Transmit-receive time sequence control method and device of cooperative frequency switching network, and communication system

Abstract

The invention relates to the technical field of wireless communication, and particularly discloses a receiving and transmitting time sequence control method and device of a cooperative frequency switching network and a communication system, and the method comprises the steps: obtaining an air interface time sequence of a current service base station; determining a first time sequence constraint condition of a service base station guard module according to the air interface time sequence of the current service base station, so that the air interface time sequence of the service base station guard module can be matched with the air interface time sequence of the service base station under the first time sequence constraint condition; and determining a second time sequence constraint condition of a service terminal guard module according to the air interface time sequence of the current service base station, so that the air interface time sequence of the service terminal guard module can be matched with the air interface time sequence of the service terminal under the second time sequence constraint condition. The transceiving time sequence control method of the cooperative frequency switching network provided by the invention avoids the occurrence of service interruption during transceiving conversion of the TDD network while assisting in improving the interference resistance of the cellular network.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a method for controlling the transmission and reception timing of a coordinated frequency switching network, a device for controlling the transmission and reception timing of a coordinated frequency switching network, and a communication system. Background Art

[0002] Commercial cellular network technologies represented by 5G have significantly changed people's lifestyles and promoted rapid social progress with their excellent features such as large bandwidth, low latency, and ultra-large-scale networking. Commercial cellular networks all operate at specific operating frequencies, which are not allowed to be used by other wireless devices to prevent interference with communications. When cellular networks are applied to special fields, due to their lack of anti-interference capabilities, when encountering interference, it may cause communication degradation or even business interruption.

[0003] Commercial cellular networks are usually divided into two working modes: FDD (frequency division duplex) and TDD (time division duplex). In FDD networks, since uplink and downlink transmissions can be carried out simultaneously, there is no problem of transceiver timing conversion. In TDD networks, since uplink and downlink transmissions are carried out in time division, how to maintain strict transceiver conversion timing in the technical solution to avoid anti-interference in TDD networks to avoid cellular network service interruption has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The present invention provides a method for controlling the transmit and receive timing of a coordinated frequency switching network, a transmit and receive timing control device and a communication system of a coordinated frequency switching network, which solve the problem of cellular network service interruption caused by mismatch in transmit and receive timing while avoiding interference in the TDD network existing in the related art.

[0005] As a first aspect of the present invention, a method for controlling the transmission and reception timing of a coordinated frequency switching network is provided, wherein the method is applied to a communication system, wherein the communication system includes a service base station node and a service terminal node communicatively connected to the service base station node, the service base station node includes a service base station and a service base station guard module communicatively connected to the service base station, the service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal, the service base station is communicatively connected to the service terminal to form a service network, and the service base station guard module is communicatively connected to the service terminal guard module to form a guard network; the method for controlling the transmission and reception timing of the coordinated frequency switching network includes: Obtain the air interface timing of the current service base station; Determine a first timing constraint condition of a service base station guard module according to the air interface timing of the current service base station, so that the air interface timing of the service base station guard module can match the air interface timing of the service base station under the first timing constraint condition; Determine the second timing constraint condition of the service terminal guard module according to the air interface timing of the current service base station, so that the air interface timing of the service terminal guard module can match the air interface timing of the service terminal under the second timing constraint condition; Among them, the service base station guard module can provide a time reference for the service base station through the timing interface. The service terminal is synchronized with the service base station in the air interface, and the service terminal guard module is synchronized with the service base station guard module through the guard network.

[0006] Further, determining the first timing constraint condition of the service base station guard module according to the air interface timing of the current service base station includes: Determine that the service base station guard module is in the sending state of the service base station guard module when the air interface downlink moment of the service base station arrives according to the air interface timing of the current service base station, and the duration of the sending state of the service base station guard module is greater than or equal to the duration of the current air interface downlink of the service base station; Determine that the service base station guard module is in the receiving state of the service base station guard module when the air interface uplink moment of the service base station arrives according to the air interface timing of the current service base station, and the duration of the receiving state of the service base station guard module is greater than or equal to the duration of the current air interface uplink of the service base station.

[0007] Further, based on the boundary of the air interface configuration period of the service base station, When the service base station guard module is in the sending state of the service base station guard module, the service base station guard module changes to the receiving state of the service base station guard module after the duration of the sending state of the service base station guard module times out. The calculation formula for the duration of the sending state TX1 of the service base station guard module is: Duration of TX1 = Duration of current air interface downlink + Single downlink-to-uplink protection / 2; When the service base station guard module is in the receiving state of the service base station guard module, the service base station guard module changes to the sending state of the service base station guard module after the duration of the receiving state of the service base station guard module times out. The calculation formula for the duration of the receiving state RX1 of the service base station guard module is: Duration of RX1 = Duration of current air interface uplink + Single downlink-to-uplink protection / 2.

[0008] Further, the state corresponding to the downlink-to-uplink protection interval of the air interface of the service base station guard module and the service base station is set to the first flexible state, and the first flexible state includes a sending state and / or a receiving state.

[0009] Further, determining the second timing constraint condition of the service terminal guard module according to the air interface timing of the current service base station includes: Determine that the service terminal guard module is in the receiving state at the end of the air interface downlink path delay of the service terminal according to the air interface timing of the current service base station, and the duration of the receiving state of the service terminal guard module is greater than or equal to the duration of the current air interface downlink of the service terminal; Determine that the service terminal guard module is in the transmitting state at the moment when the time advance of the air interface uplink of the service terminal reaches according to the air interface timing of the current service base station, and the duration of the transmitting state of the service terminal guard module is greater than or equal to the duration of the current air interface uplink of the service terminal.

[0010] Further, based on the boundary of the air interface configuration period of the service base station, When the service terminal guard module is in the receiving state of the service terminal guard module, after the duration of the receiving state of the service terminal guard module times out, it turns into the transmitting state of the service terminal guard module. The calculation formula for the duration of the receiving state RX2 of the service terminal guard module is: Duration of RX2 = Duration of current air interface downlink + Single downlink to uplink protection / 2; When the service terminal guard module is in the transmitting state of the service terminal guard module, after the duration of the transmitting state of the service terminal guard module times out, it turns into the receiving state of the service terminal guard module. The calculation formula for the duration of the transmitting state TX2 of the service terminal guard module is: Duration of TX2 = Duration of current air interface uplink + Single downlink to uplink protection / 2.

[0011] Further, the states corresponding to the air interface downlink to uplink interval and the air interface uplink to downlink interval of the service terminal guard module and the service terminal are both set to the second flexible state, and the second flexible state includes the transmitting state and / or the receiving state; wherein the lengths of the air interface downlink to uplink interval and the air interface uplink to downlink interval are both greater than or equal to 0.

[0012] As another aspect of the present invention, there is provided a transceiver timing control device for a cooperative frequency switching network, which is applied to a communication system. The communication system includes a service base station node and a service terminal node communicatively connected to the service base station node. The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service base station is communicatively connected to the service terminal to form a service network, and the service base station guard module is communicatively connected to the service terminal guard module to form a guard network; the transceiver timing control device for the cooperative frequency switching network includes: An acquisition module for acquiring the air interface timing of the current service base station; A first determination module for determining a first timing constraint condition of the service base station guard module according to the air interface timing of the current service base station, so that the air interface timing of the service base station guard module can match the air interface timing of the service base station under the first timing constraint condition; A second determination module for determining a second timing constraint condition of the service terminal guard module according to the air interface timing of the current service base station, so that the air interface timing of the service terminal guard module can match the air interface timing of the service terminal under the second timing constraint condition; Wherein, the service base station guard module can provide a time reference for the service base station through a timing interface, the service terminal is air interface synchronized with the service base station, and the service terminal guard module is time synchronized with the service base station guard module through a guard network.

[0013] As another aspect of the present invention, there is provided a communication system, which includes: a service base station node and a service terminal node communicatively connected to the service base station node. The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service base station is communicatively connected to the service terminal to form a service network. The service base station guard module is communicatively connected to the service terminal guard module to form a guard network. Both the service base station guard module and the service terminal guard module include the transceiver timing control device of the collaborative frequency switching network described above.

[0014] Further, the service base station and the service base station guard module are communicatively connected through a radio frequency interface. The service base station guard module can frequency-convert the operating frequency of the service base station and emit it at the service air interface of the service base station guard module, and can also frequency-convert the air interface frequency received at the service air interface and send it to the service base station through the radio frequency interface. The service base station guard module can send a timing signal to the service base station; The service terminal and the service terminal guard module are communicatively connected through a radio frequency interface. The service terminal guard module can frequency-convert the operating frequency of the service terminal and emit it at the service air interface of the service terminal guard module, and can also frequency-convert the air interface frequency received at the service air interface and send it to the service terminal through the radio frequency interface. The air interface of the service terminal is synchronized with the air interface of the service base station, and the time of the service terminal guard module is synchronized with the guard network where it is located.

[0015] The method for controlling the transceiver timing sequence of the collaborative frequency switching network provided by the present invention respectively sets a first timing constraint condition for the service base station guard module so that the air interface timing of the service base station guard module matches the air interface timing of the service base station, and sets a second timing constraint condition for the service terminal guard module so that the air interface timing of the service terminal guard module matches the air interface timing of the service terminal. This not only improves the anti-interference ability of the cellular network, but also ensures the normal transceiver of the air interface service in the TDD service network, realizing the support for the normal operation of the air interface in the TDD service network. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention.

[0017] Figure 1 It is a structural block diagram of the communication system provided by the present invention.

[0018] Figure 2 It is a structural block diagram of the service base station node provided by the present invention.

[0019] Figure 3 It is a structural block diagram of the service terminal node provided by the present invention.

[0020] Figure 4 It is a structural block diagram of the transceiver timing control device of the collaborative frequency switching network provided by the present invention.

[0021] Figure 5 It is a schematic diagram of the timing relationship of the air interface radio frames of the service base station and the service terminal stipulated by the air interface protocol of the service network provided by the present invention.

[0022] Figure 6 It is a flowchart of the method for controlling the transceiver timing sequence of the collaborative frequency switching network provided by the present invention.

[0023] Figure 7 It is a schematic diagram of the timing sequence of an implementation manner of the service base station guard module and the service terminal guard module under the constraint conditions provided by the present invention.

[0024] Figure 8 It is a schematic diagram of the timing sequence of another implementation manner of the service base station guard module and the service terminal guard module under the constraint conditions provided by the present invention.

[0025] Figure 9 It is a schematic diagram of the uplink and downlink slot ratio and flexible slot configuration of TDD-5G provided by the present invention.

[0026] Figure 10 It is a schematic diagram of the air interface radio frame timing sequence on the service base station side of TDD-5G provided by the present invention.

[0027] Figure 11 This is a timing diagram of the transceiver switching for the service base station guard module and the service terminal guard module of TDD-5G provided by the present invention.

[0028] Figure 12 This is a timing diagram of the service base station guard module and the service terminal guard module of TDD-5G provided by the present invention. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] Currently, when the cellular network is applied to commercial and other fields, due to its lack of anti-interference ability, when encountering interference, it may cause communication degradation or even service interruption.

[0033] Based on this, in the embodiments of the present invention, a communication system 10 is provided, as Figure 1As shown in the figure, it includes a service base station node 100 and a service terminal node 200 communicatively connected to the service base station node 100. The service base station node 100 includes a service base station 110 and a service base station guard module 120 communicatively connected to the service base station 110. The service terminal node 200 includes a service terminal 210 and a service terminal guard module 220 communicatively connected to the service terminal 210. The communication connection between the service base station 110 and the service terminal 210 can form a service network, and the communication connection between the service base station guard module 120 and the service terminal guard module 220 can form a guard network.

[0034] In the embodiments of the present invention, the service base station is mainly the base station of the service network, such as a 5G base station; the service base station guard module is mainly used to integrate with the service base station, support interconnection and interoperability with the service terminal guard module and other service base station guard modules, and form a guard network.

[0035] The service terminal is mainly the terminal of the service network, such as a 5G terminal; the service terminal guard module is mainly integrated with the service terminal, supports interconnection and interoperability with the service base station guard module and other service terminal guard modules, and forms a guard network.

[0036] In addition, the service network is mainly a wireless communication network composed of service base stations and service terminals, used for service bearing, such as 4G cellular network, 5G cellular network, etc.; the guard network is mainly composed of service base station guard modules and service terminal guard modules, and is mainly used to provide the guard ability of cooperative frequency switching for service base stations or service terminals to avoid interference.

[0037] It should be understood that in the embodiments of the present invention, the service terminal deploys a service terminal guard module to build a guard network with the service base station guard module deployed in the service base station. The service terminal guard module receives a network cooperative frequency switching instruction from the service base station guard module. This instruction notifies the occurrence time and target frequency point of the frequency change of the service terminal node. The service terminal guard module assists the service terminal to directly switch the actual working frequency of its own hardware platform to the target frequency point when the occurrence time of the frequency change arrives, ensuring that the service terminal and the service base station change frequencies synchronously, bypassing the standard 3GPP protocol processing process (that is, the frequency switching process keeps the working parameters and protocol process of the communication system unchanged). Through this strategy, the cellular network can sense the air interface spectrum situation in real time and avoid interference.

[0038] It should be noted that when the terminal guard module is not deployed on the service terminal, the frequency of the service terminal needs to implement initial frequency determination and frequency switching through the standard 3GPP protocol. However, due to the problem of poor anti-interference ability in the 3GPP protocol itself, the communication system provided by the present invention deploys a service terminal guard module on the service terminal and a service base station guard module on the service base station. The service terminal guard module and the service base station guard module can assist the service base station and the service terminal to synchronously change the working frequency to achieve network collaborative frequency conversion. At the same time, the service terminal guard module deployed on the service terminal side interacts with different service base station guard modules and assists the service terminal to select the best cell for handover based on the communication measurement results, so as to ensure that the entire communication network has a strong anti-interference ability and realizes the fast handover of the terminal device when moving at the cell edge, and avoids service interruption of the terminal device during cell handover.

[0039] In the embodiment of the present invention, as Figure 2 shown, the service base station 110 is communicatively connected to the service base station guard module 120 through a radio frequency interface. The service base station guard module 120 can convert the working frequency of the service base station 110 and send it out at the service air interface of the service base station guard module 120, and can also convert the air interface frequency received at the service air interface and send it to the service base station 110 through the radio frequency interface; the service base station guard module 120 can send a timing signal to the service base station 110, and the time of the service base station guard module 120 is synchronized with the time of the guard network where it is located.

[0040] Specifically, the service base station node is composed of a service base station and a service base station guard module. The service base station 110 is interconnected with the service radio frequency interface of the service base station guard module 120 through a radio frequency interface. The transmitted signal (working frequency) of the service base station is converted by the auxiliary frequency switching unit of the service base station guard module 120 and then sent out at the service air interface of the service base station guard module 120 (air interface frequency); the signal (air interface frequency) received at the service air interface of the service base station guard module is converted by the auxiliary frequency switching unit of the service base station guard module 120 (working frequency) and then sent to the radio frequency interface of the service base station through the service radio frequency interface. The whole process is transparent to the service base station. The working frequency of the service base station is determined by the device capabilities and configurations, and the air interface frequency of the service base station node is determined by the control of the service base station guard module.

[0041] In the embodiment of the present invention, the time synchronization signal of the service base station comes from the service base station guard module, and the guard network formed by the communication unit between different guard modules can achieve guard network-level time synchronization. The service base station guard module can also achieve time synchronization by receiving an external clock signal (such as an external Beidou, 1588, etc. external synchronization source) through an external synchronization interface.

[0042] like Figure 3 As shown, the service terminal 210 and the service terminal guard module 220 are communicatively connected via a radio frequency interface. The service terminal guard module 220 can frequency-convert the working frequency of the service terminal 210 and send it out at the service air interface of the service terminal guard module 220, and can also frequency-convert the air interface frequency received at the service air interface and send it to the service terminal 210 through the radio frequency interface; the time of the service terminal 210 is synchronized with the service base station 110, and the time of the service terminal guard module 220 is synchronized with the guard network in which it is located.

[0043] Specifically, the service terminal node is composed of a service terminal and a service terminal guard module. The service terminal is interconnected with the service RF interface of the service terminal guard module through the RF interface. The transmission signal (working frequency) of the service terminal is frequency-converted by the auxiliary frequency switching unit and then sent out at the service air interface of the service terminal guard module (air interface frequency); the signal (air interface frequency) received by the service air interface of the service terminal guard module is frequency-converted by the auxiliary frequency switching unit (working frequency) and then sent to the RF interface of the service terminal through the service RF interface. The whole process is transparent to the service terminal. The working frequency of the service terminal is determined by the service terminal protocol stack, and the air interface frequency of the service terminal node is determined by the service terminal guard module according to the instructions of the service base station guard module, and is consistent with the service base station node to which it belongs.

[0044] In the embodiment of the present invention, the service terminal keeps synchronization with the service base station, and there is no need for the service terminal guard module to provide time synchronization to the service terminal; the service terminal guard module keeps time synchronization with the guard network formed by the communication unit through the service base station guard module to which it belongs.

[0045] Therefore, in an embodiment of the present invention, the service base station guard module is used as the time reference, the service base station maintains time synchronization with the service base station guard module through the timing interface; the service terminal maintains air interface synchronization with the service base station through the standard air interface protocol; the service terminal guard module maintains time synchronization with the service base station guard module through the guard network; therefore, the entire communication system can form a unified timing reference.

[0046] For TDD (time division duplex) network, since uplink and downlink transmission are performed in time division, it is necessary to maintain strict transceiver conversion timing between the service base station guard module and the service base station, and between the service terminal guard module and the service terminal, otherwise the cellular network service will be interrupted. Therefore, in the embodiment of the present invention, the service base station guard module and the service terminal guard module both include the transceiver timing control device of the coordinated frequency switching network described below.

[0047] The transceiver timing control device of the collaborative frequency switching network of the present invention can provide synchronous transceiver conversion and network-level collaborative frequency switching for cellular network base stations and terminals, and can achieve rapid switching of the air interface frequency at the network level without affecting the cellular network service process, avoiding interference. In addition, for the TDD network, it can ensure that its transceiver timing matches that of the cellular network base station and terminal, realizing network-level collaborative frequency switching of the cellular network without affecting the normal transmission of services.

[0048] As another embodiment of the present invention, a transceiver timing control device for a collaborative frequency switching network is provided, which is applied to the communication system described above, such as Figure 4 shown, the transceiver timing control device 300 of the collaborative frequency switching network includes: An acquisition module 310, configured to acquire the air interface timing of the current serving base station; A first determination module 320, configured to determine a first timing constraint condition for the serving base station guard module according to the air interface timing of the current serving base station, so that the air interface timing of the serving base station guard module can match the air interface timing of the serving base station under the first timing constraint condition; A second determination module 330, configured to determine a second timing constraint condition for the serving terminal guard module according to the air interface timing of the current serving base station, so that the air interface timing of the serving terminal guard module can match the air interface timing of the serving terminal under the second timing constraint condition; Wherein, the serving base station guard module can provide a time reference for the serving base station through a timing interface, the serving terminal is synchronized with the serving base station in the air interface, and the serving terminal guard module is synchronized with the serving base station guard module through a guard network.

[0049] For the collaborative frequency switching network with the TDD mode as the service network, the transceiver timing control device provided by the present invention enables the serving base station guard module and the serving terminal guard module to perform transceiver timing operations, which can support the normal operation of the air interface of the TDD service network; and it is transparent to the serving base station and the serving terminal, and there is no need to modify the standard protocol stack of the service network.

[0050] Such as Figure 5 shown, it is the timing relationship of the air interface radio frames of the serving base station and the serving terminal specified by the air interface protocol of the service network. Figure 5 A schematic diagram of a complete air interface configuration period is given, and the air interface timing is the continuous repetition of the configuration period. For example, 4G repeats with the air interface radio frame as the period; 5G repeats with the time slot configuration period.

[0051] Taking the air interface timing of the service base station as a reference, in the downlink direction, the duration by which the boundary of the air interface radio frame received by the service terminal lags behind the transmission time of the service base station is the path delay; in the uplink direction, to ensure that the service base station receives the uplink radio frames sent by each service terminal at the boundary of the air interface uplink frame, it is required that each service terminal sends ahead of the boundary of the air interface uplink frame of the service base station (i.e., Figure 5 the time advance amount in

[0052] . According to the distance of different service terminals from the base station, the time advance amount varies, and this time advance amount is measured by the service base station and then sent to the service terminal. Figure 5 Based on and the above analysis, from the perspective of the air interface protocol of the service network, the service base station only inserts "downlink to uplink protection" when the air interface switches from downlink to uplink, and no protection is required when the air interface switches from uplink to downlink; there is a "downlink to uplink" interval on the service terminal side when the air interface switches from downlink to uplink, and the length of this interval is greater than or equal to 0, which can be expressed by the following formula: Length of the "downlink to uplink" interval of the service terminal = "downlink to uplink protection" on the service base station side - path transmission delay - time advance amount; There is an "uplink to downlink" interval on the service terminal side when the air interface switches from uplink to downlink, and the length of this interval is greater than or equal to 0, which can be expressed by the following formula:

[0053] Length of the "uplink to downlink" interval of the service terminal = time advance amount + path transmission delay.

[0054] Therefore, from the above analysis, it can be seen that as long as the air interface timing of the service base station guard module matches the air interface timing of the service base station, and the air interface timing of the service terminal guard module matches the air interface timing of the service terminal, the normal transceiver of the air interface service in the service network can be ensured. Figure 6 As another embodiment of the present invention, a method for controlling the transceiver timing of a coordinated frequency switching network is provided. Figure 6 It is a flowchart of the method for controlling the transceiver timing of the coordinated frequency switching network provided by the embodiment of the present invention, as shown. The method for controlling the transceiver timing of the coordinated frequency switching network includes: S100. Obtain the air interface timing of the current service base station; Figure 7 In the embodiment of the present invention, taking the air interface timing of the service base station as a reference, it is necessary to obtain the air interface timing of the service base station. Specifically as

[0055] shown. In an embodiment of the present invention, the first timing constraint condition enables the air interface timing of the service base station guard module to match the air interface timing of the service base station.

[0056] S300. Determine a second timing constraint condition for the service terminal guard module according to the air interface timing of the current service base station, so that the air interface timing of the service terminal guard module can match the air interface timing of the service terminal under the second timing constraint condition; In an embodiment of the present invention, the second timing constraint condition enables the air interface timing of the service terminal guard module to match the air interface timing of the service terminal.

[0057] Wherein, the service base station guard module can provide a time reference for the service base station through a timing interface, the service terminal is air interface synchronized with the service base station, and the service terminal guard module is time synchronized with the service base station guard module through a guard network.

[0058] The transceiver timing control method for the collaborative frequency switching network provided by the present invention, by respectively setting a first timing constraint condition for the service base station guard module to make the air interface timing of the service base station guard module match the air interface timing of the service base station, and setting a second timing constraint condition for the service terminal guard module to make the air interface timing of the service terminal guard module match the air interface timing of the service terminal, not only improves the anti-interference ability of the cellular network, but also can ensure the normal transceiver of the air interface service in the TDD service network, and realizes the support for the normal operation of the air interface in the TDD service network.

[0059] Specifically, as Figure 7 shown, determining the first timing constraint condition for the service base station guard module according to the air interface timing of the current service base station includes: Determine that the service base station guard module is in the service base station guard module transmission state when the air interface downlink moment of the service base station arrives according to the air interface timing of the current service base station, and the duration of the service base station guard module transmission state is greater than or equal to the duration of the current air interface downlink of the service base station; It should be understood that in an embodiment of the present invention, according to the configuration, when the air interface downlink moment arrives, the service base station guard module must be in the transmission state (TX), and the duration ≥ the duration of the current air interface downlink.

[0060] Determine that the service base station guard module is in the service base station guard module reception state when the air interface uplink moment of the service base station arrives according to the air interface timing of the current service base station, and the duration of the service base station guard module reception state is greater than or equal to the duration of the current air interface uplink of the service base station.

[0061] In an embodiment of the present invention, according to the configuration, when the uplink time of the air interface arrives, the service base station guard module must be in the receiving state (RX), and the duration ≥ the duration of the current air interface uplink.

[0062] It should be noted that the state corresponding to the downlink-to-uplink protection interval of the air interface of the service base station guard module is set to the first flexible state, and the first flexible state includes the sending state and / or the receiving state.

[0063] In an embodiment of the present invention, there is no requirement for the state of the service base station guard module at the downlink-to-uplink protection moment. On the premise that the service base station guard module and the service terminal guard module are synchronized, the downlink-to-uplink protection moment corresponding to the service base station guard module can be in the sending state, or in the receiving state, or both the sending state and the receiving state coexist. When both the sending state and the receiving state coexist, the respective proportions of the sending state and the receiving state can be configured as needed, and can be specifically set as needed.

[0064] Further specifically, in an embodiment of the present invention, in order to avoid air interface measurement errors caused by path delay or time advance changing with the change of the distance between the service terminal node and the service base station node, taking the air interface configuration period boundary of the service base station as a benchmark, that is, in order to be able to tolerate measurement errors and the position change of the service terminal node to the greatest extent, as Figure 8 shown, taking the air interface configuration period boundary of the service base station as a benchmark, the timing conversion of the service base station guard module can be specifically constrained as: When the service base station guard module is in the sending state of the service base station guard module, the service base station guard module changes to the receiving state of the service base station guard module after the duration of the sending state of the service base station guard module times out. The calculation formula for the duration of the sending state TX1 of the service base station guard module is: TX1 duration = the duration of the current air interface downlink + single downlink-to-uplink protection / 2; When the service base station guard module is in the receiving state of the service base station guard module, the service base station guard module changes to the sending state of the service base station guard module after the duration of the receiving state of the service base station guard module times out. The calculation formula for the duration of the receiving state RX1 of the service base station guard module is: RX1 duration = the duration of the current air interface uplink + single downlink-to-uplink protection / 2.

[0065] By the above constraints on the calculation formula for the duration of the sending state of the service base station guard module and the calculation formula for the duration of the receiving state of the service base station guard module, the accuracy of engineering implementation can be improved.

[0066] In the embodiments of the present invention, specifically, as Figure 7 shown, determining the second timing constraint condition of the service terminal guard module according to the air interface timing of the current service base station includes: Determining that the service terminal guard module is in the receiving state at the end moment of the air interface downlink path delay of the service terminal according to the air interface timing of the current service base station, and the duration of the receiving state of the service terminal guard module is greater than or equal to the duration of the current air interface downlink of the service terminal; Determining that the service terminal guard module is in the sending state at the moment when the air interface uplink timing advance of the service terminal arrives according to the air interface timing of the current service base station, and the duration of the sending state of the service terminal guard module is greater than or equal to the duration of the current air interface uplink of the service terminal.

[0067] It should be understood that in the embodiments of the present invention, based on the service base station, the second timing constraint condition of the service terminal guard module is specifically: The service terminal guard module must be in the receiving state (RX) after the "path delay" of the air interface downlink, and the duration ≥ the duration of the current air interface downlink; The service terminal guard module must be in the sending state (TX) before the "timing advance" of the air interface uplink, and the duration ≥ the duration of the current air interface uplink; In the embodiments of the present invention, the states corresponding to the air interface downlink to uplink interval and the air interface uplink to downlink interval of the service terminal guard module and the service terminal are both set to the second flexible state, and the second flexible state includes the sending state and / or the receiving state; wherein the lengths of the air interface downlink to uplink interval and the air interface uplink to downlink interval are both greater than or equal to 0.

[0068] It should be understood that there are no requirements for the state of the service terminal guard module at the "downlink to uplink" and "uplink to downlink" moments of the air interface. On the premise that the service base station guard module and the service terminal guard module are synchronized, the states of the service terminal guard module corresponding to the air interface downlink to uplink and uplink to downlink moments are not limited, and can be the sending state, the receiving state, or the coexistence of the sending state and the receiving state. When the sending state and the receiving state coexist, the respective proportions of the sending state and the receiving state can be configured as needed, and can be specifically set as needed.

[0069] In the embodiments of the present invention, in order to avoid the air interface measurement error caused by the change of the path delay or the timing advance with the change of the distance between the service terminal node and the service base station node, based on the air interface configuration period boundary of the service base station, that is, in order to be able to tolerate the measurement error and the position change of the service terminal node to the greatest extent, as Figure 8 shown, based on the air interface configuration period boundary of the service base station, When the service terminal guard module is in the service terminal guard module receiving state, the service terminal guard module switches to the service terminal guard module sending state after the duration of the service terminal guard module receiving state times out. The calculation formula for the duration of the service terminal guard module receiving state RX2 is as follows: Duration of RX2 = Duration of current downlink over-the-air + Single downlink to uplink protection / 2; When the service terminal guard module is in the service terminal guard module sending state, the service terminal guard module switches to the service terminal guard module receiving state after the duration of the service terminal guard module sending state times out. The calculation formula for the duration of the service terminal guard module sending state TX2 is as follows: Duration of TX2 = Duration of current uplink over-the-air + Single downlink to uplink protection / 2.

[0070] By restricting the calculation formulas for the duration of the service terminal guard module sending state and the duration of the service terminal guard module receiving state as described above, the accuracy of engineering implementation can be improved.

[0071] Next, taking a specific 5G cellular network as an example, the specific implementation process of the transceiver timing control method for the cooperative frequency switching network of the present invention will be described in detail.

[0072] Assume that the over-the-air of the TDD-5G cell uses a normal CP (Cyclic Prefix), the subcarrier spacing is 30 kHz, the slot configuration period is 5 ms, and the uplink-downlink slot ratio and flexible slot configuration are as Figure 9 shown: Uplink-downlink slot configuration (7 downlink slots, 2 uplink slots, 1 flexible slot), Flexible slot configuration (6 downlink symbols, 4 uplink symbols, 4 protection symbols).

[0073] Since the time reference of the service base station comes from the service base station guard module (through the timing interface), the service terminal is synchronized with the service base station over the air, and the service terminal guard module and the service base station guard module are synchronized in time through the guard network. Therefore, this network has a unified time reference. The over-the-air radio frame timing on the service base station side is as Figure 10 shown, where G is used for downlink to uplink protection.

[0074] Based on this, the transceiver switching timing of the service base station guard module and the service terminal guard module is as Figure 11 shown. Looking at it based on the time of the service base station guard module, the transceiver switching timing of the service base station guard module and the service terminal guard module is reversed.

[0075] The service base station guard module provides time synchronization for the service base station through a wired time synchronization interface, so the time synchronization accuracy between the two is relatively high. The service terminal and the service terminal guard module are synchronized with the service base station and the service base station guard module through the air interface, so the synchronization accuracy is relatively low. By increasing the protection interval from downlink to uplink, the decrease in synchronization accuracy can be partially tolerated.

[0076] As Figure 12 shown, if the time of the service terminal guard module is slightly ahead of that of the service base station guard module: 1) Downlink to uplink (the handover point is advanced). By increasing the duration of "downlink to uplink protection", the state of the service terminal guard module in receiving RX can be extended (covering "completion of receiving downlink information through the air interface" in time), thus avoiding the risk of incomplete reception of downlink information through the air interface by the service terminal. For the transmission of uplink information through the air interface by the service terminal, since the service terminal guard module has switched to the transmission TX state in advance, it is not affected. 2) Uplink to downlink (the handover point is advanced). Since the service terminal will send information through the air interface in advance, as long as the time advance of the service terminal guard module is less than or equal to the moment of "completion of sending uplink information through the air interface", the uplink transmission of the service terminal will not be affected. For downlink reception, since the state of the service terminal guard module has switched to RX in advance, there is no risk of non-reception.

[0077] If the time of the service terminal guard module is slightly behind that of the service base station guard module: 1) Downlink to uplink (the handover point is delayed). Since the state of the service terminal guard module switching from receiving RX to transmitting TX is delayed, it will not affect the complete reception of downlink information through the air interface. However, it may cause the service terminal to have switched to the transmission TX state, but the service terminal guard module is still in the receiving RX state. By increasing the duration of "downlink to uplink protection", the state of the service terminal guard module in TX can be extended (covering "start of sending uplink information through the air interface" in time), thus avoiding the risk of incomplete transmission of the first half of the uplink information through the air interface by the service terminal. 2) Uplink to downlink (the handover point is delayed). Since the state of the service terminal guard module is delayed in switching to receiving RX, there is no risk of incomplete transmission of the second half of the uplink information through the air interface. Also, since the downlink radio frame through the air interface needs to pass through the path delay to reach the service terminal, as long as the time lag of the service terminal guard module is less than the path delay, the service terminal can correctly receive the downlink information through the air interface.

[0078] Therefore, for the transceiver timing control method of the collaborative frequency switching network provided by the present invention, for a collaborative frequency switching network with a TDD-mode service network, by imposing transceiver timing constraints on the service base station guard module, it can ensure the matching of the transceiver conversion timing between the service base station guard module and the service base station. Imposing transceiver timing constraints on the service terminal guard module can ensure the matching of the transceiver conversion timing between the service terminal guard module and the service terminal, realizing cellular network-level collaborative frequency switching without affecting the normal transmission of services. Additionally, it can support the normal operation of the air interface of the TDD service network, and the transceiver timing control method of this collaborative frequency switching network is transparent to the service base station and the service terminal, without the need to modify the standard protocol stack of the service network.

[0079] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A method for controlling the transceiver timing sequence of a collaborative frequency switching network, characterized in that Applied to a communication system, the communication system includes a service base station node and a service terminal node communicatively connected to the service base station node. The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service base station is communicatively connected to the service terminal to form a service network, and the service base station guard module is communicatively connected to the service terminal guard module to form a guard network; The transceiver timing control method of the cooperative frequency switching network includes: Obtain the air interface timing of the current service base station; Determine the first timing constraint condition of the service base station guard module according to the air interface timing of the current service base station, so that the air interface timing of the service base station guard module can match the air interface timing of the service base station under the first timing constraint condition; Determine the second timing constraint condition of the service terminal guard module according to the air interface timing of the current service base station, so that the air interface timing of the service terminal guard module can match the air interface timing of the service terminal under the second timing constraint condition; Wherein, the service base station guard module can provide a time reference for the service base station through a timing interface. The service terminal is air interface synchronized with the service base station, and the service terminal guard module is time synchronized with the service base station guard module through the guard network.

2. The transceiver timing control method for the collaborative frequency switching network according to claim 1, wherein Determining the first timing constraint condition of the service base station guard module according to the air interface timing of the current service base station includes: Determine that the service base station guard module is in the service base station guard module transmission state when the air interface downlink moment of the service base station arrives according to the air interface timing of the current service base station, and the duration of the service base station guard module transmission state is greater than or equal to the duration of the current air interface downlink of the service base station; Determine that the service base station guard module is in the service base station guard module reception state when the air interface uplink moment of the service base station arrives according to the air interface timing of the current service base station, and the duration of the service base station guard module reception state is greater than or equal to the duration of the current air interface uplink of the service base station.

3. The transceiver timing control method for the collaborative frequency switching network according to claim 2, characterized in that, Based on the boundary of the air interface configuration period of the service base station, When the service base station guard module is in the service base station guard module transmission state, the service base station guard module switches to the service base station guard module reception state after the duration of the service base station guard module transmission state times out. The calculation formula for the duration of the service base station guard module transmission state TX1 is: TX1 duration = current air interface downlink duration + single downlink to uplink protection / 2; When the service base station guard module is in the service base station guard module reception state, the service base station guard module switches to the service base station guard module transmission state after the duration of the service base station guard module reception state times out. The calculation formula for the duration of the service base station guard module reception state RX1 is: RX1 duration = current air interface uplink duration + single downlink to uplink protection / 2.

4. The method for controlling the transceiver timing sequence of the collaborative frequency switching network according to claim 2, characterized in that The state corresponding to the downlink-to-uplink protection interval of the air interface of the service base station for the service base station guard module is set to a first flexible state, and the first flexible state includes a transmission state and / or a reception state.

5. The method for controlling the transceiver timing sequence of the cooperative frequency switching network according to claim 1, characterized in that, Determine the second timing constraint condition of the service terminal guard module according to the air interface timing of the current service base station, including: Determine that the service terminal guard module is in the reception state of the service terminal guard module at the end of the downlink path delay of the air interface of the service terminal according to the air interface timing of the current service base station, and the duration of the reception state of the service terminal guard module is greater than or equal to the duration of the current downlink of the air interface of the service terminal; Determine that the service terminal guard module is in the transmission state of the service terminal guard module at the moment when the uplink time advance of the air interface of the service terminal arrives according to the air interface timing of the current service base station, and the duration of the transmission state of the service terminal guard module is greater than or equal to the duration of the current uplink of the air interface of the service terminal.

6. The method for controlling the transceiver timing sequence of the cooperative frequency switching network according to claim 5, characterized in that, Based on the boundary of the air interface configuration period of the service base station, When the service terminal guard module is in the reception state of the service terminal guard module, after the duration of the reception state of the service terminal guard module times out, it switches to the transmission state of the service terminal guard module. The calculation formula for the duration of the reception state RX2 of the service terminal guard module is: Duration of RX2 = Duration of current downlink of air interface + Single downlink-to-uplink protection / 2; When the service terminal guard module is in the transmission state of the service terminal guard module, after the duration of the transmission state of the service terminal guard module times out, it switches to the reception state of the service terminal guard module. The calculation formula for the duration of the transmission state TX2 of the service terminal guard module is: Duration of TX2 = Duration of current uplink of air interface + Single downlink-to-uplink protection / 2.

7. The method for controlling the transceiver timing sequence of the cooperative frequency switching network according to claim 5, characterized in that, The states corresponding to the downlink-to-uplink interval and the uplink-to-downlink interval of the air interface of the service terminal for the service terminal guard module are both set to a second flexible state, and the second flexible state includes a transmission state and / or a reception state; where the lengths of the downlink-to-uplink interval and the uplink-to-downlink interval are both greater than or equal to 0.

8. A transceiver timing control device for a cooperative frequency switching network, characterized in that Applied to a communication system, the communication system includes a service base station node and a service terminal node communicatively connected to the service base station node. The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service base station is communicatively connected to the service terminal to form a service network, and the service base station guard module is communicatively connected to the service terminal guard module to form a guard network; The transceiver timing control device of the cooperative frequency switching network includes: An acquisition module, configured to acquire the air interface timing of the current service base station; A first determination module, configured to determine the first timing constraint condition of the service base station guard module according to the air interface timing of the current service base station, so that the air interface timing of the service base station guard module can match the air interface timing of the service base station under the first timing constraint condition; A second determination module, configured to determine a second timing constraint condition of the service terminal guard module according to the air interface timing of the current service base station, so that the air interface timing of the service terminal guard module can match the air interface timing of the service terminal under the second timing constraint condition; Wherein, the service base station guard module can provide a time reference for the service base station through a timing interface, the service terminal is synchronized with the service base station in the air interface, and the service terminal guard module is synchronized with the service base station guard module through a guard network.

9. A communication system, characterized in that, It includes: A service base station node and a service terminal node communicatively connected to the service base station node. The service base station node includes a service base station and a service base station guard module communicatively connected to the service base station. The service terminal node includes a service terminal and a service terminal guard module communicatively connected to the service terminal. The service base station is communicatively connected to the service terminal to form a service network. The service base station guard module is communicatively connected to the service terminal guard module to form a guard network. Both the service base station guard module and the service terminal guard module include a transceiver timing control device of the cooperative frequency switching network described in claim 8.

10. The communication system according to claim 9, wherein The service base station and the service base station guard module are communicatively connected through a radio frequency interface. The service base station guard module can frequency-convert the operating frequency of the service base station and send it out at the service air interface of the service base station guard module, and can also frequency-convert the air interface frequency received at the service air interface and send it to the service base station through the radio frequency interface; the service base station guard module can send a timing signal to the service base station, and the time of the service base station guard module is synchronized with the guard network where it is located; The service terminal and the service terminal guard module are communicatively connected through a radio frequency interface. The service terminal guard module can frequency-convert the operating frequency of the service terminal and send it out at the service air interface of the service terminal guard module, and can also frequency-convert the air interface frequency received at the service air interface and send it to the service terminal through the radio frequency interface; the air interface of the service terminal is synchronized with the air interface of the service base station, and the time of the service terminal guard module is synchronized with the guard network where it is located.

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