Connection establishment method, device, equipment and storage medium

Abstract

The present application discloses a connection establishment method, an apparatus, a device and a storage medium, which includes the steps of: a terminal equipment (UE) located in or connected to a single frequency network cell group (SFN) receiving access related information sent from a network side device; and establishing a connection with a target cell based on the access related information, wherein the target cell is a cell or transmission / reception point specific to a Cell / TRP.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to China Patent Application No. 202011053589.3, filed in China on September 29, 2020, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of communication technology, and specifically to a connection establishment method, device, apparatus, and storage medium. [Background technology]

[0003] As future communication systems are deployed in higher frequency bands, the coverage area of ​​a cell or transmission reception point (TRP) will become smaller and smaller, and the application scenarios supported by the mobile communication system will become richer and richer, including more high-speed scenarios. Therefore, the terminal equipment UE needs to perform cell handover or cell reselection frequently, which increases the terminal measurement, bringing great challenges to the power consumption of the terminal equipment UE.

[0004] In order to reduce the power consumption of the terminal equipment UE, cell free or single frequency network (SFN) becomes an important deployment scenario in dense network or high speed scenario. However, in the prior art, the terminal equipment UE still resides in the cell layer / TRP layer when establishing a connection, and also resides in the cell layer / TRP layer when initiating random access (RACH) or connection establishment, which results in excessive power consumption of the terminal equipment UE.

[0005] Therefore, how to propose a connection establishment method that realizes power saving of terminal equipment (UE) is an issue that needs to be resolved as soon as possible. Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a connection establishment method, device, equipment, and storage medium that enable a terminal device UE to establish a connection with low power consumption. [Means for solving the problem]

[0007] In order to solve the above technical problems, the present application is realized as follows.

[0008] In a first aspect, an embodiment of the present application provides a connection establishment method, the connection establishment method including the steps of: a terminal equipment UE, which is located in or connected to a single frequency network cell group SFN, receiving access related information transmitted from a network side equipment; and establishing a connection with a target cell based on the access related information, wherein the target cell is a cell or a transmission / reception point specific to a Cell / TRP.

[0009] In a second aspect, an embodiment of the present application provides a connection establishment method, comprising the step of transmitting access related information to a terminal equipment UE serving or connected to a single frequency network cell group SFN, the access related information being for instructing the terminal equipment UE to establish a connection with a target cell, the target cell being a cell or a transmission / reception point specific to a Cell / TRP.

[0010] In a third aspect, an embodiment of the present application provides a connection establishment device, in which a terminal equipment UE located in or connected to a single frequency network cell group SFN comprises: a first receiving module for receiving access related information transmitted from a network side equipment; and a connection module for establishing a connection with a target cell based on the access related information, wherein the target cell is a cell or a transmission / reception point specific to a Cell / TRP.

[0011] In a fourth aspect, an embodiment of the present application provides a connection establishment device, comprising a first transmitting module for transmitting access related information to a terminal equipment UE serving or connected to a single frequency network cell group SFN, the access related information being for instructing the terminal equipment UE to establish a connection with a target cell, the target cell being a cell or a transmission / reception point specific to a Cell / TRP.

[0012] In a fifth aspect, an embodiment of the present application provides a terminal device UE comprising a processor, a memory, and a program or command stored in the memory and executable by the processor, the program or command realizing steps of the connection establishment method described in the first aspect when executed by the processor.

[0013] In a sixth aspect, an embodiment of the present application provides a network side device comprising a processor, a memory, and a program or command stored in the memory and executable by the processor, the program or command realizing steps of the connection establishment method described in the second aspect when executed by the processor.

[0014] In a seventh aspect, an embodiment of the present application provides a readable storage medium having stored thereon a program or command, which, when executed by a processor, causes the steps of the connection establishment method described in the first or second aspect to be realized.

[0015] In an eighth aspect, an embodiment of the present application provides a program product stored on a non-volatile readable storage medium, which, when executed by a processor, realises the steps of the connection establishment method described in the first or second aspect. Effect of the Invention

[0016] In the embodiment of the present application, when a terminal equipment UE that is present or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the terminal equipment UE directly obtains access related information for establishing a connection with the target cell from a network side device, and then establishes a connection with the target cell.Compared with the terminal equipment UE presenting in a Cell / TRP to initiate random access or establish a connection in the prior art, the terminal equipment UE avoids performing cell measurement and cell switching frequently, effectively saving the power consumption of the terminal equipment UE and saving network overhead. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a schematic diagram of a single frequency network cell group SFN provided in an embodiment of the present application; [Diagram 2] FIG. 2 is a schematic diagram of a random access process provided in the examples of the present application. [Diagram 3] FIG. 2 is a schematic diagram of the procedure of a connection establishment method provided in an embodiment of the present application. [Figure 4] FIG. 2 is a schematic diagram of application scenarios of the high and low frequency ranges provided in the examples of the present application. [Diagram 5] FIG. 2 is a schematic diagram of another connection establishment method provided in an embodiment of the present application. [Figure 6] FIG. 11 is a schematic diagram of yet another connection establishment method provided in an embodiment of the present application. [Figure 7] FIG. 11 is a schematic diagram of yet another connection establishment method provided in an embodiment of the present application. [Figure 8] FIG. 11 is a schematic diagram of yet another connection establishment method provided in an embodiment of the present application. [Figure 9] FIG. 11 is a schematic diagram of yet another connection establishment method provided in an embodiment of the present application. [Figure 10] FIG. 2 is a structural schematic diagram of a connection establishment device provided in an embodiment of the present application; [Figure 11] FIG. 2 is a structural schematic diagram of another connection establishment device provided in an embodiment of the present application; [Figure 12]FIG. 2 is a hardware structure schematic diagram of a terminal device UE for implementing an embodiment of the present application; [Figure 13] FIG. 2 is a schematic diagram of the hardware structure of a network side device for implementing an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Of course, the described embodiments are only a part of the embodiments of the present invention, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative effort are within the scope of protection of the present invention.

[0019] The terms "first," "second," and the like in the specification and claims of this application do not describe a particular order or sequence, but are intended to distinguish between similar objects. It should be understood that the terms so used may be substituted for one another where appropriate, such that the embodiments of this application may be practiced in other orders than those illustrated or described herein. Also, the term "and / or" in the specification and claims represents at least one of the connected objects, and the " / " symbol generally represents an "or" relationship between the related objects before and after.

[0020] It should be noted that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, and can also be applied to other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application may often be used interchangeably. The described technology may be used in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. However, in the following description, a New Radio (NR) system will be described for illustrative purposes, and NR terminology will be used in much of the following description, but these techniques are applicable to systems other than NR systems, for example, 6th generation (6G) systems. th It is also applicable to 6G (Generation, 6G) communication systems.

[0021] In the embodiment of the present application, the terminal equipment UE may be called a terminal or a terminal device or a user terminal (User Equipment, UE), and the terminal equipment UE may be a terminal side device such as a mobile phone, a tablet personal computer, a laptop computer also called a notebook computer, a personal digital assistant (PDA), a personal digital assistant, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), a wearable device, a vehicle-mounted device (VUE), a pedestrian terminal (PUE), etc., and the wearable device includes a bracelet, an earphone, glasses, etc. It should be noted that the embodiment of the present application does not limit the specific type of the terminal. The network side equipment may be a base station, and the base station may be called a Node B, an evolved Node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting and receiving point (TRP), or any other suitable term in the art, and the base station is not limited to a specific technical term as long as it can achieve the same technical effect. It should be noted that the embodiment of the present application merely takes a base station in an NR system as an example, but does not limit the specific type of the base station.

[0022] In order to better understand the solution provided in this application, the following will first be described.

[0023] 1. Introduction to Single-Frequency Network (SFN) The single frequency network (SFN) transmission method means that multiple cells or multiple transmission points transmit the same signal, and there is no same-frequency interference between different cells. The multiple signals can improve the signal to interference plus noise ratio (SINR), transmission quality and coverage effect.

[0024] FIG. 1 is a schematic diagram of a single frequency network cell group SFN provided in an embodiment of the present application, and FIG. 1 shows a single frequency network cell group SFN super cell consisting of seven cells.

[0025] It can be understood that multiple cells constituting a single frequency network cell group SFN can share one cell ID, i.e., the ID of a super cell. Multiple cells can transmit signals in the manner of SFN transmission, for example, each cell in the SFN transmits with a wide beam, and at a certain time, a terminal equipment UE can receive the wide beams transmitted from multiple cells, thereby obtaining diversity gain. In the SFN transmission mode, the terminal equipment UE does not need to frequently perform operations related to cell reselection or handover between cells.

[0026] 2. Mobility of terminal equipment UE in idle / inactive state For a terminal equipment UE in idle or inactive state, during movement, the network provides a priority for each frequency point.

[0027] For adjacent cells of the same frequency, an offset amount is added based on the measurement results of the target cell or the adjacent cell to obtain a measurement evaluation value of the target cell or the adjacent cell, and an offset amount is added based on the measurement results of the serving cell to obtain a measurement evaluation value of the serving cell.

[0028] If it is determined that the measurement evaluation value of the target cell or the neighboring cell is better than the measurement evaluation value of the serving cell, and the duration exceeds a first predetermined time length, for example a time length configured by the network, and the terminal equipment UE's stay time in the current serving cell exceeds a second predetermined time length, for example a second predetermined time length of 1 s specified in the protocol, the terminal equipment UE reselects the target cell or the neighboring cell.

[0029] For a high priority inter-frequency or inter-RAT neighbouring cell, if the measurement evaluation value of the target cell or neighbouring cell exceeds a first predetermined threshold and the duration exceeds a third predetermined time period, for example a time period configured by the network, the terminal device UE reselects the target cell or neighbouring cell.

[0030] For low-priority inter-frequency or inter-RAT neighboring cells, if the measurement evaluation value of the target cell or neighboring cell is greater than a second predetermined threshold and the measurement evaluation value of the current serving cell is less than the second threshold and the duration exceeds a fourth predetermined time length, for example a time length configured by the network, the terminal equipment UE reselects the target cell or neighboring cell.

[0031] For inter-frequency or inter-RAT neighboring cells, if the frequency point priority of the target cell or neighboring cell is the same as the frequency point priority of the current serving cell or serving cell, the cell reselection method is the same as the cell reselection method of the same frequency cell.

[0032] A terminal device UE in an idle state (Idle) or an inactive state can trigger a connection establishment process by receiving a paging message transmitted from a network side device, and can transmit and receive data.

[0033] 3. Introduction to the separation of Centralized Unit (CU) and Distributed Unit (DU) In the 5G system, the base station gNB can place its protocol stack entities in different control units. For example, Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) are placed in the CU, and Radio Link Control (RLC) and Media Access Control (MAC) / Port Physical Layer (PHY) are placed in the DU. The CU and DU have certain radio resource management authority. For example, the CU can manage the cells connected under it through RRC messages, and the DU can manage the cells connected under it through MAC CE messages. Multiple DUs are connected to one CU, but the CU is connected to the core network and other CUs.

[0034] 4. Basic flow of terminal system access (1) Initial network discovery The initial network discovery includes synchronization of Synchronization Signal Blocks (SSB) and receiving system information, specifically, receiving Primary Synchronization Signals (PSS), then Secondary Synchronization Signals (SSS), and then receiving the Physical Broadcast Channel (PBCH), and obtaining the SSB index, and the information in the PBCH RMRS and Master Information Block (MIB).

[0035] (2) Based on the above acquired information, broadcast system information (SI) is received, which further includes information necessary for accessing the system.

[0036] (3) Random access is performed based on the information necessary to access the system obtained above.

[0037] 5. Random Access (RACH) Process Currently, the RACH process is divided into contention random access and contention-free random access processes.

[0038] FIG. 2 is a schematic diagram of a random access process provided in an embodiment of the present application. As shown in FIG. 2, the contention random access process includes a four-step access from Message 1 to Message 4, and the contention-free random access process includes a two-step access from Message 1 to Message 2.

[0039] Both Message 2 for contention random access and contention-free random access are used to transmit a Random Access Response (RAR). The UE listens for the RAR corresponding to the random access Radio Network Temporary Identity (RA-RNTI) within the RAR window.

[0040] In the contention random access, there is a problem that the terminal equipment UE transmits the same preamble in the same PRACH (Physical Random Access Channel) resource, so after receiving Message 2, it can further transmit Message 3 based on the UL grant in Message 2, and the terminal equipment UE can carry a UE identifier in Message 3, and when Message 3 is transmitted, it can simultaneously start a contention resolution timer. If the UE receives Message 4 transmitted from the base station before the contention resolution timer times out, the UE succeeds in contention resolution. The base station may carry a UE identifier in Message 4. After receiving Message 4, the terminal equipment UE can determine whether Message 4 is its own based on the UE identifier carried in Message 4 and determine whether the contention is successful.

[0041] Furthermore, in order to reduce the access delay to the system, a 2-step RACH can be introduced, i.e., a RACH process including a step in which the terminal device UE transmits Message A to the network side device and a step in which the terminal device receives Message B delivered from the network side device. Message A includes the functions of the above Message 1 or Message 1 and Message 3, and Message B includes the functions of the above Message 2 or Message 2 and Message 4.

[0042] 6. Receiving paging messages In an LTE (Long Term Evolution) or NR (New Radio) system, a DRX (Discontinuous Reception) period can be introduced to save power consumption of a UE. The terminal equipment UE can monitor a PDCCH (Physical Downlink Control Channel) at a position corresponding to a PF (Paging Frame) and a PO (Paging occasion) calculated based on a terminal identifier and multiple configurations of network side equipment, and can receive a paging message on a resource indicated by the PDCCH. The terminal identifier may be an IMSI (International Mobile Subscriber Identity) in LTE, and may be a 5G-S-TMSI in NR.

[0043] When the terminal equipment UE is in an idle state, the network does not know the specific location of the UE, so when the core network needs to page the terminal equipment UE, it can send a paging message to the UE via all base stations within a certain range, for example, all base stations within a certain area below a tracking area.

[0044] The connection establishment method provided in the embodiments of the present application will be described in detail below through specific embodiments and its application scenarios with reference to the drawings.

[0045] FIG. 3 is a procedure diagram of a connection establishment method provided in an embodiment of the present application. As shown in FIG. 3, the method includes step 300, in which a terminal equipment UE, which is located in or connected to a single frequency network cell group SFN, receives access related information sent from a network side equipment, and step 310, in which the terminal equipment UE establishes a connection with a target cell based on the access related information, and the target cell is a cell or a transmission / reception point specific to a Cell / TRP.

[0046] Specifically, in actual deployment, SFN is the scope of a super cell and includes multiple cells or TRPs, and the SFN super cell is usually called an SFN layer. A cell corresponding to the super cell or SFN layer is a cell specific to the SFN, and multiple cells or TRPs included in the SFN scope are a cell / TRP layer. A cell / TRP corresponding to this layer is a cell or TRP specific to the cell / TRP. When a terminal device UE is present in or accesses an SFN or SFN layer, that is, when the terminal device UE is present in or accesses a cell / TRP or a cell / TRP layer, that is, when the terminal device UE is present in or accesses a cell specific to the cell / TRP. The terminal equipment UE initiates connection establishment or RACH to the SFN or SFN layer, i.e., the terminal equipment initiates connection establishment or RACH to a cell specific to the SFN, and the terminal equipment UE initiates connection establishment or RACH to the cell / TRP layer or cell / TRP, i.e., the terminal equipment initiates connection establishment or RACH to a cell specific to the cell / TRP. Correspondingly, the reference signal (RS), system message (SI), paging message (paging), etc. in the SFN layer are all called SFN-specific RS, SI, paging, etc. The RS, SI, paging, etc. in the cell / TRP layer are all called cell / TRP-specific RS, SI, paging, etc.

[0047] First, some of the above terms will be interpreted.

[0048] cell / TRP specific The relative sequences corresponding to each cell / TRP are independent. The sequences within a cell / TRP are the same.

[0049] SFN / super cell specific The associated allocation corresponding to each SFN or super cell is independent. The allocation within the SFN range or within the super cell range is the same.

[0050] It should be noted that the reference signal may be an SSB, i.e., an SFN specific SSB and a cell / TRP specific SSB, and the reference signal may be various reference signals such as a Channel-State Information reference signal (CSI-RS), a Cell Reference Signal (CRS), a Sounding Reference Signal (SRS), a Demodulation Reference Signal (DMRS), etc.

[0051] Specifically, in the prior art, the terminal equipment UE resides in the cell / TRP layer when initiating random access or connection establishment, and also resides in the cell / TRP layer when performing RACH or connection establishment, so the purpose of saving power of the terminal equipment UE cannot be achieved by effectively utilizing the residency or connection establishment in the SFN layer, and as a result, the power consumption of the terminal equipment UE becomes very high.

[0052] Therefore, in this embodiment, when the terminal equipment UE is in an idle state (Idle) or an inactive state, it may be configured to access the target cell when it is present in a single frequency network cell group and the terminal equipment UE is preparing to enter a connected state, or when it has already accessed the SFN layer, or in the process of establishing a connection with the SFN layer.

[0053] Specifically, when the terminal equipment UE is preparing to enter a connected state, or when it has already accessed the SFN layer, or in the process of establishing a connection with the SFN layer, it can directly obtain access-related information for establishing a connection with the target cell from the network side equipment. In this embodiment, the access-related information may be any information or combination thereof that can provide the terminal equipment UE with access resources, such as the physical layer cell identifier PCI of the target cell, the synchronization raster of the target cell, the reference signal of the target cell, and the random access RACH resource associated with the reference signal of the target cell, and the random access RACH resource associated with the reference signal of the target cell is, for example, a preamble configuration, a random access occasion (RO) resource, and other time domain, frequency domain, or code domain resources of RACH.

[0054] After obtaining the access related information, the terminal equipment UE can establish a connection with the target cell based on the access related information.

[0055] In this embodiment, the target cell may be a cell or a transmission / reception point TRP within the SFN range, or may be a cell or a transmission / reception point TRP outside the SFN range, and this embodiment is not limited thereto.

[0056] In the embodiment of the present application, when a terminal equipment UE that is present or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the terminal equipment UE directly obtains access related information for establishing a connection with the target cell from a network side device, and then establishes a connection with the target cell.Compared with the terminal equipment UE presenting in a Cell / TRP to initiate random access or establish a connection in the prior art, the terminal equipment UE avoids performing cell measurement and cell switching frequently, effectively saving the power consumption of the terminal equipment UE and saving network overhead.

[0057] Optionally, based on any of the above embodiments, before or when a terminal device UE located in the SFN establishes a connection with the target cell, the access related information includes at least one of: a physical layer cell identifier PCI of the target cell, a synchronization raster Sync raster of the target cell, a reference signal of the target cell, and a random access RACH resource associated with the reference signal of the target cell.

[0058] Specifically, when a terminal equipment UE located in an SFN layer is attempting to access the SFN layer but is not accessing it, i.e., when the terminal equipment UE located in the SFN establishes a connection with the target cell, it can directly establish a connection with the target cell, or it can receive access-related information sent from a network side device and establish a connection with the target cell based on the access-related information.

[0059] Specifically, a terminal device UE present in the SFN layer can receive access related information transmitted from a network side device before establishing a connection with a target cell, and establish a connection with the target cell based on the access related information, and the access related information may include at least one of a physical layer cell identifier PCI of the target cell which is a Cell / TRP specific PCI, a synchronization raster of the target cell which is a Cell / TRP specific Sync raster, a reference signal of the target cell which may be Cell / TRP specific SSB related information such as SSB number, SMTC, etc., and a random access RACH resource related to the reference signal of the target cell, such as a preamble arrangement, a random access occasion (RO) resource, and other time domain, frequency domain, or code domain resources of the RACH.

[0060] In this embodiment, the terminal equipment UE needs to perform a cell selection or reselection operation before initiating random access, and the terminal equipment UE initiates RACH random access or connection establishment on the selected / reselected target cell / TRP.

[0061] Optionally, based on any of the above embodiments, the access related information is indicated by at least one of a system information SI indication specific to the SFN, a system information SI indication of a target cell, and a reference signal indication of a target cell.

[0062] Specifically, when the terminal equipment UE acquires access-related information, it can first acquire at least one of system information SI specific to the SFN, system information SI of the target cell, and a reference signal of the target cell, and then acquire the access-related information according to the at least one instruction.

[0063] For example, the terminal equipment UE can first obtain reference information of the target cell, obtain the PCI of the target cell based on the reference signal of the target cell, further obtain the system information SI of the target cell based on the PCI of the target cell, and finally obtain a random access RACH resource associated with the reference signal of the target cell, and establish a connection with the target cell based on the RACH resource.

[0064] For example, the terminal equipment UE may first obtain the cell / TRP specific SI of the target cell, and then obtain the RACH resource associated with the cell / TRP specific SSB of the target cell.

[0065] Specifically, in this embodiment, the system information SI of SFN can indicate one, two, or all of three kinds of access related information, namely, the physical layer cell identifier PCI of the target cell, which is Cell / TRP specific PCI, the synchronization raster Sync raster of the target cell, which is Cell / TRP specific Sync raster, and the synchronization signal block SSB related information of the target cell, which is Cell / TRP specific SSB related information. It can be understood that when the system information SI corresponding to a single frequency cell group indicates only a part of the access related information, the unindicated access related information can be obtained by the blind detection of the terminal equipment UE.

[0066] In this embodiment, the Cell / TRP specific SSB related information of the target cell may be SSB number, SMTC, etc.

[0067] Optionally, based on any of the above embodiments, the method further includes a step of receiving at least one of a reference signal of the target cell and system information SI corresponding to the target cell when or before a terminal equipment UE serving the SFN establishes a connection with the target cell.

[0068] Specifically, in this embodiment, the access-related information can be indicated by the system information SI of the target cell or the reference signal of the target cell, so that immediately before or before establishing a connection with the target cell, the terminal equipment UE first obtains the system information SI indication of the target cell or the reference signal of the target cell transmitted from the network side equipment, and then further obtains the access-related information to establish a connection with the target cell.

[0069] Optionally, based on any of the above embodiments, the step of receiving access-related information transmitted from a network side device during the process in which a terminal equipment UE located in the SFN establishes a connection with the SFN or after the terminal equipment UE establishes a connection with the SFN includes a step of receiving a handover command or a relocation instruction message transmitted from the network side device, and acquiring the access-related information based on the handover command or the relocation instruction message.

[0070] Specifically, in the process of establishing a connection with the SFN layer, a terminal device UE present in the SFN layer, or after the terminal device UE has already accessed the SFN layer, it can access a target cell / TRP of the cell / TRP layer based on instructions from a network side device.

[0071] Specifically, in the process of a terminal device UE present in the SFN layer establishing a connection with the SFN layer, or after the terminal device UE has already accessed the SFN layer, the network side device can send a handover command or a relocation instruction message to the terminal device UE to instruct the terminal device UE to transfer a connection to a target cell cell / TRP of the cell / TRP layer.

[0072] It can be understood that the handover command or relocation indication message includes access related information for providing the terminal equipment UE to establish a connection with the target cell, such as system information SI of the target cell or random access RACH resources related to the reference signal of the target cell, etc. The terminal equipment UE can connect to the target cell / TRP based on the access related information.

[0073] In one embodiment, the handover command or reconfiguration indication message may be a synchronous reconfiguration (reconfiguration with sync or handover command or mobility control information), i.e. the network side equipment sends an indication message to the terminal equipment UE to instruct the terminal equipment UE to perform a handover operation or change cells.

[0074] Optionally, based on any of the above embodiments, in the process of a terminal device UE located in the SFN establishing a connection with the SFN, the step of receiving access related information transmitted from a network side device includes a step of receiving a random access related message transmitted from a network side device, in which the access related information is carried in the random access related message, and the random access related message includes Message 2 in a contention-free random access process, or Message 2 or Message 4 in a contention random access process, or Message B in a two-step random access RACH process.

[0075] Specifically, in the process of a terminal device UE present in an SFN layer establishing a connection with the SFN layer, when the network side device transmits random access related information to the terminal device UE, the network side device can include access related information for instructing the terminal device UE to transition the connection to a target cell cell / TRP of the cell / TRP layer in the process of establishing a connection with the SFN layer.

[0076] Specifically, when the terminal equipment UE accesses the SFN layer, it can initiate RACH by SFN specific RACH resource. After sending the random access request, the terminal equipment UE can receive random access related information returned from the network side equipment, the random access related information carries a handover command or a relocation indication message, and the handover command or the relocation indication message includes access related information for instructing the terminal equipment UE to transfer the connection to the target cell / TRP of the cell / TRP layer. When the terminal equipment UE receives the handover command or the relocation indication message, it transfers the connection to the target cell / TRP of the cell / TRP layer and completes the connection establishment.

[0077] In an embodiment of the present application, when a terminal equipment UE located in a single-frequency network cell group needs to establish a connection with a target cell, the terminal equipment UE uses a random access-related message in the process of establishing a connection with the SFN layer to directly obtain access-related information for establishing a connection with the target cell, thereby avoiding the terminal equipment UE from frequently performing cell measurements, thereby further saving the power consumption of the terminal equipment UE and saving network overhead.

[0078] Optionally, according to any of the above embodiments, the establishment of a connection with the SFN is established based on a random access RACH resource associated with a reference signal specific to the SFN.

[0079] Specifically, in the process of a terminal device UE present in the SFN layer establishing a connection with the SFN layer, or when a terminal device UE that has already accessed the SFN layer establishes a connection with the SFN layer or initiates random access, the connection is established based on a random access RACH resource associated with a reference signal specific to the SFN.

[0080] Optionally, based on any of the above embodiments, the method further includes a step of obtaining the random access RACH resource from system information SI specific to the SFN or system information SI specific to a cell / TRP before the terminal equipment UE establishes a connection with the SFN.

[0081] Specifically, before establishing a connection based on a random access RACH resource associated with a reference signal specific to an SFN, the terminal device UE can first obtain a RACH resource associated with an SFN specific SSB from an SFN specific SI or a Cell / TRP specific SI, and establish a connection with an SFN layer based on the random access RACH resource.

[0082] Optionally, according to any of the above embodiments, the step of establishing a connection with a target cell includes initiating an RRC connection establishment or a RACH process with the target cell.

[0083] Specifically, after obtaining the access related information, the terminal equipment UE can initiate an RRC connection establishment or RACH process in a target cell based on the access related information. The target cell may be a cell / TRP currently serving or accessing within a SFN range, or a cell / TRP currently serving or accessing outside a SFN range, that is, the target cell may belong to the current SFN, or may belong to another SFN, or may not belong to any SFN.

[0084] Optionally, based on any of the above embodiments, after the terminal equipment UE establishes a connection with the SFN, the access related information includes target data link information, and the step of establishing a connection with a target cell based on the access related information includes a step of transmitting or receiving all or a part of the service data of the terminal equipment UE via the target cell based on the target data link information.

[0085] Specifically, when a terminal device UE present in the SFN layer needs to transmit data to a target cell after successfully accessing the SFN layer, it can transmit and receive all or part of the service data via the target cell based on instructions from the network side device.

[0086] Specifically, after a terminal device UE located in an SFN layer has successfully accessed the SFN layer, the terminal device UE can receive access related information sent from a network side device, and the access related information can specifically be target data link information. After receiving the access related information, the terminal device UE can transmit and receive all or part of the service data through a target cell according to the target data link information.

[0087] Specifically, transmitting or receiving all or a part of the service data through the target cell may include configuring the target cell as a secondary cell group (SCG) of one of the currently connected cells, or as a secondary cell (Scell) of one of the currently connected cells. Some conventional protocol layers may also be split into the target cell, where the conventional protocol layers include at least one of RRC, SDAP, PDCP, RLC, MAC, and PHY.

[0088] Optionally, based on any of the above embodiments, when the terminal equipment UE is located in the SFN, the method further includes a step of not performing cell reselection or cell handover when the terminal equipment UE switches between different cells / TRPs within the SFN.

[0089] Specifically, when the terminal equipment UE switches between different cells / TRPs within the SFN range, there is no need to frequently perform cell reselection or handover operations between cells, so frequent cell measurements can be avoided, which can effectively save the energy consumption of the terminal equipment UE, reduce signaling interactions when establishing a connection with a target cell, and save network overhead.

[0090] Optionally, based on any of the above embodiments, the method further includes a step in which, when the terminal equipment UE is in an inactive or idle state, it is located in the SFN, and the terminal equipment UE distinguishes between a cell / TRP-specific cell and a SFN-specific cell based on at least one of a cell identifier PCI and a synchronization raster sync Raster.

[0091] Specifically, in order to allow the terminal device UE to effectively save energy consumption, the terminal device UE can reside in the SFN layer when in an idle state or an inactive state.

[0092] In this embodiment, in the case of a terminal device UE that supports the SFN feature, it can choose to reside in the SFN layer when it is in an idle or inactive state, whereas in the case of a terminal device UE that does not support the SFN feature, it chooses to reside in the Cell / TRP layer when it is in an idle or inactive state.

[0093] Therefore, the terminal equipment UE can distinguish between the SFN layer and the cell / TRP layer based on the cell identifier PCI and / or the synchronization raster sync Raster.

[0094] For example, a cell identifier PCI or a specific synchronization raster sync Raster may be set for the SFN to distinguish the SFN from the Cell / TRP. The terminal device UE may determine that the cell it serves is an SFN layer based on the cell identifier PCI or the specific synchronization raster sync Raster for the SFN.

[0095] Optionally, based on any of the above embodiments, when the terminal equipment UE is present in the SFN, the method further includes at least one of the following steps: receiving a paging message in the SFN, where the paging message is an SFN-specific paging message or a cell / TRP-specific paging message; and receiving a system message in the SFN, where the system message is an SFN-specific system message or a cell / TRP-specific system message.

[0096] Specifically, when the terminal device UE is present in the SFN layer, it can perform at least one of the following operations 1 and 2.

[0097] In operation 1, a paging message is received at the SFN layer. The paging message may be a SFN specific paging message or a cell / TRP specific paging message.

[0098] In operation 2, a system message is received at the SFN layer. The system message may be a system message specific to the SFN (SFN specific SISI) or a system message specific to the cell / TRP (cell / TRP specific SI).

[0099] Optionally, based on any of the above embodiments, when there are high-frequency and low-frequency ranges in network deployment, the cells specific to the SFN include cells within the low-frequency range, and the cells or TRPs within the SFN include cells within the high-frequency range. Or, when the network includes a satellite communication network, the cells specific to the SFN include high-altitude platform station (HAPS) cells or geostationary satellite cells, and the cells or TRPs within the SFN include low-earth orbit satellite cells or cells covered by terrestrial base stations.

[0100] Specifically, FIG. 4 is a schematic diagram of an application scenario of high-frequency and low-frequency ranges provided in an embodiment of the present application. As shown in FIG. 4, low-frequency (e.g., FR1) cells have a larger coverage range than high-frequency (e.g., FR2) cells. When the terminal device UE moves within the FR1 coverage range, it may continuously switch FR2 cells, but the FR1 cells do not switch. When the terminal device UE initializes the activation of an FR2 cell or performs a handover of an FR2 cell, it is necessary to continuously measure the signal quality of each beam. Since the number of beams is large, the cell activation time or cell handover time becomes long. For example, when certain conditions are met, the measurement time can reach the second level, such as 8 ms + 24 * Trs + Tuncertainty_MAC + TL1-RSRP, measure + TL1-RSRP, report + THARQ + TFineTiming.

[0101] The increase in the above measurement time also leads to an increase in UE power consumption.

[0102] Therefore, when there are high-frequency and low-frequency ranges in network deployment, the cells / TRPs corresponding to the low-frequency range can be used as SFN or super cells, and the cells / TRPs corresponding to the high-frequency range can be used as cells / TRPs within the SFN / super cell.

[0103] Similarly, for a satellite communication satellite or HAPS (High Altitude Platform Station), the high-orbit satellite cell HAPS / satellite cell can be the SFN or super cell, and the cell / TRP corresponding to the low-orbit satellite within this range, or other general cell / TRP within this range, can be the cell / TRP within the SFN / super cell.

[0104] In the embodiment of the present application, when a terminal equipment UE that is present or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the terminal equipment UE directly obtains access related information for establishing a connection with the target cell from a network side device, and then establishes a connection with the target cell.Compared with the terminal equipment UE presenting in a Cell / TRP to initiate random access or establish a connection in the prior art, the terminal equipment UE avoids performing cell measurement and cell switching frequently, effectively saving the power consumption of the terminal equipment UE and saving network overhead.

[0105] FIG. 5 is a procedure diagram of another connection establishment method provided in an embodiment of the present application. As shown in FIG. 5, the method includes step 500 of sending access related information to a terminal equipment UE that is serving or connected to a single frequency network cell group SFN, the access related information is for instructing the terminal equipment UE to establish a connection with a target cell, and the target cell is a cell or a transmission / reception point specific to a Cell / TRP.

[0106] Specifically, in the prior art, the terminal equipment UE resides in the cell / TRP layer when initiating random access or connection establishment, and also resides in the cell / TRP layer when performing RACH or connection establishment, so the purpose of saving power of the terminal equipment UE cannot be achieved by effectively utilizing the residency or connection establishment in the SFN layer, and as a result, the power consumption of the terminal equipment UE becomes very high.

[0107] Therefore, in this embodiment, when the terminal equipment UE is in an idle state (Idle) or an inactive state, when the terminal equipment UE is present in a single frequency network cell group, when the terminal equipment UE is preparing to enter a connected state, or when the terminal equipment UE has already accessed the SFN layer, or in the process of establishing a connection with the SFN layer, access-related information may be sent to the terminal equipment UE so that the terminal equipment UE accesses the target cell.

[0108] Specifically, when the terminal equipment UE prepares to enter a connected state, or has already accessed the SFN layer, or in the process of establishing a connection with the SFN layer, the network side equipment can send access related information for establishing a connection with a target cell to the terminal equipment UE. In this embodiment, the access related information may be any information or combination thereof that can provide the terminal equipment UE with access resources, such as the physical layer cell identifier PCI of the target cell, the synchronization raster of the target cell, the reference signal of the target cell, and the random access RACH resource associated with the reference signal of the target cell.

[0109] After obtaining the access related information, the terminal equipment UE can establish a connection with the target cell based on the access related information.

[0110] In this embodiment, the target cell may be a cell or a transmission / reception point TRP within the SFN range, or may be a cell or a transmission / reception point TRP outside the SFN range, and this embodiment is not limited thereto.

[0111] In an embodiment of the present application, when a terminal equipment UE located in or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the network side equipment directly sends access related information for establishing a connection with the target cell to the terminal equipment UE, which avoids the terminal equipment UE from frequently performing cell measurement and cell switching compared with the prior art in which the terminal equipment UE is located in a Cell / TRP to initiate random access or establish a connection, and effectively saves the power consumption of the terminal equipment UE and saves network overhead.

[0112] Optionally, based on any of the above embodiments, before or when a terminal device UE located in the SFN establishes a connection with the target cell, the access related information includes at least one of: a physical layer cell identifier PCI of the target cell, a synchronization raster Sync raster of the target cell, a reference signal of the target cell, and a random access RACH resource associated with the reference signal of the target cell.

[0113] Specifically, when a terminal equipment UE located in an SFN layer is attempting to access the SFN layer but is not accessing it, i.e., when the terminal equipment UE located in the SFN establishes a connection with the target cell, access-related information can be sent to the terminal equipment UE so as to directly establish a connection with the target cell.

[0114] Specifically, before a terminal equipment UE located in the SFN layer establishes a connection with a target cell, a network side device can transmit access related information to the terminal equipment UE, so that the terminal equipment UE establishes a connection with the target cell based on the access related information, and the access related information may include at least one of a physical layer cell identifier PCI of the target cell, which is a Cell / TRP specific PCI, a synchronization raster of the target cell, which is a Cell / TRP specific Sync raster, a reference signal of the target cell, which may be Cell / TRP specific SSB related information such as SSB number, SMTC, etc., and a random access RACH resource related to the reference signal of the target cell, such as a preamble configuration, a random access occasion (RO) resource, and other time domain, frequency domain, or code domain resources of the RACH.

[0115] In this embodiment, the terminal equipment UE needs to perform a cell selection or reselection operation before initiating random access, and the terminal equipment UE initiates RACH random access or connection establishment on the selected / reselected target cell / TRP.

[0116] Optionally, based on any of the above embodiments, the access related information is indicated by at least one of a system information SI indication specific to the SFN, a system information SI indication of a target cell, and a reference signal indication of a target cell.

[0117] Specifically, when transmitting access-related information to the terminal equipment UE, at least one of SFN-specific system information SI, target cell system information SI, and target cell reference signal can be transmitted first, and the terminal equipment UE obtains the access-related information according to the above at least one instruction.

[0118] For example, reference information of the target cell can be first transmitted to the terminal equipment UE, and the terminal equipment UE acquires the PCI of the target cell based on the reference signal of the target cell, then acquires the system information SI of the target cell, and finally acquires the random access RACH resource associated with the reference signal of the target cell, so that the terminal equipment UE establishes a connection with the target cell based on the RACH resource.

[0119] For example, the cell / TRP specific SI of the target cell may be first transmitted to the terminal equipment UE so that the terminal equipment UE acquires the RACH resource associated with the cell / TRP specific SSB of the target cell.

[0120] Specifically, in this embodiment, the system information SI of SFN can indicate one, two, or all of three kinds of access related information, namely, the physical layer cell identifier PCI of the target cell, which is Cell / TRP specific PCI, the synchronization raster Sync raster of the target cell, which is Cell / TRP specific Sync raster, and the synchronization signal block SSB related information of the target cell, which is Cell / TRP specific SSB related information. It can be understood that when the system information SI corresponding to a single frequency cell group indicates only a part of the access related information, the unindicated access related information can be obtained by the blind detection of the terminal equipment UE.

[0121] In this embodiment, the Cell / TRP specific SSB related information of the target cell may be, for example, SSB number, SMTC, etc.

[0122] Optionally, based on any of the above embodiments, the method further includes a step of transmitting at least one of a reference signal of the target cell and system information SI corresponding to the target cell to the terminal equipment UE when the terminal equipment UE located in the SFN establishes a connection with the target cell or before establishing the connection.

[0123] Specifically, in this embodiment, the access-related information can be indicated by the system information SI of the target cell or a reference signal of the target cell, so that the network side equipment can transmit a system information SI indication of the target cell or a reference signal of the target cell to the terminal equipment UE immediately before or before establishing a connection with the target cell, so that the terminal equipment UE obtains the access-related information and establishes a connection with the target cell.

[0124] Optionally, based on any of the above embodiments, the step of transmitting access-related information during the process in which a terminal equipment UE located in the SFN establishes a connection with the SFN or after the terminal equipment UE establishes a connection with the SFN includes a step of transmitting a handover command or a relocation indication message to the terminal equipment UE, and the handover command or the relocation indication message is for the terminal equipment UE to obtain the access-related information.

[0125] Specifically, in the process of establishing a connection with the SFN layer, a terminal device UE present in the SFN layer, or after the terminal device UE has already accessed the SFN layer, it can access a target cell / TRP of the cell / TRP layer based on instructions from the network side.

[0126] Specifically, in the process of a terminal device UE present in the SFN layer establishing a connection with the SFN layer, or after the terminal device UE has already accessed the SFN layer, the network side device can send a handover command or a relocation instruction message to the terminal device UE to instruct the terminal device UE to transfer a connection to a target cell cell / TRP of the cell / TRP layer.

[0127] It can be understood that the handover command or relocation indication message includes access related information for providing the terminal equipment UE to establish a connection with the target cell, such as system information SI of the target cell or random access RACH resources related to the reference signal of the target cell, etc. The terminal equipment UE can connect to the target cell / TRP based on the access related information.

[0128] In one embodiment, the handover command or reconfiguration indication message may be a synchronous reconfiguration (reconfiguration with sync or handover command or mobility control information), i.e. the network side equipment sends an indication message to the terminal equipment UE to instruct the terminal equipment UE to perform a handover operation or change cells.

[0129] Optionally, based on any of the above embodiments, in the process of a terminal equipment UE located in the SFN establishing a connection with the SFN, the step of transmitting access related information includes a step of transmitting a random access related message to the terminal equipment UE, the random access related message carrying the access related information, and the random access related message includes Message 2 in a contention-free random access process, or Message 2 or Message 4 in a contention random access process, or Message B in a two-step random access RACH process.

[0130] Specifically, in the process of a terminal device UE present in an SFN layer establishing a connection with the SFN layer, when the network side device transmits random access related information to the terminal device UE, the network side device can include access related information for instructing the terminal device UE to transition the connection to a target cell cell / TRP of the cell / TRP layer in the process of establishing a connection with the SFN layer.

[0131] Specifically, when the terminal equipment UE accesses the SFN layer, the terminal equipment UE can initiate RACH by SFN specific RACH resource. After receiving the random access request of the terminal equipment UE, the network side equipment can return random access related information to the terminal equipment UE, and the random access related information carries a handover command or a relocation indication message, and the handover command or the relocation indication message includes access related information for instructing the terminal equipment UE to transfer the connection to the target cell cell / TRP of the cell / TRP layer. When the terminal equipment UE receives the handover command or the relocation indication message, it transfers the connection to the target cell cell / TRP of the cell / TRP layer and completes the connection establishment.

[0132] In an embodiment of the present application, when a terminal equipment UE located in a single-frequency network cell group needs to establish a connection with a target cell, the network side equipment uses a random access-related message in the process of establishing a connection with an SFN layer to carry access-related information for the terminal equipment UE to establish a connection with the target cell, thereby avoiding the terminal equipment UE from frequently performing cell measurements, thereby further saving the power consumption of the terminal equipment UE and saving network overhead.

[0133] Optionally, based on any of the above embodiments, after the terminal equipment UE establishes a connection with the SFN, the access related information includes target data link information, and the target data link information is for instructing the terminal equipment UE to transmit or receive all or a part of its service data via a target cell.

[0134] Specifically, when a terminal device UE present in an SFN layer needs to transmit data to a target cell after having already successfully accessed the SFN layer, the network side device can instruct the terminal device UE to transmit and receive all or part of the service data via the target cell.

[0135] Specifically, after a terminal device UE located in an SFN layer has successfully accessed the SFN layer, a network side device can send access related information to the terminal device UE, and the access related information can specifically be target data link information. After receiving the access related information, the terminal device UE can transmit or receive all or part of service data through a target cell according to the target data link information.

[0136] Optionally, based on any of the above embodiments, when a terminal equipment UE is located in the SFN, the method further includes at least one of the following steps: sending a paging message to the terminal equipment UE located in the SFN, where the paging message is an SFN-specific paging message or a cell / TRP-specific paging message; and sending a system message to the terminal equipment UE located in the SFN, where the system message is an SFN-specific system message or a cell / TRP-specific system message.

[0137] Specifically, when the terminal device UE is present in the SFN layer, it can perform at least one of the following operations 1 and 2.

[0138] In operation 1, a paging message is sent to a terminal device UE located in the SFN. The paging message may be a paging message specific to the SFN (SFN specific paging) or a paging message specific to a cell / TRP (cell / TRP specific paging).

[0139] In operation 2, a system message is sent to a terminal device UE that is located in the SFN. The system message may be a system message specific to the SFN (SFN specific SISI) or a system message specific to the cell / TRP (cell / TRP specific SI).

[0140] Optionally, based on any of the above embodiments, if the network deployment has a high frequency range and a low frequency range, the cells specific to the SFN include cells in the low frequency range, and the cells or TRPs in the SFN include cells in the high frequency range, or if the network includes a satellite communication network, the cells specific to the SFN include high altitude platform station (HAPS) cells or high orbit satellite cells, and the cells or TRPs in the SFN include low orbit satellite cells or cells covered by terrestrial base stations.

[0141] Specifically, when a network deployment has high-frequency layers and low-frequency layers, a cell / TRP corresponding to the low-frequency layer can be an SFN or a super cell, and a cell / TRP corresponding to the high-frequency layer can be a cell / TRP in the SFN / super cell.

[0142] Similarly, for a satellite communication satellite or HAPS (High Altitude Platform Station), the high-orbit satellite cell HAPS / satellite cell can be the SFN or super cell, and the cell / TRP corresponding to the low-orbit satellite within this range, or other general cell / TRP within this range, can be the cell / TRP within the SFN / super cell.

[0143] In an embodiment of the present application, when a terminal equipment UE located in or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the network side equipment directly sends access related information for establishing a connection with the target cell to the terminal equipment UE, which avoids the terminal equipment UE from frequently performing cell measurement and cell switching compared with the prior art in which the terminal equipment UE is located in a Cell / TRP to initiate random access or establish a connection, and effectively saves the power consumption of the terminal equipment UE and saves network overhead.

[0144] It should be noted that the execution subject of the connection establishment method provided in the embodiment of the present application may be a connection establishment device, or may be a control module in the connection establishment device for executing and loading the connection establishment method. In the embodiment of the present application, the connection establishment method provided in the embodiment of the present application will be described by taking the connection establishment device executing and loading the connection establishment method as an example.

[0145] FIG. 6 is a procedure diagram of yet another connection establishment method provided in an embodiment of the present application. As shown in FIG. 6, the method includes the following steps 600 to 620.

[0146] In step 600, the terminal device UE accesses the SFN layer.

[0147] Specifically, the terminal device UE changes from a state in which it is present in the single frequency cell group SFN layer to a state in which it has successfully accessed the single frequency cell group SFN layer, i.e., a state in which it has established a connection with the SFN layer or a cell within the SFN layer.

[0148] In step 610, the terminal equipment UE receives a handover command or a relocation indication message sent from a network side equipment.

[0149] Specifically, the network side equipment can send a handover command or a relocation indication message to the terminal equipment UE after the terminal equipment UE accesses the SFN layer.

[0150] After receiving the relocation instruction message, the terminal can obtain access-related information for establishing a connection with the target cell, such as the system information SI of the target cell or a random access RACH resource associated with the reference signal of the target cell, based on the handover command or the relocation instruction message.

[0151] In step 620, the terminal equipment UE establishes a connection with the target cell.

[0152] Specifically, after the terminal equipment UE obtains access related information for establishing a connection with a target cell, it can initiate an RRC connection establishment or a RACH process in the target cell based on the access related information, and establish a connection with the target cell.

[0153] FIG. 7 is a process diagram of yet another connection establishment method provided in an embodiment of the present application. As shown in FIG.

[0154] In step 700, the terminal device UE accesses the SFN layer.

[0155] Specifically, the terminal device UE changes from a state in which it is present in the SFN layer to a state in which it has accessed the SFN layer, that is, to a process of establishing a connection with the SFN layer.

[0156] In step 710, the terminal equipment UE receives access related information sent from the network side equipment.

[0157] Specifically, when the terminal equipment UE accesses the SFN layer, i.e., when the terminal equipment UE starts a RACH in the SFN layer, the network side equipment can transmit random access related information to the terminal equipment UE, and carry a handover command or a relocation indication message in the random access related information.

[0158] After receiving the random access related information and obtaining the handover command or relocation indication message carried therein, the terminal equipment UE can obtain access related information for establishing a connection with the target cell based on the handover command or relocation indication message, such as the system information SI of the target cell or the random access RACH resource related to the reference signal of the target cell.

[0159] Specifically, when the random access process in the SFN layer of the terminal equipment UE is a contention-free random access process, the random access related information is Message 2; when the random access process in the SFN layer of the terminal equipment UE is a contention random access process, the random access related information is Message 4; and when the random access process in the SFN layer of the terminal equipment UE is a two-step contention random access process RACH, the random access related information is Message B.

[0160] In step 720, the terminal equipment UE establishes a connection with the target cell.

[0161] Specifically, after the terminal equipment UE obtains access related information for establishing a connection with a target cell, it can initiate an RRC connection establishment or a RACH process in the target cell based on the access related information, and establish a connection with the target cell.

[0162] FIG. 8 is a procedure diagram of yet another connection establishment method provided in an embodiment of the present application. As shown in FIG. 8, the method includes the following steps 800 to 830.

[0163] In step 800, the terminal device UE prepares to access the SFN layer.

[0164] Specifically, the terminal equipment UE changes from a state in which it is present in the SFN layer to a state in which it is preparing to access the SFN layer, that is, the terminal equipment UE is in a state immediately before establishing a connection with a cell in a single frequency cell group.

[0165] In step 810, the terminal equipment UE obtains system information SI specific to the SFN.

[0166] Specifically, when the terminal equipment UE is attempting to access the SFN layer but is not accessing it, i.e., when the terminal equipment UE located in the SFN establishes a connection with the target cell, the network side equipment can provide the terminal equipment UE with SFN-specific system information SI or the target cell's system information SI or the target cell's reference signal to indicate access-related information, and in this embodiment, the SFN-specific system information SI may be described as an example.

[0167] In step 820, the terminal equipment UE obtains access related information for establishing a connection with the target cell.

[0168] After obtaining the SFN-specific system information SI, the terminal equipment UE can obtain access related information based on the SFN-specific system information SI.

[0169] The access related information is at least one of: a physical layer cell identifier PCI of the target cell, a synchronization raster Sync raster of the target cell, a reference signal of the target cell, and a random access RACH resource associated with the reference signal of the target cell.

[0170] In step 830, the terminal equipment UE establishes a connection with the target cell.

[0171] Specifically, after the terminal equipment UE obtains access related information for establishing a connection with a target cell, it can initiate an RRC connection establishment or a RACH process in the target cell based on the access related information, and establish a connection with the target cell.

[0172] FIG. 9 is a procedure diagram of yet another connection establishment method provided in an embodiment of the present application. As shown in FIG. 9, the method includes the following steps 900 to 920.

[0173] In step 900, the terminal device UE accesses the SFN layer.

[0174] Specifically, the terminal device UE changes from a state in which it is present in the single frequency cell group SFN layer to a state in which it has successfully accessed the SFN layer, that is, a state in which it has established a connection with the SFN layer or a cell in the SFN layer.

[0175] In step 910, the terminal equipment UE receives access related information sent from the network side equipment.

[0176] Specifically, the network side equipment can send access related information to the terminal equipment UE after the terminal equipment UE accesses the SFN layer, and in this embodiment, the access related information can be target data link information.

[0177] After receiving the access related information, the terminal equipment UE can obtain target data link information for transmitting data to the target cell according to the access related information.

[0178] In step 920, the terminal equipment UE transmits or receives all or a part of the service data via the target cell.

[0179] Specifically, after obtaining the target data link information, the terminal equipment UE can transmit and receive all or part of the service data through the target cell.

[0180] It should be noted that the execution subject of the connection establishment method provided in the embodiment of the present application may be a connection establishment device, or may be a control module in the connection establishment device for executing the connection establishment method. In the embodiment of the present application, the connection establishment device provided in the embodiment of the present application is described by taking the connection establishment method being executed by the connection establishment device as an example.

[0181] FIG. 10 is a structural schematic diagram of a connection establishment device provided in an embodiment of the present application. As shown in FIG. 10, the device includes: a first receiving module 1010 for a terminal equipment UE located in or connected to a single frequency network cell group SFN to receive access related information sent from a network side equipment; and a connection module 1020 for establishing a connection with a target cell based on the access related information, where the target cell is a cell or a transmission / reception point specific to a Cell / TRP.

[0182] Specifically, when the terminal equipment UE is present in or connected to a single frequency network cell group SFN, the connection establishment device obtains access related information transmitted from the network side equipment via the first receiving module 1010, and establishes a connection with the target cell based on the access related information via the connection module 1020.

[0183] In the embodiment of the present application, when a terminal equipment UE that is present or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the terminal equipment UE directly obtains access related information for establishing a connection with the target cell from a network side device, and then establishes a connection with the target cell.Compared with the terminal equipment UE presenting in a Cell / TRP to initiate random access or establish a connection in the prior art, the terminal equipment UE avoids performing cell measurement and cell switching frequently, effectively saving the power consumption of the terminal equipment UE and saving network overhead.

[0184] Optionally, based on any of the above embodiments, before or when a terminal device UE located in the SFN establishes a connection with the target cell, the access related information includes at least one of: a physical layer cell identifier PCI of the target cell, a synchronization raster Sync raster of the target cell, a reference signal of the target cell, and a random access RACH resource associated with the reference signal of the target cell.

[0185] Optionally, based on any of the above embodiments, the access related information is indicated by at least one of a system information SI indication specific to the SFN, a system information SI indication of a target cell, and a reference signal indication of a target cell.

[0186] Optionally, based on any of the above embodiments, the apparatus further includes a second receiving module for receiving at least one of a reference signal of a target cell and system information SI corresponding to the target cell when or before a terminal equipment UE located in the SFN establishes a connection with the target cell.

[0187] Optionally, according to any of the above embodiments, in the process in which a terminal device UE located in the SFN establishes a connection with the SFN or after the terminal device UE establishes a connection with the SFN, the receiving module further comprises: It is used to receive a handover command or a relocation indication message sent from a network side device, and obtain the access related information based on the handover command or the relocation indication message.

[0188] Optionally, based on any of the above embodiments, in a process in which a terminal device UE located in the SFN establishes a connection with the SFN, the receiving module is further used to receive a random access related message sent from a network side device, and the random access related message carries the access related information, and the random access related message includes Message 2 in a contention-free random access process, or Message 2 or Message 4 in a contention random access process, or Message B in a two-step random access RACH process.

[0189] Optionally, according to any of the above embodiments, the establishment of a connection with the SFN is established based on a random access RACH resource associated with a reference signal specific to the SFN.

[0190] Optionally, based on any of the above embodiments, the device further includes an acquisition module for acquiring the random access RACH resource from system information SI specific to the SFN or system information SI specific to a cell / TRP before the terminal equipment UE establishes a connection with the SFN.

[0191] Optionally, according to any of the above embodiments, the step of establishing a connection with a target cell includes initiating an RRC connection establishment or a RACH process with the target cell.

[0192] Optionally, according to any of the above embodiments, after the terminal device UE establishes a connection with the SFN, the access related information includes target data link information.

[0193] The connection module is further used for transmitting or receiving all or a part of the service data of the terminal equipment UE via the target cell based on the target data link information.

[0194] Optionally, based on any of the above embodiments, the apparatus further comprises a handover module for not performing cell reselection or cell handover when the terminal equipment UE is switched between different cells / TRPs within the SFN range when the terminal equipment UE is located in the SFN.

[0195] Optionally, based on any of the above embodiments, the device further comprises a serving module for serving the SFN when the terminal equipment UE is in an inactive or idle state, and the terminal equipment UE distinguishes between a cell / TRP-specific cell and a SFN-specific cell based on at least one of a cell identifier PCI and a synchronization raster sync Raster.

[0196] Optionally, based on any of the above embodiments, the device further includes at least one of a third receiving module for receiving a paging message at the SFN when the terminal equipment UE is present in the SFN, where the paging message is an SFN-specific paging message or a cell / TRP-specific paging message, and a fourth receiving module for receiving a system message at the SFN, where the system message is an SFN-specific system message or a cell / TRP-specific system message.

[0197] Optionally, based on any of the above embodiments, if the network deployment has a high frequency range and a low frequency range, the cells specific to the SFN include cells in the low frequency range, and the cells or TRPs in the SFN include cells in the high frequency range, or if the network includes a satellite communication network, the cells specific to the SFN include high altitude platform station (HAPS) cells or high orbit satellite cells, and the cells or TRPs in the SFN include low orbit satellite cells or cells covered by terrestrial base stations.

[0198] In the embodiment of the present application, when a terminal equipment UE that is present or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the terminal equipment UE directly obtains access related information for establishing a connection with the target cell from a network side device, and then establishes a connection with the target cell.Compared with the terminal equipment UE presenting in a Cell / TRP to initiate random access or establish a connection in the prior art, the terminal equipment UE avoids performing cell measurement and cell switching frequently, effectively saving the power consumption of the terminal equipment UE and saving network overhead.

[0199] FIG. 11 is a structural schematic diagram of another connection establishment device provided in an embodiment of the present application. As shown in FIG. 11, the device includes a first sending module 1110 for sending access related information to a terminal equipment UE that is located in or connected to a single frequency network cell group SFN, and the access related information is for instructing the terminal equipment UE to establish a connection with a target cell, and the target cell is a cell or a transmission / reception point specific to a Cell / TRP.

[0200] Specifically, when the terminal equipment UE is in or connected to a single frequency network cell group SFN, the connection establishment device transmits access related information to the terminal equipment UE via the first transmitting module 1110, so that the terminal equipment UE establishes a connection with a target cell based on the access related information.

[0201] In an embodiment of the present application, when a terminal equipment UE located in or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the network side equipment directly sends access related information for establishing a connection with the target cell to the terminal equipment UE, which avoids the terminal equipment UE from frequently performing cell measurement and cell switching compared with the prior art in which the terminal equipment UE is located in a Cell / TRP to initiate random access or establish a connection, and effectively saves the power consumption of the terminal equipment UE and saves network overhead.

[0202] Optionally, based on any of the above embodiments, before or when a terminal device UE located in the SFN establishes a connection with the target cell, the access related information includes at least one of: a physical layer cell identifier PCI of the target cell, a synchronization raster Sync raster of the target cell, a reference signal of the target cell, and a random access RACH resource associated with the reference signal of the target cell.

[0203] Optionally, based on any of the above embodiments, the access related information is indicated by at least one of a system information SI indication specific to the SFN, a system information SI indication of a target cell, and a reference signal indication of a target cell.

[0204] Optionally, based on any of the above embodiments, the apparatus further includes a second transmitting module for transmitting at least one of a reference signal of the target cell and system information SI corresponding to the target cell to the terminal equipment UE when or before the terminal equipment UE located in the SFN establishes a connection with the target cell.

[0205] Optionally, based on any of the above embodiments, in the process of a terminal equipment UE located in the SFN establishing a connection with the SFN or after the terminal equipment UE has established a connection with the SFN, the first sending module is further used for sending a handover command or a relocation indication message to the terminal equipment UE, and the handover command or the relocation indication message is for the terminal equipment UE to obtain the access-related information.

[0206] Optionally, based on any of the above embodiments, in a process in which a terminal equipment UE located in the SFN establishes a connection with the SFN, the first sending module is further used to send a random access related message to the terminal equipment UE, and the random access related message carries the access related information, and the random access related message includes Message 2 in a contention-free random access process, or Message 2 or Message 4 in a contention random access process, or Message B in a two-step random access RACH process.

[0207] Optionally, based on any of the above embodiments, after the terminal equipment UE establishes a connection with the SFN, the access related information includes target data link information, and the target data link information is for instructing the terminal equipment UE to transmit or receive all or a part of its service data via a target cell.

[0208] Optionally, based on any of the above embodiments, the device further includes at least one of: a third transmission module for transmitting a paging message to a terminal equipment UE located in the SFN when the terminal equipment UE is located in the SFN, where the paging message is an SFN-specific paging message or a cell / TRP-specific paging message; and a fourth transmission module for transmitting a system message to a terminal equipment UE located in the SFN, where the system message is an SFN-specific system message or a cell / TRP-specific system message.

[0209] Optionally, based on any of the above embodiments, if the network deployment has a high frequency range and a low frequency range, the cells specific to the SFN include cells in the low frequency range, and the cells or TRPs in the SFN include cells in the high frequency range, or if the network includes a satellite communication network, the cells specific to the SFN include high altitude platform station (HAPS) cells or high orbit satellite cells, and the cells or TRPs in the SFN include low orbit satellite cells or cells covered by terrestrial base stations.

[0210] In an embodiment of the present application, when a terminal equipment UE located in or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the network side equipment directly sends access related information for establishing a connection with the target cell to the terminal equipment UE, which avoids the terminal equipment UE from frequently performing cell measurement and cell switching compared with the prior art in which the terminal equipment UE is located in a Cell / TRP to initiate random access or establish a connection, and effectively saves the power consumption of the terminal equipment UE and saves network overhead.

[0211] The connection establishment device in the embodiment of the present application may be a device, and may be a component, integrated circuit, or chip in a terminal device UE. The device may be a portable electronic device or a non-portable electronic device. Exemplarily, the portable electronic device may be a mobile phone, a tablet personal computer, a notebook computer, a personal digital assistant, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and the non-portable electronic device may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), an automated teller machine, or a kiosk terminal, etc., and is not specifically limited in the embodiment of the present application.

[0212] The connection establishment device in the embodiment of the present application may be a device having an operating system, which may be the Android operating system, the ios operating system, or other possible operating systems, and is not specifically limited in the embodiment of the present application.

[0213] The connection establishment device provided in the embodiment of the present application can realize each step implemented by the connection establishment device in the method embodiment of FIG. 3 to FIG. 9, and detailed description will be omitted here to avoid duplication.

[0214] FIG. 12 is a hardware structure schematic diagram of a terminal device UE for implementing an embodiment of the present application.

[0215] The terminal equipment UE 1200 includes components such as, but not limited to, a radio frequency unit 1201, a network module 1202, an audio output unit 1203, an input unit 1204, a sensor 1205, a display unit 1206, a user input unit 1207, an interface unit 1208, a memory 1209, and a processor 1210.

[0216] Those skilled in the art will understand that the terminal equipment UE 1200 may further include a power source (e.g., a battery) for powering each component, and that the power source is logically connected to the processor 1210 by a power management system, which can further realize functions such as charge / discharge management and power consumption management. The structure of the terminal equipment UE shown in FIG. 12 does not limit the terminal equipment UE, and the terminal equipment UE may include more or fewer components than those shown, or a combination of some components, or a different component arrangement, and detailed explanations are omitted here.

[0217] It should be understood that in the embodiment of the present application, the input unit 1204 may include a graphics processing unit (GPU) 12041 for processing image data of still or video captured by an image capture device (e.g., a camera) in a video capture mode or an image capture mode, and a microphone 12042. The display unit 1206 may include a display panel 12061, and the display panel 12061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1207 includes a touch panel 12071 and other input devices 12072. The touch panel 12071 is also called a touch screen. The touch panel 12071 may include two parts, a touch detection device and a touch controller. The other input devices 12072 may include, but are not limited to, a physical keyboard, a function button (e.g., a volume control button, a switch button, etc.), a trackball, a mouse, and an operation lever, and detailed description thereof will be omitted here.

[0218] In the embodiment of the present application, the high frequency unit 1201 receives information from the network side device and then processes it in the processor 1210. Typically, the high frequency unit 1201 includes, but is not limited to, an antenna, at least one amplifier, a receiver-transmitter, a coupler, a low-noise amplifier, a duplexer, and the like.

[0219] The memory 1209 can be used to store software programs or commands and various data. The memory 1209 may mainly include a program or command storage area capable of storing an operating system, an application program or command required for at least one function (e.g., audio playback function, image playback function, etc.), and a data storage area. The memory 1209 may also include a high-speed random access memory and may further include a non-volatile memory, where the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. For example, at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0220] The processor 1210 may include one or more processing units. Optionally, an application processor and a modulation and demodulation processor may be integrated into the processor 1210. The application processor mainly processes an operating system, a user interface, and application programs or commands, and the modulation and demodulation processor mainly processes wireless communication, such as a baseband processor. It should be understood that the modulation and demodulation processor may not be integrated into the processor 1210.

[0221] The processor 1210 is used for establishing a connection with a target cell based on the access related information, the target cell being a cell or transmission / reception point specific to a Cell / TRP.

[0222] The processor 1210 is further used for receiving at least one of a reference signal of the target cell and system information SI corresponding to the target cell when or before a terminal equipment UE located in the SFN establishes a connection with the target cell.

[0223] Optionally, the processor 1210 is further used to receive a handover command or a relocation indication message sent from a network side equipment in the process of a terminal equipment UE located in the SFN establishing a connection with the SFN or after the terminal equipment UE has established a connection with the SFN, and to obtain the access-related information based on the handover command or the relocation indication message.

[0224] Optionally, the processor 1210 is further used to receive a random access related message sent from a network side device in a process in which a terminal equipment UE located in the SFN establishes a connection with the SFN, and the random access related message carries the access related information, and the random access related message includes Message 2 in a contention-free random access process, or Message 2 or Message 4 in a contention random access process, or Message B in a two-step random access RACH process.

[0225] Optionally, the processor 1210 is further used for obtaining the random access RACH resource from system information SI specific to the SFN or system information SI specific to a cell / TRP before the terminal equipment UE establishes a connection with the SFN.

[0226] Optionally, the processor 1210 is further used for initiating an RRC connection establishment or a RACH process with the target cell.

[0227] Optionally, the processor 1210 is further used to transmit or receive all or a part of the service data of the terminal equipment UE via a target cell based on the target data link information after the terminal equipment UE establishes a connection with the SFN, and the access related information includes the target data link information.

[0228] Optionally, the processor 1210 is further configured to not perform cell reselection or cell handover when the terminal equipment UE is located in the SFN and the terminal equipment UE switches between different cells / TRPs within the SFN.

[0229] Optionally, the processor 1210 is further used to camp on the SFN when the terminal equipment UE is in an inactive or idle state, and the terminal equipment UE distinguishes between a cell / TRP-specific cell and a SFN-specific cell based on at least one of a cell identifier PCI and a synchronization raster sync Raster.

[0230] Optionally, processor 1210 is further used to perform at least one of the following steps: receiving a paging message at the SFN, wherein the paging message is an SFN-specific paging message or a cell / TRP-specific paging message; and receiving a system message at the SFN, wherein the system message is an SFN-specific system message or a cell / TRP-specific system message.

[0231] In the embodiment of the present application, when a terminal equipment UE that is present or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the terminal equipment UE directly obtains access related information for establishing a connection with the target cell from a network side device, and then establishes a connection with the target cell.Compared with the terminal equipment UE presenting in a Cell / TRP to initiate random access or establish a connection in the prior art, the terminal equipment UE avoids performing cell measurement and cell switching frequently, effectively saving the power consumption of the terminal equipment UE and saving network overhead.

[0232] FIG. 13 is a schematic diagram of the hardware structure of a network side device for implementing an embodiment of the present application.

[0233] As shown in Fig. 13, the network side device 1300 includes an antenna 1301, a high frequency device 1302, and a baseband device 1303. The antenna 1301 is connected to the high frequency device 1302. In the uplink direction, the high frequency device 1302 receives information through the antenna 1301, and transmits the received information to the baseband device 1303 for processing. In the downlink direction, the baseband device 1303 processes the information to be transmitted and transmits it to the high frequency device 1302, and the high frequency device 1302 transmits the received information through the antenna 1301 after processing it.

[0234] The above-mentioned band processing device may be located in the baseband device 1303, and in the above embodiment, the method performed by the network side equipment may be realized in the baseband device 1303, which includes a processor 1304 and a memory 1305.

[0235] The baseband device 1303 may, for example, include at least one baseband board on which multiple chips are installed, and as shown in FIG. 13, one of the chips is, for example, a processor 1304 connected to a memory 1305 and calling a program in the memory 1305 to perform the operations of the network equipment shown in the above method embodiments.

[0236] The baseband device 1303 may further include a network interface 1306 for exchanging information with the radio frequency device 1302, the interface being, for example, a common public radio interface (abbreviated as CPRI).

[0237] Specifically, the network side device of the embodiment of the present invention further includes instructions or programs stored in memory 1305 and executable by processor 1304, and processor 1304 calls the instructions or programs in memory 1305 to execute the methods performed by each module shown in Fig. 11 to achieve similar technical effects. To avoid duplication, detailed descriptions are omitted here.

[0238] In an embodiment of the present application, when a terminal equipment UE located in or connected to a single frequency network cell group SFN needs to establish a connection with a target cell, the network side equipment directly sends access related information for establishing a connection with the target cell to the terminal equipment UE, which avoids the terminal equipment UE from frequently performing cell measurement and cell switching compared with the prior art in which the terminal equipment UE is located in a Cell / TRP to initiate random access or establish a connection, and effectively saves the power consumption of the terminal equipment UE and saves network overhead.

[0239] The embodiments of the present application further provide a readable storage medium, which stores a program or command, and when the program or command is executed by a processor, each step of the embodiment of the connection establishment method described above is realized, and the same technical effect can be achieved. In order to avoid duplication, detailed description is omitted here.

[0240] The processor is a processor in the terminal device UE or the network side device described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0241] The embodiments of the present application further provide a chip, the chip comprising a processor and a communication interface, the communication interface and the processor are coupled together, and the processor is used to execute programs or commands to realize each step of the embodiments of the above connection establishment method, and can achieve the same technical effects. In order to avoid duplication, detailed description is omitted here.

[0242] It should be understood that the chips referred to in the embodiments of this application may also be referred to as systems on chips, system chips, chip systems, or systems on chips, and the like.

[0243] The embodiments of the present application further provide a program product, which is stored in a non-volatile readable storage medium, and when executed by a processor, the program product realizes each step of the embodiments of the above connection establishment method, and can achieve the same technical effects. In order to avoid duplication, detailed descriptions are omitted here.

[0244] It should be noted that in this specification, the terms "comprise", "consist of" or any other variations are intended to include a non-exclusive inclusion, whereby a process, method, article, or apparatus that includes a set of elements includes not only those elements, but also other elements not expressly stated or inherent to such process, method, article, or apparatus. Unless otherwise specified, an element limited by the phrase "comprises a" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element. It should also be noted that the scope of the method and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may include performing functions substantially simultaneously or in the reverse order depending on such functions, for example, the described method may be performed in a different order than described, and various steps may be added, omitted, or combined. Also, features described with reference to any example may be combined in other examples.

[0245] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be realized in the form of a combination of software and a necessary common hardware platform, and of course, they can be realized by hardware, but in many cases the former is a more preferred embodiment. Based on this view, the technical solution of the present application can be substantially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes a number of commands that cause a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the embodiments of the present application.

[0246] Although the examples of the present application have been described above with reference to the drawings, the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative and not limiting. Based on the suggestions of the present application, many forms that a person skilled in the art can make without departing from the spirit of the present application and the scope of protection of the claims are all within the scope of protection of the present application.

Claims

1. A terminal device UE that is present in or connected to a single frequency network cell group SFN receives access related information transmitted from a network side device; establishing a connection with a target cell based on the access related information; The target cell is a specific cell or transmission / reception point corresponding to one SFN layer, The access related information includes a physical layer cell identifier PCI of a target cell.

2. Before or when a terminal device UE located in the SFN establishes a connection with the target cell, the access related information is: the Sync raster of the target cell; A reference signal of a target cell; a random access RACH resource associated with a reference signal of the target cell; The access-related information is a system information (SI) indication specific to the SFN; a system information (SI) indication of the target cell; 3. The connection establishment method of claim 1, wherein the connection establishment is indicated by at least one of: a reference signal indication of the target cell;

3. When or before a terminal device UE located in the SFN establishes a connection with a target cell, A reference signal of a target cell; 2. The connection establishment method of claim 1, further comprising the step of receiving at least one of: a) system information SI corresponding to the target cell;

4. The step of receiving access-related information transmitted from a network side device in the process of a terminal device UE existing in the SFN establishing a connection with the SFN or after the terminal device UE establishes a connection with the SFN, The connection establishment method according to claim 1 , comprising: receiving a handover command or a relocation indication message sent from a network side device; and obtaining the access related information based on the handover command or the relocation indication message.

5. The step of receiving access-related information transmitted from a network side device in a process in which a terminal device UE existing in the SFN establishes a connection with the SFN, receiving a random access related message transmitted from a network side device, the random access related message carrying the access related information; 2. The connection establishment method according to claim 1, wherein the random access related message comprises: Message 2 in a contention-free random access process, or Message 2 or Message 4 in a contention random access process, or Message B in a two-step random access RACH process.

6. When the terminal equipment UE is present in the SFN, The connection establishment method according to any one of claims 1 to 5, further comprising the step of not performing cell reselection or cell handover when the terminal equipment UE switches between different cells or transmission / reception points within a SFN range.

7. When the terminal equipment UE is in an inactive state or an idle state, the terminal equipment UE is present in the SFN, A cell identifier PCI; 2. The connection establishment method according to claim 1, further comprising the step of distinguishing between cells or transmission / reception point specific cells and said SFN specific cells based on at least one of: a synchronization raster sync Raster;

8. When the terminal equipment UE is present in the SFN, receiving a paging message at the SFN, the paging message being a SFN-specific paging message or a cell or transmission / reception point-specific paging message; 2. The connection establishment method according to claim 1, further comprising at least one of the steps of: receiving a system message at the SFN, the system message being a SFN-specific system message or a cell or transmission / reception point-specific system message.

9. Sending access related information to a terminal device UE serving or connected to a single frequency network cell group SFN; The access related information is for instructing the terminal equipment UE to establish a connection with a target cell, The target cell is a specific cell or transmission / reception point corresponding to one SFN layer, The access related information includes a physical layer cell identifier PCI of a target cell.

10. Before or when a terminal device UE located in the SFN establishes a connection with the target cell, the access related information is: the Sync raster of the target cell; A reference signal of a target cell; a random access RACH resource associated with a reference signal of the target cell; The access-related information is a system information (SI) indication specific to the SFN; a system information (SI) indication of the target cell; and a reference signal indication of the target cell.

11. When or before a terminal device UE located in the SFN establishes a connection with a target cell, A reference signal of a target cell; The connection establishment method according to claim 9, further comprising the step of transmitting at least one of: a) system information SI corresponding to the target cell to the terminal equipment UE.

12. The step of transmitting access-related information in the process of a terminal device UE existing in the SFN establishing a connection with the SFN or after the terminal device UE establishes a connection with the SFN, Sending a handover command or relocation indication message to a terminal device UE, the handover command or relocation indication message being for the terminal device UE to obtain the access related information; or The step of transmitting access-related information in a process in which a terminal device UE existing in the SFN establishes a connection with the SFN, transmitting a random access related message to a terminal device UE, the random access related message being loaded with the access related information; 10. The connection establishment method according to claim 9, wherein the random access related message comprises: Message 2 in a contention-free random access process, or Message 2 or Message 4 in a contention random access process, or Message B in a two-step random access RACH process.

13. When the terminal equipment UE is present in the SFN, sending a paging message to a terminal device UE serving the SFN, the paging message being a SFN-specific paging message or a cell or transmission / reception point-specific paging message; 10. The connection establishment method according to claim 9, further comprising at least one of the steps of: transmitting a system message to a terminal device UE located in the SFN, the system message being a SFN-specific system message or a cell or transmission / reception point-specific system message.

14. A terminal device UE comprising a processor, a memory, and a program or command stored in the memory and executable by the processor, the program or command being executed by the processor to realize steps of the connection establishment method according to any one of claims 1 to 8.

15. A network side device comprising a processor, a memory, and a program or command stored in the memory and executable by the processor, the program or command realizing steps of the connection establishment method according to any one of claims 9 to 13 when executed by the processor.

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