CN104205987B - The compatible channel effectively coexisted for voice and data business - Google Patents

The compatible channel effectively coexisted for voice and data business Download PDF

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Publication number
CN104205987B
CN104205987B CN201180054146.9A CN201180054146A CN104205987B CN 104205987 B CN104205987 B CN 104205987B CN 201180054146 A CN201180054146 A CN 201180054146A CN 104205987 B CN104205987 B CN 104205987B
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China
Prior art keywords
time slot
circuit
channel
quasi
calling
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CN201180054146.9A
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Chinese (zh)
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CN104205987A (en
Inventor
戴维·J·蔡特-莱亚
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摩托罗拉解决方案公司
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Priority to GB1018935.5A priority Critical patent/GB2485355B/en
Priority to GB1018935.5 priority
Application filed by 摩托罗拉解决方案公司 filed Critical 摩托罗拉解决方案公司
Priority to PCT/US2011/057443 priority patent/WO2012064495A1/en
Publication of CN104205987A publication Critical patent/CN104205987A/en
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Publication of CN104205987B publication Critical patent/CN104205987B/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/15Setup of multiple wireless link connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1205Schedule definition, set-up or creation
    • H04W72/121Schedule definition, set-up or creation for groups of terminals or users
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/08Trunked mobile radio systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/06Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

Voice-and-data grouping is transmitted during the time slot of the quasi- circuit-mode of data physical channel.Time slot can include multiple callings, allow at the same call supervision.Additional bandwidth can provide synchronous End to End Encryption, signaling or data, and may or may not be intended to reach the receiver involved by any one of calling.Time slot mark is to belong to channel, compatible with the time slot on data channel by the header started in time slot, and includes to indicate that the information in time slot is intended to reach the indicator for the equipment for being not involved in any calling in time slot.Each calling also includes unique header, and whether which indicates the call information of calling, including include data in time slot.Individually distribution uplink channel and downlink channel.When calling or speech items terminate, data physical channel is monitored for the relevant signaling of subsequent voice calls.

Description

The compatible channel effectively coexisted for voice and data business

Technical field

The present invention relates to communication means, and in particular it relates to the method for providing speech frame in quasi- circuit-mode channel.

Background technology

Such as cellular phone or the mobile radio communications system of private mobile radio's communication system exist via infrastructure Movement station(It is referred to as user)Between Radio Communications Link is provided.The infrastructure includes fixation means, such as one or more A base station(BS), controller etc..Mobile communication system is operated generally according to a set of industrial standard or agreement.This standard Example be European Telecommunications Standards Institute(ETSI)The terrestrial trunked radio of definition(TETRA)Standard.According to TETRA standards into The system of row operation is referred to as TETRA systems.Mainly for such as providing, those of emergency services profession is wireless to be used TETRA systems The use at family and design.

TETRA systems use time division multiple acess(TDMA)Operating protocol, wherein communication is carried out in continuous timing architecture It is synchronous.The timing architecture includes time slot, frame and multiframe.4 time slots form frame, and 18 frames constitute multiframe.According to sending Signaling type, communication can be located at different types of physical channel on.For example, in control physical channel(Hereinafter referred to as Control channel)It is upper to send for system synchronization and the control signal of control and the transmission of user grouping mode data, and in industry The circuit mode data of voice and user is sent on business physical channel, wherein the channel comprising voice is referred to as voice physical channel (Hereinafter referred to as voice channel).The control channel distributed for the transmission of user grouping mode data is referred to below as data Channel.The different time slot of these channel occupancies.Term " data " as used herein refers to comprising image, message and other data Grouping includes audio without referring to(That is, voice/sound)Grouping.

According to the TETRA systems of existing standard operation(TETRA1)For audio communication, and provide limited slow number According to communication.Developing a kind of new second generation TETRA standards(TETRA2).When offer is for example for database access or image Transmission rather than the high speed of audio communication communicate when, use these standards.A kind of form of TETRA2 standards is referred to as TETRA Enhance data service(TEDS)Standard.TETRA1 provides uniform intervals between the RF channels of 25kHz.TEDS is orthogonal according to using Amplitude is modulated(QAM)Desired data rates come provide can be selected in 25KHz, 50KHz, 100KHz or 150kHz it is multiple not Same channel spacing.TETRA1 systems and TETRA2 systems can share common frequency spectrum --- for example, TETRA1 channels have The channel width and channel center frequency of 25kHz channels are in 380.100MHz, and TEDS channels have the channel of 100kHz Bandwidth and channel center frequency is in 380.1625MHz.Due to supporting higher modulation rate, thus TEDS can for TETRA1 provides the coverage area of enhancing similar to the user of number, and can provide the capacity of enhancing, because can accommodate more Largely(Voice)Calling.

In TETRA systems, it is especially desired to when in calling while sound and grouped data can be provided.In general, Physical channel in TETRA1 systems is the frequency for including logic channel, and in the logic channel, distribution regular time slots repeat mould Formula(That is, having the time slot of uniform delays therebetween), to form the circuit for carrying voice or data call on the physical channel.These Logic channel is referred to as circuit-mode channel.One audio call occupies 1 time slot per frame(1:4TDMA patterns).Data are exhaled It cries(Including data but do not include acoustic information)Can merge time slot, and using 1,2,3 or 4 time slot for compared with Wide bandwidth.TETRA1 individually supports data channel and multislot packet data channel, this allows to come by using agreement appropriate Carry the packet from multiple users.TEDS offers channel architecture identical with Packet Data Channel, but as described above, Different channels are provided support for the different throughput capabilities of data using different modulation schemes and bandwidth.However, working as Preceding no system can provide sound and grouped data simultaneously.

Specifically, the physical separation of the voice-and-data channel in TETRA1 systems efficiency in terms of carrying data is low.To the greatest extent Pipe is that voice remains circuit-mode channel, but even if the channel idle, can not carry on this channel for being distributed Calling except any user data.In addition, channel of the distribution for data transmission must can be assigned to voice It is deallocated before calling, this is time-consuming and results in poor efficiency.Although specific TETRA2 embodiments can allow Voice is carried in packet on data channel(For example, ip voice), but since each high layer packets agreement needs have Wherein include the header of the their own of specific information, causes this method opposite multiple bits of high layer packets agreement distribution It is inefficient.In addition, any this mechanism of carrying packets of voice still needs Packet Data Channel resource on a data channel It is continually assigned to the device of calling, due to once only can a limited number of access chance be distributed to data transmission, Also poor efficiency is brought.

Existing TETRA schemes can carry an audio call per time slot, wherein the 2 of audio is transmitted in each time slot A frame.Especially using higher modulation rate and the more bits of every time slot that than one audio call uses can be supported in channel In the case of, it is expected that increased audio call number is carried, more effectively to utilize particular physical channel.It is also expected to retaining and counting It is believed that the compatibility in road and the ability in the channel mixing voice-and-data(Sound and grouped data are provided), and It is not to distribute individual channel to different types of information.

Description of the drawings

In each independent view of attached drawing, identical reference numeral indicates identical or functionally similar element, attached Figure is incorporated into specification together with following detailed description and forms part of specification, and general for further illustrating The embodiment of thought and the various principle and advantages for being used to explain those embodiments.

Fig. 1 illustrates the embodiments of communication system.

Fig. 2 illustrates the internal frame diagram of the embodiment of communication equipment.

Fig. 3 shows one embodiment of the timing diagram of quasi- circuit-mode channel.

Fig. 4 shows one embodiment of the flow chart of BTS.

Fig. 5 shows one embodiment of the flow chart of movement station.

Suitably illustrate that device and method component, attached drawing are illustrated only and managed by conventional symbol in the accompanying drawings Those of the related specific detail of illustrated embodiment is solved, not make the disclosure and this field for benefiting from benefit described here Those of those of ordinary skill to will be apparent those details mutually chaotic.Therefore it is public that there may be such as those skilled in the art The other elements known.

Specific implementation mode

Describe communication means and communication equipment and communication system, wherein during the time slot of quasi- circuit-mode channel Transmit voice and/or data.Quasi- circuit-mode channel is based upon on the physical channel of bearer data transmission, and therefore can be with It is logical control channel(Because usually data can be carried in control channel type).When quasi- circuit-mode channel is using routine Gap repetition rate, but lower layer's header(Such as MAC header)As the prefix of each time slot, lower layer's header use with for number It is believed that the identical format of equivalent header for the grouping that the data on road use, and can only be header, and therefore can be with number It is believed that the transmission of other grouped datas is compatible on road.Packets of voice in time slot is not encapsulated in packet, to eliminate Above-mentioned poor efficiency.Time slot can include multiple speech frames, and can include multiple callings.The reception function of such as movement station Enough while monitoring these callings.Data in time slot may or may be not intended to reach the time slot calling any one In involved communication equipment.In addition to data(Or the replacement as data), additional bandwidth(More than being only used in a slot Transmit the bandwidth of voice)It may be used to provide End to End Encryption synchronization or signaling.In addition, signaling can in data physical channel Other callings it is related, and be addressed to the communication equipment for being not engaged in any calling in this timeslot.

Lower layer's header at time slot beginning includes various indicators, to indicate including to be intended to reach to be not engaged in the time slot The information of the communication equipment of any calling in time slot.The header can also include about on associated with downlink time slots Then the information of the state of uplink time slots, the header can be used by receiver.Each calling can also include unique header, Whether the uniqueness header indicates the call information of the calling, such as the data of receiver comprising in a slot.In transmitter Uplink channel and downlink channel between receiver can be also assigned separately so that be distributed different callings Corresponding time slot.Ongoing calling is participated in if the communication equipment of quasi- circuit-mode call cannot be participated in, in circuit Another calling is established on mode channel, and suitably keeps ongoing calling, or again by ongoing calling Assign to circuit-mode channel.Similarly, if the communication equipment that cannot participate in quasi- circuit-mode call leaves traditional circuit mould Calling on formula channel, and the every other communication equipment called can participate in quasi- circuit-mode call, then by calling weight Newly assign to quasi- circuit-mode channel.

Fig. 1 illustrates the general networkings 100 including infrastructure 110.There are the members of many distributions in infrastructure 110 Part, some parts are closer to each other, other are arranged to geographically away from each other.Such element includes base station 120, for side Just one of those is illustrated only.The one or more subscribers 130 in overlay area serviced by base station 120, each base station 120 The connection to the other equipment in same coverage area or in distinct coverage region is provided by infrastructure 110. Subscriber 130 may, for example, be such as cellular phone, personal digital assistant or the movement station used by ambulance paramedic.

One in communication equipment is shown in a block diagram of fig. 2(For example, base station 120 or subscriber 140)Embodiment.In addition to Other assemblies, communication equipment 200 can include the transmitting-receiving that processor 202 includes transmitter circuitry 206 and receiver circuit 208 Device 204, antenna 222, I/O equipment 212, program storage 214, buffer memory 216, one or more communication interfaces 218 With portable storage tank 220.Transmitter circuitry 206 and receiver circuit 208 allow communication equipment to be desirably used as transmitter (Transmit information)Or receiver(Receive information).Communication equipment 200 is preferably integrated unit, and at least can include figure 2 discribed all elements and make communication equipment 200 execute the required any other element of its electric function.Electronic component It is connected by bus 224.

Processor 202 includes one or more microprocessors, microcontroller, DSP, state machine, logic circuit or is based on behaviour Make or programming instruction handles any other equipment or multiple equipment of information.Such operation or programming instruction are stored in journey In sequence memory 214, and it may include instruction(The estimation and correction and executed by processor 202 that such as docking is collected mail number Encryption/decryption)And with transmission the relevant information of signal(Such as modulation, tranmitting frequency or signal amplitude).Program storage 214 can be IC memory chips, including any type of random access memory(RAM)And/or read-only memory(ROM)、 Floppy disk, CD(CD)ROM, hard disk, digital video disc(DVD), flash memory card or for store digital information it is any its His medium.Those skilled in the art are it will be recognized that when the one or more functions of processor 202 are by state machine or logic When circuit executes, including the memory 214 of corresponding operating instruction can be embedded in state machine or logic circuit.In detail below The operation of the rest part execution of processor 202 and communication equipment 200 is described.

Transmitter circuitry 206 and receiver circuit 208 enable communication equipment 200 to be respectively transmitted and receive communication letter Number.In this regard, transmitter circuitry 206 and receiver circuit 208 include the proper circuit that can be wirelessly transferred.Transmitter circuitry 206 and receiver circuit 208 realization of the realization depending on communication equipment 200 and the equipment being in communication with.For example, root According to known technology, transmitter circuitry 206 and receiver circuit 208 may be implemented as the one of communication equipment hardware and software architecture Part.Those skilled in the art will recognize that the major part of transmitter circuitry 206 or receiver circuit 208 rather than whole Function can be in processor(Such as processor 202)Middle realization.However, processor 202, transmitter circuitry 206 and reception are electromechanical Road 208 is artificially separated herein, to promote to more fully understand.Buffer memory 206 can be any type of volatibility Memory, such as RAM, and the information for receiving or transmitting for interim storage.

Communication equipment 200 can also include a variety of I/O equipment, such as keyboard with alphanumeric key;Display(Example Such as, LED, OLED), show the information about communication equipment or with the relevant communication of communication equipment;Soft key and/or hardkey;It touches Touch screen;Control stick;Microphone and loud speaker.

As above, it is intended to provide significantly more efficient channel to use, realize to multiple and different voice transmissions(Independent equipment-is set Standby transmission or multicast device are transmitted to multiple equipment)While monitor, and realize voice is transmitted in same logical channel And data.Multiple or whole time slots of the quasi- circuit-mode channel occupancy physical channel of logic, and using suitable and provide The modulation scheme of high power capacity, for example, TEDS channels.Loaded packet data and signaling on the physical channel in a conventional manner(That is, its Including with formatting and error correction with TETRA2 Packet Data Channel similar modes), and grouped data and signaling use biography System agreement, such as media access control(MAC), logic link control(LLC), mobile link entity(MLE)It is related to sub-network Convergence protocol(SNDCP)(When needed).The above-mentioned logic channel for being defined as regular time slot pattern can be preserved for controlling Activity.Base station, which can fix the modulation of the all-calls carried on the physical channel, either data rate or can pass through this Mechanism known to field dynamically or adaptively changes them.Modulation and data speed adjust can institutes on the physical channel The calling of carrying starts or occurs during calling.

Fig. 3 describe exemplary time periods during transmission embodiment.Show multiple descending chain circuit frames(From base station to Movement station(It is multiple)Transmission)And uplink frame(From a movement station to the transmission of base station).When each frame includes 4 Gap.Although each time slot on the uplink can include various audio calls and/or data, only show for convenience One such time slot.Adjacent time-slots can use different modulation schemes, and therefore have different capabilities.

When the bandwidth for one or more callings is distributed in base station in a slot, may distribution ratio voice individually need Bandwidth bigger bandwidth.Additional bandwidth can be used for sending end-to-end encryption synchronisation, and end to end security was synchronized usually as generation Frame is stolen for voice(stolen frame)Carried(That is, voice data is deleted and is encrypted synchronous replace).If replaced Generation ground sends end-to-end encryption synchronisation in extra bandwidth, should then can be carried in the case where not stealing any voice messaging End to End Encryption synchronizes, therefore improves transmission quality.The data volume sent in calling increases, this can by lower layer's header or Unique call header uses signal transmission.

Compare audio call since base station can provide in time slot(It is multiple)The bandwidth of required bandwidth bigger, therefore time slot At least some of remainder can be used for transmission data.Although mainly sending number to movement station in a call using time slot Movement station is allowed to receive voice-and-data simultaneously according to this, but data can be sent to other movements for being not engaged in calling It stands.In this case, as time slot prefix(That is, at the beginning of time slot)Lower layer(For example, MAC layer)Ratio is set in header Special or label.Downlink communication equipment notice of the bit/label to such as movement station of scanning time slot etc:In the time slot Also include for having been assigned to the shifting except those of the time slot of a part as quasi- circuit-mode channel movement station The data at dynamic station.Term lower layer refers to layer 1 or layer 2 in osi model.

Similarly, base station can also be somebody's turn to do using at least some of remainder of time slot for being addressed to not use Time slot participates in the signaling of the movement station of calling.Such signaling can be related to other callings on physical channel.In the situation Under, signalling indicator can be used in the MAC header that time slot starts, to indicate that time slot includes to be addressed in time slot to carry just In the signaling for those of call the movement station except movement station, and those of call movement station and so knows that They have been assigned to the time slot of the part as quasi- circuit-mode channel.

In addition, when in identical time slot including multiple callings, each calling can be added using identical or different key Close air interface.If call identifier each calls for identification, it is used as key modifier so that for every Encryption key stream is different for a calling.This can contribute to prevent exterior from attacking downlink information in turn It hits.

If movement station it is expected that transmission data, base station can allow movement station distributing to outside quasi- circuit-mode channel It is managed herein on any free timeslot of the physical channel of data.The biography of the resource in the distribution is only accessed with wherein movement station The circuit-mode channel distribution of system is different, this also allows to be carried out at the same time voice-and-data operation outside the channel of distribution.In movement It stands while participating in the calling on quasi- circuit-mode channel, base station is for example according to the configuration number being stored in system database It, can be to movement station point according to, some ability informations for being exchanged when either being registered according to movement station or by some other modes It is used in the time slot of data transmission.The ability that movement station sent in particular time-slot or received data can depend on movement station Physical parameter, switch such as between reception pattern and emission mode the time it takes or duplexer filter presence or Other parameters.

In figure 3, quasi- circuit-mode channel is shown as the logic letter established on the otherwise physical channel of carrying data Road, and since data can be carried on a control channel, quasi- current mode logic letter can be established in logical control channel Road.In quasi- circuit-mode channel, the mode of voice and/or data in order is transmitted, but can have any predetermined week Phase property, and be not limited to using the identical time slot in every frame.When being assigned with channel and movement station is assigned to the channel, To in the distribution of channel, periodically and the absolute standard for time slot is indicated to movement station, and wherein benchmark indicates the time slot Frame or time-gap number.Benchmark can be used for being used for the first time slot of the channel, or for distributing to the subsequent of the channel Frame and time slot.Each time slot of channel is distributed to come from least one of standard TETRA protocol stacks header(Such as MAC Header)For preamble, this allow the time slot remain able to by using only physical channel for data and currently without being assigned to quasi- electricity The movement station of road mode channel identifies.Quasi- circuit-mode channel is similar with preferred circuit switched data channel, but is not only to cover Voice in lid data frame.In the specific embodiment shown, every 6 time slots are grouped comprising voice and data.It can be seen that phase Different time-gap in adjacent frame(If there is)Including voice and data is grouped.In other words, in circuit-mode call to phase The legacy system that the identical time slot in each frame is distributed with sound or data transmission is different, in the consecutive frame of quasi- circuit-mode call In the time slot for distributing to sound/packet can be different, and transmission collection can not be included in any time slot by particular frame In.For example, in figure 3, since every 6 time slots include sound/data transmission, the pattern that every 3 time slots duplicate:The first, Second time slot of the four, 7th etc. frames is transmitted comprising these, and the 4th time slot of second, the five, 8th etc. frames is transmitted comprising these, And third, the six, 9th etc. frames do not include sound/data transmission.

It sees in isolation, as long as initial frame, time slot and periodicity are all transmitted to movement station, the periodicity of quasi- circuit-mode channel With regard to unrestricted.However, if it is desired that with other quasi- circuit-mode channels or circuit-mode channel, then only specific period be can .It, periodically can be with for example, if the second quasi- circuit-mode channel is added to quasi- circuit-mode channel shown in Fig. 3 It is identical as the periodicity that the first quasi- circuit-mode channel uses(That is, every 6 time slots)Either the first quasi- circuit-mode channel makes Periodic multiple(For example, every 12 time slots), but the time slot to be used with the first quasi- circuit-mode channel(That is, the Two time slots and the 4th time slot)Different time slots start.Alternatively, the second quasi- circuit-mode channel, which can have, is used only the first standard Circuit-mode channel is from not used time slot(That is, the first time slot and third time slot)Any periodicity.

The periodicity of quasi- circuit-mode channel may include or ignore the time slot in the specific signaling frame in multiframe. For example, if the signaling frame of multiframe(Frame 18)It is excluded, then in 6 repeat patterns of the time slot 1 of the TDMA frame 1 of multiframe 1 beginning A time slot will distribute the time slot 3 in frame 2, time slot 1 in frame 4 etc. until the time slot 3 in frame 17.However, more as distributing The replacement of time slot 1 in the frame 1 of frame 2(If 4 time slots of frame 18 are counted into, than 3 late 6 time slots of time slot in frame 17 into Row distribution), next time slot of distribution is the time slot 1 in the frame 2 of multiframe 2.

As a part for call setup instruction, base station provides voice to the movement station for participating in the calling and is packaged instruction.Language Sound is packaged the number that pattern instruction is bundled to the speech frame in a time slot.The number of the speech frame can be that a speech frame arrives The speech frame of any predetermined quantity, such as 2,3,4 or 8.It clear specified speech can be packaged during channel assignment Pattern, and can in the header information in specified time slot repeat the voice be packaged pattern, or can by reference to when Gap carrys out impliedly specified speech periodically through channel assignment and is packaged pattern.For example, using standard TETRA vocoders (vocoder), MS 2 speech frames of every 4 time slots transmission(Therefore, Mean Speed is every 2 time slots, 1 speech frame), therefore in 6 1 time slot in it is periodic distribution can imply that MS sends 3 speech frames in each time slot.Other vocoders can have There is different transmission rates, but can imply according to the mark of vocoder types and periodical this of quasi- circuit-mode channel 's.A large amount of speech frames in each time slot allow longer time slot repeat pattern, and therefore movement station is less believed using physics Road, however, this may also increase due to the needs of the number for accumulating the audio frame from vocoder in real time before rendering Add the audio frequency delay of calling.

In addition in each downlink time slots of quasi- circuit-mode call voice and/or data other than, there is also differences The header of type.Time slot includes overall header at the time slot beginning, for example, MAC header.The header enables movement station will The time slot identification subject to circuit-mode channel a part, and also assure it is compatible with other packet data users of channel, The reason is that the header allows only to need packet data service or is not provided as supporting voice channel point on a data channel The movement station identification time slot matched is assigned to quasi- circuit-mode channel and therefore ignores the content of the time slot, or allows the movement It stands and is identified as the time slot therefore to ignore time slot based on these reasons comprising some form of data for not addressing it Content.In another embodiment, MAC header each of can be assigned in quasi- circuit-mode channel individual calling, to permit Perhaps movement station searches for each protocol Data Unit(PDU)To find other kinds of information.Uplink from movement station passes It is defeated to may not be needed with MAC header, the reason is that, the use of uplink is by base station assigned, and therefore base station is known The movement station that is transmitted and the calling that wherein movement station is being transmitted.However, when in the confirmation of MAC header assistant base station MAC header or MAC header can be applied to can be adapted for detecting another user accidentally on same channel when downlink message The conflict being transmitted.

MAC header(Or each header associated with speech frame below)Can include status indicator, the state instruction Symbol instruction uplink associated with downlink time slots when there is uplink time slot associated with downlink time slots The state of channel time slot.This can indicate that associated uplink time slot is idle or busy.Free time instruction will allow to move It stands and sends random access information and/data while receiving calling on the uplink, this wants to carry out data biography in movement station It is defeated(Such as send AVL data)When be advantageous.Uplink time slot associated with downlink time slots can follow fixation Rule, two time slots more late than downlink time slots such as in absolute time, or with its position determined by Cell Broadcast CB It sets or in the position that calling starts.

It is speech frame after MAC header in time slot.Speech frame may include for each calling each header and The voice of calling.One calling or more than one calling can be assigned to same channel by base station.If time slot will use high speed Rate modulation scheme, such as 16QAM or 64QAM, then compared with supporting the required capacity of individual call, in quasi- circuit-mode channel It is interior that there may be the capacity of bigger.It, should if there are multiple callings, each calling to include unique header in identical time slot Call information of unique header instruction for the calling, which may include following information:It is held in type of call, time slot Whether the number of the speech frame of load has and steals frame, sequence number information when there are multiple speech frames, phase instead of any of speech frame Whether the recipient of prestige, calling are encrypted and the type of codec that is encoded to the voice in calling and for referring to Show the data indicator with the presence or absence of data.

One or more of call header can also identify the content for being designated as " first " and " second " half slot Speech frame allows to transmit same voice frame from the base stations TETRA1 with compatibility mode, in accordance with the TETRA1 rules for being used for transmission frame steathily. One or more of header can include length indicator, which carries multiple callings in identical time slot When, allow movement station to calculate the beginning of latter speech frame according to previous speech frame.It, can for the capacity in call release header The mark for negotiating codec with call establishment stage between the mobile stations and the base stations, without the information is placed in call header In.Therefore, movement station can be decoded call header, and call phase with itself by searching for relevant identifier to search for The information of pass.If desired, then movement station can scan the movement station and be the calling of its member, or ignores the movement station and be not The calling of its member.

Such as show, can only arrange the packet of a set in a slot(Calling 1), this allows to use in a call single A data indicator indicates only calling for including data.It is no except non-mobile station determines that data will exist for it Then when movement station is undesirable searches for the data, the use of data indicator saves the power of movement station.For entire time slot May include a data indicator, and the data indicator can be contained in MAC header or data indicator can Each of to be included in time slot in the call header called.Data can be placed in any point after data indicator. In another embodiment, the first part of time slot is used for the calling with related data(If there is).Therefore, in the embodiment In, the voice transmission in quasi- circuit-mode channel can adjust position according to frame(And when each header identification time slot The use to data indicator can be eliminated when voice transmission in first part).In other embodiments, it can transmit multiple Data acquisition system, in this case, data indicator can include multiple bits, in multiple bit such as indicator data field The position of data for each calling.Alternatively, each data acquisition system can include the header of instruction associated call.

In addition, corresponding time slot(Such as show, when version according to the version 3 of TETRA standards or earlier is delayed by two Gap(But other configurations are possible)To allow the MS without duplex transmitter/receiver to carry out duplex calls)Uplink Link can be assigned to different callings.The different calling can use or can not use quasi- circuit-mode channel, and Can be according to Packet Data Channel and if do not used(Or the control channel of loaded packet data)General Mechanism refer to Another grouped data time slot matched.For example, movement station can be assigned the first half slot or the second half slot or entire physics Subchannel bandwidth in channel:The example of the latter distribution can be that entire physical channel occupies 50kHz, movement station can only by Distribute to the upper 25kHz or lower 25kHz of the channel.Base station can send uplink instruction in corresponding downlink time slots Symbol whether there is data to determine in uplink time slot.If uplink time slot is idle, movement station can transmit number According to for example, to help the movement station in calling to send random access data.Therefore, once base station establishes quasi- circuit-mode letter First time slot and periodicity in road(And this is transmitted to movement station), then because particular time-slot has existed, it is mobile Standing can be to avoid the particular time-slot from base station requests for transmission data.

As above, if movement station it is expected that data are sent or received outside quasi- circuit-mode channel, base station can be to movement Stand assignment its know time slot in the limit of power in movement station.For example, if shown in fig. 3, movement station is participated in frame 1 Calling in 2 time slot 4 of time slot 2 and frame, then movement station can not prevent movement station in 1 time slot 2 of frame and 2 time slot 4 of frame in uplink 2 time slot 2 and 3 of data frame is received in the case of being transmitted in link.Similarly, movement station can not prevent movement station It is received in identified 2 time slot 4 of 1 time slot 2 of frame and frame and transmits number on uplink in 1 time slot 3 and 4 of frame in the case of calling According to.

Fig. 4 depicts one embodiment of the block diagram of the operating method of base station.When movement station it is expected to call, in step At 402, base station receives the request about the calling from movement station.Movement station may include information, channel class such as to be used Type, if in addition there is the data to be transmitted and its maximum data rate being able to maintain that(For example, based on the strong of base station signal Degree).At least some of the information or at least some of the information can be retransmitted whenever movement station request call can be with Be stored in the base station for specific movement station, and for from the movement station for each new calling calling or use In the new calling in predetermined time amount so that base station confirms that maximum data rate/BS signal strengths are not substantially change.

At step 404, base station determines whether there is existing quasi- circuit-mode channel currently in use, and if deposits Then at step 406, determining whether movement station has been supplied audio communication on one or more existing channels.Such as Fruit movement station is receiving other one or more callings, then base station can manage new calling so that new calling in phase Other callings in cochannel are provided together.Even if user monitoring another calling this if allow movement station while to scan All-calls in one time slot.At step 408.Base station determines whether channel can support movement station demand(For example, data Rate), and determine whether the remaining time slots in time slot can be used.When channel can support movement station, at step 410, base It stands and determines that time slot in time slot is available.If there is one or more channels, but movement station is currently without believing The demand for being unsatisfactory for movement station from base station reception data or channel on road or the space without being used for movement station, then in step At 412, base station determines the new quasi- circuit-mode channel not clashed with any existing channel.Whether exist and be used Existing quasi- circuit-mode or circuit-mode channel, no matter and in the presence of movement station whether can use existing quasi- circuit mould One in formula channel, the channel and the time slot in time slot for carrying this voice in step 414, base station distribution, and then, Step 416 place transmits call setup information to movement station.Once base station is assigned with quasi- circuit-mode channel, channel is maintained for standard Perhaps until calling is completed.This eliminates the other channel point to the communication unit signal transmission for participating in calling at regular intervals Match, which is needed in the calling of pure group mode.

It reiterates, quasi- circuit-mode channel has regular time slot pattern, and overlaps the physical channel of carrying data On.Any value may be used in time slot repeat pattern, for example, each time slot, when a time slot in two, one in three Gap, a time slot in four(As current TETRA is used)Deng.Therefore, the quasi- circuit distributed to movement station transmission when base station When mode channel, the time slot being used for transmission not only is indicated, also indicate the periodicity of quasi- circuit-mode channel.Base station is into movement station After slotted mode what will be, and when carry out and how to call it to be transmitted.Similarly, when calling will be by movement station (For example, the member as call service group)When being received on quasi- circuit-mode channel, base station is called to movement station transmission to be started, When will start(Frame and time slot)And periodically.The movement station for being assigned to calling is sent to physics and logic channel, with Voice is sent and received when appropriate.

After the original allocation of the quasi- circuit-mode channel of bearing call, additional channel distribution can also be sent, such as To allow other movement stations to enter calling later.The distribution of these additional channels, which sends latter time slot and is used as, makes movement station that channel be added Starting point, but same period.

It is different from wherein pairs of distribution uplink channel and the legacy system of downlink channel, it can be in uplink With time slot is independently assigned on downlink so that when movement station is when particular time-slot is transmitted to base station, from base station Identical time slot to other members of the group belonging to the movement station being transmitted for for example relaying audio.However, if depositing In multiple movement stations that tool channel with a grain of salt is still being received rather than is transmitted, then this wastes power system capacity.Here, Uplink channel and downlink channel are distributed respectively so that if movement station is in one time slot on uplink to base Station is transmitted, then corresponding time slot will not be assigned to be transmitted to other movement stations on a downlink channel.In addition, Different time-gap repeat pattern can be assigned to the uplink and downlink of the same call of carrying same base.It can be by According to the only one or the two it is expected in assignment uplink or downlink.

When base station receives voice packets from movement station at step 418, at step 420, base station creates or from storage Unique header of the retrieval for the voice packets in storage.If base station further defines at step 422 and is connect from movement station Receiving data and time slot has the space of transmission data, then at step 424, base station by data include in a slot, and The indicator that instruction has the data for receiving calling in a slot for other movement stations is provided in the header for the calling. Then, at step 426, time slot is transmitted in base station to movement station.At step 428, base station transmits according to movement station and determines calling Whether processing is over, and if terminated, new calling is waited for, transmits time slot on quasi- circuit-mode channel on demand.Such as Fruit calling is not over, then at step 430, base station determines whether that movement station retransmits quasi- circuit-mode channel information, and It carries out retransmitting or receiving at step 418 new voice packets data at step 416.It can often repeat about channel point The information matched is called, that is, the situation that evening enters with allowing movement station to enter after calling has begun.

Calling is gone to complete:It is usually complete in movement station if being assigned with circuit-mode channel in conventional systems At some periods after transmission voice packets(Usually several seconds suspension times)Circuit-mode channel keeps being assigned.This Sample supports continuity so that when switching immediately, channel will not be lost, and avoid another movement station and it is expected to the movement station Generated delay when being replied, and therefore have to wait for channel of next control channel arrival please look for novelty.Use the extension The operation for playing the time is referred to as message trunking, and when movement station again access control channel is to continue calling without hanging up when Between operation be referred to as transmission trunking.However, because being transmitted or being occurred without to this any guarantee in no voice packets In the case of channel still maintain assigned, so the use of message trunking and suspension time also wastes power system capacity.

System described here allows to transmit in any available transmission opportunity of the movement station in entire data physical channel Start the request of its answer.These opportunitys can free timeslot present on the uplink in data physical channel(Including this The idle gap of quasi- circuit-mode channel or other quasi- circuit-mode channels)Any position.Because other movement stations is made to pass It send the increase number on the opportunity for starting the request that it is replied to improve rapid system to access again and for the fast of new calling The probability of fast channel distribution, so this allows channel to be deallocated and redistributed immediately(As quasi- circuit-mode channel Or carrying ordinary groups mode data transmission).Base station can retain across multiple uplink time slots on entire physical channel, To assist the request of other movement stations to continue to call;This in message trunking system operatio can the loss of energy some uplink efficiency, But it is that of obtaining downlink efficiency.Similarly, base station can be on any downlink transmission opportunity on entire physical channel Channels distribution is uploaded to call to continue or restart.This avoids the use to suspension time and increase system appearance Amount.Movement station and base station can use entire physical channel in some predetermined times after precedent transmission or end of calling. The predetermined time may be programmed into movement station or can be transmitted by base station.

Fig. 5 depicts one embodiment of the block diagram of the operating method of movement station.At step 502, movement station receives accurate Information is established in circuit-mode channel call, includes the periodicity of start frame and time slot and quasi- circuit-mode channel.In step 504 Place, movement station wait for distributed time slot, movement station to receive the time slot at step 506.Reading entire header and determination Time slot is data channel(With voice packets)Later, movement station reads the first independent call header at step 508.If Movement station determines that call header reaches the voice packets of movement station for being intended at step 510, then at step 512, inspection It looks into determine whether there is the indicator that instruction has the data for movement station.If there is indicator, then in step 514 Place, movement station storage will be from the further part of time slot(And it if it exists, will be from the position in time slot)The number of middle retrieval According to.If the first calling is not intended to reach movement station or indicator is not present, at step 516, movement station determination is It is no to there is any calling to be scanned.If movement station determines there are more callings, at step 518, back to step Before 508 movement stations read next call header, movement station is moved to next call header.

Once having scanned all-calls and storage/reproduction voice packets, at step 520, movement station determines Whether the time slot includes to be intended to reach any data of the movement station.If do not included, movement station, which returns to, waits for quasi- circuit Next time slot of mode channel(Assuming that there is the grouping for being intended to reach movement station without other time slots)Step 504.If number According to presence, then at step 522, movement station determines whether the packet of first set is intended to reach the movement station(For example, logical Cross the position for checking datagram header or data in time slot), and if it is, at step 524 storage or otherwise Use the data.If the packet of first set is not intended to reach movement station, or is intended to reach movement station using After data, at step 526, movement station, which determines, whether there is any packet more gathered in time slot.If there is More set, then at step 528, movement station continues the packet of next set and returns to the number for determining next set Whether it is intended to reach the step 522 of the movement station according to grouping.After having scanned all packets, at step 530, Movement station removes any indicator before returning to waiting for the step 504 of next time slot of quasi- circuit-mode channel.If time slot Middle there are the packets of only one set, then can be omitted the cycle of the formation of step 522,526 and 528 so that movement station is only Data are read at step 524 after the data in determining time slot are intended to reach the movement station.

As described above, although since the poor efficiency of protocol overhead is it is not expected that air interface between the base station and the mobile station It is middle to use ip voice(Or other similar agreements), but it is advantageous that, by the encapsulating voice frames of interface bearing in the air at IP points In group, for by base station to fixed network or by movement station to the equipment for being connected to its data port further transmission, And movement station or base station is set to receive the speech frame being encapsulated in IP, and using being passed in quasi- circuit-mode channel in the air interface Give these speech frames.In other words, IP is not used in view of interface in the air, speech frame is encapsulated in IP to be passed for forward direction It is defeated.Call setup information can carry the information of the IP used outside air interface, and by itself and the phase that is used at air interface It is related to close call identifier, and base station and movement station can re-create other agreements outside IP or air interface point with this Group stream.Sequence number in air interface frame can be used to ensure that the continuity of external protocol.In addition, in some embodiments In, some speech frames can be encapsulated in packet on quasi- circuit-mode channel.

For only in the movement station involved in quasi- circuit-mode channel, at the end of the speech items in calling, in a reality Apply in example, movement station can be allowed to be kept for the short period in quasi- circuit-mode channel, with allow further exchange of signaling or after It is continuous to be called with new session side.However, in various embodiments, movement station can leave channel immediately, and if exhale Continuation is cried, then is assigned new channel(That is, using message trunking).In order to allow quickly to receive the quick extensive of signaling and calling Multiple, movement station can monitor entire data channel for additional signaling in the period after calling or speech items terminate, i.e., Each time slot of physical channel is monitored for the relevant signaling of recovery with calling.This includes that other logics are distributed in monitoring (Quasi- circuit-mode or circuit-mode)The content of other time slots of channel.

If establishing calling using the quasi- circuit-mode channel on physical channel, all movement stations can participate in this way Calling.If cell is added in the movement station that cannot participate in quasi- circuit-mode call, for example, if movement station can only be supported Circuit-mode call on TETRA1 channels, then base station can passed while the calling on retaining quasi- circuit-mode channel Circuit-mode channel of uniting establishes the second calling for the movement station.Alternatively, base station can be by movement station from quasi- circuit-mode Channel assigns to traditional circuit mode channel, therefore the resource in release data channel again.If believed in traditional circuit pattern Calling is established on road and the movement station that cannot be operated on the quasi- circuit-mode channel of data channel leaves, then base station can Quasi- circuit-mode channel is assigned to again will call, to discharge the resource on traditional circuit mode channel.

Although having specifically discussed using 1:The TETRA systems of 4TDMA patterns, but above-described embodiment can be adapted for Other systems.Such technology can provide various different frame repeat patterns;For example, iDEN systems can use it is a variety of different Frame rate and broadcast its present mode to subscriber, and for different types of calling currently used 3:1TDMA and 6: 1TDMA。

In addition, though voice application has been described in the use description of the above alignment circuit mode channel, it is clear that It is that any type of circuit mode data, such as video can be carried on such channel.

In various embodiments, provide the communication between transmitter and receiver in a communications system method and Transmitter and receiver and communication system.In these embodiments, timing includes frame, and each frame includes time slot.In data During the time slot of quasi- circuit-mode channel on channel voice and/or data are transmitted from transmitter to receiver.It is assisted by lower layer Header is discussed to time slot prefixing, which allows the distribution of voice-and-data in time slot, and ensure the time slot with The compatibility that other time slots on data channel use.The information is received by receiver, and receiver determines time slot using header In various information.Note that each method of description has the transmitter and receiver for executing communication function using correlation method.

In various embodiments, disclosed method may be implemented as the computer program used for computer system Product.Such realization may include in such as computer-readable medium(For example, disk, CD-ROM, ROM or fixed disk)Have Fixed series of computation machine instruction, is either connected to network via modem or such as by medium on shape medium Other interface equipments of communication adapter can transmit the series of computation machine instruction of computer system.The medium can be tangible Medium(For example, light or analog communications lines)Or pass through wireless technology(For example, microwave, infrared ray or other transmission technologys)It realizes Medium.The series of computer instructions is realized previously herein with reference to all or part of function of System describe.The technology of this field Personnel will be understood that, can write such meter for a variety of programming languages used by many computer architectures or operating system Calculation machine instructs.In addition, such instruction can be stored in any memory devices, such as semiconductor, magnetic, light or other deposit In storage device, and this can be transmitted using any communication technology of such as light, infrared ray, microwave or other transmission technologys The instruction of sample.It is expected that such computer program product can be distributed as removable medium, there is printing or electronic document(Example Such as, software packaging is compressed), it is preloaded with computer system(For example, on system ROM or fixed disks), or pass through network(Example Such as, internet or WWW)It is distributed from server or electronic bulletin board.Certainly, some embodiments of the present invention can be implemented For software(For example, computer program product)With the combination of both hardware.The other embodiment of the present invention can be completely by hardware Or completely by software(For example, computer program product)It realizes.

It should be understood that terms and expressions used herein are with corresponding each relative to it by those skilled in the art The typical art-recognized meanings of such terms and expressions are given in the investigation and research in region, unless in addition elaborating herein different Specific meaning.The relational terms such as first and second are only used for either acting an entity and another entity or action It distinguishes, without inevitable requirement or implies any actual such relationship between such entity or behavior or suitable Sequence.Term " comprising " or its any other deformation are intended to nonexcludability and include so that process, side including a column element Method, object or device include not only these units, can also include not expressly listed element or this class process, method, object Part or the intrinsic element of device.It is not precluded in the absence of more restrictions including this yuan with the unit that " one " guides There are other identical elements in the process of part, method, object or device.

Those skilled in the art will recognize that the case where not departing from the scope of the present invention of appended claims elaboration Under can to above-described embodiment carry out it is a variety of modification, change and combination, and it is such modification, change and combination be considered and fall into In the range of concept of the present invention.Therefore, the description and the appended drawings are considered illustrative and not restrictive, all this modifications It is to be considered as included in the scope of the present invention.Benefit, advantage for solution to the problem and can make any benefit, excellent Point either solution occur or any one or more elements for becoming more fully apparent be not necessarily to be construed as it is any or complete The key of portion's claim, required either necessary feature or element.By the application and those issued claims All equivalents obtain claim uniquely limit the present invention.

The abstract of the disclosure is provided to allow reader quickly to determine property disclosed in technology.It is for the ease of reason to submit abstract Solution, abstract will not be used to interpret or limit the scope of the claims or meaning.In addition, in foregoing detailed description, it can be seen that In order to simplify disclosed purpose, various features are combined in various embodiments.

Claims (15)

1. a kind of method of communication between the transmitter (200) and receiver (200) of communication system (100), wherein system Timing includes frame, and each frame includes time slot, the method includes:During the time slot of quasi- circuit-mode channel on a data channel Transmit at least one of voice or data, wherein the quasi- circuit-mode channel is the physical channel in bearer data transmission The logic channel of upper foundation, with lower-layer protocols header to the time slot prefixing of the quasi- circuit-mode channel, the lower-layer protocols report Head allows the distribution of voice-and-data in the time slot, and ensures that the time slot makes with other time slots on the data channel Compatibility.
2. according to the method described in claim 1, wherein, the time slot includes multiple callings.
3. according to the method described in claim 2, further including:
Using same key or different key pairs, each calling is encrypted air interface;And
If it is present using the call identifier that each calls of mark as key modifier so that encryption key stream for It is different for each calling.
4. according to the method described in claim 1, wherein, the time slot includes the calling and data for receiver (200), should Receiver (200) is not all involved in any calling in the time slot, and wherein, the letter in the lower-layer protocols header Indicator is enabled to indicate that the time slot includes data.
5. according to the method described in claim 1, wherein, the quasi- circuit-mode channel has periodically, wherein in consecutive frame Identical time slot not by quasi- circuit-mode channel occupancy.
6. according to the method described in claim 1, wherein, the quasi- circuit-mode channel has periodically, wherein more in frame A non-adjacent time slot is by the quasi- circuit-mode channel occupancy.
7. according to the method described in claim 1, wherein, the time slot comprises more than in the time slot for only transmitting voice Bandwidth additional bandwidth, and provide in the additional bandwidth End to End Encryption synchronization.
8. according to the method described in claim 1, wherein, the time slot comprises more than in the time slot for only transmitting voice Bandwidth additional bandwidth, and signaling is provided in the additional bandwidth, the signaling and other callings on physical channel Correlation, and it is addressed to the communication equipment (200) for being not engaged in any calling in the time slot.
9. according to the method described in claim 1, further including:When establishing the quasi- circuit-mode channel, to when participating in described The receiver (200) of calling in gap provides voice and is packaged instruction, and the voice is packaged instruction instruction and is bundled to exhaling in time slot The number of the speech frame cried.
10. according to the method described in claim 1, wherein, the lower-layer protocols header is in downlink time slots, and is wrapped Status indicator containing the state for indicating uplink time slot associated with the downlink time slots.
11. according to the method described in claim 10, further including:When the status indicator indicates that the uplink time slot is empty Idle, the receiver (200) while the calling on the time slot for receiving the downlink, send random access information or At least one of data.
12. according to the method described in claim 1, further including:It is transmitted from the transmitter (200) to the receiver (200) Original allocation, the original allocation include frame, time slot and the quasi- circuit-mode for the initiation for being used for the calling when setting up a call The periodicity of channel.
13. according to the method described in claim 1, further including:
When communication equipment (200) due in the quasi- circuit-mode channel only one calling and with the quasi- circuit-mode channel When associated, after the end of calling, the communication equipment (200) terminates immediately makes the quasi- circuit-mode channel With;And
It is directed in the predetermined period of the communication equipment (200) after the call ends and is previously allocated to the quasi- circuit-mode The time slot of channel reuses relevant signaling to monitor the object for being previously not allocated to the quasi- circuit-mode channel The content for managing the time slot of channel, the time slot for being previously allocated to the quasi- circuit-mode channel is reassigned to:
The initiation of the recovery or different callings of the quasi- circuit-mode channel and the calling on the quasi- circuit-mode channel,
Data circuit mode channel, or
Different quasi- circuit-mode channels.
14. according to the method described in claim 1, further including:If the communication equipment of quasi- circuit-mode call can not be participated in (200) the ongoing calling of the quasi- circuit-mode channel is added, then executes one of following operation:Retaining the standard On circuit-mode channel while ongoing calling, established on circuit-mode channel separately for the communication equipment (200) One calling;And before the calling is added in the communication equipment (200), by the quasi- circuit-mode channel into Capable calling assigns to circuit-mode channel again from the quasi- circuit-mode channel.
15. the receiver (200) in a kind of communication system (100), wherein timing includes frame, and each frame includes time slot, institute It includes receiver circuit (208) to state receiver (200), the quasi- circuit-mode channel of the receiver circuit on a data channel At least one of voice or data are received during time slot, wherein the quasi- circuit-mode channel is in bearer data transmission The logic channel established on physical channel, via the processor of the receiver (200) come with lower-layer protocols header to it is described when Gap prefixing, the lower-layer protocols header allow the distribution of voice-and-data in the time slot, and ensure the time slot with The compatibility of other time slots on the data channel used.
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