Uplink transmission method and device

Abstract

According to the uplink transmission method and device, compared with a four-step random access scheme and a two-step random access scheme, the terminal equipment does not need to execute a random access process, the uplink signal corresponding to the uplink data can be directly sent to the network equipment (access network equipment or a base station), and the access efficiency of the terminal equipment can be improved. The method comprises: a first terminal device receiving first information from a network device, the first information indicating a first type of random access; and the first terminal equipment sends a first uplink signal corresponding to first uplink data to the network equipment according to the first information.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly, to a method and apparatus for uplink transmission. Background Art

[0002] With the popularization of the 5th generation (5G) new radio (NR) system for machine type communication (MTC) and Internet of Things (IoT) communication, more and more IoT devices have been deployed in people's lives. For example: smart water meters, shared bicycles, and devices targeting sensing and data collection such as smart cities, environmental monitoring, smart homes, forest fire prevention, etc. In the future, IoT devices will be ubiquitous, and may be embedded in every piece of clothing, every package, or every key, and almost all offline items will be enabled to go online with the empowerment of IoT technology. Since IoT devices are widely distributed and numerous in quantity, the process of realizing the interconnection of all things also poses quite a challenge to the industrial community, and reducing the power consumption of terminal devices has become the focus of attention of most companies.

[0003] In view of the future development trend of large-scale IoT deployment, the connection density of IoT devices will increase by many times. Considering the reporting requirements of a large number of IoT devices, it is bound to involve the access problem of a large number of IoT devices, and the access efficiency will directly affect the battery life of IoT devices. Studying how to achieve efficient user access within limited bandwidth can effectively alleviate the battery life problem of IoT devices.

[0004] Currently, for the four-step / two-step random access scheme, the base station side needs to estimate the time advance (TA) corresponding to the terminal device based on the narrowband physical random access channel (PRACH) signal sent by the terminal device, and notify the corresponding terminal device. Each terminal device adjusts the transmission time of the uplink signal respectively to achieve the time synchronization of the uplink signals of multiple users arriving at the base station side, and ensure the correct demodulation of the uplink signal. However, when the number of active users is large, the probability of resource collision is too high. After a resource collision, a back-off mechanism will be triggered, resulting in low access efficiency and difficulty in meeting the connection number requirements. Summary of the Invention

[0005] This application provides a method and apparatus for uplink transmission, which can improve the access efficiency of terminal devices.

[0006] In a first aspect, a method for uplink transmission is provided. This method can be executed by a first terminal device, a chip, or a chip system on the first terminal device side. The method includes: the first terminal device receives first information from a network device, where the first information indicates a first type of random access; the first terminal device sends a first uplink signal corresponding to first uplink data to the network device according to the first information.

[0007] Based on the above technical solution, the first information sent by the network device to the first terminal device indicates a first type of random access, and the first terminal device can directly send a first uplink signal corresponding to first uplink data to the network device according to the first information; compared with the four-step random access scheme and the two-step random access scheme, this scheme can improve the access efficiency of the terminal device.

[0008] In combination with the first aspect, in some implementation manners of the first aspect, the first information further indicates the length of a second signal and / or the structure of the first uplink signal, where the first uplink signal includes the second signal and a third signal.

[0009] In combination with the first aspect, in some implementation manners of the first aspect, the second signal is a cyclic prefix signal, the third signal is a data signal, and the third signal occupies one OFDM symbol. Based on this implementation manner, each OFDM symbol corresponds to a cyclic prefix signal, which can better prevent inter-symbol interference and inter-carrier interference caused by multipath time delay.

[0010] In combination with the first aspect, in some implementation manners of the first aspect, the length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the time delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

[0011] In combination with the first aspect, in some implementation manners of the first aspect, the length of the second signal is greater than or equal to 2*(T max -T min )+T D , where T D is associated with the coverage range of the serving cell and the communication environment within the coverage range, T max is the maximum transmission delay within the coverage range, and T min is the minimum transmission delay within the coverage range. Based on this implementation manner, the length of the second signal (cyclic prefix signal) is relatively long, and the network device can simultaneously demodulate the uplink signals of multiple terminal devices within a certain detection window, thereby improving the number of terminal devices accessing the network device and the demodulation performance.

[0012] In combination with the first aspect, in some implementations of the first aspect, the length of the second signal is greater than or equal to T CP +T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T CP is a known time length. Exemplarily, T CP is the length of a known cyclic prefix signal. Based on this example, compared with the length of the known cyclic prefix signal, the length of the second signal (cyclic prefix signal) is longer, and the network device can simultaneously demodulate the uplink signals of multiple terminal devices within a certain detection window, thereby improving the number of terminal devices accessing the network device and the demodulation performance.

[0013] In combination with the first aspect, in some implementations of the first aspect, the first information further indicates the first time when the network device sends the first information; the step of sending, according to the first information, a first uplink signal corresponding to the first uplink data to the network device includes: sending, according to the first information, the first uplink signal corresponding to the first uplink data to the network device at a third time, where the third time is determined according to the first information and the second time when the first information is received. Based on this implementation, after receiving the first information, the first terminal device can determine the first time when the network device sends the first information and the transmission delay (the time difference between the second time and the first time) between the first terminal device and the network device according to the first information, and determine the third time for sending the first uplink signal corresponding to the first uplink data, so as to enable the uplink signals of different terminal devices to reach the network device simultaneously, thereby realizing the simultaneous demodulation of the uplink signals of multiple terminal devices by the network device.

[0014] In combination with the first aspect, in some implementations of the first aspect, the method further includes: determining the third time according to the first information and the second time when the first information is received.

[0015] In combination with the first aspect, in some implementations of the first aspect, T3 = T u1 - 2*(T2 - T1), where T u1 is the time after a preset time offset from the end time of receiving the first information, T3 is the third time, T2 is the second time, and T1 is the first time.

[0016] In combination with the first aspect, in some implementations of the first aspect, sending, according to the first information, a first uplink signal corresponding to first uplink data to the network device includes: sending, according to the first information, the first uplink signal corresponding to the first uplink data to the network device through a Physical Uplink Shared Channel (PUSCH).

[0017] In a second aspect, a method for uplink transmission is provided. This method can be executed by a second terminal device, or a chip or chip system on the second terminal device side. The method includes: the second terminal device receives first information from the network device, where the first information indicates a first type of random access; the second terminal device sends, according to the first information, a second uplink signal corresponding to second uplink data to the network device.

[0018] The method provided in the second aspect is a method on the second terminal device side corresponding to the first aspect, and its beneficial effects can refer to the first aspect.

[0019] In combination with the second aspect, in some implementations of the second aspect, the first information further indicates a first time when the network device sends the first information; sending, according to the first information, a second uplink signal corresponding to second uplink data to the network device includes: sending, according to the first information, the second uplink signal corresponding to the second uplink data to the network device at a fifth time, where the fifth time is determined according to the first information and a fourth time when the first information is received. Based on this implementation, after receiving the first information, the second terminal device can determine the first time when the network device sends the first information and the transmission time delay between the second terminal device and the network device (the time difference between the fourth time and the first time) according to the first information, and determine the fifth time for sending the second uplink signal corresponding to the second uplink data, so as to enable the uplink signals of different terminal devices to reach the network device simultaneously, thereby enabling the network device to demodulate the uplink signals of multiple terminal devices simultaneously.

[0020] In combination with the second aspect, in some implementations of the second aspect, the method further includes: determining the fifth time according to the first information and the fourth time when the first information is received.

[0021] In combination with the second aspect, in some implementations of the second aspect, T5 = T u2 -2*(T4 - T1), where T u1 is a time after the end time of receiving the first information with a preset time offset, T5 is the fifth time, T4 is the fourth time, and T1 is the first time.

[0022] In combination with the second aspect, in some implementations of the second aspect, sending, to the network device, a second uplink signal corresponding to second uplink data according to the first information includes: sending, according to the first information, the second uplink signal corresponding to the second uplink data to the network device through PUSCH.

[0023] In a third aspect, a method for uplink transmission is provided. This method can be executed by a network device side or a chip or chip system on the network device side. The method includes: sending first information to a first terminal device and a second terminal device, where the first information indicates a first type of random access; receiving a first uplink signal corresponding to first uplink data from the first terminal device and a second uplink signal corresponding to second uplink data from the second terminal device.

[0024] Based on the above technical solution, the first information sent by the network device to the first terminal device and the second terminal device indicates a first type of random access. The first terminal device can directly send the first uplink signal corresponding to the first uplink data to the network device according to the first information, and the second terminal device can directly send the second uplink signal corresponding to the second uplink data to the network device according to the first information. Compared with the four-step random access scheme and the two-step random access scheme, this scheme can improve the access efficiency of the terminal device.

[0025] In combination with the third aspect, in some implementations of the third aspect, the first information further indicates the length of the second signal and / or the structure of the first uplink signal and the second uplink signal, where the first uplink signal includes the second signal and a third signal, and the second uplink signal includes the second signal and the third signal.

[0026] In combination with the third aspect, in some implementations of the third aspect, the second signal is a cyclic prefix signal, the third signal is a data signal, and the third signal occupies one OFDM symbol.

[0027] In combination with the third aspect, in some implementations of the third aspect, the length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

[0028] In combination with the third aspect, in some implementations of the third aspect, the length of the second signal is greater than or equal to 2*(T max -T min )+T D where T Dassociated with the coverage area of the serving cell and the communication environment within the coverage area, T max is the maximum transmission delay within the coverage area, T min is the minimum transmission delay within the coverage area.

[0029] Combined with the third aspect, in some implementations of the third aspect, the length of the second signal is greater than or equal to T CP +T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T CP is a known time length.

[0030] Combined with the third aspect, in some implementations of the third aspect, the first information further indicates the first moment when the network device sends the first information; receiving the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device includes: receiving, at the sixth moment, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device, where the first uplink signal is sent by the first terminal device at the third moment, the second uplink signal is sent by the second terminal device at the fifth moment, the third moment is determined by the first terminal device according to the first information and the second moment when the first information is received, and the fifth moment is determined by the second terminal device according to the first information and the fourth moment when the first information is received. Based on this implementation, after receiving the first information, the first terminal device can determine the first moment when the network device sends the first information and the transmission delay between the first terminal device and the network device (the time difference between the second moment and the first moment) according to the first information, and determine the third moment when the first uplink signal corresponding to the first uplink data is sent; after receiving the first information, the second terminal device can determine the first moment when the network device sends the first information and the transmission delay between the second terminal device and the network device (the time difference between the fourth moment and the first moment) according to the first information, and determine the fifth moment when the second uplink signal corresponding to the second uplink data is sent, so as to enable the first uplink signal and the second uplink signal to reach the network device simultaneously; it is possible to implement simultaneous demodulation of the uplink signals of multiple terminal devices by the network device, thereby being able to increase the number of terminal devices accessing the network device and the demodulation performance.

[0031] Combined with the third aspect, in some implementations of the third aspect, the time interval between the third moment and the fifth moment is equal to the time interval between the fourth moment and the second moment.

[0032] In combination with the third aspect, in some implementation manners of the third aspect, receiving the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device includes: receiving, through PUSCH, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device.

[0033] In a fourth aspect, a communication device is provided. The communication device may be applied to the first terminal device described in the first aspect. The communication device includes: a transceiver unit configured to receive first information from a network device, where the first information indicates a first type of random access; the transceiver unit is further configured to send, according to the first information, a first uplink signal corresponding to first uplink data to the network device.

[0034] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the first information further indicates the length of a second signal and / or the structure of the first uplink signal, where the first uplink signal includes the second signal and a third signal.

[0035] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the second signal is a cyclic prefix signal, the third signal is a data signal, and the third signal occupies one OFDM symbol.

[0036] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

[0037] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the length of the second signal is greater than or equal to 2*(T max -T min )+T D where T D is associated with the coverage range of the serving cell and the communication environment within the coverage range, T max is the maximum transmission delay within the coverage range, and T min is the minimum transmission delay within the coverage range.

[0038] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the length of the second signal is greater than or equal to T CP +T D where T Dassociated with the coverage area of the serving cell and the communication environment within the coverage area, T CP is a known length of time.

[0039] In combination with the fourth aspect, in some implementations of the fourth aspect, the first information further indicates a first moment when the network device sends the first information; the transceiver unit is specifically configured to, according to the first information, send the first uplink signal corresponding to the first uplink data to the network device at a third moment, and the third moment is determined according to the first information and a second moment when the first information is received.

[0040] In combination with the fourth aspect, in some implementations of the fourth aspect, the communication device further includes: a processing unit, configured to determine the third moment according to the first information and the second moment when the first information is received.

[0041] In combination with the fourth aspect, in some implementations of the fourth aspect, T3 = T u1 - 2*(T2 - T1), where T u1 is a moment after the end moment of receiving the first information with a preset time offset, T3 is the third moment, T2 is the second moment, and T1 is the first moment.

[0042] In combination with the fourth aspect, in some implementations of the fourth aspect, the transceiver unit is specifically configured to, according to the first information, send the first uplink signal corresponding to the first uplink data to the network device through PUSCH.

[0043] Fifth aspect, a communication device is provided. The communication device can be applied to the second terminal device described in the second aspect. The communication device includes: a transceiver unit, configured to receive first information from a network device, where the first information indicates a first type of random access; the transceiver unit is further configured to, according to the first information, send a second uplink signal corresponding to second uplink data to the network device.

[0044] In combination with the fifth aspect, in some implementations of the fifth aspect, the first information further indicates a first moment when the network device sends the first information; the transceiver unit is specifically configured to, according to the first information, send the second uplink signal corresponding to the second uplink data to the network device at a fifth moment, and the fifth moment is determined according to the first information and a fourth moment when the first information is received.

[0045] In combination with the fifth aspect, in some implementations of the fifth aspect, the communication device further includes: a processing unit, configured to determine the fifth moment according to the first information and the fourth moment when the first information is received.

[0046] In combination with the fifth aspect, in some implementations of the fifth aspect, T5 = T u2 - 2 * (T4 - T1), where T u1 is the time after a preset time offset from the end time of receiving the first information, T5 is the fifth time, T4 is the fourth time, and T1 is the first time.

[0047] In combination with the fifth aspect, in some implementations of the fifth aspect, the transceiver unit is specifically configured to send, according to the first information, the second uplink signal corresponding to the second uplink data to the network device through PUSCH.

[0048] A sixth aspect provides a communication device, which can be applied to the network device described in the third aspect. The communication device includes: a transceiver unit, configured to send first information to a first terminal device and a second terminal device, where the first information indicates a first type of random access; the transceiver unit is further configured to receive a first uplink signal corresponding to first uplink data from the first terminal device and a second uplink signal corresponding to second uplink data from the second terminal device.

[0049] In combination with the sixth aspect, in some implementations of the sixth aspect, the first information further indicates the length of a second signal, and / or the structure of the first uplink signal and the second uplink signal, where the first uplink signal includes the second signal and a third signal, and the second uplink signal includes the second signal and the third signal.

[0050] In combination with the sixth aspect, in some implementations of the sixth aspect, the second signal is a cyclic prefix signal, the third signal is a data signal, and the third signal occupies one OFDM symbol.

[0051] In combination with the sixth aspect, in some implementations of the sixth aspect, the length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

[0052] In combination with the sixth aspect, in some implementations of the sixth aspect, the length of the second signal is greater than or equal to 2 * (T max - T min ) + T D where T D is associated with the coverage range of the serving cell and the communication environment within the coverage range, T maxis the maximum transmission delay within the coverage area, T min is the minimum transmission delay within the coverage area.

[0053] Combined with the sixth aspect, in some implementations of the sixth aspect, the length of the second signal is greater than or equal to T CP + T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T CP is a known time length.

[0054] Combined with the sixth aspect, in some implementations of the sixth aspect, the first information further indicates a first moment when the network device sends the first information; the transceiver unit is specifically configured to receive, at a sixth moment, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device, the first uplink signal being sent by the first terminal device at a third moment, the second uplink signal being sent by the second terminal device at a fifth moment, the third moment being determined by the first terminal device according to the first information and a second moment when the first information is received, and the fifth moment being determined by the second terminal device according to the first information and a fourth moment when the first information is received.

[0055] Combined with the sixth aspect, in some implementations of the sixth aspect, a time interval between the third moment and the fifth moment is equal to a time interval between the fourth moment and the second moment.

[0056] Combined with the sixth aspect, in some implementations of the sixth aspect, the transceiver unit is specifically configured to receive, via PUSCH, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device.

[0057] A seventh aspect provides a communication device, including: a processor and an interface circuit, the interface circuit being configured to receive a signal from another communication device and transmit it to the processor or send a signal from the processor to another communication device, and the processor implementing, through a logic circuit or by executing code instructions, the method in any possible implementation manner of the first aspect to the third aspect or the first aspect to the third aspect.

[0058] An eighth aspect provides a communication system, including: a first terminal device in the method of the first aspect, a second terminal device in the method of the second aspect, and a network device in the method of the third aspect.

[0059] In a ninth aspect, a computer-readable storage medium is provided, and the computer-readable medium stores a computer program; when the computer program runs on a computer, the methods in the above first aspect to third aspect and any possible implementation manner among the first aspect to third aspect are executed.

[0060] In a tenth aspect, a computer program product is provided, including a computer program, and when the computer program is executed, the methods in the above first aspect to third aspect and any possible implementation manner among the first aspect to third aspect are implemented.

[0061] The solutions provided in the above fourth aspect to tenth aspect are used to implement or cooperate with the methods provided in the above first aspect to third aspect, and thus can achieve the same or corresponding beneficial effects as the first aspect to third aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of a network architecture applicable to an embodiment of the present application.

[0063] Figure 2 It is a schematic diagram of a four-step random access process.

[0064] Figure 3 It is a schematic diagram of a two-step random access process.

[0065] Figure 4 It is a schematic diagram of a multi-user uplink signal format based on orthogonal frequency division multiplexing (OFDM).

[0066] Figure 5 It is a schematic diagram of uplink transmission based on TA adjustment.

[0067] Figure 6 It is a schematic diagram of UMA.

[0068] Figure 7 It is a schematic flowchart of a method for uplink transmission according to an embodiment of the present application.

[0069] Figure 8 It is a schematic flowchart of another method for uplink transmission according to an embodiment of the present application.

[0070] Figure 9 It is a schematic block diagram of a communication device according to an embodiment of the present application.

[0071] Figure 10 It is a schematic block diagram of another communication device according to an embodiment of the present application.

[0072] Figure 11It is a schematic block diagram of another communication device according to an embodiment of the present application.

[0073] Figure 12 It is a schematic block diagram of another communication device according to an embodiment of the present application. Detailed implementation manners

[0074] Next, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0075] Embodiments of the present application can be applied to various communication systems, such as wireless local area network (WLAN) systems, narrow band-internet of things (NB-IoT) systems, global system for mobile communications (GSM), enhanced data rate for GSM evolution (EDGE), wideband code division multiple access (WCDMA) systems, code division multiple access 2000 (CDMA2000) systems, time division-synchronization code division multiple access (TD-SCDMA) systems, long term evolution (LTE) systems, satellite communications, 5G communication systems, sixth generation (6G) communication systems, or new communication systems that may emerge in the future.

[0076] The communication system applicable to the present application includes one or more sending ends and one or more receiving ends. Among them, the signal transmission between the sending end and the receiving end can be transmitted through radio waves, or through transmission media such as visible light, laser, infrared, and optical fiber.

[0077] Exemplarily, the sending end can be a terminal device, or a base station, or other devices capable of acquiring sensing information and / or artificial intelligence information, or a chip or chip system in these devices, and the receiving end can be a sensing center for fusing and processing sensing information and / or artificial intelligence information, or a chip or chip system in the sensing center.

[0078] The terminal devices involved in the embodiments of the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem that have wireless communication functions. The terminal may be a mobile station (MS), a subscriber unit, a user equipment (UE), a cellular phone, a smart phone, a wireless data card, a personal digital assistant (PDA) computer, a tablet computer, a wireless modem, a handset, a laptop computer, a drone, an MTC terminal, and a wireless terminal in self-driving, etc. Among them, the user equipment includes vehicle user equipment.

[0079] Exemplarily, the network device may be an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home evolved Node B, or home Node B (HNB), a baseband unit (BBU), a device that undertakes the base station function in a device-to-device (D2D) communication, an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a drone, a transmission point (TP), or a transmission and reception point (TRP), etc. It may also be a gNB or a transmission point (such as a TRP or a TP) in NR, one or a group (including multiple) of antenna panels of a base station in NR, or, it may also be a network node that constitutes a gNB or a transmission point, such as a building baseband unit (BBU) or a distributed unit (DU), etc. Alternatively, the network device may also be a vehicle-mounted device, a wearable device, and a network device in a 5G network, or a network device in an evolved public land mobile network (PLMN), or a network device deployed on a satellite, without limitation.

[0080] The product forms of network devices are very rich. For example, during product implementation, the BBU may be integrated with a radio frequency unit (RFU) in the same device, and this device is connected to an antenna array through a cable (such as but not limited to a feeder). The BBU may also be separately arranged from the RFU, and the two are connected by an optical fiber and communicate through, for example but not limited to, the common public radio interface (CPRI) protocol. In this case, the RFU is usually referred to as a remote radio unit (RRU), which is connected to the antenna array through a cable. In addition, the RRU may also be integrated with the antenna array. For example, the active antenna unit (AAU) products on the market currently adopt this structure.

[0081] In addition, the BBU can be further decomposed into multiple parts. For example, the BBU can be further subdivided into a centralized unit (CU) and a distribute unit (DU) according to the real-time nature of the services processed. The CU is responsible for processing non-real-time protocols and services, and the DU is responsible for processing physical layer protocols and real-time services. Furthermore, some physical layer functions can also be separated from the BBU or DU and integrated into the AAU.

[0082] With the popularization of MTC and IoT communications in 5G NR systems, more and more IoT devices have been deployed in people's lives. For example: smart water meters, shared bicycles, and devices targeting sensing and data collection such as smart cities, environmental monitoring, smart homes, and forest fire prevention. In the future, IoT devices will be ubiquitous, possibly embedded in every piece of clothing, every package, or every key, and almost all offline items will be enabled to go online with the empowerment of IoT technology. However, at the same time, due to the wide distribution and large number of IoT devices, the process of achieving the interconnection of all things also poses quite a challenge to the industrial community, and the power supply problem is the first and foremost. Currently, IoT is still mainly promoted by operators, and IoT modules need to use standard cellular protocols to communicate with base stations. Since base stations need to cover as large an area as possible, IoT modules need to be able to communicate even when they are far from the base station, which means that IoT devices still consume up to 30 mA of current during wireless communication. Therefore, current IoT modules still need to use relatively high-capacity batteries to operate, which also makes it difficult to reduce the size of IoT modules and increases the cost of IoT devices.

[0083] In addition, some low-power terminals play an important role in Internet of Things (IoT) applications such as medical care, smart home, industrial sensors, and wearable devices. However, the size of such terminals is limited, and it is difficult to extend the operating time of these terminal devices by simply increasing the battery capacity. Therefore, it is necessary to reduce the power consumption of terminal devices. In the standard discussion of the 3GPP R-18 version, low-power research has become the focus of attention of most companies. Regarding low-power research, 3GPP has approved a research project on low-power wake-up signal and receiver for NR (New Radio). In addition, the low-power ambient IoT (A-IoT) has also been discussed in the current 3GPP plenary session. A-IoT is a type of ultra-low-power IoT device, mainly divided into active and passive types; active A-IoT is an active tag or active terminal that can transmit wireless communication signals by using the energy stored in its own energy storage module; passive A-IoT mainly obtains energy from external radio frequency signals and communicates by backscattering radio frequency signals, ultimately achieving ultra-low power consumption or even zero power consumption. Active A-IoT, also known as active tag, active label, etc., the embodiments of this application focus on active tag. Figure 1 It is a schematic diagram of the network architecture applicable to the embodiments of this application. This network architecture includes network devices and terminal devices. The network devices can transmit data or control information to the terminal devices, and the terminal devices can also transmit data or control information to the network devices. The network devices in the embodiments of this application can be base stations or access network devices, and the terminal devices can be active tags.

[0084] On the other hand, for the international mobile telecom system (IMT)-2030, relevant organizations have proposed that for the future development trend of large-scale IoT deployment, the connection density of IoT devices will increase by 10 to 100 times compared with IMT-2020. Considering the reporting requirements of a large number of IoT devices or sensors, it is bound to involve the access problem of a large number of IoT devices. The access efficiency will directly affect the battery life of IoT devices. Studying how to achieve efficient user access within limited bandwidth can effectively alleviate the battery life problem of IoT devices, which puts higher requirements on the existing access solutions.

[0085] To facilitate the understanding of the embodiments of this application, the following briefly introduces the technical solutions related to the embodiments of this application.

[0086] I. NB-IoT random access process

[0087] After the cell search is completed, the terminal device has achieved downlink synchronization with the cell, so the terminal device can receive downlink data. However, the terminal device can obtain uplink resources and perform uplink transmission only when it achieves uplink synchronization with the cell. The terminal device establishes a connection with the cell and achieves uplink synchronization through the random access process. Once the random access is completed, the terminal device enters the connected state, and communication can be carried out between the terminal device and the network side. The random access request is the first message sent by the terminal device to the network side after it powers on. The reason it is called random access is that from the perspective of the network side, it seems to obtain the first message of the terminal device in a random manner because it does not know when the user turns on the terminal device. When the terminal device makes an initial access or a radio resource control (RRC) reconnection, the terminal device needs to establish a connection with the network side and initiate a random access. The specific random access process is as follows.

[0088] 1. Four-step random access process

[0089] Figure 2 Figure for the four-step random access process. The specific process is as follows.

[0090] (1) The terminal device sends a random access request to the network side, which can be understood as the terminal device sending Message 1 (Msg1). Specifically, after the cell determines the number of coverage levels and the NPRACH corresponding to each coverage level, it broadcasts them to the terminal device through the system information block (SIB); the terminal device determines its own coverage level by measuring the reference signal receiving power (RSRP) of the broadcast signal, and then the terminal device sends a preamble on the NPRACH resource corresponding to this coverage level and indicates whether its Msg 3 supports multi-tone transmission.

[0091] Correspondingly, the network side receives Msg 1, determines the number of repetitions of the uplink transmission data of the terminal device and the number of subcarriers used by Msg 3, estimates the transmission delay between the base station and the terminal device based on the preamble on the NPRACH, and then calculates the TA.

[0092] (2) The network side sends Msg 2 to the terminal device, indicating the radio network temporary identifier (RNTI) assigned to this terminal device, the uplink grant (UL grant) resource assigned to Msg 3, and the TA corresponding to this terminal device.

[0093] (3) The terminal device determines whether it has successfully received the random access response (RAR) message replied by the network side according to the preamble index in Msg 2. If the RAR message is not received, the random access request is re-initiated. If the RAR message is received, the terminal device sends Msg 3 to the network side after determining the time to send Msg 3 according to the TA. Msg 3 includes an identifier unique to this terminal device, and this identifier is used to distinguish different terminal devices.

[0094] (4) The network side sends Msg 4 to the terminal device. Msg 4 includes an identifier unique to this terminal device. The terminal device monitors whether the relevant identification information is carried in Msg 4. If so, it proves that the random access is successful. Among them, the network side also indicates the time-frequency resources of the narrowband physical uplink shared channel (NPUSCH) in the physical downlink control channel (PDCCH) used to send Msg 4 to the terminal device, for the terminal device to transmit uplink data.

[0095] 2. Two-step random access procedure

[0096] Figure 3 It is a schematic diagram of the two-step random access procedure. The specific process is as follows.

[0097] (1) The terminal device sends Msg A to the network side. Msg A consists of NPRACH preamble and NPUSCH transmission, which are respectively called Msg A-NPRACH and Msg A-NPUSCH. Among them, the preamble of Msg A-NPRACH is independent of the preamble in the four-step random access procedure, and Msg A-NPRACH and the four-step random access procedure do not reuse the same preamble.

[0098] (2) After the terminal device sends Msg A, it waits for a Msg B response from the network side. 1) If the network side does not detect Msg A-NPRACH, it does not send Msg B, and the terminal device will not receive a Msg B response, and will re-transmit Msg A or return to the four-step random access procedure by sending Msg1; 2) If the network side detects Msg A-NPRACH but fails to decode Msg A-NPUSCH successfully, the network side sends a fallback RAR. After receiving the fallback RAR, the terminal device returns to the four-step random access procedure by sending Msg 3; 3) If the network side detects Msg A and decodes Msg A-NPUSCH successfully, the network side sends a Msg B to the terminal device, and this Msg B indicates the successful completion of the two-step random access. Among them, the network side also indicates the time-frequency resources of the NPUSCH in the PDCCH for the terminal device to transmit uplink data. Msg B consists of a random access response and a contention resolution message; a single Msg B can indicate the successful random access of one or more terminal devices.

[0099] (3) Uplink TA adjustment

[0100] In the random access procedure, after receiving Msg1 or MsgA, the network side estimates the TA of different terminal devices and notifies each terminal device of the corresponding TA in the subsequent downlink transmission of Msg2 or MsgB.

[0101] In cellular wireless communication, the communication signals between the terminal device and the base station are mainly based on OFDM modulation. When multiple terminal devices perform uplink transmission simultaneously (assuming different terminal devices occupy different frequency resources), it is necessary to ensure that the arrival times of the uplink signals of different terminal devices at the base station are basically the same, so as to achieve the correct demodulation of the uplink signals of multiple terminal devices. Figure 4 It is a schematic diagram of the uplink signal format for multi-user based on OFDM. Uplink signal 1 is sent by terminal device 1, and uplink signal 2 is sent by terminal device 2. The cyclic prefix (CP) signal is mainly a replicated signal of the tail signal of the OFDM signal. Its core function is to prevent inter-symbol interference and inter-carrier interference caused by multi-path time delay. Therefore, the lengths of uplink signal 1 and uplink signal 2 are both greater than the length of the OFDM signal. Among them, the lengths of CP1 and CP2 are the same. The length of the detection window is the time domain length of the OFDM signal. If the time difference between the arrival times of uplink signal 1 and uplink signal 2 at the base station is less than the length of the CP, the correct demodulation of uplink signal 1 and uplink signal 2 can be achieved within a certain detection window. For uplink signal 1 and uplink signal 2, the longer the length of the CP, the lower the spectral efficiency. To ensure the communication efficiency, the length of the CP should not be too long. Therefore, it is proposed that different terminal devices adjust the transmission times of the uplink signals respectively to ensure that the arrival times are basically the same, and finally ensure the communication efficiency.

[0102] Figure 5 It is a schematic diagram of uplink transmission based on TA adjustment. The base station sends a synchronization signal and PBCH block (SSB) at time T_b. The terminal device 1 and the terminal device 2 receive the SSB at time T_b + d1 and T_b + d2 respectively. From the perspective of the terminal device, assuming that time synchronization is completed when the SSB is received, the terminal device originally planned to send an uplink signal at a time offset of T_offset after synchronization (the start times of the transmission time windows corresponding to the terminal device 1 and the terminal device 2 are: T_u1 and T_u2). If the uplink signal is sent according to this scheme, the time delay difference between the uplink signal of the terminal device 1 and the uplink signal of the terminal device 2 when they reach the base station side is 2*(d2 - d1), which means that the length of the CP must be greater than 2*(d2 - d1). Therefore, the uplink signal of the terminal device 1 is sent 2*d1 earlier on PUSCH1, and at the same time, the uplink signal of the terminal device 2 is sent 2*d2 earlier on PUSCH2, so that the uplink signals of the terminal device 1 and the terminal device 2 can reach the base station side simultaneously.

[0103] II. Unsourced Massive Access (UMA) Technology

[0104] In the future, with the development of the Internet of Everything in motion, the number of user connections has increased significantly. Against this background, a new massive user access technology, UMA, has emerged. Figure 6 It is a schematic diagram of UMA; in the UMA technology, the terminal device can directly send data to the base station. Compared with the traditional multi-user information theory model, there are three key different assumptions in the large-scale unsourced multi-access model:

[0105] (1) All users share the same codebook, or the terminal device does not obtain the corresponding access time-frequency resources before access. Therefore, the users are "unsourced" at the receiving end. The receiving end only decodes the information transmitted by the users, without restoring the identity of each specific user; if necessary, the user can put its own identity information in the transmitted information, avoiding the complex user identity allocation and authentication process in massive user communication;

[0106] (2) The error probability is defined as the average error probability of all active users misinterpreting the decoded message; compared with the classical multi-user information theory which requires all users' messages to be correctly decoded, it is more reasonable to consider the average error probability in the massive user access scenario;

[0107] (3) The information bits transmitted by each user are limited, and the small-packet information transmission is more in line with the actual situation of the massive machine type communications (mMTC) scenario; the results obtained based on the finite blocklength analysis will be quite different from the asymptotic analysis results in traditional information theory.

[0108] The current random access scheme is a coordinated access scheme that requires multiple interactions between the base station and the terminal device to complete synchronization, resource allocation, etc. The core is to solve the resource conflict problem of multiple terminal devices and achieve the preemption and reallocation of orthogonal resources; the four-step / two-step random access scheme requires the base station side to estimate the TA corresponding to the terminal device based on the NPRACH signal sent by the terminal device and notify the corresponding terminal device. Each terminal device adjusts the transmission time of the uplink signal respectively to achieve the time synchronization of the uplink signals of multiple users arriving at the base station side and ensure the correct demodulation of the uplink signal. However, when the number of active users is large, the resource collision probability is too high. After the resource collision, the back-off mechanism will be triggered, resulting in low access efficiency and difficulty in meeting the connection number requirement.

[0109] For the UMA technology, the same time-frequency resource block supports at least one user or multiple users to transmit simultaneously, and the time-frequency resources occupied by different users can overlap. Theoretical proof shows that there is a large gain space compared with the random access scheme. However, the uplink synchronization problem between the terminal device side and the base station side has not been solved, and the access performance of the system cannot be guaranteed.

[0110] Therefore, an embodiment of this application proposes an uplink transmission method, which can improve the access efficiency of the terminal device.

[0111] Figure 7 It is a schematic flowchart of an uplink transmission method 700 according to an embodiment of this application. The network device in the embodiment of this application can be an access network device or a base station, and the first terminal device and the second terminal device can be active tags.

[0112] 710. The network device sends a first piece of information to the first terminal device, and the first piece of information indicates the first type of random access; correspondingly, the first terminal device receives the first piece of information from the network device. Exemplarily, the first piece of information is system broadcast information.

[0113] 720. The first terminal device sends a first uplink signal corresponding to the first uplink data to the network device according to the first piece of information.

[0114] Exemplarily, according to the first information, the first terminal device sends a first uplink signal corresponding to first uplink data to the network device via PUSCH. Among them, the first type of random access can be understood as one-step (1-step) access. According to the first information, the first terminal device can directly send the first uplink signal corresponding to the first uplink data to the network device via PUSCH. The first type of random access includes the above UMA.

[0115] In the technical solution provided in the embodiment of the present application, the first information sent by the network device to the first terminal device indicates the first type of random access, and the first terminal device can directly send the first uplink signal corresponding to the first uplink data to the network device according to the first information; compared with the four-step random access scheme and the two-step random access scheme, this scheme can improve the access efficiency of the terminal device.

[0116] Optionally, the first information further indicates the length of the second signal and / or the structure of the first uplink signal, where the first uplink signal includes the second signal and the third signal. Exemplarily, the first information further indicates the length of the second signal. Exemplarily, the first information further indicates the structure of the first uplink signal. Exemplarily, the first information further indicates the length of the second signal and the structure of the first uplink signal.

[0117] Optionally, the second signal is a cyclic prefix signal and the third signal is a data signal. Exemplarily, the third signal occupies one OFDM symbol; in this example, each OFDM symbol corresponds to a cyclic prefix signal, which can better prevent the inter-symbol interference and inter-carrier interference problems caused by multipath delay.

[0118] Optionally, the length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

[0119] Among them, the serving cell is the serving cell of the first terminal device; the transmission delay within the coverage range can be understood as the transmission delay between the first terminal device and the network device serving the serving cell; the maximum transmission delay within the coverage range can be understood as the maximum transmission delay between the network device serving the serving cell and different terminal devices within the coverage range of the serving cell; the minimum transmission delay within the coverage range can be understood as the minimum transmission delay between the network device serving the serving cell and different terminal devices within the coverage range of the serving cell; the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range can be understood as the delay difference between the maximum transmission delay and the minimum transmission delay between the network device serving the serving cell and different terminal devices within the coverage range of the serving cell.

[0120] Exemplarily, the length of the second signal is associated with the coverage range of the serving cell, the communication environment within the coverage range, the maximum transmission delay within the coverage range, and the minimum transmission delay within the coverage range. Exemplarily, the length of the second signal is greater than or equal to 2*(T max -T min )+T D , where T D is associated with the coverage range of the serving cell and the communication environment within the coverage range, T max is the maximum transmission delay within the coverage range, and T min is the minimum transmission delay within the coverage range. In this example, the length of the second signal (cyclic prefix signal) is relatively long, and the network device can simultaneously demodulate the uplink signals of multiple terminal devices within a certain detection window, thereby improving the number of terminal devices accessing the network device and the demodulation performance.

[0121] Exemplarily, the length of the second signal is greater than or equal to T CP +T D , where T D is associated with the coverage range of the serving cell and the communication environment within the coverage range, and T CP is a known time length. Exemplarily, T CP is the length of a known cyclic prefix signal; for example, T CP is the length of the cyclic prefix signal corresponding to the existing Msg1-NPRACH or Msg A-NPRACH. In this example, compared with the length of the known cyclic prefix signal, the length of the second signal (cyclic prefix signal) is longer, and the network device can simultaneously demodulate the uplink signals of multiple terminal devices within a certain detection window, thereby improving the number of terminal devices accessing the network device and the demodulation performance.

[0122] Optionally, the length of the second signal may also be other newly defined lengths, where the newly defined length is greater than the length of the cyclic prefix signal transmitted on the PUSCH after random access synchronization; this embodiment of the present application does not make any limitations in this regard.

[0123] Optionally, the first information further indicates the time-frequency resources for the first type of random access. Specifically, the first terminal device uses the time-frequency resources to send a first uplink signal corresponding to the first uplink data to the network device. It should be noted that the time-frequency resources for the first type of random access corresponding to different terminal devices may be the same, and the same time-frequency resources support at least one terminal device or multiple terminal devices to transmit simultaneously.

[0124] Optionally, the network device sends the first information to the first terminal device and the second terminal device, and the first information indicates the first type of random access; correspondingly, the first terminal device receives the first information from the network device, and the first terminal device sends a first uplink signal corresponding to the first uplink data to the network device according to the first information; the second terminal device receives the first information from the network device, and the second terminal device sends a second uplink signal corresponding to the second uplink data to the network device according to the first information.

[0125] Optionally, the first information further indicates the length of the second signal, and / or, the structure of the first uplink signal and the second uplink signal, where the first uplink signal includes the second signal and the third signal, and the second uplink signal includes the second signal and the third signal.

[0126] Figure 8 This is a schematic flowchart of another uplink transmission method 800 according to an embodiment of the present application. The network device in the embodiment of the present application may be an access network device or a base station, and the first terminal device and the second terminal device may be active tags.

[0127] 810. The network device sends the first information to the first terminal device and the second terminal device, and the first information indicates the first type of random access. Correspondingly, the first terminal device receives the first information from the network device, and the second terminal device receives the first information from the network device. Exemplarily, the first information is system broadcast information.

[0128] 820. The first terminal device sends a first uplink signal corresponding to the first uplink data to the network device according to the first information; correspondingly, the network device receives the first uplink signal corresponding to the first uplink data from the first terminal device.

[0129] Exemplarily, the first terminal device sends a first uplink signal corresponding to first uplink data to the network device via PUSCH according to the first information; correspondingly, the network device receives the first uplink signal corresponding to the first uplink data from the first terminal device via PUSCH. Among them, the first type of random access can be understood as 1-step access.

[0130] 830, the second terminal device sends a second uplink signal corresponding to second uplink data to the network device according to the first information; correspondingly, the network device receives the second uplink signal corresponding to the second uplink data from the second terminal device.

[0131] Exemplarily, the second terminal device sends a second uplink signal corresponding to second uplink data to the network device via PUSCH according to the first information; correspondingly, the network device receives the second uplink signal corresponding to the second uplink data from the second terminal device via PUSCH.

[0132] Among them, step 830 may be executed before step 820, or step 820 and step 830 may be executed simultaneously, and there is no limitation on this.

[0133] In the technical solution provided in the embodiments of the present application, the first information sent by the network device to the first terminal device and the second terminal device indicates the first type of random access. The first terminal device can directly send a first uplink signal corresponding to first uplink data to the network device according to the first information, and the second terminal device can directly send a second uplink signal corresponding to second uplink data to the network device according to the first information; compared with the four-step random access scheme and the two-step random access scheme, this scheme can improve the access efficiency of the terminal device.

[0134] Optionally, the first information further indicates the first moment when the network device sends the first information; the first terminal device sends a first uplink signal corresponding to first uplink data to the network device at a third moment according to the first information, and the third moment is determined according to the first information and the second moment when the first information is received; the second terminal device sends a second uplink signal corresponding to second uplink data to the network device at a fifth moment according to the first information, and the fifth moment is determined according to the first information and the fourth moment when the first information is received; the network device receives the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device at a sixth moment.

[0135] In this optional solution, after receiving the first piece of information, the first terminal device may determine, based on the first piece of information, the first moment when the network device sends the first piece of information and the transmission delay between the first terminal device and the network device (the time difference between the second moment and the first moment), and determine the third moment for sending the first uplink signal corresponding to the first uplink data; after receiving the first piece of information, the second terminal device may determine, based on the first piece of information, the first moment when the network device sends the first piece of information and the transmission delay between the second terminal device and the network device (the time difference between the fourth moment and the first moment), and determine the fifth moment for sending the second uplink signal corresponding to the second uplink data, so as to enable the first uplink signal and the second uplink signal to reach the network device simultaneously; it is possible to implement simultaneous demodulation of the uplink signals of multiple terminal devices by the network device, thereby being able to increase the number of terminal devices accessing the network device and the demodulation performance.

[0136] Optionally, the time interval between the third moment and the fifth moment is equal to the time interval between the fourth moment and the second moment.

[0137] Exemplarily, the first terminal device determines the third moment according to the first piece of information and the second moment when it receives the first piece of information; the first terminal device sends the first uplink signal corresponding to the first uplink data to the network device at the third moment; the network device receives the first uplink signal corresponding to the first uplink data from the first terminal device at the sixth moment. Exemplarily, T3 = T u1 -2*(T2 - T1), where T u1 is the moment after a preset time offset from the end moment when the first terminal device receives the first piece of information, T3 is the third moment, T2 is the second moment, and T1 is the first moment.

[0138] Exemplarily, the second terminal device determines the fifth moment according to the first piece of information and the fourth moment when it receives the first piece of information; the second terminal device sends the second uplink signal corresponding to the second uplink data to the network device at the fifth moment; the network device receives the second uplink signal corresponding to the second uplink data from the second terminal device at the sixth moment. Exemplarily, T5 = T u2 -2*(T4 - T1), where T u1 is the moment after a preset time offset from the end moment when the second terminal device receives the first piece of information, T5 is the fifth moment, T4 is the fourth moment, and T1 is the first moment.

[0139] It should be noted that the preset time offset may be predefined or configured by the network device for the first terminal device and the second terminal device, and the embodiments of the present application do not limit this.

[0140] Exemplarily, the first moment when the network device indicated by the first information sends the first information may be an absolute timestamp, and the specific format may be ×× year ×× month ×× day ×× hour ×× minute ×× second / millisecond / microsecond, or other custom formats, which are not limited herein.

[0141] The above describes the uplink transmission method provided in the embodiments of the present application. The following will introduce the execution entity for executing the above uplink transmission method.

[0142] Figure 9 It is a schematic block diagram of a communication device 900 according to an embodiment of the present application. The device may be applied to or deployed in the first terminal device in the method embodiment of the present application. The communication device 900 includes:

[0143] A transceiver unit 910, configured to receive first information from a network device, where the first information indicates a first type of random access;

[0144] The transceiver unit 910 is further configured to send a first uplink signal corresponding to the first uplink data to the network device according to the first information.

[0145] Optionally, the first information further indicates the length of a second signal and / or the structure of the first uplink signal, where the first uplink signal includes the second signal and a third signal.

[0146] Optionally, the second signal is a cyclic prefix signal, the third signal is a data signal, and the third signal occupies one OFDM symbol.

[0147] Optionally, the length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

[0148] Optionally, the length of the second signal is greater than or equal to 2*(T max -T min )+T D , where T D is associated with the coverage range of the serving cell and the communication environment within the coverage range, T max is the maximum transmission delay within the coverage range, and T min is the minimum transmission delay within the coverage range.

[0149] Optionally, the length of the second signal is greater than or equal to T CP +T D, where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, T CP is a known length of time.

[0150] Optionally, the first information further indicates a first moment when the network device sends the first information;

[0151] The transceiver unit 910 is specifically configured to send the first uplink signal corresponding to the first uplink data to the network device at a third moment according to the first information, where the third moment is determined according to the first information and a second moment when the first information is received.

[0152] Optionally, the communication device 900 further includes: a processing unit 920, configured to determine the third moment according to the first information and the second moment when the first information is received.

[0153] Optionally, T3 = T u1 -2*(T2 - T1), where T u1 is a moment after a preset time offset from the end moment of receiving the first information, T3 is the third moment, T2 is the second moment, and T1 is the first moment.

[0154] Optionally, the transceiver unit 910 is specifically configured to send the first uplink signal corresponding to the first uplink data to the network device through PUSCH according to the first information.

[0155] Figure 10 is a schematic block diagram of another communication device 1000 according to an embodiment of the present application. This device can be applied to or deployed in the second terminal device in the method embodiment of the present application. The communication device 1000 includes:

[0156] A transceiver unit 1010, configured to receive first information from a network device, where the first information indicates a first type of random access;

[0157] The transceiver unit 1010 is further configured to send a second uplink signal corresponding to second uplink data to the network device according to the first information.

[0158] Optionally, the first information further indicates a first moment when the network device sends the first information;

[0159] The transceiver unit 1010 is specifically configured to send the second uplink signal corresponding to the second uplink data to the network device at a fifth moment according to the first information, where the fifth moment is determined according to the first information and a fourth moment when the first information is received.

[0160] Optionally, the communication device 1000 further includes: a processing unit 1020, configured to determine the fifth moment according to the first information and the fourth moment when the first information is received.

[0161] Optionally, T5 = T u2 -2*(T4 - T1), where T u1 is the moment after a preset time offset from the end moment of receiving the first information, T5 is the fifth moment, T4 is the fourth moment, and T1 is the first moment.

[0162] Optionally, the transceiver unit 1010 is specifically configured to send the second uplink signal corresponding to the second uplink data to the network device through PUSCH according to the first information.

[0163] Figure 11 The following is a schematic block diagram of another communication device 1100 according to an embodiment of the present application. This device can be applied to or deployed in the network device in the method embodiment of the present application. The communication device 1100 includes:

[0164] A transceiver unit 1110, configured to send first information to a first terminal device and a second terminal device, where the first information indicates a first type of random access;

[0165] The transceiver unit 1110 is further configured to receive a first uplink signal corresponding to first uplink data from the first terminal device and a second uplink signal corresponding to second uplink data from the second terminal device.

[0166] Optionally, the first information further indicates the length of the second signal, and / or the structure of the first uplink signal and the second uplink signal, where the first uplink signal includes the second signal and a third signal, and the second uplink signal includes the second signal and the third signal.

[0167] Optionally, the second signal is a cyclic prefix signal, the third signal is a data signal, and the third signal occupies one OFDM symbol.

[0168] Optionally, the length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

[0169] Optionally, the length of the second signal is greater than or equal to 2*(T max - T min ) + TD , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T max is the maximum transmission delay within the coverage area, and T min is the minimum transmission delay within the coverage area.

[0170] Optionally, the length of the second signal is greater than or equal to T CP + T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T CP is a known time length.

[0171] Optionally, the first information further indicates a first moment when the network device sends the first information;

[0172] The transceiver unit 1110 is specifically configured to receive, at a sixth moment, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device. The first uplink signal is sent by the first terminal device at a third moment, and the second uplink signal is sent by the second terminal device at a fifth moment. The third moment is determined by the first terminal device according to the first information and a second moment when the first information is received, and the fifth moment is determined by the second terminal device according to the first information and a fourth moment when the first information is received.

[0173] Optionally, a time interval between the third moment and the fifth moment is equal to a time interval between the fourth moment and the second moment.

[0174] Optionally, the transceiver unit 1110 is specifically configured to receive, via PUSCH, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device.

[0175] Figure 12 is a schematic block diagram of another communication device 1200 according to an embodiment of the present application. The communication device 1200 includes: a processor 1210 and an interface circuit 1220. The processor 1210 and the interface circuit 1220 are coupled to each other. It can be understood that the interface circuit 1220 may be a transceiver or an input / output interface.

[0176] Optionally, the communication device 1200 may further include a memory 1230 for storing instructions executed by the processor 1210, or input data required for the processor 1210 to execute the instructions, or data generated after the processor 1210 executes the instructions.

[0177] When the communication device 1200 is applied to the first terminal device, the communication device 1200 can implement the functions of the first terminal device in the above method embodiments. When the communication device 1200 is applied to the second terminal device, the communication device 1200 can implement the functions of the second terminal device in the above method embodiments. When the communication device 1200 is applied to a network device, the communication device 1200 can implement the functions of the network device in the above method embodiments.

[0178] The above-mentioned processor 1210 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit in the hardware of the processor or instructions in software form. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by the hardware decoding processor, or executed and completed by a combination of the hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0179] Optionally, an embodiment of the present application further provides a communication device, which includes an input / output interface and a logic circuit. The input / output interface is used to obtain input information and / or output information; the logic circuit is used to execute the method in any of the above method embodiments, and process and / or generate output information according to the input information.

[0180] The embodiments of the present application further provide a communication system, including a first terminal device in the method for uplink transmission provided by the embodiments of the present application, other communication devices communicating with the first terminal device, a second terminal device, other communication devices communicating with the second terminal device, a network device, and other communication devices communicating with the network device.

[0181] The embodiments of the present application further provide a computer-readable storage medium, on which a computer program for implementing the method in the above method embodiments is stored; when the computer program runs on a computer, the method in the above method embodiments is implemented.

[0182] The embodiments of the present application further provide a computer program product, the computer program product includes a computer program, when the computer program runs on a computer, the method in the above method embodiments is executed.

[0183] The embodiments of the present application further provide a chip, including a processor, the processor is connected to a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the chip executes the method in the above method embodiments.

[0184] It should be understood that in the embodiments of the present application, numbers such as "first" and "second"... are only used to distinguish different objects, for example, to distinguish different terminal devices or uplink signals, etc., and do not limit the scope of the embodiments of the present application. The embodiments of the present application are not limited thereto.

[0185] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0186] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again.

[0187] In several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0188] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0189] In addition, in each embodiment of this application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0190] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or this part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

Claims

1. A method for uplink transmission, characterized in that, Applied to a first terminal device, the method includes: Receiving first information from a network device, the first information indicating a first type of random access; Sending, according to the first information, a first uplink signal corresponding to first uplink data to the network device.

2. The method according to claim 1, characterized in that, The first information further indicates the length of a second signal and / or the structure of the first uplink signal, where the first uplink signal includes the second signal and a third signal.

3. The method according to claim 1 or 2, characterized in that, The second signal is a cyclic prefix signal, and the third signal is a data signal, and the third signal occupies one OFDM symbol.

4. The method according to claim 2 or 3, characterized in that, The length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the delay difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

5. The method according to claim 4, characterized in that, The length of the second signal is greater than or equal to 2*(T max -T min )+T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, T max is the maximum transmission delay within the coverage area, and T min is the minimum transmission delay within the coverage area.

6. The method according to claim 4, characterized in that, The length of the second signal is greater than or equal to T CP +T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T CP is a known time length.

7. The method according to claim 1, characterized in that, The first information further indicates a first time when the network device sends the first information; The sending, according to the first information, a first uplink signal corresponding to first uplink data to the network device includes: sending, according to the first information, the first uplink signal corresponding to the first uplink data to the network device at a third time, where the third time is determined according to the first information and a second time when the first information is received.

8. The method according to claim 7, characterized in that, The method further includes: Determining the third time according to the first information and the second time when the first information is received.

9. The method according to claim 7 or 8, characterized in that, T3 = T u1 -2 * (T2 - T1), where T u1 is the time after a preset time offset from the end time of receiving the first information, T3 is the third time, T2 is the second time, and T1 is the first time.

10. The method according to any one of claims 1 to 9, characterized in that, The sending, according to the first information, a first uplink signal corresponding to first uplink data to the network device includes: Sending, according to the first information, the first uplink signal corresponding to the first uplink data to the network device through a physical uplink shared channel PUSCH.

11. A method for uplink transmission, characterized in that, Applied to a second terminal device, the method includes: Receiving first information from a network device, the first information indicating a first type of random access; Sending, according to the first information, a second uplink signal corresponding to second uplink data to the network device.

12. The method according to claim 11, characterized in that, The first information further indicates a first time when the network device sends the first information; The sending, according to the first information, a second uplink signal corresponding to second uplink data to the network device includes: sending, according to the first information, the second uplink signal corresponding to the second uplink data to the network device at a fifth time, where the fifth time is determined according to the first information and a fourth time when the first information is received.

13. The method according to claim 11 or 12, characterized in that, The method further includes: Determining the fifth time according to the first information and the fourth time when the first information is received.

14. The method according to any one of claims 11 to 13, characterized in that, T5 = T u2 -2 * (T4 - T1), where T u1 is the moment after a preset time offset from the end moment of receiving the first information, T5 is the fifth moment, T4 is the fourth moment, and T1 is the first moment.

15. The method according to any one of claims 11 to 14, characterized in that, The sending, according to the first information, a second uplink signal corresponding to second uplink data to the network device includes: Sending, according to the first information, the second uplink signal corresponding to the second uplink data to the network device through PUSCH.

16. A method for uplink transmission, characterized in that, Applied to a network device, the method includes: Sending first information to a first terminal device and a second terminal device, the first information indicating a first type of random access; Receive a first uplink signal corresponding to first uplink data from the first terminal device and a second uplink signal corresponding to second uplink data from the second terminal device.

17. The method according to claim 16, characterized in that, The first information further indicates the length of the second signal and / or the structure of the first uplink signal and the second uplink signal, where the first uplink signal includes the second signal and a third signal, and the second uplink signal includes the second signal and the third signal.

18. The method according to claim 16 or 17, characterized in that, The second signal is a cyclic prefix signal, and the third signal is a data signal, and the third signal occupies one OFDM symbol.

19. The method according to claim 17 or 18, characterized in that, The length of the second signal is associated with at least one of the following: the coverage range of the serving cell, the communication environment within the coverage range, the transmission delay within the coverage range, the maximum transmission delay within the coverage range, the minimum transmission delay within the coverage range, or the time difference between the maximum transmission delay and the minimum transmission delay within the coverage range.

20. The method according to claim 19, characterized in that, The length of the second signal is greater than or equal to 2*(T max -T min )+T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T max is the maximum transmission delay within the coverage area, and T min is the minimum transmission delay within the coverage area.

21. The method according to claim 19, characterized in that, The length of the second signal is greater than or equal to T CP +T D , where T D is associated with the coverage area of the serving cell and the communication environment within the coverage area, and T CP is a known time length.

22. The method according to claim 16, characterized in that, The first information further indicates a first time when the network device sends the first information; The receiving the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device includes: receiving, at a sixth time, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device, where the first uplink signal is sent by the first terminal device at a third time, the second uplink signal is sent by the second terminal device at a fifth time, the third time is determined by the first terminal device according to the first information and a second time when the first information is received, and the fifth time is determined by the second terminal device according to the first information and a fourth time when the first information is received.

23. The method according to claim 22, characterized in that, The time interval between the third time and the fifth time is equal to the time interval between the fourth time and the second time.

24. The method according to any one of claims 16 to 23, characterized in that, The receiving the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device includes: Receiving, via PUSCH, the first uplink signal corresponding to the first uplink data from the first terminal device and the second uplink signal corresponding to the second uplink data from the second terminal device.

25. A communication device, characterized in that, Includes a unit for performing the method according to any one of claims 1 to 10.

26. A communication device, characterized in that, Includes a unit for performing the method according to any one of claims 11 to 15.

27. A communication device, characterized in that, Includes a unit for performing the method according to any one of claims 16 to 24.

28. A communication device, characterized in that, Includes a processor and an interface circuit, where the interface circuit is configured to receive signals from other communication devices and transmit them to the processor or send signals from the processor to other communication devices, and the processor is configured to implement the method according to any one of claims 1 to 24 through logic circuits or by executing code instructions.

29. A communication system, characterized in that, It includes a first terminal device, a second terminal device, and a network device. The first terminal device is used to execute the method described in any one of claims 1 to 10, the second terminal device is used to execute the method described in any one of claims 11 to 15, and the network device is used to execute the method described in any one of claims 16 to 24.

30. A computer-readable storage medium, characterized in that, It includes: The computer-readable medium stores a computer program; When the computer program is run by a processor, the method described in any one of claims 1 to 24 is executed.

31. A computer program product, characterized in that, It includes a computer program which, when executed, enables the implementation of the method described in any one of claims 1 to 24.

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