CN102083013A - 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 cluster 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 characteristics such as distinctive scheduling, group calling and short calling, digital clustering communication system has been brought into play enormous function in the specialized communication field.Since the mid-90 in 20th century, digital clustering communication system is risen in the world, has obtained using widely, and has obtained good economic benefit and social benefit.Existing digital clustering communication system mainly comprises: land trunked radio (TETRA, Terrestrial Trunked Radio) system, integrated digital enhanced network (iDEN, Integrated Digital Enhanced Networks) 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 the cluster user terminal to be established to the group call that belongs to a certain group of cluster 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 allow a talker, i.e. caller cluster user terminal, other is the hearer, promptly called cluster user terminal.Described given area is called group call region, comprises the cluster sub-district.During the call setup, system is that each sub-district in the group call region is distributed a group-calling channel respectively, and wherein up link is only used for caller cluster user terminal, all called cluster user terminal monitoring down links; Called cluster user terminal can be obtained speaking right by the operation of seizing up link.Owing in group-calling service, belong to the shared down link of cluster user terminal in all groups in the same sub-district, seize up link, therefore can save Radio Resource greatly, improve the availability of frequency spectrum of system.
The another one basic service that digital clustering communication system provides is the broadcast ﹠ call business.The professional difference with group-calling service of broadcast ﹠ call only is: in the broadcast ﹠ call business, have only call initiator to talk, other all is the hearer, if call initiator withdraws from calling, then broadcast ﹠ call stop.The specific implementation process basically identical of broadcast ﹠ call business and group-calling service 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 cluster user terminal and network side Signalling exchange, and 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 for Mobile Communications) or code division multiple access (CDMA, Code Division Multiple Access) technology realizes, control need be unified by base station controller in the base station, can't directly communicate with core net, therefore the Signalling exchange that causes group services such as group-calling service and broadcast ﹠ call business to be set up in the process is more, and then causes 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 cluster 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, this 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 to realize 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 the sign that is used to be different from other logic channel respectively; 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; This method comprises:
Each cluster user terminal is in the physical downlink control channel PDCCH that periodically detects on the appointed positions 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 of Information piece TB that comprises described TPCCH channel bearing that is carried 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 cluster user terminal is judged the member who self whether belongs in the current group service of initiating respectively, if then set up the service plane passage of group service;
The service plane passage that the utilization of caller cluster user terminal is set up is initiated speech;
PDCCH channel after called cluster user terminal detects in each Transmission Time Interval TTI and carries out the CRC scrambling with the sign of described TTCH channel, and when on detecting described PDCCH channel, carrying 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, and after the TB that finds deciphered, further comprise according to described schedule information:
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 detected described TTCH channel, 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.
This method further comprises:
After the right of speech of described caller cluster user terminal is seized, all called cluster user terminals detect in each TTI again with the sign of described TTCH channel carries out PDCCH channel after the CRC scrambling, and when on detecting described PDCCH channel, carrying 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 detected described TTCH channel, 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 cluster user terminal further comprised before the PDCCH channel that periodically detects on the appointed positions after carrying out the CRC scrambling with the sign of described TPCCH channel:
The base station is notified to each cluster user terminal by broadcast with the send opportunity and transmission cycle of TPCCH channel; 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 cluster user terminal, described cluster user terminal applies is 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 the sign that is useful on other logic channel of difference respectively; 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 cluster user terminal comprises:
Detecting unit, be used in the physical downlink control channel PDCCH that periodically detects on the appointed positions 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 of Information piece TB that comprises described TPCCH channel bearing that is carried 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 cluster user terminal at place is that caller cluster user terminal still is called cluster user terminal, and judged result is notified to performance element;
Described performance element, be used for when the cluster user terminal at place is caller cluster user terminal, utilize the service plane passage of being set up to initiate speech, when the cluster user terminal at place is called cluster 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 on detecting described PDCCH channel, carrying 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 cluster user terminal is called cluster 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 detected described TTCH channel, 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 to realize group service in based on the digital clustering communication system of TD-LTE technology, and define sign and the mapping approach that is used to be different from other logic channel respectively for TPCCH channel and TTCH channel; Come the bearing cluster service call setup, call out paging and 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 improves the utilance of resource greatly; 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 shortened call set-up time greatly.
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 cluster user terminal embodiment of the present invention.
Embodiment
At 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 digital clustering communication system, and realize group service based on this digital clustering communication system based on the TD-LTE technology.
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: cluster user terminal, cluster broadband wireless access subsystem and cluster network subsystem etc.
Wherein, the cluster 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 service and scheduling feature.Described cluster user terminal comprises portable terminal, fixed station and dispatching desk etc.; Further, portable terminal also comprises hand-held travelling carriage and Vehicle mounted station, and dispatching desk also comprises wireless dispatching platform and wired dispatching desk.
Cluster broadband wireless access subsystem is made up of a plurality of enhancement mode eNodeB (E-eNodeB).Wireless colony scheduling feature module (RTDF among the E-eNodeB, Radio Trunking Dispatch Function) relevant treatment of group service among the responsible E-eNodeB, as, from enhancement mode mobile management entity (MME, Mobility Management Entity) (eMME) receives cluster and control signaling, be called cluster user terminal place cell allocation down link shared resource, to be sent to called cluster user terminal etc. from the group service data flow that gateway (S-GW, Serving Gateway) 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 function 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 to finish the group service data flow mapping, duplicate 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 to store the group user profile relevant with group service with management; 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 improve resource utilization greatly, 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: though 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 at 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 at the group service point-to-multipoint, newly-increased be used to carry the group service call setup, call out and discharge and the descending logic channel of paging such as right of speech notice and control information, be defined as clustered paging control channel (TPCCH, Trunking Paging Control Channel), and the newly-increased descending logic channel that is used to transmit the group service data message, be defined as group service channel (TTCH, Trunking Traffic Channel).In addition, transmission channel is used to carry the business information that 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 to carry the TPCCH channel, be defined as clustered paging transmission channel (TPCH, Trunking Paging Channel).The TPCH channel need have following feature: it can be dynamic broadcasting, be mapped to physical resource in whole group of overlay area of sub-district, and supports discontinuous reception (DRX, Discontinuous Reception) pattern etc.Can the send opportunity and transmission cycle of TPCCH channel be notified to each cluster user terminal by system broadcast message, so, the Paging Control Channel cycle that is used for group service of air interface can be provided with 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 pass through Radio Network Temporary Identifier (RNTI, Radio Network Temporary Identifier) distinguishes, as Paging Control Channel (PCCH, Paging control channel) utilize paging RNTI (P-RNTI) to distinguish, Dedicated Traffic Channel (DTCH, Dedicated Traffic Channel) utilizes sub-district RNTI (C-RNTI) to distinguish; For newly-increased TPCCH channel and TTCH channel, need be the corresponding sign of its definition equally, so that 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 cluster user terminal periodically detects on appointed positions with TP-RNTI sign 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 the send opportunity and the transmission cycle of network side, described send opportunity is meant the transmission positional information of TPCCH channel, be about to the TPCCH channel bearing and send on which subframe of which radio frames (being the PF frame), described subframe is generally the P0 subframe.Follow-up, when the informational needs of TPCCH channel bearing sent, the base station promptly can send (on the follow-up PDSCH of the being mapped to channel) on the above-mentioned appointed positions.
After each cluster user receives the broadcast that the base station sends, at the PDCCH channel that periodically detects on the appointed positions 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 of Information piece (TB, Transport Block) on the PDSCH channel that comprises the TPCCH channel bearing.
Step 32:, 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 if carry the schedule information of TPCCH channel on the PDCCH channel.
In this step, if determine to carry on the PDCCH channel schedule information of TPCCH channel, then each cluster 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 the TB of TPCCH channel correspondence according to the positional information that gets access to.How the cluster 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, the cluster user terminal is deciphered the TB that finds, and with the result of decoding success, promptly 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 cluster user terminal is judged the member who self whether belongs in the current group service of initiating respectively, if then set up the service plane passage of group service.
To carry 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 cluster 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 to illustrate the TTCH channel of the current group service correspondence of initiating.
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 Data Convergence 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 cluster user terminal is set up is initiated speech; Called cluster 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, and the TB that finds is deciphered according to described schedule information.
After correctly receiving the TPCCH channel information, calling and called cluster user terminal can begin to upload or receive the group service data message.Specifically, the service plane passage that the utilization of caller cluster user terminal is set up is initiated speech, called cluster user terminal then detects in each TTI with G-RNTI carries out PDCCH channel after the CRC scrambling, if on the descending assignation information of certain TTI, detect the schedule information that carries the TTCH channel on the PDCCH 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 promptly carries the group service data message is transferred to high level.
Follow-up, periodicity based on group service, for saving electric weight, each called cluster user terminal can all not detect each TTI, carry out PDCCH channel after the CRC scrambling but periodically detect, and, search the TB that is carried on the information that comprises the TTCH channel bearing on the PDSCH channel according to the schedule information of detected TTCH channel with G-RNTI sign, the TB that finds is deciphered, give the result transmission of decoding success high-rise.
That is to say that called cluster user terminal is after detecting the PDCCH channel first, 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 cluster user terminal is seized, all called cluster user terminals, comprise original caller cluster user terminal and other called user terminal except that 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, give the result transmission of decoding success high-rise; Afterwards, periodically detect with G-RNTI sign and carry out PDCCH channel after the CRC scrambling, and according to the schedule information of detected TTCH channel, 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, give the result transmission of decoding success high-rise.
Based on said method, Fig. 4 is the composition structural representation of cluster user terminal embodiment of the present invention.This cluster user terminal applies is 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 cluster user terminal comprises:
Detecting unit 41, be used at the PDCCH channel that periodically detects on the appointed positions 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 cluster user terminal of determining the place is that caller cluster user terminal still is called cluster 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 cluster user terminal at place is called cluster 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, 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 according to the schedule information of detected TTCH channel.
The concrete workflow of device embodiment shown in Figure 4 please refer to the respective description among the method embodiment 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 to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, 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, this 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 to realize 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 the sign that is used to be different from other logic channel respectively; 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; This method comprises:
Each cluster user terminal is in the physical downlink control channel PDCCH that periodically detects on the appointed positions 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 of Information piece TB that comprises described TPCCH channel bearing that is carried 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 cluster user terminal is judged the member who self whether belongs in the current group service of initiating respectively, if then set up the service plane passage of group service;
The service plane passage that the utilization of caller cluster user terminal is set up is initiated speech;
PDCCH channel after called cluster user terminal detects in each Transmission Time Interval TTI and carries out the CRC scrambling with the sign of described TTCH channel, and when on detecting described PDCCH channel, carrying 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 detected described TTCH channel, 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, this method further comprises:
After the right of speech of described caller cluster user terminal is seized, all called cluster user terminals detect in each TTI again with the sign of described TTCH channel carries out PDCCH channel after the CRC scrambling, and when on detecting described PDCCH channel, carrying 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 detected described TTCH channel, 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. according to each described method in the claim 1～5, it is characterized in that described each cluster user terminal further comprised before the PDCCH channel that periodically detects on the appointed positions after carrying out the CRC scrambling with the sign of described TPCCH channel:
The base station is notified to each cluster user terminal by broadcast with the send opportunity and transmission cycle of TPCCH channel; 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. cluster user terminal, it is characterized in that, described cluster user terminal applies is 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 the sign that is useful on other logic channel of difference respectively; 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 cluster user terminal comprises:
Detecting unit, be used in the physical downlink control channel PDCCH that periodically detects on the appointed positions 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 of Information piece TB that comprises described TPCCH channel bearing that is carried 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 cluster user terminal at place is that caller cluster user terminal still is called cluster user terminal, and judged result is notified to performance element;
Described performance element, be used for when the cluster user terminal at place is caller cluster user terminal, utilize the service plane passage of being set up to initiate speech, when the cluster user terminal at place is called cluster 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 on detecting described PDCCH channel, carrying 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. cluster 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. cluster user terminal according to claim 8, it is characterized in that, described performance element is further used for, when described cluster user terminal is called cluster 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 detected described TTCH channel, 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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