CN102802127A - Communication link establishment method of mobile communication system and frame structure of mobile communication system - Google Patents
Communication link establishment method of mobile communication system and frame structure of mobile communication system Download PDFInfo
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- CN102802127A CN102802127A CN2012102582385A CN201210258238A CN102802127A CN 102802127 A CN102802127 A CN 102802127A CN 2012102582385 A CN2012102582385 A CN 2012102582385A CN 201210258238 A CN201210258238 A CN 201210258238A CN 102802127 A CN102802127 A CN 102802127A
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Abstract
The invention relates to a communication link establishment method of a mobile communication system and a frame structure of the mobile communication system. According to the communication link establishment method, a base station receives a link establishment request of a calling mobile station and allocates uplink and downlink channel resources to calling immediately, channel allocation information is transmitted to the calling mobile station by virtue of a downlink control channel, and a paging control channel calls a called mobile station and informs the called mobile station of the channel allocation information, so that the calling mobile station and the called mobile station can reside in the allocated channels to release an occupied uplink control channel and a downlink control channel and therefore the base station and other mobile stations can access or transmit a control signaling by utilizing the uplink control channel and the downlink control channel. Because the calling mobile station and the called mobile station are fast shifted to the allocated service channels, information transmission among the subsequent calling mobile station, the called mobile station and the base station is born by allocated special channels, collision caused by the condition that multiple users seize the channels can not occur, the access success rate is better improved, the access delay is greatly reduced, and the service performance is improved.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of communication link method for building up and frame structure thereof of GSM.
Background technology
For trunked communication system, a plurality of channels of a plurality of carrier waves are supported in a base station, in order to improve channel utilization; The elevator system performance, before between mobile station MS, communicating, caller MS at first need initiate application to base station BS; By BS paging called MS; And for caller called MS allocated channel, set up link after, calling and called MS could carry out message transmission on the channel that distributes.The foundation of communication link between MS; For prior art; The DMR standard that proposes with ETSI is an example, mainly transmits the signaling between travelling carriage and the base station through cluster control channel TSCC, and the TSCC channel comprises inbound channel (up channel) and departures channel (down channel); The link establishment of DMR system generally comprises following steps, and is as shown in Figure 1:
1) the caller travelling carriage initiates to insert at random on the inbound channel of TSCC channel, and service request is sent to the base station;
2) base station is through paging called mobile station on the departures channel of TSCC channel;
3) after called mobile station listens to the calling on the TSCC channel, adopt the inbound channel of TSCC channel, send response message to the base station;
4) after the base station received the response message of called mobile station, on the departures channel of same TSCC channel, the transmitting channel permission sent to caller MS and called MS with traffic channel configuration information.
So far, communication link is set up and is accomplished between calling and called, can begin on the channel that distributes, to communicate.
Such scheme is applicable to the trunking communication mode of this pair of time slot alien frequencies of DMR transfer, is not suitable for multi-slot TDMA structure, and simultaneously, it is longer that this method takies the control channel time, increased the weight of the control channel load, influences the access performance of system.For the wireless communication system that adopts the TDMA multi-access mode, in the prior art, adopt calling link setup mode time delay big, the control channel load is high, can't satisfy the bigger tdma system service access demand of channel capacity.
Summary of the invention
Main purpose of the present invention is to overcome the wireless communication system of the TDMA multi-access mode of prior art; Adopt calling link setup mode time delay big; The control channel load is high; Can't satisfy the bigger tdma system service access demand shortcoming of channel capacity, the frame structure that proposes in a kind of TDMA GSM reaches the communication link method for building up based on the GSM of this frame structure.
The present invention adopts following technical scheme:
A kind of communication link method for building up of GSM, it is characterized in that: concrete steps are following
1) the caller travelling carriage is initiated request for building link through ascending control channel to the base station;
2) base station receives the request of caller travelling carriage, and the distribution service channel also sends and inserts request response;
3) base station is sent the paging control messages through down channel to called mobile station;
4) called mobile station receives after the paging control information handles, and forwards on the Traffic Channel of distribution and sends page-response message;
5) base station is sent link establishment on the down channel that distributes, for caller travelling carriage and called mobile station and is accomplished message and transmission permission after receiving the page-response message of called mobile station on the up channel that distributes;
6) after caller travelling carriage and called mobile station received link establishment completion message, the caller travelling carriage began on the Traffic Channel of distributing, to communicate by letter with called mobile station.
Further, in step 1), sent request for building link message after, the down control channel that the caller travelling carriage is monitored and ascending control channel matches mutually carries business model parameter and called mobile station address in the request for building link information.
Further, in step 1), sent request for building link information after; Start timer T1; If on corresponding down control channel, do not receive the response message of base station in the overtime back of timer T1, then show access failure, the caller travelling carriage is according to the number of times of access attempts at random that disposes and insert handling process at random; Select the rollback time and insert opportunity at random, carry out access attempts once more.
Further; In step 2) in, the base station with down control channel that ascending control channel matches mutually on, send for the caller travelling carriage and insert request response; This inserts in the request response, comprises caller travelling carriage address and channel allocation indication information at least.
Further, in step 3), the base station is sent the paging control messages through Paging Control Channel to called mobile station, and this paging control messages comprises business model parameter, called mobile station address and channel allocation indication.
Further, said paging control messages also comprises the caller travelling carriage address that supplies called mobile station identification.
Further, the transmission broadcast message of period of broadcast channel property is also passed through in the base station in step 3), so that the travelling carriage in the overlay area can be discerned its existence, time division multiplexing is adopted in the distribution of this broadcast channel and said Paging Control Channel.
Further, in step 3), sent the paging control messages after; Start timer T2; The response message that called mobile station is sent is monitored in the base station on the up channel that distributes, if T2 does not receive the response message of called mobile station after overtime, then continue to send the paging control messages; The response of behind the paging number of times that reaches maximum, still not receiving called mobile station sends the link release message then on the down control channel that distributes, for the caller travelling carriage.
Further; Called mobile station is monitored Paging Control Channel in step 4); Handle receiving the paging control messages,, then extract business model parameter and channel configuration information if send to oneself; Forward to according to channel configuration information on the Traffic Channel of distribution, send page-response message.
Further, comprise the address and the response of this called mobile station in the page-response message at least, if called mobile station is supported the business of calling, then response is for just responding; If called mobile station is not supported the business of this calling, then response is a Negative Acknowledgment, and carries the reason of refusal, sent this message after, called mobile station is got back to original state.
Further; In step 5); After the base station receives the page-response message of called mobile station,, called mobile station calls out, then on the down channel that distributes if accepting to be somebody's turn to do; Send link establishment for caller travelling carriage and called mobile station and accomplish message and transmission permission, the indication caller can begin to send professional; If called refusal should be called out, then on the down channel that distributes, send the link release message for the caller travelling carriage, carry the reason that link discharges.
Further, in step 6), after the caller travelling carriage receives the response message that sends the base station; If message is accomplished in link establishment, then begin on the channel that distributes, to send business datum, if the link release message; Then represent the link establishment failure, get back to original state.
A kind of communication link method for building up of GSM is characterized in that: when the caller travelling carriage was directed against a plurality of Mobile Originated group callings or grouies busy, concrete steps did
1) the caller travelling carriage is initiated request for building link through ascending control channel to the base station;
2) base station receives the request of caller travelling carriage, and the distribution service channel also sends and inserts request response;
3) the caller travelling carriage promptly forwards on the Traffic Channel of distribution after receiving this access request response;
4) base station is sent the paging control messages through down channel to called mobile station/travelling carriage group;
5) called mobile station receives after the paging control messages handles, and forwards on the Traffic Channel of distribution, begins to monitor the business information of sending on the channel of distribution.
Further, in step 1), sent request for building link message after, the down control channel that the caller travelling carriage is monitored and ascending control channel matches mutually carries business model parameter and called mobile station/travelling carriage group address in the request for building link information.
Further, in step 1), sent request for building link information after; Start timer T1; If on corresponding down control channel, do not receive the response message of base station in the overtime back of timer T1, then show access failure, the caller travelling carriage is according to the number of times of access attempts at random that disposes and insert handling process at random; Select the rollback time and insert opportunity at random, carry out access attempts once more.
Further; In step 2) in, the base station with down control channel that ascending control channel matches mutually on, send for the caller travelling carriage and insert request response; This inserts in the request response, comprises caller travelling carriage address and channel allocation indication information at least.
Further, in step 4), multiframe paging control messages is repeated to take place through Paging Control Channel in the base station, and this paging control messages comprises business model parameter, called mobile station address and channel allocation indication.
Further, said paging control messages also comprises the caller travelling carriage address that supplies called mobile station identification.
Further; Called mobile station is monitored Paging Control Channel in step 5); Handle receiving the paging control messages,, then extract business model parameter and channel configuration information if send to oneself; Forward to according to channel configuration information on the Traffic Channel of distribution, begin to monitor the business that send the base station on the down channel that distributes.
A kind of frame structure that is applied to the communication link method for building up of above-mentioned arbitrary GSM; It is characterized in that: comprise that 3 continuous ascending time slots, 4 continuous descending time slots, are positioned at the protection time slot of ascending time slot and descending time slot intersection, wherein a descending time slot configuration is broadcast channel or the Paging Control Channel that is used to carry broadcast message or paging control information.
Further, said descending time slot is configured to be used for the downlink traffic channel or the down control channel of bearing downlink business information or Downlink Control Information.
Further, said ascending time slot is configured to be used to carry the reverse link traffic channel or the down control channel of uplink service information or ascending control information.
Can know that by the above-mentioned description of this invention compared with prior art, the present invention has following beneficial effect:
Adopt the link establishing method of GSM of the present invention; The base station is after the request for building link that receives the caller travelling carriage; Give this call distribution up-downgoing channel resource immediately; And channel allocation information sent to the caller travelling carriage through down control channel, when calling out called mobile station through Paging Control Channel also channel allocation information notice called mobile station.Like this, caller and called mobile station can be resident as soon as possible to the channel that distributes, and the ascending control channel of release busy and down control channel are so that the base station utilizes ascending control channel and down control channel to insert or control channel with other travelling carriages again.Simultaneously; Because caller and called is moved to rapidly on the Traffic Channel of distribution; Message transmission between follow-up caller travelling carriage, called mobile station and base station is all carried through the dedicated channel of having distributed; The multi-user can not occur and seize channel and cause collision, more help improving and insert success rate, and greatly reduce access delay, lifting service feature.
Description of drawings
Fig. 1 is the link establishment step sketch map of the DMR system of prior art;
Fig. 2 is a kind of GSM communication link method for building up flow chart of steps of the present invention;
Fig. 3 is a kind of GSM group calling of the present invention or the communication link method for building up flow chart of steps grouied busy;
Fig. 4 is the frame structure of a kind of GSM of the present invention;
Fig. 5 is for adopting the transmission timing figure embodiment of mobile communication link establishing method of the present invention.
Embodiment
Below through embodiment the present invention is done further description.
With reference to Fig. 4, a kind of frame structure that is applied to the communication link method for building up of GSM comprises 7 time slots and a guard time interval GP.Each time slot can be configured to upstream or downstream as required, and a kind of available Slot0, Slot1, Slot2, Slot3 of being configured to is configured to down direction, and slot4, Slot5, Slot6 are configured to up direction.Wherein slot0 is used to carry broadcast channel BCH or paging control channel (PCCH); Slot1, slot2 and slot3 can be used for bearing downlink Traffic Channel DTCH or down control channel DCCH; Slot4, slot5 and slot6 can be used for carrying reverse link traffic channel or ascending control channel UCCH, and initial time slot Slot0 is shorter than other time slot.
In a GSM, comprise one or more base station BSs, the MS that each base station BS can be in the overlay area provides access service.In the time of need carrying out voice or data communication between MS, need to initiate insert request, allocated channel under the control of base station BS just can carry out the transmission of business information after setting up link.For base station BS, after activation, always periodically send broadcast channel BCH, so that the MS in the overlay area can discern the existence of base station BS, through BCH reading system configuration information and resident in network.For the travelling carriage in the paging BS overlay area, in a BS, dispose a PCCH channel, be used for notifying the BS overlay area called travelling carriage access network, set up communication link.When adopting the frame structure of above-mentioned tdma communication system, this PCCH channel and BCH channel are configurable to be in the travelling carriage of idle condition for time division multiplexing slot0 carries out message transmission, always monitors the PCCH channel, to judge whether the beep-page message to oneself.Before travelling carriage will communicate, at first need will insert request and send to base station, request channel through ascending control channel UCCH; After the base station receives the access request of travelling carriage, need to send response message, relevant configuration information is sent to travelling carriage through down control channel DCCH; Therefore in a BS, also need dispose one group of UCCH/DCCH channel at least, wherein the DCCH channel configuration is at descending time slot; The UCCH channel configuration is at ascending time slot, and DCCH and UCCH always match use.
According to the power system capacity demand, a base station BS possibly comprise a plurality of carrier waves, for a carrier wave; Owing to comprise a plurality of time slots (channel) in the frame, in order to improve channel utilization, the elevator system performance; Before travelling carriage communicates; At first need initiate application to the base station, by the base station concentrate carry out the distribution of channel after, could on the channel that distributes, carry out message transmission.
The present invention proposes a kind of communication link method for building up of GSM, and is following with reference to Fig. 2 step:
1) the caller travelling carriage is initiated request for building link through ascending control channel to the base station;
2) base station receives the request of caller travelling carriage, and the distribution service channel also sends and inserts request response;
3) base station is sent the paging control messages through down channel to called mobile station;
4) called mobile station receives after the paging control information handles, and forwards on the Traffic Channel of distribution and sends page-response message;
5) base station is sent link establishment on the down channel that distributes, for caller travelling carriage and called mobile station and is accomplished message and transmission permission after receiving the page-response message of called mobile station on the up channel that distributes;
6) after caller travelling carriage and called mobile station received link establishment completion message, the caller travelling carriage began on the Traffic Channel of distributing, to communicate by letter with called mobile station.
Concrete; In step 1); After having sent request for building link message; The caller travelling carriage is monitored the down control channel that matches mutually with ascending control channel, carries business model parameter and called mobile station address in the request for building link information, and wherein the business model parameter comprises (seeing table 1) such as type of service (voice, data or broadcasting service), service priority.Simultaneously; After having sent request for building link information, start timer T1, if after timer T1 is overtime, on corresponding down control channel, receive the response message of base station; Then show access failure; The caller travelling carriage is according to the number of times of access attempts at random that disposes and insert handling process at random, selects the rollback time and inserts opportunity at random, carries out access attempts once more.
In step 2) in; The base station with down control channel that ascending control channel matches mutually on; Send for the caller travelling carriage and insert request response, this inserts in the request response, comprises (seeing table 2) such as caller travelling carriage address and channel allocation indication informations at least.
In step 3), the base station is sent the paging control messages through Paging Control Channel to called mobile station, and this paging control messages comprises business model parameter, called mobile station address, caller travelling carriage address and channel allocation indication (seeing table 3).Simultaneously; After having sent the paging control messages, start timer T2, the response message that called mobile station is sent is monitored in the base station on the up channel that distributes; If do not receive the response message of called mobile station after T2 is overtime; Then continue to send the paging control messages, the response of behind the paging number of times that reaches maximum, still not receiving called mobile station sends the link release message then on the down control channel that distributes, for the caller travelling carriage.In addition, also through the transmission broadcast message of period of broadcast channel property, so that the travelling carriage in the overlay area can be discerned its existence, time division multiplexing is adopted in the distribution of this broadcast channel and Paging Control Channel in the base station.
Called mobile station is monitored Paging Control Channel in step 4); Handle receiving the paging control messages,, then extract business model parameter and channel configuration information if send to oneself; Forward to according to channel configuration information on the Traffic Channel of distribution, send page-response message.At least the address and the response (seeing table 4) that comprise this called mobile station in the page-response message, if called mobile station is supported the business of calling, then response is for just responding; If called mobile station is not supported the business of this calling, then response is a Negative Acknowledgment, and carries the reason of refusal, sent this message after, called mobile station is got back to original state.
In step 5); After the base station receives the page-response message of called mobile station; If called mobile station is accepted and should be called out; Then on the down channel that distributes, send link establishment for caller travelling carriage and called mobile station and accomplish message (seeing table 5) and transmission permission, the indication caller can begin to send professional; If called refusal should be called out, then on the down channel that distributes, send link release message (seeing table 6) for the caller travelling carriage, carry the reason that link discharges.
In step 6), after the caller travelling carriage receives the response message that sends the base station,, then begin on the channel that distributes, to send business datum if message is accomplished in link establishment, if the link release message is then represented the link establishment failure, get back to original state.
Adopt method of the present invention, this call distribution up-downgoing channel resource is given immediately in the base station after the request for building link that receives the caller travelling carriage; And channel allocation information sent to the caller travelling carriage through down control channel, when calling out called mobile station through Paging Control Channel also channel allocation information notice called mobile station, like this; Caller and called mobile station can be resident as soon as possible to the channel that distributes; The ascending control channel of release busy and down control channel are so that the base station utilizes ascending control channel and down control channel to insert or control channel with other travelling carriages again, simultaneously; Because caller and called is moved to rapidly on the Traffic Channel of distribution; Message transmission between follow-up caller travelling carriage, called mobile station and base station is all carried through the dedicated channel of having distributed, the multi-user can not occur and seize channel and cause collision, more helps improving the access success rate; And greatly reduce access delay, promote service feature.
As a kind of special case; When the Mobile Originated calling of caller is not meant to a called mobile station, but during to a plurality of Mobile Originated group callings or group call service, in order to reduce calling establishment time delay; Can not need this moment called mobile station to respond the base station and send the link establishment page response; Whole call flow is simplified as follows, and as shown in Figure 3, step is following:
1) the caller travelling carriage is initiated request for building link through ascending control channel to the base station;
2) base station receives the request of caller travelling carriage, and the distribution service channel also sends and inserts request response;
3) the caller travelling carriage promptly forwards on the Traffic Channel of distribution after receiving this access request response;
4) base station is sent the paging control messages through down channel to called mobile station/travelling carriage group;
5) called mobile station receives after the paging control messages handles, and forwards on the Traffic Channel of distribution, begins to monitor the business information of sending on the channel of distribution.
Concrete; In step 1); After having sent request for building link message; The caller travelling carriage is monitored the down control channel that matches mutually with ascending control channel, carries business model parameter and called mobile station/travelling carriage group address in the request for building link information, and wherein the business model parameter comprises (seeing table 1) such as type of service (voice, data or broadcasting service), service priority.Simultaneously; After having sent request for building link information, start timer T1, if after timer T1 is overtime, on corresponding down control channel, receive the response message of base station; Then show access failure; The caller travelling carriage is according to the number of times of access attempts at random that disposes and insert handling process at random, selects the rollback time and inserts opportunity at random, carries out access attempts once more.
In step 2) in; The base station with down control channel that ascending control channel matches mutually on; Send for the caller travelling carriage and insert request response (seeing table 2), this inserts in the request response, comprises caller travelling carriage address and channel allocation indication information at least.
In step 4), multiframe paging control messages is repeated to send through Paging Control Channel in the base station, and this paging control messages comprises business model parameter, called mobile station address, caller travelling carriage address and channel allocation indication (seeing table 3).
Called mobile station is monitored Paging Control Channel in step 5); Handle receiving the paging control messages; If send to oneself; Then extract business model parameter and channel configuration information, forward to according to channel configuration information on the Traffic Channel of distribution, begin to monitor the business that send the base station on the down channel that distributes.
Be illustrated in figure 5 as an embodiment transmission timing figure of the communication link method for building up of a kind of GSM of the present invention; In this embodiment; Paging control channel (PCCH) is configured in slot0; Ascending control channel UCCH is configured in slot4, and corresponding down control channel DCCH is configured in slot1.These embodiment concrete steps are following:
1) the caller travelling carriage adopts ascending control channel to initiate request for building link at the slot4 of n frame;
2) after the base station received the request for building link of caller travelling carriage transmission, (in the present embodiment, the channel allocation of this calling was at slot2 and slot5 for this call distribution channel resource; Wherein down channel is configured in slot2; Up channel is configured in slot5), and at the slot0 of n+1 frame, through Paging Control Channel; Send link establishment paging control messages to called mobile station; On slot1, send the access request response to the caller travelling carriage, channel configuration information is sent to the caller travelling carriage;
3) after the caller travelling carriage receives the access request response of sending the base station, forward on the Traffic Channel of configuration; Called mobile station forwards on the Traffic Channel of configuration after receiving the link establishment paging control messages of sending the base station; In the present embodiment, the downlink traffic channel of configuration is mapped in slot2, and the reverse link traffic channel of configuration is mapped in slot5;
4) called mobile station is sent the link establishment page-response message on the reverse link traffic channel of configuration, and expression is accepted and should be called out;
5) after the base station receives the page-response message of called mobile station transmission, at the n+2 frame, send link establishment for caller travelling carriage and called mobile station and accomplish message, the indication link has been set up completion, and caller can begin business information and transmit;
6) after the caller travelling carriage receives link establishment completion message, on the up channel (slot5) that the n+2 frame distributes, beginning transport service information.
Adopt method provided by the invention; Can see, make full use of the advantage of TDMA multi-slot transmission, be under the situation of 45ms at frame length; Send request for building link from the caller travelling carriage and accomplish message to receiving the link establishment of sending the base station; Only need about 81ms, can accomplish the foundation of this link, very little of access delay.
For group-calling service, with reference to figure 5 examples, the caller travelling carriage is after the n frame has sent request for building link; Slot1 at the n+1 frame; The base station has sent the access request response for the caller travelling carriage, and at the slot0 of n+1 frame, sends link establishment paging control messages through Paging Control Channel to the called mobile station group; If it is slot2 and slot5 that the Traffic Channel of this call distribution is given in the base station; Then at the slot5 of n+1 frame, the caller travelling carriage can begin to send business information, the whole link setup delay 30ms that only has an appointment.
Below be the concrete composition of each message of relating in the link establishing method of the present invention
Table 1 request for building link message
Table 2 inserts request response
Table 3 paging control messages
Table 4 page-response message
Message is accomplished in table 5 link establishment
Table 6 link release message
Above-mentionedly be merely an embodiment of the present invention, but design concept of the present invention is not limited thereto, allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection range of the present invention.
Claims (22)
1. the communication link method for building up of a GSM, it is characterized in that: concrete steps are following
1) the caller travelling carriage is initiated request for building link through ascending control channel to the base station;
2) base station receives the request of caller travelling carriage, and the distribution service channel also sends and inserts request response;
3) base station is sent the paging control messages through down channel to called mobile station;
4) called mobile station receives after the paging control information handles, and forwards on the Traffic Channel of distribution and sends page-response message;
5) base station is sent link establishment on the down channel that distributes, for caller travelling carriage and called mobile station and is accomplished message and transmission permission after receiving the page-response message of called mobile station on the up channel that distributes;
6) after caller travelling carriage and called mobile station received link establishment completion message, the caller travelling carriage began on the Traffic Channel of distributing, to communicate by letter with called mobile station.
2. the communication link method for building up of a kind of GSM as claimed in claim 1; It is characterized in that: in step 1); After having sent request for building link message; The caller travelling carriage is monitored the down control channel that matches mutually with ascending control channel, carries business model parameter and called mobile station address in the request for building link information.
3. the communication link method for building up of a kind of GSM as claimed in claim 2 is characterized in that: in step 1), sent request for building link information after; Start timer T1; If on corresponding down control channel, do not receive the response message of base station in the overtime back of timer T1, then show access failure, the caller travelling carriage is according to the number of times of access attempts at random that disposes and insert handling process at random; Select the rollback time and insert opportunity at random, carry out access attempts once more.
4. the communication link method for building up of a kind of GSM as claimed in claim 2; It is characterized in that: in step 2) in; The base station with down control channel that ascending control channel matches mutually on; Send for the caller travelling carriage and insert request response, this inserts in the request response, comprises caller travelling carriage address and channel allocation indication information at least.
5. the communication link method for building up of a kind of GSM as claimed in claim 2; It is characterized in that: in step 3); The base station is sent the paging control messages through Paging Control Channel to called mobile station, and this paging control messages comprises business model parameter, called mobile station address and channel allocation indication.
6. the communication link method for building up of a kind of GSM as claimed in claim 5 is characterized in that: said paging control messages also comprises the caller travelling carriage address that supplies called mobile station identification.
7. like the communication link method for building up of claim 5 or 6 described a kind of GSMs; It is characterized in that: the transmission broadcast message of period of broadcast channel property is also passed through in the base station in step 3); So that the travelling carriage in the overlay area can be discerned its existence, time division multiplexing is adopted in the distribution of this broadcast channel and said Paging Control Channel.
8. the communication link method for building up of a kind of GSM as claimed in claim 7; It is characterized in that: in step 3); After having sent the paging control messages, start timer T2, the response message that called mobile station is sent is monitored in the base station on the up channel that distributes; If do not receive the response message of called mobile station after T2 is overtime; Then continue to send the paging control messages, the response of behind the paging number of times that reaches maximum, still not receiving called mobile station sends the link release message then on the down control channel that distributes, for the caller travelling carriage.
9. like the communication link method for building up of claim 1 or 8 described a kind of GSMs; It is characterized in that: called mobile station is monitored Paging Control Channel in step 4); Handle receiving the paging control messages,, then extract business model parameter and channel configuration information if send to oneself; Forward to according to channel configuration information on the Traffic Channel of distribution, send page-response message.
10. the communication link method for building up of a kind of GSM as claimed in claim 9; It is characterized in that: in step 5); At least the address and the response that comprise this called mobile station in the page-response message, if called mobile station is supported the business of calling, then response is for just responding; If called mobile station is not supported the business of this calling, then response is a Negative Acknowledgment, and carries the reason of refusal, sent this message after, called mobile station is got back to original state.
11. the communication link method for building up of a kind of GSM as claimed in claim 10; It is characterized in that: in step 5); After the base station receives the page-response message of called mobile station,, called mobile station calls out, then on the down channel that distributes if accepting to be somebody's turn to do; Send link establishment for caller travelling carriage and called mobile station and accomplish message and transmission permission, the indication caller can begin to send professional; If called refusal should be called out, then on the down channel that distributes, send the link release message for the caller travelling carriage, carry the reason that link discharges.
12. communication link method for building up like claim 1 or 10 or 11 described a kind of GSMs; It is characterized in that: in step 6), after the caller travelling carriage receives the response message that sends the base station, if message is accomplished in link establishment; Then begin on the channel that distributes, to send business datum; If the link release message is then represented the link establishment failure, get back to original state..
13. the communication link method for building up of a GSM is characterized in that: when the caller travelling carriage was directed against a plurality of Mobile Originated group callings or grouies busy, concrete steps did
1) the caller travelling carriage is initiated request for building link through ascending control channel to the base station;
2) base station receives the request of caller travelling carriage, and the distribution service channel also sends and inserts request response;
3) the caller travelling carriage promptly forwards on the Traffic Channel of distribution after receiving this access request response;
4) base station is sent the paging control messages through down channel to called mobile station/travelling carriage group;
5) called mobile station receives after the paging control messages handles, and forwards on the Traffic Channel of distribution, begins to monitor the business information of sending on the channel of distribution.
14. the communication link method for building up of a kind of GSM as claimed in claim 13; It is characterized in that: in step 1); After having sent request for building link message; The caller travelling carriage is monitored the down control channel that matches mutually with ascending control channel, carries business model parameter and called mobile station/travelling carriage group address in the request for building link information.
15. the communication link method for building up of a kind of GSM as claimed in claim 14 is characterized in that: in step 1), sent request for building link information after; Start timer T1; If on corresponding down control channel, do not receive the response message of base station in the overtime back of timer T1, then show access failure, the caller travelling carriage is according to the number of times of access attempts at random that disposes and insert handling process at random; Select the rollback time and insert opportunity at random, carry out access attempts once more.
16. communication link method for building up like claim 13 or 15 described a kind of GSMs; It is characterized in that: in step 2) in; The base station with down control channel that ascending control channel matches mutually on; Send for the caller travelling carriage and insert request response, this inserts in the request response, comprises caller travelling carriage address and channel allocation indication information at least.
17. the communication link method for building up of a kind of GSM as claimed in claim 16; It is characterized in that: in step 4); Multiframe paging control messages is repeated to take place through Paging Control Channel in the base station, and this paging control messages comprises business model parameter, called mobile station address and channel allocation indication.
18. the communication link method for building up of a kind of GSM as claimed in claim 17 is characterized in that: said paging control messages also comprises the caller travelling carriage address that supplies called mobile station identification.
19. communication link method for building up like claim 13 or 17 or 18 described a kind of GSMs; It is characterized in that: called mobile station is monitored Paging Control Channel in step 5); Handle receiving the paging control messages,, then extract business model parameter and channel configuration information if send to oneself; Forward to according to channel configuration information on the Traffic Channel of distribution, begin to monitor the business information that send the base station on the down channel that distributes.
20. the GSM frame structure in the communication link method for building up that is applied to the described arbitrary GSM of claim 1 to 19; It is characterized in that: comprise that 3 continuous ascending time slots, 4 continuous descending time slots, are positioned at the protection time slot of ascending time slot and descending time slot intersection, wherein a descending time slot configuration is broadcast channel or the Paging Control Channel that is used to carry broadcast message or paging control information.
21. a kind of GSM frame structure as claimed in claim 20 is characterized in that: said descending time slot is configured to be used for the downlink traffic channel or the down control channel of bearing downlink business information or Downlink Control Information.
22. like claim 20 or 21 described a kind of GSM frame structures, it is characterized in that: said ascending time slot is configured to be used to carry the reverse link traffic channel or the down control channel of uplink service information or ascending control information.
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