CN101577981B - Main control mobile station, network equipment and trunk communication method - Google Patents
Main control mobile station, network equipment and trunk communication method Download PDFInfo
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- CN101577981B CN101577981B CN200810106056XA CN200810106056A CN101577981B CN 101577981 B CN101577981 B CN 101577981B CN 200810106056X A CN200810106056X A CN 200810106056XA CN 200810106056 A CN200810106056 A CN 200810106056A CN 101577981 B CN101577981 B CN 101577981B
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Abstract
The invention discloses a main control mobile station, network equipment and a trunk communication method. The main control mobile station is used for controlling point-to-point communication between a calling mobile station and a called mobile station when the main control mobile station is in the coverage of a network; the main control mobile station comprises a forward module and a trunk module, wherein the forward module is used for forwarding a point-to-point communication request to the called mobile station after acquiring the point-to-point communication request sent by the calling mobile station, and notifying the network equipment to allocate resources; and the trunk module is used for interacting first control information with the network equipment through a first control link, and relaying and forwarding second control information between the network equipment and the calling mobile station and third control information between the network equipment and the called mobile station. The main control mobile station, the network equipment and the trunk communication method have the advantages that: the cost of the network equipment can be greatly saved; so long as the main control mobile station is in the coverage of the network, the point-to-point communication among the mobile stations cannot be disconnected when the mobile stations taking part in the point-to-point communication leave the network; moreover, the cost of the mobile stations is saved.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of main control mobile station, the network equipment and relay communication method.
Background technology
At present, in cellular mobile telecommunication system, because the sub-district deal with data is limited in one's ability, especially tackle big data quantity, when a plurality of travelling carriages in the sub-district need to transmit data simultaneously, although travelling carriage has enough abilities, be limited by the processing of the network equipment, some travelling carriage possibly can't be assigned to enough resources.
Traditional short-range communication such as the transmitting power of honeycomb standard mobile platform and receiving sensitivity and bluetooth system compares and wants high, therefore, and network device processing problem limited in one's ability in the time of can utilizing point-to-point communication between the travelling carriage to solve in the sub-district heavy traffic.
But when carrying out point-to-point communication between the travelling carriage, each travelling carriage that participates in communication all needs to keep and the communicating by letter to insert cellular communication system of the network equipment, that is to say participate in mobile stations communicating must be in network coverage.If participate in one of them travelling carriage deviated from network (promptly not in network coverage) of communication, the wireless link between travelling carriage can't keep.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of main control mobile station, the network equipment and relay communication method, when participating in one of them travelling carriage deviated from network of point-to-point communication with solution, and the problem that the wireless link between the travelling carriage disconnects.
For achieving the above object, on the one hand, the embodiment of the invention provides a kind of main control mobile station, when being used in being in network coverage, and the point-to-point communication of control caller travelling carriage and called mobile station, described main control mobile station comprises:
Forwarding module is used for transmitting described request to described called mobile station after the point-to-point communication request of obtaining described caller travelling carriage transmission, and informing network devices allocation resource;
Trunk module, be used for by first control link and mutual first control information of the described network equipment, and relaying is transmitted second control information between the described network equipment and the described caller travelling carriage and the 3rd control information between the described network equipment and the described called mobile station.
Described main control mobile station also comprises:
Registering modules is used to initiate the point-to-point communication group, and as main control mobile station to described network device registration.
Described main control mobile station also comprises:
Detection module is used to detect self whether in network coverage;
Notification module is used for when deviated from network, notify other travelling carriages in the described point-to-point communication group as main control mobile station to described network device registration.
Described main control mobile station also comprises:
Wave point is used for communicating with the described network equipment and communicates with other travelling carriages of described point-to-point communication group.
On the other hand, the embodiment of the invention also provides a kind of network equipment, comprising:
Distribution module, be used to receive the resource allocation request that the main control mobile station that is in the network coverage sends after, be the point-to-point communication Resources allocation of caller travelling carriage and called mobile station;
Control module, be used for when described caller travelling carriage and described called mobile station are carried out point-to-point communication, by first control link and mutual first control information of described main control mobile station, and be relaying with described main control mobile station, with mutual second control information of described caller travelling carriage and with mutual the 3rd control information of described called mobile station.
The described network equipment also comprises:
Update module is used for behind the log-on message that other travelling carriages that receive described point-to-point communication group send, the control of second between the main control mobile station after more main control mobile station of new record, and foundation and described renewal link;
Described control module is further used for by mutual the 4th control information of main control mobile station after described second control link and the described renewal, simultaneously, with the main control mobile station after the described renewal is relaying, with mutual described second control information of described caller travelling carriage and with mutual described the 3rd control information of described called mobile station.
The described network equipment also comprises:
Logging modle is used for behind the log-on message that receives the travelling carriage transmission described travelling carriage being recorded as main control mobile station.
On the one hand, the embodiment of the invention also provides a kind of relay communication method, may further comprise the steps again:
After being in main control mobile station in the network coverage and obtaining the point-to-point communication request that the caller travelling carriage sends, transmit described request to called mobile station, and informing network devices allocation resource;
By first control link and mutual first control information of the described network equipment, and relaying is transmitted second control information between the described network equipment and the described caller travelling carriage and the 3rd control information between the described network equipment and the described called mobile station.
After the described main control mobile station that is in the network coverage obtains the point-to-point communication request of caller travelling carriage transmission, transmit described request to called mobile station, and also comprise before the informing network devices allocation resource:
Described main control mobile station is initiated the point-to-point communication group, and as main control mobile station to described network device registration.
Described method also comprises:
Described main control mobile station detects self whether in network coverage;
When deviated from network, notify other travelling carriages in the described point-to-point communication group as main control mobile station to described network device registration.
Described main control mobile station communicates by the same wave point and the described network equipment and communicates with other travelling carriages in the described point-to-point communication group.
Compared with prior art, embodiments of the invention have following beneficial effect:
On the one hand, carry out in the point-to-point communication process at travelling carriage, the network equipment only needs by main control mobile station and the mutual control information of travelling carriage that participates in point-to-point communication, thereby, the expense of having saved the network equipment in a large number;
On the other hand, need only main control mobile station in network coverage, when participating in other travelling carriage deviated from network of communication, the wireless link between the travelling carriage can not disconnect;
Again on the one hand, because system has adopted TDD mode, communicating by letter between travelling carriage and the network equipment and another travelling carriage can be adopted same wave point, need not to increase other wave point, saved the cost of travelling carriage.
Description of drawings
Fig. 1 is the structural representation of the relay communications system of the embodiment of the invention;
Fig. 2 is the structural representation of the main control mobile station of the embodiment of the invention;
Fig. 3 is the structural representation of the network equipment of the embodiment of the invention;
Fig. 4 is the relay communication method of the embodiment of the invention;
Fig. 5 is a concrete scene schematic diagram of the relay communication method of the embodiment of the invention;
When Fig. 6 is non-main control mobile station deviated from network coverage, the relay communication method schematic diagram of the embodiment of the invention;
Fig. 7 is another concrete scene schematic diagram of the relay communication method of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Be illustrated in figure 1 as the structural representation of the relay communications system of the embodiment of the invention, this relay communications system adopts TDD mode, and the travelling carriage received signal in the system is identical with the frequency range that transmits, and this relay communications system comprises:
Main control mobile station 10, when being used in being in network coverage, the point-to-point communication of control caller travelling carriage 20 and called mobile station 30.
The network equipment 20 is used to the point-to-point communication Resources allocation of caller travelling carriage 20 and called mobile station 30; When caller travelling carriage 20 and called mobile station 30 are carried out point-to-point communication, be relaying with main control mobile station 10, with caller travelling carriage 20 and called mobile station 30 mutual control informations.
Caller travelling carriage 20 and called mobile station 30 are the member in the point-to-point communication group that main control mobile station 10 initiates.
Control information between the above-mentioned network equipment 40 and the travelling carriage includes but not limited to synchronizing information, monitoring resource information etc., is used to guarantee the normal operation of the point-to-point communication between the travelling carriage.
Be illustrated in figure 2 as the structural representation of the main control mobile station 10 of the embodiment of the invention, main control mobile station 10 further comprises:
Travelling carriage adopts different frequency ranges to receive and transmits in the tradition mode of frequency division duplexing mobile communication system down, therefore, needs the increase wave point to be used for point-to-point communication between travelling carriage; And, different with the mobile communication system under the mode of frequency division duplexing, what the relay communications system of the embodiment of the invention adopted is TDD mode, travelling carriage in the system adopts identical frequency range to receive and transmits, when carrying out point-to-point communication, travelling carriage adopt single wave point can finish with the network equipment communicate by letter and with the point-to-point communication of other travelling carriages, do not need to increase extra wave point.
In the embodiment of the invention, main control mobile station 10 promptly adopt wave point 11 finish with the network equipment 40 communicate by letter and with the point-to-point communication of other travelling carriages.
Certainly, the air interface technologies that adopts when the main control mobile station 10 and the network equipment 40 communicate, the air interface technologies that adopts when communicating with main control mobile station 10 and other travelling carriages can be identical, also can be different.
In the embodiment of the invention, at first initiate a point-to-point communication group by main control mobile station 10, and to network device registration; During Mobile Origination point-to-point communication in the point-to-point communication group, transmit communication request by the main control mobile station in network coverage 10, and as the relaying forwarding network appliance with carry out control information between the travelling carriage of point-to-point communication.
Therefore, main control mobile station 10 also comprises:
Registering modules 12 is used to initiate the point-to-point communication group, and registers to the network equipment 40 as main control mobile station.
When main control mobile station 10 deviated from network coverages, main control mobile station 10 will notify other travelling carriages of point-to-point communication group as main control mobile station, take over the control information between main control mobile station 10 junction network equipment 40, caller travelling carriage 20 and the called mobile station 30.
Therefore, main control mobile station 10 also comprises:
Described other travelling carriages can be other travelling carriages in caller travelling carriage, called mobile station or the point-to-point communication group.
The structure of other travelling carriages in the caller travelling carriage 20 of the embodiment of the invention, called mobile station 30 and the point-to-point communication group all structure with main control mobile station 10 is consistent, does not repeat them here.
Travelling carriage in the embodiment of the invention is a honeycomb standard mobile platform, and its transmitting power and receiving sensitivity all will be higher than short-range communication systems such as similar bluetooth, can realize middle distance (kilometer level) data point-to-point transmission, the distance limit of technology such as breakthrough bluetooth.
Be illustrated in figure 3 as the structural representation of the network equipment 40 of the embodiment of the invention, the network equipment 40 further comprises:
In system, in one or the adjacent several cell range, always there are the part communication resources not to be used, these communication resources, mainly include but not limited to technology essential factor and combinations thereof such as frequency, time slot, spreading code, can be used for direct communication between the supports mobile by network device management and distribution.
Main control mobile station after the described renewal can be other travelling carriages in caller travelling carriage 20, called mobile station 30 or the point-to-point communication group.
Certainly, the main control mobile station 10 in the above-mentioned relay communications system also can be used as the caller travelling carriage, carries out point-to-point communication with other travelling carriages in the point-to-point communication group.This moment, main control mobile station 10 at first sent the point-to-point communication request to called mobile station 30, and informing network equipment 40 Resources allocation.Main control mobile station 10 and called mobile station 30 are set up the point-to-point communication link, communicate by this point-to-point communication link.Simultaneously, main control mobile station 10 by and the network equipment 40 between the first control link, with the network equipment 40 mutual first control informations, and the 3rd control information between relaying forwarding network appliance 40 and the called mobile station 30.
When called mobile station 30 deviated from network coverages, the point-to-point communication between main control mobile station 10 and the called mobile station 30 can not be affected.
When main control mobile station 10 deviated from network coverages, other travelling carriages in the main control mobile station 10 notice point-to-point communication groups are as main control mobile station.Preferably, main control mobile station 10 notice called mobile station 30 are as main control mobile station.
Therefore, main control mobile station 10 also should possess the request module (figure does not show) that sends the point-to-point communication request, the link establishment module (figure does not show) of setting up the point-to-point communication link.
In addition, the main control mobile station 10 in the above-mentioned relay communications system also can be used as called mobile station, carries out point-to-point communication with other travelling carriages in the point-to-point communication group.After this moment, main control mobile station 10 got access to the point-to-point communication request of caller travelling carriage 20 transmissions, informing network equipment 40 Resources allocation.Main control mobile station 10 and caller travelling carriage 20 are set up the point-to-point communication link, communicate by this point-to-point communication link.Simultaneously, main control mobile station 10 by and the network equipment 40 between the first control link, with the network equipment 40 mutual first control informations, and second control information between relaying forwarding network appliance 40 and the caller travelling carriage 20.
When caller travelling carriage 20 deviated from network coverages, the point-to-point communication between main control mobile station 10 and the caller travelling carriage 20 can not be affected.
When main control mobile station 10 deviated from network coverages, other travelling carriages in the main control mobile station 10 notice point-to-point communication groups are as main control mobile station.Preferably, main control mobile station 10 notice caller travelling carriages 20 are as main control mobile station.
By the system that uses above embodiment to provide, saved the expense of the network equipment in a large number, and no matter be the arbitrary travelling carriage deviated from network in main control mobile station or the point-to-point communication, wireless link between the travelling carriage can not disconnect, simultaneously, travelling carriage and the network equipment communicate by letter and travelling carriage between communication adopt same wave point, saved the cost of travelling carriage.
Be illustrated in figure 4 as the relay communication method of the embodiment of the invention, may further comprise the steps:
Travelling carriage to network device registration can be other travelling carriages in caller travelling carriage, called mobile station or the point-to-point communication group.
In the said method, main control mobile station is by same wave point and the network equipment communicates and communicate with other travelling carriages in the point-to-point communication group.The air interface technologies that adopts when main control mobile station is communicated by letter with the network equipment and with the point-to-point communication group in other mobile communications the time air interface technologies that adopts identical or different.
Certainly, the main control mobile station in the above-mentioned relay communication method also can be used as the caller travelling carriage, carries out point-to-point communication with other travelling carriages in the point-to-point communication group.This moment, main control mobile station at first sent the point-to-point communication request to called mobile station, and informing network devices allocation resource.Main control mobile station and called mobile station are set up the point-to-point communication link, communicate by this point-to-point communication link.Simultaneously, main control mobile station by and the network equipment between the first control link, with mutual first control information of the network equipment, and the 3rd control information between relaying forwarding network appliance and the called mobile station.
When called mobile station deviated from network coverage, the point-to-point communication between main control mobile station and the called mobile station can not be affected.
When main control mobile station deviated from network coverage, other travelling carriages in the main control mobile station notice point-to-point communication group are as main control mobile station.Preferably, main control mobile station notice called mobile station is as main control mobile station.
In addition, the main control mobile station in the above-mentioned relay communication method also can be used as called mobile station, carries out point-to-point communication with other travelling carriages in the point-to-point communication group.After this moment, main control mobile station got access to the request of caller travelling carriage transmission point-to-point communication, informing network devices allocation resource.Main control mobile station and caller travelling carriage are set up the point-to-point communication link, communicate by this point-to-point communication link.Simultaneously, main control mobile station by and the network equipment between the first control link, with mutual first control information of the network equipment, and second control information between relaying forwarding network appliance and the caller travelling carriage.
When caller travelling carriage deviated from network coverage, the point-to-point communication between main control mobile station and the caller travelling carriage can not be affected.
When main control mobile station deviated from network coverage, with other travelling carriages in the notice point-to-point communication group as main control mobile station.Preferably, main control mobile station notice caller travelling carriage is as main control mobile station.
By the method for using above embodiment to provide, saved the expense of the network equipment in a large number, and no matter be the arbitrary travelling carriage deviated from network in main control mobile station or the point-to-point communication, wireless link between the travelling carriage can not disconnect, simultaneously, travelling carriage and the network equipment communicate by letter and travelling carriage between communication adopt same wave point, saved the cost of travelling carriage.
Be illustrated in figure 5 as a concrete scene schematic diagram of the relay communication method of the embodiment of the invention, system comprises the network equipment that travelling carriage A, travelling carriage B and travelling carriage can insert, and the concrete steps of described method are as follows:
1) travelling carriage A initiates the point-to-point communication group, as main control mobile station to network device registration;
This point-to-point communication group comprises travelling carriage A and travelling carriage B, and wherein travelling carriage A is a main control mobile station, and is in the network coverage.
2) travelling carriage A is to the travelling carriage B request of making a call, and informing network devices allocation resource;
3) the point-to-point communication link between travelling carriage A and travelling carriage B set up communicates by this point-to-point communication link;
4) carry out in the point-to-point communication process the mutual control information A of control link A between the travelling carriage A and the network equipment pass through, and the control information B between relaying forwarding network appliance and the travelling carriage B at travelling carriage A and travelling carriage B;
5) when travelling carriage A deviated from network coverage, notice travelling carriage B;
6) after travelling carriage B receives the notice of travelling carriage A, as main control mobile station to network device registration;
7) network equipment upgrades the main control mobile station of record, and the control link B between foundation and the travelling carriage B;
8) travelling carriage B is as main control mobile station, by control link B and the mutual control information B of the network equipment, and the control information A between the travelling carriage A of relaying forwarding network appliance and deviated from network.
Among the above embodiment, when non-main control mobile station B deviated from network, because the control information of the point-to-point communication of non-main control mobile station B comes from main control mobile station A, at this moment, if the main control mobile station A in the point-to-point communication is in network coverage, even non-main control mobile station B deviated from network can not exert an influence to the point-to-point communication between the travelling carriage.When being illustrated in figure 6 as non-main control mobile station deviated from network, the schematic diagram of the relay communication method of the embodiment of the invention.
Figure 7 shows that another concrete scene schematic diagram of the relay communication method of the embodiment of the invention, system comprises the network equipment that travelling carriage A, travelling carriage B, travelling carriage C and travelling carriage can insert, and the concrete steps of described method are as follows:
1) travelling carriage A initiates the point-to-point communication group, as main control mobile station to network device registration;
This point-to-point communication group comprises travelling carriage A, travelling carriage B and travelling carriage C, and wherein travelling carriage A is a main control mobile station, and is in the network coverage.
2) travelling carriage B sends with travelling carriage C to travelling carriage A and carries out the call request of point-to-point communication;
3) after travelling carriage A obtains this call request, informing network devices allocation resource;
4) the point-to-point communication link between travelling carriage B and travelling carriage C set up, and communicate by this point-to-point communication link;
5) carry out in the point-to-point communication process at travelling carriage B and travelling carriage C, the mutual control information A of control link A between the travelling carriage A and the network equipment pass through, and the control information C between the control information B between relaying forwarding network appliance and the travelling carriage B and the network equipment and the travelling carriage C;
6) when travelling carriage A deviated from network coverage, notice travelling carriage B registers to network side as main control mobile station;
The travelling carriage A travelling carriage B in the choice point point to-point communication or travelling carriage C at random also can select according to the RST of mobile B and travelling carriage C as main control mobile station.
7) after travelling carriage B receives the notice of mobile A, as main travelling carriage to network device registration;
8) network equipment upgrades the main control mobile station of record, and the control link B between foundation and the travelling carriage B;
9) travelling carriage B is as main control mobile station, by control link B and the mutual control information B of the network equipment, and the control information C between relaying forwarding network appliance and the travelling carriage C.
In the foregoing description, when non-main control mobile station B or travelling carriage C deviated from network, because the control information of the point-to-point communication of non-main control mobile station comes from main control mobile station A, at this moment, as long as the main control mobile station A in the point-to-point communication is in network coverage, even non-main control mobile station deviated from network can not exert an influence to the point-to-point communication between the travelling carriage.
It is synchronous that travelling carriage in the foregoing description must keep.
Between the travelling carriage in the foregoing description and travelling carriage include but not limited to voice and data service with communicating by letter of the network equipment, the concrete class of business of supporting is decided on resource situation.
The specific embodiment of the present invention is not limited to this; to those skilled in the art; can the method according to this invention and design be equal to accordingly and change or replace, and all these changes or replacement all should belong within protection scope of the present invention.
Claims (11)
1. a main control mobile station when being used in being in network coverage, is controlled the point-to-point communication of caller travelling carriage and called mobile station, it is characterized in that, comprising:
Forwarding module is used for transmitting described request to described called mobile station after the point-to-point communication request of obtaining described caller travelling carriage transmission, and informing network devices allocation resource;
Trunk module, be used for by first control link and mutual first control information of the described network equipment, and relaying is transmitted second control information between the described network equipment and the described caller travelling carriage and the 3rd control information between the described network equipment and the described called mobile station.
2. main control mobile station according to claim 1 is characterized in that, also comprises:
Registering modules is used to initiate the point-to-point communication group, and as main control mobile station to described network device registration.
3. main control mobile station according to claim 1 is characterized in that, also comprises:
Detection module is used to detect self whether in network coverage;
Notification module is used for when deviated from network, notify other travelling carriages in the described point-to-point communication group as main control mobile station to described network device registration.
4. main control mobile station according to claim 1 is characterized in that, also comprises:
Wave point is used for communicating with the described network equipment and communicates with other travelling carriages of described point-to-point communication group.
5. a network equipment is characterized in that, comprising:
Distribution module, be used to receive the resource allocation request that the main control mobile station that is in the network coverage sends after, be the point-to-point communication Resources allocation of caller travelling carriage and called mobile station;
Control module, be used for when described caller travelling carriage and described called mobile station are carried out point-to-point communication, by first control link and mutual first control information of described main control mobile station, and be relaying with described main control mobile station, with mutual second control information of described caller travelling carriage and with mutual the 3rd control information of described called mobile station.
6. the network equipment according to claim 5 is characterized in that, also comprises:
Update module is used for behind the log-on message that other travelling carriages that receive described point-to-point communication group send, the control of second between the main control mobile station after more main control mobile station of new record, and foundation and described renewal link;
Described control module is further used for by mutual the 4th control information of main control mobile station after described second control link and the described renewal, simultaneously, with the main control mobile station after the described renewal is relaying, with mutual described second control information of described caller travelling carriage and with mutual described the 3rd control information of described called mobile station.
7. the network equipment according to claim 5 is characterized in that, also comprises:
Logging modle is used for behind the log-on message that receives the travelling carriage transmission described travelling carriage being recorded as main control mobile station.
8. a relay communication method is characterized in that, may further comprise the steps:
After being in main control mobile station in the network coverage and obtaining the point-to-point communication request that the caller travelling carriage sends, transmit described request to called mobile station, and informing network devices allocation resource;
By first control link and mutual first control information of the described network equipment, and relaying is transmitted second control information between the described network equipment and the described caller travelling carriage and the 3rd control information between the described network equipment and the described called mobile station.
9. relay communication method according to claim 8, it is characterized in that, after the described main control mobile station that is in the network coverage obtains the point-to-point communication request of caller travelling carriage transmission, transmit described request to called mobile station, and also comprise before the informing network devices allocation resource:
Described main control mobile station is initiated the point-to-point communication group, and as main control mobile station to described network device registration.
10. relay communication method according to claim 8 is characterized in that, also comprises:
Described main control mobile station detects self whether in network coverage;
When deviated from network, notify other travelling carriages in the described point-to-point communication group as main control mobile station to described network device registration.
11. relay communication method according to claim 8 is characterized in that, described main control mobile station communicates by the same wave point and the described network equipment and communicates with other travelling carriages in the described point-to-point communication group.
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| CN200810106056XA CN101577981B (en) | 2008-05-08 | 2008-05-08 | Main control mobile station, network equipment and trunk communication method |
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| CN200810106056XA CN101577981B (en) | 2008-05-08 | 2008-05-08 | Main control mobile station, network equipment and trunk communication method |
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| CN101577981B true CN101577981B (en) | 2011-07-13 |
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| CN102571853A (en) * | 2010-12-16 | 2012-07-11 | 中国移动通信集团四川有限公司 | Method, system and device for remote point-to-point communication of mobile terminals |
| CN104936187B (en) * | 2014-03-20 | 2018-12-25 | 电信科学技术研究院 | Resource allocation methods and device for the transmission of device-to-device signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1461574A (en) * | 2001-04-17 | 2003-12-10 | 诺基亚公司 | One-to-one communication |
| CN1767670A (en) * | 2004-10-29 | 2006-05-03 | 华为技术有限公司 | Digital group system PTT point-to-point calling method based on GSM technique |
| CN2914501Y (en) * | 2005-01-25 | 2007-06-20 | 美商内数位科技公司 | Radio communication system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1461574A (en) * | 2001-04-17 | 2003-12-10 | 诺基亚公司 | One-to-one communication |
| CN1767670A (en) * | 2004-10-29 | 2006-05-03 | 华为技术有限公司 | Digital group system PTT point-to-point calling method based on GSM technique |
| CN2914501Y (en) * | 2005-01-25 | 2007-06-20 | 美商内数位科技公司 | Radio communication system |
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