CN1977493B - Method and system for providing access to a channel for voice transmissions - Google Patents
Method and system for providing access to a channel for voice transmissions Download PDFInfo
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- CN1977493B CN1977493B CN2005800217667A CN200580021766A CN1977493B CN 1977493 B CN1977493 B CN 1977493B CN 2005800217667 A CN2005800217667 A CN 2005800217667A CN 200580021766 A CN200580021766 A CN 200580021766A CN 1977493 B CN1977493 B CN 1977493B
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Abstract
In a TDMA system, a plurality of subscriber units (SU; 12, 14, 22) and a plurality of base radios (BR; 5, 7, 13) provide access to a channel for voice transmissions. A SU requests a voice transmission by pressing 'push to talk' on a mobile unit (202). The SU then determines whether the voice transmissions is provisioned for 'polite' channel access (216). If the 'polite' channel access specifies that the SU be 'polite' to all (216), then the SU sends negative feedback to the SU user (220). Alternatively, if the 'polite' channel access specifies that the SU not be 'polite' to all (218), but be 'polite' to its own color code (218), then the SU performs time slot synchronization with the BR.
Description
Technical field
The present invention relates generally to a kind of wireless communication system, and relate more specifically to the voice transfer in time division multiple access (TDMA) system.
Background technology
Wireless communication system can comprise one group " subscriber unit " usually; Subscriber unit is the terminal point of communication path normally; And comprise one group " radio station, base station ", the radio station, base station normally static and be intermediary, can set up or remain to the communication path of subscriber unit (SU) through this radio station, base station.The system of a above-mentioned type is time division multiple access (TDMA) communication system, and wherein wireless medium is divided into the communication of a plurality of time slots with transfer system.Because wireless medium is common media, therefore need manages and need to allow SU use this wireless medium for voice communication the visit of wireless medium.
Particularly, for the SU that transmits, SU must at first activate radio station, base station (BR) and obtain synchronously.In case obtained synchronously, then SU requires to set up and calls out, and on wireless medium, sends subsequently.Owing to activating BR and being necessary synchronously, therefore need the extra time set up calling.Thus, these processes are avoided in expectation, call out the needed time thereby reduce to set up.In addition, have such a case, promptly during the environment of activate calling out, thereby specific SU need carry out priority access and need give this SU the access right of wireless medium is transmitted to wireless medium.
Thus, exist for voice communication the needs to the visit of channel are provided.
Summary of the invention
According to an aspect of the present invention; Provide in a kind of wireless communication system; Said wireless communication system comprises a plurality of subscriber units and radio station, a plurality of base station; A kind of permission first subscriber unit is voice transfer and the method for access channel; Said method comprises the steps: to confirm that first subscriber unit is defined as the visit to the courtesy of channel, and wherein said first subscriber unit is in the type of considering before the current communication of on channel, carrying out for its own communication access channel, and wherein said first subscriber unit is characterised in that first colour coding and first ID of conversation group; For from the voice transfer of second subscriber unit and channel is detected, wherein said second subscriber unit has the secondary color code and second ID of conversation group; And if first ID of conversation group and second ID of conversation group be complementary, even then channel is used for voice transfer by second subscriber unit, also allow first subscriber unit for voice transfer access channel.
According to another aspect of the present invention; Provide in a kind of wireless communication system; Said wireless communication system comprises a plurality of subscriber units and radio station, a plurality of base station, and a kind of permission first subscriber unit is voice transfer and the method for access channel, and said method comprises the steps:
Confirm that said first subscriber unit is defined as the visit to the courtesy of channel; Wherein said first subscriber unit is considered the type of the current communication of on channel, carrying out before for its oneself communication access channel, and wherein said first subscriber unit is characterised in that first colour coding;
For from the voice transfer of second subscriber unit and channel is detected, wherein said second subscriber unit has secondary color code; And
If said first colour coding and said secondary color code do not match,, also allow said first subscriber unit to visit said channel for voice transfer even then said channel is used for voice transfer by said second subscriber unit.
Description of drawings
Now, will only come by way of example the preferred embodiments of the present invention are described with reference to accompanying drawing, wherein:
Fig. 1 shows the block diagram according to the example wireless communication system of the embodiment of the invention.
Fig. 2 shows the flow chart that voice transfer is provided the exemplary method of channel access.
Fig. 3 shows the continuity of example shown in Figure 2.
Fig. 4 shows the further continuity of the example shown in Fig. 2 and 3.
To be appreciated that simple and clear in order to make accompanying drawing, each parts shown in the figure not necessarily are drawn to scale.For example, the size of some parts relative to each other has been exaggerated.In addition, thinking appropriate place, use the reference number of repetition to represent identical parts in the accompanying drawings.
Embodiment
With reference now to Fig. 1,, when using example of the present invention and being integrated into it in wireless communication system commonly used 100, shows the example of method and apparatus of the present invention.Shown example comprise a plurality of sub-districts, its each all have the radio station, base station (BR) 3,5,7,9,11,13 that is usually located at said center of housing estate, and a plurality of subscriber unit 12,14,16,18,20,22.Subscriber unit 12,14,16,18,20,22 utilizes radio station, base station 3,5,7,9,11,13 transmission and received communications.
Subscriber unit (SU) preferably includes removable or portable set (such as vehicle-mounted or hand-held radio telephone or radio telephone); Said removable or portable set can use above-mentioned time division multiple access (TDMA) or time division duplex (TDD) technology to communicate with BR; Wherein certain period of time is divided into a plurality of time slots, and said a plurality of time slots distribute for each communication.In exemplary embodiment of the present invention; Wireless communication system 100 adopts the tdma communication system of two time slots; Yet, can in the tdma communication system, use other time slot ratio, and this still belongs to spirit of the present invention and falls within protection scope of the present invention.In the exemplary embodiment, SU utilizes and pushes PTT (PTT push to talk) beginning voice communication, and it will send to BR for the request of wireless medium.
BR preferably includes permanent plant, and this permanent plant is used for transmitting data/control and voice messaging to SU, and is used for transmitting data/control and voice messaging from SU, in order in wireless communication system 100, to promote the communication between each SU.Illustrative example of the present invention comprises BR, this BR judge do not have effective SU activity on wireless medium after (closing) (dekey) 5 seconds.In the exemplary embodiment, such timer is called as the user and closes timer (SIT).In the above-described embodiments, after not having effective SU activity in confirming two time slots of tdma communication system any one, said SIT closed 5 seconds.When on said wireless medium, not existing effective SU movable, start SIT, and when BR confirms on said wireless medium, to exist effective SU movable, stop this SIT.In another illustrative example, wireless communication system 100 is included in 180 seconds BR that also close afterwards.In BR, stipulate the above-mentioned time cycle and be referred to as overtime timer (TOT).When on wireless medium, detecting new SU transmission, TOT is resetted.When BR closes owing to SIT is overtime, stop TOT, and BR closes when TOT expires, wherein the expiration of TOT will finish any communication of well afoot.
The communication of being initiated or being repeated and be sent out to subscriber unit (SU) by BR is defined as down link, and the communication of being initiated and being sent out to BR by SU is defined as up link.In the exemplary embodiment, each BR 3,5,7,9,11,13 can not send down link continuously, but each BR keeps synchronous communication so that a plurality of time slots that between BR and SU, send keep synchronous based on the BR down link.
In illustrative example, the message at the center through identification TDMA burst provides synchronous.In SU or BR, receiver uses matched filter and correlator DO symbol to recover and to the happen suddenly identification at center of TDMA.In case said receiver and channel synchronization, then receiver uses pattern matching to detect whether there is such message, and whether the clear channel of said message table exists and be synchronized.The wheel synchronization type that exists on the clear channel of said message table.In illustrative embodiment, said message is used for distinguishing: a) voice bursts and data/control burst, and be used to distinguish voice bursts and backward channel burst; B) inbound channel and departures channel; C) modulation type on the channel, for example Motorola P25Phase 1 FDMA and Motorola P25Phase 2 TDMA; And d) type of wireless communication system, for example Motorola P25system and Motorola Low Tier Digital system.
As here use, term " communication " and " transmission " can be exchanged use, and refer to the continuous T DMA burst of in a time slot, sending from a radio station.Thereby transmission is often referred to: voice, data or the control information relevant with wireless communication system 100.Term " calling " is meant the related voice transmission between each SU in wireless communication system 100.In the exemplary embodiment, the voice transfer in the calling was separated by free time, and wherein said free time is to be announced by the message of notifying the user radio medium to be in idle condition.In addition, owing to free time on up link, occurred, therefore on down link, send the idle message of said notice user radio medium.
As be well known in the art, term " burst " refers to the smallest standalone unit of TDMA transmission.In illustrative example, for the burst that in Motorola Low Tier Digital system, occurs, defined transmission is 216 payload and 48 synchronous or embedding signaling.Defined transmission needs 27.5 milliseconds sends, and all has 1.25 milliseconds guard time in the both sides of actual transmissions.Thus, " burst " in above-mentioned Motorola Low TierDigital system is 30 milliseconds.
Visiting wireless medium (also being called as " channel " in the prior art) for voice communication before, SU will consider the pattern of the voice communication needs of being asked.For example, SU can send voice communication with repeater mode or intercommunication (intercommunication) pattern.If the voice communication of being asked needs repeater mode, then SU requires BR to accomplish voice communication.In illustrative embodiment, repeater mode is defined as a kind of like this SU voice transfer, and wherein said SU sends with uplink frequency and BR is arrived in the RR energy emission.BR is transformed to down-link frequencies with voice transfer subsequently, and radiates RF energy to target SU.If the voice communication of being asked needs the intercommunication pattern, then SU does not require that BR accomplishes voice communication.In illustrative embodiment, the intercommunication pattern is defined as a kind of like this SU voice transfer, and wherein SU sends and radiate RF energy to target SU with down-link frequencies.As be well known in the art, the intercommunication pattern also is called as Direct Model, and it is characterized in that: the SU voice transfer is that SU sends with down-link frequencies and need not the auxiliary of BR.
In illustrative example, SU or BR can radiation RF energy, and wherein said radiation is meant on channel sends.In addition, the communication between SU and the BR can be voice or data/control.Thus, on channel, there is four types communication: SU source voice, SU source data (/ control), BR source voice and BR source data (/ control).In order to make the receiver among SU or the BR know the communication of having sent which kind of type, and for receiver is handled said communication rightly, communication comprises the frame alignment word of 48 bits (24 symbol), in order to discern the type of said communication.
Before for voice communication channel being conducted interviews, SU will consider the predetermined characteristic of SU.The predetermined characteristic of SU is programmed attribute or the characteristic how indication SU operates.In illustrative example, the user who is developed by motorola inc stipulates that software (CPS) (also claiming wireless traffic software (RSS)) is used for the characteristic of SU specified.For example, SU can conduct interviews to channel according to " courtesy " predetermined characteristic, and wherein " courtesy " were meant before for the communication access channel of SU oneself to consider which kind of communication type of current existence on the channel earlier.In the exemplary embodiment, " courtesy " are subdivided into voice communications all on the channel " courtesy ", and only on the channel from other voice communications " courtesy " of other SU with same color.All " courtesy " SU are meant that SU is to any detected channel activity " courtesy ".
If SU is not " courtesy ", then it has the predetermined characteristic of " impoliteness ", and wherein " impoliteness " is meant that SU is not in that at first whether effectively and just begin transmission under the unimpeded situation authenticated channel.In the exemplary embodiment, " promptly " communication is the communication of a kind of " impoliteness ".
As be well known in the art, " colour coding " is by the one group of public identifier that the SU group is used that utilizes identical BR.For example, as shown in Figure 1, because SU 12,14,22 used identical BR, i.e. BR9, so they have same colour coding.In addition, the colour coding field may reside in the signaling message and common data burst of embedding, in order to provide a kind of wireless network or given trunk device is carried out method for addressing, disturbs thereby can get rid of cochannel.Known in the prior art in addition, " conversation group " is shared RF frequency and time slot and one group of SU with same color.In illustrative example, discern each subscriber unit through 16 conversation group's identifiers (TGID) identification conversation group and through 24 subscriber unit identifiers (SUID).Therefore, in illustrative example, the SU that shares colour coding further is divided into each conversation group, thereby makes the SU in the conversation group can not hear the SU in another conversation group.
In the exemplary embodiment, have the predetermined characteristic of " impoliteness " and the SU that is in the Direct Model conducts interviews to channel, thereby do not considering that channel is whether busy or issue sending voice communication in the situation of any other factor of not considering channel.
In the exemplary embodiment, only if on channel, there is the RF energy, otherwise irrespectively other all SU had the predetermined characteristic of " courtesy " with colour coding and the SU that is under the Direct Model will be allowed to channel is conducted interviews.Term " the RF energy on the channel " is meant that the RF energy on the channel has surpassed the threshold value of stipulating among the SU.Therefore, in the exemplary embodiment, when the RF energy level that on channel, measures is higher than the CPS characteristic of channel access, forbid that SU conducts interviews to channel.In addition,, then allow SU to carry out " rudely " and send if SU is the participant of calling out, wherein said " rudely " be meant SU and then voice transfer begin to send.
In the exemplary embodiment; Only if only if exist voice transfer and the colour coding of SU on RF energy or the channel to be complementary on the channel, otherwise the SU of same color had the predetermined characteristic of " courtesy " and the SU that is under the Direct Model will be allowed to channel is conducted interviews.Therefore, before the voice transfer that allows or forbid being asked, SU will consider the colour coding whether RF energy and definite voice transfer are arranged on the channel.Above-mentioned transmission needs slot synchronization, to confirm the colour coding of the voice transfer on the channel.In addition,, then allow SU to carry out " rudely " and send if SU is the participant of calling out, wherein said " rudely " be meant SU and then voice transfer begin to send.
In the exemplary embodiment; When SU is in repeater mode and the voice communication on the channel is had the predetermined characteristic of " impoliteness "; Said SU required SU and BR downlink synchronization, the colour coding of correct to carry out verification and identification TDMA channel before allowing voice communication.In the exemplary embodiment, if BR is not waken up, specifically, if the down link of BR does not activate, then with BR can require to carry out the BR wakeup process synchronously.The SU that has the predetermined characteristic of " impoliteness " and be under the repeater mode does not provide protection to calling on the channel or transmission.Therefore, no matter voice transfer be simulation or numeral, whether have identical colour coding, whether be identical calling, " impolite " SU all can be for the communication of oneself access channel.
In the exemplary embodiment, if SU has the predetermined characteristic of " courtesy " and is in repeater mode all voice communications on the channel, then only after having considered channel status, just allow SU that channel is conducted interviews.If SU is in the repeater mode and all be " courtesy " to all voice communications, then no matter those transmission be simulation or numeral, whether have identical colour coding, whether be identical calling, all protect the transmission of co-channel users.In addition, if SU is the participant of ongoing calling, then allows SU to carry out " rudely " and send, wherein said " rudely " is meant and then effective transmission of well afoot.If SU is not the participant of ongoing calling, then do not allow the SU access channel.In operation, before for the voice communication access channel, combinations thereof requires SU to consider on channel, whether to exist the RF energy; Require the colour coding of BR downlink synchronization, correct to carry out verification and identification TDMA channel.Further, if BR is not waken up, specifically, if the down link of BR does not activate, then with BR can require to carry out the BR wakeup process synchronously.
In the exemplary embodiment, be in repeater mode and identical colour coding had " courtesy " predetermined characteristic after SU has only considered channel status, just allow SU visit wireless channel.Combinations thereof provides protection to the digital same channel user of using same color.In addition, if SU is the participant of any ongoing calling or transmission, then allow SU rudely to send.Similar with said circumstances, when SU is in repeater mode and have the predetermined characteristic of " impoliteness ", before allowing voice transfer, require SU to consider the RF energy measuring, carry out verification and identification TDMA channel with the colour coding of BR downlink synchronization, correct.Further, if BR does not wake up, specifically, if the down link of BR does not activate, then with BR can require to carry out the BR wakeup process synchronously.
With reference to figure 2-4, in operation, must wake subscriber unit up and be voice transfer request visit.As shown in Figure 2, subscriber unit is through pushing PTT request voice transfer (square frame 202).If press PTT, then whether be the participant (square frame 203) of ongoing calling to SU if watching it.If SU is the participant (square frame 203) of ongoing calling, then can allow SU for voice transfer access channel (square frame 416).If SU is not, and if SU do not waken up (square frame 204), then must wake SU (square frame 208) up.If waken SU up, judge then whether SU is scanning RF channel (square frame 206).If SU scans, then SU stops to scan and transferring to specific frequency with request voice transfer (square frame 210).If SU is not in scanning, then this process continues.
Then, SU request voice transfer.If SU asks voice transfer (square frame 212) in Direct Model, then the RF energy of SU supervisory channel (square frame 214) wherein in said Direct Model, need not repeater in communication.Direct Model also is called as the intercommunication pattern.If SU asks the non-Direct Model voice transfer of (also being called as repeater mode) (square frame 212), the RF energy of SU supervisory channel (square frame 222) then.In illustrative example, in Direct Model, SU utilizes the SU source to send with down-link frequencies synchronously, and in repeater mode, SU utilizes the SU source to send with uplink frequency synchronously.
In Direct Model, if surpassed RF energy threshold (square frame 214), then SU searches synchronously and color code information.If seek out further explanation, please refer to above-mentioned synchronously and the discussion of colour coding.According to synchronous and color code information, SU judges whether voice transfer is non-emergency call and the channel access that whether is defined as " courtesy " (square frame 216).In addition, all be (square frame 218) of " courtesy " if the channel access of " courtesy " has been stipulated SU to all, then SU sends negative feedback (square frame 220) to SU user.Therefore, on wireless channel, do not carry out voice transfer.Alternatively, if the channel access of " courtesy " has stipulated that SU is not all is (square frame 218) of " courtesy " to all, but oneself colour coding is had " courtesy " (square frame 218), then as shown in Figure 3, SU judges whether time slot is synchronous.
Further, if be in the Direct Model and surpass RF energy (square frame 214), SU then as shown in Figure 4 carries out to send and prepares (square frame 418).In addition, then as shown in Figure 4 if be in the Direct Model and surpassed RF energy threshold (square frame 214) and voice transfer is that urgent call or said voice transfer are " impoliteness " (square frame 216), allow SU use wireless channel to carry out voice communication.
In repeater mode,, just need not wake this BR (square frame 224) up if then wake base repeater (BR) up if do not surpass RF energy threshold (square frame 222).Wakeup process (square frame 224) starts from SU and sends a time slot wakeup message (square frame 228) to BR.This wakeup message is the idle message of carrying synchronizing information and color code information.Whether this colour coding of BR verification is correct and activate down link.Thus, as shown in Figure 2, if, then do not allow the request of voice transfer if BR is not activated or wakeup process failure in waking BR up.If the feedback (square frame 230) that the trial that BR wakes up after twice trial less than success (square frame 226), then gives SU user negates.
Further, in repeater mode, if surpass the RF energy threshold, then as shown in Figure 3, SU judges whether time slot is in (square frame 302) synchronously.In addition, as stated, if surpassed the RF energy threshold, then SU will search synchronously and color code information.
With reference now to Fig. 3,, whether the communication that SU at first watches between SU and the BR is in (square frame 302) synchronously.If not synchronously, then SU does not attempt carrying out (square frame 304) synchronously.After attempting carrying out synchronously (square frame 304); SU checks pattern (square frame 308), communication type (square frame 310) and " courtesy " type (square frame 310,312); Wherein said communication type for example is urgent or non-emergent; And said " courtesy " type for example is to all " courtesy ", to colour coding " courtesy " or " impoliteness " of oneself.If SU can not make the communication synchronization between BR and the SU or can not check above-mentioned parameter, then the user is provided negative feedback (square frame 314).
In the exemplary embodiment, between BR and SU, carrying out synchronously (square frame 304) comprises in order to detect the slot synchronization signal and waits for the preset time section.The slot synchronization signal is the 48 bits frame alignment words of (also being called as 24 symbols).For a time slot, per 360 milliseconds of slot synchronization signals can be used during audio call, and during other situation per 60 milliseconds available, described other situation comprise: call out dead time, channel dead time and transfer of data.In section at the fixed time, accomplish when detecting slot synchronization signal (square frame 306) and carry out synchronous step (square frame 304).
If the communication between SU and the BR is in synchronous regime (square frame 302) or SU has successfully accomplished (square frame 304) synchronously between BR and SU, then SU recovers colour coding (square frame 316) from the TDMA channel.In the exemplary embodiment, the colour coding of being recovered is available in each burst except the burst that comprises voice synchronous.Further, in the exemplary embodiment, think coupling has appearred and before SU the colour coding of being recovered and the colour coding of SU regulation are mated twice (square frame 318).If the colour coding of the colour coding of in said SU, being recovered and SU regulation is complementary by (square frame 318) and SU is in Direct Model, then do not allow SU to send and send negative feedback (square frame 324) to SU user.Be not complementary by (square frame 318) if be in the colour coding of Direct Model (square frame 320) and the colour coding of being recovered and SU regulation, then as shown in Figure 4, allow SU to use wireless channel to carry out voice communication (square frame 418).
With reference now to Fig. 4,, there is multiple situation (square frame 408,420) from negative feedback to SU user that send.Wherein a kind of situation is: SU is in repeater mode, detected the RF energy, with BR synchronously and colour coding and the regulation colour coding recovered be complementary, but said SU can not discern in the predetermined amount of time which time slot be one and which time slot be two (square frames 404).SU through to public notification channel (CACH) thus the TDMA channel field in the message decode and judge time-gap number.In the exemplary embodiment, before judging time-gap number, twice of the TDMA channel fields match in SU and the CACH message (square frame 404).If SU can not be at the fixed time judges the numbering (square frame 406) of time slot in the section, then send negative feedback (square frame 408) to SU user.
In addition; If SU confirms voice transfer and is non-emergency call and is given for " courtesy " channel access (square frame 410); And time slot is used (square frame 416) or said time slot by another SU shared (square frame 414) by total system signal post, then sends negative feedback (square frame 420) to SU user.In every other situation, allow SU to use wireless channel to carry out voice communication (square frame 418).For example, if activated the urgent characteristic of " courtesy " SU, then SU shows as " rudely " and can access channel.
In order to make SU allow to carry out voice transfer (square frame 418), SU can judge whether target time slot is idle (square frame 412).If the channel status field in the CACH message is represented idle channel, think that then target time slot is idle.Further, judge in order to make SU whether time slot is used (square frame 416) by total system signal post, SU judges that at first time slot is idle or occupied.This can realize (square frame 412) through the access type field in the CACH message is decoded.If it is idle that the access type field is represented time slot, thereby then SU is through decoding to another CACH message and checking that said access type field confirms said idle determination.If it is not idle that the access type field is represented time slot, then SU judges whether said SU is participant (square frame 414) movable on the said time slot.Thereby SU judges through the link control message of observing on the channel whether it is movable participant.If it is not movable participant that link control message is represented SU, then SU judges whether the activity on this time slot is used by system wide activity.If the activity on the time slot is not system wide activity (square frame 416), then allowing said SU is voice transfer and access channel (square frame 418).
In case SU has accomplished voice transfer, then BR sends message dead time, is defined as wherein said dead time when the voice transfer of SU finishes, to begin and do not have the movable time period in up link.Give the SU chance and make it can during dead time, propose the channel access request, and can utilize the free time of up link.Exemplary embodiment of the present invention is divided into calling section dead time and channel section dead time with section dead time of routine.As use, when BR is transformed into channel dead time, when BR closes, perhaps transmitted when excessively taking end of calling by " impolite " when channel. here
During calling out dead time, even up link is not in a hurry, BR also channel status bit is set to hurry.Further, BR sends link control message, thus notice as each SU that calls out participant can ignore channel status bit and can be for voice transfer access channel.Further, because BR is activated, therefore do not need SU to wake BR up.Particularly, need not to carry out under the situation of BR wakeup process, can be as the SU that calls out participant for channel being conducted interviews with the incoherent new voice transfer of previous calling.Call out when starting from the SU voice transfer dead time and finish and when channel begins dead time, finish.In the exemplary embodiment, calling continues several seconds dead time after calling out, for example continue 3 seconds.
During channel dead time, the BR channel status bit is set to the free time, and this allows any SU channel to be conducted interviews need not at first to send under the situation of BR wake-up sequence.Because BR is activated (key), therefore do not need SU to wake BR up.Thus, owing to need not to wake up BR, therefore hope that the SU of access channel has saved the time.During channel dead time, BR sends idle TDMA burst, is used for acknowledgement channel and is not used, and do not reserve for use.Channel is defined as such time period dead time, and the said time period starts from calls out when finishing dead time and end when the BR that expires as SIT closes.Further, SIT has covered to call out and has added the upper signal channel time of dead time dead time.In the exemplary embodiment, channel starts from and call out when finishing dead time and continue several seconds, for example two seconds dead time.
In exemplary embodiment of the present invention, SU considered dead time and " courtesy " before access channel.Particularly, during calling out dead time, no matter whether SU is defined as " courtesy " or ", and impolite " channel access can access channel as the SU of calling participant.Thus, if receive that as the SU that calls out participant channel is in the sign of calling out dead time, then SU can ask access channel.On the other hand, if SU is defined as " courtesy " channel access, during calling out dead time, not that the SU that calls out participant cannot send then.Thus, allowing another to call out before beginning on the channel, proceeding to call out at first offering an opportunity as the SU that calls out participant.
Under the situation of " impoliteness " channel access; The SU that is defined as " impoliteness " channel access can begin voice transfer at any time; Comprise a) between effective transmission period of another SU; B) during calling out dead time, c) during channel dead time, and d) even BR is not waken up.Thus, the SU that is defined as " impolite " channel access ignores the channel status field in the CACH message, and can not attempt distinguishing and call out dead time and channel dead time.
Thus, the present invention allows SU the actual conditions on the channel to be considered before the voice transfer carrying out.Through doing like this, as a rule, reduced the time of access channel.In addition, the present invention reduces such possibility, i.e. calling will be the calling participant but have the possibility of the SU interruption of same color, protect the continuity of ongoing calling thus.
Although described the present invention together with specific embodiment of the present invention, additional advantage and modification are easy to expect to those skilled in the art.Therefore, the present invention wideer aspect, the present invention is not limited to details, exemplary device and illustrative example shown and that describe.According to above-mentioned specification, those skilled in the art can easily make various replacements, modification and variation.Thus, be to be understood that the present invention is not limited to above-mentioned explanation, but comprised all such replacements, modification and variation according to the spirit and the protection range of appending claims.
Claims (11)
1. in a kind of wireless communication system, said wireless communication system comprises a plurality of subscriber units and radio station, a plurality of base station, and a kind of permission first subscriber unit is voice transfer and the method for access channel, and said method comprises the steps:
Confirm that first subscriber unit is defined as the visit to the courtesy of channel; Wherein said first subscriber unit is considered the type of the current communication of on channel, carrying out before for its oneself communication access channel, and wherein said first subscriber unit is characterised in that first colour coding and first ID of conversation group;
To the voice transfer of Channel Detection from second subscriber unit, wherein said second subscriber unit has the secondary color code and second ID of conversation group; And
If first ID of conversation group and second ID of conversation group are complementary, even then channel is used for voice transfer by second subscriber unit, also allow first subscriber unit for voice transfer access channel.
2. the method for claim 1 further comprises the steps:
If first colour coding and secondary color code are complementary and first ID of conversation group and second ID of conversation group are complementary; If then first subscriber unit be in dead time that channel is not used to voice transfer during the section in, be voice transfer and access channel with regard to allowing first subscriber unit.
3. method as claimed in claim 2 is defined as the time period that begins after the end of calling wherein said dead time.
4. the method for claim 1 further comprises the steps:
If first colour coding and secondary color code are not complementary,, be voice transfer and access channel with regard to not allowing first subscriber unit if in then first subscriber unit is in during calling section dead time that channel is being used to voice transfer.
5. the method for claim 1, wherein first subscriber unit is characterised in that Direct Model, first subscriber unit sends voice transfer to the 3rd subscriber unit of a plurality of subscriber units thus, and need not radio station, base station auxiliary in radio station, a plurality of base station.
6. the method for claim 1, wherein first subscriber unit is characterised in that repeater mode, first subscriber unit sends voice transfer through the radio station, base station of using radio station, a plurality of base station to the 3rd subscriber unit of a plurality of subscriber units thus.
7. the method for claim 1, the message of expression channel idle is sent at least one radio station, base station in the radio station, wherein said a plurality of base station.
8. method as claimed in claim 7, wherein said message are to call out message dead time.
9. method as claimed in claim 8, if wherein first ID of conversation group is complementary with the ID of conversation group that calls out message dead time, then allowing first subscriber unit is voice transfer and access channel.
10. the method for claim 1, wherein said wireless communication system is a tdma system.
11. in a kind of wireless communication system, said wireless communication system comprises a plurality of subscriber units and radio station, a plurality of base station, a kind of permission first subscriber unit is voice transfer and the method for access channel, and said method comprises the steps:
Confirm that said first subscriber unit is defined as the visit to the courtesy of channel; Wherein said first subscriber unit is considered the type of the current communication of on channel, carrying out before for its oneself communication access channel, and wherein said first subscriber unit is characterised in that first colour coding;
To the voice transfer of Channel Detection from second subscriber unit, wherein said second subscriber unit has secondary color code; And
If said first colour coding and said secondary color code do not match; Then be in Direct Model and when on said channel, having the predetermined characteristic of " courtesy " when said first subscriber unit from the voice transfer that is other subscriber units of characteristic with said first colour coding; Even said channel is used for voice transfer by said second subscriber unit, also allow said first subscriber unit to visit said channel for voice transfer.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58372304P | 2004-06-29 | 2004-06-29 | |
| US60/583,723 | 2004-06-29 | ||
| US10/984,431 | 2004-11-09 | ||
| US10/984,431 US7499441B2 (en) | 2004-06-29 | 2004-11-09 | Method for allowing a subscriber unit to access a channel for voice transmissions |
| PCT/US2005/019840 WO2006007293A2 (en) | 2004-06-29 | 2005-06-06 | Method and system for providing access to a channel for voice transmissions |
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| CN1977493A CN1977493A (en) | 2007-06-06 |
| CN1977493B true CN1977493B (en) | 2012-05-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6477387B1 (en) * | 1999-10-08 | 2002-11-05 | Motorola, Inc. | Method and apparatus for automatically grouping communication units in a communication system |
| GB2384393A (en) * | 2002-01-17 | 2003-07-23 | Motorola Ltd | Location specific group calls in a telecommunications system |
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| US6477150B1 (en) * | 2000-03-03 | 2002-11-05 | Qualcomm, Inc. | System and method for providing group communication services in an existing communication system |
| US6982961B2 (en) * | 2001-07-19 | 2006-01-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Push-to-talk and push-to-conference in a CDMA wireless communications system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6477387B1 (en) * | 1999-10-08 | 2002-11-05 | Motorola, Inc. | Method and apparatus for automatically grouping communication units in a communication system |
| GB2384393A (en) * | 2002-01-17 | 2003-07-23 | Motorola Ltd | Location specific group calls in a telecommunications system |
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| Publication number | Publication date |
|---|---|
| AU2008211998A1 (en) | 2008-09-25 |
| AU2008211998B2 (en) | 2009-11-12 |
| CN1977493A (en) | 2007-06-06 |
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