of the second aspect, or implement the method described in the third aspect or any possible design of the third aspect, or implement the method described in the fourth aspect or any possible design of the fourth aspect.

[0042] The technical effects that can be achieved in the third to ninth aspects mentioned above can refer to the technical effects that can be achieved in the first or second aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of uplink relay node enhanced uplink coverage provided by this application;

[0044] Figure 2 A schematic diagram of a communication architecture provided for an embodiment of the present application;

[0045] Figure 3 A schematic diagram of path loss provided in an embodiment of the present application;

[0046] Figure 4A and Figure 4B This is a schematic diagram of uplink time adjustment in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the communication process provided in an embodiment of the present application;

[0048] Figure 6 Another communication process schematic diagram provided in an embodiment of the present application;

[0049] Figure 7 A schematic diagram of uplink and downlink coverage provided in an embodiment of the present application;

[0050] Figure 8 A schematic diagram of a cell selection / cell reselection process provided in an embodiment of the present application;

[0051] Fig. 9A schematic diagram of another cell selection / cell reselection process provided in an embodiment of the present application;

[0052] Fig.10 A schematic block diagram of a communication device provided in an embodiment of the present application;

[0053] Fig.11 A schematic block diagram of a terminal device provided in an embodiment of the present application;

[0054] Fig.12 Another schematic block diagram of a communication device provided in an embodiment of the present application;

[0055] Fig.13 A schematic block diagram of a network device provided in an embodiment of the present application;

[0056] Fig.14 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0057] Fig.15 A schematic diagram of the structure of a network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solution of the embodiment of the present application can be applied to various communication systems, for example, it can be applied to communication systems such as the fifth generation (5th generation, 5G) system, and can also be applied to wireless fidelity (wireless fidelity, WiFi), worldwide interoperability for microwave access (worldwide interoperability for microwave access, WiMAX), or future communication systems, such as the future sixth generation (6th generation, 6G) system, etc. Among them, 5G can also be called new radio (new radio, NR).

[0059] For example, the communication system architecture used in the embodiments of the present application can be as follows: Figure 2 As shown, it includes a first network device, a second network device and a terminal device. It should be noted that the embodiment of the present application does not limit Figure 2 The number of the first network device, the second network device, and the terminal device in the communication system shown in , wherein the first network device can support uplink service transmission and downlink service transmission of the terminal device, and can support the processing of uplink service and downlink service of the terminal device, and the second network device only supports uplink service transmission of the terminal device, for example, only supports receiving uplink service of the terminal device, and forwards the received uplink service to the first network device. The terminal device can directly transmit uplink service and / or downlink service with the first network device, and can also transmit uplink service with the first network device through the second network device.

[0060] Before introducing the embodiments of the present application, some terms in the embodiments of the present application are first explained to facilitate understanding by those skilled in the art.

[0061] 1) Terminal equipment, including equipment that provides voice and / or data connectivity to users, such as a handheld device with wireless connection function, or a processing device connected to a wireless modem. The terminal equipment can communicate with the core network via a radio access network (RAN) and exchange voice and / or data with the RAN. The terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, V2X terminal equipment, machine-to-machine / machine-type communications (M2M / MTC) terminal equipment, Internet of Things (IoT) terminal equipment, subscriber unit, subscriber station, mobile station, remote station, access point (AP), remote terminal, access terminal, user terminal, user agent, or user equipment, etc. For example, it may include mobile phones (or "cellular" phones), computers with mobile terminal devices, portable, pocket-sized, handheld, and computer-built-in mobile devices, etc. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA), and other devices. It also includes limited devices, such as devices with low power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. For example, it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), laser scanners, etc.

[0062] As an example but not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices or smart wearable devices, etc., which are a general term for the application of wearable technology to intelligently design and develop wearable devices for daily wear, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-size, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, etc., as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0063] The various terminal devices introduced above, if located on a vehicle (eg, placed in or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also called on-board units (OBU).

[0064] In the embodiment of the present application, the terminal device may also include a relay. Alternatively, it can be understood that anything that can communicate data with the base station can be regarded as a terminal device.

[0065] In the embodiment of the present application, the device for realizing the function of the terminal device may be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system, which may be installed in the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the terminal device as an example in which the device for realizing the function of the terminal is a terminal device.

[0066] 2) The first network device may refer to a device in the access network that communicates with the wireless terminal device through one or more cells at the air interface. The first network device may be a node in the wireless access network, which may also be called a base station, or a radio access network (RAN) node (or device). At present, some examples of the first network device are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), base band unit (BBU), or wireless fidelity (Wifi) access point (AP), etc. In addition, in a network structure, the first network device may include a centralized unit (CU) node and / or a distributed unit (DU) node. CU implements some functions of gNB, and DU implements some functions of gNB. For example, CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer.

[0067] In the embodiment of the present application, the device for implementing the function of the first network device may be the first network device, or may be a device capable of supporting the first network device to implement the function, such as a chip system, and the device may be installed in the first network device. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for implementing the function of the first network device as the first network device as an example.

[0068] 3) The second network device, also called an uplink relay device (UL only), may be a relay device that only supports uplink service transmission of terminal devices, such as a relay device that only supports receiving uplink services sent by terminal devices and forwards the uplink services sent by terminal devices to the first network device.

[0069] In the embodiment of the present application, the device for implementing the function of the second network device may be the second network device, or may be a device capable of supporting the second network device to implement the function, such as a chip system, which may be installed in the second network device. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for implementing the function of the second network device as the second network device as an example.

[0070] 4) Path loss refers to the average signal power loss between the transmitter and the receiver caused by the transmission distance and the transmission environment. It is a quantity that is strongly related to the transmission distance, transmission environment and carrier frequency. Figure 3 As shown, in a communication system, path loss can be simply understood as the power loss when a signal transmitted by a network device is transmitted to the location of a terminal device, for example: path loss = the difference between the transmission power of a network device or a cell and the reception power measured by the terminal device.

[0071] 3) Uplink time adjustment (determination of timing advance (TA)).

[0072] like Figure 4A As shown, due to the delay in signal propagation between the network device and the terminal device, the interval from the start time of the network device sending the downlink signal to the start time of the terminal device 1 receiving the downlink signal is ΔT 1 =d 1 / c, where d 1 is the distance between the network device and the terminal device 1, and c is the signal propagation speed. For wireless communication, c is the speed of light. Similarly, ΔT 2 =d 2 / c, where d 2 is the distance between the network device and terminal device 2. If terminal device 1 does not perform uplink timing adjustment, it sends an uplink signal to the network device with the start time of receiving the downlink signal as a reference. The interval from the start time of sending the uplink signal by terminal device 1 to the start time of receiving the uplink signal by the network device is also ΔT 1 Therefore, for terminal device 1, there is a time delay of 2ΔT from the start time of sending the downlink signal to the start time of receiving the uplink signal. 1 Similarly, for terminal device 2, there is a time difference of 2ΔT from the start time of sending the downlink signal to the start time of receiving the uplink signal.2 Due to the different distances between each terminal device and the network device, the time for the uplink signal to reach the network device is different, resulting in timing deviation between the terminal devices. When the timing deviation is greater than the cyclic prefix (CP) of the orthogonal frequency division multiplexing (OFDM) symbol, the terminal devices will interfere with each other.

[0073] In order to solve the interference problem between terminal devices, the terminal devices need to make timing adjustments, also known as timing advance, or TA. Figure 4B As shown, the terminal device 1 advances the start time of sending the uplink signal by 2ΔT 1 , terminal device 2 advances the start time of sending the uplink signal by 2ΔT 2 , the network device will receive the uplink signals of terminal device 1 and terminal device 2 at the same time, thereby solving the problem of mutual interference between terminal devices.

[0074] 5) Uplink transmission power determination, which can also be called uplink power control, is to enable the network device to receive uplink services with appropriate receiving power. The uplink service can be the service transmitted by the terminal device through the uplink physical channel. For example, the appropriate receiving power means, on the one hand, the receiving power required for the uplink service to be correctly decoded by the network device, and on the other hand, it means that the uplink transmission power of the uplink service cannot be unnecessarily high, so as not to interfere with other uplink service transmissions. In order to enable the network device to receive the uplink service sent by the terminal device through the uplink physical channel with appropriate receiving power, in the uplink transmission power determination, the uplink transmission power when the terminal device sends the uplink service is mainly controlled. Optionally, for a certain channel, the uplink transmission power required for the channel is related to the attenuation experienced by the channel (such as path loss), the interference and noise level at the receiving end, etc., so accurate path loss plays a vital role in determining the uplink transmission power.

[0075] Reference Figure 1 and Figure 2As shown, with the deployment of a second network device that only supports receiving uplink services of terminal devices (such as an uplink relay node), the uplink coverage is changed from being provided by a first network device that only supports uplink service transmission and downlink service transmission of terminal devices (such as a base station that communicates with terminal devices through one or more cells in an NR system, etc.) to being provided jointly by the first network device and the second network device. How the terminal device identifies whether it is in the uplink coverage area of ​​the first network device or the uplink coverage area of ​​the second network device, and when it is in the uplink coverage area of ​​the second network device, how to determine the uplink transmission power to avoid interference with other uplink service transmissions has become a problem that needs to be solved urgently. The embodiments of the present application aim to solve the above problems.

[0076] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In addition, it should be understood that in the embodiments of the present application, at least one can also be described as one or more, and a plurality can be two, three, four or more, and the present application does not make any limitation thereto.

[0077] In the embodiments of the present application, " / " can indicate that the objects associated before and after are in an "or" relationship, for example, A / B can indicate A or B; "and / or" can be used to describe that there are three relationships between the associated objects, for example, A and / or B can indicate: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In order to facilitate the description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first" and "second" can be used to distinguish between technical features with the same or similar functions. The words "first" and "second" do not limit the quantity and execution order, and the words "first" and "second" do not necessarily limit them to be different. In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations, and the embodiments or designs described as "exemplary" or "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. The use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way for easy understanding.

[0078] It is understandable that in the embodiment of the present application, the terminal device and / or the network device can perform some or all of the steps in the embodiment of the present application, and these steps or operations are only examples. The embodiment of the present application can also perform other operations or variations of various operations. In addition, each step can be performed in a different order presented in the embodiment of the present application, and it is possible not to perform all the operations in the embodiment of the present application.

[0079] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0080] [Example 1]

[0081] Figure 5 A communication process diagram provided in an embodiment of the present application includes:

[0082] S501: A terminal device receives first information from a first network device, where the first information includes a quality threshold value and a path loss bias.

[0083] In a cell where a second network device is deployed, there are two communication paths between the terminal device and the network device, namely, the communication path between the terminal device and the first network device, and the communication path between the terminal device and the second network device. In the embodiment of the present application, the communication path between the terminal device and the first network device is referred to as the first path, and the communication path between the terminal device and the second network device is referred to as the second path, where "the first path" and "the second path" are also used in the subsequent description in the embodiment of the present application and will not be described separately. The first network device can transmit downlink services with the terminal device through the first path, and the terminal device can transmit uplink services with the first network device or the second network device through the first path or the second path.

[0084] The downlink quality of the downlink signal of the first network device received by the terminal device will be affected by the transmission distance, the transmission environment, etc. As the distance between the terminal device and the first network device increases, the downlink quality of the downlink signal of the first network device received by the terminal device shows a downward trend, such as the power of the downlink signal, the signal to interference plus noise ratio, etc. will decrease. Therefore, in a cell where a second network device is deployed, it is possible to identify (judge) whether the terminal device is located in the uplink coverage area of ​​the first network device or in the uplink coverage area of ​​the second network device based on the downlink quality. The downlink quality may be a measured value of a downlink direction signal or channel between the terminal device and the first network device, including but not limited to one or more of reference signal receiving power (reference signal receiving power, RSRP), reference signal receiving quality (reference signal receiving quality, RSRQ), reference signal signal to interference plus noise ratio (signal to interference plus noise ratio, SINR), etc.

[0085] When the cell is a cell where the second network device is deployed, a quality threshold value (TH) for determining whether the terminal device is located in the uplink coverage area of ​​the first network device or in the uplink coverage area of ​​the second network device may be preconfigured or set in the first network device. ULonly ), or the first network device may determine the quality threshold value according to a corresponding algorithm, which is not limited in the embodiments of the present application. For example, when the downlink quality is RSRP, the quality threshold value is the RSRP threshold value, and when the downlink quality is SINR, the quality threshold value is the SINR threshold value.

[0086] In addition, when the cell is a cell in which a second network device is deployed, the downlink path loss determined by the first terminal device is the downlink path loss of the first path. If the terminal device is located in the uplink coverage area of ​​the second network device, the uplink transmit power of the second path is determined based on the downlink path loss of the first path, which will cause the determined uplink transmit power to not match the receiving power required by the second network device. Therefore, in an embodiment of the present application, a path loss bias (pathloss delta) may also be pre-configured or set in the first network device. The path loss bias can be used to correct the downlink path loss of the first path to obtain the downlink path loss of the second path.

[0087] It can be understood that the above-mentioned path loss bias can also be replaced by a transmit power bias, wherein the transmit power bias can be determined according to the path loss bias, for example: equal to the path loss bias. When the terminal device is located in the uplink coverage area of ​​the second network device, the terminal device determines the uplink transmit power of the first path (or the uncorrected uplink transmit power of the second path) based on the downlink path loss of the first path, and then corrects the determined uplink transmit power of the first path (or the uncorrected uplink transmit power of the second path) according to the above-mentioned transmit power bias. The terminal device can also eliminate the difference between the downlink path loss of the first path and the downlink path loss of the second path to obtain the accurate uplink transmit power of the second path. The above-mentioned method of obtaining the uplink transmit power of the second path based on the transmit power bias is similar to the method of obtaining the downlink path loss of the second path based on the path loss bias. The following embodiments are described by taking the path loss bias as an example.

[0088] As an example, the first information including the quality threshold value and the path loss bias can be sent by the first network device to the terminal device via a broadcast or multicast message, or via a radio resource control (RRC) message dedicated to the terminal device, or other RRC configuration messages, or MAC control element (CE) signaling.

[0089] S502: The terminal device obtains downlink quality. When the downlink quality is not lower than the quality threshold, S503A and S503B are performed. When the downlink quality is lower than the quality threshold, S504A and S504B are performed.

[0090] For example, for downlink qualities such as RSRP, RSRQ and SINR, the terminal device can obtain them by downlink measurement. For example, RSRP is obtained according to the average value of the signal power received on all resource elements (RE) carrying the reference signal in a symbol of the downlink signal of the first network device; RSRQ is obtained according to the ratio of the RSRP to the received signal strength indication (RSSI) of the downlink signal; SINR is obtained according to the ratio of the strength of the useful signal in the received downlink signal of the first network device to the strength of the interference signal (noise and interference).

[0091] After the terminal device obtains the downlink quality (the downlink quality of the first path), the terminal device identifies (judges) whether the terminal device is located in the uplink coverage area of ​​the first network device or the uplink coverage area of ​​the second network device based on the quality threshold value and the obtained downlink quality. When the downlink quality is not lower than the quality threshold, it means that the distance between the terminal device and the first network device is small, the terminal device is located in the uplink coverage area of ​​the first network device, and the terminal device needs to transmit uplink services through the first path; when the downlink quality is lower than the quality threshold, it means that the distance between the terminal device and the first network device is large, the terminal device is located in the uplink coverage area of ​​the second network device, and the terminal device needs to transmit uplink services through the second path.

[0092] As a possible implementation method, the terminal device can identify (judge) whether the terminal device is located in the uplink coverage area of ​​the first network device or the uplink coverage area of ​​the second network device based on its location information. The first information includes reference point location information (such as the location information of the first network device or the location information of the second network device) and a distance threshold. The terminal device can determine whether the terminal device is located in the uplink coverage area of ​​the first network device or the uplink coverage area of ​​the second network device based on its location information, the reference point location information, and the distance threshold. For example, the terminal device compares the distance between its location information and the reference point location information with the distance threshold. If it is less than or equal to the distance threshold, the terminal device determines that it is in the uplink coverage area of ​​the reference point; otherwise, the terminal device determines that it is not in the uplink coverage area of ​​the reference point.

[0093] S503A: The terminal device determines a first downlink path loss according to the transmit power of the first network device and the downlink quality obtained by the terminal device;

[0094] When the downlink quality obtained (measured) by the terminal device is not lower than the quality threshold value, it means that the terminal device is located in the uplink coverage area of ​​the first network device, and the terminal device selects the first network device for uplink service transmission. The terminal device determines the downlink path loss of the first path, that is, the first downlink path loss, based on the transmit power of the first network device and the downlink quality obtained by the terminal device. For example, for the downlink path loss of the first path, the terminal device can obtain it based on the difference between the signal strength of the downlink signal sent in the downlink signal of the first network device (the transmit power of the first network device) and the RSRP obtained (measured) by the terminal device.

[0095] S503B: The terminal device determines the uplink transmission power of the first path according to the first downlink path loss.

[0096] The terminal device compensates the first receiving target power of the first network device according to the downlink path loss of the first path, and determines the uplink transmission power of the first path. As an example, the terminal device can directly determine the uplink transmission power of the first path according to the sum of the downlink path loss of the first path and the first receiving target power; optionally, the terminal device can also adopt an open-closed loop power control strategy in the uplink transmission power control, and determine the uplink transmission power of the first path according to the downlink path loss of the first path and the first receiving target power, which is not limited in the embodiments of the present application.

[0097] Among them, the first receiving target power can be indicated or configured by the first network device for the terminal device through signaling (such as RRC signaling, system message, or downlink control information (DCI)).

[0098] S504A: The terminal device determines a second downlink path loss according to the transmit power of the first network device, the downlink quality obtained by the terminal device, and the path loss bias;

[0099] When the downlink quality obtained (measured) by the terminal device is lower than the quality threshold, it indicates that the terminal device is located in the uplink coverage area of ​​the second network device, and the terminal device selects the second network device for uplink service transmission. The terminal device can correct the downlink path loss of the first path according to the path loss bias to obtain the downlink path loss of the second path (i.e., the second downlink path loss). For example, the downlink path loss of the second path is obtained according to the sum of the path loss bias and the downlink path loss of the first path.

[0100] S504B: The terminal device determines the uplink transmission power of the second path according to the second downlink path loss.

[0101] In an embodiment of the present application, when the first network device does not indicate the second receiving target power of the second network device, the terminal device may assume that the receiving target power of the first network device and the second network device is the same. Optionally, the receiving target power may be the receiving target power of the preamble code. The terminal device compensates the first receiving target power according to the downlink path loss of the second path and determines the uplink transmit power of the second path. As an example, the terminal device may directly determine the uplink transmit power of the second path based on the sum of the obtained downlink path loss of the second path and the first receiving target power; optionally, the terminal device may also adopt an open-closed-loop power control strategy in the uplink transmit power control, etc., to determine the uplink transmit power of the second path according to the downlink path loss of the second path and the first receiving target power, and the embodiment of the present application does not limit this.

[0102] In a possible implementation, in order to improve the accuracy of determining the uplink transmission power and avoid interference with other uplink service transmissions, the first information sent by the first network device to the terminal device may also include a second receiving target power corresponding to the second network device. The terminal device may also correct the downlink path loss of the first path according to the path loss bias to obtain the downlink path loss of the second path, and compensate the second receiving target power according to the obtained downlink path loss of the second path to determine the uplink transmission power of the second path.

[0103] In addition, the TA determined by the first network device is usually determined based on the transmission deviation between the terminal device and the first network device (such as the transmission time caused by the distance). When the terminal device is located in the uplink coverage area of ​​the second network device, since the distance between the terminal device and the second network device is less than the distance between the terminal device and the first network device, the TA determined by the first network device based on the transmission deviation between the terminal device and the first network device will not be applicable to the uplink service transmission between the terminal device and the second network device. In order to avoid interference between the uplink service transmissions of different terminal devices, in an embodiment of the present application, when the terminal device is located in the uplink coverage area of ​​the second network device, it is also necessary to determine the TA corresponding to the second network device.

[0104] In a possible implementation, the terminal device adjusts the TA (corresponding to the TA of the first network device) sent by the first network device according to the timing advance bias (TA delta) to obtain the TA corresponding to the second network device. As an example, the terminal device may determine the TA corresponding to the second network device according to the difference between the TA corresponding to the first network device and the TA delta. Optionally, the terminal device may also adjust the TA sent by the first network device according to the TA adjustment coefficient to obtain the TA corresponding to the second network device. As an example, the terminal device may determine the TA corresponding to the second network device according to the product of the TA corresponding to the first network device and the TA adjustment coefficient. In this embodiment of the present application, the timing advance bias or TA adjustment coefficient may be pre-configured or set in the terminal device, and may also be pre-configured or set in the first network device, and may be sent to the terminal device through a first message or other messages or signaling.

[0105] In another possible implementation, when the cell is a cell in which a second network device is deployed, a timing advance bias or TA adjustment coefficient for adjusting the TA corresponding to the first network device may be pre-configured or set in the first network device. After determining the TA corresponding to the first network device, the first network device may also determine the TA corresponding to the second network device based on the timing advance bias or TA adjustment coefficient. The first network device may also send the TA corresponding to the first network device, and the TA corresponding to the second network device or the timing advance bias or TA adjustment coefficient to the terminal device. The terminal device selects the corresponding TA or determines the corresponding TA based on whether it is located in the uplink coverage area of ​​the first network device or the uplink coverage area of ​​the second network device. For example, the TA corresponding to the first network device, and the TA corresponding to the second network device or the timing advance bias or TA adjustment coefficient are sent to the terminal device through a first message or other messages or signaling.

[0106] After the terminal device determines the uplink transmission power and the corresponding TA, the terminal device can perform uplink service transmission according to the uplink transmission power and the corresponding TA, such as sending a random access request according to the uplink transmission power and the corresponding TA to initiate random access. Among them, for the selection of random access preamble and random access mode (such as two-step or four-step random access), the terminal device can determine it according to the downlink path loss of the first path. For example, when the downlink path loss is lower than the downlink path loss threshold, two-step random access is selected, and the random access preamble in group B is selected; when the downlink path loss is not lower than the downlink path loss threshold, four-step random access is selected, and the random access preamble in groupA is selected. Among them, when four-step random access is selected, the random access request (message 1 (msg1)) sent by the terminal device to the network device includes a random access preamble. When two-step random access is selected, the random access request (message A (msgA)) sent by the terminal device to the network device includes a random access preamble and uplink data, wherein the uplink data may also be referred to as an uplink payload (UL payload), which may be an RRC connection establishment request, an RRC reconstruction request, an RRC connection recovery request, a beam recovery request, etc., which is similar to the role played by message 3 (msg3) in four-step random access. Optionally, the terminal device may also receive the maximum number of transmissions of the first preamble code and the maximum number of transmissions of the second preamble code sent by the first network device. The maximum number of transmissions of the first preamble code is the maximum number of times the terminal device sends a preamble code on the first path, and the maximum number of transmissions of the second preamble code is the maximum number of times the terminal device sends a preamble code on the second path.

[0107] When the random access of the terminal device fails, if the second power climbing step corresponding to the second network device is not pre-configured or set in the terminal device, or the second power climbing step corresponding to the second network device sent by the first network device is not received, the terminal device can default to the first power climbing step corresponding to the first network device, which is equal to the second power climbing step corresponding to the second network device. The terminal device can determine the target power climbing step according to the number of random access retransmissions and the first power climbing step corresponding to the first network device, adjust the determined initial uplink transmission power according to the target power climbing step, and resend the random access request. That is, when the first power climbing step corresponding to the first network device is equal to the second power climbing step corresponding to the second network device, the same power climbing mechanism is adopted regardless of whether the terminal device is located in the uplink coverage area of ​​the first network device or the uplink coverage area of ​​the second network device.

[0108] Optionally, the first network device may also send a second power climbing step length or a power climbing step length adjustment coefficient corresponding to the second network device to the terminal device. For example, the first network device sends the first power climbing step length corresponding to the first network device and the second power climbing step length corresponding to the second network device to the terminal device through a first message or other message or signaling, wherein the first power climbing step length and the second power climbing step length may be the same or different. When the terminal device determines that it is located in the uplink coverage area of ​​the second network device, after the terminal device fails to send a random access request, the uplink transmission power is increased based on the second power climbing step length corresponding to the second network device, and the random access request is resent according to the increased uplink transmission power. Optionally, the second power climbing step length or the power climbing step length adjustment coefficient corresponding to the second network device may also be pre-configured or set in the terminal device. For example, the terminal device may calculate the second power climbing step length corresponding to the second network device based on the pre-configured power climbing step length adjustment coefficient and the first power climbing step length corresponding to the first network device.

[0109] It should be understood that in an embodiment of the present application, after random access fails, the random access preamble included in the random access request resent by the terminal device may be the same as or different from the random access preamble included in the random access request sent by the terminal device before the random access fails, and the embodiment of the present application does not limit this.

[0110] In addition, it should be understood that the above is an example of a cell (carrier) where the first network device and the second network device are deployed at the same time, and the determination of uplink transmission power, TA, etc. is described. It can be understood that the technical solution provided in the embodiment of the present application can also be applied to other scenarios where the first network device and the second network device are deployed at the same time, and the determination of uplink transmission power, TA, etc. For example: it is also applicable to a certain beam (frequency band) where the first network device and the second network device are deployed at the same time, and the determination of uplink transmission power, TA, etc. For specific details of the determination of uplink transmission power, TA, etc., please refer to the above-mentioned case where the first network device and the second network device are deployed at the same time in the cell, and the relevant details of the determination of uplink transmission power, TA, etc. will not be repeated here.

[0111] [Example 2]

[0112] Figure 6 A communication process diagram provided in an embodiment of the present application includes:

[0113] S601: The terminal device receives second information from the first network device, where the second information includes a first parameter and a second parameter for the first cell.

[0114] Among them, the first parameter is used for the first terminal device to perform cell selection or cell reselection, and the second parameter is used for the second terminal device to perform cell selection or cell reselection. The first terminal device is a terminal device that supports uplink service transmission through the first network device and the second network device, and the second terminal device is a terminal device that only supports uplink service transmission through the first network device.

[0115] Reference Figure 2 and Figure 7 As shown, when the cell is a cell in which a second network device is deployed, if the terminal device supports uplink service transmission through the first network device and the second network device, the terminal device is located in the uplink coverage area (area 2) of the second network device and can also transmit the uplink service normally; but if the terminal device only supports uplink service transmission through the first network device, the terminal device is located in the uplink coverage area (area 2) of the second network device and cannot transmit the uplink service normally, and can only transmit the uplink service normally in the uplink coverage area (area 1) of the first network device.

[0116] Based on this, depending on whether the cell (serving cell) in which the terminal device currently resides is a cell where the second network device is deployed, the terminal device faces two scenarios of cell selection or cell reselection.

[0117] Scenario 1: The serving cell of the terminal device is a cell where the second network device is deployed. Figure 7 As shown, when the terminal device supports uplink service transmission through the first network device and the second network device (that is, when it is a first terminal device), the terminal device located in area 1 and area 2 can continue to reside in the service cell; when the terminal device only supports uplink service transmission through the first network device (that is, when it is a second terminal device), the terminal device located in area 1 can continue to reside in the service cell, and the terminal device located in area 2 needs to reselect to other cells.

[0118] Scenario 2: The service cell of the terminal device is a cell where no second network device is deployed. Regardless of whether the terminal device supports uplink service transmission through the first network device and the second network device (i.e., whether it is the first terminal device or the second terminal device), the terminal device can continue to reside in the service cell only if it is located in area 1.

[0119] In addition, when selecting or reselecting a cell, the selection requirements for the neighboring cell are the same as those for the above-mentioned service cell. For example: for a neighboring cell where a second network device is deployed, when the terminal device supports uplink service transmission through the first network device and the second network device, the terminal device can reside in both area 1 and area 2 of the neighboring cell; for a neighboring cell where a second network device is not deployed, regardless of whether the terminal device supports uplink service transmission through the first network device and the second network device, the terminal device can reside in the neighboring cell only if it is located in area 1 of the neighboring cell.

[0120] Therefore, in the embodiment of the present application, when the terminal device performs cell selection or cell reselection, it is necessary to consider the influence of the cell where the second network device is deployed (for the convenience of description, the "cell where the second network device is deployed" is referred to as the first cell below), and it is necessary to optimize the parameters for the terminal device to perform cell selection or reselection, so as to avoid the terminal device from performing cell reselection too early or too late, which affects the service transmission performance of the terminal device. It should be understood that the first cell can be the service cell of the terminal device or the neighboring cell of the terminal device, and the embodiment of the present application does not limit this.

[0121] Optionally, unlike a cell in which the second network device is not deployed, the first network device only sends one parameter (such as a minimum reception level (q-RxLevMin2)) to the terminal device for the terminal device to perform cell selection or cell reselection. For the first cell (the cell in which the second network device is deployed), the first network device sends second information to the terminal device, wherein the second information includes a first parameter for the first terminal device to perform cell selection or cell reselection, and a second parameter for the second terminal device to perform cell selection or cell reselection.

[0122] In one possible implementation, the first parameter is used to indicate the minimum reception level (q-RxLevMin1) required by the first cell for uplink service transmission to the first terminal device, and the second parameter is used to indicate the minimum reception level (q-RxLevMin2) required by the first cell for uplink service transmission to the second terminal device.

[0123] In another possible implementation, the first parameter is used to determine the minimum reception level (q-RxLevMin1) required by the first cell for uplink service transmission to the first terminal device; the second parameter is used to determine the minimum reception level (q-RxLevMin2) required by the first cell for uplink service transmission to the second terminal device. As an example, the second parameter directly indicates the minimum reception level (q-RxLevMin2) required by the first cell for uplink service transmission to the second terminal device, and the first parameter indicates the difference (q-RxLevMinUL-offset) between the minimum reception level (q-RxLevMin1) required by the first cell for uplink service transmission to the first terminal device and the minimum reception level (q-RxLevMin2) required by the first cell for uplink service transmission to the second terminal device. The terminal device can determine q-RxLevMin1 based on the sum of q-RxLevMin2 and q-RxLevMinUL-offset.

[0124] For example, the second network device is deployed in the serving cell and the second network device is not deployed in the neighboring cell 1. The second message may include the first parameter and the second parameter for the serving cell and the second parameter for the neighboring cell 1, to determine q-RxLevMin1 and q-RxLevMin2 of the serving cell and q-RxLevMin2 of the neighboring cell.

[0125] Taking the example that the service cell is not deployed with the second network device and cell 1 is deployed with the second network device, the second message may include the second parameter for the service cell, and the first parameter and the second parameter for the neighboring cell 1, to determine the q-RxLevMin2 of the service cell, and the q-RxLevMin1 and q-RxLevMin2 of the neighboring cell.

[0126] Taking the example that both the serving cell and the neighboring cell are deployed with the second network device, the second message may include the first parameter and the second parameter for the serving cell, and the first parameter and the second parameter for the neighboring cell 1, to determine the q-RxLevMin1 and q-RxLevMin2 of the serving cell, and the q-RxLevMin1 and q-RxLevMin2 of the neighboring cell.

[0127] As an example, the first network device may send the second information to the terminal device via a broadcast or multicast message, or via a terminal device-specific RRC message, or other RRC configuration message.

[0128] S602: The terminal device determines parameters for cell selection or cell reselection according to the second information and whether the terminal device supports uplink service transmission through the second network device.

[0129] The S value (such as the cell selection reception level value (Srxlev)) is required for both cell selection and cell reselection, where the S value can be determined based on parameters such as the reception level value (Qrxlevmeas) measured by the terminal device and the minimum reception level (q-RxLevMin) required by the cell. It can be understood that the S value includes the S value of the serving cell, or the S value of the serving cell and the S value of the neighboring cell. Figure 8 As shown, when the service cell where the terminal device resides is the first cell, the first network device can send a first message to the terminal device for the terminal device to obtain q-RxLevMin1 and q-RxLevMin2. Usually q-RxLevMin2 is greater than q-RxLevMin1. Taking the service cell deployed with a second network device as an example, when the terminal device supports uplink service transmission through the first network device and the second network device (that is, when it is the first terminal device), the terminal device determines the S value of the service cell based on the Qrxlevmeas and q-RxLevMin1 of the service cell; when the terminal device only supports uplink service transmission through the first network device (that is, when it is the second terminal device), the terminal device determines the S value of the service cell based on the Qrxlevmeas and q-RxLevMin2 of the service cell. For the determination of the S value of the neighboring cell, if the neighboring cell is a cell where the second network device is deployed, the terminal device determines the S value of the neighboring cell based on the q-RxLevMin1 (applicable to the first terminal device) or q-RxLevMin2 (applicable to the second terminal device) of the neighboring cell. If the neighboring cell is not a cell with a second network device deployed, the terminal device determines the S value of the neighboring cell based only on q-RxLevMin2 (applicable to the first terminal device and the second terminal device). Optionally, if the serving cell is a cell without a second network device deployed, the terminal device also determines the S value of the serving cell based only on q-RxLevMin2 (applicable to the first terminal device and the second terminal device) of the serving cell.

[0130] Reference Fig. 9As shown, the frequencies (frequency points) corresponding to the cells are different, and the corresponding q-RxLevMin1 and / or q-RxLevMin2 may be different. That is, q-RxLevMin1 and / or q-RxLevMin2 can be frequency-level, standard-level, cell-level, slice-level, beam-level, or synchronization signal / physical broadcast channel block (SSB) level. In an embodiment of the present application, the first network device may send q-RxLevMin1 and q-RxLevMin2 corresponding to each frequency to the terminal device. When determining the S value of a neighboring cell, the terminal device determines the S value based on the q-RxLevMin1 and / or q-RxLevMin2 corresponding to the frequency of the neighboring cell.

[0131] Optionally, q-RxLevMin1 and / or q-RxLevMin2 are at the cell level for description. If part of the cells at a certain frequency are first cells and part are not first cells, the first network device also needs to send a list of first cells at each frequency, or a list of non-first cells, or an indication of whether the cell in the cell list at each frequency is the first cell. For a terminal device that supports uplink service transmission through the first network device and the second network device, when the cell is the first cell, q-RxLevMin1 is selected to determine the S value; when the cell is not the first cell, q-RxLevMin2 is selected to determine the S value; and for a terminal device that only supports uplink service transmission through the first network device, q-RxLevMin2 is always selected to determine the S value.

[0132] Optionally, for multiple different cells at the same frequency, considering the different requirements for their coverage range, the downlink transmission power of the first network device may be different. At this time, different q-RxLevMin1 and / or q-RxLevMin2 can be set for different neighboring cells at the same frequency, that is, q-RxLevMin1 and / or q-RxLevMin2 are cell-level. The first network device can send a cell list to the terminal device for each frequency, and each cell in the cell list corresponds to a set of q-RxLevMin1 and / or q-RxLevMin2. If q-RxLevMin1 is carried, it means that the cell is deployed with a second network device. The terminal device can determine the S value based on the q-RxLevMin1 and / or q-RxLevMin2 corresponding to the neighboring cell.

[0133] It is understandable that in various embodiments of the present application, the interaction between the first network device and the terminal device described above can also be applied to the interaction between the CU and the terminal device, or the interaction between the DU and the terminal device. It is understandable that the interaction mechanism between the network device and the terminal device in various embodiments of the present application can be appropriately modified to apply to the interaction between the CU or DU and the terminal device.

[0134] Optionally, the DU may carry the first information and / or the second information in an F1 establishment request message or a gNB-DU configuration update message, or a gNB-CU configuration update confirmation message and send it to the CU, so that the CU and the terminal device may exchange the first information and / or the second information with reference to the above-mentioned embodiment or a variation of the embodiment.

[0135] Optionally, the CU may carry the first information and / or the second information in an F1 establishment response message, or a gNB-CU configuration update message, or a gNB-DU configuration update confirmation message and send it to the DU, so that the DU and the terminal device may exchange the first information and / or the second information with reference to the above-mentioned embodiment or a variation of the embodiment.

[0136] The above mainly introduces the solution provided by the present application from the perspective of the interaction between the first network device and the terminal device. It can be understood that in order to realize the above functions, each network element includes a hardware structure and / or software unit (or module) corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in this document, the present application 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 this application.

[0137] In the case of integrated units (modules), Fig.10 A possible exemplary block diagram of a communication device involved in an embodiment of the present application is shown. The device 1000 may exist in the form of software. The device 1000 may include: a processing unit 1002 and a transceiver unit 1003.

[0138] In one possible design, the processing unit 1002 is used to implement the corresponding processing function. The transceiver unit 1003 is used to support the communication between the device 1000 and other network entities. Optionally, the transceiver unit 1003 may include a receiving unit and / or a sending unit, which are respectively used to perform receiving and sending operations. Optionally, the device 1000 may also include a storage unit 1001 for storing program code and / or data of the device 1000.

[0139] The apparatus 1000 may be a terminal device in any of the above embodiments, or may be a component such as a chip set in a terminal device. The processing unit 1002 may support the apparatus 1000 in executing the actions of the terminal device in each method example above. Alternatively, the processing unit 1002 mainly executes the internal actions of the terminal device in the method example, and the transceiver unit 1003 may support the communication between the apparatus 1000 and the network device.

[0140] Specifically, in a possible embodiment, the transceiver unit 1003 is configured to receive first information from a first network device, where the first information includes a quality threshold value and a path loss offset;

[0141] Processing unit 1002 is used to obtain the downlink quality and the downlink path loss of the first path; and when it is determined that the downlink quality is lower than the quality threshold value, determine the uplink transmission power of the second path according to the downlink path loss and the path loss bias, where the second path is the communication path between the terminal device and the second network device.

[0142] In one possible design, if the first information also includes a second receiving target power corresponding to the second network device, when the processing unit 1002 determines the uplink transmit power of the second path based on the downlink path loss and the path loss bias, it is specifically used to determine the uplink transmit power of the second path based on the downlink path loss, the path loss bias and the second receiving target power.

[0143] In one possible design, the processing unit 1002 is further used to determine a target power climbing step size based on the number of random access retransmissions and a second power climbing step size corresponding to the second network device; and adjust the uplink transmit power according to the target power climbing step size.

[0144] In one possible design, the processing unit 1002 is further used to determine a TA corresponding to the second network device.

[0145] In another possible embodiment, the transceiver unit 1003 is used to receive second information from the first network device, where the second information includes a first parameter and a second parameter for the first cell, wherein the first parameter is used for the first terminal device to perform cell selection or cell reselection, and the second parameter is used for the second terminal device to perform cell selection or cell reselection, the first terminal device is a terminal device that supports uplink service transmission through the first network device and the second network device, and the second terminal device is a terminal device that only supports uplink service transmission through the first network device;

[0146] The processing unit 1002 is used to determine parameters for cell selection or cell reselection according to the second information and whether the terminal device supports uplink service transmission through the second network device.

[0147] In one possible design, the first parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0148] In one possible design, the first parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0149] In one possible design, the first cell is a service cell or a neighboring cell of the terminal device.

[0150] The processing unit 1002 may be implemented by a processor, the transceiver unit 1003 may be implemented by a transceiver or a communication interface, etc., and the storage unit 1001 may be implemented by a memory.

[0151] like Fig.11 As shown, an embodiment of the present application further provides a terminal device 1100 , which includes a processor 1110 , a memory 1120 and a transceiver 1130 .

[0152] In a possible design, the memory 1120 stores instructions, programs, or data, and the memory 1120 can be used to implement the functions of the storage unit 1001 in the above embodiment. The processor 1110 is used to read the instructions, programs, or data stored in the memory 1120. When the instructions or programs stored in the memory 1120 are executed, the processor 1110 is used to execute the operations performed by the processing unit 1002 in the above embodiment, and the transceiver 1130 is used to execute the operations performed by the transceiver unit 1003 in the above embodiment.

[0153] It should be understood that the apparatus 1000 or the terminal device 1100 of the embodiment of the present application may correspond to the communication method ( Figure 5 or Figure 6 ), and the operations and / or functions of the various modules in the apparatus 1000 or the terminal device 1100 are respectively to implement Figure 5 or Figure 6 For the sake of brevity, the corresponding processes of each method in are not repeated here.

[0154] In the case of integrated units (modules), Fig.12 A possible exemplary block diagram of another communication device involved in the embodiments of the present application is shown. The communication device 1200 may exist in the form of software. The device 1200 may include: a processing unit 1202 and a transceiver unit 1203.

[0155] In one possible design, the processing unit 1202 is used to implement the corresponding processing function. The transceiver unit 1203 is used to support the communication between the device 1200 and other network entities. Optionally, the transceiver unit 1203 may include a receiving unit and / or a sending unit, which are respectively used to perform receiving and sending operations. Optionally, the device 1200 may also include a storage unit 1201 for storing program code and / or data of the device 1200.

[0156] The device 1200 may be the first network device in any of the above embodiments (for example, the first network device is the first network device in Embodiment 1), or may also be a component such as a chip set in the first network device. The processing unit 1202 may support the device 1200 to perform the actions of the first network device in each method example above. Alternatively, the processing unit 1202 mainly performs the internal actions of the first network device in the method example, and the transceiver unit 1203 may support the communication between the device 1200 and the terminal device.

[0157] Specifically, in a possible embodiment, the transceiver unit 1203 is used to send first information to the terminal device, where the first information includes a quality threshold value and a path loss bias.

[0158] In one possible design, the first information also includes a second receiving target power corresponding to the second network device.

[0159] In another possible embodiment, the transceiver unit 1203 is used to send second information to the terminal device, the second information includes a first parameter and a second parameter for the first cell, wherein the first parameter is used for the first terminal device to perform cell selection or cell reselection, and the second parameter is used for the second terminal device to perform cell selection or cell reselection, the first terminal device is a terminal device that supports uplink service transmission through the first network device and the second network device, and the second terminal device is a terminal device that only supports uplink service transmission through the first network device.

[0160] In one possible design, the first parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0161] In one possible design, the first parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the first terminal device; the second parameter is used to indicate the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

[0162] In one possible design, the first cell is a service cell or a neighboring cell of the terminal device.

[0163] The processing unit 1202 may be implemented by a processor, the transceiver unit 1203 may be implemented by a transceiver or a communication interface, etc., and the storage unit 1201 may be implemented by a memory.

[0164] like Fig.13 As shown, an embodiment of the present application further provides a network device 1300 , which includes a processor 1310 , a memory 1320 and a transceiver 1330 .

[0165] In a possible design, the memory 1320 stores instructions, programs, or data, and the memory 1320 can be used to implement the functions of the storage unit 1201 in the above embodiment. The processor 1310 is used to read the instructions, programs, or data stored in the memory 1320. When the instructions or programs stored in the memory 1320 are executed, the processor 1310 is used to perform the operations performed by the processing unit 1202 in the above embodiment, and the transceiver 1330 is used to perform the operations performed by the transceiver unit 1203 in the above embodiment.

[0166] It should be understood that the apparatus 1200 or the network device 1300 of the embodiment of the present application may correspond to the communication method ( Figure 5 or Figure 6 ), and the operations and / or functions of the various modules in the apparatus 1200 or the network device 1300 are respectively to implement Figure 5 or Figure 6 For the sake of brevity, the corresponding processes of each method in are not repeated here.

[0167] The embodiment of the present application further provides a communication device, which can be a terminal device or a circuit. The communication device can be used to execute the actions executed by the terminal device in the above method embodiment.

[0168] When the communication device is a terminal device, Fig.14 A simplified schematic diagram of the structure of a terminal device is shown. For ease of understanding and illustration, Fig.14 In the example, a mobile phone is used as the terminal device. Fig.14As shown, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used to process communication protocols and communication data, as well as to control the terminal device, execute software programs, process software program data, etc. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for conversion between baseband signals and radio frequency signals and processing of radio frequency signals. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input-output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input-output devices.

[0169] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Fig.14 Only one memory and processor are shown. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device. The memory may be set independently of the processor or may be integrated with the processor, and the embodiments of the present application do not limit this.

[0170] In the embodiments of the present application, the antenna and the radio frequency circuit with transceiver functions may be regarded as the transceiver unit (or communication unit) of the terminal device, and the processor with processing function may be regarded as the processing unit of the terminal device. Fig.14 As shown, the terminal device includes a transceiver unit 1410 and a processing unit 1420. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. The processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, etc. Optionally, the device used to implement the receiving function in the transceiver unit 1410 may be regarded as a receiving unit, and the device used to implement the sending function in the transceiver unit 1410 may be regarded as a sending unit, that is, the transceiver unit 1410 includes a receiving unit and a sending unit. The transceiver unit may also be sometimes referred to as a transceiver, a transceiver, or a transceiver circuit, etc. The receiving unit may also be sometimes referred to as a receiver, a receiver, or a receiving circuit, etc. The sending unit may also be sometimes referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0171] It should be understood that the transceiver unit 1410 is used to perform sending operations and receiving operations on the terminal device side in the above method embodiment, and the processing unit 1420 is used to perform other operations on the terminal device except the sending and receiving operations in the above method embodiment.

[0172] For example, in one implementation, the transceiver unit 1410 is used to execute Figure 5 The sending and receiving operations on the terminal device side in S501, and / or the transceiver unit 1410 is also used to perform other sending and receiving steps on the terminal device side in the embodiment of the present application. The processing unit 1420 is used to perform Figure 5 The processing operation on the terminal device side in S502, and / or the processing unit 1420 is also used to execute other processing steps on the terminal device side in the embodiment of the present application.

[0173] As another form of this embodiment, a computer-readable storage medium is provided, on which instructions are stored. When the instructions are executed, the method on the terminal device side in the above method embodiment can be executed.

[0174] As another form of this embodiment, a computer program product including instructions is provided, and when the instructions are executed, the method on the terminal device side in the above method embodiment can be executed.

[0175] When the device in this embodiment is a network device, the network device can be as follows Fig.15 As shown, the device 1500 includes one or more radio frequency units, such as a remote radio unit (RRU) 1510 and one or more baseband units (BBU) (also referred to as digital units, DU) 1520. The RRU 1510 can be referred to as a transceiver unit. Fig.12 The RRU 1510 corresponds to the transceiver unit 1203 in the figure. Optionally, the transceiver unit can also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1511 and a radio frequency unit 1512. The RRU 1510 part is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals into baseband signals, for example, for sending configuration information to terminal devices. The BBU 1520 part is mainly used for baseband processing, controlling the base station, etc. The RRU 1510 and the BBU 1520 can be physically arranged together or physically separated, that is, a distributed base station.

[0176] The BBU 1520 is the control center of the base station, which can also be called a processing module. Fig.12 The processing unit 1202 in the embodiment corresponds to the processing unit 1202, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, etc. For example, the BBU (processing module) can be used to control the base station to execute the operation process of the network device in the above method embodiment, for example, to generate the above indication information, etc.

[0177] In one example, the BBU 1520 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network of a single access standard (such as an LTE network), or may respectively support wireless access networks of different access standards (such as an LTE network, a 5G network, or other networks). The BBU 1520 also includes a memory 1521 and a processor 1522. The memory 1521 is used to store necessary instructions and data. The processor 1522 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation process of the first network device in the above method embodiment. The memory 1521 and the processor 1522 may serve one or more single boards. In other words, a memory and a processor may be separately set on each single board. It is also possible that multiple single boards share the same memory and processor. In addition, necessary circuits may be set on each single board.

[0178] As another form of this embodiment, a computer-readable storage medium is provided, on which instructions are stored. When the instructions are executed, the method on the first network device side in the above method embodiment can be executed.

[0179] As another form of this embodiment, a computer program product including instructions is provided, and when the instructions are executed, the method on the first network device side in the above method embodiment can be executed.

[0180] In the implementation process, each step in the method provided in this embodiment can be completed by an integrated logic circuit of hardware in a processor or by instructions in the form of software. The steps of the method disclosed in the embodiment of the present application can be directly embodied as being executed by a hardware processor, or by a combination of hardware and software modules in a processor.

[0181] It should be noted that the processor in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit in the processor or the instructions in the form of software. The above processor 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 also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessors, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0182] It can be understood that the memory or storage unit in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0183] 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 programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed 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 program or instruction may be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a tape; it may also be an optical medium, such as a DVD; it may also be a semiconductor medium, such as a solid state disk (SSD).

[0184] 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.

[0185] The steps of the method or algorithm described in the embodiments of the present application can be directly embedded in the hardware, the software unit executed by the processor, or the 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. Optionally, the storage medium can also be integrated into the processor. The processor and the storage medium can be arranged in an ASIC, and the ASIC can be arranged in a terminal device. Optionally, the processor and the storage medium can also be arranged in different components in the terminal device.

[0186] 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. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0187] Although the embodiments of the present application are described in conjunction with specific features, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of the embodiments of the present application. Accordingly, this specification and the accompanying drawings are merely exemplary illustrations of the embodiments 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 embodiments of the present application.

Claims

1. A communication method, It is characterized in that include: The first network device sends first information, where the first information includes a quality threshold value and a path loss offset; receiving first information from the first network device, the first information including a quality threshold and a path loss offset; Acquire downlink quality and downlink path loss of the first path; When it is determined that the downlink quality is lower than the quality threshold, the uplink transmission power of the second path is determined according to the downlink path loss and the path loss offset, where the second path is a communication path between the terminal device and the second network device.

2. The method according to claim 1, It is characterized in that Also includes: The first network device sends a timing advance TA bias or a TA adjustment coefficient to the terminal device, the TA bias is used by the terminal device to determine the TA corresponding to the second network device based on the difference between the TA corresponding to the first network device and the TA bias, or the TA adjustment coefficient is used by the terminal device to determine the TA corresponding to the second network device based on the product of the TA corresponding to the first network device and the TA adjustment coefficient.

3. A communication method, It is characterized in that Chips used in terminal devices or in terminal devices include: Receiving first information from a first network device, the first information including a quality threshold and a path loss offset; Acquire downlink quality and downlink path loss of the first path; When it is determined that the downlink quality is lower than the quality threshold, determining the uplink transmit power of the second path according to the downlink path loss and the path loss bias, where the second path is a communication path between the terminal device and the second network device; Service transmission is performed according to the uplink transmission power.

4. The method according to any one of claims 1 to 3, It is characterized in that The first information also includes a second receiving target power corresponding to the second network device, and determining the uplink transmission power of the second path according to the downlink path loss and the path loss offset includes: The uplink transmission power of the second path is determined according to the downlink path loss, the path loss offset and the second reception target power.

5. The method according to any one of claims 1 to 4, It is characterized in that The method further comprises: Determine a target power climbing step length according to the number of random access retransmissions and a second power climbing step length corresponding to the second network device; The uplink transmit power is adjusted according to the target power climbing step size.

6. The method according to any one of claims 1 to 5, It is characterized in that The method further comprises: determining the TA corresponding to the second network device according to the difference between the timing advance TA and the TA offset corresponding to the first network device; or, The TA corresponding to the second network device is determined according to the product of the TA corresponding to the first network device and the TA adjustment coefficient.

7. The method according to claim 6, It is characterized in that The method further comprises: The TA offset or TA adjustment coefficient is received from the first network device.

8. A communication method, It is characterized in that include: receiving second information from a first network device, the second information including a first parameter and a second parameter for a first cell, wherein the first parameter is used by a first terminal device to perform cell selection or cell reselection, and the second parameter is used by a second terminal device to perform cell selection or cell reselection, the first terminal device is a terminal device that supports uplink service transmission through the first network device and the second network device, and the second terminal device is a terminal device that only supports uplink service transmission through the first network device; Parameters for cell selection or cell reselection are determined based on the second information and whether the terminal device supports uplink service transmission through the second network device.

9. A communication method, It is characterized in that include: A first network device sends second information to a terminal device, wherein the second information includes a first parameter and a second parameter for a first cell, wherein the first parameter is used by the first terminal device to perform cell selection or cell reselection, and the second parameter is used by the second terminal device to perform cell selection or cell reselection, and the first terminal device is a terminal device that supports uplink service transmission through the first network device and the second network device, and the second terminal device is a terminal device that only supports uplink service transmission through the first network device.

10. The method according to claim 8 or 9, It is characterized in that The first parameter is used to determine the minimum reception level required by the first cell for uplink service transmission to the first terminal device; The second parameter is used to determine the minimum reception level required by the first cell to transmit uplink services to the second terminal device.

11. The method according to any one of claims 8 to 10, It is characterized in that The first cell is a serving cell or a neighboring cell of the terminal equipment.

12. A communication device, It is characterized in that Used to implement the communication method as described in any one of claims 3-11.

13. A computer-readable storage medium, It is characterized in that The computer-readable storage medium includes a computer program, and when the computer program is read and executed by one or more processors, the communication method according to any one of claims 1 to 11 is implemented.

14. A computer program product, It is characterized in that The method comprises a computer program or an instruction, and when the computer program or the instruction is executed by a computer, the method according to any one of claims 1 to 11 is implemented.

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