CN102083013B - Method for realizing trunking traffic and trunking user terminal - Google Patents
Method for realizing trunking traffic and trunking user terminal Download PDFInfo
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Abstract
The invention discloses a method for realizing trunking traffic and a trunking user terminal. The method is realized in a digital trunking communication system based on a time division long term evolution (TD-LTE) technique. In the digital trunking communication system based on the TD-LTE technique, a logical channel and a transmission channel which are used for realizing the trunking traffic are newly added, wherein the logical channel is a trunking paging control channel (TPCCH) and a trunking traffic channel (TTCH), the transmission channel is a trunking paging transmission channel (TPCH), and identifications and mapping approaches which are used for distinguishing the logical channel from the other logical channels are respectively defined for the TPCCH and the TTCH. Through the TPCCH, paging and control messages, such as the call setup, the call release, the discourse right notice and the like of the trunking traffic, are loaded. Through the TTCH, the data messages of the trunking traffic are loaded. By applying the scheme of the invention, call setup time can be shortened, and resource utilization ratio can be increased.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of based on clustering service implementation methods and trunking user terminal in the digital clustering communication system of time-division Long Term Evolution (TD-LTE, Time Division-Long Term Evolution) technology.
Background technology
Owing to possess the characteristics such as distinctive scheduling, group calling and short calling, digital clustering communication system has been brought into play huge effect in the specialized communication field.Since the mid-90 in 20th century, digital clustering communication system is risen in the world, is widely used, and has obtained good economic benefit and social benefit.Existing digital clustering communication system mainly comprises: land trunked radio (TETRA, TerrestrialTrunked Radio) system, integrated digital enhanced network (iDEN, Integrated Digital EnhancedNetworks) system, based on open cluster architecture (GoTa, Global Open Trunking Architecture) system and GT800 system etc.
Group-calling service is the basic service that digital clustering communication system provides.Group-calling service allows trunking user terminal to be established to the group call that belongs to a certain group of trunking user terminal in a certain given area, adopts semiduplex mode; In the group calling communication process, any member all can become the talker in the group, but arbitrary moment only allowed a talker, i.e. caller trunking user terminal, other is the hearer, i.e. called trunking user terminal.Described given area is called group call region, comprises the cluster residential quarter.During the call setup, system is that a group-calling channel is distributed respectively in each residential quarter in the group call region, and wherein up link is only for the caller trunking user terminal, and all called trunking user terminals are monitored down link; Called trunking user terminal can obtain speaking right by the operation of seizing up link.Owing in group-calling service, belong to the shared down link of trunking user terminal in all groups in the same residential quarter, seize up link, therefore can greatly save Radio Resource, improve the availability of frequency spectrum of system.
The another one basic service that digital clustering communication system provides is that broadcast ﹠ call are professional.The professional difference with group-calling service of broadcast ﹠ call only is: in the broadcast ﹠ call business, only have call initiator to talk, other all is the hearer, if call initiator withdraws from calling, then broadcast ﹠ call stop.Broadcast ﹠ call specific implementation process professional and group-calling service is basically identical, repeats no more.
For digital clustering communication system, call set-up time (from initiating a call to the time span that can talk) is important performance index, this time depends primarily on the complexity of trunking user terminal and network side Signalling exchange, and the propagation delay time between each network element device and network element device are to processing mode of signaling etc.Because existing digital clustering communication system is many based on global mobile communication (GSM, Global System forMobile Communications) or code division multiple access (CDMA, Code Division Multiple Access) technology realizes, control need to be unified by base station controller in the base station, can't directly communicate with core net, so the Signalling exchange that causes the group services such as group-calling service and broadcast ﹠ call business to be set up in the process is more, and then cause call set-up time to prolong.In addition, in the existing digital clustering communication system, group service all is carried on circuit domain, therefore can't realize sharing of Traffic Channel, thereby causes resource utilization to reduce.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of clustering service implementation methods, can shorten call set-up time, and can improve resource utilization.
Another object of the present invention is to provide a kind of trunking user terminal, can shorten call set-up time, and can improve resource utilization.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of clustering service implementation methods, the method realizes in the digital clustering communication system based on time-division Long Term Evolution TD-LTE technology, described based on the digital clustering communication system of TD-LTE technology in newly-increased logic channel and the transmission channel that is used for realizing group service, described logic channel is clustered paging control channel TPCCH and group service channel TTCH, described transmission channel is clustered paging transmission channel TPCH, for described TPCCH channel and TTCH channel define respectively be used to the sign that is different from other logic channel; In addition, the mapping approach that defines described TPCCH channel is: TPCCH channel-TPCH channel-Physical Downlink Shared Channel PDSCH, and the mapping approach that defines described TTCH channel is: TTCH channel-DSCH Downlink Shared Channel DL-SCH-PDSCH channel; The method comprises:
Each trunking user terminal is in the physical downlink control channel PDCCH that periodically detects on the position of appointment after carrying out the cyclic redundancy check (CRC) scrambling with the sign of described TPCCH channel;
If carry the schedule information of described TPCCH channel on the described PDCCH channel, then search the transmission block TB that is carried on the information that comprises described TPCCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds deciphered, obtain the information of described TPCCH channel bearing;
According to the information that obtains, each trunking user terminal is judged respectively the member who self whether belongs in the current group service of initiating, and if so, then sets up the service plane passage of group service;
The service plane passage that the utilization of caller trunking user terminal is set up is initiated speech;
PDCCH channel after called trunking user terminal detects in each Transmission Time Interval TTI and carries out the CRC scrambling with the sign of described TTCH channel, and when detecting described PDCCH channel and carry the schedule information of described TTCH channel, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds is deciphered.
Described TPCCH channel be designated clustered paging Radio Network Temporary Identifier TP-RNTI; Described TTCH channel be designated group service Radio Network Temporary Identifier G-RNTI.
The described service plane passage of setting up comprises: set up TTCH channel relevant entity and context, the entity that described TTCH channel is relevant comprises: PDCP PDCP entity, radio link control RLC entity, MAC layer MAC entity and physical layer PHY entity.
Describedly search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and after the TB that finds deciphered, further comprise:
Periodically detect with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the described TTCH channel that detects, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel, and the TB that finds is deciphered.
The method further comprises:
After the right of speech of described caller trunking user terminal is preempted, all called trunking user terminals again detect in each TTI with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and when detecting described PDCCH channel and carry the schedule information of described TTCH channel, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds is deciphered;
Afterwards, periodically detect with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the described TTCH channel that detects, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel, and the TB that finds is deciphered.
Described each trunking user terminal further comprised before the PDCCH channel that periodically detects on the position of appointment after carrying out the CRC scrambling with the sign of described TPCCH channel:
The base station is notified send opportunity and the transmission cycle of TPCCH channel to each trunking user terminal by broadcast; Described send opportunity is the transmission positional information of TPCCH channel.
Described transmission positional information is for sending used radio frames and the sub-frame information of described TPCCH channel; Described subframe is the P0 subframe.
A kind of trunking user terminal, described trunking user terminal is applied in the digital clustering communication system based on time-division Long Term Evolution TD-LTE technology, described based on newly-increased logic channel and the transmission channel of realizing group service that be useful in the digital clustering communication system of TD-LTE technology, described logic channel is clustered paging control channel TPCCH and group service channel TTCH, described transmission channel is clustered paging transmission channel TPCH, and described TPCCH channel and TTCH channel define respectively the sign that is useful on other logic channel of difference; In addition, the mapping approach that defines described TPCCH channel is: TPCCH channel-TPCH channel-Physical Downlink Shared Channel PDSCH, and the mapping approach that defines described TTCH channel is: TTCH channel-DSCH Downlink Shared Channel DL-SCH-PDSCH channel: described trunking user terminal comprises:
Detecting unit, be used in the physical downlink control channel PDCCH that periodically detects on the position of appointment after carrying out the cyclic redundancy check (CRC) scrambling with the sign of described TPCCH channel, if carry the schedule information of described TPCCH channel on the described PDCCH channel, then search the transmission block TB that is carried on the information that comprises described TPCCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds deciphered, obtain the information of described TPCCH channel bearing;
Judging unit is used for according to the information that obtains, and judges that the trunking user terminal at place is caller trunking user terminal or called trunking user terminal, and judged result is notified to performance element;
Described performance element, be used for when the trunking user terminal at place is the caller trunking user terminal, utilize the service plane passage of setting up to initiate speech, when the trunking user terminal at place is called trunking user terminal, PDCCH channel after detection is carried out the CRC scrambling with the sign of described TTCH channel in each Transmission Time Interval TTI, and when detecting described PDCCH channel and carry the schedule information of described TTCH channel, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds is deciphered.
Described TPCCH channel be designated clustered paging Radio Network Temporary Identifier TP-RNTI; Described TTCH channel be designated group service Radio Network Temporary Identifier G-RNTI.
Described performance element is further used for, when described trunking user terminal is called trunking user terminal, after the TB that finds is deciphered, periodically detect with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the described TTCH channel that detects, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel, and the TB that finds is deciphered.
As seen, adopt technical scheme of the present invention, newly-increased logic channel TPCCH and TTCH and the transmission channel TPCH that is used for realizing group service in based on the digital clustering communication system of TD-LTE technology, and define respectively be used to the sign that is different from other logic channel and mapping approach for TPCCH channel and TTCH channel; Come the bearing cluster service call setup, call out paging and the control informations such as release and right of speech notice by the TPCCH channel, come the bearing cluster service data message by the TTCH channel.Compared with prior art, group service of the present invention is carried in the packet domain, therefore can be completely achieved sharing of Traffic Channel, thereby greatly improves the utilance of resource; In addition, the TD-LTE technology adopts the all-IP flattening network architecture, the base station directly links to each other with core net, therefore the network side interior signaling interaction in the call establishment reduces, and, by newly-increased logic channel and transmission channel, the Paging Control Channel cycle of air interface can be set as required, therefore greatly shortened call set-up time.
Description of drawings
Fig. 1 is existing network architecture schematic diagram based on TD-LTE wideband digital trunked communication system.
Fig. 2 is that the downlink map that the present invention is based in the digital clustering communication system of TD-LTE technology concerns schematic diagram.
Fig. 3 is the flow chart of clustering service implementation methods embodiment of the present invention.
Fig. 4 is the composition structural representation of trunking user terminal embodiment of the present invention.
Embodiment
For problems of the prior art, a kind of brand-new group service implementation is proposed among the present invention, the TD-LTE technology is incorporated in the digital clustering communication system, thereby obtain the digital clustering communication system based on the TD-LTE technology, and realize group service based on this digital clustering communication system.
Fig. 1 is for having the network architecture schematic diagram based on the digital clustering communication system of TD-LTE technology now.As shown in Figure 1, comprising: trunking user terminal, cluster broadband wireless access subsystem and cluster network subsystem etc.
Wherein, trunking user terminal links to each other with cluster broadband wireless access subsystem or cluster network subsystem by air interface etc., for the user provides various PTTs (PTT, Push-To-Talk) speech business, broadband Cluster Multimedia business and scheduling feature.Described trunking user terminal comprises portable terminal, fixed station and dispatching desk etc.; Further, portable terminal also comprises hand held mobile station and Vehicle mounted station, and dispatching desk also comprises wireless dispatching desk and wired dispatching desk.
Cluster broadband wireless access subsystem is comprised of a plurality of enhancement mode eNodeB (E-eNodeB).Wireless colony scheduling feature module (RTDF among the E-eNodeB, Radio Trunking DispatchFunction) relevant treatment of group service among the responsible E-eNodeB, as, from enhancement mode mobile management entity (MME, Mobility Management Entity) (eMME) receives the cluster control signal, be called trunking user terminal place cell allocation down link shared resource, to be sent to called trunking user terminal etc. from the group service data flow that gateway (S-GW, ServingGateway) receives.
Comprise eMME, S-GW, enhanced packet data network gateway (P-GW in the cluster network subsystem, PDN Gateway) (eP-GW), enhancement mode home subscriber server (HSS, Home Subscriber Server) (eHSS) and the scheduling gateway (D-GW, Dispatch Gateway).Wherein, cluster control functional module (TCF among the eMME, Trunking Control Function) is the control centre that realizes trunked call, is responsible for the authentication of cluster user and the mandate of group service, set up the carrying of transmit traffic data stream for the user of authentication success; Cluster block functions module (TPF among the eP-GW, Trunking Packet Function) be used for finishing the group service data flow mapping, copy and distribute, and according to the business characteristic of user's request and the foundation of service quality (QoS, Quality of Service) demand initiation service bearer; Cluster user server among the eHSS (TSS, Trunking Subscriber Server) is used for the store and management group user profile relevant with group service; D-GW is the gateway of wired dispatching desk access set group network subsystem, is responsible for the authentication of wired dispatching desk, the signaling between wired dispatching desk and the cluster network subsystem and the transmission of business datum; In addition, D-GW also is responsible for realizing interconnecting of this group system and other group system.
After adopting digital clustering communication system shown in Figure 1, group service will be carried in the packet domain, therefore can be completely achieved sharing of Traffic Channel, thereby will greatly improve resource utilization, and then reduce the operation cost of digital clustering communication system.And because the TD-LTE technology adopts the all-IP flattening network architecture, the base station directly links to each other with core net, so the minimizing of the network side interior signaling interaction in the call establishment, and call set-up time is shortened.
But, also can there be certain problem in digital clustering communication system shown in Figure 1 in actual applications, such as: although the network architecture of TE-LTD technology can make call set-up time shorten, but in the TD-LTE technology, the Paging Control Channel cycle of air interface is longer, and can not revise, therefore, cause call set-up time still longer; In addition, existing TD-LTE technology designs for point-to-point communication service, and group service is a kind of business of point-to-multipoint, therefore can't directly be applied in the group service having the TD-LTE technology now.
, in the scheme of the present invention, the air interlace channel in the existing TD-LTE technology is made amendment for this reason, increase new logic channel and new transmission channel.Stipulate in the air interface protocol of TD-LTE technology, by MAC layer (MAC, MediaAccess Control) provide data transport services on the logic channel, different data transport services kind (point-to-point and point-to-multipoint etc.) needs corresponding different logical channel type.Therefore, in the scheme of the present invention, characteristics for the group service point-to-multipoint, newly-increased be used for carrying the group service call setup, call out and discharge and the descending logic channel of the paging such as right of speech notice and control information, be defined as clustered paging control channel (TPCCH, Trunking Paging ControlChannel), and the newly-increased descending logic channel that is used for transmitting the group service data message, be defined as group service channel (TTCH, Trunking Traffic Channel).In addition, transmission channel is used for the business information that carrying is provided by physical layer, it is transferred to MAC layer and high level, what describe is the feature of transfer of data on the air interface, in the scheme of the present invention, according to the characteristics of TPCCH channel, the newly-increased transmission channel that is used for carrying TPCCH channel, be defined as clustered paging transmission channel (TPCH, Trunking Paging Channel).The TPCH channel need to have following characteristics: it can be dynamic broadcasting, be mapped to physical resource in whole group of overlay area of residential quarter, and supports discontinuous reception (DRX, Discontinuous Reception) pattern etc.Can send opportunity and the transmission cycle of TPCCH channel be notified to each trunking user terminal by system broadcast message, so, the Paging Control Channel cycle that is used for group service of air interface can arrange arbitrarily as required, thereby has shortened the call set-up time of group service.
Fig. 2 is that the downlink map that the present invention is based in the digital clustering communication system of TD-LTE technology concerns schematic diagram.As shown in Figure 2, the mapping approach of TPCCH channel is: TPCCH channel-TPCH channel-Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel), the mapping approach of TTCH channel is: TTCH channel-DSCH Downlink Shared Channel (DL-SCH, Downlink shared channel)-PDSCH channel.The effect of other channel shown in Figure 2 and mapping relations are known in this field, repeat no more; In addition, identical in uplink map relation and the prior art.
Stipulate in the air interface protocol of TD-LTE technology, dissimilar logic channels need to pass through Radio Network Temporary Identifier (RNTI, Radio Network Temporary Identifier) distinguishes, such as Paging Control Channel (PCCH, Paging control channel) utilize paging RNTI (P-RNTI) to distinguish, Dedicated Traffic Channel (DTCH, Dedicated Traffic Channel) utilizes residential quarter RNTI (C-RNTI) to distinguish; For newly-increased TPCCH channel and TTCH channel, need to be the corresponding sign of its definition equally, in order to distinguish with other logic channel, stipulate in the scheme of the present invention, utilize clustered paging RNTI (TP-RNTI) to come the TPCCH channel is distinguished, utilize group service RNTI (G-RNTI) to come the TTCH channel is distinguished.
Based on above-mentioned introduction, Fig. 3 is the flow chart of clustering service implementation methods embodiment of the present invention.As shown in Figure 3, may further comprise the steps:
Step 31: each trunking user terminal periodically detects on the position of appointment with TP-RNTI sign and carries out PDCCH channel after cyclic redundancy check (CRC) (CRC, the Cyclic Redundancy Check) scrambling.
In actual applications, the base station can be passed through broadcast in advance, the TPCCH channel information is informed each cluster user in send opportunity and the transmission cycle of network side, described send opportunity refers to the transmission positional information of TPCCH channel, be about to the TPCCH channel bearing and in which subframe of which radio frames (being the PF frame) send, described subframe is generally the P0 subframe.Follow-up, when the informational needs that the TPCCH channel bearing is arranged sent, the base station namely can send in the position of above-mentioned appointment (on the follow-up PDSCH of the being mapped to channel).
After each cluster user receives the broadcast that the base station sends, at the PDCCH channel that periodically detects on the position of appointment after carrying out the CRC scrambling with the TP-RNTI sign; Carry the schedule information of TPCCH channel on the PDCCH channel, be used to indicate the position of transmission block (TB, Transport Block) on the PDSCH channel of the information that comprises the TPCCH channel bearing.
Step 32: if carry the schedule information of TPCCH channel on the PDCCH channel, then find the TB that is carried on the information that comprises the TPCCH channel bearing on the PDSCH channel according to described schedule information.
In this step, if determine to carry on the PDCCH channel schedule information of TPCCH channel, then each trunking user terminal utilizes known TP-RNTI that described schedule information is carried out the CRC descrambling, get access to the positional information of TB on the PDSCH channel of the information that comprises the TPCCH channel bearing, and find TB corresponding to TPCCH channel according to the positional information that gets access to.How trunking user terminal knows that TP-RNTI is known in this field, repeats no more.
Step 33: the TB that finds is deciphered.
In this step, trunking user terminal is deciphered the TB that finds, and with the result of decoding success, namely MAC Packet Data Unit (PDU, Packet Data Unit) is transferred to high level.How to be decoded as prior art, to repeat no more.If decoding failure then abandons the TB that finds.
Step 34: according to decode results, the high level of each trunking user terminal is judged respectively the member who self whether belongs in the current group service of initiating, and if so, then sets up the service plane passage of group service.
To carry the information such as the group ID of group service and G-RNTI sign among the MAC PDU of correct decoding, because it is known in advance self belonging to which group, so, each trunking user terminal can be determined the member who self whether belongs in the current group service of initiating by the group id information, if, then set up the service plane passage of group service, otherwise, the MAC PDU that receives abandoned; The G-RNTI sign is used for illustrating the TTCH channel that current group service of initiating is corresponding.
Wherein, setting up the service plane passage comprises: set up TTCH channel relevant entity and context; The entity that described TTCH channel is relevant comprises: PDCP (PDCP, Packet DataConvergence Protocol) entity, radio link control (RLC, Radio Link Control) entity, MAC entity and physical layer (PHY, Physical) entity.How to be established as known in this fieldly, to repeat no more.
Step 35: the service plane passage that the utilization of caller trunking user terminal is set up is initiated speech; Called trunking user terminal is at each Transmission Time Interval (TTI, Transmission Time Interval) detects in G-RNTI and carry out PDCCH channel after the CRC scrambling, if detect the schedule information that carries the TTCH channel on the PDCCH channel, then search the TB that is carried on the information that comprises the TTCH channel bearing on the PDSCH channel according to described schedule information, and the TB that finds is deciphered.
After correctly receiving the TPCCH channel information, the calling and called trunking user terminal can begin to upload or receive the group service data message.Specifically, the service plane passage that the utilization of caller trunking user terminal is set up is initiated speech, called trunking user terminal then detects in each TTI with G-RNTI and carries out PDCCH channel after the CRC scrambling, if the descending assignation information at certain TTI detects the schedule information that the PDCCH channel carries the TTCH channel, then utilize the G-RNTI descrambling that gets access in the step 34 to go out this schedule information, and search the TB that is carried on the information that comprises the TTCH channel bearing on the PDSCH channel according to this schedule information, and the TB that finds deciphered, with the result of decoding success, the MAC PDU that namely carries the group service data message is transferred to high level.
Follow-up, periodicity based on group service, for saving electric weight, each called trunking user terminal can all not detect each TTI, carry out PDCCH channel after the CRC scrambling but periodically detect with G-RNTI sign, and according to the schedule information of the TTCH channel that detects, search the TB that is carried on the information that comprises the TTCH channel bearing on the PDSCH channel, the TB that finds is deciphered, the result of decoding success is transferred to high level.
That is to say that called trunking user terminal is after detecting first the PDCCH channel, follow-up can all the detection each TTI again, but have periodic characteristics according to group service detected the PDCCH channel in the same position of next cycle and got final product.
In addition, after the right of speech of caller trunking user terminal is preempted, all called trunking user terminals, comprise original caller trunking user terminal and other called user terminal except the called user terminal of seizing right of speech, again in each TTI, detect with the G-RNTI sign and carry out PDCCH channel after the CRC scrambling, if detect the schedule information that carries the TTCH channel on the PDCCH channel, then search the TB that is carried on the information that comprises the TTCH channel bearing on the PDSCH channel according to this schedule information, and the TB that finds deciphered, the result of decoding success is transferred to high level; Afterwards, periodically detect with G-RNTI sign and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the TTCH channel that detects, search the TB that is carried on the information that comprises the TTCH channel bearing on the PDSCH channel, the TB that finds is deciphered, the result of decoding success is transferred to high level.
Based on said method, Fig. 4 is the composition structural representation of trunking user terminal embodiment of the present invention.This trunking user terminal is applied in the digital clustering communication system based on the TD-LTE technology, described based on newly-increased logic channel and the transmission channel of realizing group service that be useful in the digital clustering communication system of TD-LTE technology, described logic channel is TPCCH channel and TTCH channel, described transmission channel is the TPCH channel, and described TPCCH channel and TTCH channel define respectively and be useful on the sign that is different from other logic channel; In addition, the mapping approach of definition of T PCCH channel is: TPCCH channel-TPCH channel-PDSCH channel, the mapping approach of TTCH channel is: TTCH channel-DL-SCH channel-PDSCH channel.As shown in Figure 4, described trunking user terminal comprises:
Detecting unit 41, be used at the PDCCH channel that periodically detects on the position of appointment after carrying out the CRC scrambling with the sign of TPCCH channel, if carry the schedule information of TPCCH channel on the PDCCH channel, then search the TB that is carried on the information that comprises the TPCCH channel bearing on the PDSCH channel according to this schedule information, and the TB that finds deciphered, obtain the information of TPCCH channel bearing;
Judging unit 42 is used for according to the information that obtains, and the trunking user terminal of determining the place is caller trunking user terminal or called trunking user terminal, and judged result is notified to performance element 43;
Wherein, the TPCCH channel be designated TP-RNTI, the TTCH channel be designated G-RNTI.
In addition, performance element 43 also can be further used for, when the trunking user terminal at place is called trunking user terminal, after the TB that finds is deciphered, periodically detect with the sign of TTCH channel and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the TTCH channel that detects, search the TB that is carried on the information that comprises the TTCH channel bearing on the PDSCH channel, and the TB that finds is deciphered.
The specific works flow process of device embodiment shown in Figure 4 please refer to the respective description in the embodiment of the method shown in Figure 3, repeats no more herein.
In a word, adopt technical scheme of the present invention, not only can shorten call set-up time, and can improve resource utilization.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. clustering service implementation methods, it is characterized in that, the method realizes in the digital clustering communication system based on time-division Long Term Evolution TD-LTE technology, described based on the digital clustering communication system of TD-LTE technology in newly-increased logic channel and the transmission channel that is used for realizing group service, described logic channel is clustered paging control channel TPCCH and group service channel TTCH, described transmission channel is clustered paging transmission channel TPCH, for described TPCCH channel and TTCH channel define respectively be used to the sign that is different from other logic channel; In addition, the mapping approach that defines described TPCCH channel is: TPCCH channel-TPCH channel-Physical Downlink Shared Channel PDSCH, and the mapping approach that defines described TTCH channel is: TTCH channel-DSCH Downlink Shared Channel DL-SCH channel-PDSCH channel; The method comprises:
Each trunking user terminal is in the physical downlink control channel PDCCH that periodically detects on the position of appointment after carrying out the cyclic redundancy check (CRC) scrambling with the sign of described TPCCH channel;
If carry the schedule information of described TPCCH channel on the described PDCCH channel, then search the transmission block TB that is carried on the information that comprises described TPCCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds deciphered, obtain the information of described TPCCH channel bearing;
According to the information that obtains, each trunking user terminal is judged respectively the member who self whether belongs in the current group service of initiating, and if so, then sets up the service plane passage of group service;
The service plane passage that the utilization of caller trunking user terminal is set up is initiated speech;
PDCCH channel after called trunking user terminal detects in each Transmission Time Interval TTI and carries out the CRC scrambling with the sign of described TTCH channel, and when detecting described PDCCH channel and carry the schedule information of described TTCH channel, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds is deciphered.
2. method according to claim 1 is characterized in that, described TPCCH channel be designated clustered paging Radio Network Temporary Identifier TP-RNTI; Described TTCH channel be designated group service Radio Network Temporary Identifier G-RNTI.
3. method according to claim 1, it is characterized in that, the described service plane passage of setting up comprises: set up TTCH channel relevant entity and context, the entity that described TTCH channel is relevant comprises: PDCP PDCP entity, radio link control RLC entity, MAC layer MAC entity and physical layer PHY entity.
4. method according to claim 1 is characterized in that, describedly searches the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and after the TB that finds deciphered, further comprises:
Periodically detect with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the described TTCH channel that detects, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel, and the TB that finds is deciphered.
5. method according to claim 4 is characterized in that, the method further comprises:
After the right of speech of described caller trunking user terminal is preempted, all called trunking user terminals again detect in each TTI with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and when detecting described PDCCH channel and carry the schedule information of described TTCH channel, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds is deciphered;
Afterwards, periodically detect with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the described TTCH channel that detects, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel, and the TB that finds is deciphered.
6. each described method is characterized in that according to claim 1～5, and described each trunking user terminal further comprised before the PDCCH channel that periodically detects on the position of appointment after carrying out the CRC scrambling with the sign of described TPCCH channel:
The base station is notified send opportunity and the transmission cycle of TPCCH channel to each trunking user terminal by broadcast; Described send opportunity is the transmission positional information of TPCCH channel.
7. method according to claim 6 is characterized in that, described transmission positional information is for sending used radio frames and the sub-frame information of described TPCCH channel; Described subframe is the P0 subframe.
8. trunking user terminal, it is characterized in that, described trunking user terminal is applied in the digital clustering communication system based on time-division Long Term Evolution TD-LTE technology, described based on newly-increased logic channel and the transmission channel of realizing group service that be useful in the digital clustering communication system of TD-LTE technology, described logic channel is clustered paging control channel TPCCH and group service channel TTCH, described transmission channel is clustered paging transmission channel TPCH, and described TPCCH channel and TTCH channel define respectively the sign that is useful on other logic channel of difference; In addition, the mapping approach that defines described TPCCH channel is: TPCCH channel-TPCH channel-Physical Downlink Shared Channel PDSCH, and the mapping approach that defines described TTCH channel is: TTCH channel-DSCH Downlink Shared Channel DL-SCH channel-PDSCH channel: described trunking user terminal comprises:
Detecting unit, be used in the physical downlink control channel PDCCH that periodically detects on the position of appointment after carrying out the cyclic redundancy check (CRC) scrambling with the sign of described TPCCH channel, if carry the schedule information of described TPCCH channel on the described PDCCH channel, then search the transmission block TB that is carried on the information that comprises described TPCCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds deciphered, obtain the information of described TPCCH channel bearing;
Judging unit is used for according to the information that obtains, and judges that the trunking user terminal at place is caller trunking user terminal or called trunking user terminal, and judged result is notified to performance element;
Described performance element, be used for when the trunking user terminal at place is the caller trunking user terminal, utilize the service plane passage of setting up to initiate speech, when the trunking user terminal at place is called trunking user terminal, PDCCH channel after detection is carried out the CRC scrambling with the sign of described TTCH channel in each Transmission Time Interval TTI, and when detecting described PDCCH channel and carry the schedule information of described TTCH channel, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel according to described schedule information, and the TB that finds is deciphered.
9. trunking user terminal according to claim 8 is characterized in that, described TPCCH channel be designated clustered paging Radio Network Temporary Identifier TP-RNTI; Described TTCH channel be designated group service Radio Network Temporary Identifier G-RNTI.
10. trunking user terminal according to claim 8, it is characterized in that, described performance element is further used for, when described trunking user terminal is called trunking user terminal, after the TB that finds is deciphered, periodically detect with the sign of described TTCH channel and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of the described TTCH channel that detects, search the TB that is carried on the information that comprises described TTCH channel bearing on the described PDSCH channel, and the TB that finds is deciphered.
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