WO2020134897A1 - Random access method, apparatus, system, and storage medium - Google Patents

Abstract

Embodiments of the present application provide a random access method, an apparatus, a system, and a storage medium. The method comprises: obtaining downlink signal receiving power of a first network device at a first frequency band, wherein the first frequency band is a downlink frequency band of the first network device but serves as a supplementary uplink (SUL) frequency band for a second network device; determining, according to the downlink signal receiving power, an actual downlink path loss of the first frequency band; determining transmission power for randomly accessing the second network device at the first frequency band; and employing the transmission power to transmit a random access message to the second network device by means of the first frequency band. The technical solution enables a terminal device to determine highly accurate transmission power in a random access process, thereby preventing wasteful use of transmission power or an increase in time delay for the terminal device.

Description

Random access method, device, system and storage medium

This application requires the priority of the Chinese patent application submitted to the State Intellectual Property Office of China on December 29, 2018, with the application number 201811647375.1 and the invention titled "Random Access Method, Device, System, and Storage Medium", all of which are approved by The reference is incorporated in this application.

Technical field

The present application relates to the field of communication technology, and in particular, to a random access method, device, system, and storage medium.

Background technique

The new uplink (NR) communication system introduces supplemental uplink (Supplementary Uplink, SUL) technology to solve the problem of insufficient uplink coverage caused by the use of higher frequency bands by the NR communication system. That is, in the NR communication system, when the terminal device is far away from the base station, it can use the lower frequency band SUL frequency band for random access; when the terminal device is closer to the base station, it can use the normal uplink with a higher frequency band (Normal Uplink, NUL) bands are randomly accessed.

In the prior art, when a terminal device selects to use SUL for random access, it performs a random access process according to SUL related parameters configured by the network device in the NR communication system. Specifically, the terminal device calculates the transmission power of the random access according to the power control parameter configured for the network device and the downlink signal power measured from the downlink (NR) of the NR communication system.

However, in the prior art, because each terminal device is in a different environment, the same power control parameter configured by the network device for all terminal devices in its serving cell cannot match the actual situation of each terminal device, resulting in the transmission of the terminal device Increased power waste or delay.

Summary of the invention

Embodiments of the present application provide a random access method, device, system, and storage medium to solve the problem of wasted transmission power or increased delay of terminal equipment.

A first aspect of the embodiments of the present application provides a random access method, which is applicable to a terminal device. The method includes:

Acquiring the downlink signal received power of the first network device in the first frequency band, where the first frequency band is the downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device;

Determine the actual downlink path loss of the first frequency band according to the received power of the downlink signal;

Determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss;

Sending a random access message to the second network device through the first frequency band using the transmit power.

In this embodiment, the terminal device obtains the downlink signal reception power of the first network device in the first frequency band, determines the actual downlink path loss of the first frequency band according to the downlink signal reception power, and then determines the random access in the first frequency band The transmission power of the second network device, therefore, the transmission power of the random access process determined by the terminal device is relatively accurate. The terminal device uses the transmission power to send a random access message to the second network device through the first frequency band to avoid the terminal device’s The problem of wasted transmission power or increased delay improves the performance of terminal equipment during random access.

Optionally, in a possible implementation manner of the first aspect, before the determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, The method also includes:

Receiving a first power control parameter sent by the first network device when performing random access in the first frequency band.

Correspondingly, the determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss includes:

According to the actual downlink path loss and the first power control parameter, determine the transmit power when randomly accessing the second network device in the first frequency band.

In this embodiment, the terminal device determines the random access in the first frequency band according to the first power control parameter received from the first network device when performing random access in the first frequency band and the determined actual downlink path loss The transmission power of the second network device is high in accuracy, which reduces the power consumption or access delay of the terminal device during the random access process, and solves the high power consumption or access delay of the terminal device existing in the prior art The big problem.

Optionally, in another possible implementation manner of the first aspect, before the determining the transmit power when randomly accessing the second network device on the first frequency band according to the actual downlink path loss , The method further includes:

Receiving a second power control parameter sent by a second network device when performing random access in a second frequency band, where the second frequency band is a normal uplink NUL frequency band of the second network device.

Correspondingly, the determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss includes:

According to the actual downlink path loss and the second power control parameter, determine the transmit power when randomly accessing the second network device in the first frequency band.

In this embodiment, the terminal device determines the random access in the first frequency band according to the second power control parameter received from the second network device when performing random access in the second frequency band and the determined actual downlink path loss The transmission power of the second network device is high in accuracy, which reduces the power consumption or access delay of the terminal device in the random access process, and solves the power of the terminal device in the prior art during the random access process The problem of high consumption or large access delay.

Optionally, in yet another possible implementation manner of the first aspect, the random access message includes: a random access pilot and a random access message 3, and the transmission power includes: a transmission power of a random access pilot, Random access message 3 transmit power.

Optionally, in another possible implementation manner of the first aspect, the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located in a new Air interface NR communication system.

A second aspect of the embodiments of the present application provides a random access device, which is suitable for terminal equipment. The device includes: an acquisition module, a processing module, and a sending module;

The acquiring module is used to acquire the downlink signal received power of the first network device in the first frequency band, the first frequency band is the downlink frequency band of the first network device, but is a supplementary uplink of the second network device Road SUL frequency band;

The processing module is configured to determine the actual downlink path loss of the first frequency band according to the received power of the downlink signal, and determine the random access to the first frequency band on the first frequency band according to the actual downlink path loss 2. The transmission power of network equipment;

The sending module is configured to send the random access message to the second network device through the first frequency band using the transmit power.

Optionally, in a possible implementation manner of the second aspect, the apparatus further includes: a receiving module;

The receiving module is configured to receive the first network device before the processing module determines the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss The first power control parameter sent when random access is performed in the first frequency band.

Correspondingly, the processing module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, specifically:

The processing module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the actual downlink path loss and the first power control parameter.

Optionally, in another possible implementation manner of the second aspect, the apparatus further includes: a receiving module;

The receiving module is configured to receive the data sent by the second network device before the processing module determines the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss A second power control parameter when performing random access in a second frequency band, where the second frequency band is a normal uplink NUL frequency band of the second network device.

Correspondingly, the processing module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, specifically:

The processing module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss and the second power control parameter.

Optionally, in yet another possible implementation manner of the second aspect, the random access message includes: a random access pilot and a random access message 3, and the transmission power includes: a transmission power of a random access pilot, Random access message 3 transmit power.

Optionally, in another possible implementation manner of the second aspect, the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located in a new Air interface NR communication system.

A third aspect of the embodiments of the present application provides a random access device, which is suitable for terminal equipment. The device includes: a first module and a second module;

The first module is used to obtain the downlink signal received power of the first network device in the first frequency band, determine the actual downlink path loss of the first frequency band according to the downlink signal received power, and convert the actual downlink path Loss transmission to the second module, the first frequency band is a downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device;

The second module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the received actual downlink path loss, and use the transmit power to pass through the first frequency band Sending a random access message to the second network device.

In a possible implementation manner of the third aspect, the first module is further configured to receive the first power control parameter sent by the first network device when performing random access in the first frequency band, and Sending the first power control parameter to the second module;

The second module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss, specifically:

The second module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss and the first power control parameter.

In another possible implementation manner of the third aspect, the second module is further configured to determine when randomly accessing the second network device in the first frequency band according to the actual downlink path loss Before transmitting power, receiving a second power control parameter sent by a second network device when performing random access in a second frequency band, where the second frequency band is a normal uplink NUL frequency band of the second network device;

The second module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss, specifically:

The second module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the received actual downlink path loss and the second power control parameter.

In yet another possible implementation manner of the third aspect, the random access message includes: a random access pilot and a random access message 3, and the transmission power includes: a transmission power of a random access pilot, a random access message 3 transmit power.

In any of the foregoing possible implementation manners of the third aspect, the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located in a new air interface NR communication In the system, the first module is an LTE module, and the second module is an NR module.

A fourth aspect of an embodiment of the present application provides a random access device, including a processor, a memory, and a computer program stored on the memory and executable on the processor. The processor executes the program as described above The method described in the first aspect and various possible designs of the first aspect.

A fifth aspect of an embodiment of the present application provides a terminal device, including at least one processing element (or chip) for performing the method of the first aspect above.

A sixth aspect of an embodiment of the present application provides a storage medium that stores instructions, and when the instructions run on a computer, the computer is caused to execute the first aspect and various possible designs of the first aspect. The method.

A seventh aspect of the embodiments of the present application provides a computer program product containing instructions that, when run on a computer, cause the computer to execute the method described in the first aspect and various possible designs of the first aspect.

An eighth aspect of an embodiment of the present application provides a communication system, including: a terminal device, a first network device, and a second network device;

The terminal device communicates with the first network device on the first frequency band, communicates with the second network device on the second frequency band, or sends an uplink signal to the second network device on the first frequency band.

The first frequency band is a downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device, and the second frequency band is a normal uplink of the second network device Road NUL;

The terminal device is the random access device of the second aspect or the terminal device of the third aspect or the fourth aspect.

The random access method, device, system, and storage medium provided by the embodiments of the present application obtain the downlink signal reception power of the first network device in the first frequency band, which is the downlink frequency band of the first network device , But it is a supplementary uplink SUL frequency band for the second network device, and secondly determines the actual downlink path loss of the first frequency band based on the received power of the downlink signal, and then determines the transmission when randomly accessing the second network device in the first frequency band Power, and finally use the transmit power to send a random access message to the second network device through the first frequency band. In this technical solution, the transmission power of the random access process determined by the terminal device has high accuracy, so as to avoid the problem of wasted transmission power or increased delay of the terminal device.

BRIEF DESCRIPTION

1 is a schematic structural diagram of a communication system provided by an embodiment of the present application;

2 is a schematic diagram of frequency bands used by uplink and downlink of terminal equipment when the NR system and the LTE system are co-located;

Figure 3 shows the general flow diagram of the random access process;

4 is a schematic flowchart of Embodiment 1 of a random access method provided by an embodiment of this application;

5A and 5B are schematic diagrams of the positional relationship between the first module and the second module in the terminal device;

6 is a schematic flowchart of Embodiment 2 of a random access method provided by an embodiment of this application;

7 is a schematic flowchart of Embodiment 3 of a random access method provided by an embodiment of this application;

8 is a schematic structural diagram of Embodiment 1 of a random access device provided by an embodiment of this application;

9 is a schematic structural diagram of Embodiment 2 of a random access device provided by an embodiment of this application;

10 is a schematic structural diagram of Embodiment 3 of a random access device provided by an embodiment of this application;

11 shows a simplified schematic diagram of a possible design structure of the terminal device involved in the foregoing embodiment;

12 is a schematic structural diagram of an embodiment of a communication system provided by an embodiment of the present application.

detailed description

The random access method provided by the following embodiments of the present application can be applied to a communication system. FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application. As shown in FIG. 1, the communication system may include at least one network device 10 and multiple terminal devices located within the coverage of the network device 10. FIG. 1 exemplarily shows a network device and terminal devices 11 to 16. In the communication system of the embodiment shown in FIG. 1, the network device 10 as a sender may send information to one or several terminal devices from the terminal device 11 to the terminal device 16. Optionally, in the embodiment shown in FIG. 1, the terminal device 14 to the terminal device 16 may also form a communication system. In the communication system, the terminal device 15 as a sender may send the terminal device 14 and the terminal device 16 One or more terminal devices in the server send information. Optionally, the communication system is not limited to include network devices and terminal devices, as long as there are entities that send information and entities that receive information in the communication system, this embodiment of the present application does not limit this.

Optionally, the communication system may further include other network entities such as a network controller, a mobility management entity, etc. The embodiments of the present application are not limited thereto.

The communication system applied in the embodiments of the present application may be a global mobile communication (global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (wideband code division multiple access) , WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (LTE) system, advanced long term evolution (LTE advanced, LTE-A), LTE frequency division duplex (frequency division division) duplex, FDD) system, LTE time division duplex (TDD), universal mobile communication system (universal mobile telecommunication system, UMTS), and other applications using orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) technology Wireless communication system, etc. The system architecture and business scenarios described in the embodiments of the present application are to more clearly explain the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. With the evolution of the architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

The network device involved in the embodiments of the present application may be used to provide a wireless communication function for a terminal device, that is, the network device may be an entity on the network side used to send or receive signals. From the perspective of product form, network equipment is a device with central control function, which can include various forms of macro base stations, micro base stations, hot spots (pico), home base stations (Femeto), transmission points (TP), relay (Relay) , Access points (access points, AP), etc. In different communication modes, the network device may have different names. For example, the network device may be a base station (BTS) in GSM or CDMA, or a base station (nodeB, NB) in WCDMA It may also be an evolutionary base station (evolutional node B, eNB or e-NodeB) in LTE, and may be a corresponding device gNB in a 5G network. For convenience of description, in all the embodiments of the present application, the above-mentioned apparatuses that provide wireless communication functions for terminal devices are collectively referred to as network devices.

In the embodiment of the present application, the terminal device may be any terminal, for example, the terminal device may be a user device of machine type communication. The terminal device is a device that can receive the scheduling and instruction information of the network device. The terminal device can also be called user equipment (UE), for example, mobile phones, computers, bracelets, smart watches, data cards, sensors, and stations (Station , STA) and other devices, that is to say, the terminal device can also be called a mobile station (MS), mobile terminal (mobile terminal), terminal (terminal), etc., the terminal device can be accessed via a wireless network (radio access network, RAN) communicates with one or more core networks, for example, the terminal device may be a mobile phone (or called a "cellular" phone), a computer with a mobile terminal, etc. For example, the terminal device may also be portable , Portable, handheld, computer built-in or vehicle-mounted mobile devices that exchange language and/or data with the wireless access network. There is no specific limitation in the embodiments of the present application.

It is worth noting that for sidelink (D2D), for example, the bracelet-mobile phone constitutes the link between the bracelet and the mobile phone in the communication system, where the bracelet can be regarded as a terminal device, and the mobile phone is regarded as a network equipment.

In the embodiments of the present application, "multiple" refers to two or more than two. "And/or" describes the relationship of the related objects, indicating that there can be three relationships, for example, A and/or B, which can indicate: there are three cases of A alone, A and B, and B alone. The character "/" generally indicates that the related object is a "or" relationship.

The following first briefly describes the applicable scenarios of the embodiments of the present application.

In existing cellular communication systems, such as GSM, WCDMA, LTE, etc., the communications supported are mainly for voice and data communications. Generally speaking, a network device (for example, a base station) supports a limited number of connections. It should be noted that in LTE, the base station can be called a 4G base station (eNodeB, eNB), and in the next-generation 5G mobile communication system (that is, new radio (NR)), the base station can be called a 5G base station (gNodeB , GNB).

Compared with the LTE system, a variety of new features have been introduced in the NR system, including uplink and downlink decoupling, including supplementary uplink (SUL) technology. The so-called SUL is to decouple the relationship between the frequency bands used in the uplink and downlink of the NR system, that is, to allow the uplink (uplink, UL) to configure a lower frequency band than the downlink to solve or improve the uplink coverage of the terminal equipment. Problem.

For example, FIG. 2 is a schematic diagram of frequency bands used by the uplink and downlink of terminal equipment when the NR system and the LTE system are co-located. As shown in FIG. 1, the NR system and the LTE system are co-located, that is, the first network device 21 included in the NR system and the second network device 22 included in the LTE system are distributed at the same or similar locations. Exemplarily, as shown in FIG. 1, in this embodiment, it is assumed that the NR system includes: a first network device 21, a terminal device 23, and a terminal device 24, and the LTE system includes a second network device 22, a terminal device 23, that is, a terminal The device 23 belongs to both the range of the NR system and the range of the LTE system. The terminal device 23 can use the frequency band range of the LTE system for uplink and downlink transmission, and can also use the frequency band range of the NR system for uplink and downlink transmission.

In this embodiment, it is assumed that the NR system uses a higher frequency band F1 (such as 3.5GHz, labeled 3.5GHz@F1) than the LTE system for uplink and downlink transmission, and the LTE system uses the frequency band F2 (such as 1.8GHz, labeled 1.8GHz@ F2) Perform uplink and downlink transmission. In the NR system, the uplink used by the NR system may be called a normal uplink (NUL), or non-SUL, etc., and the downlink used by the NR system is called an NR downlink (DLlink) link. road.

Normally, comparing with the maximum downlink transmit power of gNB (such as 43dBm), the maximum transmit power of the terminal equipment is relatively limited (such as 23dBm or 26dBm), which will lead to coverage when the uplink or downlink transmission of the NR system uses the same or adjacent frequency The area is not equal, that is, the NR uplink coverage is much smaller than the NR downlink coverage. In this case, the uplink coverage of the NR system can only reach hundreds of meters, which will require the NR network to be deployed more densely, which may greatly enhance the operator’s Cost of deployment.

In response to this problem, the SUL feature was introduced in the NR system, that is, to configure a lower frequency band F2 for the uplink of the NR system (for example, the frequency band of the LTE system is 1.8 GHz, labeled 1.8 GHz@F2) The problem of insufficient uplink coverage at high frequencies. It is worth noting that, after practical verification, the uplink of the NR system can use the F2 band (1.8GHz, or SUL), and its coverage is twice that of the F1 band (3.5GHz, or NUL), that is, after using SUL The uplink coverage of the NR system can be extended to more than 1km. Therefore, the SUL feature helps operators to provide continuous coverage, enhance the mobile experience of terminal devices, and reduce network deployment costs.

It can be understood that SUL may also be other frequency bands, such as 800 MHz, and NUL may also be other frequency bands, such as 28 GHz, and the NUL frequency is higher than the frequency of SUL. For ease of description, in the embodiments of the present application, the NUL is 3.5 GHz and the SUL is 1.8 GHz as an example for description. It can be understood that NUL and SUL can also use other frequency bands, as long as the NUL frequency is higher than the SUL frequency.

Exemplarily, the network device may broadcast the random access resource configuration, that is, the power control parameter of the random access process, through a system message.

In this embodiment, for a terminal device in a 5G NR system, according to the 5G NR standard protocol, the terminal device obtains downlink synchronization by detecting a synchronization signal (synchronization signal block, SSB), and obtains a random connection using NUL by receiving a system message. Random access (RA) resource configuration, power control parameters, etc. at the time of entry; if the terminal device can use SUL for random access, the base station will also configure SUL related parameters for the terminal device through system messages, including SUL/NUL Select threshold parameters (for example, SUL-band reference signal received power threshold sul-RSRP-Threshold), random access resource configuration on SUL, power control parameters, etc. The power control parameters include RA preamble power control parameters, physical uplink shared channel (physical uplink shared channel, PUSCH) power control parameters, and physical uplink control channel (physical uplink control channel, PUCCH) power control parameters.

Optionally, RA preamble power control parameters, PUSCH power control parameters, and PUCCH power control parameters on the NUL frequency band and the SUL frequency band are independently configured. When the terminal equipment performs random access, it will first measure the received downlink reference signal received power (DLlink RSRP) on the NR DL link and the SUL/NUL selection threshold parameter (sul- RSRP-Threshold) for comparison. The physical significance of the SUL/NUL selection threshold parameter (sul-RSRP-Threshold) is to help the terminal device determine whether to select NUL or SUL for random access. If DL RSRP<sul-RSRP-Threshold, the terminal device selects SUL for random access, usually In other words, the terminal device may be far away from gNB or the channel quality is poor; if DL RSRP>=sul-RSRP-Threshold, the terminal device selects NUL for random access, that is to say, the terminal device may be closer to gNB at this time Near or channel quality is better. In addition, gNB can also control the number of terminal devices connected to NUL/SUL by adjusting the size of sul-RSRP-Threshold.

Figure 3 shows the general flow diagram of the random access process. As shown in FIG. 3, the terminal device performs information interaction with the base station, where message 1 (Msg1) and message 3 (Msg3) are uplink UL messages sent by the terminal device, and are called random access messages. In this embodiment, Msg1 is a random access preamble. Message 2 (Msg2) and Message 4 (Msg4) are the response messages of the base station, which are the same as those in the prior art, and will not be repeated in this embodiment.

When the terminal device in the NR system chooses to perform random access through the SUL link, the terminal device first calculates the NR downlink (NR) path loss based on the DL RSRP measured from the NR DL link, and then The power control parameters of the SUL link configured by the base station and the transmission power of Msg1 and Msg3 during the random access calculation of the path loss.

Specifically, Msg1 is sent on a physical random access channel (PRACH). Optionally, the transmission power P _{PRACH, SUL of} the Msg1 is determined by the following formula (1):

P _PRACH,SUL =min{P _CMAX ,P _PRACH,target +PL _{NR DL} } (1)

Among them, P _CMAX is the maximum transmission power of the terminal device, P _{PRACH, target} is the target received power on the PRACH configured by the base station, and PL _{NR DL} is the NR downlink path loss calculated by the terminal device.

Msg3 is sent on the PUSCH. Therefore, the transmission power P _{PUSCH, SUL of} the Msg3 can be determined by the following formula (2):

Among them, P _{O, PUSCH} represents the target received power on the PUSCH configured by the base station, μ is related to the subcarrier interval of the resource used to send the message on the PUSCH, M represents the number of resource blocks used to send Msg3 on the PUSCH, for example, 2 ^μ *15 is recorded as the subcarrier interval in units of 15 kHz; α is the NR downlink path loss factor, PL _{NR DL} is the NR downlink path loss measured by the terminal equipment, Δ and PUSCH modulation and coding scheme (modulation and coding scheme (MCS), the higher the specific MCS, the greater the Δ, because higher-order MCS requires higher received power; f is related to dynamic power control, which is the network equipment instructs the terminal equipment in scheduling signaling The power of the second transmission is adjusted up/down by one value compared to the previous transmission, and f is used to reflect this dynamically adjusted power. P _O,PUSCH , μ, M, α, Δ, f are all configured by the base station or determined by the base station configuration other parameters, and α of Msg3 is usually taken as 1, f is usually taken as 0, only PL _{NR DL} requires terminal equipment Obtained by measurement and calculation.

It is worth noting that the specific values of PL _{NR DL} in formula (1) and formula (3) may be inconsistent, which are the road loss values measured in real time in the scenario where the terminal device is located.

In practical applications, since the path loss in formula (1) and formula (2) both use the path loss of the NR DL link (3.5 GHz), Msg1 and Msg3 are sent on the SUL link (1.8 GHz). There is a big difference in the path loss between 1.8GHz and 3.5GHz links, which will lead to inaccurate power control of Msg1 and Msg3. To solve this problem, P _{PRACH, target} and P _{O, PUSCH} include the path loss difference between the 3.5 GHz link and the 1.8 GHz link.

Specifically, in formula (1), P _PRACH,target =P _{PRACH,target,real} -ΔPL.

Among them, P _{PRACH, target, real} is the actual target received power of the base station for random access on the SUL link, and ΔPL is the path loss difference between the 3.5 GHz and 1.8 GHz links. The terminal device may estimate ΔPL according to the uplink signal measurement results of the terminal device on NUL and SUL. Since the SUL link is only used for UL, that is, there is no downlink reference signal in the SUL frequency band, the terminal device cannot obtain the path loss difference ΔPL by measuring the road calculation of the two frequency bands.

Similarly, in formula (2), P _O,PUSCH =P _O,PUSCH,real -ΔPL.

Among them, P _{O, PUSCH, and real} are the actual target received power of the base station on the PUSCH for the SUL link.

In this way, the terminal device can correctly determine the transmission power of Msg1 and Msg3 according to formulas (1) and (2).

However, for the random access process, P _{PRACH, target in} formula (1) and P _{O, PUSCH} in formula (2) are cell-level power control parameters, that is, the base station configures the same target for all terminal devices in the current cell Receiving power parameter. Correspondingly, each terminal device uses the same target receiving power parameter to determine the transmission power of Msg1 or Msg3 during the random access process. P _{O,PUSCH is} composed of the nominal power of the cell and the nominal power of the terminal equipment. Each terminal equipment itself has different configuration parameters, but for Msg3, the nominal power of the terminal equipment is 0, so the P _{O of} Msg3 _{, PUSCH} only includes the nominal power of the cell, which is actually a cell-level power control parameter.

Due to the different peripheral environments of different terminal devices, the path loss difference between the 3.5GHz link and the 1.8GHz link of different terminal devices is different, which in turn makes the P _{PRACH, target} and P _{O, PUSCH of} different terminal devices different, while the base station It is impossible to configure the above target received power applicable to all terminal devices. This results in that after the base station is configured with P _{PRACH, target} and P _{O, PUSCH} , some terminal devices calculate the Msg1/Msg3 transmission power based on them greater than the actual required power, resulting in increased power consumption of the terminal device; some terminal devices Based on their calculated Msg1/Msg3 transmission power is less than the actual required power, the terminal device needs to send Msg1/Msg3 multiple times to be successfully received by the base station, multiple transmissions also cause UE power consumption to increase, and introduce additional delay.

Therefore, in the 5G NR uplink and downlink decoupling (SUL) scenario, when the terminal equipment performs random access on the SUL, since the power control parameters of Msg1 and Msg3 are cell-level parameters, they cannot fully match the actual conditions of each terminal equipment. In this situation, the power consumption of the terminal device increases, and delay may be caused.

To solve this problem, an embodiment of the present application proposes a random access method. The terminal device first obtains the downlink signal received power of the first network device in a first frequency band, where the first frequency band is the downlink of the first network device Frequency band, but as a supplementary uplink SUL frequency band for the second network device, secondly, based on the received power of the downlink signal, the actual downlink path loss in the first frequency band is determined, and then when the second network device is randomly accessed in the first frequency band Transmit power, and finally use the transmit power to send a random access message to the second network device. This technical solution can enable the terminal device to accurately determine the transmission power of the random access process, and avoid the problem of wasted transmission power or increased delay of the terminal device.

The technical solution of the present application will be described in detail below through specific embodiments. It should be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

4 is a schematic flowchart of Embodiment 1 of a random access method provided by an embodiment of this application. This method is suitable for terminal equipment. As shown in FIG. 4, in this embodiment, the random access method may include the following steps:

Step 41: Obtain the downlink signal received power of the first network device in the first frequency band.

Wherein, the first frequency band is a downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device.

Exemplarily, the first network device is an LTE base station, and the second network device is a 5G NR base station. The premise of the embodiments of the present application is that the network side is deployed in a non-standalone (NSA) mode, and the base station of the LTE system Co-located with the base station of 5G NR system. In this way, the downlink of the LTE system and the supplementary uplink SUL of the NR system are the same link, and the actual downlink path loss calculated by the terminal device using the received power of the downlink signal received from the first network device can be used for the first Power control of frequency band links.

The embodiment of the present application is applicable to the scenario when the NR system and the LTE system shown in FIG. 2 are distributed together, and the terminal device applicable to the method may be the terminal device 23 in the scenario described in FIG. 2. That is, in this embodiment, the terminal device and the first network device are located in the LTE communication system, and the terminal device and the second network device are located in the NR communication system.

Generally, in this embodiment, for the terminal devices located in the LTE communication system and the NR communication system, it can send and receive information with the first network device in the LTE communication system in the first frequency band, or it can be in the second Send and receive information with the second network device in the NR communication system on the frequency band.

Exemplarily, in the LTE communication system, the first frequency band is a communication link between the terminal device and the first network device. Specifically, for the LTE FDD system, the first frequency band may be a downlink frequency band; for the LTE TDD system, the first frequency band may be an uplink frequency band or a downlink frequency band.

In the NR communication system, the first frequency band may be a supplementary uplink for communication between the terminal device and the second network device. The second frequency band is the normal uplink and downlink frequency band for communication between the terminal device and the second network device.

Therefore, in this embodiment, the terminal device may receive the downlink signal sent by the first network device in the first frequency band, so as to obtain the received power of the downlink signal, that is, the received power of the downlink signal.

It is worth noting that the downlink signal in the first frequency band is usually a downlink reference signal, for example, a synchronization signal (synchronization signal, SS) or a cell-specific reference signal (CRS). The embodiments of the present application do not limit the specific form of the downlink signal, which can be determined according to actual conditions.

Exemplarily, in this embodiment, the terminal device may include: a first module and a second module. The first module (for example, the LTE module) is used to communicate with the first network device, for example, to receive the downlink signal sent by the first network device in the first frequency band or send the uplink signal to the first network device in the first frequency band Signals, etc.; the second module (for example, 5G NR module) is used to communicate with the second network device, for example, to receive the downlink signal sent by the second network device in the second frequency band or in the first frequency band and/or the second frequency band The uplink signal is sent to the second network device.

Step 42: Determine the actual downlink path loss of the first frequency band according to the received power of the downlink signal.

Optionally, in this embodiment, after the first module of the terminal device obtains the downlink signal received power in the first frequency band according to the received downlink signal, it may be based on the downlink signal received power and the downlink of the first network device The signal transmission power determines the actual downlink path loss in the first frequency band.

Exemplarily, in this embodiment, the first module of the terminal device may be a pre-5G module, for example, may be an LTE module. The second module may be a 5G NR module. Assuming that the first frequency band is 1.8 GHz (LTE frequency band, for the 5G NR system, SUL frequency band), the terminal device first receives the LTE downlink reference signal of the first network device through the first module, that is, the LTE module, and measures 1.8 GHz The actual downlink path loss of the frequency band is recorded as PL _SUL .

Assuming that the terminal device measures the received power of the downlink reference signal in the first frequency band as PR _{, RS} through the first module _, and the transmit power of the downlink reference signal transmitted by the first network device is P _{T, RS} , then PL _SUL = P _{T, RS} -PR _,RS . Among them, P _T,RS may be notified by the first network device to the terminal device, for example, through system message configuration; P _T,RS may also be calculated by the terminal device according to a predefined rule. For example, if the total transmission power of the first network device is P, the system bandwidth is W, and the subcarrier spacing is ΔW, then

Wherein, P may be predefined (for example, P=43dBm) or notified by the first network device (such as through a system message) to the terminal device, and W may be notified by the first network device (such as through a system message) to the terminal device, ΔW It may be predefined (for example, ΔW=15kHz) or notified by the first network device (for example, through a system message) to the terminal device.

Step 43: Determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss.

Optionally, in this embodiment, in the scenario of uplink and downlink decoupling, assuming that the terminal device selects to access the network through the first frequency band, the first module of the terminal device (for example, the LTE module) determines that the first frequency band After the actual downlink path loss PL _SUL , the actual downlink path loss PL _SUL can be transmitted to the second module, that is, the 5G NR module, so that the second module can determine to perform random access on the first frequency band according to the PL _SUL . Transmit power P _{SUL for} network equipment.

Optionally, in this embodiment, as can be seen from the above, the terminal device sends a random access message to the network device during the random access process. The random access message includes: two messages, namely message 1 (Msg1) and Message 3 (Msg3), where the message 1 (Msg1) is also a random access preamble, and the message 3 (Msg3) is also called a random access message 3, so, in this embodiment, the determined transmission power includes the above The transmission power corresponding to the two messages respectively, that is, the transmission power includes: the transmission power of the random access pilot, and the transmission power of the random access message 3. Of course, this solution can also be used only for determining the transmission power of one message in Msg1 and Msg3.

Step 44: Use the above transmit power to send a random access message to the second network device through the first frequency band.

Exemplarily, in this embodiment, after the second module of the terminal device determines the transmit power when randomly accessing the second network device in the first frequency band, it may send the random access message in the first frequency band, The random access message may be Msg1 or Msg3. That is, the terminal device uses the transmit power to send a random access message to the second network device on the first frequency band through the second module.

It is worth noting that FIGS. 5A and 5B are schematic diagrams of the positional relationship between the first module and the second module in the terminal device. Optionally, as an implementation manner, in actual implementation, the first module and the second module in the terminal device may use different antennas, as shown in FIG. 5A; optionally, as another implementation manner, the terminal The first module and the second module in the device may also use the same antenna, as shown in FIG. 5B.

The embodiment of the present application does not limit the style of the antenna used by the first module and the second module, which can be determined according to actual conditions.

The random access method provided in the embodiment of the present application obtains the downlink signal reception power of the first network device in the first frequency band, which is the downlink frequency band of the first network device but the second network device Supplementary uplink SUL frequency band, secondly determine the actual downlink path loss of the first frequency band based on the received power of the downlink signal, and then determine the transmission power when randomly accessing the second network device in the first frequency band, and finally adopt the transmission power Send a random access message to the second network device through the first frequency band. This technical solution can enable the terminal device to accurately determine the transmission power of the random access process, and avoid the problem of wasted transmission power or increased delay of the terminal device.

Exemplarily, on the basis of the foregoing embodiment, FIG. 6 is a schematic flowchart of Embodiment 2 of a random access method provided by an embodiment of this application. As shown in FIG. 6, before step 43 (based on the actual downlink path loss, determining the transmit power when randomly accessing the second network device in the first frequency band), the method may further include the following steps:

Step 61: Receive the first power control parameter sent by the first network device when performing random access in the first frequency band.

In this embodiment, for a communication system composed of a terminal device and a first network device, the first network device configures the terminal device with random access resources and power control parameters when performing random access in the first frequency band, specifically, The first network device may configure the terminal device through a system message.

Exemplarily, in this embodiment, if the terminal device in the NR communication system wants to access the second network device in the first frequency band, the terminal device first needs to receive the first use configured by the first network device for the terminal device. A power control parameter when performing random access in a frequency band. In this embodiment, the power control parameter configured by the first network device for the terminal device is called a first power control parameter.

It is worth noting that the first module of the terminal device receives the first power control parameter and transmits it to the second module of the terminal device, so that the second module determines the access to the second network device through the first frequency band Random access message transmission power.

Correspondingly, as shown in FIG. 6, the above step 43 (determining the transmit power when randomly accessing the second network device in the first frequency band based on the actual downlink path loss) can be achieved by the following steps:

Step 62: Determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss and the first power control parameter.

Exemplarily, in this embodiment, both the actual downlink path loss and the first power control parameter may be determined and/or received by the first module of the terminal device, and the first module of the terminal device may be based on the acquired downlink signal The received power determines the actual downlink path loss in the first frequency band and receives the first power control parameter sent by the first network device when performing random access in the first frequency band, and transmits it to the second module.

It can be understood that the first module may transmit and obtain the actual downlink path loss and the received first power control parameter separately or together. The embodiment of the present application does not limit the transmission mode, which may be determined according to actual conditions.

Exemplarily, the second module may calculate the transmit power when randomly accessing the second network device in the first frequency band based on the actual downlink path loss and the first power control parameter.

Specifically, for the above message 1, Msg1, also known as a random access pilot, the second module (5G NR module) determines the transmission power of message 1 by the following formula (3):

P _PRACH,SUL =min{P _CMAX ,P _{PRACH,target,real} +PL _SUL } (3)

Among them, similar to the above formula (1), the P _CMAX is the maximum transmission power of the terminal equipment.

The difference is that the P _{PRACH, target, real} is the actual target received power of the first network device on the PRACH when the terminal device and the first network device communicate using the first frequency band, not the target of the first network device on the PRACH Receive power. In this embodiment, P _{PRACH, target, real} in formula (3) is a target received power in the foregoing first power control parameter.

As an example, if the first module is an LTE module, P _{PRACH, target, real is} actually PRACH target reception of the first frequency band (for example, 1.8 GHz frequency band) configured by the first network device in the LTE system through system messages power.

The actual downlink path loss PL _SUL in the first frequency band is the actual value in the first frequency band calculated by the second module of the terminal device based on the received power of the downlink signal (sent by the first network device) obtained in the first frequency band Downlink loss, not the second module of the terminal device calculates the path on the downlink in the second frequency band based on the received power of the downlink signal (sent by the second network device) measured on the downlink in the second frequency band Therefore, the transmission power of message 1 determined by the technical solution of this embodiment is relatively accurate.

For the above message 3, Msg3, also known as random access message 3, the second module (5G NR module) determines the transmit power of message 3 by the following formula (4):

The transmission power of Msg3 is similar to that of Msg1. Specifically, the P _CMAX is the maximum transmission power of the terminal equipment. The difference is that the target received power P _O,PUSCH,real is the actual target received power of the second network device on the PUSCH when the terminal device and the second network device communicate using the first frequency band, not the configuration of the second network device. The target received power on PUSCH. In this embodiment, P _{O, PUSCH, and real} in formula (4) are the target received power in the foregoing first power control parameter.

As an example, if the first module is an LTE module, P _{O, PUSCH, and real are} actually PUSCH target received power in the first frequency band (for example, 1.8 GHz frequency band) configured by the first network device in the LTE system through system messages.

The actual downlink path loss PL _SUL in the first frequency band is consistent with that in formula (3), and will not be repeated here.

It is worth noting that, μ, M, α, Δ, and f in formula (4) are the same as those in formula (2) above, and will not be repeated here.

In the random access method provided by the embodiment of the present application, before determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, the terminal device also receives the The first power control parameter when performing random access in the frequency band, and then, according to the actual downlink path loss and the first power control parameter, determine the transmit power when randomly accessing the second network device in the first frequency band. In this technical solution, the transmission power determined by the terminal device based on the first power control parameter sent by the first network device has high accuracy, reduces the power consumption or access delay of the terminal device during the random access process, and solves the existing problem The technology has the problems of high power consumption of terminal equipment or large access delay.

Exemplarily, on the basis of the foregoing embodiment, FIG. 7 is a schematic flowchart of Embodiment 3 of a random access method provided by an embodiment of this application. As shown in FIG. 7, before the above step 43 (determining the transmission power when randomly accessing the second network device in the first frequency band based on the actual downlink path loss), the method may further include the following steps:

Step 71: Receive the second power control parameter sent by the second network device when performing random access in the second frequency band.

The second frequency band is a normal uplink NUL frequency band of the second network device.

In this embodiment, for a communication system composed of a terminal device and a second network device, the second network device configures the terminal device with random access resources and power control parameters when performing random access in the second frequency band, specifically, The second network device may configure the terminal device through a system message.

Exemplarily, in this embodiment, if the terminal device in the NR communication system wants to access the second network device in the first frequency band, the terminal device may first receive the second network device configured for the terminal device to use the second A power control parameter when performing random access in a frequency band. In this embodiment, the power control parameter configured by the second network device for the terminal device is called a second power control parameter.

It is worth noting that the second power control parameter includes: when the terminal device uses the second frequency band, the target received power of the second network device.

Correspondingly, as shown in FIG. 7, the above step 43 (determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss) can be achieved by the following steps:

Step 72: Determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss and the second power control parameter.

Exemplarily, in this embodiment, the actual downlink path loss is determined by the first module of the terminal device, and the first module of the terminal device determines the actual downlink path loss of the first frequency band and then transmits it to the second Module.

In this way, the second module can calculate the transmit power when randomly accessing the second network device in the first frequency band based on the received actual downlink path loss and the second power control parameter received from the network device.

Optionally, in this embodiment, for the above message 1, the second module (5G NR module) still determines the transmit power of the message 1 through the above formula (3). The difference between this embodiment and the above embodiment is only that: P _{PRACH, target, real} in formula (3) is the target received power on the PRACH when the second network device configures the terminal device for random access using the second frequency band. That is, the terminal device receives the PRACH target received power configured by the second network device through the system message through the second module (such as a 5G NR module), and uses this value as P _{PRACH,target,real} . In this case, the terminal device uses the PRACH target received power in the second frequency band (eg, 3.5 GHz band) of the 5G NR system as its PRACH target received power in the first frequency band (eg, 1.8 GHz band). Therefore, the transmit power when the terminal device randomly accesses the second network device in the first frequency band can also be determined according to the formula (3). In this embodiment, P _{PRACH, target, real} in formula (3) is a target received power in the foregoing second power control parameter.

Optionally, in this embodiment, for the above message 3, the second module (5G NR module) still determines the transmit power of the message 3 through the above formula (4). The difference between this embodiment and the above-mentioned embodiment is only that: P _{O, PUSCH, and real} in formula (4) may be the target received power on the PUSCH when the second network device configures the terminal device for random access using the second frequency band . That is, the terminal device receives the target received power on the PUSCH configured by the second network device through the system message through the second module (such as a 5G NR module), and uses this value as P _O,PUSCH,real . In this case, the terminal device uses the PUSCH target received power in the second frequency band (eg, 3.5 GHz band) of the 5G NR system as its target PUSCH received power in the first frequency band (eg, 1.8 GHz band). In this embodiment, P _{O, PUSCH, and real} in formula (4) are the target received power in the foregoing second power control parameter.

According to the random access method provided in the embodiment of the present application, before determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, the terminal device also receives the second The second power control parameter when performing random access in the frequency band, which is the normal uplink NUL frequency band of the second network device, and is determined on the first frequency band according to the actual downlink path loss and the second power control parameter Transmit power when randomly accessing the second network device. In this technical solution, the terminal device can also accurately determine the transmission power in the first frequency band, which solves the problems of high power consumption or large access delay in the random access process of the terminal device existing in the prior art .

The following is an embodiment of the device of the present application, which can be used to execute the method embodiment of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

8 is a schematic structural diagram of Embodiment 1 of a random access device provided by an embodiment of this application. The device may be integrated in the terminal device, or may be implemented through the terminal device. As shown in FIG. 8, the apparatus may include: an acquisition module 81, a processing module 82, and a sending module 83.

Wherein, the obtaining module 81 is used to obtain the downlink signal received power of the first network device in the first frequency band, the first frequency band is the downlink frequency band of the first network device, but is complementary to the second network device Uplink SUL frequency band;

The processing module 82 is configured to determine the actual downlink path loss of the first frequency band according to the received power of the downlink signal, and determine the random access to the first frequency band on the first frequency band according to the actual downlink path loss 2. The transmission power of network equipment;

The sending module 83 is configured to use the transmit power to send a random access message to the second network device through the first frequency band.

Exemplarily, on the basis of the foregoing embodiment, FIG. 9 is a schematic structural diagram of Embodiment 2 of a random access device provided by an embodiment of this application. As shown in FIG. 9, the device may further include: a receiving module 91.

Exemplarily, in a possible design of this embodiment, the receiving module 91 is configured to determine, at the processing module 82, according to the actual downlink path loss, to randomly access the first Before the transmit power of the second network device, receive the first power control parameter sent by the first network device when performing random access in the first frequency band.

Correspondingly, the above processing module 82 is used to determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, specifically:

The processing module 82 is specifically configured to determine to randomly access the second network in the first frequency band based on the determined actual downlink path loss and the first power control parameter received by the receiving module 91 The transmit power of the device.

Exemplarily, in another possible design of this embodiment, the receiving module 91 is configured to determine that the processing module 82 randomly accesses the first frequency band according to the actual downlink path loss Before the transmit power of the second network device, receive the second power control parameter sent by the second network device when performing random access in the second frequency band, where the second frequency band is the normal uplink of the second network device NUL band.

Correspondingly, the above processing module 82 is used to determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, specifically:

The processing module 82 is specifically configured to determine random access to the second network in the first frequency band based on the determined actual downlink path loss and the second power control parameter received by the receiving module 91 The transmit power of the device.

Optionally, in any of the above embodiments of the present application, the random access message includes: a random access pilot and a random access message 3, and the transmission power includes: a transmission power of a random access pilot, a random access The transmit power of incoming message 3.

Optionally, in any of the above embodiments of the present application, the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located in a new air interface NR Communication system.

The random access device of this embodiment may be used to implement the implementation solutions of the method embodiments shown in FIG. 4 to FIG. 7. The specific implementation manner and technical effect are similar, and are not described here again.

10 is a schematic structural diagram of Embodiment 3 of a random access device according to an embodiment of this application. The device may be integrated in the terminal device, or may be implemented through the terminal device. As shown in FIG. 10, the device may include a first module 101 and a second module 102.

Wherein, the first module 101 is used to obtain the downlink signal received power of the first network device in the first frequency band, determine the actual downlink path loss of the first frequency band according to the downlink signal received power, and convert the actual The downlink path loss is transmitted to the second module 102.

In this embodiment, the first frequency band is a downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device.

The second module 102 is configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss, and use the transmit power to pass the first frequency band Sending a random access message to the second network device.

Exemplarily, as an example, the first module 101 is further configured to receive the first power control parameter sent by the first network device when performing random access in the first frequency band, and convert the A power control parameter is sent to the second module 102.

The second module 102 is configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the received actual downlink path loss, specifically:

The second module 102 is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss and the first power control parameter.

Exemplarily, as another example, the second module 102 is further configured to determine the transmit power when randomly accessing the second network device on the first frequency band according to the actual downlink path loss , Receiving the second power control parameter sent by the second network device when performing random access in the second frequency band.

In this embodiment, the second frequency band is a normal uplink NUL frequency band of the second network device.

Correspondingly, the second module 102 is used to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss, specifically:

The second module 102 is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss and the second power control parameter .

Exemplarily, in this embodiment, the random access message includes: random access pilot and random access message 3, and the transmission power includes: transmission power of random access pilot, and transmission of random access message 3 power.

Exemplarily, when the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located in a new air interface NR communication system, the first module is LTE module, the second module is an NR module.

The random access device of this embodiment may be used to implement the implementation solutions of the method embodiments shown in FIG. 4 to FIG. 7. The specific implementation manner and technical effect are similar, and are not described here again.

It should be noted that it should be understood that the division of each module in the devices shown in FIGS. 8 to 10 above is only a division of logical functions, and may be integrated in whole or part into a physical entity or may be physically separated in actual implementation. And these modules can all be implemented in the form of software invoking through processing elements; they can also be implemented in the form of hardware; some modules can also be implemented in the form of invoking software through processing elements, and some modules can be implemented in the form of hardware. For example, the determination module may be a separately established processing element, or it may be implemented by being integrated in a chip of the above-mentioned device, or it may be stored in the memory of the above-mentioned device in the form of a program code, and a processing element of the above-mentioned device Call and execute the function of the above determination module. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together or can be implemented independently. The processing element described here may be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules may be completed by an integrated logic circuit of hardware in a processor element or instructions in the form of software.

For example, the above modules may be one or more integrated circuits configured to implement the above method, for example: one or more specific integrated circuits (application specific integrated circuits, ASICs), or one or more microprocessors (digital signal processor (DSP), or, one or more field programmable gate arrays (field programmable gate array, FPGA), etc. As another example, when a certain module above is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. As another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions may be stored in a readable storage medium, or transmitted from one readable storage medium to another readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center via wired ( For example, coaxial cable, optical fiber, digital subscriber line (DSL) or wireless (such as infrared, wireless, microwave, etc.) to another website, computer, server or data center. The readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available medium integrated servers, data centers, and the like. The usable medium may be a magnetic medium (eg, floppy disk, hard disk, magnetic tape), optical medium (eg, DVD), or semiconductor medium (eg, solid state disk (SSD)), or the like.

Exemplarily, a random access device provided by an embodiment of the present application includes a processor, a memory, and a computer program stored on the memory and executable on the processor, and the processor implements the program when it executes the program The method of the embodiment shown in FIG. 4 to FIG. 7 above.

FIG. 11 shows a simplified schematic diagram of a possible design structure of the terminal device involved in the foregoing embodiment. As shown in FIG. 11, the terminal device may include: a transceiver 111, a controller/processor 112, and a memory 113.

In the embodiment of the present application, the transceiver 111 may be used to receive the downlink signal of the first network device in the first frequency band, and use the determined transmission power to send a random access message to the second network device through the first frequency band.

The controller/processor 112 can control and manage the actions of the terminal device to perform the steps in the embodiments shown in FIG. 4 to FIG. 7 and/or used in other processes of the technology described in this application. For example, the controller/processor 112 is used to control the terminal device to acquire the downlink signal received power of the first network device in the first frequency band, determine the actual downlink path loss of the first frequency band according to the downlink signal received power, and based on The actual downlink path loss determines an operation process such as transmission power when randomly accessing the second network device in the first frequency band. As an example, the controller/processor 112 is used to support the terminal device to perform the steps in FIGS. 4 to 7.

The memory 113 is used to store program codes and data for terminal devices. For example, the memory 113 may be used to store the downlink signal received by the transceiver 111 from the first network device or the second network device, and store the execution instruction and execution result of the controller/processor 112.

Exemplarily, as shown in FIG. 11, the apparatus in this embodiment may include: a modem processor 114.

In the modem processor 114, the encoder 115 may be used to receive uplink signals to be transmitted on the uplink and process the uplink signals (eg, formatting, encoding, and interleaving). The modulator 116 is used to further process (eg, symbol mapping and modulation) the encoded uplink signal. The demodulator 117 is used to process (eg, demodulate) the downlink signal received from the network device. The decoder 118 is used to further process (eg, deinterleave and decode) the downlink signal. The encoder 115, the modulator 116, the demodulator 117, and the decoder 118 may be implemented by a synthesized modem processor 114. These units are based on the radio access technology adopted by the radio access network (for example, the access technology of LTE and other evolved systems).

The random access device of this embodiment may be used to implement the implementation solutions of the method embodiments shown in FIG. 4 to FIG. 7. The specific implementation manner and technical effect are similar, and are not described here again.

Exemplarily, an embodiment of the present application further provides a storage medium that stores instructions, which when executed on a computer, causes the computer to execute the method in the embodiments shown in FIG. 4 to FIG. 7 described above.

Exemplarily, an embodiment of the present application further provides a chip that executes instructions, and the chip is used to execute the method in the embodiments shown in FIG. 4 to FIG. 7.

12 is a schematic structural diagram of an embodiment of a communication system provided by an embodiment of the present application. As shown in FIG. 11, the communication system may include: a terminal device 121, a first network device 122, and a second network device 123.

The terminal device 121 can communicate with the first network device 122 on the first frequency band, or can communicate with the second network device 123 on the second frequency band, and can also communicate with the second network device 123 on the first frequency band Send upstream signals.

Optionally, the first frequency band is a downlink frequency band of the first network device 122, but is a supplementary uplink SUL frequency band of the second network device 123, and the second frequency band is a normal uplink of the second network device NUL.

Exemplarily, the terminal device 121 in this embodiment may be the random access device shown in the embodiments shown in FIGS. 8 and 9 above, or may be the random access device shown in FIG. 10 above, or may be the above-mentioned FIG. 11 The terminal device shown, the terminal device 121 may be used to execute the method of the embodiments shown in FIG. 4 to FIG. 7. For a specific implementation manner of the terminal device 121, refer to the records in the foregoing embodiments, and details are not described herein again.

In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the relationship of the related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the related object is a "or" relationship; in the formula, the character "/" indicates that the related object is a "divide" relationship. "At least one of the following" or a similar expression refers to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one item (a) in a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be a single or multiple Pcs.

It can be understood that the various numerical numbers involved in the embodiments of the present application are only for the convenience of description, and are not used to limit the scope of the embodiments of the present application.

It can be understood that, in the embodiments of the present application, the size of the sequence numbers of the above processes does not mean that the execution order is sequential, and the execution order of each process should be determined by its function and internal logic, and should not be implemented in this application. The implementation process of the examples constitutes no limitation.

Claims (21)

1. A random access method, suitable for terminal equipment, characterized in that the method includes:

   Acquiring the downlink signal received power of the first network device in the first frequency band, where the first frequency band is the downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device;

   Determine the actual downlink path loss of the first frequency band according to the received power of the downlink signal;

   Determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss;

   Sending a random access message to the second network device through the first frequency band using the transmit power.
2. The method according to claim 1, wherein before the determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, the method Also includes:

   Receiving a first power control parameter sent by the first network device when performing random access in the first frequency band.
3. The method according to claim 2, wherein the determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss includes:

   According to the actual downlink path loss and the first power control parameter, determine the transmit power when randomly accessing the second network device in the first frequency band.
4. The method according to claim 1, wherein before the determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss, the method Also includes:

   Receiving a second power control parameter sent by a second network device when performing random access in a second frequency band, where the second frequency band is a normal uplink NUL frequency band of the second network device.
5. The method according to claim 4, wherein the determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss includes:

   According to the actual downlink path loss and the second power control parameter, determine the transmit power when randomly accessing the second network device in the first frequency band.
6. The method according to any one of claims 1-5, wherein the random access message includes: a random access pilot and a random access message 3, and the transmission power includes: a transmission power of a random access pilot 3. The transmit power of random access message 3.
7. The method according to any one of claims 1-6, wherein the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located New air interface NR communication system.
8. A random access device, suitable for terminal equipment, characterized in that the device includes: an acquisition module, a processing module, and a sending module;

   The acquiring module is used to acquire the downlink signal received power of the first network device in the first frequency band, the first frequency band is the downlink frequency band of the first network device, but is a supplementary uplink of the second network device Road SUL frequency band;

   The processing module is configured to determine the actual downlink path loss of the first frequency band according to the received power of the downlink signal, and determine the random access to the first frequency band on the first frequency band according to the actual downlink path loss 2. The transmission power of network equipment;

   The sending module is configured to send the random access message to the second network device through the first frequency band using the transmit power.
9. The apparatus according to claim 8, wherein the apparatus further comprises: a receiving module;

   The receiving module is configured to receive the first network device before the processing module determines the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss The first power control parameter sent when random access is performed in the first frequency band.
10. The apparatus according to claim 9, wherein the processing module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the actual downlink path loss, Specifically:

    The processing module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the actual downlink path loss and the first power control parameter.
11. The apparatus according to claim 8, wherein the apparatus further comprises: a receiving module;

    The receiving module is configured to receive the data sent by the second network device before the processing module determines the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss A second power control parameter when performing random access in a second frequency band, where the second frequency band is a normal uplink NUL frequency band of the second network device.
12. The apparatus according to claim 11, wherein the processing module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the actual downlink path loss, Specifically:

    The processing module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss and the second power control parameter.
13. The apparatus according to any one of claims 8-12, wherein the random access message includes: a random access pilot and a random access message 3, and the transmission power includes: a transmission power of a random access pilot 3. The transmit power of random access message 3.
14. The apparatus according to any one of claims 8 to 13, wherein the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located New air interface NR communication system.
15. A random access device, suitable for terminal equipment, characterized in that the device includes: a first module and a second module;

    The first module is used to obtain the downlink signal received power of the first network device in the first frequency band, determine the actual downlink path loss of the first frequency band according to the downlink signal received power, and convert the actual downlink path Loss transmission to the second module, the first frequency band is a downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device;

    The second module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the received actual downlink path loss, and use the transmit power to pass through the first frequency band Sending a random access message to the second network device.
16. The device according to claim 15, characterized in that

    The first module is further configured to receive the first power control parameter sent by the first network device when performing random access in the first frequency band, and send the first power control parameter to the first Two modules

    The second module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss, specifically:

    The second module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band according to the received actual downlink path loss and the first power control parameter.
17. The device according to claim 15, characterized in that

    The second module is further configured to receive the data sent by the second network device before determining the transmit power when randomly accessing the second network device in the first frequency band according to the actual downlink path loss. A second power control parameter when performing random access in a second frequency band, where the second frequency band is a normal uplink NUL frequency band of the second network device;

    The second module is configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the received actual downlink path loss, specifically:

    The second module is specifically configured to determine the transmit power when randomly accessing the second network device in the first frequency band based on the received actual downlink path loss and the second power control parameter.
18. The apparatus according to any one of claims 15-17, wherein the terminal device and the first network device are located in a long-term evolution LTE communication system, and the terminal device and the second network device are located In a new air interface NR communication system, the first module is an LTE module, and the second module is an NR module.
19. A random access device includes a processor, a memory, and a computer program stored on the memory and capable of running on the processor, characterized in that, when the processor executes the program, the foregoing claims 1- 7. The method according to any one of.
20. A storage medium characterized in that instructions are stored in the storage medium, which when run on a computer, causes the computer to execute the method according to any one of claims 1-7.
21. A communication system, characterized by comprising: a terminal device, a first network device and a second network device;

    The terminal device communicates with the first network device in the first frequency band, communicates with the second network device in the second frequency band, or sends an uplink signal to the second network device in the first frequency band;

    The first frequency band is a downlink frequency band of the first network device, but is a supplementary uplink SUL frequency band of the second network device, and the second frequency band is a normal uplink of the second network device Road NUL;

    The terminal device is the device according to any one of claims 8-14 or the device according to any one of claims 15-18 or the device according to claim 19.

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