CN1260103A - Method for increasing data transmission capacity in a radio network - Google Patents
Method for increasing data transmission capacity in a radio network Download PDFInfo
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- CN1260103A CN1260103A CN98806062A CN98806062A CN1260103A CN 1260103 A CN1260103 A CN 1260103A CN 98806062 A CN98806062 A CN 98806062A CN 98806062 A CN98806062 A CN 98806062A CN 1260103 A CN1260103 A CN 1260103A
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Abstract
The present invention relates generally to radio networks particularly to methods for increasing data transmission capacity in a radio network. In the invention, the capacity of a radio network is increased by utilising any pauses or moments when less transmission capacity is needed in a stream of information (voice or data signal) of a circuit-switched call, i.e. moments when a call is in a discontinuous transmission state (DTX), for transmitting packet data from a base station on the same downlink traffic channel (Radio TCH). When a circuit-switched call switches to a DTX state (transmission of information is interrupted), data (GPRS DATA) of a packet-mode call (calls) is transmitted on the traffic channel allocated for the circuit-switched call, until the discontinuous transmission state ends. A traffic channel can be allocated for packet data transmission (calls) separately in connection with each DTX state, and typically to different mobile stations than the one to which the traffic channel is allocated for circuit-switched transmission. The transmission capacity can thus be allocated effectively to network users that need capacity. The mobile stations may belong to different systems, such as a packet data radio network and a circuit-switched radio network.
Description
The present invention relates generally to wireless network, relate in particular to the method that increases data transmission capacity in the wireless network.
The key constraints of wireless system capacity is limited usable spectrum.Therefore, radio system capacity depends on the radio frequency that can effectively utilize the system of distributing to more.In cellular wireless system, can more effectively utilize radio frequency based on reusing of frequency: same frequency is being used at a distance of a plurality of positions enough far away each other, and this has increased the capacity of system greatly.But it has also increased network and complexity travelling carriage, because travelling carriage must be selected a base station from a plurality of possible base stations.For example, if same frequency is reused in each the 9th sub-district, the spectrum allocation may of N frequency makes and can use N/9 carrier frequency simultaneously in any given sub-district so.The capacity that makes that reduces of the minizone distance of cell sizes or same frequency is increased, but it has also increased the cochannel interference.Therefore, the frequency reuse coefficient determines it often is the compromise of cochannel interference and volume of business.
Fix because distribute to the frequency spectrum of cellular radio, and the number of users growth is very fast, so use the frequency spectrum that distributes all quite important effectively for each Virtual network operator.Therefore, the different attribute that increases traffic carrying capacity in the Cellular Networks is favourable to operator, especially in densely populated urban area.The possibility that wireless network is developed into the high power capacity wireless network is mainly as follows: the quantity, division of cells (sub-district), Microcell, multitiered network, the support-overlay network that increase channel, and other increases the scheme of capacity, for example half-rate channel, frequency hopping and power control.Below we with these possibilities of The effect.
The simplest method of increase capacity is to increase channel quantity.Because it is very limited to distribute to the cellular network frequency spectrum of Virtual network operator, this method can not alleviated capacity problem.The division of sub-district relates to planning problem, the investment that requires the base station to be connected with data.Up to now, the division of sub-district is an a kind of good method of alleviating capacity problem.But unfortunately, the capacity requirement of urban area is very high, and from a long-term perspective, this method is not dealt with problems.Like this, the division of sub-district only provides interim mitigation scheme.In the Microcell scheme, also can run into identical problem.
Support-overlay network comprises two (or a plurality of) different districts layers: a cell layer, and for example macrocell layer provides total covering, and another cell layer, for example microcell level provides capacity.' cover layer ' uses common frequency reuse pattern and cell range that seamless total covering is provided.Frequency reuse pattern that ' capacity layer ' employing is very dense and less cell range realize the high power capacity on some channels.In support-overlay network, the handover between the network layer has very important influence to the capacity that obtains.The another kind of known effective ways that increase the Cellular Networks capacity are to comprise the sub-district that difference is reused the frequency of coefficient.Reusing on the bigger frequency of coefficient, can realize good covering, and reuse on the less frequency of coefficient, can in the middle of the sub-district, realize additional capacity.
In digital mobile system, speech transmissions is fully digitalization.Like this,, can reduce the required bandwidth of wireless connections on the wireless path, thereby realize, promptly 16 or 8kbit/s than the general lower transmission rate of using of 64kbit/s speed in the telephone network by the speech coding in the speech transmissions.Travelling carriage and mobile network all must have the voice codec of coded speech naturally.At network side, the speech coding function can be positioned at a plurality of selectable locations, for example in base station or mobile switching centre.Each that receives or send at travelling carriage comprises the calling of speech, and the speech that voice codec is connected to network side connects, and the voice codec decoding is from the voice signal of travelling carriage reception (up link), and coding sends to the voice signal of travelling carriage (descending).
In some digital mobile systems, speech transmissions also is associated with discontinuous transmission DTX.It is intended to reduce in the following manner the efficient that interference value improves system: when irrelevant information, stop the transmission of wireless signal.In addition, DTX has reduced the power consumption of travelling carriage, and this is for quite important by battery powered portable terminal.The DTX state is the alternative of normal state normally, and mobile network makes one's options between the two at each calling.In the DTX state, when the user spoke, speech generally with for example 13kbit/s coding, at the speech pause, then used much lower bit rate, for example about 500kbit/s.Lower bit rate be used for the encoding information of transmitter side background noise.For example, in pan-European digital mobile system GSM, transmitter (travelling carriage or base station) is general to send the traffic carrying capacity (promptly 96 pulse train/480 millisecond) of a pulse train in a tdma frame, detect silence period section in the voice signal until voice codec.Then, transmitter only sends 12 pulse trains/480 millisecond.At receiver side, for receiving platform regenerate that background noise-Here it is why this noise be called the reason of comfort noise-make user again and can not think that this connection interrupts at the transmission pause.Whether there is the function of any speech behavior to be called the speech behavior again in the transmitting terminal monitoring and detects VAD.Generally whether comprise threshold value according to signal, and the signal energy that relatively records, come decision signal to comprise speech or background noise.
Generating comfort noise is because experience shows, if the background noise of speech back stops suddenly, receives the user so and will be subjected to very big interference.This often runs in discontinuous transmission.A kind of method of avoiding above-mentioned interference is to generate the man made noise when not having received signal.The speech code converter that is positioned at transmitting terminal upgrades characteristics of noise frequently, and sends to receiving terminal.
If the speed or the quantity of data change in calling out, so discontinuous transmission also can be applied to transfer of data.In multichannel high-speed circuit-switched data transmission (HSCSD), the single high-speed data that two or more parallel Traffic Channels (subchannel) are used on the wireless path connects.Such situation may occur: it is much smaller that the speed ratio of information payload data is distributed to the maximal rate of this connection, must send in midair or empty Frame on Traffic Channel.In the given non-continuous data transmission method of PCT/FI96/00669,, only on particular sub-channel, optionally send Frame and alleviate this problem by when not needing to distribute to the maximum transfer capacity of this data connection.Distributing on other subchannels of this connection, do not transmitting at all or the discontinuous transmission fixed with subchannel arranged.The minimizing that enlivens number of sub-channels directly causes the reduction of transmitter power consumption, the minimizing of temperature problem, and the reception of simpler abutting subdistrict, transmission and measurement are regularly.In addition, because reduced transmission unnecessary in the wave point, the interference value in the mobile network also reduces.
In circuit-switched data transmission service,, data call connects (for example Traffic Channel of wave point) for having distributed the special circuit exchange.Like this, Tong Shi number of users is subject to maximum Traffic Channel quantity.In group mode or packet switched data transmission servic, send the individual data grouping according to the address or by the virtual connections of setting up.In wave point, Traffic Channel can be distributed to some users (relaying) to carry out the group mode transfer of data, and this has increased the capacity of the wireless network that records according to number of users.When transfer of data is arbitrarily, connect with under the situation of carrying out rapid data transmission but need to continue maintenance, the group mode data service is particularly favourable.Packet switched data transmission can realize in the packet dedicated wireless network, perhaps realizes as the supplementary service in the circuit common switched wireless network.
Be a new gsm service for the GPRS (GPRS) of pan-European mobile system GSM (global system for mobile communications) exploitation for example, it is one of the standardization problem of the GSM stage 2+ of ETSI (European Telecommunication Standard Institute).The operational environment of GPRS comprises one or more sub-network service areas, and they are interconnected by the GPRS backbone network.Sub-network comprises packet data service node SN, be called service GPRS herein and support node SGSN, each SGSN is connected to GSM mobile network (generally being to be connected to the base station), makes it can pass through several base stations, be the sub-district, provide Packet data service to moving data terminal equipment.Between mobile network supporting to provide the group mode transfer of data between node and the moving data terminal equipment.Different sub-network is then supported node GGSN by specific GPRS gateway, is connected to external data network, for example packet-switch data network PSPDN.By gprs service, can between moving data terminal equipment and external data network, realize packet data transmission, serve as Access Network by the GSM network.Be circuit-switched call and real-time transceiver and the channel that distributes the base station of group mode calling.
The objective of the invention is to increase the data transmission capacity in the wireless network of support circuit-switched and packet-switched transmission business simultaneously.
This purpose realizes that by such wireless system this system comprises travelling carriage and base station network, and wherein each base station while support circuit-switched is called out and the group mode transfer of data, and the discontinuous state that can activate for circuit-switched call on down direction.The invention is characterized in, during the discontinuous transmission state (DTX) of circuit-switched call, for the downlink traffic channel of the base station of ongoing circuit-switched call distribution in the discontinuous transmission state can be distributed to different group mode transfer of data.
The invention still further relates to a kind of data transmission method of wireless system, comprise travelling carriage and base station network, wherein each base station while support circuit-switched is called out and the group mode transfer of data, and it comprises the discontinuous state that can activate for circuit-switched call at least on down direction.This method may further comprise the steps: the base station is a circuit-switched call allocation of downlink Traffic Channel; Set up circuit-switched call; On described downlink traffic channel from described base station transtation mission circuit exchange message; In described circuit-switched call, activate discontinuous transmission state.The method is characterized in that, further comprising the steps of:
During the discontinuous transmission state of circuit-switched call, for the described downlink traffic channel that circuit-switched call in the discontinuous transmission state distributes can be distributed to the group mode transfer of data,
During described discontinuous transmission state, on described downlink traffic channel, send the group mode data;
When described discontinuous transmission state stops, stop the transmission of group mode data on the described downlink traffic channel, downlink traffic channel is returned to circuit-switched call.
The invention still further relates to the wireless system transmission equipment of a kind of while support circuit-switched calling and group mode transfer of data, can activate discontinuous state for circuit-switched call in this system.This equipment is characterised in that during the discontinuous transmission state (DTX) of circuit-switched call, the transmission equipment Traffic Channel with ongoing circuit-switched call in the discontinuous transmission state can be distributed to different group mode transfer of data.
In the present invention, the any pause and the following moment all will be used for sending group mode information on the same downlink traffic channel from the base station: during the less transmission capacity of the information flow of circuit-switched call (speech or data-signal) needs, promptly when calling is in discontinuous transmission state (DTX).When circuit-switched call switches to DTX state (message transmission is interrupted), the group mode packet of calling out sends distributing on the Traffic Channel of this circuit-switched call so, stops until discontinuous transmission state (DTX).Traffic Channel can be distributed to group mode transfer of data (calling) respectively in each DTX, but long-term allocation also is feasible.For example, arranged at least one other downlink traffic channel time spent, and when utilizing the present invention to increase capacity on down direction, long-term allocation is comparatively favourable but call out at group mode.During the DTX state, give certain travelling carriage to carry out the group mode transmission traffic channel assignments, this Traffic Channel also is assigned to another travelling carriage to carry out circuit-switched transfer, and these two travelling carriages generally are not same travelling carriages.Therefore, transmission capacity can optimally be distributed to the network user who needs.Travelling carriage can belong to different system, for example belongs to packet data wireless network and circuit-switched radio network.For Traffic Channel of travelling carriage distribution of group mode transfer of data, control this travelling carriage and on the channel that distributes, receive.It quite normally receives its packet of addressing, but any information of the relevant circuit-switched call of rejection.Correspondingly, the travelling carriage with ongoing circuit-switched call quite normally receives under the DTX state, but refuses all incomplete group mode information.In other words, these two (each) travelling carriages receive on Traffic Channel, have for good and all distributed to this travelling carriage as this channel, and like this, travelling carriage does not need to handle or understand any equipment of other mobile station service amounts.Under simple form, do not need terminal equipment made any change and just can realize the present invention, this makes that the present invention is easier to realize in existing network.Only need to change base station or certain other network element.Also traffic channel assignments can be given same travelling carriage with while transmission circuit exchange and group mode traffic carrying capacity, but must change travelling carriage for this reason.Aspect the network capacity use, compare for a large number of users to carry out the group mode transmission DTX state dynamic assignment with transmit needs according to the user, this allocative efficiency is much lower.An advantage of group mode transfer of data is, can send some user's data in same DTX state, thereby the entire capacity that can more effectively utilize DTX and provided.
Method of the present invention makes that wireless network capacitance obtains more efficiently use on the down direction.Can estimate in the transmission direction that common voice call nearly is being in DTX state (under common call scenarios, the participant is talk in turn, rather than speaks simultaneously) in time of 40 to 50%.Under any circumstance, speech comprises some seconds pause, can send into the data (for example about 500 bytes/0.5 second) of kilobytes in the meantime.Especially on down direction, need all active volumes, because most of data business volume transmits on this direction.Travelling carriage is generally ordered business and the information on the down direction, and receives the data of ordering on down direction, for example world wide web (www) page or leaf or file.
Below, in conjunction with the accompanying drawings, the present invention is described, in the accompanying drawings by preferred embodiment
Fig. 1 shows the GSM/GPRS system architecture;
Fig. 2 A, 2B and 2C show the selectable location of packet control unit PCU;
Fig. 3 is the general diagram according to base station of the present invention;
The flowchart text of Fig. 4 according to the operation of the channel controller 31 of the base station of Fig. 3;
The flowchart text of Fig. 5 the operation of PCU/CCU of Fig. 3;
The signaling diagram of Fig. 6 has illustrated Fig. 3 signal of base station.
The present invention is applicable to the dissimilar of while support circuit-switched and packet-switched transmission business Wireless system. The present invention is particularly useful for pan-European digital mobile system GSM, and (whole world is mobile logical Communication system) with other similar mobile system relevant with general packet radio service gprs, For example DCS1800 and PCS Personal Communications System PCS. Retouch below in conjunction with the GPRS/GSM system State the preferred embodiments of the present invention, but not shoulding be understood to the present invention is confined to any specific nothing Wire system.
Fig. 1 shows the basic architecture of gsm system, and the architecture of the GPRS grouping wireless network of realizing in gsm system.
The basic architecture of gsm system is made up of two parts: base station system BSS and network system NSS.BSS communicates by letter by wireless connections with mobile station MS.In base station system BSS, each sub-district provides service by base station BTS.The base station is connected to base station controller BSC, and BSC has the wireless frequency of control BTS user use and the function of channel.BSC is connected to moving exchanging center MSC.The more detailed description of relevant gsm system is please advised referring to ETSI/GSM, and M.Mouly and M.Pautet show " The GSM System for MobileCommunicatiohs ", Palaiseau, France, 1992, ISBN:2-9507190-07-7.
In gsm system, speech is digitized on circuit switching is connected with transfer of data fully.The speech coding method of using in speech transmissions at present is RPE-LTP (pulse excitation-long-term forecast regularly), and it has adopted long-term and short-term forecast simultaneously.This coding has produced LAR, RPE and LTP parameter, and they replace with speech transmits.Speech transmissions is in 06 chapter discussion of GSM suggestion, and speech coding is discussed in suggestion 06.10.In the near future, also can use other coding method, half rate method for example, the present invention also can use with these methods.Because actual invention is towards the speech coding method of reality, and because the present invention is independent of this method, so no longer go through coding method herein.
Travelling carriage must have the voice encryption device and the decoder of coded speech naturally.Because for the purpose of the present invention, it is unimportant how travelling carriage is realized, and because this realization is the same with general realization, so no longer go through this realization herein.
At network side, different speech codings and rate adaptation function concentrate on code converter/Rate Adapter Unit TRCU.According to the selection that production firm did, TRCU can be positioned at some selectable locations of system.Transcoder unit is 64kbit/s pulse-code modulation pcm interface (an A interface) to the interface of moving exchanging center MSC, is 16 or 8kbit/s GSM interface to the interface of base station BTS.With these interfaces, term uplink and downlink direction also appears in the GSM suggestion, and up direction is the direction from the base station BTS to the moving exchanging center MSC, and down direction is a rightabout.
Transcoder unit TRCU generally is positioned at moving exchanging center MSC, but it also can be the part of base station controller BSC or base station BTS.If transcoder unit TRCU and base station BTS are separated, be positioned at the somewhere separately, the information that transmits between base station BTS and transcoder unit TRCU is trau frame so.Trau frame defines in GSM suggestion 08.60 (perhaps 08.61).According to the content of information, frame can be a speech frame, use/maintenance frame, perhaps Frame, perhaps ' free time ' speech frame.In order to realize that two bytes of each frame comprise 16 synchronization bits synchronously.In addition, first bit of 16 bit words (2 byte) of formation frame is the synchronization check bit.Except comprising actual speech, outside the bit of data or use/maintenance information, all frames all comprise control bit, transmit the information of relevant frame type therein, and other indefinite information fixed with type of quantity.In addition, for example in voice or idle frame, last 4 bit T1-T4 are preserved for above-mentioned timing adjustment.The TRAU speech frame comprises 21 control bit C1-C21, and in addition, last 4 bit T1-T4 of frame are preserved for above-mentioned timing adjustment.Actual voice messaging transmits bit and is positioned at byte 4-38.In fact, the voice messaging that need transmit comprises LAR, RPE and the LTP parameter of RPE-LTP (pulse excitation-long-term forecast regularly) voice coding method.All service bits all are that idle speech frame is similar to the speech frame of Fig. 2 logic ' 1 ' state in frame.Bit C13-C14 forms SID sign indicating number (silence descriptor).Bit C17 shows that down direction can (DTX=1) still cannot (DTX=0) uses the descending DTX bit of discontinuous transmission DTX.Bit C16 shows that trau frame comprises voice (SP=1) in the down direction, or this frame is the SP bit that comprises the SID frame (SP=0) of transmitter side background noise information.
Discontinuous herein transmission DTX refers generally to a kind of like this method: when any pause occurring in speech transmissions (or any out of Memory stream), interrupt the transmission of wireless path usually.In gsm system, descending DTX is realized by 3 main structural elements.In code converter TRCU, need speech behavior detector VAD, check that by it voice signal comprises voice or pure background noise.Under normal delivery status, TRCU sends speech frame (SP=1) and gives the base station.If no longer detect voice, TRCU will calculate the background noise parameter after the required time period so, and beginning sends SID frame (SP=0) to base station BTS.BTS directly sends speech frame to wireless path.When BTS received a SID frame, it sent to wireless path with this frame, and switched to descending DTX state.In DTX, BTS receives the SID frame continuously from code converter TRCU, but only with predetermined space they is sent to wireless path to upgrade noise parameter.DTX continues, and receives speech frame (SP=1) until BTS from code converter TRCU, thereby BTS switches back transmission continuously.
The major advantage of descending DTX is that it has reduced the interference of cellular network, makes travelling carriage can carry out discontinuous transmission.The present inventor is also noted that during the DTX state, and for the physical traffic channels of call distribution does not obtain using, its capacity can be distributed to other downlink transfer.In a preferred embodiment of the invention, other downlink transfer is the GRS packet data transmission.
Further referring to Fig. 1, this gprs system comprises having the GPRS network that two service GPRSs are supported a node (SGSN) and a GPRS gateway support node (GGSN).Different node SGSN of support and GGSN interconnect by the inside backbone network 13 of operator.Should be appreciated that GPRS network can comprise the support and the gateway node of any amount.The GPRS gateway supports node GGSN that operator is connected to the gprs system of other operator of GPRS network, and data network 11-12, backbone network between operator for example, IP network (internet) and net X.25.
Service GPRS supports that node SGSN is the node that service is provided for mobile station MS.Each supports node SGSN to control the packet count business in one or more cell area of honeycomb grouping wireless network.For this reason, each supports node SGSN to be connected to the specific region part of (Gb Interface) GSM mobile system.This connection generally is to lead to base station system BSS, i.e. base station controller BSC (as Fig. 1), perhaps one of base station.Mobile station MS in the sub-district is communicated by letter with base station BTS by wave point, and the support node SGSN that further belongs to its service area by mobile network and this sub-district communicates by letter.In principle, support the mobile network between node SGSN and the mobile station MS only between the two, to transmit grouping.For this reason, mobile network provides physical connection with transmission of data packets between mobile station MS and service support node SGSN.
Support the sub-district of GPRS can be on one or more physical channels distributing radio resource to support the gprs service amount.Physical channel (for example time slot) is called packet data traffic channel PDTCH.It is distributed to a GPRS_MS or one group of GPRS temporarily.In the multi-slot operation, a GPRS_MS can walk abreast and use some PDTCH channels (maximum 8 time slots on same carrier frequency) to transmit the grouping of himself.The physical channel that distributes takes out from the available channel pond of sub-district.According to the capacity requirement principle physical channel is distributed to circuit switching gsm service and gprs service.If distributed a grouping public control channel PCCCH, the required public signaling of GPRS transmits on PCCCH so, perhaps transmits on the GSM public control channel.
GPRS does not also require and for good and all distributes the PDTCH channel.The capacity allocation of GPRS can give the needs of actual packet transmission, is called the capacity requirement principle herein.The advantage of dynamic assignment is, operator can be under overload situations, for the gprs service amount distributes the channel of usefulness not to improve the quality of gprs service.But operator can instruct some channels forever or temporarily to be used for GPRS.
Base station system is connected by Gb Interface with SGSN, and this interface makes that data and signaling information are exchanged.Signaling also comprises the grouped channels assignment signalling, i.e. the foundation of the virtual connections from SGSN to the Radio Resource group that is positioned at base station BTS.This connection also can be that circuit switching connects.
More particularly, Gb Interface is defined by between packet control unit PCU and SGSN.PCU is an operating unit of being responsible for the different agreement of GPRS MAC (Media Access Controlled) and RLC (Radio Link control) layer, the definition in GSM suggestion 03.64 of these agreements.These agreements comprise the structure of the RLC piece that for example is used for downlink transfer, channel access control function (inserting request and insertion authority) and wireless channel management function, for example power control, the distribution of wireless channel and release, broadcasting of control information or the like.
PCU then compiles by the Abis interface channel and is connected to decoding unit CCU.The function channel encoding function of CCU (comprising forward error correction FEC and multiplexing), and wireless channel measurement function.CCU also generates the GPRS piece, i.e. GPRS grouping, and data and signaling information transmit in grouping by wave point.Shown in Fig. 2 A-C, CCU always is positioned at base station BTS, but PCU has a plurality of selectable locations: base station BTS (Fig. 2 A), base station controller BSC (Fig. 2 B) is perhaps supported node SGSN (Fig. 2 C).If PCU separates with BTS, be positioned at the somewhere separately, CCU can control some control of PCU so.
The present invention can be applied to all selectable locations of PCU.But with regard to the use of wireless path, the simplest and the most effective realization is that PCU is positioned at the base station.Fig. 3 shows base station BTS of the present invention, comprises PCU/CCU unit (PCU of combination and CCU), gsm service channel controller 31 and radio-cell 30.
The GSM channel controller generally is illustrated in before the transmission, the base band signal process of base station BTS to carrying out on the downstream signal: for example, and chnnel coding, multiplexing etc.To most important function of the present invention is the control of descending DTX.Channel controller 31 connects (Abis interface) in numeral and upward receives descending gsm service amount from base station controller.The gsm service amount comprises trau frame, and it is that channel controller 31 is handled, and sends to radio-cell 30 with the form of wave point frame by circuit 32.Channel controller 31 carries out the Base-Band Processing of 8 gsm service channels.In addition, channel controller 31 is equipped with according to additional function of the present invention: it is by beginning and the end of DTX_DETECTED line indicating downlink DTX.Each gsm service channel has special-purpose DTX_DETECTED line and industrial siding 32.
PCU/CCU comprises the combination function of PCU and CCU.PCU/CCU connects 35 (Gb Interface) by numeral and receives the gprs service amount.Connect 35 and can or be derived from other route of supporting node SGSN by base station controller BSC.PCU/CCU is connected to radio-cell 30 by circuit 33, and it uses for GPRS from radio-cell 30 distribution service channels.Each Traffic Channel all has an independent circuit 33.In addition, PCU has according to bells and whistles of the present invention: it can will distribute to circuit switching GSM call out, but the traffic channel assignments that is in the DTX state at present is to the gprs service amount.
The radio frequency part of radio-cell 30 general expression radio-frequency channels, and the base band signal process directly related with it.Because a radio-frequency channel comprises 8 time slots (GSM), therefore, the capacity of radio-cell 30 is 8 Traffic Channels.These Traffic Channels can be distributed to gsm service amount or gprs service amount in real time.In addition, radio-cell 30 has according to bells and whistles of the present invention: if corresponding DTX_DETECTED line set, it sends the GPRS information that obtains from PCU/CCU on the Traffic Channel of distributing to circuit switching GSM calling so.
Below, we investigate operation according to base station BTS of the present invention by example.
Let us supposes that at first setting up process according to the normal call of gsm system has set up circuit switching GSM voice call, and the Traffic Channel ch4 that has been this call distribution.GSM channel controller 31 receives voice and SID frame according to Fig. 6 from circuit 34, handles these frames according to the needs of GSM.In addition, channel controller 31 is finished the function according to Fig. 4 block diagram on each channel.At first, at frame 41, control unit 31 checks whether the frame that receives from circuit 34 is the SID frame.If not the SID frame, process proceeds to frame 44, wherein safeguards or set up continuous transmission state.After this, zero clearing DTX_DETECTED line (deactivation).In the example of Fig. 6, correct 3 frames are carried out frame 44 and 45.If the frame that receives from circuit 34 in the parts 31 is the SID frame, channel controller 31 switches to descending DTX state in frame 41 so.After switching to the DTX state, channel controller still sends a SID frame to radio-cell 30.After this, the DTX_DETECTED line of this Traffic Channel of channel controller 31 set (activation), as shown in Figure 6.
Up to now, radio-cell 30 has sent GSM information, and promptly 3 speech frames and a SID frame are on Traffic Channel ch4, because be cleared corresponding to the DTX_DETECTED line of this Traffic Channel.If the DTX_DETECTED line is set, radio-cell 30 beginnings send the GPRS information that receives from circuit 33 on Traffic Channel ch4 so.
Flow chart referring to Fig. 5, if PCU/CCU detects the DTX_DETECTED line of Traffic Channel and is set (frame 51), it is that one or more GPRS_MS (more if desired downlink transfer capacity) temporarily are distributed into gprs service channel PDTCH (frame 52) with this Traffic Channel so.Under the GPRS ready state, PCU sends according to the GPRS process that grouping resources is assigned or assignment messages (frame 53) again, starts the transmission of grouped data to mobile station MS.If MS is not under the GPRS ready state, so at first finish signaling according to GPRS suggestion to activate ready state.Because the purpose of this invention is to provide additional capacity, so MS is positioned at ready state (even receiving) probably on one or more other Traffic Channels.If the sub-district comprises the PCCCH of a distribution, then on PAGH, send the grouping resources assignment messages.If the sub-district does not comprise the PCCCH of a distribution, then on AGCH, send the grouping resources assignment messages.The grouping resources assignment messages comprises that the packet traffic channel PDTCH that is used for downlink transfer (: channel ch4) and be used to carry the inventory of the PDTCH of up PACCH herein.If possible, also relate to the control of timing advance and power.Otherwise, can require the MS response by inserting pulse.After this, PCU/CCU begins to present the GPRS grouped data by circuit 33 (frame 54) to radio-cell 30.Radio-cell 30 is transmitted the GPRS data by wireless path on down channel ch4, as shown in Figure 6.Utilize the identifier that comprises in each radio block, the radio block of addressing different mobile stations MS can be multiplexed into same PDTCH.In transfer of data, can adopt selective acknowledgement.Like this, PCU can require (poll) MS to send grouping Ack/Nack on up direction.
PCU/CCU continues to send the GPRS data, detects (frame 55) DTX_DETECTED line until it and is cleared.(Fig. 6) in this example, when channel controller 31 received first speech frame under the DTX state, this channel controller switched to continuous transmission state, and zero clearing DTX_DETECTED line.Channel controller 31 restarts the forwarding of speech frame.Because the DTX_DETECTED line is cleared, radio-cell 30 switches to Traffic Channel ch4 to send the GSM information that obtains from channel controller 31.
If PCU/CCU detects the DTX_DETECTED line and is cleared in frame 55, it stops to transmit the GPRS grouping to radio-cell 30.In addition, PCU/CCU discharges the distribution of Traffic Channel ch4 as gprs service channel PDTCH according to the GPRS process.The release of resource is started by PCU, and it stops descending transmission, the final affirmation of request MS.When the downlink transfer on the PDTCH finished, the MS commentaries on classics removed to monitor PCCCH, thereby when needed, can send a grouping resources assignment messages, distributed a new PDTCH to give it.PCU also can redistribute current descending PDTCH by sending the grouping resources assignment messages, and aforementioned messages is added their confirmation by MS.For example, it is feasible being reassigned into another gsm service channel under the DTX state.
In a preferred embodiment of the invention, GPRS distributes only lasting DTX state.GPRS distributes also can continue longer a period of time, promptly some DTX states.Like this, the grouping resources assignment messages only need send at a DTX beginning, promptly before transfer of data begins.In following DTX state, transfer of data can directly begin, and without any need for signaling.Long-term allocation is for example comparatively favourable under for the situation that additional capacity is provided in the transfer of data of carrying out on one or more other Traffic Channels in the present invention.Traffic carrying capacity controller 31 also can zero clearing DTX_DETECTED line, sends the SID frame with predetermined space under the DTX state.This may cause each SID to upgrade frame (about 0.5 second) GPRS distribution afterwards.If PCU/CCU waits for that the time of at least one frame is to guarantee that carrying out the SID renewal still is the startup voice transfer, so just can avoid this problem.If being SID, it upgrades, zero clearing DTX_DETECTED line then, and PCU/CCU can continue the transmission of same distribution.
GSM_MS can receive the GPRS data, but it refuses incomplete data.Therefore, the present invention does not need any change of terminal equipment.
In an embodiment of the present invention, channel controller 31 and PCU/CCU are connected to radio-cell 30 by public time division multiplexing bus.On this bus, a time slot is corresponding to a Traffic Channel.Radio-cell 30 reads the content of time slot from bus, on this Traffic Channel with its forwarding.If channel controller 31 is write bus under continuous transmission state, then PCU/CCU is positioned at the DTX state, and conflict takes place.In this embodiment, the DTX_DETECTED line does not need to be connected to radio-cell 30.
More than by example the present invention has been described, voice codec, VAD and DTX function are positioned at the transcoder unit that separates with base station BTS in this embodiment.Voice codec and DTX function also can be positioned at the base station naturally, thereby can directly obtain the DTX state information, and do not need to discern the SID frame.Even if be not that so the present invention also can be applied to the base station of any kind, and any other transmission equipment that during the DTX of circuit-switched call state, sends group mode information.
Abovely described the present invention, but the present invention also can be applied to the DTX of data call in conjunction with voice call.For example, in PCT/FI95/00669, in the disclosed multichannel transmission, on the channel of certain distribution, do not need the transmission of any kind, the discontinuous transmission fixed with subchannel perhaps arranged.In the present invention, this ' poor efficiency use ' Traffic Channel can be served as the additional capacity of GPRS transfer of data.
Should be appreciated that figure and associated description only are used to illustrate the present invention.Details of the present invention can change in the scope and spirit of appended claim book to some extent.
Claims (20)
1. a wireless system system comprises
Travelling carriage (MS),
Base station network, wherein each base station (BTS) simultaneously support circuit-switched call out and the group mode transfer of data, and
The discontinuous state that can on down direction, activate for circuit-switched call,
It is characterized in that,
During the discontinuous transmission state (DTX) of circuit-switched call, for the downlink traffic channel of the base station of ongoing circuit-switched call distribution in the discontinuous transmission state can be distributed to different group mode transfer of data.
2. according to the wireless system of claim 1, it is characterized in that, comprise unit (PCU), be used to the group mode transfer of data to distribute Radio Resource, if the group mode transfer of data needs additional capacity on the down direction, then this unit distributes the downlink traffic channel of the circuit-switched call that is in the DTX state at present to be used for the group mode transfer of data.
3. according to the wireless system of claim 1 or 2, it is characterized in that, circuit-switched call is an audio call, this system also comprises and the far apart speech code converter (TRCU) in base station (BTS), whether speech code converter basis has voice, send speech parameter frame or noise parameter frame to base station (BTS), base station (BTS) is in response to the reception of noise parameter frame, on downlink traffic channel, start descending DTX state, activate the DTX detection signal, the reception of base station in response speech frame under the DTX state stops descending DTX state on downlink traffic channel, deactivation DTX detection signal, this wireless system also comprises unit (PCU), be used to the group mode transfer of data to distribute Radio Resource, this cell response is in the DTX detection signal that activates, and the allocation of downlink Traffic Channel is used for the group mode transfer of data during the DTX state at least.
4. according to claim 1,2 or 3 wireless system, it is characterized in that the group mode transfer of data is the packet data transmission according to gprs system.
5. according to the wireless system of claim 4, it is characterized in that described wireless resource allocation unit comprises the packet control unit (PCU) of gprs system.
6. according to claim 1,2,3,4 or 5 wireless system, it is characterized in that circuit-switched call is the calling of GSM mobile system.
7. a kind of data transmission method of wireless system, comprise travelling carriage (MS) and base station network, wherein each base station (BTS) simultaneously support circuit-switched call out and the group mode transfer of data, it comprises the discontinuous state that can activate for circuit-switched call at least on down direction, this method may further comprise the steps:
(BTS) is circuit-switched call allocation of downlink Traffic Channel in the base station;
Set up circuit-switched call;
On described downlink traffic channel from described base station (BTS) transtation mission circuit exchange message;
In described circuit-switched call, activate discontinuous transmission state,
It is characterized in that, further comprising the steps of:
During the discontinuous transmission state of circuit-switched call, for the described downlink traffic channel that circuit-switched call in the discontinuous transmission state distributes can also be distributed to the group mode transfer of data,
During described discontinuous transmission state, on described downlink traffic channel, send the group mode data;
When described discontinuous transmission state stops, stop the transmission of group mode data on the described downlink traffic channel, downlink traffic channel is returned to circuit-switched call.
8. according to the method for claim 7, it is characterized in that,
During each discontinuous transmission state, for the group mode transfer of data is distributed a downlink traffic channel separately,
Before starting the group mode transfer of data,, respectively distribution is informed grouped data terminal equipment by signaling at the beginning of each discontinuous transmission state.
9. according to the method for claim 7, it is characterized in that,
During some discontinuous transmission states, for the group mode transfer of data is distributed a downlink traffic channel,
Before starting the group mode transfer of data,, grouped data terminal equipment is informed in distribution by signaling at the beginning of the first discontinuous transmission state.
When transmission state began continuously, the transmission of group mode data was returned to circuit-switched call with Traffic Channel on the interrupting service channel,
At the beginning of each follow-up discontinuous transmission state, restart the group mode transfer of data immediately.
10. according to claim 7,8 or 9 method, it is characterized in that circuit-switched call is a voice call, this method may further comprise the steps:
According to whether voice are arranged, from sending speech parameter frame or noise parameter frame to base station (BTS) with base station (BTS) far apart speech code converter (TRCU),
If receive the noise parameter frame, base station (BTS) starts descending DTX state on downlink traffic channel, activates the DTX detection signal,
If the base station receives speech frame under the DTX state, then on downlink traffic channel, stop descending DTX state, deactivation DTX detection signal, and
The unit that distributes Radio Resource for the group mode transfer of data at least during the DTX state allocation of downlink Traffic Channel be used for the group mode transfer of data, this distribution is different from the allocation of radio resources of carrying out for circuit-switched call; On Traffic Channel, show discontinuous transmission state in the information flow of circuit-switched call,
Distribute a downlink traffic channel for the group mode transfer of data is temporary transient,
Any pause in the indicating circuit switched call transmission,
Described pause in transmission sends group mode information.
11. the wireless system according to any in the claim 7 to 10 is characterized in that, the group mode transfer of data is the transfer of data of gprs system.
12. the wireless system according to claim 11 is characterized in that, according to the process of gprs system, for the group mode transfer of data is distributed a down channel, and by signaling grouped data terminal equipment is informed in distribution.
13. the wireless system according to any in the claim 7 to 12 is characterized in that,
Process according to the GSM mobile system is set up circuit-switched call, carries out discontinuous transmission.
14. simultaneously support circuit-switched is called out and the transmission equipment of the wireless system of group mode transfer of data, can be in this system for circuit-switched call activate discontinuous state,
It is characterized in that,
During the discontinuous transmission state (DTX) of circuit-switched call, transmission equipment (BTS) Traffic Channel with ongoing circuit-switched call in the discontinuous transmission state can be distributed to different group mode transfer of data.
15. the transmission equipment according to claim 14 is characterized in that, transmission equipment is base station (BTS), can activate discontinuous transmission on downlink traffic channel.
16. transmission equipment according to claim 15, it is characterized in that, base station (BTS) comprises unit (PCU/CCU), be used to the group mode transfer of data to distribute Radio Resource, if the group mode transfer of data needs additional capacity on the down direction, then this unit distributes the downlink traffic channel of the circuit-switched call that is in the DTX state to be used for the group mode transfer of data.
17. transmission equipment according to claim 15 or 16, it is characterized in that, circuit-switched call is a voice call, base station (BTS) is from receiving speech parameter frame or noise parameter frame with the far apart speech code converter (TRCU) in base station to base station (BTS), whether speech code converter basis has voice, send speech parameter frame or noise parameter frame to base station (BTS), base station (BTS) is in response to the reception of noise parameter frame, on downlink traffic channel, start descending DTX state, activate the DTX detection signal, base station (BTS) is in response to the reception of speech frame under the DTX state, on downlink traffic channel, stop descending DTX state, deactivation DTX detection signal, and base station (BTS) comprises unit (PCU/CCU), be used to the group mode transfer of data to distribute Radio Resource, this cell response is in the DTX detection signal that activates, and the allocation of downlink channel is used for the group mode transfer of data during the DTX state at least.
18. the transmission equipment according to any in the claim 14 to 17 is characterized in that, the group mode transfer of data is the transmitted in packets of gprs system.
19. the transmission equipment according to claim 18 is characterized in that, described wireless resource allocation unit comprises the packet control unit (PCU) of gprs system.
20. the transmission equipment according to any in the claim 14 to 19 is characterized in that,
Circuit-switched call is the calling of GSM mobile system.
Applications Claiming Priority (2)
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| FI972461A FI105306B (en) | 1997-06-10 | 1997-06-10 | Radio |
| FI972461 | 1997-06-10 |
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| CN1260103A true CN1260103A (en) | 2000-07-12 |
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| CN98806062A Pending CN1260103A (en) | 1997-06-10 | 1998-06-09 | Method for increasing data transmission capacity in a radio network |
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| EP (1) | EP0983700A2 (en) |
| JP (1) | JP2002507342A (en) |
| CN (1) | CN1260103A (en) |
| AU (1) | AU7768498A (en) |
| FI (1) | FI105306B (en) |
| TW (1) | TW348350B (en) |
| WO (1) | WO1998057509A2 (en) |
| ZA (1) | ZA984927B (en) |
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- 1998-06-09 CN CN98806062A patent/CN1260103A/en active Pending
- 1998-06-09 JP JP50168399A patent/JP2002507342A/en active Pending
- 1998-06-09 AU AU77684/98A patent/AU7768498A/en not_active Abandoned
- 1998-06-09 EP EP98925661A patent/EP0983700A2/en not_active Withdrawn
- 1998-06-09 WO PCT/FI1998/000497 patent/WO1998057509A2/en not_active Application Discontinuation
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| CN101507201B (en) * | 2006-08-22 | 2013-12-18 | 高通股份有限公司 | Semi-persistent scheduling for traffic spurts in wireless communication |
| CN101360286B (en) * | 2007-07-31 | 2012-12-19 | 中兴通讯股份有限公司 | Voice frame transmission system and method |
| CN101360266B (en) * | 2007-08-03 | 2013-01-30 | 中国移动通信集团公司 | Base station transceiver, mobile communication network and transmission method for data service |
| WO2011009379A1 (en) * | 2009-07-20 | 2011-01-27 | 中国移动通信集团北京有限公司 | Method, apparatus and wireless communication system for controlling downlink discontinuous transmission state |
Also Published As
| Publication number | Publication date |
|---|---|
| TW348350B (en) | 1998-12-21 |
| JP2002507342A (en) | 2002-03-05 |
| FI105306B (en) | 2000-07-14 |
| EP0983700A2 (en) | 2000-03-08 |
| AU7768498A (en) | 1998-12-30 |
| FI972461A0 (en) | 1997-06-10 |
| ZA984927B (en) | 1999-01-04 |
| FI972461A (en) | 1998-12-11 |
| WO1998057509A3 (en) | 1999-03-04 |
| WO1998057509A2 (en) | 1998-12-17 |
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