A method, device and related equipment for establishing a communication connection

Abstract

An embodiment of the present application discloses a method for establishing a communication connection, which can be applied to the field of communications. The method includes: a terminal receives a first message sent by a first device, the first message including information about the uplink resources of a second device; the terminal sends a second message to the second device through the uplink resources of the second device. The terminal receives a third message sent by the first device, the third message including information about the downlink resources of the second device, and the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. The terminal establishes a downlink communication connection with the second device through the first device. Therefore, the broadcast resources of the second device can be saved, and even the public channel broadcast of the second device can be turned off, thereby reducing the energy consumption of the second device.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a method, apparatus, and related equipment for establishing a communication connection. Background Art

[0002] Electricity costs account for approximately 15.88% of a telecom operator's operating costs. Radio frequency (RF) modules consume 80%-90% of a site's energy consumption, representing a significant portion of the total energy consumption of access network equipment. Therefore, reducing RF module energy consumption is crucial to lowering electricity costs.

[0003] Currently, a typical way to reduce the energy consumption of RF modules is symbol shutdown. Symbol shutdown means that when the access network device has no data to send in some symbols, the access network device turns off the power amplifier during these "no data to send" symbol periods, thereby reducing system power consumption. When the access network device detects a symbol without data in the time domain, it turns off the power supply of the amplifier and related hardware to reduce the static power consumption of the hardware. For example, when the access network device is busy, the PA of the access network device needs to be turned on all the time. However, when there is no data to be transmitted, from an energy-saving perspective, the PA can be turned off for a short period of time to achieve the purpose of energy saving. The energy saving benefit of symbol shutdown depends on the shutdown time of the amplifier and related hardware, that is, the ratio of symbols without data to all symbols.

[0004] Although using symbol shutdown can reduce the energy consumption of RF modules, how to further reduce energy consumption is an issue that has always needed to be considered in the communications field. Summary of the Invention

[0005] The present application provides a method, apparatus and related equipment for establishing a communication connection in order to reduce energy consumption.

[0006] A first aspect of the present application provides a method for establishing a communication connection.

[0007] The method includes: after a terminal completes a cell search, it performs downlink frame synchronization and cell residency with a first device. After completing the above steps, the terminal receives a first message sent by the first device, the first message including information about the second device's uplink resources; and the terminal sends a second message to the second device using the second device's uplink resources. The terminal then receives a third message sent by the first device, the third message including information about the second device's downlink resources. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. The terminal establishes a downlink communication connection with the second device via the first device. This conserves the second device's broadcast resources and can even disable the second device's public channel broadcast, thereby reducing the second device's energy consumption. Furthermore, the first message is sent via the first device's downlink resources, and the second message is received via the second device's uplink resources, achieving uplink and downlink decoupling. With uplink and downlink decoupling, the second device can receive the terminal's second message. Compared to a terminal interacting only with the first device, this ensures that the terminal is within the second device's signal coverage and that the terminal and the second device establish a first downlink communication connection.

[0008] In an optional design of the first aspect, the second message is a radio resource control (RRC) establishment request message. In which, by establishing the first downlink communication connection between the terminal and the second device in random access, the delay of the terminal accessing the second device can be reduced.

[0009] In an optional design of the first aspect, the first message also includes a Reference Signal Receiving Power (RSRP) threshold and information about uplink resources of the first device, the uplink resources of the second device are used by the terminal to establish a first uplink communication connection with the second device based on the uplink resources of the second device, and the uplink resources of the first device are used by the terminal to establish a second uplink communication connection with the first device based on the uplink resources of the first device; the method further includes: if the RSRP between the terminal and the first device is greater than the RSRP threshold, the terminal sends data, signaling, or a random access signal to the second device through the first uplink communication connection; or, if the RSRP between the terminal and the first device is less than the RSRP threshold, the terminal sends data, signaling, or a random access signal to the first device through the second uplink communication connection; or, if the RSRP between the terminal and the first device is equal to the RSRP threshold, the terminal sends data, signaling, or a random access signal through the first uplink communication connection or the second uplink communication connection. The terminal resides in the cell where the first device is located, the second uplink communication connection is the uplink (UL) of the terminal, and the first uplink communication connection is the SUL of the terminal. In related supplementary uplink (SUL) technologies, if the RSRP of the terminal and the first device is greater than an RSRP threshold, the terminal selects uplink (UL) data transmission. If the RSRP of the terminal and the first device is less than the RSRP threshold, the terminal selects SUL data transmission. This application allows the terminal to select an appropriate uplink communication connection even when the second device reduces or eliminates common channel broadcasts.

[0010] In an optional design of the first aspect, the first message also includes a first physical cell identifier (PCI) and a second PCI. The method also includes: the terminal receives a first primary synchronization signal (PSS) and a secondary synchronization signal (SSS) sent by the second device, the first PSS and SSS corresponding to the first PCI; the terminal receives a second PSS and SSS sent by the third device, the second PSS and SSS corresponding to the second PCI; if the first PCI strength is greater than the second PCI strength, the terminal sends a second message to the second device through the uplink resources of the second device, the first PCI strength is the signal strength of the first PSS and SSS, and the second PCI strength is the signal strength of the second PSS and SSS. Wherein, if within the signal coverage of the first device, in addition to the first device, there are multiple devices that can provide downlink services for the terminal, then it is desired to select a device with a stronger signal to provide downlink services for the terminal. By measuring the PSS and SSS sent by the second device and the third device, it is determined which device has a stronger signal, and the second message is sent to the second device with a stronger signal strength, thereby improving the downlink communication quality of the terminal.

[0011] In an optional design of the first aspect, the first message also includes measurement information, and the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength and / or the second PCI strength, where the first PCI strength is the downlink signal strength of the cell corresponding to the first PCI, and the second PCI strength is the downlink signal strength of the cell corresponding to the second PCI. For example, the triggering event is a measurement event, which indicates how long after receiving the SSB or SIB1 message the terminal starts and / or ends measuring the first PSS and SSS sent by the second device. Alternatively, it is specified that as long as the terminal resides in cell2, it is necessary to measure the signal strength of the cell corresponding to the frequency band of the second device to obtain the first PCI strength and / or the second PCI strength. Alternatively, it is specified that when the downlink RSRP signal strength of cell2 measured by the terminal is higher than a certain threshold, it is necessary to measure the signal of the cell of the second device and / or the third device. By informing the terminal under what conditions to receive the first PSS and SSS, the first aspect can ensure that the terminal can receive the first PSS and SSS under such conditions. The second aspect can enable the second device to send the first PSS and SSS under such conditions, thereby reducing the number of PSSs and SSSs sent by the second device, thereby reducing the energy consumption of the second device.

[0012] In an optional design of the first aspect, the third message or the first message further includes system frame number (SFN) information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device based on the SFN information. In the case where the second device does not broadcast on a common channel, the terminal cannot complete downlink frame synchronization with the second device through the broadcast information of the second device. Using the SFN information in the first message, the terminal can complete downlink frame synchronization with the second device, thereby improving the success rate of data transmission. Furthermore, the SFN information is the time offset between the first device and the second device. Since the terminal has already performed downlink frame synchronization with the first device, after obtaining the time offset between the first device and the second device, the terminal can achieve downlink frame synchronization with the second device.

[0013] In an optional design of the first aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna. Among them, low frequency and high frequency are relative. When the center frequency of the spectrum resources used by the second base station is greater than the center frequency of the spectrum resources used by the first base station, the second device can be considered to be a high-frequency base station and the first device is a low-frequency base station. Under the same power, the signal coverage range of the high-frequency base station is smaller than the signal coverage range of the low-frequency base station. Therefore, the number of high-frequency base stations needs to be greater than the number of low-frequency base stations. By reducing or shutting down the public channel broadcast of the high-frequency base station, more energy consumption can be reduced compared to shutting down or reducing the public channel broadcast of the low-frequency base station.

[0014] In an optional design of the first aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0015] In an optional design of the first aspect, the third message also includes information about downlink resources of the first device. The downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device. The first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a carrier aggregation (CA) manner. Transmitting data to the terminal in a CA manner using the first downlink communication connection and the second downlink communication connection can improve downlink data transmission efficiency of the terminal.

[0016] In an optional design of the first aspect, the first message also includes a tracking signal, which is used by the terminal to perform fine downlink synchronization with the second device based on the tracking signal. Fine synchronization refers to precise synchronization, which may include precise time and frequency synchronization. If the second device does not broadcast on a common channel, the terminal cannot complete fine downlink synchronization with the second device using the second device's broadcast information. Using the tracking signal in the first message, the terminal can complete fine downlink synchronization with the second device, thereby improving data transmission reliability.

[0017] A second aspect of the present application provides a method for establishing a communication connection.

[0018] The method includes:

[0019] After the terminal completes the cell search, it performs downlink frame synchronization and cell residency with the first device. After completing the above steps, the first device sends a first message to the terminal. The first message includes information about the uplink resources of the second device. The uplink resources of the second device are used by the terminal to send a second message to the second device via the uplink resource device of the second device. The second message is used to obtain a third message. The first device sends a third message to the terminal. The third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0020] In an optional design of the second aspect, the second message is an RRC establishment request message. Wherein, by establishing the first downlink communication connection between the terminal and the second device in random access, the delay of the terminal accessing the second device can be reduced.

[0021] In an optional design of the second aspect, the first message also includes information about the reference signal received power RSRP threshold and the uplink resources of the first device. The uplink resources of the second device are used for the terminal to establish a first uplink communication connection with the second device based on the uplink resources of the second device. The uplink resources of the first device are used for the terminal to establish a second uplink communication connection with the first device based on the uplink resources of the first device. The RSRP threshold is used for the terminal to send data signaling or a random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data signaling or a random access signal to the first device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data signaling or a random access signal to the first device through the second uplink communication connection if the target RSRP is equal to the RSRP threshold.

[0022] In an optional design of the second aspect, the first message also includes a first PCI and a second PCI; the method also includes: the first device sends a first main synchronization signal PSS and a supplementary synchronization signal SSS to the terminal, the first PSS and SSS are used by the terminal to obtain the first PCI strength, the first PSS and SSS correspond to the first PCI, the first PCI strength is used to send a second message to the second device through uplink resources if the first PCI strength is greater than the second PCI strength, the second PCI strength is obtained by the terminal based on the second PSS and SSS sent by the second device, and the second PSS and SSS correspond to the second PCI.

[0023] In an optional design of the second aspect, the first message also includes information about the downlink resources of the third device and information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to receive the first primary synchronization signal PSS and the supplementary synchronization signal SSS sent by the second device through the downlink resources of the second device; the downlink resources of the third device are used by the terminal to receive the second PSS and SSS sent by the third device through the downlink resources of the third device. If this is not the first time the terminal is connected to the second device, the terminal can obtain information about the downlink resources of the second device during the previous service provided by the second device to the terminal. If the terminal is connected to the second device for the first time, the first message also includes information about the downlink resources of the second device.

[0024] In an optional design of the second aspect, the first message also includes measurement information, where the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength.

[0025] In an optional design of the second aspect, the third message or the first message further includes system frame number SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0026] In an optional design of the second aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0027] In an optional design of the second aspect, the first message further includes a cell identifier of the second device and a cell identifier of the third device.

[0028] In an optional design of the second aspect, the first message also includes a tracking signal, and the tracking signal is used for the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0029] In an optional design of the second aspect, the third message also includes information about the downlink resources of the first device. The information about the downlink resources of the first device is used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device. The first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0030] For the description of the beneficial effects of the second aspect of the present application, reference can be made to the description of the beneficial effects of the aforementioned first aspect.

[0031] A third aspect of the present application provides a method for establishing a communication connection.

[0032] The method includes: a second device receiving a second message sent by the terminal through an uplink resource of the second device, where the uplink resource of the second device is obtained by the terminal from the first message sent by the first device;

[0033] The second device sends a confirmation message to the first device, and the confirmation message is used to allow the first device to send a third message to the terminal. The third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0034] In an optional design of the third aspect, the second message is an RRC establishment request message. Wherein, by establishing the first downlink communication connection between the terminal and the second device in random access, the delay of the terminal accessing the second device can be reduced.

[0035] In an optional design of the third aspect, the first message also includes information about the reference signal received power RSRP threshold and the uplink resources of the first device. The uplink resources of the second device are used for the terminal to establish a first uplink communication connection with the second device based on the uplink resources of the second device. The uplink resources of the first device are used for the terminal to establish a second uplink communication connection with the first device based on the uplink resources of the first device. The RSRP threshold is used for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the target RSRP is equal to the RSRP threshold.

[0036] In an optional design of the third aspect, the first message also includes a first PCI and a second PCI; the method also includes: the second device sends a second main synchronization signal PSS and a supplementary synchronization signal SSS to the terminal, the second PSS and SSS are used by the terminal to obtain a second PCI strength, the second PSS and SSS correspond to the second PCI, the second PCI strength is used to send a second message to the second device through uplink resources if the first PCI strength is greater than the second PCI strength, the first PCI strength is obtained by the terminal based on the first PSS and SSS sent by the first device, and the first PSS and SSS correspond to the first PCI.

[0037] In an optional design of the third aspect, the first message also includes measurement information, where the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength.

[0038] In an optional design of the third aspect, the third message or the first message further includes SFN information, and the SFN information is used for the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0039] In an optional design of the third aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0040] In an optional design of the third aspect, the first message further includes a cell identifier of the second device and a cell identifier of the third device.

[0041] In an optional design of the third aspect, the first message also includes a tracking signal, and the tracking signal is used for the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0042] In an optional design of the third aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0043] For the description of the beneficial effects of the third aspect of the present application, reference may be made to the description of the beneficial effects of the aforementioned first aspect.

[0044] A fourth aspect of the present application provides a method for establishing a communication connection.

[0045] The method includes: a terminal receiving a first message from a first device;

[0046] The terminal sends an uplink measurement signal to the second device and the third device;

[0047] The terminal sends a second message to the first device;

[0048] The terminal receives a third message sent by the first device, where the third message is obtained based on measurement results, the measurement results including a first measurement result and a second measurement result, the first measurement result being obtained by the uplink measurement signal received by the second device, and the second measurement result being obtained by the uplink measurement signal received by the third device, and the third message including information about downlink resources of the second device, where the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0049] The terminal establishes a downlink communication connection with the second device through the first device. This saves the second device's broadcast resources and can even disable the second device's public channel broadcast, thereby reducing the second device's energy consumption. Furthermore, if multiple devices other than the first device are within the first device's signal coverage that can provide downlink services to the terminal, it is desirable to select a device with a stronger signal to provide downlink services to the terminal. The terminal transmits an uplink measurement signal, and the measuring device obtains the strength of the uplink measurement signal to obtain the signal quality between the second device and the terminal, and the signal quality between the third device and the terminal. The measuring device can be the second device, the third device, or an indoor baseband unit (BBU). The magnitude of the two signal qualities influences whether the terminal establishes a first downlink communication connection with the second device or the third device. If only signal quality, i.e., the measurement result, influences the selection of the second or third device, then if the first measurement result is greater than the second measurement result, the second device is selected to provide downlink services to the terminal. Compared to the method where the terminal measures the PCI strength of the PSS and SSS signals sent by the second and third devices, this method can save downlink resources for the second and third devices. In particular, the second message is used for random access to reduce the delay of the terminal accessing the second device.

[0050] In an optional design of the fourth aspect, the first message further includes information about a sending period;

[0051] The terminal sending an uplink measurement signal to the second device and the third device includes:

[0052] The terminal sends the uplink measurement signal to the second device and the third device according to the sending period.

[0053] For example, the terminal may be expected to send uplink measurement signals at different intervals depending on the terminal's mobility: a shorter interval for faster speeds and a longer interval for slower speeds. Another example is the terminal's battery level: a shorter interval for higher remaining battery levels and a longer interval for lower remaining battery levels.

[0054] In an optional design of the fourth aspect, the first message further includes information about a first uplink measurement resource, where the first uplink measurement resource is used for terminals that are not allocated measurement resources to send uplink measurement signals. Although the second device or the third device does not know the identity of the terminals that are not allocated measurement resources, it can obtain a heat map of the terminals that are not allocated measurement resources, which facilitates the second device or the third device's load assessment and determination of the current network status, for example, for energy conservation.

[0055] In an optional design of the fourth aspect, the first message is obtained based on the measurement result and the available resources, and the available resources include the available resources of the second device and the available resources of the third device. Among them, in addition to the measurement result affecting whether the terminal establishes the first downlink communication connection with the second device or the first downlink communication connection with the third device, available resources are also an influencing factor. Available resources can be spectrum resources, or central processing unit (CPU) utilization, etc. The two factors are used to jointly determine whether the second device or the third device is selected as the DL of the terminal, further ensuring the normal establishment of the first downlink communication connection.

[0056] In an optional design of the fourth aspect, the third message is sent by the fourth device to the terminal through the first device, and the third message is obtained by the fourth device according to the first measurement result and the second measurement result.

[0057] In an optional design of the fourth aspect, the third message or the first message also includes SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device based on the SFN information. In the case where the second device does not broadcast on a common channel, the terminal cannot complete downlink frame synchronization with the second device through the broadcast information of the second device. Through the SFN information in the first message, the terminal can complete downlink frame synchronization with the second device, thereby improving the success rate of data transmission. Furthermore, the SFN information is the time deviation between the first device and the second device. Since the terminal has already performed downlink frame synchronization with the first device, the terminal can achieve downlink frame synchronization with the second device after obtaining the time deviation between the first device and the second device.

[0058] In an optional design of the fourth aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna. Here, low frequency and high frequency are relative. When the center frequency of the spectrum resources used by the second base station is greater than the center frequency of the spectrum resources used by the first base station, the second device can be considered to be a high-frequency base station and the first device is a low-frequency base station. Under the same power, the signal coverage range of the high-frequency base station is smaller than the signal coverage range of the low-frequency base station. Therefore, the number of high-frequency base stations needs to be greater than the number of low-frequency base stations. By reducing or shutting down the public channel broadcast of the high-frequency base station, more energy consumption can be reduced compared to shutting down or reducing the public channel broadcast of the low-frequency base station.

[0059] In an optional design of the fourth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0060] In an optional design of the fourth aspect, the third message also includes information about downlink resources of the first device, where the downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner. Transmitting data to the terminal in a CA manner using the first downlink communication connection and the second downlink communication connection can improve downlink data transmission efficiency of the terminal.

[0061] In an optional design of the fourth aspect, the first message also includes a tracking signal, and the tracking signal is used by the terminal to perform downlink fine synchronization with the second device based on the tracking signal. Here, fine synchronization refers to precise synchronization, which may include precise time and frequency synchronization. If the second device does not broadcast on a public channel, the terminal cannot complete downlink fine synchronization with the second device through the broadcast information of the second device. Through the tracking signal in the first message, the terminal can complete downlink fine synchronization with the second device, thereby improving the reliability of data transmission.

[0062] A fifth aspect of the present application provides a method for establishing a communication connection.

[0063] The method includes:

[0064] The first device sends a first message to the terminal, where the first message is used by the terminal to send an uplink measurement signal to the second device and the third device according to the first message;

[0065] The first device receives a second message sent by the terminal;

[0066] The first device sends a third message to the terminal, where the third message is obtained based on a measurement result, where the measurement result includes a first measurement result and a second measurement result, where the first measurement result is obtained from the uplink measurement signal received by the second device, and the second measurement result is obtained from the uplink measurement signal received by the third device. The third message includes information about the downlink resources of the second device, where the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. In an optional design of the fifth aspect, the first message also includes information about the uplink resources for sending measurement information, where the information about the uplink resources of the measurement information includes information about the uplink resources of the second device, and where the uplink resources of the measurement information are used by the terminal to send the uplink measurement signal to the second device and the third device through the uplink resources of the measurement information.

[0067] In an optional design of the fifth aspect, the first message further includes information about a sending period, where the sending period is used by the terminal to send the uplink measurement signal to the second device and the third device according to the sending period.

[0068] In an optional design of the fifth aspect, the first message further includes information about a first uplink measurement resource, where the first measurement resource is used for a terminal to which no measurement resources are allocated to send an uplink measurement signal.

[0069] In an optional design of the fifth aspect, the third message is obtained based on the measurement results and available resources, and the available resources include available resources of the second device and available resources of the third device.

[0070] In an optional design of the fifth aspect, the third message is sent by the fourth device to the terminal through the first device, and the third message is obtained by the fourth device according to the first measurement result and the second measurement result.

[0071] In an optional design of the fifth aspect, the third message or the first message also includes SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0072] In an optional design of the fifth aspect, the first device is a low-frequency access network device or a low-frequency antenna, and the second device is a high-frequency access network device or a high-frequency antenna.

[0073] In an optional design of the fifth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0074] In an optional design of the fifth aspect, the third message also includes information about the downlink resources of the first device, and the information about the downlink resources of the first device is used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a carrier aggregation CA manner.

[0075] In an optional design of the fifth aspect, the third message or the first message also includes a tracking signal, and the tracking signal is used by the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0076] For the description of the beneficial effects of the fifth aspect of the present application, reference can be made to the description of the beneficial effects of the aforementioned fourth aspect.

[0077] A sixth aspect of the present application provides a method for establishing a communication connection.

[0078] The method includes:

[0079] The second device receives an uplink measurement signal sent by the terminal, where the uplink measurement signal is obtained by the terminal according to the first message sent by the first device.

[0080] The second device sends a confirmation message to the first device, where the confirmation message is used to enable the first device to send a third message to the terminal after receiving the second message. The third message is obtained based on measurement results, where the measurement results include a first measurement result and a second measurement result. The first measurement result is obtained by the uplink measurement signal received by the second device, and the second measurement result is obtained by the uplink measurement signal received by the third device. The third message includes information about downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0081] In an optional design of the sixth aspect, the first message further includes information about a sending period, where the sending period is used by the terminal to send the uplink measurement signal to the second device and the third device according to the sending period.

[0082] In an optional design of the sixth aspect, the first message further includes information about a first uplink measurement resource, where the first measurement resource is used for a terminal to which no measurement resources are allocated to send an uplink measurement signal.

[0083] In an optional design of the sixth aspect, the third message is obtained based on the measurement results and available resources, and the available resources include available resources of the second device and available resources of the third device.

[0084] In an optional design of the sixth aspect, the third message is sent by the fourth device to the terminal through the first device, and the third message is obtained by the fourth device according to the first measurement result and the second measurement result.

[0085] In an optional design of the sixth aspect, the third message or the first message also includes SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0086] In an optional design of the sixth aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0087] In an optional design of the sixth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0088] In an optional design of the sixth aspect, the third message also includes information about the downlink resources of the first device, and the information about the downlink resources of the first device is used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a carrier aggregation CA manner.

[0089] In an optional design of the sixth aspect, the first message also includes a tracking signal, and the tracking signal is used by the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0090] For the description of the beneficial effects of the sixth aspect of the present application, reference may be made to the description of the beneficial effects of the aforementioned fourth aspect.

[0091] In a seventh aspect, the present application provides a device for establishing a communication connection.

[0092] The apparatus includes: a first receiving module, configured to receive a first message sent by a first device, wherein the first message includes information about uplink resources of a second device;

[0093] A sending module is used to send a second message to the second device through the uplink resources of the second device.

[0094] The second receiving module is used to receive a third message sent by the first device, where the third message includes information about the downlink resources of the second device, and the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device according to the downlink resources of the second device.

[0095] In an optional design of the seventh aspect, the first message also includes information about an RSRP threshold and an uplink resource of the first device, the uplink resource of the second device is used by the apparatus to establish a first uplink communication connection with the second device according to the uplink resource of the second device, and the uplink resource of the first device is used by the terminal to establish a second uplink communication connection with the first device according to the uplink resource of the first device; the sending module is further configured to, if the RSRP between the apparatus and the first device is greater than the RSRP threshold, send data, signaling or a random access signal to the second device through the first uplink communication connection; or,

[0096] The sending module is further configured to, if the RSRP between the apparatus and the first device is less than the RSRP threshold, send data, signaling or random access signal to the second device through the second uplink communication connection; or,

[0097] The sending module is further configured to, if the RSRP of the apparatus and the first device is equal to the RSRP threshold, cause the apparatus to send data, signaling, or a random access signal through the first uplink communication connection or the second uplink communication connection.

[0098] In an optional design of the seventh aspect, the first message further includes a first PCI and a second PCI;

[0099] The first receiving module is further configured to receive a first primary synchronization signal PSS and a supplementary synchronization signal SSS sent by the second device, where the first PSS and SSS correspond to the first PCI;

[0100] The first receiving module is further configured to receive a second PSS and SSS sent by the third device, where the second PSS and SSS correspond to the second PCI;

[0101] The sending module is specifically used to send the second message to the second device through the uplink resources of the second device if the first PCI strength is greater than the second PCI strength, the first PCI strength is the signal strength of the first PSS and SSS, and the second PCI strength is the signal strength of the second PSS and SSS.

[0102] In an optional design of the seventh aspect, the first message also includes measurement information, and the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength and / or the second PCI strength.

[0103] In an optional design of the seventh aspect, it is characterized in that the third message or the first message also includes SFN information, and the SFN information is used by the device to perform downlink frame synchronization with the second device according to the SFN information.

[0104] In an optional design of the seventh aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0105] In an optional design of the seventh aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0106] In an optional design of the seventh aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a first downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0107] In an optional design of the seventh aspect, the first message also includes a tracking signal, and the tracking signal is used for the apparatus to perform downlink fine synchronization with the second device according to the tracking signal.

[0108] In an eighth aspect, the present application provides a device for establishing a communication connection.

[0109] The apparatus includes: a first sending module, configured to send a first message to a terminal, wherein the first message includes information about uplink resources of a second device, and the uplink resources of the second device are used by the terminal to send a second message to the second device through the uplink resources of the second device;

[0110] The second sending module is used to send a third message to the terminal, where the third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0111] In an optional design of the eighth aspect, the first message also includes information about the reference signal received power RSRP threshold and the uplink resources of the first device. The uplink resources of the second device are used for the terminal to establish a first uplink communication connection with the second device based on the uplink resources of the second device. The uplink resources of the first device are used for the terminal to establish a second uplink communication connection with the first device based on the uplink resources of the first device. The RSRP threshold is used for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the target RSRP is equal to the RSRP threshold.

[0112] In an optional design of the eighth aspect, the first message further includes a first PCI and a second PCI;

[0113] The first sending module is also used to send a first main synchronization signal PSS and a supplementary synchronization signal SSS to the terminal. The first PSS and SSS are used by the terminal to obtain a first PCI strength. The first PSS and SSS correspond to the first PCI. The first PCI strength is used to send a second message to the second device through uplink resources if the first PCI strength is greater than the second PCI strength. The second PCI strength is obtained by the terminal based on the second PSS and SSS sent by the second device. The second PSS and SSS correspond to the second PCI.

[0114] In an optional design of the eighth aspect, the first message also includes measurement information, where the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength and / or the second PCI strength.

[0115] In an optional design of the eighth aspect, the third message or the first message also includes SFN information, and the SFN information is used for the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0116] In an optional design of the eighth aspect, the apparatus is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0117] In an optional design of the eighth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0118] In an optional design of the eighth aspect, the first message also includes a tracking signal, and the tracking signal is used for the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0119] In an optional design of the eighth aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0120] In a ninth aspect, the present application provides a device for establishing a communication connection.

[0121] The apparatus comprises: a receiving module, configured to receive a second message sent by a terminal through an uplink resource of a second device, where the uplink resource of the second device is obtained by the terminal from a first message sent by a first device.

[0122] A sending module is used to send a confirmation message to the first device, and the confirmation message is used to allow the first device to send a third message to the terminal. The third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0123] In an optional design of the ninth aspect, the first message also includes information about the reference signal received power RSRP threshold and the uplink resources of the first device. The uplink resources of the second device are used for the terminal to establish a first uplink communication connection with the second device based on the uplink resources of the second device. The uplink resources of the first device are used for the terminal to establish a second uplink communication connection with the first device based on the uplink resources of the first device. The RSRP threshold is used for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the target RSRP is equal to the RSRP threshold.

[0124] In an optional design of the ninth aspect, the first message further includes a first PCI and a second PCI;

[0125] The sending module is also used to send a second main synchronization signal PSS and a supplementary synchronization signal SSS to the terminal. The second PSS and SSS are used by the terminal to obtain a second PCI strength. The second PSS and SSS correspond to the second PCI. The second PCI strength is used to send a second message to the second device through uplink resources if the first PCI strength is greater than the second PCI strength. The first PCI strength is obtained by the terminal based on the first PSS and SSS sent by the first device. The first PSS and SSS correspond to the first PCI.

[0126] In an optional design of the ninth aspect, the first message also includes measurement information, where the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength and / or the second PCI strength.

[0127] In an optional design of the ninth aspect, the third message or the first message also includes SFN information, and the SFN information is used for the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0128] In an optional design of the ninth aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0129] In an optional design of the ninth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0130] In an optional design of the ninth aspect, the first message also includes a tracking signal, and the tracking signal is used for the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0131] In an optional design of the ninth aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0132] In a tenth aspect, the present application provides a device for establishing a communication connection.

[0133] The device includes:

[0134] A first receiving module, configured to receive a first message from a first device;

[0135] A first sending module, configured to send an uplink measurement signal to the second device and the third device;

[0136] A second sending module, configured to send a second message to the first device;

[0137] a second receiving module, configured to receive a third message sent by the first device, where the third message is obtained based on a measurement result, the measurement result including a first measurement result and a second measurement result, the first measurement result being obtained by the uplink measurement signal received by the second device, and the second measurement result being obtained by the uplink measurement signal received by the third device, the third message including information about downlink resources of the second device, where the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0138] The first sending module is specifically configured to send the uplink measurement signal to the second device and the third device through the uplink resource of the measurement information.

[0139] In an optional design of the tenth aspect, the first message further includes information about a sending period;

[0140] The first sending module is specifically configured to send the uplink measurement signal to the second device and the third device according to the sending period.

[0141] In an optional design of the tenth aspect, the first message also includes information about a first uplink measurement resource, where the first uplink measurement resource is used for a terminal to which no measurement resources are allocated to send an uplink measurement signal.

[0142] In an optional design of the tenth aspect, the first message is obtained based on the measurement results and available resources, and the available resources include available resources of the second device and available resources of the third device.

[0143] In an optional design of the tenth aspect, the third message is sent by the fourth device to the terminal through the first device, and the third message is obtained by the fourth device according to the first measurement result and the second measurement result.

[0144] In an optional design of the tenth aspect, the third message or the first message also includes SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0145] In an optional design of the tenth aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0146] In an optional design of the tenth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0147] In an optional design of the tenth aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0148] In an optional design of the tenth aspect, the first message also includes a tracking signal, and the tracking signal is used by the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0149] In an eleventh aspect, the present application provides a device for establishing a communication connection.

[0150] The device includes:

[0151] A first sending module, configured for a terminal to send a first message, wherein the first message is configured for the terminal to send an uplink measurement signal to a second device and a third device according to the first message;

[0152] A receiving module, configured to receive a second message sent by the terminal;

[0153] The second sending module is configured to send a third message to the terminal, where the third message is obtained based on a measurement result, the measurement result including a first measurement result and a second measurement result, the first measurement result being obtained by the uplink measurement signal received by the second device, and the second measurement result being obtained by the uplink measurement signal received by the third device, and the third message including information about the downlink resources of the second device, where the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. In an optional design of the eleventh aspect, the first message also includes information about the uplink resources for sending the measurement information, the information about the uplink resources of the measurement information includes information about the uplink resources of the second device, and the uplink resources of the measurement information are used by the terminal to send the uplink measurement signal to the second device and the third device through the uplink resources of the measurement information.

[0154] In an optional design of the eleventh aspect, the first message further includes information about a sending period, and the sending period is used by the terminal to send the uplink measurement signal to the second device and the third device according to the sending period.

[0155] In an optional design of the eleventh aspect, the first message also includes information about a first uplink measurement resource, where the first uplink measurement resource is used for a terminal to which no measurement resources are allocated to send an uplink measurement signal.

[0156] In an optional design of the eleventh aspect, the third message is obtained based on the measurement results and available resources, and the available resources include available resources of the second device and available resources of the third device.

[0157] In an optional design of the eleventh aspect, the third message is sent by the fourth device to the terminal through the first device, and the third message is obtained by the fourth device according to the first measurement result and the second measurement result.

[0158] In an optional design of the eleventh aspect, the third message or the first message also includes SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0159] In an optional design of the eleventh aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0160] In an optional design of the eleventh aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0161] In an optional design of the eleventh aspect, the third message also includes information about the downlink resources of the first device, and the information about the downlink resources of the first device is used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a carrier aggregation CA manner.

[0162] In an optional design of the eleventh aspect, the first message also includes a tracking signal, and the tracking signal is used by the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0163] A twelfth aspect of the present application provides a device for establishing a communication connection.

[0164] The device includes:

[0165] The receiving module is configured to receive an uplink measurement signal sent by a terminal, where the uplink measurement signal is obtained by the terminal according to a first message sent by a first device.

[0166] a sending module, configured to send a confirmation message to the first device, where the confirmation message is used to enable the first device to send a third message to the terminal after receiving the second message, where the third message is obtained based on a measurement result, where the measurement result includes a first measurement result and a second measurement result, where the first measurement result is obtained by the uplink measurement signal received by the second device, and the second measurement result is obtained by the uplink measurement signal received by the third device, and the third message includes information about downlink resources of the second device, where the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0167] In an optional design of the twelfth aspect, the first message also includes information about a sending period, and the sending period is used by the terminal to send the uplink measurement signal to the second device and the third device according to the sending period.

[0168] In an optional design of the twelfth aspect, the first message also includes information about a first uplink measurement resource, where the first uplink measurement resource is used for a terminal to which no measurement resources are allocated to send an uplink measurement signal.

[0169] In an optional design of the twelfth aspect, the third message is obtained based on the measurement results and available resources, and the available resources include available resources of the second device and available resources of the third device.

[0170] In an optional design of the twelfth aspect, the third message is sent by the fourth device to the terminal through the first device, and the third message is obtained by the fourth device according to the first measurement result and the second measurement result.

[0171] In an optional design of the twelfth aspect, the third message or the first message also includes SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0172] In an optional design of the twelfth aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0173] In an optional design of the twelfth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0174] In an optional design of the twelfth aspect, the third message also includes information about the downlink resources of the first device, and the information about the downlink resources of the first device is used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0175] In an optional design of the twelfth aspect, the first message also includes a tracking signal, and the tracking signal is used by the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0176] In a thirteenth aspect of the present application, a terminal is provided, the terminal including a transceiver and a processor, the transceiver being configured to receive a first message sent by a first device, the first message including information about uplink resources of a second device; send a second message to the second device via the uplink resources of the second device; receive a third message sent by the first device, the third message including information about downlink resources of the second device, the downlink resources of the second device being used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0177] In an optional design of the thirteenth aspect, the first message also includes information about an RSRP threshold and uplink resources of the first device, the uplink resources of the second device are used by the device to establish a first uplink communication connection with the second device according to the uplink resources of the second device, and the uplink resources of the first device are used by the terminal to establish a second uplink communication connection with the first device according to the uplink resources of the first device; the sending module is further used to, if the RSRP between the device and the first device is greater than the RSRP threshold, then the device sends data, signaling or random access signal to the second device through the first uplink communication connection; or,

[0178] The transceiver is further configured to, if the RSRP between the apparatus and the first device is less than the RSRP threshold, send data, signaling or random access signal to the second device through the second uplink communication connection; or,

[0179] The transceiver is further configured to, if the RSRP of the apparatus and the first device is equal to the RSRP threshold, cause the apparatus to send data, signaling, or a random access signal through the first uplink communication connection or the second uplink communication connection.

[0180] In an optional design of the thirteenth aspect, the first message further includes a first PCI and a second PCI;

[0181] The transceiver is further configured to receive a first primary synchronization signal PSS and a secondary synchronization signal SSS sent by the second device,

[0182] The first PSS and SSS correspond to the first PCI;

[0183] The transceiver is further configured to receive a second PSS and SSS sent by the third device, where the second PSS and SSS correspond to the second PCI;

[0184] The transceiver is specifically used to send the second message to the second device through the uplink resources of the second device if the first PCI strength is greater than the second PCI strength, the first PCI strength is the signal strength of the first PSS and SSS, and the second PCI strength is the signal strength of the second PSS and SSS.

[0185] In an optional design of the thirteenth aspect, the first message also includes measurement information, and the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength and / or the second PCI strength.

[0186] In an optional design of the thirteenth aspect, it is characterized in that the third message or the first message also includes SFN information, and the SFN information is used by the device to perform downlink frame synchronization with the second device according to the SFN information.

[0187] In an optional design of the thirteenth aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0188] In an optional design of the thirteenth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0189] In an optional design of the thirteenth aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a first downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0190] In an optional design of the thirteenth aspect, the first message also includes a tracking signal, and the tracking signal is used for the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0191] A fourteenth aspect of the present application provides a terminal, the terminal including a transceiver and a processor, the transceiver being configured to send a first message to the terminal, the first message including information about uplink resources of a second device, the uplink resources of the second device being used by the terminal to send a second message to the second device through the uplink resources of the second device;

[0192] The transceiver is used to send a third message to the terminal, where the third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0193] In an optional design of the fourteenth aspect, the first message also includes information about the reference signal received power RSRP threshold and the uplink resources of the first device. The uplink resources of the second device are used for the terminal to establish a first uplink communication connection with the second device based on the uplink resources of the second device. The uplink resources of the first device are used for the terminal to establish a second uplink communication connection with the first device based on the uplink resources of the first device. The RSRP threshold is used for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the target RSRP is equal to the RSRP threshold.

[0194] In an optional design of the fourteenth aspect, the first message further includes a first PCI and a second PCI;

[0195] The transceiver is also used to send a first primary synchronization signal PSS and a supplementary synchronization signal SSS to the terminal. The first PSS and SSS are used by the terminal to obtain a first PCI strength. The first PSS and SSS correspond to the first PCI. The first PCI strength is used to send a second message to the second device through uplink resources if the first PCI strength is greater than the second PCI strength. The second PCI strength is obtained by the terminal based on the second PSS and SSS sent by the second device. The second PSS and SSS correspond to the second PCI.

[0196] In an optional design of the fourteenth aspect, the first message also includes measurement information, where the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength and / or the second PCI strength.

[0197] In an optional design of the fourteenth aspect, the third message or the first message also includes SFN information, and the SFN information is used for the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0198] In an optional design of the fourteenth aspect, the apparatus is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0199] In an optional design of the fourteenth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0200] In an optional design of the fourteenth aspect, the first message also includes a tracking signal, and the tracking signal is used for the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0201] In an optional design of the fourteenth aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0202] In the fifteenth aspect of the present application, an access network device is provided, which terminal includes a transceiver and a processor, the transceiver is used to receive a second message sent by the terminal through the uplink resources of the second device, and the uplink resources of the second device are obtained by the terminal from the first message sent by the first device.

[0203] The transceiver is used to send a confirmation message to the first device, and the confirmation message is used to enable the first device to send a third message to the terminal, and the third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0204] In an optional design of the fifteenth aspect, the first message also includes information about the reference signal received power RSRP threshold and the uplink resources of the first device. The uplink resources of the second device are used for the terminal to establish a first uplink communication connection with the second device based on the uplink resources of the second device. The uplink resources of the first device are used for the terminal to establish a second uplink communication connection with the first device based on the uplink resources of the first device. The RSRP threshold is used for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the second device through the second uplink communication connection if the target RSRP is equal to the RSRP threshold.

[0205] In an optional design of the fifteenth aspect, the first message further includes a first PCI and a second PCI;

[0206] The transceiver is also used to send a second primary synchronization signal PSS and a supplementary synchronization signal SSS to the terminal. The second PSS and SSS are used by the terminal to obtain a second PCI strength. The second PSS and SSS correspond to the second PCI. The second PCI strength is used to send a second message to the second device through uplink resources if the first PCI strength is greater than the second PCI strength. The first PCI strength is obtained by the terminal based on the first PSS and SSS sent by the first device. The first PSS and SSS correspond to the first PCI.

[0207] In an optional design of the fifteenth aspect, the first message also includes measurement information, and the measurement information is used to indicate a triggering event for the terminal to obtain the first PCI strength and / or the second PCI strength.

[0208] In an optional design of the fifteenth aspect, the third message or the first message also includes SFN information, and the SFN information is used for the terminal to perform downlink frame synchronization with the second device according to the SFN information.

[0209] In an optional design of the fifteenth aspect, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna.

[0210] In an optional design of the fifteenth aspect, the first message also includes a cell identifier of the second device and a cell identifier of the third device.

[0211] In an optional design of the fifteenth aspect, the first message also includes a tracking signal, and the tracking signal is used for the terminal to perform downlink fine synchronization with the second device according to the tracking signal.

[0212] In an optional design of the fifteenth aspect, the third message also includes information about the downlink resources of the first device, and the downlink resources of the first device are used by the terminal to establish a second downlink communication connection with the first device based on the downlink resources of the first device, and the first downlink communication connection and the second downlink communication connection are used to transmit data to the terminal in a CA manner.

[0213] In the sixteenth aspect, the present application provides an access network device, which includes a memory and a processor. The processor calls the program code stored in the memory to execute the method of the aforementioned fifth aspect or any one of the optional designs of the fifth aspect.

[0214] In the seventeenth aspect, the present application provides an access network device, which includes a memory and a processor. The processor calls the program code stored in the memory to execute the method of the aforementioned third aspect or any optional design of the third aspect.

[0215] In the eighteenth aspect of the present application, an access network device is provided, which terminal includes a memory and a processor, and the processor calls the program code stored in the memory to execute the method of the aforementioned sixth aspect or any one of the optional designs of the sixth aspect.

[0216] The nineteenth aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on a computer, the computer executes the method of the aforementioned first aspect or any one of the optional designs of the first aspect.

[0217] The twentieth aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on the computer, the computer executes the method of the aforementioned fourth aspect or any one of the optional designs of the fourth aspect.

[0218] The twenty-first aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on the computer, the computer executes the method of the aforementioned second aspect or any one of the optional designs of the second aspect.

[0219] The twenty-second aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on the computer, the computer executes the method of the aforementioned fifth aspect or any one of the optional designs of the fifth aspect.

[0220] The twenty-third aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on the computer, the computer executes the method of the aforementioned third aspect or any one of the optional designs of the third aspect.

[0221] The twenty-fourth aspect of the present application provides a computer storage medium, characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on the computer, the computer executes the aforementioned sixth aspect or any one of the optional designs of the sixth aspect.

[0222] The twenty-fifth aspect of the present application provides a computer program product, characterized in that when the computer program product is executed on a computer, it enables the computer to execute the method of the aforementioned first aspect or any optional design of the first aspect.

[0223] The twenty-sixth aspect of the present application provides a computer program product, characterized in that when the computer program product is executed on a computer, it enables the computer to execute the method of the aforementioned first aspect or any one of the optional designs of the first aspect.

[0224] The twenty-seventh aspect of the present application provides a computer program product, characterized in that when the computer program product is executed on a computer, it enables the computer to execute the method of the aforementioned second aspect or any optional design of the second aspect.

[0225] The twenty-eighth aspect of the present application provides a computer program product, characterized in that when the computer program product is executed on a computer, it enables the computer to execute the method of the aforementioned first aspect or any optional design of the first aspect.

[0226] The twenty-ninth aspect of the present application provides a computer program product, characterized in that when the computer program product is executed on a computer, it enables the computer to execute the method of the aforementioned third aspect or any optional design of the third aspect.

[0227] The thirtieth aspect of the present application provides a computer program product, characterized in that when the computer program product is executed on a computer, it enables the computer to execute the method of the aforementioned first aspect or any one of the optional designs of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0228] Figure 1 This is a schematic diagram of the network architecture in an embodiment of the present application;

[0229] Figure 2 This is a schematic diagram of the random access process in an embodiment of the present application;

[0230] Figure 3 A schematic diagram of a process for establishing a communication connection in an embodiment of the present application;

[0231] Figure 4 A schematic diagram of the division of spectrum resources for establishing a communication connection in an embodiment of the present application;

[0232] Figure 5a This is another schematic diagram of a process for establishing a communication connection in an embodiment of the present application;

[0233] Figure 5b This is another schematic diagram of a process for establishing a communication connection in an embodiment of the present application;

[0234] Figure 6a This is another schematic diagram of a process for establishing a communication connection in an embodiment of the present application;

[0235] Figure 6b This is another schematic diagram of a process for establishing a communication connection in an embodiment of the present application;

[0236] Figure 7 This is another schematic diagram of a process for establishing a communication connection in an embodiment of the present application;

[0237] Figure 8 A schematic diagram of the structure of an apparatus for establishing a communication connection in an embodiment of the present application;

[0238] Figure 9 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application;

[0239] Figure 10 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application;

[0240] Figure 11This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application;

[0241] Figure 12 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application;

[0242] Figure 13 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application;

[0243] Figure 14 This is a schematic diagram of the structure of a terminal in an embodiment of the present application;

[0244] Figure 15 This is a structural diagram of the access network device in an embodiment of the present application. DETAILED DESCRIPTION

[0245] The embodiments of the present application provide a method, apparatus, and related equipment for establishing a communication connection, which, when applied to the communication field, can save broadcast resources of a second device. The second device may not even need to broadcast public messages, thereby reducing energy consumption of the second device.

[0246] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0247] It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), world wide inter operability for microwave access (WiMAX) communication system or future fifth generation mobile communication technology (5G) system, etc.

[0248] In order to better understand the method for establishing a communication connection in the embodiment of the present application, the network framework of the embodiment of the present application is described below.

[0249] See also Figure 1 , Figure 1 Schematic diagram of the network architecture in an embodiment of the present application.

[0250] The network includes: a terminal 101 , a first device 102 , a second device 103 and a core network device 104 .

[0251] The terminal 101 generally refers to a device capable of communicating with network devices, such as an access terminal device, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal device, a mobile device, a user terminal device, a wireless terminal device, a user agent, or a user device. It may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device, other processing devices connected to a wireless modem, an in-vehicle device, a wearable device (smart watch, smart bracelet, etc.), smart furniture (or home appliance), a terminal device in a future 5G network, a terminal device in a future evolved public land mobile network (PLMN), a vehicle device in a vehicle-to-everything (V2X) network, or customer premises equipment (CPE). The terminal 101 and the first device 102 communicate with each other using a certain air interface technology.

[0252] The core network device 104 is used to provide user connection, user management and service carrying. For example, the establishment of user connection includes functions such as mobility management (MM) and paging. User management includes user description, QoS, and security (the corresponding security measures provided by the authentication center include security management of mobile services and security processing of external network access). Bearer connections include external public switched telephone networks (PSTN), external circuit data networks and packet data networks, the Internet, etc. For example, the core network device 104 can be an access and mobility management function (AMF), which is mainly responsible for the signaling processing part, that is, the control plane function, including access control, mobility management, attachment and detachment, and gateway selection. The core network device 104 involved in the embodiment of the present invention is not limited to AMF.

[0253] The first device 102 and the second device 103 may be used to implement functions such as wireless physical entities, resource scheduling and wireless resource management, wireless access control, and mobility management. For example, the first device 102 and the second device 103 may be radio access network (RAN) devices. The radio access network device can be an access network device (base transceiver station, BTS) in a GSM or code division multiple access (CDMA) system, a node B (NB) in a wideband code division multiple access (WCDMA) system, an evolved node B (eNB) in a long term evolution (LTE) system, a wireless controller in a cloud radio access network (CRAN) scenario, a relay node station, a transmission reception point (TRP), an access point, a vehicle-mounted device, a road side unit (RSU), a wearable device, a network device in a future 5G network, such as an NR nodeB, a next-generation access network device (gNB), a centralized unit (CU), a distributed unit (DU), or a network device in a future evolved public land mobile network (PLMN), etc.

[0254] In this embodiment of the present application, the first device 102 and the second device 103 are different access network devices or different antennas within the same access network device, or different antenna arrays 2, or different radio frequency units, or different active antenna units. Different antennas / radio frequency units refer to antennas that use different spectrum resources. For example, the first device 102 may be a 4G antenna and the second device 103 may be a 5G antenna, or the first device 102 may be an antenna that supports both 4G and 5G, and the second device 103 may be a 5G antenna.

[0255] A terminal needs to connect to the network through a first device or a second device. Each radio access network device can serve one or more cells. Multiple cells served by a radio access network device can be deployed in the same or different frequencies. Typically, each serving cell in the network is independent of each other, meaning it also has independent public signaling, such as the Master Information Block (MIB), System Information Block (SIB) messages, and paging messages. Broadcast system information (MIB and SIB1) contains cell selection parameters for each cell in the radio access network device. The terminal measures the RSRP of the radio channel and calculates the measured cell reception level for each cell. It then obtains other cell parameters and related minimum cell reception level requirements from public information to calculate a cell selection reception level for each cell. If a cell selection reception level value exceeds a certain threshold, the cell is considered a candidate cell and a suitable camping cell is selected from the candidate cells based on the public information. After camping on a cell, the terminal begins the random access process, which can include contentious random access and non-contentious random access.

[0256] Energy consumption is a major concern in current communications network deployments, with electricity costs consistently accounting for a significant portion of operators' operating costs. RF modules account for 80%-90% of the energy consumption of access network equipment, making reducing RF module energy consumption a key research priority.

[0257] A typical method for reducing RF module energy consumption is symbol shutdown. Symbol shutdown involves the access network device shutting down the power amplifier during symbol periods when no data is being transmitted, thereby reducing system power consumption. When the access network device detects a symbol without data in the time domain, it shuts down the power to the amplifier and related hardware, reducing static power consumption. For example, when the access network device is busy, the PA needs to be constantly on. However, when no data is being transmitted, the PA can be briefly shut down for energy savings. The energy savings achieved by symbol shutdown depend on the duration the amplifier and related hardware are shut down, i.e., the ratio of symbols without data to all symbols. However, since every cell broadcasts common channels, including synchronization signal blocks (SSBs), SIB1, and Paging messages, common channel broadcasts cannot be stopped even in time slots without data transmission. This means that the ratio of symbols without data to all symbols cannot reach 100%, limiting the energy savings achieved by symbol shutdown. The reasons why cells cannot stop common channel broadcasts are as follows:

[0258] For the terminal to enter the above-mentioned random access process with the second device, it must complete processes such as cell search, downlink frame synchronization, and cell camping. These processes require the second device to periodically broadcast public messages on a public channel, such as SIB1, SSB, or Paging messages. In the embodiment of the present application, it is desired to conserve the broadcast resources of the second device, and the second device may even not broadcast public messages. Therefore, the terminal cannot establish a communication connection with the second device through the above-mentioned random access process.

[0259] Furthermore, as capacity experience drives network construction, network thickness continues to increase. Network capacity redundancy during off-peak hours continues to increase. This network stacking, like building blocks, leads to the persistent presence of public channel broadcasts across frequency bands. For example, public channel broadcasts previously existed simultaneously on 3G and 4G networks, but now they exist simultaneously on 3G, 4G, and 5G networks. The overhead of public channel broadcasts across frequency bands is compounded, further increasing energy consumption.

[0260] To this end, embodiments of the present application provide a method for establishing a communication connection. In this method, a terminal is within the communication coverage of both a first device and a second device. The second device reduces the number of broadcasts on a common channel or does not broadcast common messages. The terminal uses the common message broadcast by the first device to complete processes such as cell search, downlink frame synchronization, and cell camping. It then obtains uplink resources from the second device through the first device, thereby completing the random access process and ultimately establishing a communication connection between the terminal and the second device. Furthermore, this method is compatible with symbol switching. In particular, when symbol switching is used simultaneously with the method for establishing a communication connection provided in embodiments of the present application, the ratio of symbols without data to all symbols can theoretically reach 100%, thereby enhancing the energy-saving effect of symbol switching. Furthermore, the energy-saving benefit of symbol switching depends on the ratio of symbols without data to all symbols, and therefore the energy-saving benefit is unstable. The method for establishing a communication connection provided in embodiments of the present application can enable the second device to permanently switch off certain symbols among all symbols, thereby stabilizing the energy-saving benefit. The following describes establishing a communication connection in embodiments of the present application. For example, features or content marked with dashed lines in the figures related to embodiments of the present application can be understood as optional operations or optional structures of the embodiments. It should be noted that in the embodiment of the present application, the second device may reduce the public channel broadcast or may not broadcast public information through the public channel. For the convenience of description, the following will be described as an example in which the second device does not broadcast public information through the public channel.

[0261] Figure 2 A schematic diagram of a process for establishing a communication connection in an embodiment of the present application.

[0262] See also Figure 2 In step 201, the first device sends a first message to the terminal.

[0263] The first message includes information about the uplink resources of the second device, which are used for initial access by the terminal. In this embodiment of the present application, because the second device does not broadcast public information via a public channel, the terminal cannot directly establish a communication connection with the second device, that is, the terminal cannot directly obtain the uplink resources of the second device. In this case, the present application obtains the uplink resources of the second device through the first device.

[0264] In step 202, the terminal sends a second message to the second device.

[0265] After the terminal obtains the uplink resources of the second device through the first message, the terminal sends a second message to the second device through the uplink resources of the second device. The second message can be an RRC establishment request message in random access. To facilitate understanding of the second message and the third message provided in the embodiment of the present application, the random access process in the embodiment of the present application is described below. It should be noted that the random access process is only an example. In actual applications, partial changes to the process, such as changing the channel for transmitting signaling or changing the content of the signaling, should fall within the scope of protection of the present invention. Figure 3 Schematic diagram of the random access process in the embodiment of the present application.

[0266] See also Figure 3 In step 301, the terminal sends a random access preamble to the first device.

[0267] The terminal sends a random access prefix (RACH) to the first device on a random access channel (RACH), which carries a preamble code, enabling the first device to estimate the transmission delay between the first device and the terminal. The RACH is an uplink transmission channel that carries limited control information and has collision characteristics.

[0268] In step 302, the first device sends a random access response to the terminal.

[0269] After receiving the random access preamble, the first device generates a random access response (RAR) at the MAC layer and sends the RAR to the terminal on the downlink frame synchronization channel (DL-SCH). The RAR includes: a random access preamble identifier, uplink resources allocated for the radio resource control (RRC) establishment request message, a cell-radio network temporary identifier (C-RNTI), etc.

[0270] In step 303, the terminal sends an RRC establishment request message to the first device.

[0271] DL-SCH is a broadcast channel. After the terminal receives the random access response, it needs to determine whether the RAR is its own RAR, for example, by using the preamble ID for verification. After the terminal determines that the RAR is its own RAR, the RRC layer of the terminal generates an RRC establishment request message and maps it to the common control channel (CCCH) on the downlink frame synchronization channel (up link-synchroIluauon channel, UL-SCH) to send the RRC establishment request message to the first device. The RRC establishment request message carries the terminal's identifier (ID). The RRC establishment request message is mainly used to request an RRC connection from the first device and to transmit the RRC handover completion message and C-RNTI generated by the RRC layer.

[0272] In step 304, the first device sends an RRC establishment message to the terminal.

[0273] In step 201, a conflict occurs when multiple terminals use the same preamble sequence simultaneously. A terminal can prepare for an RRC connection only after receiving its own RRC setup message. The RRC setup message is generated by the RRC layer of the first device and sent on the CCCH or dedicated control channel (DCCH) mapped to the DL-SCH.

[0274] In step 305, the terminal sends an RRC establishment completion message to the first device.

[0275] After receiving the RRC setup message, the terminal sends an RRC setup complete message to the first device. If, in step 201, the reason why the terminal sends the random access preamble to the first device is to send a service request, the RRC setup complete message includes the service request.

[0276] After the first device sends an RRC establishment message to the terminal, that is, after the terminal performs random access, if the network side needs to send data or signaling, the first device can send an RRC reconfiguration message to the terminal for data plane bearer configuration, etc.

[0277] It should be determined that Figure 2 In the flowchart, the second message, i.e., the RRC setup request message, is received by the second device instead of the first device. Conversely, if the first message instructs the terminal to send an uplink measurement signal to the second device and the third device, the terminal may send the second message to the first device instead of the second device.

[0278] See also Figure 2 In step 203, the second device sends a confirmation message to the first device.

[0279] The confirmation message notifies the first device that the second device has received the second message from the second device. After the terminal receives the downlink resource information from the second device, it establishes a downlink communication connection with the second device based on the downlink resources of the second device. After the downlink communication connection is established, the terminal can receive downlink data sent by the second device via the downlink communication connection. It should be noted that if the second message is transparently transmitted to the fourth device via the second device, step 203 may not be performed. If step 203 is not performed, the first device can receive the third message sent by the fourth device, which may be a BBU.

[0280] In step 204, the first device sends a third message to the terminal.

[0281] The third message includes information about the downlink resources of the second device. After receiving the third message, the terminal establishes a downlink communication connection with the second device based on the downlink resources of the second device in the third message. After the downlink communication connection is established, the terminal can receive downlink data from the second device. The third message can be an RRC reconfiguration message after random access. It is understood that the cell identifier corresponding to the downlink resource information of the second device can be different from the cell identifier broadcast by the first device.

[0282] The above describes how to establish a first downlink communication connection between a terminal and a second device when the second device does not broadcast a public message. In actual applications, the terminal may also establish a first uplink communication connection with the second device, and a second uplink communication connection and a second downlink communication connection with the first device. The second downlink communication connection and the first downlink communication connection transmit data to the terminal via a call-connection (CA) mechanism, with the first uplink communication connection serving as the SUL for the second uplink communication connection. This is described below.

[0283] First, let's explain the division of spectrum resources between the first device and the second device. Figure 4 , Figure 4 Schematic diagram of the division of spectrum resources for establishing a communication connection in an embodiment of the present application. Figure 4In this example, the first device is a radio frequency unit in an LTE network, and the second device is a radio frequency unit in a 5G network. The center frequency of the spectrum resources used by the first device is 1.8 GHz. The uplink spectrum resources in the first device are LTE UL405, and the downlink spectrum resources are LTE DL403 and NR DL404. The center frequency of the spectrum resources used by the second device is 3.5 GHz. The uplink spectrum resources in the second device are NR UL, and the downlink spectrum resources are NR DL401. LTE UL405 and LTE DL403 form a 1.8 GHz LTE cell.

[0284] Optionally, there is also an uplink spectrum NR UL406 in the first device, and the NR UL406 and the NR DL404 form a cell. The uplink spectrum resource NR UL406 in the second device can be considered as the SUL of the cell corresponding to the NR DL404.

[0285] It can be understood that the first device can be a NR radio frequency unit, that is, it only includes NR uplink resources and NR downlink resources, but does not include uplink and downlink resources of the LTE standard, which is not limited here.

[0286] Optionally, the second downlink communication connection established between NR DL404 and the terminal and the first downlink communication connection established between NR DL401 and the terminal transmit data to the terminal via CA.

[0287] Next, the process of establishing a communication connection in the embodiment of the present application is described. Figure 4, assuming that a 1.8GHz LTE cell consisting of LTE UL405 and LTE DL403 is cell1, and a NR cell consisting of NR DL404 and NRUL406 is cell2. Cell2 can serve as the terminal's Pcell, and cell3, where NR DL401 is located, serves as the terminal's Scell. Cell2 provides SUL services for the terminal, and the cell where NR DL401 is located is cell3, which provides DL services for the terminal. After the terminal resides in cell 2, the cell providing DL services for the terminal, in addition to cell 2, can be determined or undetermined. The cell providing DL services for the terminal can be determined, which can be understood as a core network device, a first device, or a second device designating cell 3 as the terminal's DL service, or only the signal coverage of the second device overlaps with the signal coverage of the first device, or the terminal is informed through a broadcast message that the second device's cell can be used as the terminal's DL service cell. For example, when the first device and the second device are a 4G antenna and a 5G antenna in the same access network device. Through power regulation, the signal coverage range of the 4G antenna and the signal coverage range of the 5G antenna are roughly the same. In this case, cell 3 formed by the 5G antenna can be considered the cell providing DL services for the terminal. If the cell that can provide DL services for the terminal is uncertain, there may be multiple cells that can provide DL services for the terminal. Therefore, it is necessary to select a cell from these multiple cells to provide DL services for the terminal. These two situations are described separately below.

[0288] See also Figure 5a , Figure 5a This is another flow chart of establishing a communication connection in an embodiment of the present application. Figure 5a Among them, cell 3 that can provide DL service to the terminal is determined.

[0289] In step 501, the first device sends an SSB or SIB1 message to the terminal.

[0290] After the terminal resides in cell 2, the terminal receives an SSB or SIB1 message sent by the first device. The SSB or SIB1 message includes information about the uplink resources of the second device, and the uplink resources of the second device are used for initial access of the terminal. In an embodiment of the present application, because the second device does not broadcast public information through a public channel, the terminal cannot directly establish a communication connection with the second device, that is, the terminal cannot directly obtain the uplink resources of the second device, such as uplink random access resources. In this case, the present application obtains the uplink resources of the second device through the first device. The uplink resources of the second device may include an accessible RACH sequence.

[0291] In step 502, the terminal sends an RRC establishment request message to the second device.

[0292] After the terminal obtains the uplink resources of the second device through the SSB or SIB1 message sent by the first device, the terminal sends an RRC establishment request message to the second device through the uplink resources of the second device.

[0293] In step 503, the second device uses cell3 as the downlink Scell ​​of cell2.

[0294] After receiving the RRC setup request message sent by the terminal, the second device uses cell 3 as the downlink Scell ​​of cell 2. This process may be an internal process of the second device and only needs to be completed before step 508.

[0295] In step 504, the second device sends a confirmation message of the RRC establishment request message to the first device.

[0296] This confirmation message is used to inform the first device that the second device has received the RRC establishment request message sent by the terminal. In particular, to be compatible with the relevant random access procedure and reduce the modification of the signaling content, the confirmation message can be an RRC establishment request message, that is, the second device forwards the received RRC establishment request message to the first device. It should be determined that if the first device and the second device are different antennas / RF units in the same access network device, step 504 may not be performed.

[0297] In step 505, the first device sends an RRC establishment message to the terminal.

[0298] In step 506, the terminal sends an RRC establishment completion message to the second device.

[0299] The description of step 505 can refer to the aforementioned Figure 3 For the description of step 304 and step 506, please refer to the above Figure 3 The relevant description of step 305 in FIG. It should be determined that in the aforementioned Figure 3 In the related description, the sender of the RRC setup message and the receiver of the RRC setup complete message are the same antenna of the same device. In the embodiment of the present application, the sender of the RRC setup message is the first device, and the receiver of the RRC setup complete message is the second device.

[0300] In step 507, the second device sends a confirmation message of the RRC setup completion message to the first device.

[0301] The confirmation message is used to inform the first device that the second device has received the RRC setup complete message sent by the terminal. Specifically, the confirmation message can be an RRC setup complete message, i.e., the second device forwards the received RRC setup request message to the first device. It should be noted that if the first device and the second device are different antennas / RF units in the same access network device, step 507 may not be performed.

[0302] In step 508, the first device sends RRC reconfiguration information to the terminal.

[0303] The first device sends an RRC reconfiguration message to the terminal. The RRC reconfiguration message includes information about the downlink resources of the second device. After receiving the RRC reconfiguration message, the terminal establishes a first downlink communication connection with the second device based on the downlink resources of the second device. After establishing the first downlink communication connection with the second device, the terminal can receive downlink data from the second device from cell 3.

[0304] Optionally, the SSB or SIB1 message of step 501 also includes information about the uplink resources of the first device. After the terminal receives the SSB or SIB1 message, the terminal can initiate an uplink access process to the first device from the uplink spectrum resources corresponding to cell2, such as 1.8G low-frequency uplink spectrum resources. The uplink resource information of the first device is used as the UL resource of the terminal, and the uplink resource information of the second device is used as the SUL resource of the terminal. When the SSB or SIB1 message also includes an RSRP threshold, the terminal determines whether to select UL or SUL to transmit data or signaling or to initiate a random access process based on the RSRP threshold. The specific selection method includes any one or more of the following methods.

[0305] 1. If the RSRP of the terminal and the first device is greater than the RSRP threshold, the terminal selects SUL to transmit data or signaling or initiates a random access process.

[0306] 2. If the RSRP of the terminal and the first device is less than the RSRP threshold, the terminal selects UL transmission data or signaling or initiates a random access process.

[0307] 3. If the RSRP of the terminal and the first device is equal to the RSRP threshold, the terminal selects SUL or UL to transmit data or signaling or initiates a random access process.

[0308] Optionally, the above specific selection method is called method 1. In addition to the above method 1, the terminal can also use the RSRP threshold in method 2. Method 2 is:

[0309] 1. If the RSRP of the terminal and the first device is greater than the RSRP threshold, the terminal selects UL transmission data or signaling or initiates a random access process.

[0310] 2. If the RSRP of the terminal and the first device is less than the RSRP threshold, the terminal selects SUL to transmit data or signaling or initiates a random access process.

[0311] 3. If the RSRP of the terminal and the first device is equal to the RSRP threshold, the terminal selects SUL or UL to transmit data or signaling or initiates a random access process.

[0312] about Figure 5a For the corresponding description, please refer to Figure 2 and Figure 3 For example, step 501 can refer to the above description. Figure 2 Step 201 in Figure 5a The RRC establishment request message in the above can refer to Figure 3 RRC establishment request message in.

[0313] Optionally, the SSB or SIB1 message also includes indication information, which is used to indicate whether the terminal adopts method 1 or method 2 to decide on uplink resources for sending data, signaling, or initiating a random access process, and the uplink resources include the above-mentioned UL and SUL.

[0314] In another embodiment, if the terminal has only high-frequency uplink resources, that is, only uplink resources corresponding to the second device, the RSRP threshold can be used by the terminal to determine whether to perform random access on the uplink resources corresponding to the second device. For example, if the RSRP of the terminal and the first device is greater than or equal to the RSRP threshold, the terminal selects the uplink resources corresponding to the second device to transmit data or signaling or initiate a random access process.

[0315] Optionally, the RRC reconfiguration message also includes SFN information of the second device, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device based on the SFN information. In the case where the second device does not broadcast on a common channel, the terminal may not be able to complete the downlink frame synchronization with the second device through the broadcast information of the second device. Through the SFN information in the RRC reconfiguration message, the terminal can complete the downlink frame synchronization with the second device, thereby improving the success rate of data transmission. The SFN may be the SFN value of the second device. The SFN information may also be the time deviation between the first device and the second device (for example, the SFN difference). Since the terminal has already performed downlink frame synchronization with the first device, the terminal can achieve downlink frame synchronization with the second device after obtaining the time deviation between the first device and the second device. It is understandable that the SFN information may also be included in the SSB or SIB1 message of the above step 501.

[0316] It is understandable that the SFN information of the second device may also be included in an SSB or SIB1 message. It is understandable that the SFN information of the second device may also be included in other system messages, such as SIB2, SIB3, etc., which are not limited here.

[0317] Optionally, before or after sending the RRC reconfiguration message, the network side, for example, the second device or the first device, further sends a tracking signal to the terminal. The tracking signal is used for the terminal to perform downlink fine synchronization with the second device. If the second device does not broadcast on a common channel, the terminal cannot complete downlink fine synchronization with the second device through the broadcast information of the second device. Using the tracking signal in the first message, the terminal can complete downlink fine synchronization with the second device, thereby improving the reliability of data transmission.

[0318] Optionally, the RRC reconfiguration message also includes information about the downlink resources of the first device. After receiving the RRC reconfiguration message, the terminal establishes a second downlink communication connection with the first device based on the downlink resources of the first device. After establishing the second downlink communication connection with the first device, the terminal can receive downlink data from the first device from cell 2. The second downlink communication connection and the first downlink communication connection are used to transmit data to the terminal in a CA manner.

[0319] Optionally, the first device is a low-frequency base station or a low-frequency antenna, and the second device is a high-frequency base station or a high-frequency antenna. Among them, low frequency and high frequency are relative. When the center frequency of the spectrum resources used by the second base station is greater than the center frequency of the spectrum resources used by the first base station, the second device can be considered to be a high-frequency base station and the first device is a low-frequency base station. Under the same transmission power, the signal coverage range of the high-frequency base station is smaller than the signal coverage range of the low-frequency base station. Therefore, if the same area needs to be covered, the number of high-frequency base stations needs to be greater than the number of low-frequency base stations. By reducing or shutting down the public channel broadcast of the high-frequency base station, more energy consumption can be reduced compared to shutting down or reducing the public channel broadcast of the low-frequency base station.

[0320] Optionally, steps 504 and 507 may not be performed. Figure 5b , Figure 5b This is another flow chart of establishing a communication connection in an embodiment of the present application. Figure 5bIn this example, steps 504 and 507 are not performed. In step 502, the terminal transparently transmits an RRC establishment request message to the fourth device via the second device. After the fourth device receives the RRC establishment request message sent by the terminal, it transparently transmits the RRC establishment message to the terminal via the first device in step 505. After the terminal receives the RRC establishment message, in step 503, the fourth device uses cell3 as the downlink Scell ​​of cell2. In step 506, it transparently transmits an RRC establishment complete message to the fourth device via the second device. After receiving the RRC establishment complete message, the fourth device transparently transmits an RRC reconfiguration message to the terminal via the first device in step 508. The above describes the case where the cell providing DL service for the terminal is certain. The following describes the case where the cell providing DL service for the terminal is uncertain. When the cell providing DL service for the terminal is uncertain, it is necessary to determine a target serving cell from multiple cells. There are two ways to determine the target serving cell. The first way is that multiple devices in multiple cells send measurement information separately. The terminal obtains multiple signal strengths from the multiple measurement information. The terminal then determines the device corresponding to the target serving cell based on the multiple signal strengths. The second method is that the terminal sends measurement information, and multiple devices in multiple cells respectively obtain multiple signal strengths from the measurement information. A device among the multiple devices or a core network device determines the device corresponding to the target serving cell based on the multiple signal strengths. The following describes each of these two methods.

[0321] See also Figure 6a , Figure 6a This is another flow chart of establishing a communication connection in an embodiment of the present application. Figure 6a In this scenario, the cell that can provide DL services to a terminal is uncertain, and multiple devices transmit measurement information, including the PSS and SSS. For ease of explanation, the multiple devices herein include a second device and a third device. The second and third devices may be different access network devices or different antennas, antenna arrays, or radio frequency units within the same access network device. The fourth device may be a BBU.

[0322] In step 601, the first device sends an SSB or SIB1 message to the terminal.

[0323] The SSB or SIB1 message includes the first PCI, the second PCI, the uplink resources of the second device, and the uplink resources of the third device.

[0324] Optionally, the SSB or SIB1 message also includes a correspondence between PCIs and uplink resources. For example, the correspondence may be: the first PCI corresponds to the uplink resources of the second device, and the second PCI corresponds to the uplink resources of the third device. It is understood that the above correspondence may be in the form of an implication, such as sending the PCI and the uplink resources together, or implied by the order of arrangement, or may be in an explicit manner, such as through indication information.

[0325] It is understandable that the correspondence between the PCI and the uplink resources may also be included in other system messages, such as SIB2, SIB3, etc., which is not limited here.

[0326] Optionally, the SSB or SIB1 message also includes measurement information, and the measurement information is used to indicate a trigger event for the terminal to obtain the first PCI strength and / or the second PCI strength, where the first PCI strength is the downlink signal strength of the cell corresponding to the first PCI, and the second PCI strength is the downlink signal strength of the cell corresponding to the second PCI. The trigger event is a measurement event, and the measurement event indicates how long after receiving the SSB or SIB1 message the terminal starts and / or ends measuring the first PSS and SSS sent by the second device, or specifies that as long as the terminal resides in cell2, it needs to measure the signal strength of the cell corresponding to the frequency band of the second device to obtain the first PCI strength and / or the second PCI strength, or specifies that when the downlink RSRP signal strength of cell2 measured by the terminal is higher than a certain threshold, it needs to measure the signal of the cell of the second device and / or the third device. It can also be other measurement events, which are not limited here.

[0327] Optionally, the SSB or SIB1 message also includes a cell identifier of the second device and a cell identifier of the third device. It is understandable that including these two cell identifiers means that the first device is a shared device. Optionally, the SSB or SIB1 message also indicates the correspondence between the cell identifiers and the SUL resources.

[0328] In step 602, the third device sends a second PSS and SSS to the terminal.

[0329] The third device broadcasts a public message on a public channel, where the public message includes a second PSS and SSS. Optionally, the public message is a simplified version of the public message. For example, when the public message is an SSB, the SSB includes a PSS, an SSS, and an MIB. The MIB may carry less data or no data, thereby obtaining a simplified version of the SSB. It is understandable that the simplified version of the SSB may include only the PSS and SSS. It is understandable that the terminal may perform link evaluation based on the received PSS and SSS information, and perform uplink power selection based on the link evaluation.

[0330] In step 603, the second device sends the first PSS and SSS to the terminal.

[0331] For a detailed description of step 603 , please refer to the description of step 602 .

[0332] In step 604, the terminal obtains a first PCI strength of the first PSS and SSS, and a second PCI strength of the second PSS and SSS.

[0333] The first PCI corresponds to the first PSS and SSS, the second PCI and the second PSS correspond to the SSS, the first PCI strength is the downlink signal strength of the cell corresponding to the first PCI, and the second PCI strength is the downlink signal strength of the cell corresponding to the second PCI. After the terminal obtains the first PCI strength and the second PCI strength, based on the correspondence in the SSB or SIB1 message (the correspondence between PCI and uplink resources), as well as the correspondence between the first PCI and the first PSS and SSS, and the correspondence between the second PCI and the second PSS and SSS, it can be concluded that the first PCI strength corresponds to the uplink resources of the second device, and the second PCI strength corresponds to the uplink resources of the third device. When the first PCI strength is greater than the second PCI strength, the terminal sends an RRC establishment request message to the second device or performs a random access procedure or sends uplink data through the uplink resources of the second device; when the second PCI strength is greater than the first PCI strength, the terminal sends an RRC establishment request message to the third device or performs a random access procedure or sends uplink data through the uplink resources of the third device; when the second PCI strength is equal to the first PCI strength, the terminal sends an RRC establishment request message or performs a random access procedure or sends uplink data through the uplink resources of the third device or the uplink resources of the second device.

[0334] In step 605, the terminal sends an RRC establishment request message to the fourth device through the second device.

[0335] If the first PCI strength is greater than the second PCI strength, the terminal transparently transmits the RRC setup request message to the fourth device via the second device. If the second PCI strength is greater than the first PCI strength, the terminal transparently transmits the RRC setup request message to the fourth device via the third device. In step 606, the fourth device uses cell 3 as the downlink Scell ​​of cell 2.

[0336] In step 607, the fourth device sends a confirmation message of the RRC establishment request message to the first device through the second device.

[0337] In step 608, the terminal sends an RRC establishment completion message to the fourth device through the second device.

[0338] In step 609, the fourth device sends RRC reconfiguration information to the terminal through the first device.

[0339] about Figure 6a The description can refer to the above Figure 5a and Figure 5b For example, step 605 can refer to step 502, and the RRC establishment message in step 607 can refer to the RRC establishment message in step 505. In particular, Figure 5b Any optional technical solution in Figure 6a The corresponding references can be made in .

[0340] Optionally, the method for establishing a communication connection provided in the embodiment of the present application can also be implemented without including the fourth device. Figure 6b , Figure 6b This is another flow chart of establishing a communication connection in an embodiment of the present application. Figure 6b In, not including Figure 6a The fourth device in the embodiment is described above, but steps 610 and 611 are added. Furthermore, in step 605, the terminal does not transparently transmit the RRC establishment request message to the fourth device via the second device, but instead sends the RRC establishment request message to the second device. After the second device receives the RRC establishment request message, in step 606, it uses cell3 as the downlink Scell ​​of cell2. In step 610, the second device sends a confirmation message of the RRC establishment request message to the first device based on the received RRC establishment request message. Optionally, the request message is an RRC establishment request message. In the absence of the fourth device, after the first device receives the confirmation message of the RRC establishment request message, in step 607, it sends an RRC establishment message to the terminal. In step 608, the terminal does not transparently transmit the RRC establishment complete message to the fourth device via the second device, but instead sends an RRC establishment complete message to the second device. After the second device receives the RRC establishment complete message sent by the terminal, in step 611, the second device sends a confirmation message of the RRC establishment complete message to the first device. Optionally, the confirmation message of the RRC establishment complete message is an RRC establishment complete message. After the first device receives the RRC establishment completion message, the first device sends an RRC reconfiguration message to the terminal.

[0341] about Figure 6b The description can refer to the above Figure 5a For example, step 605 can refer to step 502, and the RRC establishment message in step 607 can refer to the RRC establishment message in step 505. In particular, Figure 5a Any optional technical solution in Figure 6a The corresponding references can be made in .

[0342] The above describes the situation where multiple devices send measurement information separately. The following describes the situation where a terminal sends measurement information. Figure 7 , Figure 7 This is another flow chart of establishing a communication connection in an embodiment of the present application. Figure 7 In this example, the cell providing DL services to the terminal is uncertain, and the terminal sends measurement information to multiple devices. For ease of explanation, the multiple devices here include the second device and the third device. The second device and the third device are different access network devices or different antennas in the same access network device.

[0343] In step 701, the first device sends an SSB or SIB1 message to the terminal.

[0344] Optionally, the SSB or SIB1 message includes information for instructing the terminal to send an uplink measurement signal to the second device and the third device. The uplink measurement signal can be an SRS, a physical random access channel (PRACH), a specific sequence, or a specific time-frequency resource, which is not limited here.

[0345] Optionally, the information of the uplink measurement signal used to send to the second device and the third device can be sent to the terminal through an SSB or SIB1 message, and can also be sent to the terminal device through an RRC message. For example, the access network device determines the uplink measurement signal that can be used by each user and sends it to the terminal through an RRC message, such as an RRC release message, an RRC reconfiguration message, and an RRC establishment message. It can also be sent to the terminal through a non-access stratum (NAS) message, for example, a core network device (such as an AMF) determines the uplink measurement signal that can be used by each user, or the access network device determines the uplink measurement signal that can be used by each user and informs the core network device, and sends it to the terminal through a NAS message, such as a registration accept message and a tracking area update (TAU) accept message.

[0346] Optionally, the SSB or SIB1 message also includes information about the uplink measurement signal sending period; after the terminal receives the SSB or SIB1 message, the terminal can send measurement information to the second device and the third device according to the sending period. For example, for different terminal moving speeds, it is expected that the terminal sends different periods of uplink measurement signals. If the moving speed is fast, the reporting period is short, and if the moving speed is slow, the sending period is long. For example, the SSB or SIB1 message includes a mapping relationship between the moving speed and the period for sending uplink measurements. For example, when the terminal's moving speed is 30 km / h (kilometers per hour), the period for sending uplink measurements is once every 5 seconds, and when the terminal's moving speed is 100 km / h, the period for sending uplink measurements is once every 100 ms. For another example, for different battery levels of the terminal, the terminal is expected to send uplink measurement signals at different periods. The more remaining battery power, the shorter the reporting period, and the less remaining battery power, the longer the reporting period. For example, the SSB or SIB1 message includes a mapping relationship between the remaining battery power and the period for sending uplink measurement information. For example, when the remaining battery power is 10%, the period for sending uplink measurement information is once every 5 seconds, and when the remaining battery power is 80%, the period for sending uplink measurement information is once every 100 ms. It is understandable that the information on the uplink measurement signal sending period can also be included in other system messages, such as SIB2, SIB3, etc., without limitation here. It is understandable that the information on the uplink measurement signal sending period can also be sent by the network to the terminal through a specific message, such as an RRC message, such as an RRC release message, an RRC reconfiguration message, or an RRC establishment message; it can also be sent by the network to the terminal through an NAS message, such as a registration accept message, a TAU accept message, etc.

[0347] Optionally, the SSB or SIB1 message also includes information about the first uplink measurement resource, and the first uplink measurement resource is used for terminals that are not allocated uplink measurement resources to send uplink measurement signals. After the second device or the third device receives the uplink measurement signal through the uplink measurement signal, although the second device or the third device is not clear about the identity of the terminal that is not allocated to the measurement resource, it can obtain the distribution of the terminal that is not allocated to the measurement resource in each cell (such as a cell heat map), which is beneficial for the second device or the third device to judge the load, so as to determine the current network status, for example, it can be used for energy saving. It is understandable that the heat map of the cell can also be obtained by using a terminal-specific uplink measurement signal.

[0348] In step 702, the terminal sends an uplink measurement signal to a third device.

[0349] In step 703, the terminal sends an uplink measurement signal to the second device.

[0350] The terminal sends an uplink measurement signal to the second device. The terminal may send the uplink measurement signal to the second device and the third device separately, or may send the uplink measurement signal to the second device and the third device simultaneously, that is, step 702 and step 703 are completed in one step.

[0351] In step 704, the third device sends the second measurement result to the fourth device.

[0352] After receiving the measurement information sent by the terminal, the third device can obtain a measurement result, which is related to the signal strength.

[0353] In step 705 , the second device sends the first measurement result to the fourth device.

[0354] In step 706, the terminal sends an RRC establishment request message to the fourth device through the first device.

[0355] In step 707, the fourth device sends an RRC establishment message to the terminal through the first device.

[0356] In step 708, the terminal sends an RRC establishment completion message to the fourth device through the first device.

[0357] In step 709, the fourth device sends an uplink transmission message to the core network device.

[0358] The fourth device sends an uplink transmission message to the core network device. The uplink transmission message includes the identifier of the terminal. The uplink transmission message can be an initial terminal message or other message, which is not limited here.

[0359] In step 710, the core network device sends a fourth message to the fourth device. The core network device finds the SRS information corresponding to the identifier of the terminal based on the identifier of the terminal in the uplink transmission message, and sends a fourth message to the fourth device. The fourth message includes the SRS information, that is, the SRS corresponding to the identifier of the terminal. The fourth device obtains the uplink measurement result of the terminal based on the SRS information, and determines the downlink resources and / or uplink resources to be used for the terminal based on the measurement result, that is, determines whether the cell of the second device or the cell of the third device serves the terminal. The fourth message can be a UE context establishment request message, or other messages, which are not limited here.

[0360] In step 711 , the fourth device determines cell 3 as the downlink Scell ​​of cell 2 and informs the second device.

[0361] Optionally, in addition to the measurement result influencing the selection of the second device or the third device, available resources are also a consideration in selecting the cell of the second device or the third device. Available resources include the available resources of the second device and the available resources of the third device. Available resources can be spectrum resources or CPU utilization, etc. These two factors jointly determine whether the second device or the third device is selected to provide DL services to the terminal, further ensuring the normal establishment of the first downlink communication connection.

[0362] In step 712, the fourth device sends RRC reconfiguration information to the terminal through the first device.

[0363] exist Figure 7 In the description, the fourth device determines whether the second device or the third device provides the DL service for the terminal. In actual applications, this function can also be determined by the first device, the second device, the third device, or the core network device. For example, in the embodiment of the present application, all or part of the functions that can be implemented by the fourth device are completed by the core network device.

[0364] about Figure 7 The description can refer to the above Figure 5a For example, step 701 can refer to step 501, and the RRC establishment request message in step 706 can refer to the RRC establishment request message in step 502. In particular, Figure 5a Any optional technical solution in Figure 7 The corresponding references can be made in .

[0365] The above describes the method for establishing a communication connection in the embodiments of the present application. It should be noted that the method does not necessarily require all steps. Those skilled in the art can partially modify the method for establishing a communication connection based on the several embodiments provided above, such as deleting some steps, combining several steps, etc. The following describes the apparatus for establishing a communication connection in the embodiments of the present application.

[0366] See also Figure 8 , Figure 8 A structural diagram of an apparatus for establishing a communication connection in an embodiment of the present application.

[0367] The apparatus includes: a first receiving module 801, configured to receive a first message sent by a first device, wherein the first message includes information about uplink resources of a second device;

[0368] The sending module 802 is configured to send a second message to the second device through the uplink resources of the second device.

[0369] The second receiving module 803 is used to receive a third message sent by the first device, where the third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0370] Optionally, each module in the device is also used to Figure 5a , Figure 5b , Figure 6a or Figure 6b Execute all or part of the operations that can be performed by the terminal in any figure according to the description in the figure.

[0371] See also Figure 9 , Figure 9 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application.

[0372] The apparatus includes: a first sending module 901, configured to send a first message to a terminal, where the first message includes information about uplink resources of a second device, where the uplink resources of the second device are used by the terminal to send a second message to the second device through the uplink resources of the second device;

[0373] The second sending module 902 is used to send a third message to the terminal, where the third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0374] Optionally, each module in the device is also used to Figure 5a , Figure 5b , Figure 6a or Figure 6b , performing all or part of the operations that can be performed by the first device in any figure.

[0375] See also Figure 10 , Figure 10 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application.

[0376] The apparatus includes: a receiving module 1001, configured to receive a second message sent by a terminal through an uplink resource of a second device, where the uplink resource of the second device is obtained by the terminal from a first message sent by a first device.

[0377] The sending module 1002 is used to send a confirmation message to the first device, and the confirmation message is used to allow the first device to send a third message to the terminal. The third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0378] Optionally, each module in the device is also used to Figure 5a , Figure 5b , Figure 6a or Figure 6b , performing all or part of the operations that can be performed by the second device in any figure.

[0379] See also Figure 11 , Figure 11 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application.

[0380] The device includes:

[0381] A first receiving module 1101 is configured to receive a first message from a first device;

[0382] A first sending module 1102 is configured to send an uplink measurement signal to the second device and the third device;

[0383] A second sending module 1103 is configured to send a second message to the first device;

[0384] The second receiving module 1104 is used to receive a third message sent by the first device, where the third message is obtained based on a measurement result, where the measurement result includes a first measurement result and a second measurement result, where the first measurement result is obtained by the uplink measurement signal received by the second device, and the second measurement result is obtained by the uplink measurement signal received by the third device. The third message includes information about downlink resources of the second device, where the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0385] Optionally, each module in the device is also used to Figure 7 Execute all or part of the operations that the terminal can perform according to the description in

[0386] See also Figure 12 , Figure 12 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application.

[0387] The apparatus includes: a first sending module 1201, configured for a terminal to send a first message, wherein the first message is configured for the terminal to send an uplink measurement signal to a second device and a third device according to the first message;

[0388] Receiving module 1202, configured to receive a second message sent by the terminal;

[0389] The second sending module 1203 is configured to send a third message to the terminal, where the third message is obtained based on a measurement result, the measurement result including a first measurement result and a second measurement result, the first measurement result being obtained by the uplink measurement signal received by the second device, and the second measurement result being obtained by the uplink measurement signal received by the third device. The third message includes information about downlink resources of the second device, where the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. Optionally, the first message also includes information about uplink resources for sending measurement information, where the information about the uplink resources of the measurement information includes information about the uplink resources of the second device, where the uplink resources of the measurement information are used by the terminal to send the uplink measurement signal to the second device and the third device via the uplink resources of the measurement information.

[0390] Optionally, each module in the device is also used to Figure 7 , performing all or part of the operations that the first device can perform.

[0391] See also Figure 13 , Figure 13 This is another structural diagram of the device for establishing a communication connection in an embodiment of the present application.

[0392] The device includes:

[0393] The receiving module 1301 is configured to receive an uplink measurement signal sent by a terminal, where the uplink measurement signal is obtained by the terminal according to a first message sent by a first device.

[0394] The sending module 1302 is used to send a confirmation message to the first device, where the confirmation message is used to enable the first device to send a third message to the terminal after receiving the second message. The third message is obtained based on the measurement results, where the measurement results include a first measurement result and a second measurement result. The first measurement result is obtained by the uplink measurement signal received by the second device, and the second measurement result is obtained by the uplink measurement signal received by the third device. The third message includes information about the downlink resources of the second device, and the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

[0395] Optionally, each module in the device is also used to Figure 7 , performing all or part of the operations that the second device can perform.

[0396] See also Figure 14 , Figure 14 This is a structural diagram of a terminal in an embodiment of the present application.

[0397] When the terminal is a mobile phone, refer to Figure 14 The mobile phone includes: a radio frequency (RF) circuit 1410 and a processor 1480 .

[0398] Processor 1480 is the control center of the mobile phone. It uses various interfaces and lines to connect various parts of the entire mobile phone. By running or executing software programs and / or modules stored in memory 1420 and calling data stored in memory 1420, it executes various functions of the mobile phone and processes data, thereby monitoring the mobile phone as a whole.

[0399] RF circuitry 1410 can be used to receive and transmit signals during information transmission or calls. Specifically, it receives downlink information from access network devices and transmits it to processor 1480 for processing. It also transmits uplink data to the access network device. Typically, RF circuitry 1410 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, and more. RF circuitry 1410 can also communicate with the network and other devices via wireless communications.

[0400] For example, in an embodiment of the present application, the RF circuit 1410 is used to receive a first message sent by a first device, the first message including information about the uplink resources of the second device; the RF circuit 1410 is also used to send a second message to the second device through the uplink resources of the second device; the RF circuit 1410 is also used to receive a third message sent by the first device, the third message including information about the downlink resources of the second device, the downlink resources of the second device being used by the terminal to establish a first downlink communication connection with the second device according to the downlink resources of the second device. Optionally, the RF circuit 1410 is also used to Figure 1 , Figure 3 , Figure 5a , Figure 5b or Figure 7 Execute all or part of the operations that can be performed by the terminal in any figure according to the description in the figure.

[0401] Or, in an embodiment of the present application, the RF circuit 1410 is used to receive a first message from the first device; the RF circuit 1410 is used to send an uplink measurement signal to the second device and the third device; the RF circuit 1410 is used to send a second message to the first device; the RF circuit 1410 is used to receive a third message sent by the first device, the third message is obtained based on the measurement result, the measurement result includes the first measurement result and the second measurement result, the first measurement result is obtained by the uplink measurement signal received by the second device, the second measurement result is obtained by the uplink measurement signal received by the third device, the third message includes information about the downlink resources of the second device, the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. Optionally, the RF circuit 1410 is also used in accordance with Figure 1 , Figure 3 , Figure 6a , Figure 6b or Figure 7 Execute all or part of the operations that can be performed by the terminal in any figure according to the description in the figure.

[0402] Optionally, the mobile phone may further include components such as a memory 1420, an input unit 1430, a display unit 1440, a sensor 1450, an audio circuit 1460, a wireless fidelity module 1470, a processor 1480, and a power supply 1490. Those skilled in the art will appreciate that Figure 14 The mobile phone structure shown in the figure does not constitute a limitation to the mobile phone, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0403] The input unit 1430 can be used to receive input digital or character information, and generate key signal input related to the user settings and function control of the mobile phone. The memory 1420 can be used to store software programs and modules, and the processor 1480 executes various functional applications and data processing of the mobile phone by running the software programs and modules stored in the memory 1420. The display unit 1440 can be used to display information input by the user or information provided to the user and various menus of the mobile phone. The display unit 1440 may include a display panel 1441. Optionally, the display panel 1441 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

[0404] The mobile phone may also include at least one sensor 1450, such as a light sensor, motion sensor, or other sensor. An audio circuit 1460, a speaker 1461, and a microphone 1462 provide an audio interface between the user and the mobile phone. The audio circuit 1460 can convert received audio data into electrical signals and transmit them to the speaker 1461, which then converts the signals into sound signals for output. Meanwhile, the microphone 1462 converts the collected sound signals into electrical signals, which are then received by the audio circuit 1460 and converted into audio data. The audio data is then output to the processor 1480 for processing, and then transmitted to, for example, another mobile phone via the RF circuit 1410, or the audio data is output to the memory 1420 for further processing.

[0405] The mobile phone also includes a power supply 1490 (such as a battery) for supplying power to various components. Preferably, the power supply can be logically connected to the processor 1480 through a power management system, thereby realizing functions such as charging, discharging, and power consumption management through the power management system.

[0406] The above describes the terminal in the embodiment of the present application. The following describes the access network device in the embodiment of the present application.

[0407] See also Figure 15 , Figure 15 This is a structural diagram of the access network device in an embodiment of the present application.

[0408] like Figure 15 As shown, the access network device 1500 includes a transceiver 1520 and a processor 1510. The access network device may be Figure 1 , Figure 5a , Figure 5b , Figure 6a , Figure 6b or Figure 7 The first device in.

[0409] Among them, the transceiver 1520 is used to send a first message to the terminal, the first message includes information about the uplink resources of the second device, the uplink resources of the second device are used by the terminal to send a second message to the second device through the uplink resource device of the second device, and the second message is used to obtain a third message; send a third message to the terminal, the third message includes information about the downlink resources of the second device, and the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. Optionally, the transceiver 1520 is also used to perform all operations that can be performed by the first device, such as the first device in the communication Figure 5a , Figure 5b , Figure 6a or Figure 6b The operations performed in the corresponding embodiments.

[0410] Or the transceiver 1520 is used to receive the second message sent by the terminal through the uplink resources of the second device, the uplink resources of the second device are obtained by the terminal from the first message sent by the first device; send a confirmation message to the first device, the confirmation message is used to let the first device send a third message to the terminal, the third message includes information about the downlink resources of the second device, the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device. Optionally, the transceiver 1520 is also used to perform all operations that can be performed by the second device, such as the second device in the communication Figure 5a , Figure 5b , Figure 6a or Figure 6b The operations performed in the corresponding embodiments.

[0411] Or the transceiver 1520 is used for the first device to send a first message to the terminal, the first message is used for the terminal to send an uplink measurement signal to the second device and the third device according to the first message; receive a second message sent by the terminal; send a third message to the terminal, the third message is obtained based on the measurement result, the measurement result includes the first measurement result and the second measurement result, the first measurement result is obtained by the uplink measurement signal received by the second device, the second measurement result is obtained by the uplink measurement signal received by the third device, the third message includes information about the downlink resources of the second device, the downlink resources of the second device are used for the terminal to establish a first downlink communication connection with the second device according to the downlink resources of the second device. Optionally, the transceiver 1520 is also used to perform all operations that can be performed by the second device, such as the second device in the communication with Figure 7 The operations performed in the corresponding embodiments.

[0412] Or the transceiver 1520 is used to receive an uplink measurement signal sent by the terminal, the uplink measurement signal is obtained by the terminal according to the first message sent by the first device; send a confirmation message to the first device, the confirmation message is used to let the first device send a third message to the terminal after receiving the second message, the third message is obtained according to the measurement result, the measurement result includes the first measurement result and the second measurement result, the first measurement result is obtained by the uplink measurement signal received by the second device, the second measurement result is obtained by the uplink measurement signal received by the third device, the third message includes information about the downlink resources of the second device, the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device according to the downlink resources of the second device. Optionally, the transceiver 1520 is also used to perform all operations that can be performed by the second device, such as the second device in the communication with Figure 7 The operations performed in the corresponding embodiments.

[0413] Processor 1510 may be an application-specific integrated circuit (ASIC), a digital signal processor (DSP), or other chips with specific processing functions, such as a baseband chip, or any combination thereof. Processor 1510 may be a single processor or may include multiple processors.

[0414] Access network device 1500 may also include a memory, which may be located inside or outside processor 1510. The memory stores the following elements: executable modules or data structures, or subsets or extensions thereof: Operation instructions: including various operation instructions for implementing various operations. Operating system: including various system programs for implementing various basic services and processing hardware-based tasks.

[0415] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0416] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0417] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0418] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.

Claims

1. A method for establishing a communication connection, characterized in that: include: The terminal receives a first message sent by the first device, where the first message includes information about uplink resources of the second device; The terminal sends a second message to the second device through the uplink resource of the second device; The terminal receives a third message sent by the first device, where the third message includes information about downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device according to the downlink resources of the second device.

2. The method according to claim 1, characterized in that The first message also includes information about a reference signal received power (RSRP) threshold and uplink resources of the first device, where the uplink resources of the first device are used by the terminal to establish a second uplink communication connection with the first device according to the uplink resources of the first device, and the uplink resources of the second device are used by the terminal to establish a first uplink communication connection with the second device according to the uplink resources of the second device; The method further comprises: If the RSRP between the terminal and the first device is greater than the RSRP threshold, the terminal sends data, signaling or random access signal to the second device through the first uplink communication connection; or, If the RSRP between the terminal and the first device is less than the RSRP threshold, the terminal sends data, signaling or random access signal to the first device through the second uplink communication connection; or If the RSRP of the terminal and the first device is equal to the RSRP threshold, the terminal sends data through the first uplink communication connection or the second uplink communication connection.

3. The method according to claim 1 or 2, characterized in that The first message also includes a first physical cell identity PCI and a second PCI; The method further comprises: The terminal receives a first primary synchronization signal PSS and a supplementary synchronization signal SSS sent by the second device, where the first PSS and SSS correspond to the first PCI; The terminal receives a second PSS and SSS sent by a third device, where the second PSS and SSS correspond to the second PCI; The terminal sending the second message to the second device through the uplink resource of the second device includes: If the first PCI strength is greater than the second PCI strength, the terminal sends the second message to the second device through the uplink resources of the second device, the first PCI strength is the signal strength of the first PSS and SSS, and the second PCI strength is the signal strength of the second PSS and SSS.

4. The method according to any one of claims 1 to 3, characterized in that The third message or the first message further includes system frame number SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

5. A method for establishing a communication connection, characterized in that: include: A first device sends a first message to a terminal, where the first message includes information about uplink resources of a second device, where the uplink resources of the second device are used by the terminal to send a second message to the second device through an uplink resource device of the second device, where the second message is used to obtain a third message; The first device sends a third message to the terminal, where the third message includes information about downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device according to the downlink resources of the second device.

6. The method according to claim 5, characterized in that The first message also includes information about a reference signal received power RSRP threshold and uplink resources of the first device. The uplink resources of the second device are used by the terminal to establish a first uplink communication connection with the second device according to the uplink resources of the second device. The uplink resources of the first device are used by the terminal to establish a second uplink communication connection with the first device according to the uplink resources of the first device. The RSRP threshold is used for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the first device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the first device through the second uplink communication connection if the RSRP between the terminal and the first device is equal to the RSRP threshold.

7. The method according to claim 5 or 6, characterized in that The first message also includes a first physical cell identity PCI and a second PCI; The method further comprises: The first device sends a first primary synchronization signal PSS and a supplementary synchronization signal SSS to the terminal, the first PSS and SSS are used by the terminal to obtain a first PCI strength, the first PSS and SSS correspond to the first PCI, the first PCI strength is used for if the first PCI strength is greater than the second PCI strength, then the terminal sends the second message to the second device through the uplink resource, the second PCI strength is obtained by the terminal according to the second PSS and SSS sent by the second device, the second PSS and SSS correspond to the second PCI.

8. The method according to any one of claims 5 to 7, characterized in that The third message or the first message further includes system frame number SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

9. A method for establishing a communication connection, characterized in that: include: The second device receives a second message sent by the terminal through an uplink resource of the second device, where the uplink resource of the second device is obtained by the terminal from the first message sent by the first device; The second device sends a confirmation message to the first device, and the confirmation message is used to allow the first device to send a third message to the terminal. The third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

10. The method according to claim 9, characterized in that The first message also includes information about a reference signal received power RSRP threshold and uplink resources of the first device. The uplink resources of the second device are used by the terminal to establish a first uplink communication connection with the second device according to the uplink resources of the second device. The uplink resources of the first device are used by the terminal to establish a second uplink communication connection with the first device according to the uplink resources of the first device. The RSRP threshold is used for the terminal to send data, signaling or random access signal to the second device through the first uplink communication connection if the RSRP between the terminal and the first device is greater than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the first device through the second uplink communication connection if the RSRP between the terminal and the first device is less than the RSRP threshold, or for the terminal to send data, signaling or random access signal to the first device through the second uplink communication connection if the RSRP between the terminal and the first device is equal to the RSRP threshold.

11. The method according to claim 9 or 10, characterized in that The first message also includes a first physical cell identity PCI and a second PCI; The method further comprises: The second device sends a second primary synchronization signal PSS and a supplementary synchronization signal SSS to the terminal, the second PSS and SSS are used by the terminal to obtain a second PCI strength, the second PSS and SSS correspond to the second PCI, the second PCI strength is used for if the first PCI strength is greater than the second PCI strength, then the terminal sends the second message to the second device through the uplink resource, the first PCI strength is obtained by the terminal based on the first PSS and SSS sent by the first device, the first PSS and SSS correspond to the first PCI.

12. The method according to any one of claims 9 to 11, characterized in that The third message or the first message further includes system frame number SFN information, and the SFN information is used by the terminal to perform downlink frame synchronization with the second device according to the SFN information.

13. A device for establishing a communication connection, characterized in that include: A first receiving module, configured to receive a first message sent by a first device, where the first message includes information about uplink resources of a second device; a sending module, configured to send a second message to the second device through the uplink resource of the second device; The second receiving module is used to receive a third message sent by the first device, where the third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

14. A device for establishing a communication connection, characterized in that: include: A first sending module, configured to send a first message to a terminal, where the first message includes information about uplink resources of a second device, and the uplink resources of the second device are used by the terminal to send a second message to the second device through the uplink resources of the second device; The second sending module is used to send a third message to the terminal, where the third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device according to the downlink resources of the second device.

15. A device for establishing a communication connection, characterized in that: include: a receiving module, configured to receive a second message sent by a terminal through an uplink resource of a second device, where the uplink resource of the second device is obtained by the terminal from the first message sent by the first device; A sending module is used to send a confirmation message to the first device, and the confirmation message is used to allow the first device to send a third message to the terminal. The third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

16. A terminal, characterized in that: include: a transceiver and a processor, wherein the transceiver is configured to receive a first message sent by a first device, wherein the first message includes information about uplink resources of a second device; A second message is sent to the second device through the uplink resources of the second device; a third message sent by the first device is received, and the third message includes information about the downlink resources of the second device, and the downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

17. An access network device, characterized in that: include: A transceiver and a processor, the transceiver being used to send a first message to a terminal, the first message including information about uplink resources of a second device, the uplink resources of the second device being used by the terminal to send a second message to the second device via the uplink resource device of the second device, the second message being used to obtain a third message; and to send a third message to the terminal, the third message including information about downlink resources of the second device, the downlink resources of the second device being used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

18. An access network device, characterized in that: include: a transceiver and a processor, the transceiver being configured to receive a second message sent by a terminal through an uplink resource of a second device, where the uplink resource of the second device is obtained by the terminal from the first message sent by the first device; The second device sends a confirmation message to the first device, and the confirmation message is used to allow the first device to send a third message to the terminal. The third message includes information about the downlink resources of the second device. The downlink resources of the second device are used by the terminal to establish a first downlink communication connection with the second device based on the downlink resources of the second device.

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