CN110167089B - Network equipment, wireless communication system and channel switching method - Google Patents
Network equipment, wireless communication system and channel switching method Download PDFInfo
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- CN110167089B CN110167089B CN201910530564.9A CN201910530564A CN110167089B CN 110167089 B CN110167089 B CN 110167089B CN 201910530564 A CN201910530564 A CN 201910530564A CN 110167089 B CN110167089 B CN 110167089B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Abstract
The invention discloses a network device, a wireless communication system and a channel switching method. The network equipment comprises a synchronous signal sending module, a public broadcast signal sending module and a channel control module; the network equipment sends a synchronous downlink signal and a time slot indicating signal, and aligns different channel time slots; the terminal equipment receives the synchronous downlink signal, determines the starting point and the ending point of the time slot, locks the time slot number according to the time slot indicating signal and completes the switching of different channels. The technical scheme of the invention does not need to realign the time slot through the synchronous pattern SYNC when switching the channel, and does not need to lock the time slot indication information of the public broadcast channel CACH on the needed time slot, thereby shortening the access time of voice or other services.
Description
Technical Field
The present invention relates to the field of wireless network communication technologies, and in particular, to a network device, a wireless communication system, and a channel switching method.
Background
In a DMR (Digital Mobile Radio) or PDT (Public Digital Trunking) communication system, time is divided into 2 slots, each slot has a time number of 30ms, the number of the slot is incremented from 1 to 2 and then continuously circulates from 1, a terminal or a base station selects one of the slots to communicate, and the slots do not interfere with each other, thereby improving the frequency utilization rate. Time slots are not aligned between channels of different base stations or between channels of the same base station, and a terminal needs to realign the time slots through SYNC (Synchronization pattern) and lock the time slots on the required time slots through time slot indication information of CACH (Common Announcement Channel) when channels are switched, which may take 100ms to 600ms, which increases communication access time of the terminal, resulting in a longer access time of voice or other services of the terminal.
Disclosure of Invention
The application provides a network device, a wireless communication system and a channel switching method, which solve the problem that the access time of voice or other services of a terminal is long due to long communication access time of the terminal.
The embodiment of the application provides a network device, which comprises a synchronous signal sending module, a public broadcast signal sending module and a channel control module.
The synchronous signal sending module is used for sending a synchronous downlink signal; the synchronous downlink signal is used for determining a starting point and/or an end point of a time slot.
The public broadcast signal sending module is used for sending a time slot indicating signal through a public broadcast channel CACH; the time slot indication signal comprises time slot information used for locking the time slot number.
And the channel control module is used for aligning the first channel with the second channel time slot.
Preferably, the first channel and the second channel are transmitted by the same network device.
Preferably, an absolute time is adopted between the first channel and the second channel as a time slot alignment reference time; the time slot is aligned with the reference time and used for determining the starting point and/or the end point of the time slot.
Preferably, the time slot alignment reference time is set to be a GPS time or a beidou satellite navigation system time between the first channel and the second channel.
Preferably, the first channel is sent by a first network device, and the second channel is sent by a second network device.
Preferably, a time of any one of the first channel and the second channel is used as the timeslot alignment reference time.
Preferably, the first channel and/or the second channel are/is configured by time slot configuration information transmitted through a general purpose input output port GPIO of the master network device; the slot configuration information may be high and/or low.
The invention also provides a wireless communication system, which comprises network equipment and terminal equipment;
the network equipment comprises a synchronous signal sending module, a public broadcast signal sending module and a channel control module; the synchronous signal sending module is used for the network equipment to send a synchronous downlink signal; the public broadcast signal sending module is used for sending a time slot indicating signal through a public broadcast channel CACH; the channel control module is used for aligning a first channel of the network equipment with a second channel time slot, and/or aligning the first channel sent by the first network equipment with the second channel time slot sent by the second network equipment;
the terminal equipment comprises a synchronous signal receiving module, a time slot indicating signal receiving module and a channel switching module; the synchronous signal receiving module is used for receiving a synchronous downlink signal sent by the network equipment and determining a starting point and an ending point of a time slot; the time slot indication signal receiving module is used for the terminal equipment to receive the time slot indication signal sent by the common broadcast channel CACH and lock the time slot number; the channel switching module is used for controlling the terminal equipment to be switched from a first channel to a second channel.
Preferably, the terminal device is one of a mobile terminal, a mobile phone, an on-board station, and a handheld interphone.
The invention also provides a channel switching method of the wireless communication system, which comprises the following steps:
aligning the time slots of the network equipment channels;
the method comprises the steps that terminal equipment receives a synchronous downlink signal sent by network equipment, wherein the synchronous downlink signal is used for determining a starting point and/or an end point of a time slot;
the terminal equipment locks a time slot number according to a time slot indication signal of a common broadcast channel CACH;
and the communication of the terminal equipment is switched from the first channel to the second channel.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the invention provides a channel switching method for shortening the access time of terminal voice or other services, which does not need to realign time slots through a synchronous pattern SYNC when switching channels, and does not need to lock the time slots on the required time slots through the time slot indication information of a common broadcast channel CACH, thereby shortening the access time of the voice or other services.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a network device architecture;
FIG. 2 is a diagram illustrating a method for switching channels between channels of the same network device;
FIG. 3 is a diagram illustrating a method for switching channels between different network devices;
FIG. 4 is a diagram of a wireless communication system;
fig. 5 is a flow chart of a channel switching method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention aligns the time slots of the current communication channel and the target communication channel to be switched, and then carries out the channel switching.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a network device, wherein the network device 1 includes a synchronization signal transmitting module 11, a common broadcast signal transmitting module 12 and a channel control module 13.
A synchronous signal sending module 11, configured to send a synchronous downlink signal; the network equipment sends a synchronous downlink signal to the terminal equipment, the synchronous downlink signal is provided with a synchronous pattern, and the terminal equipment receives the synchronous downlink signal which is sent by the network equipment and is provided with the synchronous pattern; the synchronous downlink signal is used for determining a starting point and/or an ending point of a time slot, and the terminal equipment determines the starting point and/or the ending point of the time slot through a synchronous pattern.
A public broadcast signal sending module 12, configured to send a timeslot indication signal through a public broadcast channel CACH; the time slot indicating signal comprises time slot information and is used for locking a time slot number; the time slot indication signal sent by the common broadcast channel CACH includes the time slot number and is sent to the terminal device, and the terminal device can lock on the required time slot.
A channel control module 13, configured to align a first channel with a second channel slot; the first channel is a communication channel before the terminal equipment switches the channel, and the second channel is a communication channel after the terminal equipment switches the channel; the terminal device determines the time position of the downlink channel, that is, determines the starting point of the time slot of the downlink channel, such as the starting point of the time slot 1, and after the terminal device is aligned with the time slot of the downlink channel, the time slot boundary of the uplink channel is also aligned with the time slot of the downlink channel.
Before channel switching, the terminal equipment aligns the time slot by the synchronous pattern when communicating on the first channel, and locks on the needed time slot by the time slot indication information of the common broadcast channel CACH. When the terminal equipment is switched to the second channel, if the time slots between the channels are aligned and the time slot numbers transmitted in the same time window are also the same, the terminal equipment does not need to butt the time slots according to the synchronous pattern after being switched to the second channel, does not need to lock the time slots according to the time slot indication information of the common broadcast channel CACH, and can align and lock the time slots according to the information of the original channel.
As described above for the network device 1, the first channel and the second channel are issued by the same network device; that is, the channel control module can align the time slots of different channels of the same network device, and the terminal device switches the channels to switch between different channels of the same network device.
As described above in the network device 1, an absolute time is adopted between the first channel and the second channel as a time slot alignment reference time, and the time slot alignment reference time is used for determining a start point and/or an end point of a time slot; for example, it is agreed that 0 min 0 s at 30 st 15 h of 2019 is the start of slot 1, i.e., T0, all channels of the network device are aligned according to T0, and the start of slot 1 is also 0 min 0 s at 30 st 15 h of 2019 h, respectively, and the start of slot 1 is also 0 min 0 s at 30 st 15 h of 2019 h, i.e., the first channel and the second channel of the network device are aligned.
As described above in the network device 1, the GPS time or the beidou satellite navigation system time is used as the time slot alignment reference time between the first channel of the current communication and the second channel of the target communication; the absolute time used by the network device to align the channel can uniformly adopt the GPS time, the time of the beidou satellite navigation system or the absolute time of other navigation systems as the standard of time slot alignment.
As described above for network device 1, the first channel is sent out by a first network device, and the second channel is sent out by a second network device; the channel control module 13 is configured to switch, when the terminal device communicates with the network device, a first channel of the first network device to be aligned with a second channel slot of a second network device; that is, the channel control module can also align the time slots of different channels of different network devices, and the terminal device switches the channels between different channels of different network devices.
As described above, the network device 1 adopts the time of any one of the first channel and the second channel as the time slot alignment reference time; that is, one of the channels may be used as a main channel, and after the other channels are aligned with respect to the reference time of the main channel, the terminal device performs channel switching.
As described above, in the network device 1, the first channel and/or the second channel are configured by the timeslot information transmitted through the GPIO; the timeslot configuration information may be high level and/or low level; the main channel of the network device will output the timeslot configuration information through the GPIO, for example, a high level indicates timeslot 1, a low level indicates timeslot 2, and other channels of the network device or the channel of the network device know the start of timeslot 1 or timeslot 2 through the information; the rising edge may be used as the beginning of the time slot 1, and the other channels perform time slot alignment and synchronization according to the main channel time slot information given by the GPIO of the network device.
Fig. 2 is a schematic diagram illustrating a channel switching process between different channels of the same network device.
In the same network device BS1, channel 1 and channel 2 of BS1 are aligned in time, are slot boundaries at time T0, and are both slot 1 starts at time T0, since each slot is 30ms in length, the next slot, i.e., 2, starts at time T0+30ms, and loops back to slot 1 at time T0+60 ms. If the terminal device knows that T0 is the beginning of the timeslot 1 already in the channel 1 of the network device BS1, the corresponding timeslot and boundary can be known by calculating T0+ x 30ms (x is 1 or 2) after switching to the channel 2 of the base station BS1, and it is no longer necessary to determine the timeslot and boundary by the synchronization pattern SYNC and the information of the common broadcast channel CACH, which shortens the access time for switching channels.
Fig. 3 is a schematic diagram illustrating a channel switching process between channels of different network devices.
BS1 and BS2 are two different network devices, channel 1 of network device BS1 and channel 2 of network device BS2 are aligned in time, are slot boundaries at time T0, and are both slot 1 starts at time T0, since each slot is 30ms in length, is the start of the next slot, slot 2, at time T0+30ms, and cycles back to slot 1 at time T0+60 ms. If the terminal device knows that T0 is the beginning of the timeslot 1 already in the channel 1 of the network device BS1, the corresponding timeslot and boundary can be known by calculating T0+ x 30ms (x is 1 or 2) after switching to the channel 2 of the network device BS2, and it is no longer necessary to determine the timeslot and boundary by the synchronization pattern SYNC and the information of the common broadcast channel CACH, which shortens the access time for switching channels. The same method steps are also taken for the handover from channel 1 of the network device BS2 to channel 1 of the base station BS 1.
Fig. 4 is a schematic diagram of a wireless communication system, wherein the channel switching system includes a terminal device and a network device.
The network device 1 may be the network device according to any embodiment of the present application, and includes a synchronization signal sending module 11, a common broadcast signal sending module 12, and a channel control module 13.
The synchronization signal sending module 11 is configured to send a synchronization downlink signal by the network device 1; the network equipment sends a synchronous downlink signal to the terminal equipment, the synchronous downlink signal is provided with a synchronous pattern, and the terminal equipment 2 receives the synchronous downlink signal with the synchronous pattern sent by the network equipment 1; the synchronous downlink signal is used for determining a starting point and/or an ending point of a time slot, and the terminal equipment determines the starting point and/or the ending point of the time slot through a synchronous pattern.
The public broadcast signal sending module 12 is configured to send a time slot indication signal through a public broadcast channel CACH; the time slot indicating signal comprises time slot information and is used for locking a time slot number; the slot indication signal sent by the common broadcast channel CACH includes the slot number and is sent to the terminal device 2, and the terminal device 2 can lock on the required slot.
The channel control module 13 is configured to align a first channel of the network device 1 with a second channel timeslot, and/or align a first communication channel of the network device with a second channel timeslot of another network device; the network device 1 aligns the channel time slots of the network device before the channel switching, or aligns the channel time slots of another network device, so that the time slots between the channels are aligned and the time slot numbers transmitted in the same time window are also the same when the channel switching is performed, and then the terminal device does not need to butt the time slots according to the synchronous pattern after the channel switching, and does not need to lock the time slots according to the time slot indication information of the CACH, and can align and lock the time slots only according to the information of the original channel.
The terminal device 2 includes a synchronization signal receiving module 21, a timeslot indication signal receiving module 22, and a channel switching module 23.
The synchronization signal receiving module 21 is configured to receive a synchronization downlink signal sent by the network device 1, and determine a starting point and an ending point of a time slot; the terminal device 2 receives a synchronous downlink signal sent by the network device through the synchronous signal receiving module 21, the synchronous downlink signal includes a synchronous pattern, and the terminal device determines a starting point and/or an ending point of a time slot through the synchronous pattern.
The time slot indication signal receiving module 22 is configured to receive a time slot indication signal sent by a common broadcast channel CACH and lock a time slot number by the terminal device 2; the terminal device 2 receives the time slot indication signal sent by the common broadcast channel CACH, the time slot indication signal includes the time slot number, and the terminal device 2 can lock on the required time slot according to the time slot number.
The channel switching module 23 is configured to control the terminal device 2 to switch from a first channel to a second channel; the first channel is a communication channel before the terminal equipment switches the channel, and the second channel is a communication channel after the terminal equipment switches the channel; the terminal device 2 determines the time position of the downlink channel, that is, determines the time slot starting point of the downlink channel, such as the starting point of the time slot 1, and after the terminal device 2 is aligned with the time slot of the downlink channel, the time slot boundary of the uplink channel is also aligned with the time slot of the downlink channel; the channel switching module 23 may control the terminal device 2 to switch from the first channel of the same network device 1 to the second channel, or may control the terminal device 2 to switch from the first channel of the current network device to the second channel of another network device.
The terminal device can be one of a mobile terminal, a mobile phone, an automobile-mounted station and a handheld interphone.
Fig. 5 is a flowchart of a channel switching method, which includes the following steps:
step S1, aligning the channel time slots of the network equipment; before channel switching, each channel of the network equipment is aligned with the time slot, and is locked on the needed time slot through the time slot indication information of the CACH.
The standard of time slot alignment, that is, the time slot alignment reference time, can use absolute time such as GPS time or Beidou satellite navigation system time as the standard thereof, and can also use the time of any channel of the network equipment as the time slot alignment reference time; that is, any channel is used as a main channel, the time of the main channel is used as the time slot alignment reference time, the time slot configuration information transmitted by the general input/output port GPIO of the network device can be used to configure the first channel and/or the second channel, the main channel of the network device can output the time slot configuration information through the general input/output port GPIO, for example, the high level represents the time slot 1, the low level represents the time slot 2, and the other network device channels or the channel of the network device can know the start of the time slot 1 or the time slot 2 through the information; the rising edge may be used as the beginning of the time slot 1, and the other channels perform time slot alignment and synchronization according to the main channel time slot information given by the GPIO of the network device.
Step S2, the terminal equipment receives the synchronous downlink signal sent by the network equipment, the synchronous downlink signal is used for determining the starting point and/or the ending point of the time slot; the network equipment sends a synchronous downlink signal to the terminal equipment, the synchronous downlink signal is provided with a synchronous pattern, and the terminal equipment receives the synchronous downlink signal with the synchronous pattern sent by the network equipment to determine the starting point and/or the ending point of the time slot.
Step S3, the terminal equipment locks the time slot number according to the time slot indication signal of the public broadcast channel CACH; the common broadcast channel CACH sends out a time slot indicating signal which comprises time slot information and can be used for locking a time slot number; the terminal device can lock on the required slot according to the slot number.
Step S4, the communication of the terminal equipment is switched from a first channel to a second channel; after the time slots of the first channel and the second channel of the network equipment are aligned, channel switching operation is executed, as the terminal equipment aligns the time slots through the synchronous patterns before the channel switching, and locks on the required time slots through the time slot indication information of the common broadcast channel CACH, the time slots among the channels are aligned, the time slot numbers transmitted in the same time window are also the same, one channel is synchronous, all the channels are synchronous, and the time position of the downlink channel does not need to be determined again after the channel switching to a new channel.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A network device is used for a digital mobile interphone or a public digital trunking system with misaligned time slots between channels, and is characterized by comprising a synchronous signal sending module, a public broadcast signal sending module and a channel control module;
the synchronous signal sending module is used for sending a synchronous downlink signal; the synchronous downlink signal is used for determining a starting point and/or an end point of a time slot;
the public broadcast signal sending module is used for sending a time slot indicating signal through a public broadcast channel CACH; the time slot indicating signal comprises time slot information and is used for locking a time slot number;
and the channel control module is used for aligning the time slots of the first channel and the second channel before channel switching in the channel switching process, and the time slot numbers transmitted in the same time window are also the same.
2. The network device of claim 1, wherein the first channel and the second channel are transmitted by the same network device.
3. The network device of claim 2, wherein an absolute time is employed between the first channel and the second channel as a slot alignment reference time; the time slot is aligned with the reference time and used for determining the starting point and/or the end point of the time slot.
4. The network device of claim 3, wherein the time slot alignment reference time is a GPS time or a Beidou satellite navigation System time between the first channel and the second channel.
5. The network device of claim 1, wherein the first channel is transmitted by a first network device and the second channel is transmitted by a second network device.
6. The network device of claim 1, 2 or 5, wherein a time of any one of the channels is adopted as the slot alignment reference time between the first channel and the second channel.
7. The network device of claim 6, wherein the first channel and/or the second channel is configured by time slot configuration information transmitted by a general purpose input output port (GPIO) of the network device; the slot configuration information may be high and/or low.
8. A wireless communication system comprising a terminal device and a network device according to any one of claims 1 to 7;
the network equipment comprises a synchronous signal sending module, a public broadcast signal sending module and a channel control module; the synchronous signal sending module is used for the network equipment to send a synchronous downlink signal; the public broadcast signal sending module is used for sending a time slot indicating signal through a public broadcast channel CACH; the channel control module is used for aligning a first channel of the network equipment with a second channel time slot, and/or aligning the first channel sent by the first network equipment with the second channel time slot sent by the second network equipment;
the terminal equipment comprises a synchronous signal receiving module, a time slot indicating signal receiving module and a channel switching module; the synchronous signal receiving module is used for receiving a synchronous downlink signal sent by the network equipment and determining a starting point and an ending point of a time slot; the time slot indication signal receiving module is used for the terminal equipment to receive the time slot indication signal sent by the common broadcast channel CACH and lock the time slot number; the channel switching module is used for controlling the terminal equipment to be switched from a first channel to a second channel.
9. The wireless communication system of claim 8, wherein the terminal device is one of a mobile terminal, a mobile phone, an in-vehicle station, and a handheld interphone.
10. A channel switching method for use in any one of the systems of claims 8 to 9, comprising the steps of:
aligning the time slots of the network equipment channels;
the method comprises the steps that terminal equipment receives a synchronous downlink signal sent by network equipment, wherein the synchronous downlink signal is used for determining a starting point and/or an end point of a time slot;
the terminal equipment locks a time slot number according to a time slot indication signal of a common broadcast channel CACH;
and the communication of the terminal equipment is switched from the first channel to the second channel.
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| CN107018173A (en) * | 2016-01-27 | 2017-08-04 | 海能达通信股份有限公司 | Method, terminal device, network side equipment and the system of data transfer |
| CN108650643A (en) * | 2018-05-10 | 2018-10-12 | 福建科立讯通信有限公司 | A kind of effective method for reducing the signaling response time in DMR/MPT terminal devices |
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