CN101835098B - Dense user area-orientated wireless network reconstructed communication method - Google Patents
Dense user area-orientated wireless network reconstructed communication method Download PDFInfo
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Abstract
The invention discloses a dense user area-orientated wireless network reconstructed communication method, which belongs to the technical field of honeycomb mobile communication networks. The method is characterized in that: the method is realized among the terminals, a base station, a wireless network controller and a core network (CN), and according to the distance information between communication terminals and the request of the terminals, the base station determines that the current communication between different terminals adopts conventional communication, direct communication of point-to-point terminals or direct communication of autonomous multicast terminals, and then sends the selective communication mode and the corresponding transmission information to the communication terminals in a signaling mode to perform control; the CN takes charge of judging the cell home of the terminals, performing authentication and encryption and acquiring terminal position information; and the wireless network controller calculates the distance between the communication terminals. The method has the advantages of low signaling overhead, frequency spectrum resource saving, reduction of transmitting power consumption and improvement of capacity of network users.
Description
Technical field
The invention provides a kind of wireless network reconstructed communication method towards intensive user area; Belong to communication technical field; Be particularly related to a kind of physical structure based on existing cellular mobile communication networks; According to positional information and user's request of portable terminal,, be mainly used in and satisfy the demand that intensive user area large-capacity user inserts through the method for the variable general communication of signaling control realization logical construction, point-to-point terminal direct communication and autonomous multi-cast terminal direct communication.
Background technology
With mobile communication, WLAN etc. is that the wireless network of representative has become the important new and high technology pillar industry in countries in the world.At present, business-like 3-G (Generation Three mobile communication system) (3G) in development with moving forward steadily; With WiMAX (World Interoperability for Microwave Access) is the spotlight that the high speed development of the BWA of representative has become the telecommunication industry development; The implementation phase of the entering towards the terrestrial wireless digital television broadcasting system of multimedia service.A common objective of these wireless networks is with higher speed, better flexibility and extensibility, lower cost, and the wireless communications application in the global range is provided.
On the other hand; People also progressively recognize existing and are about to the limitation of the wireless network of release at aspects such as Radio Resource complex optimum utilizations; The contradiction of the business demand that still can not solve limited frequency spectrum resources well and increase rapidly, and consequent radio communication bottleneck problem becomes increasingly conspicuous.With the mobile communication is example, from the present case number of users in continuous growth: the promise west corporate statistics Cellular Networks user in the whole world at present surpasses 3,000,000,000, will reach 5,000,000,000 by 2015.Meanwhile, the business demand amount of each user every day also will be among the rapid growth always.The expert combines to think after the ITU-R of radio communication portion of the International Telecommunications Union correlative study analysis-by-synthesis, will have the spectrum requirement of 1300M～1700MHz to the communication of the year two thousand twenty global radio.With respect to the spectrum division of world's radio conference 1000MHz, this just means that following wireless communication technology will face great spectral gaps.In frequency spectrum resource deficient day by day today, how effectively to utilize limited frequency spectrum resources, to alleviate growing wireless traffic demand, become the important proposition of current wireless network design.
At present; The core concept of the cellular mobile communication networks that coverage is the widest is that whole overlay area is divided into several sub-districts; Base station of each cell setting is distributed one group of Radio Resource simultaneously, and the different Radio Resource of neighbor cell allocation is to prevent mutual interference.In each sub-district, portable terminal and base station are set up full duplex radio and are communicated by letter and be connected the wireless access of accomplishing communication.Can only could realize intercommunication mutually through the base station switching between the terminal.Yet to the intensive user situation that brings as large-scale activities such as the Olympic Games, World Expos, the base station load increases the weight of, and general operator can adopt the microcellulor measure of intensive covering to guarantee communication through setting up the base station.This same frequency that can increase the minizone on the one hand disturbs, and increases energy consumption, needs a large amount of additional financial resources inputs on the other hand, and uneconomical.Need fundamentally improve the validity that Radio Resource utilizes for this reason,, realize the combined optimization between resource and the business, and then promote network capacity to greatest extent through changing the architecture of prior wireless network.
Based on above consideration, the present invention is directed to intensive user's scene, based on the physical structure of existing cell mobile communication systems, a kind of wireless network logical reconstruction formula communication means towards intensive user area has been proposed.The present invention has added point-to-point terminal direct communication and autonomous multi-cast terminal direct communication mode through considering the positional information of portable terminal on the basis of general communication mode; Meanwhile; The present invention has adopted a kind of logical reconstruction formula communication technology based on signaling control; Utilize the signaling link between base station and the terminal, to pass to portable terminal wireless network reconstructed to realize through controlling signaling for the communication pattern that current terminal should be adopted (comprising: general communication, point-to-point terminal direct communication and autonomous multi-cast terminal direct communication) and corresponding transmission information (comprising frequency band that transmission takies, transmission means etc.).Compare with existed system, one aspect of the present invention need not change the physical structure of existing system, adopts very little signaling consumption just can change the cellular logic topological structure easily; On the other hand, save frequency spectrum resource, reduced the emission power consumption, improved the user capacity of network.
Summary of the invention
The object of the present invention is to provide a kind of wireless network reconstructed communication method towards intensive user area.
Characteristics of the present invention are: based on the physical structure of cellular mobile communication networks; Positional information and user's request to portable terminal; Change the logical construction of network; Variable logical construction comprises general communication, point-to-point terminal direct communication, and the autonomous multi-cast terminal direct communication of point-to-multipoint; Wherein, the reconstruct formula communication of wireless network is to realize through the signaling control between base station and the terminal.
Thinking of the present invention is:
(1) the present invention can provide the communication mode of the variable general communication of logical construction, point-to-point terminal direct communication and autonomous multi-cast terminal direct communication at least for the terminal.
Popularizing and development of radio communication, make that people can enjoyment information transmit reliable, convenient with fast.Yet; To the multimedia messages transmission that data volume is very big in the intensive user area; Because the frequency spectrum resource that distributes is limited; If adopt conventional communication (need take up, descending two communication links) to transmit singlely, when the communication terminal distance is very uneconomic scheme when nearer based on the base station transfer.Therefore; Consider that when the phase mutual edge distance is closer between communication terminal we use a communication link to realize that the terminal directly intercoms mutually, not only can reduce taking frequency spectrum resource; Alleviate the load of base station, also can reduce the transmitting power at base station and terminal simultaneously.The present invention is based on above-mentioned thought; On the basis of general communication mode; Through terminal positioning, obtain the positional information of portable terminal, obtain range information by terminal positional information again; General communication or terminal direct communication mode should be adopted in definite thus terminal, to effectively utilize limited frequency spectrum resources more.
Meanwhile, if the terminal has identical content information when contiguous a plurality of terminals are distributed,, adopt point can further reduce taking to frequency spectrum resource to the multiple spot method for multicast communication than the point-to-point unicast communication of terminal room.
(3) the present invention has adopted a kind of logical reconstruction formula communication technology based on signaling control at least.
According to the request at range information between communication terminal and terminal, the base station determines that communication is to adopt general communication, point-to-point terminal direct communication or autonomous multi-cast terminal direct communication between current different terminals.Particularly, under and the situation greater than given distance threshold (threshold value can be made as in the communication terminal apart from base station terminal and the distance between the base station farthest) far away when communication terminal distance, the communication pattern of traditional general communication will be selected in the base station; When communication terminal distance less than given thresholding situation under, the pattern of terminal direct communication is then selected in the base station, can further determine to adopt the method for point-to-point direct communication or autonomous multicast direct communication simultaneously according to the autonomous request at terminal.Communication pattern is selected through above-mentioned algorithm in the base station, afterwards with the communication pattern result who selects, transmit information (comprising frequency band that transmission takies, transmission means etc.) accordingly and pass to the terminal to control through means of signaling.The present invention is based on above-mentioned thought; Select communication pattern by base station controller or radio network controller according to communication terminal range information and autonomous request; Produce the control corresponding signaling, through signaling link signaling is passed to portable terminal again, realize control the mutual communication pattern of terminal room.
The invention is characterized in, contain following steps successively:
Step (1); Construct a wireless network towards intensive user; Contain portable terminal, base station, be built-in with the base station controller BSC of positioning service center, shift position SMLC or be built-in with the moving exchanging center MSC of the radio network controller (RNC) of positioning service center, shift position SMLC, built-in access location logger VLR, the support node SGSN that serves GPRS, GMLC GMLC and be positioned at the attaching position register of core net CN; Wherein
Portable terminal has several, is mobile phone or PDA or notebook computer, can carry out straight-through the communicating by letter of general communication or terminal with other-end in this cellular cell, and the straight-through communication in said terminal comprises the point-to-point communication and autonomous multiple spot cast communication of terminal to the terminal,
The base station at least one, all be positioned at said cellular cell, be 2G base station BS or NodeB or WLAN access point AP, but all contain terminal location measuring unit LMU, be responsible for wireless signal and measure and supply said shift position positioning service center SMLC to use,
Base station controller BSC or radio network controller (RNC); Except controlling said base station; Also link to each other with said attaching position register HLR, GMLC GMLC through said moving exchanging center MSC; Perhaps the support node SGSN through service GPRS links to each other with said attaching position register with said GMLC GMLC simultaneously; So that said base station controller BSC or radio network controller (RNC) are selected corresponding location technology according to the QoS requirement Qos of business, positioning service center SMLC delivers to said GMLC GMLC to location information of terminals with the form of longitude and latitude through said shift position
Attaching position register HLR; Link to each other with the AuC of AUC of said core net CN, said portable terminal is carried out authentication and encryption, be used to store the user's that administers subscription data and mobile subscriber's location information of cell; So that for the calling that arrives certain portable terminal provides routing iinformation
Gateway location Mobility Center GMLC; In said core net CN; It is the gateway that applications is obtained terminal location; The positional information of the longitude and latitude that is used for said shift position positioning service center SMLC is sent here converts geographical coordinate into, is convenient to accept the request of said base station controller BSC or radio network controller (RNC) and makes corresponding response
Step (2), realize the wireless network reconstructed formula communication of user's close quarters successively according to the following steps:
Step (2.1), portable terminal are sent signaling connection request message and are given said base station controller BSC or radio network controller (RNC),
Step (2.2); After said portable terminal is received the signaling connection setup complete message that said base station controller BSC or radio network controller (RNC) send; Send initial service request to said base station controller BSC or radio network controller (RNC); Comprising: the type of service of request, called number and ask the request pattern certainly, said autonomous request pattern comprises unicast communication mode and cast communication mode
Step (2.3); After base station controller BSC or radio network controller (RNC) are received said initial service request; Send out initial UE information to said core net; After passing through the authentication ciphering of the AuC of AUC of said core net CN again, whether base station controller BSC or radio network controller (RNC) are the request of this cellular cell user's communications to the attaching position register that is positioned at core net CN (HLR) request terminal called information of home location so that judge said initial service request
Step (2.4), if the communication request in this cellular cell, said base station controller BSC or radio network controller (RNC) send the location dependent data request of transmitting to the GMLC GMLC that is positioned at said core net CN,
After step (2.5), said base station controller BSC or radio network controller (RNC) are received the location dependent data information-reply that said GMLC GMLC sends, through calculating the distance between communication terminal,
Step (2.6); Said base station controller BSC or radio network controller (RNC) judge whether the terminal asks multicast; If do not ask multicast, judge that distance between communication terminal is whether greater than the threshold value of distance between predefined communication terminal: if less than the setting threshold value, then choice point is to the point terminal direct mode operation; If, then move the general communication pattern greater than setting threshold value; If request multicast; Judge at a distance of distance between communication terminal farthest whether greater than the threshold value of distance between predefined communication terminal: if, then select autonomous multi-cast terminal direct mode operation, if greater than setting threshold value less than setting threshold value; Then move the general communication pattern
Step (2.7); Said base station controller BSC or radio network controller (RNC) produce communication pattern and transmission information Control signaling message sends to the communication terminal both sides through signaling link; Said communication pattern and transmission information Control signaling message comprise communication pattern field, transmission band field and transmitting channel information field at least; General communication pattern, point-to-point terminal direct mode operation or autonomous multi-cast terminal direct mode operation are adopted in the indication of communication pattern field; The frequency interval of frequency range, emission and the reception of transmission band field indication transmission; The transformat combination that transmitting channel information field indication is permitted using and with concrete other the relevant information of transmission channel; Said signaling link is the Radio Link that is used for Signalling exchange between said base station and portable terminal that is distributed by said base station; Comprise the Dedicated Signaling Channel of Separate Dedicated Control Channel SDCCH among the GSM, the Forward Dedicated Control Channel F-DCCH among the CDMA2000, the DCCH DCCH among the TD-SCDMA, perhaps comprise the common channel among the GSM with the Common transport channel among path channels ACCH, the WCDMA
Step (2.8), several portable terminals that communicate by letter are sent successful confirmation of receipt message ACK to said base station controller BSC or radio network controller (RNC) after receiving said control signaling message,
Step (2.9), several portable terminals that communicate by letter begin to communicate by letter with transmission information according to the communication pattern that provides in the control signaling message.
A kind of wireless network reconstructed communication method that proposes towards intensive user area, its effect is:
(1) on the basis of cell mobile communication systems general communication mode, added the mode of terminal direct communication, alleviated the load of base station, reduced the transmitting power at base station and terminal, reduced taking to system spectrum;
(2) terminal direct communication mode being adopted the straight-through method in point-to-point terminal according to the autonomous request decision at terminal still is the straight-through method of autonomous multi-cast terminal, has effectively utilized frequency spectrum resource more, has increased the user capacity of system;
(3) adopted a kind of logical reconstruction formula communication technology based on signaling control; Need not change the physical structure of existing system; Can realize the communication network reconstructing method that logical construction is optional through minimum expense, effectively improve the availability of frequency spectrum and the power system capacity of system.
Description of drawings:
Fig. 1 realizes towards the System Framework structured flowchart of the wireless network reconstructed communication method of intensive user area.
Fig. 2 is towards the wireless network reconstructed communication method realization flow of intensive user area.
Fig. 3 is based on the logical reconstruction formula communication technology signaling control schematic flow sheet of signaling control.
Fig. 4 communication pattern and transmission information wireless resource control (RRC) signaling message form.
Embodiment:
Below in conjunction with accompanying drawing, specific embodiments of the invention is explained as follows.
Realization of the present invention, contains in this basic structure referring to accompanying drawing 1 towards the basic structure of the System Framework of the wireless network reconstructed communication method of intensive user area:
At least one base station, it can be 2G base station (BS), NodeB (Node-B) or WLAN access point (AP) or the like.In the present invention, it comprises terminal location measuring unit LMU, is responsible for wireless signal and measures the use of confession SMLC calculating location information.
At least one base station controller (BSC) or radio network controller (RNC); Can realize traditional cellular mobile communication Base Station Control Function; In the present invention; Also can realize positional information and autonomous request, for general communication is selected in terminal communication, point-to-point terminal is straight-through or the function of the Different Logic structure communication pattern that autonomous multi-cast terminal is straight-through based on portable terminal.Base station controller or radio network controller also comprise positioning service center, shift position (SMLC), can select suitable location technology according to the Qos of business, and location information of terminals is delivered to GMLC GMLC with the form of longitude and latitude.Base station controller or radio network controller link to each other with GMLC (GMLC) with attaching position register (HLR) through mobile switching centre (MSC) or Serving GPRS Support Node (SGSN).The effect of attaching position register (HLR) is the storage user's that administers subscription data and mobile subscriber's a location information of cell, can be to the calling of certain portable terminal routing iinformation is provided.GMLC (GMLC) is the gateway that applications is obtained terminal location, and the positional information of the longitude and latitude that its function can be sent SMLC here converts geographical coordinate into, accepts the request of base station controller or radio network controller and makes corresponding response etc.
At least some portable terminals (UE), it can be mobile phone, PDA or notebook computer or the like, can lead directly to and carry out through general communication, the straight-through or autonomous multi-cast terminal in point-to-point terminal with communicating by letter of other-end in this sub-district.
At least some communication links; They are to be used for base station and terminal room by what the base station was distributed; The Radio Link of terminal and terminal room communication interaction; Include but not limited to, (use AMPS) analog communication, use that the digital communication of GSM, IS-95 or GPRS is communicated by letter with the third generation that uses CDMA2000, WCDMA or TD-SCDMA etc.
At least some signaling links; They are the Radio Links that are used for base station and terminal room Signalling exchange that distributed by the base station; Can be Dedicated Signaling Channel, such as the Forward Dedicated Control Channel (F-DCCH) among the Separate Dedicated Control Channel among the GSM (SDCCH), the CDMA2000, the DCCH (DCCH) among the TD-SCDMA; Also can be common channel, such as among the GSM with Common transport channel among path channels (ACCH), the WCDMA etc.
Among the present invention for the location technology of portable terminal; Can adopt two big types of at present main technology: the method for 1) utilizing the characteristic parameter of the radio wave signal of propagating between base station and the travelling carriage of mobile communications network to position, all information (information strength time delay information or receiver antenna array are measured the incidence angle of portable terminal emission electric wave etc. between wireless base station sector auxiliary information, portable terminal and base station) of collecting through network that adds is carried out the method that computing draws terminal location; 2) utilize the built-in GPS receiver module of travelling carriage, receive the method that gps navigation message positions.Also can above two types of technology be combined and realize the mixed positioning art.Specifically when selecting location technology, need take all factors into consideration the tenability at cost of investment, positioning accuracy demand and network and terminal etc., at present the method for main flow have 1, TDOA; 2, CELL-ID; 3, OTDOA; 4, A-GPS; 5, PN4747; 6, GPSONE.
Fig. 2 is the wireless network reconstructed communication method realization flow towards intensive user area that the present invention proposes.Wireless network reconstructed communication method towards intensive user area as shown in Figure 2, that the present invention proposes may further comprise the steps:
1) portable terminal sends initial service request (comprise the type of service, called number of terminal request, ask information such as request pattern certainly) to base station controller or radio network controller;
2) base station controller or radio network controller judge to sub-district, attaching position register (HLR) inquiry terminal called place whether request is the communication request in this sub-district;
3) if the communication request in this sub-district, base station controller or radio network controller are through to Gateway Mobile Location Center GMLC acquisition request location information of terminals;
4) base station controller or radio network controller calculate the distance between communication terminal by location information of terminals;
5) base station controller or radio network controller judge according to the request of asking certainly at terminal whether the terminal asks multicast;
6) if multicast is not asked at the terminal, base station controller or radio network controller are judged the communication pattern of current realization according to the comparison of the distance between communication terminal with given thresholding;
7) if distance is less than given thresholding between communication terminal, point-to-point terminal direct mode operation starts, and base station controller or radio network controller produce corresponding communication pattern and transmission information Control signaling, and sends the terminal to through signaling link;
8) if distance is greater than given thresholding between communication terminal, after the general communication pattern started, its realization was identical with the realization principle of existing cell mobile communication systems;
9) as if the terminal request multicast, base station controller or radio network controller are judged the communication pattern of current realization according at a distance of the comparison of the distance between communication terminal farthest with given thresholding;
10) if apart distance is less than given thresholding between communication terminal farthest, autonomous multi-cast terminal direct mode operation starts, and base station controller or radio network controller produce the corresponding communication pattern and transmit the information Control signaling, and send the terminal to through signaling link;
11) if apart distance is greater than given thresholding between communication terminal farthest, after the general communication pattern started, its realization was identical with the realization principle of existing cell mobile communication systems;
Fig. 3 is the signaling control schematic flow sheet based on the logical reconstruction formula communication technology of signaling control of the inventive method.As shown in Figure 3, the logical reconstruction formula communication technology signaling control flow process based on signaling control may further comprise the steps:
1) mobile terminal UE is sent signaling connection request message and is given base station controller BSC or radio network controller (RNC);
2) after mobile terminal UE is received the signaling connection setup complete message; Send initial service request message to base station controller BSC or radio network controller (RNC); Base station controller BSC or the radio network controller (RNC) initial terminal information of will being correlated with again sends to core net CN, the type of service of notice core net terminal request;
3) core net is initiated authentication and ciphering process;
4) base station controller BSC or radio network controller (RNC) send the request of inquiry terminal called ownership place according to the terminal UE initial service request to the attaching position register that is positioned at core net CN (HLR);
5) after base station controller BSC or radio network controller (RNC) receive that dialed field is replied message, judge whether services request is the communication request in this sub-district;
6) if the communication request in this sub-district, base station controller BSC or radio network controller (RNC) send the location dependent data request to the GMLC GMLC that is positioned at core net CN;
7) after base station controller BSC or radio network controller (RNC) are received the location dependent data information-reply of GMLC GMLC transmission, obtain the distance between communication terminal by positional information calculation;
8) judge whether the terminal asks multicast, if do not ask multicast, judge that distance between communication terminal is whether greater than given threshold value: if less than given threshold value, then if choice point greater than given threshold value, is then selected the general communication pattern to the point terminal direct mode operation; If the request multicast, judge at a distance of distance between communication terminal farthest whether greater than given threshold value: if less than given threshold value, then select autonomous multi-cast terminal direct mode operation,, then select the general communication pattern if greater than given threshold value;
9) base station controller BSC or radio network controller (RNC) generation communication pattern and transmission information Control signaling message send to the communication terminal both sides through the signaling link of previous foundation;
10) mobile terminal UE is sent successful confirmation of receipt information A CK to base station controller BSC or radio network controller (RNC) after receiving the control signaling message;
11) mobile terminal UE begins to communicate according to the communication pattern and the transmission information that provide in the control signaling message.
Communication pattern and transmission information wireless resource control (RRC) signaling message form that Fig. 4 proposes for the present invention.As shown in Figure 4; Communication pattern and transmission information RRC signaling message form comprise communication pattern field, transmission band field, transmitting channel information field at least; Wherein general communication pattern, the autonomous multicast pattern of point-to-point direct mode operation in terminal or terminal are adopted in the indication of communication pattern field; The frequency interval of frequency range, emission and the reception of transmission band field indication transmission; The transformat combination that transmitting channel information field indication is permitted using and with concrete other the relevant information of transmission channel, like information such as coded systems, modulation system, spreading factor, scrambler number.
Claims (1)
1. the wireless network reconstructed communication method towards intensive user area is characterized in that, contains following steps successively:
Step (1); Construct a wireless network towards intensive user; Contain portable terminal, base station, be built-in with the base station controller BSC of positioning service center, shift position SMLC or be built-in with the moving exchanging center MSC of the radio network controller (RNC) of positioning service center, shift position SMLC, built-in access location logger VLR, the support node SGSN that serves GPRS, GMLC GMLC and be positioned at the attaching position register of core net CN; Wherein
Portable terminal has several, is mobile phone or PDA or notebook computer, can carry out straight-through the communicating by letter of general communication or terminal with other-end in this cellular cell, and the straight-through communication in said terminal comprises the point-to-point communication and autonomous multiple spot cast communication of terminal to the terminal,
The base station at least one, all be positioned at said cellular cell, be 2G base station BS or NodeB or WLAN access point AP, but all contain terminal location measuring unit LMU, be responsible for wireless signal and measure and supply said shift position positioning service center SMLC to use,
Base station controller BSC or radio network controller (RNC); Except controlling said base station; Also link to each other with said attaching position register HLR, GMLC GMLC through said moving exchanging center MSC; Perhaps the support node SGSN through service GPRS links to each other with said attaching position register with said GMLC GMLC simultaneously; So that said base station controller BSC or radio network controller (RNC) are selected corresponding location technology according to the QoS requirement Qos of business, positioning service center SMLC delivers to said GMLC GMLC to location information of terminals with the form of longitude and latitude through said shift position
Attaching position register HLR; Link to each other with the AuC of AUC of said core net CN, said portable terminal is carried out authentication and encryption, be used to store the user's that administers subscription data and mobile subscriber's location information of cell; So that for the calling that arrives certain portable terminal provides routing iinformation
Gateway location Mobility Center GMLC; In said core net CN; It is the gateway that applications is obtained terminal location; The positional information of the longitude and latitude that is used for said shift position positioning service center SMLC is sent here converts geographical coordinate into, is convenient to accept the request of said base station controller BSC or radio network controller (RNC) and makes corresponding response
Step (2), realize the wireless network reconstructed formula communication of user's close quarters successively according to the following steps:
Step (2.1), portable terminal are sent signaling connection request message and are given said base station controller BSC or radio network controller (RNC),
Step (2.2); After said portable terminal is received the signaling connection setup complete message that said base station controller BSC or radio network controller (RNC) send; Send initial service request to said base station controller BSC or radio network controller (RNC); Comprising: the type of service of request, called number and independently ask pattern, said autonomous request pattern comprises unicast communication mode and cast communication mode
Step (2.3); After base station controller BSC or radio network controller (RNC) are received said initial service request; Send out initial UE information to said core net; After passing through the authentication ciphering of the AuC of AUC of said core net CN again, whether base station controller BSC or radio network controller (RNC) are the request of this cellular cell user's communications to the attaching position register that is positioned at core net CN (HLR) request terminal called information of home location so that judge said initial service request
Step (2.4), if the communication request in this cellular cell, said base station controller BSC or radio network controller (RNC) send the location dependent data request of transmitting to the GMLC GMLC that is positioned at said core net CN,
After step (2.5), said base station controller BSC or radio network controller (RNC) are received the location dependent data information-reply that said GMLC GMLC sends, through calculating the distance between communication terminal,
Step (2.6); Said base station controller BSC or radio network controller (RNC) judge whether the terminal asks multicast; If do not ask multicast, judge that distance between communication terminal is whether greater than the threshold value of distance between predefined communication terminal: if less than the setting threshold value, then choice point is to the point terminal direct mode operation; If, then move the general communication pattern greater than setting threshold value; If request multicast; Judge at a distance of distance between communication terminal farthest whether greater than the threshold value of distance between predefined communication terminal: if, then select autonomous multi-cast terminal direct mode operation, if greater than setting threshold value less than setting threshold value; Then move the general communication pattern
Step (2.7); Said base station controller BSC or radio network controller (RNC) produce communication pattern and transmission information Control signaling message; And send to the communication terminal both sides through signaling link; Said communication pattern and transmission information Control signaling message comprise communication pattern field, transmission band field and transmitting channel information field at least; General communication pattern, the autonomous multicast pattern of point-to-point terminal direct mode operation or terminal are adopted in the indication of communication pattern field; The frequency interval of frequency range, emission and the reception of transmission band field indication transmission; The transformat combination that transmitting channel information field indication is permitted using and with concrete other the relevant information of transmission channel, said signaling link is the Radio Link that is used for Signalling exchange between said base station and portable terminal that is distributed by said base station, comprises the Dedicated Signaling Channel of Separate Dedicated Control Channel SDCCH among the GSM, the Forward Dedicated Control Channel F-DCCH among the CDMA2000, the DCCH DCCH among the TD-SCDMA; Perhaps comprise the common channel among the GSM with the Common transport channel among path channels ACCH, the WCDMA
Step (2.8), several portable terminals that communicate by letter are sent successful confirmation of receipt message ACK to said base station controller BSC or radio network controller (RNC) after receiving said control signaling message,
Step (2.9), several portable terminals that communicate by letter begin to communicate by letter with transmission information according to the communication pattern that provides in the control signaling message.
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