CN1805562A - Method of implementing in-group priority based speaking right preemption in group-call process - Google Patents
Method of implementing in-group priority based speaking right preemption in group-call process Download PDFInfo
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Abstract
The invention relates to a method for seizing communication right based on in-group priority in the communication, which comprises: setting a special control channel used by the group calling mobile station reports seizing information in the network; sending a in-group priority information of present user and the information of set shared special control channel to present group calling mobile station; when the mobile station receives the seizing instruction, if its in-group priority is higher than the in-group priority of present user, via set shared special control channel, reporting the access impulse (AB) with seizing request information; the network decodes AB to attain seizing request information, releases the ascending chain circuit possessed by present group caller, builds ascending chain circuit for said seizing mobile station in the group calling service channel, and makes seizing mobile station as present user to possess said ascending chain circuit to communicate. The invention can realize the seizing service on in-group priority of group communication system based on public network, to meet the demand of group users.
Description
Technical field
The present invention relates to communication means, relate in particular to a kind ofly in the group-calling process of trunked communication system, realize the method for hearer's travelling carriage according to press-and-talk (PTT) preemptive priority speaker travelling carriage speaking right in the group based on the public communication network trunked communication system.
Background technology
Trunked communication system is a kind of less expensive of growing up in recent years, command dispatching and communication system more flexibly, be widely used in units such as government bodies, energy traffic, airport harbour, industrial and mining enterprises, fire-fighting police, water conservancy and military affairs, to satisfy the needs of constituent parts intercommunication.
At first, trunked communication system adopts the mode of cluster private network to build networking.But because each group independently builds the cluster private network, therefore technology between group and standard disunity form the construction situation of doing things in his own way easily, cause drawbacks such as frequency utilization inefficiency, network construction cost and network operation expense height.Recently, along with trunking communicating technology is developed by simulation-to-digital, the trunking communication networking presents by the separate cluster dedicated network builds the trend to development to cluster public network Construction Party.Especially, because global system for mobile communications (GSM) technical system has developed fairly perfectly, have public network basis widely in the whole nation and even worldwide, therefore, development enjoys industry to pay close attention to based on the trunked communication system of gsm communication network.
At present, the international standard GSM-R that a cover is used for the railway mobile communication has been made in Europe, and it, can be finished basic group calling (VGCS) cluster communication service, and can realize basic voice dispatching call function as service bearer with the gsm communication network.Described group calling is the calling that a plurality of travelling carriages participate in simultaneously, and wherein speaker's travelling carriage can receive and transmission information, and hearer's travelling carriage can only receive information, and speaker's travelling carriage can change.
In existing GSM-R system, the mode of sharing same group-calling service channel by speaker's travelling carriage and hearer's travelling carriage realizes group-calling service.This kind mode is carried out in the process at group-calling service, sub-district at current speaker's travelling carriage place, all other hearer's travelling carriages are shared same group-calling service channel under speaker's travelling carriage and the same sub-district, be that the speaker sub-district is identical with other hearer sub-district in the group call region, only use a group-calling service channel; Hearer's travelling carriage of the non-speaker of other in group call region sub-district only uses a Traffic Channel.
But,, the requirement of business also is very different because the customer group of public network and special-purpose cluster network is different.The GSM communication network in the past mainly towards the public, related service is suitable for public service, also can't satisfy for some specific (special) requirements of trunked communication system.
In trunked communication system, need to realize the interior PTT preemptive priority business of group of group calling, this business need: in the group-calling process, the high hearer's travelling carriage of PTT priority can be seized the speech right of speaker's travelling carriage that PTT priority is low in the group in the group, take up link, thereby make this hearer's travelling carriage become speaker's travelling carriage.
Above-mentioned existing GSM-R system is in the mode that realizes group calling, because the up link of speaker sub-district group calling Traffic Channel is taken by current speaker's travelling carriage, hearer's travelling carriage in this sub-district can't be seized the speech authority of speaker's travelling carriage by the up link of group-calling service channel, if hearer's travelling carriage is initiated uplink takeover in the up link of this group-calling service channel, network side not only can not normal decoder on line correlation seize message, also can produce and disturb the uplink voice of speaker's travelling carriage.
Because above-mentioned technology barrier in existing European GSM-R system standard standard, only can be realized call priority (EMLPP) business at class of call, described calling comprises point to point call, group calling and multicast (VBS).But, can't realize the business of seizing at PTT priority in the group.After group calling is set up, all travelling carriages have the priority that is equal in this group, and in a single day certain travelling carriage becomes the speaker, before it discharges the speech right, other hearer's travelling carriage is not seized the right of speaking right, therefore can not satisfy the specific demand of cluster department for group-calling service.
Summary of the invention
Main purpose of the present invention provides the method that realizes seizing based on in-group priority speaking right in a kind of group-calling process, make cluster communication system based on public network in group-calling process, realization is seized business at the PTT of in-group priority, satisfies the needs of cluster user.
Technical scheme particular content provided by the invention is as follows:
Realize seizing the method for speaking right in a kind of group-calling process based on in-group priority, be applicable to trunked communication system based on public network, specify in advance to be used for the Dedicated Control Channel that the group calling travelling carriage reports preemption information, and in group-calling process, further may further comprise the steps:
A, network side send the in-group priority information of the current speaker's travelling carriage of this group calling to the travelling carriage of current group calling;
After the travelling carriage of B, current group calling receives preemption instructions, become and seize travelling carriage, whether the in-group priority of judging self is higher than current speaker's travelling carriage in-group priority, if then report to network side by above-mentioned appointment Dedicated Control Channel and carry the access pulse AB that seizes solicited message;
After C, network side receive AB, obtain the entrained information of this AB, discharge the up link that current group calling speaker travelling carriage takies; And return and allow the response message seized to the described travelling carriage of seizing;
D, described seize travelling carriage and receive the response message allow to seize after, send the request that takies up link to network side, after network side receives this request, in the group-calling service channel, seize travelling carriage and set up up link for this, seizing travelling carriage becomes current speaker's travelling carriage, and takies this up link and talk.
Among described steps A, further comprise:
Network side sends the sign of this group calling to the travelling carriage of current group calling;
And seize travelling carriage described in the step B and in the AB that reports, further carry the sign that this seizes group calling under the travelling carriage;
Among the step C, after network side obtains the entrained information of AB, and discharge before the up link that current speaker's travelling carriage takies, further comprise:
Judge that according to the group calling of obtaining sign this seizes the group calling under the travelling carriage, determine current speaker's travelling carriage and its up link that takies of this group calling again.
Take described in the step D in the request of up link and comprise the in-group priority of seizing travelling carriage, and after step D, return steps A.
Described public network is the mobile communication network based on global system for mobile communications.
Described Dedicated Control Channel is a Separate Dedicated Control Channel.
Described network side comprises moving exchanging center MSC and base station sub-system BSS, and the detailed process that network side is carried out described step C is:
C1, BSS receive AB, to this AB decoding, obtain to seize solicited message, send the request message that takies up link to MSC;
BSS sent the request message that discharges up link under C2, MSC gave current group calling speaker travelling carriage;
After BSS receives the request message of described release up link under C3, the current speaker's travelling carriage, discharge the shared up link of current speaker's travelling carriage, and return up link release response to MSC;
After C4, MSC receiving uplink discharged response, the BSS that takies up link to request returned the response message that allows to take up link;
After the BSS that C5, request take up link receives response message, return and allow the response message seized to seizing travelling carriage.
After execution in step C4, further comprise: MSC judges whether to receive the release up link refuse information of BSS loopback, if receive, then initiates to discharge uplink requests to BSS once more, otherwise, continue to work as pre-treatment.
Among the step D, the process that described network side is set up up link is: seize the affiliated BSS of travelling carriage and receive the request that takies up link, set up up link, and return the affirmation response of setting up up link to MSC.
After execution in step C2, MSC judges whether to receive that the affirmation of setting up up link that BSS returns responds in the regular hour, if receive, then send the message that up link takies to the relevant BSS of current group calling, otherwise, initiate to discharge uplink requests to BSS once more.
At execution in step C1 during the step C4,
If BSS receives once more that current group calling hearer travelling carriage reports seize solicited message after, then this request of seizing is not handled.
After step C1, before the step C2, further comprise:
C11, MSC forbid preemption information for the relevant BSS transmission of current group calling, and BSS forbids that with this preemption information sends to the hearer's travelling carriage in the current group calling, receives that this hearer's travelling carriage of forbidding preemption information stops to report preemption information.
After described step C11, and be described seizing before travelling carriage sets up up link, further comprise at network side described in the step D:
Whether the MSC real-time judge receives the request message that takies up link that the relevant BSS of current group calling sends, if receive, returns refusal then for this BSS and takies uplink message and forbid preemption information.
The down link of described Dedicated Control Channel is the Cell Broadcast CB down channel.
Described Dedicated Control Channel is the Dedicated Control Channel that a plurality of group callings are shared.
Described in-group priority is press-and-talk priority in the group.
Beneficial effect of the present invention has:
1, because the present invention makes the interior high priority travelling carriage of the group calling of different group callings by sharing PTT preemptive priority in the special-purpose SDCCH channel initiation group, needn't take the group-calling service channel, therefore can realize satisfying of the specific (special) requirements of cluster department for group-calling service at the business of seizing of PTT priority in the group.
2, because the present invention uses the SDCCH channel to report preemption information, and the SDCCH channel does not need to set up in advance link, hearer's travelling carriage only needs to fix a point to report in the SDCCH channel to insert pulse (AB), need not to initiate by Random Access Channel (RACH), compole is short when used, generally has only several ms, leaving the group business when therefore hearer's travelling carriage reports preemption information exhales the time of channel very short, report speed is fast, and the proper communication of hearer's travelling carriage is unaffected, to the not influence of basic service of group calling.
3, because of the present invention to be used to report the SDCCH channel of preemption information be that a plurality of group callings are shared, need not each group calling and take the SDCCH channel separately, so the resource utilization height, improve the treatment effeciency of communication system.
4, because the present invention will share by group calling sign (GC_ID) seizes the AB that the SDCCH channel reports and be mapped with concrete group calling, so network side can distinguish the preemption information that reports fast and belong to which group calling, realize simple, group calling search efficiency height.
5, share the up link of seizing the SDCCH channel owing to report preemption information only to use, therefore share the down link of seizing the SDCCH channel and can also be used as the Cell Broadcast CB down channel, can further promote the utilance of SDCCH channel.
Description of drawings
Fig. 1 organizes the flow chart of interior PTT preemptive priority success for of the present invention by sharing the Preempt_SDCCH channel;
Fig. 2 organizes the flow chart of interior PTT preemptive priority failure for of the present invention by sharing the Preempt_SDCCH channel;
Fig. 3 for of the present invention by share the Preempt_SDCCH channel organize in during the PTT preemptive priority, in BSC, seize the flow chart of competition;
Fig. 4 for of the present invention by share the Preempt_SDCCH channel organize in during the PTT preemptive priority, between BSC, seize the flow chart of competition.
Embodiment
Further specify implementation method of the present invention below in conjunction with the drawings and specific embodiments.
The present invention is applicable to the group-calling process based on the wireless trunking communication system of public network, and the embodiment of this paper is that the present invention will be described for example with the wireless trunking communication system based on the GSM public network.
In the present embodiment, the one or more Separate Dedicated Control Channels (SDCCH) with gsm communication system are set to seize Separate Dedicated Control Channel (Preempt_SDCCH) in advance, are used for travelling carriage and report the PTT preemption information.Travelling carriage reports the PTT preemption information by inserting pulse train (AB) in this Preempt_SDCCH channel.In the present embodiment, the base station sub-system of gsm communication system network side (BSS) activates this Preempt_SDCCH channel in semipermanent mode, so-called semipermanent mode is meant that with a SDCCH channel fixed configurations be the Preempt_SDCCH channel, be used for reporting the PPT preemption information of travelling carriage specially, this Preempt_SDCCH only needs once to activate, can share for a plurality of group callings and use, need not repeatedly to activate.In addition, the present invention is not limited to semipermanent mode and activates the Preempt_SDCCH channel, also can activate a SDCCH channel as required in real time is the Preempt_SDCCH channel, such as determining that 10 group callings share a Preempt_SDCCH channel, then can distribute new Preempt_SDCCH channel to give the group calling that exceeds during group calling above ten.
In the Preempt_SDCCH channel, different group callings report preemption information by AB different in the Preempt_SDCCH channel respectively, and the AB that different group calling reports is corresponding with this group calling sign (GC_ID) respectively, and can distinguish by GC_ID.
Fig. 1 organizes the flow chart of interior PTT preemptive priority success for of the present invention by sharing the Preempt_SDCCH channel, and as shown in Figure 1, this flow process comprises:
After step 101, current group calling are created, descending Fast Associated Control Channel (FACCH) the last cycle of the group-calling service channel correspondence of the base station controller among the BSS (BSC) under current group calling different districts sends speaker's informational message (TALKER_INFORMATION) (preemptflg, priority, Preempt_SDCCH, GC_ID, UIC); Hearer's travelling carriage in the current group calling is in the listening state of group-calling channel receiving mode after group calling is set up successfully, receive the information that network side transmits, comprising above-mentioned speaker's informational message.
The telephone number that carries the precedence information (priority) that whether allows the sign of seizing (preemptflg), current speaker's travelling carriage, current speaker's travelling carriage in speaker's informational message identifies (msisdn), identifies the up link identification code (UIC) of GC_ID and travelling carriage channel request coding usefulness on the Preempt_SDCCH channel about the descriptor of Preempt_SDCCH channel, current group calling.
In this speaker's informational message: the preemptflg value is 1, and expression allows to seize; The time slot position of the physical channel that the descriptor of Preempt_SDCCH channel is shone upon for this Preempt_SDCCH channel; UIC is the used input parameter of encryption algorithm, and travelling carriage utilizes this UIC to carry out AB coding, and is same, and network side has only with this UIC just can decode data among the AB.
Step 102, when there is the speaker in current group calling, after in case hearer's travelling carriage receives the PTT preemption instructions, if PTT priority is higher than PTT priority in speaker's travelling carriage group in the group of self, and the channel of seizing of current area is a Preempt_SDCCH channel mode, then reports to BSS and seizes request message.
Generally by the PTT key input of user by being provided with on the travelling carriage, if press the success of PTT key uplink takeover, then hearer's travelling carriage becomes speaker's travelling carriage to above-mentioned PTT preemption instructions.
The detailed process of this step 102 is:
Step 1021, hearer's travelling carriage judge whether to receive the PTT preemption instructions when the listening state of group-calling channel receiving mode, if then this hearer's travelling carriage is for seizing travelling carriage, and execution in step 1022, otherwise, return step 1021.
Step 1022, judge that according to the preemptflg in the current speaker's informational message that receives current whether the permission seize, if then execution in step 1023; Otherwise, return step 1021;
Step 1023, judge whether the in-group priority of self is higher than current speaker's in-group priority, if then execution in step 1024, otherwise, return step 1021.
Step 1024, this seizes travelling carriage AB pulse by 11 bits or 8 bits on the Preempt_SDCCH of its affiliated subdistrict channel and reports and seize request message (Preempt_ChanReq) (GC_ID Rand), wherein carries GC_ID and Rand information.This Rand information is random number, is used to identify the current AB pulse that travelling carriage reports of seizing, and for the AB that each travelling carriage reports, it is corresponding with this AB all to produce a Rand information at random; Seize travelling carriage and preserve the frame number (FrmNum) and the Rand information of the affiliated frame of the AB that sends of institute, and send seize request message after, get back to the listening state of group-calling channel receiving mode at once.
Step 103, base station transceiver (BTS) detect AB in the Preempt_SDCCH channel after, this AB is decoded, obtain seizing request message, determine the frame number of the affiliated frame of this AB, calculate sign distance leaving from station (TA) value, and send to base station controller (BSC) and to seize request message (Preempt_ChanReq) (GC_ID, Rand, FrmNum, TA), wherein carry GC_ID and Rand, and increase the FrmNum and the TA of the affiliated frame of AB.
The method of frame FrmNum for example can be utilized formula: FN=51 (T3-T2) mod (26) for the known technology of existing gsm protocol regulation under above-mentioned definite AB)+T3+51 * 26 * T1 is definite; Wherein FN is the frame number of frame under the AB, T1, and T2, T3 are travelling carriage and base station counter.Described TA value takies the information of up link necessity for travelling carriage, how to determine that in view of above-mentioned the TA value also is existing known technology, and this paper no longer narrates.
Step 104, BSC send uplink requests message (Uplink_Request) to mobile switching centre (MSC), and request takies up link; The solicited message of seizing that comprises the current group calling of sign in this message.
Behind step 105, the MSC receiving uplink request message, determine current group calling according to the GC_ID in this message, and send to the relevant BSC of this group call region and to carry speaker's informational message (the TALKER_INFORMATION) (preemptflg that forbids preemption information, priority, msisdn), wherein carry the priority priority of preemptflg, current speaker's travelling carriage and the telephone number sign msisdn of speaker's travelling carriage.This moment, the preemptflg value was 0, was illustrated in this and seized flow process and forbid other Mobile Origination uplink takeover before finishing; And the type of number among the mslsdn is designated invalid (Invalid), represents that this current speaker is seized.
Relevant BSC receive this carry forbid seizing the TALKER_INFORMATION message of sign after, this is carried the TALKER_INFORMATION forwards of forbidding seizing sign give the travelling carriage of current group calling, after travelling carriage receives this message, both made and received the PTT preemption instructions, can not send yet and seize request message, promptly stop to seize.
Step 106, MSC send uplink takeover release message (Uplink_Preempt_Release_CMD) for the BSC under current speaker's travelling carriage, and the up link of initiating current speaker's travelling carriage discharges flow process.
After BSC under step 107, the current speaker's travelling carriage receives described uplink takeover release message, send up link release message (Uplink_Realease) to current speaker's travelling carriage, after current speaker's travelling carriage receives this message, the up link of release busy.
BSC under step 108, the current speaker's travelling carriage sends to BTS and discharges request message (Release_Req), and request BTS discharges up link.
After step 109, BTS receive and discharge request message, discharge the up link that current speaker's travelling carriage takies, after discharging successfully, to return up link to BSC and discharge affirmation response (Release_CNF), the up link that notice BSC speaker travelling carriage takies discharges.
BSC under step 110, the current speaker's travelling carriage returns uplink takeover to MSC and discharges response message (Uplink_Preempt_Release_CMP), and the up link that notice MSC speaker travelling carriage takies discharges.
Step 111, MSC send uplink requests response message (Uplink_Req_Ack) to the BSC that request takies up link, accept this and seize, and expression allows to seize travelling carriage and takies.
After step 112, BSC receive and discharge response, give and seize travelling carriage and send and allow to seize uplink message (Uplink_Grant) (Rand, FrmNum TA), notify this to seize travelling carriage and can carry out up link and take; This allows to seize and carries Rand, FrmNum and TA in the uplink message, and wherein the value of Rand is to obtain according to seizing the Rand value that travelling carriage reports, and the value of FrmNum and TA is determined by above-mentioned steps 103.
Step 113, seize travelling carriage and receive Uplink_Grant (Rand, FrmNum, TA) after the message, relatively whether the Rand in this message is identical with the Rand and the FrmNum that self preserve with FrmNum information, if it is identical, illustrate that then BSS agrees to take up link to originally seizing travelling carriage, therefore this is seized travelling carriage and sends link setup frame (SABM) message that expression takies up link at the up link employing TA of group-calling channel to BTS, initiate the link setup flow process, comprise the number mark imsi and the interior PTT priority priority of group that seize travelling carriage in this SABM message.Described TA is used for accurately determining the position of up link.
After step 114, network side receive SABM message, begin to carry out the link setup process, in the group-calling service channel, seize travelling carriage and set up up link for this, and seize travelling carriage in link setup success back to this and return the link setup response, be UA message, to set up successfully, to comprise in this UA message number mark imsi and the interior PTT priority priority of group that seizes travelling carriage to seizing travelling carriage affirmation up link.
In view of the known technology of concrete link setup flow process for existing gsm system, no longer narration herein.
Step 115, BTS send to BSC and set up layer two connection request message, be link setup indication (Est_Ind) (imsi, priority) message, connect Est_Ind (imsi priority) comprises PTT priority priority in the number mark imsi that seizes travelling carriage and the group in the message so that set up layer two between BTS and the BSC.
Step 116, BSC send the busy message Uplink_Busy of up link for the travelling carriage in all related cell of current group calling, purpose is to forbid that other travelling carriage seizes, after other travelling carriages are received the busy message of this up link, both made to receive the PTT preemption instructions, and also can not send and seize request message.
Step 117, BSC send uplink acknowledgment message (Uplink_Req_CFM) to MSC, and (imsi priority), wherein carries the number mark imsi and the precedence information priority that seize travelling carriage; After MSC receives this uplink acknowledgment message, confirm that this travelling carriage seizes success, and this is seized travelling carriage as speaker's travelling carriage.
Step 118, MSC send up link to other relevant BSC of current group calling and take message (Uplink_Seized_CMD), are used to show that up link is occupied; After other relevant BSC received that this up link takies message, the group-calling channel FACCH by all related cell of self administering informed the current speaker's of the existence travelling carriage of travelling carriage in the group to the descending transmission of the travelling carriage of this group calling (Uplink_Busy) message.
Step 119, MSC each BSC in this group call region sends and carries speaker's informational message (the TALKER_INFORMATION) (preemptflg that allows to seize sign, priority, msisdn, chanMode), wherein carry: preemptflg, this preemptflg value is 1, is expressed as to allow to seize; The priority priority of current speaker's travelling carriage; The telephone number sign msisdn of current speaker's travelling carriage; And chanMode, this chanMode is used to identify the group-calling channel mode, and first kind of mode is that group calling speaker travelling carriage and hearer's travelling carriage are shared a group-calling channel mode; The second way is that group calling speaker travelling carriage occupies a group-calling channel separately and the mode of the shared group-calling channel of hearer's travelling carriage.Method of the present invention all is fit to for this dual mode.
The purpose of this step is: inform that each interior BSC of group calling can carry out PTT again and seize.
After step 120, BSC reception allow to seize speaker's informational message of sign from carrying of MSC,, return step 101 for current group calling distributes GC_ID, cycle sends speaker's informational message (TALKER_INFORMATION) (preemptflg, priority, Preempt_SDCCH, GC_ID, UIC).
The telephone number that carries the precedence information priority that allows the sign preemptflg that seizes, current speaker's travelling carriage, current speaker's travelling carriage in speaker's informational message in this step identifies msisdn, marks GC_ID and UIC about the descriptor of Preempt_SDCCH channel, current group calling.
Fig. 2 is of the present invention by sharing the flow chart of capable group of interior PTT preemptive priority failure of Preempt_SDCCH channel.As shown in Figure 2, the step that comprises in this flow process is similar to step shown in Figure 1, and difference is:
When discharging up link, when promptly execution in step 106 was to step 117, MSC judged whether to receive the release up link refuse information of BSC loopback, if receive, then execution in step 201, otherwise, execution in step 111.
Perhaps, after MSC sends Uplink_Req_Ack message, judge whether in the regular hour, to receive Uplink_Req_CFM message that if do not receive, then execution in step 201, otherwise, execution in step 118.Herein, certain hour can be pre-configured, in the present embodiment default tentative be 1 second, controlling this time method has multiplely, timer for example can be set control this time.
Step 201, MSC initiate to discharge the flow process of up link again, are about to up link and are changed to Idle state again, so that travelling carriage can be seized.
The purpose of handling process shown in Figure 2 is, discharging up link or when seizing travelling carriage and set up up link, the situation that some seized or seized failure unusually may appear, cause the group call uplink link to be hung, MSC can not correctly learn the truth of up link, in order to tackle these abnormal conditions, this moment, MSC needed again up link to be changed to idle condition, and the group calling user can reuse up link.
Fig. 3 for of the present invention by share the Preempt_SDCCH channel organize in during the PTT preemptive priority, in BSC, seize the flow chart of competition, as shown in Figure 3, in this flow process, after step 104, before the step 111, that is: BSS gives after the MSC reporting uplink link request message, before receiving the Uplink_Req_Ack message of MSC loopback, further comprise:
Insert request Chan_Req message if receive the up link that current group calling hearer travelling carriage reports, then BSC does not handle this Chan_Req message.The up link that above-mentioned hearer's travelling carriage reports inserts request and may be sent by hearer's travelling carriage self, also may be that the up link that misconnection is gone into inserts request.
The purpose of aforesaid operations is, in step 105, other travelling carriages of each sub-district send the information of forbidding uplink takeover in current BSC, therefore, other any travelling carriages are seized in the process of accepting current, and promptly step 104 can not be initiated the request of seizing again to the process of step 111, seize request, the processing of then ignoring if initiate.This mechanism of the present invention is called seizes competition process mechanism in the BSC.Seize competition process mechanism in the BSC and can guarantee that the related cell travelling carriage exists when seizing up link in BSC, guaranteed to seize in the BSC the orderly processing of accepting and seizing refusal; The PTT preemptive priority is time-based seizing in the group during the inherent up link of whole group calling scope takies, promptly seizes earlier, handle earlier, after seize, do not handle.This be since travelling carriage when seizing message by AB reporting uplink link, the AB bearer cap is less, have only 8 bits or 11 bits, therefore can't again PTT precedence information in the group of travelling carriage be reported by AB, which network side also can't be handled by each priority decision of seizing travelling carriage relatively and seize travelling carriage, can only be to rob the processing of taking the lead earlier therefore.
Fig. 4 for of the present invention by share the Preempt_SDCCH channel organize in during the PTT preemptive priority, between BSC, seize the flow chart of competition, as shown in Figure 4, in this flow process, receive uplink requests message at MSC, return to BSC and to forbid seizing after speaker's informational message, and receiving the UPLINK_REQ_CFM that this BSC sends over (imsi is priority) before the message, promptly after step 105, before the step 117, further comprise:
Step 401, whether the MSC real-time judge receives the uplink requests message that other relevant BSC of current group calling sends, if receive, then MSC returns refusal at once this BSC and takies uplink message (Uplink_Rej) and speaker's informational message TALKER_INFORMATION, comprise in this speaker's informational message and forbid seizing sign preemptflg, this BSC receiving uplink refuse information and carry forbid seizing the TALKER_INFORMATION message of sign after, stop to send uplink requests message, and this BSC carries the TALKER_INFORMATION message of forbidding seizing sign to hearer's travelling carriage transmission of its pipe, informs that hearer's travelling carriage stops to seize.
Usually, after the above-mentioned steps 105, before the step 117, it is a kind of operation of illegally seizing that other BSC sends uplink requests message, because after MSC receives uplink requests message for the first time, the TALKER_INFORMATION message of forbidding seizing sign is carried in other BSC loopbacks in current BSC and this group calling at once, therefore should not receive uplink requests message again.And if receive uplink requests message, then have two kinds of situations this moment: a kind of situation is that hearer's travelling carriage of related cell is not received and carried the TALKER_INFORMATION message of forbidding seizing sign, and this situation can be regarded as and illegally seizes; Another kind of situation is that the travelling carriage among the different B SC almost initiates to seize request simultaneously, causes BSC almost to initiate uplink requests message to MSC simultaneously, and this situation can be regarded the competition of seizing between the BSC as.
Among the present invention, report preemption information only to use the up link of shared Preempt_SDCCH channel, the down link of therefore sharing the Preempt_SDCCH channel can also be used as the Cell Broadcast CB down channel, can further promote the utilance of SDCCH channel.
In addition, in the foregoing description, adopt a plurality of group callings to share the scheme of a SDCCH channel, the present invention can also adopt a group calling to exclusively enjoy the interior PTT preemptive priority of mode initiation group of a SDCCH channel, can reach goal of the invention of the present invention equally.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (15)
1, realizes seizing the method for speaking right in a kind of group-calling process based on in-group priority, be applicable to trunked communication system based on public network, it is characterized in that, specify in advance to be used for the Dedicated Control Channel that the group calling travelling carriage reports preemption information, and in group-calling process, further may further comprise the steps:
A, network side send the in-group priority information of the current speaker's travelling carriage of this group calling to the travelling carriage of current group calling;
After the travelling carriage of B, current group calling receives preemption instructions, become and seize travelling carriage, whether the in-group priority of judging self is higher than current speaker's travelling carriage in-group priority, if then report to network side by above-mentioned appointment Dedicated Control Channel and carry the access pulse AB that seizes solicited message;
After C, network side receive AB, obtain the entrained information of this AB, discharge the up link that current group calling speaker travelling carriage takies; And return and allow the response message seized to the described travelling carriage of seizing;
D, described seize travelling carriage and receive the response message allow to seize after, send the request that takies up link to network side, after network side receives this request, in the group-calling service channel, seize travelling carriage and set up up link for this, seizing travelling carriage becomes current speaker's travelling carriage, and takies this up link and talk.
2, the method for claim 1 is characterized in that, among described steps A, further comprises:
Network side sends the sign of this group calling to the travelling carriage of current group calling;
And seize travelling carriage described in the step B and in the AB that reports, further carry the sign that this seizes group calling under the travelling carriage;
Among the step C, after network side obtains the entrained information of AB, and discharge before the up link that current speaker's travelling carriage takies, further comprise:
Judge that according to the group calling of obtaining sign this seizes the group calling under the travelling carriage, determine current speaker's travelling carriage and its up link that takies of this group calling again.
3, the method for claim 1 is characterized in that, takies described in the step D in the request of up link to comprise the in-group priority of seizing travelling carriage, and after step D, returns steps A.
4, the method for claim 1 is characterized in that, described public network is the mobile communication network based on global system for mobile communications.
5, method as claimed in claim 4 is characterized in that, described Dedicated Control Channel is a Separate Dedicated Control Channel.
6, method as claimed in claim 4 is characterized in that, described network side comprises moving exchanging center MSC and base station sub-system BSS, and the detailed process that network side is carried out described step C is:
C1, BSS receive AB, to this AB decoding, obtain to seize solicited message, send the request message that takies up link to MSC;
BSS sent the request message that discharges up link under C2, MSC gave current group calling speaker travelling carriage;
After BSS receives the request message of described release up link under C3, the current speaker's travelling carriage, discharge the shared up link of current speaker's travelling carriage, and return up link release response to MSC;
After C4, MSC receiving uplink discharged response, the BSS that takies up link to request returned the response message that allows to take up link;
After the BSS that C5, request take up link receives response message, return and allow the response message seized to seizing travelling carriage.
7, method as claimed in claim 6 is characterized in that, after execution in step C4, further comprise: MSC judges whether to receive the release up link refuse information of BSS loopback, if receive, then initiates to discharge uplink requests to BSS once more, otherwise, continue to work as pre-treatment.
8, method as claimed in claim 6, it is characterized in that among the step D, the process that described network side is set up up link is: seize the affiliated BSS of travelling carriage and receive the request that takies up link, set up up link, and return the affirmation response of setting up up link to MSC.
9, method as claimed in claim 8, it is characterized in that, after execution in step C2, MSC judges whether to receive that the affirmation of setting up up link that BSS returns responds in the regular hour, if receive, then send the message that up link takies to the relevant BSS of current group calling, otherwise, initiate to discharge uplink requests to BSS once more.
10, method as claimed in claim 6 is characterized in that, at execution in step C1 during the step C4,
If BSS receives once more that current group calling hearer travelling carriage reports seize solicited message after, then this request of seizing is not handled.
11, method as claimed in claim 6 is characterized in that, after step C1, before the step C2, further comprises:
C11, MSC forbid preemption information for the relevant BSS transmission of current group calling, and BSS forbids that with this preemption information sends to the hearer's travelling carriage in the current group calling, receives that this hearer's travelling carriage of forbidding preemption information stops to report preemption information.
12, method as claimed in claim 11 is characterized in that, after described step C11, and is described seizing before travelling carriage sets up up link at network side described in the step D, further comprises:
Whether the MSC real-time judge receives the request message that takies up link that the relevant BSS of current group calling sends, if receive, returns refusal then for this BSS and takies uplink message and forbid preemption information.
13, the method for claim 1 is characterized in that, the down link of described Dedicated Control Channel is the Cell Broadcast CB down channel.
14, the method for claim 1 is characterized in that, described Dedicated Control Channel is the Dedicated Control Channel that a plurality of group callings are shared.
As claim 1 or 3 described methods, it is characterized in that 15, described in-group priority is press-and-talk priority in the group.
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| CNB2005100004751A CN100387077C (en) | 2005-01-11 | 2005-01-11 | Method of implementing in-group priority based speaking right preemption in group-call process |
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| CNB2005100004751A CN100387077C (en) | 2005-01-11 | 2005-01-11 | Method of implementing in-group priority based speaking right preemption in group-call process |
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| CN100387077C CN100387077C (en) | 2008-05-07 |
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