CN106604405B - Broadband cluster wireless transmission method and system - Google Patents
Broadband cluster wireless transmission method and system Download PDFInfo
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- CN106604405B CN106604405B CN201610274443.9A CN201610274443A CN106604405B CN 106604405 B CN106604405 B CN 106604405B CN 201610274443 A CN201610274443 A CN 201610274443A CN 106604405 B CN106604405 B CN 106604405B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
- H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
- H04W74/0858—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
Abstract
The invention relates to a broadband cluster wireless transmission method, which adopts a TDD duplex mode, an OFDM multiple access mode and a semi-static resource scheduling method to enable a system to bear various services such as voice calling, video monitoring and the like. The broadband cluster wireless transmission system utilizes the broadband cluster wireless transmission method of semi-static resource allocation and adopts a TDD duplex mode and an OFDM multiple access mode, so that the cluster system can bear traditional voice services and data services with high speed such as videos. Compared with the prior art, the method has the advantages of wide bandwidth, simplified flow, low implementation difficulty and better suitability for cluster system services.
Description
Technical Field
The present invention relates to a communication technology based on voice and low-speed data transmission, and more particularly, to a broadband trunking wireless transmission method and a broadband trunking wireless transmission system.
Background
The traditional narrow-band cluster is a communication system based on voice and low-speed data transmission, occupies most of the current cluster system market, and plays an important role in commanding and scheduling. With the rapid development of the demand of wireless high-speed data services, the development of wireless communication networks has become a trend necessary for broadband. In the process of commanding and scheduling by using a trunking communication system, an industrial user needs to support the return of video images by not only listening and calling, but also seeing and seeing, but because of the bandwidth limitation of the traditional narrow-band trunking system, the broadband trunking system cannot naturally support the new requirements of the user, and therefore the broadband trunking system inevitably occupies a large share in the subsequent trunking market.
The current broadband communication systems mainly employ LTE-related protocols. The LTE system is divided into two duplex modes of TDD and FDD, the subcarrier interval is 15KHz, the downlink adopts an OFDM multiple access mode, the uplink adopts a DFT-S-OFDM multiple access mode, various bandwidth configurations (20MHz, 10MHz, 5MHz and the like) are supported, and the uplink and the downlink both adopt a dynamic resource scheduling mode indicated by a PDCCH channel.
The standard LTE protocol aims at the application scene and the service environment of a public network and does not support special service models (such as group calling, full calling, dispatching desk service and the like) required by a cluster system. In order to increase the support for the cluster special service, a related manufacturer proposes a B-Trunc communication system on the basis of a standard LTE protocol. The B-trunC communication system expands the standard LTE protocol, increases the network elements at the core network side, and modifies the air interface protocol, so that the service model required by the cluster is supported.
The disadvantages of the LTE protocol are: the method is suitable for application scenes with large bandwidth and large number of simultaneously activated services aiming at public network business operation environment, and is not suitable for application scenes of special service models of a cluster system, such as half-duplex and the like, which need to support group calling, full calling and the like. The 15KHz subcarrier spacing employed is incompatible with the 12.5KHz carrier width commonly used in current cluster systems. The adopted dynamic resource scheduling mode; different multiple access modes of the uplink and the downlink (the downlink adopts OFDM, and the uplink adopts DFT-S-OFDM); the radio frame length of 5ms or 10ms and the short uplink and downlink switching point interval all increase the implementation difficulty of related equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a broadband trunking wireless transmission method and a broadband trunking wireless transmission system which can bear traditional voice services and can also bear high-speed data services such as videos and the like.
The technical scheme of the invention is as follows:
a broadband trunking wireless transmission method, carry on the voice call service, up run video monitoring service on the basis of the wireless frame, the said wireless frame includes the data slot0 located in frame head, data slot3 located in frame end, data slot1 located in frame middle part, data slot 2;
the data slot0 is a downlink slot and is used for carrying downlink control signaling and downlink voice service;
the data slot3 is an uplink slot and is used for carrying uplink control signaling, random access indication signaling, and uplink voice service.
The data slot1 and the data slot2 are uplink slots and are used for bearing uplink video monitoring services.
Preferably, the channel structure on the data slot0 includes a downlink common signaling region and a downlink information region;
the downlink common signaling area bears 1 path of common signaling channel and is used for sending downlink common signaling;
the downlink information area bears 1 channel of user-specific voice signaling channel, which is used for sending downlink voice service data and user-specific control signaling.
Preferably, the channel structure on the data slot3 includes an uplink common signaling region, an uplink information region, and a random access detection collision region;
the public signaling area bears 1 path of public signaling channels and is used for sending the uplink public signaling;
the uplink information area bears 1 path of user special voice signaling channel, which is used for sending uplink voice service data and user special control signaling;
the random access detection conflict area is used for the mobile equipment MS to send a random access indication signaling in a conflict way in the random access process.
Preferably, the step of initiating the voice call service by the mobile device MS based on the radio frame is as follows:
1) after the mobile device MS1 completes the random access process, obtaining the uplink synchronization state, and sending a link establishment request in the uplink public signaling zone of the nth frame data slot3, wherein the link establishment request carries the call type and the ID information of the target mobile device MS or group;
2) after receiving the link establishment request, the base station device BS judges whether an idle dedicated voice signaling channel exists in the data slot0 and the data slot3, and if so, establishes the link according to different call types;
3) after the link establishment procedure is completed, the voice service is transmitted on the dedicated channels allocated on the data slot0 and the data slot 3.
Preferably, if the call type is a group call, the BS sends a link establishment request to the destination group in the downlink common signaling zone of the n +2 th frame data slot0, where the link establishment request carries channel numbers corresponding to the dedicated traffic channels allocated on the data slot0 and the data slot3, and sends a link establishment response signaling to the MS initiating the service in the downlink common signaling zone of the n +3 th frame data slot0, where the link establishment response signaling carries channel numbers corresponding to the dedicated traffic channels allocated on the data slot0 and the data slot3, thereby completing the link establishment procedure.
Preferably, if the call type is individual call, the BS sends a link establishment request to the target MS in a downlink common signaling zone of the n +2 th frame data slot0, where the link establishment request carries channel numbers corresponding to dedicated traffic channels allocated on the data slot0 and the data slot3, the target MS reports a link establishment response to the BS in an uplink common signaling zone of the n +2 th frame data slot3, and then the BS sends a link establishment response signaling to the MS initiating the traffic in the downlink common signaling zone of the n +4 th frame data slot0, where the link establishment response signaling carries channel numbers corresponding to the dedicated traffic channels allocated on the data slot0 and the data slot3, thereby completing the link establishment procedure.
Preferably, based on the radio frame, the step of initiating the uplink video monitoring service link establishment by the mobile equipment MS is as follows:
1) after the mobile equipment MS finishes the random access process, acquiring an uplink synchronous state, and sending a link establishment request in an uplink public signaling zone of an nth frame data slot3, wherein information carried in the link establishment request is a video call request;
2) after receiving the link establishment request, the BS determines whether the data slot1 or the data slot2 is idle, and whether an idle dedicated voice signaling channel exists in the data slot0 and the data slot 3; if yes, a link response request is sent to the mobile equipment MS in a downlink public signaling area of the n +2 frame data slot0, and the link response request carries the position of the distributed video service channel and the position information of the special voice signaling channel to complete a link establishment process;
3) after the link establishment process is completed, the uplink video monitoring service is transmitted on the allocated data slot1 or data slot2, and the related control signaling is transmitted on the allocated video service accompanied with the data slot0 and data slot 3.
Preferably, the radio frame further includes 1 downlink synchronization time slot and 1 GP guard time slot;
the downlink synchronization time slot is arranged behind the data time slot0 and is used for bearing a downlink synchronization sequence, and the mobile device MS obtains downlink time and performs frequency synchronization through the downlink synchronization time slot;
the GP guard time slot is arranged between the downlink time slot and the uplink time slot, and is used for avoiding the interference of the downlink time slot to the uplink time slot and providing the processing time delay for completing the conversion configuration.
Preferably, each slot in the radio frame is divided by taking an OFDM symbol as a unit, where the time domain length of the downlink synchronization slot is 1 OFDM symbol, the time domain length of the GP guard slot is 9 OFDM symbols, the time domain length of the data slot0 is 12 OFDM symbols, the time domain lengths of the data slot1 and the data slot2 are 80 OFDM symbols, and the time domain length of the data slot3 is 18 OFDM symbols.
Preferably, the length of 1 OFDM symbol is 320 sampling points, and the duration is 100 us; the length of the cyclic prefix CP filled in the OFDM symbol is 64 sampling points.
Preferably, a guard interval with a preset duration is added between the uplink time Slot and the downlink time Slot to provide a processing time delay for completing the conversion configuration, and then the data time Slot0 advances the duration of the guard interval.
Preferably, the mobile device MS initiates a random access procedure, which is as follows:
1) after the mobile equipment MS reads the cell broadcast, the downlink synchronous state is obtained, and a random access indication is sent in a random access detection collision area of an nth frame data slot3, wherein the random access indication carries a temporary random identifier of the mobile equipment MS;
2) after detecting that the mobile equipment MS initiates random access, the base station equipment BS obtains an uplink synchronous offset parameter of the mobile equipment MS, and then sends a downlink control signaling in a downlink common signaling zone of an n +2 frame data slot0, wherein the downlink control signaling carries a temporary random identifier and a synchronous adjustment command reported by the mobile equipment MS, and indicates the mobile equipment MS to perform synchronous adjustment and send the downlink control signaling;
3) after receiving the downlink control signaling, the mobile equipment MS sends an uplink signaling in the uplink public signaling zone of the n +2 th frame data slot 3;
4) after receiving the uplink signaling, the BS issues a response signaling in the n +4 th frame data slot0, where the response signaling carries the ID of the MS, and confirms the MS to complete the random access process.
Preferably, 1 OFDM symbol is occupied in the time domain, 1 subcarrier is occupied in the frequency domain, and the resource element RE is called 1 resource element RE, and the resource element RE is used for carrying 1 modulation symbol.
Preferably, the data slot1 and the data slot2 are divided into 16 sub-slots in the time domain, each 4 resource elements RE in each sub-slot include a demodulation reference signal DMRS, and the demodulation reference signal DMRS is used for receiving side synchronization detection, auxiliary data demodulation, and frequency offset adjustment;
the DMRS on the data slot0 is located on the 3 rd OFDM symbol and the 9 th OFDM symbol, and is used for receiving side detection synchronization, auxiliary data demodulation and frequency offset adjustment;
the DMRS on the data slot3 is located on the 3 rd OFDM symbol, the 9 th OFDM symbol, and the 15 th OFDM symbol, and is used for receiving side detection synchronization, auxiliary data demodulation, and frequency offset adjustment.
Preferably, in the data slot0, the downlink common signaling region occupies 48 sub-carrier bandwidths, is located at the high end of the frequency domain, and the time domain occupies 6 OFDM symbols, so as to provide 16 channels of user dedicated voice signaling channels and support 16 channels of half-duplex voice services;
in the data slot3, a downlink common signaling region occupies 48 sub-carrier bandwidths and is located at the high end of a frequency domain, a time domain occupies 6 OFDM symbols, a special voice signaling channel for 16 channels of users is provided, and 16 channels of half-duplex voice services are supported; the random access detection collision region occupies the whole data slot3 length in time domain and 72 sub-carrier bandwidths in frequency domain.
A broadband cluster wireless transmission system adopts TDD duplex mode and OFDM multiple access mode, and utilizes the broadband cluster wireless transmission method to carry voice call service, uplink video monitoring service and downlink video broadcast service through wireless frame.
Preferably, the bandwidth of the system is 3MHz, and in the OFDM multiple access scheme, the sampling rate is 3.2MHz, the subcarrier spacing is 12.5kHz, the number of FFT points is 256, and the number of subcarriers is 216.
Preferably, in each slot in the radio frame, the modulation scheme of the OFDM symbol is a QPSK modulation scheme, and a (m) represents a bit sequence to be transmitted, where m is a bit sequence number, the mapping relationship between the transmission bits and the modulation symbols is as follows:
the invention has the following beneficial effects:
the broadband cluster wireless transmission method adopts TDD duplex mode, OFDM multiple access mode and semi-static resource scheduling method, so that the system can bear various services such as voice call, video monitoring and the like.
The broadband cluster wireless transmission system utilizes the broadband cluster wireless transmission method of semi-static resource allocation and adopts a TDD duplex mode and an OFDM multiple access mode, so that the cluster system can bear traditional voice services and data services with high speed such as videos.
Compared with the prior art, the method has the advantages of wide bandwidth, simplified flow, low implementation difficulty and better suitability for cluster system services.
Drawings
Fig. 1 is a schematic diagram of a type of radio frame;
fig. 2 is a schematic diagram of a resource unit by taking a data slot0 as an example;
fig. 3 is a schematic structural diagram of data slot1 and data slot 2;
fig. 4 is a schematic diagram of the structure of a data slot 0;
fig. 5 is a schematic diagram of the structure of a data slot 3;
fig. 6 is a schematic diagram of a channel structure of a data slot 0;
fig. 7 is a schematic diagram of a channel structure of a data slot 3;
fig. 8 is a flow chart illustrating the initiation of random access by a mobile device MS;
fig. 9 is a schematic diagram of a link establishment flow of a voice call service initiated by a mobile device MS;
fig. 10 is a schematic diagram of a link establishment flow of an uplink video monitoring service initiated by a mobile device MS.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention provides an advanced wireless frame structure for solving the defects in the prior art, and realizes broadband trunking wireless transmission on the basis of the wireless frame.
As shown in fig. 1, the slot length of the radio frame is divided in units of OFDM symbols.
The radio frame length is 20ms, and 64000 sampling points comprise 6 slots: data slot0, data slot1, data slot2, data slot0, downlink synchronization slot (dl sync slot), and GP guard slot.
One OFDM symbol (symbol) length is 256+64 ═ 320 samples, duration: 100 us. To support wide coverage cell configuration and combat inter-symbol interference (ISI) caused by multipath effects, the cyclic prefix CP length is 64 samples (delay spread 20us, 6 km). Thus there are 200 OFDM symbols in a 20ms radio frame.
As shown in fig. 2, a Resource Element (RE) is called as a Resource Element (RE) and is a minimum unit for allocating resources, where the time domain occupies 1 OFDM symbol and the frequency domain occupies 1 subcarrier.
Downlink synchronization slot (dl sync slot): the time domain length is 1 OFDM symbol (100us), and carries a downlink synchronization sequence, which is used for a mobile device MS to acquire accurate downlink time and frequency synchronization.
GP guard time slot: the time domain length is 9 OFDM symbols (900us), and the total number of sampling points is 2700, which is mainly used for avoiding the interference of a downlink channel to an uplink channel under the condition of long-distance coverage and the processing time delay required by the radio frequency of the communication equipment to complete the receiving/sending conversion.
In addition, 20.3125us guard interval is added between the transition points from the uplink time slot to the downlink time slot, which is also used for the processing delay needed by the radio frequency of the communication device to complete the receiving/transmitting transition, i.e. the data slot0 needs to start in advance of 20.3125 us.
Data time slot: the time domain length of the data slot0 is 12 OFDM symbols (1.2ms), the time domain length of the data slot1 and the data slot2 is 80 OFDM symbols (8ms), and the time domain length of the data slot3 is 18 OFDM symbols (1.8 ms).
The data slot1 and the data slot2 each carry 1 channel of video service channels, and can respectively carry 1 channel of uplink video monitoring service, and the specific structure is shown in fig. 3. The data slot1 and the data slot2 are divided into a plurality of sub-slots in the time domain, each sub-slot occupies 0.5ms, and the total number of the sub-slots is 16. The map of the DMRS for demodulating the reference signal at each sub-slot is shown in fig. 3: and each 4 REs have a DMRS signal which is used for the functions of detecting synchronization, assisting data demodulation, carrying out frequency offset adjustment and the like of a receiving party.
The data slot0 carries low bandwidth traffic channels such as downlink control signaling and downlink voice traffic, the time domain length is 12 symbols (1.2ms), and the specific structure is shown in fig. 4. The DMRS on the data slot0 is located on symbol2 and symbol8, occupies the entire system bandwidth, and is used for the receiver to detect synchronization, assist data demodulation, and perform frequency offset adjustment.
The data slot3 carries low bandwidth traffic channels such as an uplink control signaling, a random access indication signaling, and an uplink voice service, and the time domain length is 18 symbols (1.8ms), which is specifically shown in fig. 5. The DMRS on the data slot3 is located on symbol2, symbol8, or symbol14, occupies the entire system bandwidth, and is used for the receiver to detect synchronization, assist data demodulation, perform frequency offset adjustment, and so on.
In order to facilitate the allocation and scheduling of resources, the invention adopts a semi-static resource scheduling method, that is, a data slot1 and a data slot2 are fixed to only carry one path of video service, and the resources are allocated and occupied on the data slot0 and the data slot3 by using a fixed resource division mode, and the allocated resource block is called as a channel.
The channel structure on the data slot0 is shown in fig. 6, and is divided into two regions, which are respectively used for carrying different types of data:
in the downlink common signaling area, a frequency domain occupies 48 sub-carrier bandwidths and is positioned at the high end of the frequency domain; the time domain occupies 6 symbol lengths (symbol6-symbol11), and carries 1 common signaling channel, which is used for sending downlink common signaling, for example: system broadcast, registration response, link establishment response, etc.
In the downlink information region, a frequency domain with 24 sub-carrier bandwidths and 6 symbol time domain lengths are used as resource units to carry 1 channel of user-specific voice signaling channel for sending downlink voice service data and user-specific control signaling, and at most 16 channels of user-specific voice signaling channels (numbered sequentially from the low end position to the high end position of the frequency domain as shown in fig. 6) can be provided to support 16 channels of half-duplex voice services.
The channel structure on data slot3 is divided into three regions as shown in fig. 7, and each region is used for carrying different types of data.
In the uplink common signaling region, a frequency domain occupies 48 sub-carrier bandwidths and is positioned at the high end of the frequency domain; the time domain occupies 6 symbol lengths (symbol12-symbol17), and carries 1 common signaling channel, which is used for sending uplink common signaling, such as: registration requests, link establishment requests, and the like.
The uplink information region uses 24 sub-carrier bandwidths in the frequency domain and 6 symbols (0.6ms) in the time domain as a resource unit, carries 1 channel of user-specific voice signaling channels, is used for sending uplink voice service data and user-specific control signaling, and can provide 16 channels of user-specific voice signaling channels (numbered from the low end position to the high end position of the frequency domain in sequence as shown in fig. 7) in total to support 16 channels of half-duplex voice services.
The random access detection collision region occupies the whole data slot3 length (1.8MS) in time domain, and occupies 72 sub-carrier bandwidths in frequency domain, and is used for mobile equipment MS to send a random access indication signaling in a collision way in the random access process.
According to the above description of the channel structure of the data slot0 and the data slot3, during resource allocation, according to the numbers shown in fig. 6 and 7, semi-static allocation is performed in the link establishment phase, that is, the number of the uplink and downlink channel used is specified in the link establishment phase, and during the subsequent service duration, the mobile device MS only performs data transmission and reception on the allocated channel. And the common signaling (such as registration request response, link establishment request response and the like) is uniformly sent and received on the common signaling channels of the data slot0, the downlink common signaling zone of the data slot3 and the uplink common signaling zone, so that the implementation complexity on resource scheduling can be greatly reduced.
Based on the method, the invention also provides a broadband trunking wireless transmission system which adopts a TDD duplex mode and an OFDM multiple access mode and utilizes the broadband trunking wireless transmission method to carry voice call service and uplink video monitoring service.
The bandwidth of the system adopts 3MHz, in OFDM multiple access mode, the sampling rate is 3.2MHz, the subcarrier interval is 12.5kHz (compatible with the carrier width of the traditional narrow-band cluster system), the number of FFT points is 256, and the number of subcarriers is 216.
In each time slot in the radio frame, the modulation mode of the OFDM symbol adopts a QPSK modulation mode, and let a (m) represent a bit sequence to be transmitted, where m is a bit sequence number, and then the mapping relationship between the transmission bit and the modulation symbol is as follows:
the BS may send downlink system broadcast information or control signaling on the downlink common signaling channel of the data slot0 at regular time, so as to indicate information such as cell parameters.
If a mobile device MS needs to access a system to initiate a service, a random access process needs to be initiated, and an uplink synchronization state is obtained to send a signaling, as shown in fig. 8, the specific process is as follows:
after reading the cell broadcast, the MS obtains a downlink synchronization state, and sends a random access indication in a random access detection collision zone of the data slot3 of the nth frame, where the random access indication carries a temporary random identifier of the MS, so that the BS distinguishes and simultaneously initiates multiple randomly accessed MS (where more air interface resources are allocated in the collision detection zone, and a special reliable algorithm may be used for detection, for example, a Preamble ID detection method used by the LTE protocol is used, and the message is referred to as MSg 1). After detecting that a mobile device MS possibly initiates random access, a base station device BS calculates and obtains an uplink synchronization offset parameter of the mobile device MS according to a certain algorithm, and then issues a control signaling (this message is referred to as MSg2) in a downlink common signaling zone of an n +2 th frame data slot0, where the control signaling carries a temporary random identifier and a synchronization adjustment command reported by the mobile device MS, and instructs the mobile device MS to perform synchronization adjustment and to issue the control signaling. After receiving the downlink control signaling, the MS sends an uplink signaling to be reported in the uplink public signaling zone of the n +2 th frame data slot3, for example: cell registration, synchronization recovery request, etc., and this step is also performed to finally determine whether the above MSg2 is issued for the mobile device MS through signaling interaction. After receiving the signaling sent by the user, the BS sends a response signaling (which carries the MS ID of the mobile device) in the n +4 th frame data slot0, so as to confirm the MS and finally complete the random access process.
The transmission method of the invention supports voice call service and uplink video monitoring service.
As shown in fig. 9, the link establishment process of the voice call service initiated by the mobile station MS specifically includes the following steps:
after the MS1 completes the random access process, the MS1 obtains the uplink synchronization state, and sends a link establishment request in the nth frame data slot3 public signaling zone, where the link establishment request carries the call type: a group call or an individual call, and ID information of the destination mobile equipment MS or group.
After receiving the link establishment request, the BS determines whether air interface channel resources are idle, that is, determines whether idle dedicated voice signaling channels exist in the data slot0 and the data slot3, and if so, performs different processing according to different call types.
If the group call is performed, the BS sends a link establishment request to the destination group in the downlink common signaling zone of the n +2 th frame data slot0, where the link establishment request carries channel numbers (0-15) corresponding to the dedicated traffic channels allocated in the data slot0 (downlink) and the data slot3 (uplink), and sends a link establishment response signaling to the MS initiating the service in the downlink common signaling zone of the n +3 th frame data slot0, where the link establishment request also carries channel numbers (0-15) corresponding to the dedicated traffic channels allocated in the data slot0 (downlink) and the data slot3 (uplink), thereby completing the link establishment procedure.
If the call is an individual call, the BS sends a link establishment request to the target MS in the downlink common signaling zone of the n +2 th frame data slot0, where the link establishment request carries a channel number (0-15) corresponding to a dedicated traffic channel allocated in the data slot0 (downlink) and the data slot3 (uplink), the target MS reports a link establishment response to the BS in the uplink common signaling zone of the n +2 th frame data slot3, and then the BS sends a link establishment response signaling to the MS initiating a service in the downlink common signaling zone of the n +4 th frame data slot0, where the link establishment response signaling carries a channel number (0-15) corresponding to a dedicated traffic channel allocated in the data slot0 (downlink) and the data slot3 (uplink), thereby completing a link establishment procedure.
After the link establishment procedure is completed, the voice service is transmitted on the dedicated channels allocated on the data slot0 and the data slot 3.
The uplink video monitoring service is characterized by uplink unidirectional transmission without a called party, so that only signaling interaction between the mobile equipment MS and the base station equipment BS is required. As shown in fig. 10, the process of initiating uplink video monitoring service link establishment by the mobile device MS is specifically as follows:
after the mobile device MS completes the random access process, the uplink synchronization state is obtained, and a link establishment request is sent in the uplink public signaling zone of the nth frame data slot3, where the carried information is a video call request.
After receiving the link establishment request, the BS determines whether the video traffic channel resource and the dedicated voice signaling channel are idle, i.e., whether the data slot1 or the data slot2 is idle, and whether an idle dedicated voice signaling channel exists in the data slot0 and the data slot 3. If the mobile station is idle, a link response request is sent to the mobile station MS in the downlink common signaling zone of the n +2 frame data slot0, where the link response request carries the position information of the allocated video service channel and the position information of the dedicated voice signaling channel (called as a video service accompanying signaling channel), and the link establishment procedure is completed.
After the link establishment process is completed, the video monitoring service is transmitted on the allocated video service channel (data slot1 or data slot2), and the related control signaling is transmitted on the allocated video service accompanying signaling channel (data slot0 and data slot 3).
The above examples are provided only for illustrating the present invention and are not intended to limit the present invention. Changes, modifications, etc. to the above-described embodiments are intended to fall within the scope of the claims of the present invention as long as they are in accordance with the technical spirit of the present invention.
Claims (17)
1. A broadband trunking wireless transmission method is characterized in that voice call service and uplink video monitoring service are carried out based on wireless frames, wherein the wireless frames comprise a data slot0 positioned at a frame head, a data slot3 positioned at a frame tail, a data slot1 positioned in the middle of the frame and a data slot 2;
the data slot0 is a downlink slot and is used for carrying downlink control signaling and downlink voice service;
the data slot3 is an uplink slot and is used for bearing an uplink control signaling, a random access indication signaling and an uplink voice service;
the data slot1 and the data slot2 are uplink slots and are used for bearing uplink video monitoring services; based on the wireless frame, the steps of the mobile equipment MS initiating the voice call service are as follows:
1) after the mobile device MS1 completes the random access process, obtaining the uplink synchronization state, and sending a link establishment request in the uplink public signaling zone of the nth frame data slot3, wherein the link establishment request carries the call type and the ID information of the target mobile device MS or group;
2) after receiving the link establishment request, the base station device BS judges whether an idle dedicated voice signaling channel exists in the data slot0 and the data slot3, and if so, establishes the link according to different call types;
3) after the link establishment procedure is completed, the voice service is transmitted on the dedicated channels allocated on the data slot0 and the data slot 3.
2. The broadband trunking radio transmission method of claim 1 wherein the channel structure on the data slot0 comprises a downlink common signaling zone, a downlink information zone;
the downlink common signaling area bears 1 path of common signaling channel and is used for sending downlink common signaling;
the downlink information area bears 1 channel of user-specific voice signaling channel, which is used for sending downlink voice service data and user-specific control signaling.
3. The broadband trunking radio transmission method of claim 2 wherein the channel structure on the data slot3 comprises an uplink common signaling zone, an uplink information zone, and a random access detection collision zone;
the public signaling area bears 1 path of public signaling channels and is used for sending the uplink public signaling;
the uplink information area bears 1 path of user special voice signaling channel, which is used for sending uplink voice service data and user special control signaling;
the random access detection conflict area is used for the mobile equipment MS to send a random access indication signaling in a conflict way in the random access process.
4. The broadband trunking wireless transmission method of claim 3, wherein if the call type is a group call, the base station device BS sends a link establishment request to the destination group in the downlink common signaling zone of the n +2 th frame data slot0, the link establishment request carries channel numbers corresponding to the dedicated traffic channels allocated on the data slot0 and the data slot3, and sends a link establishment response signaling to the mobile device MS initiating the service in the downlink common signaling zone of the n +3 th frame data slot0, the link establishment response signaling carries channel numbers corresponding to the dedicated traffic channels allocated on the data slot0 and the data slot3, and the link establishment procedure is completed.
5. The broadband trunking wireless transmission method of claim 3, wherein if the call type is individual call, the base station device BS sends a link establishment request to the destination mobile device MS in a downlink common signaling zone of an n +2 th frame data slot0, the link establishment request carries channel numbers corresponding to dedicated traffic channels allocated on a data slot0 and a data slot3, the destination mobile device MS reports a link establishment response to the base station device BS in an uplink common signaling zone of an n +2 th frame data slot3, then the base station device BS sends a link establishment response signaling to the mobile device MS initiating the service in the downlink common signaling zone of an n +4 th frame data slot0, the link establishment response signaling carries channel numbers corresponding to dedicated traffic channels allocated on a data slot0 and a data slot3, and the link establishment procedure is completed.
6. The method of claim 3, wherein the step of the mobile station MS initiating uplink video monitoring service link establishment based on the radio frame is as follows:
1) after the mobile equipment MS finishes the random access process, acquiring an uplink synchronous state, and sending a link establishment request in an uplink public signaling zone of an nth frame data slot3, wherein information carried in the link establishment request is a video call request;
2) after receiving the link establishment request, the BS determines whether the data slot1 or the data slot2 is idle, and whether an idle dedicated voice signaling channel exists in the data slot0 and the data slot 3; if yes, a link response request is sent to the mobile equipment MS in a downlink public signaling area of the n +2 frame data slot0, and the link response request carries the position of the distributed video service channel and the position information of the special voice signaling channel to complete a link establishment process;
3) after the link establishment process is completed, the uplink video monitoring service is transmitted on the allocated data slot1 or data slot2, and the related control signaling is transmitted on the allocated video service accompanied with the data slot0 and data slot 3.
7. The method of claim 1, wherein the radio frame further comprises 1 downlink synchronization slot and 1 GP guard slot;
the downlink synchronization time slot is arranged behind the data time slot0 and is used for bearing a downlink synchronization sequence, and the mobile device MS obtains downlink time and performs frequency synchronization through the downlink synchronization time slot;
the GP guard time slot is arranged between the downlink time slot and the uplink time slot, and is used for avoiding the interference of the downlink time slot to the uplink time slot and providing the processing time delay for completing the conversion configuration.
8. The method of claim 7, wherein each slot in the radio frame is divided by taking OFDM symbol as a unit, and wherein the time domain length of the downlink synchronization slot is 1 OFDM symbol, the time domain length of the GP guard slot is 9 OFDM symbols, the time domain length of the data slot0 is 12 OFDM symbols, the time domain lengths of the data slot1 and the data slot2 are 80 OFDM symbols, and the time domain length of the data slot3 is 18 OFDM symbols.
9. The broadband trunking radio transmission method of claim 8 wherein 1 OFDM symbol is 320 samples long and 100us long; the length of the cyclic prefix CP filled in the OFDM symbol is 64 sampling points.
10. The method of claim 1, wherein the guard interval of a preset duration added between the uplink timeslot and the downlink timeslot provides a processing delay to complete the conversion configuration, and the data timeslot Slot0 advances the duration of the guard interval.
11. The broadband trunking radio transmission method of claim 3 wherein the mobile device MS initiates the random access procedure as follows:
1) after the mobile equipment MS reads the cell broadcast, the downlink synchronous state is obtained, and a random access indication is sent in a random access detection collision area of an nth frame data slot3, wherein the random access indication carries a temporary random identifier of the mobile equipment MS;
2) after detecting that the mobile equipment MS initiates random access, the base station equipment BS obtains an uplink synchronous offset parameter of the mobile equipment MS, and then sends a downlink control signaling in a downlink common signaling zone of an n +2 frame data slot0, wherein the downlink control signaling carries a temporary random identifier and a synchronous adjustment command reported by the mobile equipment MS, and indicates the mobile equipment MS to perform synchronous adjustment and send the downlink control signaling;
3) after receiving the downlink control signaling, the mobile equipment MS sends an uplink signaling in the uplink public signaling zone of the n +2 th frame data slot 3;
4) after receiving the uplink signaling, the BS issues a response signaling in the n +4 th frame data slot0, where the response signaling carries the ID of the MS, and confirms the MS to complete the random access process.
12. The method of claim 8, wherein 1 OFDM symbol is occupied in the time domain and 1 subcarrier is occupied in the frequency domain, which is called 1 resource element RE, and the resource element RE is used to carry 1 modulation symbol.
13. The method of claim 12, wherein the data slot1 and the data slot2 are time-domain divided into 16 sub-slots, and each sub-slot contains a demodulation reference signal DMRS for receiver synchronization detection, data demodulation assistance, and frequency offset adjustment every 4 resource elements RE;
the DMRS on the data slot0 is located on the 3 rd OFDM symbol and the 9 th OFDM symbol, and is used for receiving side detection synchronization, auxiliary data demodulation and frequency offset adjustment;
the DMRS on the data slot3 is located on the 3 rd OFDM symbol, the 9 th OFDM symbol, and the 15 th OFDM symbol, and is used for receiving side detection synchronization, auxiliary data demodulation, and frequency offset adjustment.
14. The broadband trunking wireless transmission method of claim 8, wherein in the data slot0, the downlink common signaling zone occupies 48 sub-carrier bandwidths, is located at the high end of the frequency domain, and the time domain occupies 6 OFDM symbols, providing 16 channels of user dedicated voice signaling channels, and supporting 16 channels of half-duplex voice services;
in the data slot3, a downlink common signaling region occupies 48 sub-carrier bandwidths and is located at the high end of a frequency domain, a time domain occupies 6 OFDM symbols, a special voice signaling channel for 16 channels of users is provided, and 16 channels of half-duplex voice services are supported; the random access detection collision region occupies the whole data slot3 length in time domain and 72 sub-carrier bandwidths in frequency domain.
15. A broadband trunking radio transmission system characterized in that it uses TDD duplex mode and OFDM multiple access, and uses the method of any of claims 1 to 14 to carry voice call service, uplink video monitoring service and downlink video broadcast service over radio frames.
16. The broadband trunking wireless transmission system of claim 15 wherein the bandwidth of the system is 3MHz, and in OFDM multiple access, the sampling rate is 3.2MHz, the subcarrier spacing is 12.5kHz, the number of FFT points is 256, and the number of subcarriers is 216.
17. The broadband trunking radio transmission system of claim 15 wherein, in each slot of the radio frame, the modulation scheme of the OFDM symbol is QPSK modulation scheme, and let a (m) denote the bit sequence to be transmitted, where m is the bit sequence number, the mapping relationship between the transmission bits and the modulation symbols is as follows:
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| CN109756853B (en) * | 2017-11-03 | 2021-08-20 | 普天信息技术有限公司 | Audio and video return link establishing method in broadband cluster system |
| CN109041253B (en) * | 2018-09-06 | 2020-11-20 | 北京遥测技术研究所 | Diversity access method and system based on iterative detection in unmanned aerial vehicle cluster measurement and control |
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