CN1384678A - Demand assignment transmission method in mobile communication system - Google Patents
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- CN1384678A CN1384678A CN 01112845 CN01112845A CN1384678A CN 1384678 A CN1384678 A CN 1384678A CN 01112845 CN01112845 CN 01112845 CN 01112845 A CN01112845 A CN 01112845A CN 1384678 A CN1384678 A CN 1384678A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
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Abstract
The demand assignment transmission method in mobile communication system is based on mobile communication system and satellite transmission system. The mobile communication system includes several subsystems, which complete data transmission via satellite transmission system. The signal and signaling of the data in the said subsystems are converted, and the satellite links of satellite telephone in satellite transmission system are distributed dynamically. The said method saves the bandwidth of the network.
Description
The present invention relates to mobile communication and satellite communication technology, more specifically refer in mobile communcations system, realize the method for satellite transmits bandwidth distribution according to need (DAMA), when utilizing this method can be implemented in transport service between the subsystem interface of mobile communcations system, the distribution according to need of satellite transmits bandwidth.
In mobile communcations systems such as GSM, CDMA, WCDMA, CDMA2000, the transfer of data between subsystem interface need be finished by transmission system.Interface between these subsystems includes but are not limited to the A mouth between Abis mouth, base station controller (BSC) and mobile switching centre (MSC) between base transceiver station in the gsm system (BTS) and base station controller (BSC), the Iu mouth between the lub mouth between base station in the WCDMA system (NodeB) and radio network controller (RNC), radio network controller (RNC) and core net (CN); A mouth between the Abis mouth between base transceiver station in the CDMA2000 system (BTS) and base station controller (BSC), base station controller (BSC) and mobile switching centre (MSC).
Transfer of data between the mobile communcations system subsystem interface need guarantee certain transmission bandwidth and transmission quality, and the latter comprises the error rate, time delay, shake etc.
Transmission means commonly used at present comprises the optical fiber in the wire transmission, the X digital subscriber line (XDSL) that short distance is adopted, the cable that closely adopts, the microwave in the wireless transmission, satellite etc., and these transmission means have advantage and application space separately.
Extreme terrain areas such as, desert scarcely populated at some, island, utilizing satellite communication to solve transmission problem is a kind of quick, effective, economic means.The satellite transmits networking diagram that the Abis mouth is used between base transceiver station (BTS) and base station controller (BSC) in gsm system can be earlier referring to shown in Figure 1, and Abis mouth satellite transmits is in some regional practical application at present.
Satellite Communication System is made up of satellite and terrestrial transmission equipment.Wherein terrestrial transmission equipment comprises the satellite-transmission gear be made up of modulator-demodulator and transceiver, antenna etc.
Area coverage is wide though satellite communication has, the position of building a station is subjected to advantages such as the influence of topography is little, ground station's mobility is strong, but the satellite link lease expenses is higher simultaneously, the bi-directional data of ground 64k bandwidth, because the difference of satellite-transmission gear, the bandwidth of broadcasting TV programs by satellite needs 160-190kHz approximately, year ten thousand dollars of about 0.7-0.9 of satellite link rent (1MHz satellite bandwidth annual rent is ten thousand dollars of 4-5).
Owing to data traffic between the mobile communication subsystem interface is big, real-time is had relatively high expectations, if adopt the transmission between satellite communication solution interface merely, the satellite link lease expenses problem of long-term great number is to hinder the main bottleneck that this mode is promoted.
The purpose of this invention is to provide a kind of demand assigned transmission method of in mobile communcations system, realizing, utilize this method can be implemented in the application of mobile communcations system, save the satellite transmits bandwidth and save long-term great number satellite link lease expenses.
To achieve these goals, the demand assigned transmission method of realizing in mobile communcations system of the present invention adopts following technical scheme: this method is based on mobile communcations system and sts satellite transmission system, comprise the plurality of sub system in the mobile communcations system, transfer of data between each subsystem can be finished by Satellite Communication System, the data of above-mentioned subsystem are carried out signal and signaling conversion, and the satellite phone of sts satellite transmission system is realized the dynamic assignment of satellite link.
This method further may further comprise the steps:
A with the conversion by signaling and signal of the data of a subsystem A of mobile communcations system output, inputs to the satellite phone interface of this subsystem A one side;
B, the satellite phone of described sts satellite transmission system launch through modulating after the data after this subsystem A conversion and broadcast TV programs by satellite, and utilize the dynamic assignment of the demand assignment function realization satellite bandwidth of satellite phone simultaneously;
C, satellite finish forwarding to the described signal of broadcasting TV programs by satellite of step b again;
D, in the mobile communcations system and satellite phone corresponding another subsystem of the described subsystem A of step a B side the signal after to the forwarding among the step c carries out receiving demodulation and exports the subsystem B of mobile communcations system to, finishes two transfer of data between subsystem A, B.
When above-mentioned mobile communcations system is Golbal System for Mobile Communic-ations, two mobile communication subsystems are respectively base station controller and base transceiver station, adopt the preassignment mode to transmit to wireless signaling channel in the data between base station controller and the base transceiver station and Operation and maintenance link, voice channel adopts the distribution according to need transmission.
When the satellite phone that adopts had 2/4 line ordinary telephone subscriber line interface, described base station controller was converted into according to the request for allocation of voice channel and meets dual-tone multifrequency formatted data input satellite phone.
When the satellite phone that adopts had digital interface, described base station controller was converted into according to the request for allocation of voice channel and meets message transmission rate formatted data input satellite phone.
When above-mentioned mobile communcations system is broadband CDMA system, two mobile communication subsystems are respectively base station controller and base transceiver station, adopt the preassignment mode to transmit to signaling channel in the data between base station controller and the base transceiver station and Operation and maintenance link, voice channel adopts the distribution according to need transmission.
When the satellite phone that adopts had 2/4 line ordinary telephone subscriber line, described base station controller was converted into according to the request for allocation of voice channel and meets dual-tone multifrequency formatted data input satellite phone.
When the satellite phone that adopts had digital interface, described base station controller was converted into according to the request for allocation of voice channel and meets message transmission rate formatted data input satellite phone.
Owing to adopted the above-mentioned demand assigned transmission method of in mobile communcations system, realizing, when finishing between subsystem in the mobile communication transfer of data by Satellite Communication System, the data of its subsystem are carried out signal and signaling conversion, and realize the dynamic assignment of satellite link by the satellite phone of sts satellite transmission system.Therefore, transmission bandwidth between each subsystem only when being arranged, is just distributed in call request, and the whole network bandwidth is dynamically adjusted between each subsystem according to demand, the calling flow of each subsystem synchronization is different, after the bandwidth unified distribution, scale and benefit will make puts in order the wide saving of guipure; Suitably increase the satellite repeater call loss of bringing owing to distribution according to need, the bandwidth of further having saved whole net simultaneously.
Below in conjunction with drawings and Examples, method of the present invention is described in further detail:
Fig. 1 is the satellite transmits networking schematic diagram in Golbal System for Mobile Communic-ations that adopts at present.
Fig. 2 is the inventive method schematic flow sheet.
Fig. 3 is transmitted in one of networking schematic diagram in the mobile communcations system for satellite after adopting method of the present invention.
Fig. 4 is transmitted in the Golbal System for Mobile Communic-ations call flow schematic diagram after the networking for adopting after the method for the present invention satellite.
Fig. 5 is transmitted in two of networking schematic diagram in the mobile communcations system for adopting satellite after the method for the present invention.
The present invention realizes that in mobile communcations system the method for satellite transmits bandwidth distribution according to need (DAMA) is based on mobile communcations system and sts satellite transmission system, comprise the plurality of sub system in the mobile communcations system, transfer of data between each subsystem is finished by Satellite Communication System, the data of above-mentioned subsystem are carried out signal and signaling conversion, and the satellite phone of sts satellite transmission system is realized the dynamic assignment of satellite link.
See also shown in Figure 2ly, this method further may further comprise the steps:
A with the conversion by signaling and signal of the data of the output of mobile communcations system one subsystem A, inputs to the satellite phone interface of this subsystem A one side;
B, the satellite phone of described sts satellite transmission system (subsystem A flank guard star phone) launch through modulating after the data after this subsystem A conversion and broadcast TV programs by satellite, and utilize the dynamic assignment of the demand assignment function realization satellite bandwidth of satellite phone simultaneously;
C, satellite finish forwarding to the described signal of broadcasting TV programs by satellite of step b again;
D, in the mobile communcations system and satellite phone corresponding another subsystem of the described subsystem A of step a B side the signal after to the forwarding among the step c carries out receiving demodulation and exports the subsystem B of mobile communcations system to, finishes the transfer of data between two subsystem A and the B.
Please again in conjunction with shown in Figure 3, when above-mentioned mobile communcations system is Golbal System for Mobile Communic-ations (GSM), two mobile communication subsystems are respectively base station controller (BSC) and base transceiver station (BTS), data between base station controller (BSC) and the base transceiver station (BTS) are carried out signal and signaling conversion, wireless signaling channel in the data and Operation and maintenance link adopt the preassignment mode to transmit, and voice channel adopts the distribution according to need transmission.Comprise satellite-transmission gear, antenna, satellite in the sts satellite transmission system, satellite phone is contained among the satellite-transmission gear again.
From the call flow of GSM as can be known, base transceiver station (BTS) side can directly not initiated assignment voice channel (TCH), and the request for allocation of voice channel (TCH) is initiated by base station controller (BSC).During mobile subscriber's caller, the call signaling that base transceiver station (BTS) side is initiated is delivered to base station controller (BSC) by wireless signaling channel (RSL), when finishing when continuing by base station controller (BSC) assignment voice channel (TCH); When the mobile subscriber is called, after call signaling is delivered to base station controller (BSC), by base station controller (BSC) assignment voice channel (TCH).Thereby, base station controller (BSC) need be finished according to the distribution according to need satellite link function of calling out with the interface unit of satellite-transmission gear, base transceiver station (BTS) only needs according to voice channel (TCH) request for allocation that receive and that base station controller (BSC) is sent with the interface unit of satellite-transmission gear, application satellite link bandwidth.
The part satellite phone has 2/4 ordinary telephone subscriber line interface, i.e. E/M (being talked about/send words) interface.
Please again in conjunction with shown in Figure 4, when the satellite phone that adopts has 2/4 line ordinary telephone subscriber line interface, described base station controller is converted into according to the request for allocation of voice channel and meets dual-tone multifrequency formatted data input satellite phone, and satellite phone is realized the dynamic assignment of satellite link.
During specific implementation distribution according to need, base station controller (BSC) side distribution according to need interface unit is according to the assignment situation of voice channel (TCH), before base transceiver station (BTS) sends voice channel (TCH) assignment, send the satellite channel request to satellite-transmission gear; Voice channel (TCH) activation command that base station controller (BSC) side interface unit As-received station control (BSC) sends, convert thereof into the telephone dial-up signal of Dual Tone Multifrequency form after, deliver to the DAMA telephony interface of satellite-transmission gear; The satellite-transmission gear master control system is distributed satellite channel, voice channel (TCH) link establishment of base station controller (BSC) and base transceiver station (BTS); When end of conversation, interface unit converts voice channel (TCH) release command to on-hook signal and send satellite-transmission gear, and the satellite-transmission gear master control system discharges satellite channel.
Distribution according to need (DAMA) interface unit needs to contain the signaling that voice channel (TCH) activates request, is converted into the telephone dial-up signal signaling that meets the Dual Tone Multifrequency form, and tool this finish the continuing of voice channel (TCH) of subsequent allocations.Interface unit wherein can be with the veneer such as the realizations such as Main Processing Unit (MPU) plate, data transmission unit (DTM), user's plate of exchange.
Base transceiver station (BTS) side distribution according to need interface unit is realized simple relatively, only needs according to voice channel (TCH) request for allocation that receive, that base station controller (BSC) is sent application satellite link bandwidth.Signaling conversion, is torn chain etc. open at the application of satellite link, and is identical with base station controller (BSC) side distribution according to need interface unit realization flow.
When the satellite phone that adopts had digital interface, described base station controller was converted into according to the request for allocation of voice channel and meets message transmission rate formatted data input satellite phone.
Have digital interface for some satellite phone, its dynamic assignment implementation procedure can adopt bandwidth, linked object to determine mode in advance.Promptly the bandwidth of the satellite link of needs having been opened in advance, point to and make definitions, only application is open-minded when opening demand.Signaling adopts the instruction of data transmission rate (DTR) level.
Need increase the interface unit of base transceiver station (BTS), base station controller (BSC) and satellite-transmission gear during realization.
Because some satellite-transmission gear maximum can provide the data-interface of 128kbps, and the Abis mouth needs 5 * 64kbps during 2 carrier frequency, and 3 carrier frequency need 7 * 64kbps data bandwidth, therefore, need a plurality of satellite-transmission gears of control to use simultaneously.
Base station controller (BSC) side distribution according to need interface unit before base transceiver station (BTS) sends the TCH channel assignment, sends satellite channel request to satellite-transmission gear according to TCH Channel Assignment situation; Base station controller (BSC) side interface unit is converted to the instruction that meets data transmission rate (DTR) level with solicited message, delivers to distribution according to need (DAMA) telephony interface of satellite-transmission gear; The satellite-transmission gear master control system is distributed satellite channel, the TCH link establishment of base station controller (BSC) and base transceiver station (BTS); Work as end of conversation, interface unit converts the TCH release command to on-hook signal and send satellite-transmission gear, and the satellite-transmission gear master control system discharges satellite channel.
The distribution according to need interface unit need be converted to the signaling of channel request the instruction that meets the DTR level and send to satellite-transmission gear, finishes the control to a plurality of satellite-transmission gears simultaneously.
Please again in conjunction with shown in Figure 5, when above-mentioned mobile communcations system is broadband CDMA system (WCDMA), two mobile communication subsystems are respectively base station controller (RNC) and base transceiver station (NodeB), data are carried out signal and signaling conversion between radio network controller (RNC) and the base transceiver station (NodeB), signaling channel in the data and Operation and maintenance link adopt the preassignment mode to transmit, and voice channel adopts the distribution according to need transmission.
From method of the present invention as can be seen, the present invention has following effect:
For mobile communcations system, no matter be gsm system, or the WCDMA system, distribution according to need (DAMA) can be saved the bandwidth of satellite transmits.
At first, the carrier frequency number of base station can not be finished the convergence fully to number of users, generally all leaves more than needed.For the lower area of telephone traffic, the meaning of this point is very big.
Secondly, be based on the scale effect of statistics.From the statistics angle owing to allow certain call loss, determine the base station carrier number Irish number and can number of service subscribers, both ratios are non-linear relations.Promptly, can obtain the more growth of vast scale of number of users, thereby obtain scale effect based on statistics by enlarging the carrier frequency number.By distribution according to need, can think integrated to a plurality of site users quantity, to save the carrier frequency number be the purpose of transmission bandwidth thereby reach.The website number is many more, and effect is obvious more.
For scale effect, be analyzed as follows,
TCH timeslot number N, we consider 2,4,6,8,12 totally 5 kinds of situations.
Website is counted n, and consideration 5,10,20,50,100 is totally 5 kinds of situations.
Call loss BT comprises wireless call loss BT, generally gets 2%, 5%; Adopt the call loss BT ' of DAMA, generally get 1%, 2%.
1, computational process is as follows:
When not adopting DAMA, need total TCH to count the non-DAMA=n * N of N;
When adopting DAMA, the single station of single station telephone traffic A can be found according to Ireland table by N, BT; Total traffic A is total=the single station of n * A; Need total TCH count NDAMA, can be total, BT ' finds according to Ireland table by A.
Adopt the income of DAMA
The non-DAMA/NDAMA of=N.
2, the result is as follows: 1) B
T=2%, B
T'=1% o'clock,
Be listed as follows
2) B
T=2%, B
T'=2% o'clock,
Be listed as follows
3) B
T=5%, B
T'=1% o'clock,
Be listed as follows
4) B
T=5%, B
T'=2% o'clock,
Be listed as follows
| ?1×64k | ?2×64k | ?2×64k | ?3×64k | ?4×64k | |
| ?n＝5 | ?2 | ?1.67 | ?1.5 | ?1.43 | ?1.33 |
| ?n＝10 | ?2.86 | ?2.11 | ?1.82 | ?1.63 | ?1.48 |
| ?n＝20 | ?4 | ?2.5 | ?2.03 | ?1.82 | ?1.58 |
| ?n＝50 | ?5.26 | ?2.89 | ?2.27 | ?1.98 | |
| ?n＝100 | ?6.06 | ?3.13 |
| ?1×64k | ?2×64k | ?2×64k | ?3×64k | ?4×64k | |
| ?n＝5 | ?2.5 | ?1.82 | ?1.67 | ?1.54 | ?1.4 |
| ?n＝10 | ?3.33 | ?2.35 | ?1.94 | ?1.74 | ?1.58 |
| ?n＝20 | ?4.44 | ?2.67 | ?2.14 | ?1.88 | ?1.64 |
| ?n＝50 | ?5.56 | ?3.03 | ?2.34 | ?2.04 | |
| ?n＝100 | ?6.45 | ?3.28 |
| ?1×64k | ?2×64k | ?2×64k | ?3×64k | ?4×64k | |
| ?n＝5 | ?1.67 | ?1.43 | ?1.25 | ?1.21 | ?1.15 |
| ?n＝10 | ?2 | ?1.67 | ?1.46 | ?1.36 | ?1.25 |
| ?n＝20 | ?2.86 | ?1.9 | ?1.62 | ?1.48 | ?1.33 |
| ?n＝50 | ?3.45 | ?2.17 | ?1.79 | ||
| ?n＝100 | ?3.92 | ?2.33 |
| ?1×64k | ?2×64k | ?2×64k | ?3×64k | ?4×64k | |
| ?n＝5 | ?1.67 | ?1.67 | ?1.43 | ?1.43 | ?1.33 |
| ?n＝10 | ?2.22 | ?2 | ?1.71 | ?1.57 | ?1.41 |
| ?n＝20 | ?2.86 | ?2.22 | ?1.85 | ?1.67 | ?1.48 |
| ?n＝50 | ?3.7 | ?2.44 | ?1.97 | ||
| ?n＝100 | ?4.17 | ?2.56 |
Annotate: partial data is excessive, can't look into Ireland table.
As seen, under multi-site, low TCH configuring condition, adopt distribution according to need meaning maximum.With due regard to the call loss of Yin Ruing can obtain certain income; But by the call loss of increase system, income is not obvious, and unfavorable to system.
Can see that the present invention also has following characteristics:
Change less to existing mobile communication subsystem interface;
The interface of satellite phone is similar for different satellite-transmission gears, and is lower with the correlation of product;
The minimum resolution bandwidth of the interface of satellite-transmission gear DAMA phone is 16k, and GSM voice coding bandwidth also is 16k, adopts this kind mode can save to the full extent satellite bandwidth. If do not consider other expenses of satellite-transmission gear, actual result will be calculated meet better with above-mentioned theory.
Claims (8)
1, a kind of demand assigned transmission method of in mobile communcations system, realizing, this method is based on mobile communcations system and sts satellite transmission system, comprise the plurality of sub system in the mobile communcations system, transfer of data between each subsystem can be finished by Satellite Communication System, it is characterized in that: the data of above-mentioned subsystem are carried out signal and signaling conversion, and realize the dynamic assignment of satellite link by the satellite phone of sts satellite transmission system.
2, the demand assigned transmission method of realizing in mobile communcations system as claimed in claim 1 is characterized in that this method further may further comprise the steps:
A with the conversion by signaling and signal of the data of a subsystem A of mobile communcations system output, inputs to the satellite phone interface of this subsystem A one side;
B, the satellite phone of described sts satellite transmission system launch through modulating after the data after this subsystem A conversion and broadcast TV programs by satellite, and utilize the dynamic assignment of the demand assignment function realization satellite bandwidth of satellite phone simultaneously;
C, satellite finish forwarding to the described signal of broadcasting TV programs by satellite of step b again;
D, in the mobile communcations system and satellite phone corresponding another subsystem of the described subsystem A of step a B side, signal after the forwarding among the step c is carried out receiving demodulation and exports the subsystem B of mobile communcations system to, finish two transfer of data between subsystem A, B.
3, the demand assigned transmission method of in mobile communcations system, realizing as claimed in claim 2, it is characterized in that, when above-mentioned mobile communcations system is Golbal System for Mobile Communic-ations, two mobile communication subsystems are respectively base station controller and base transceiver station, adopt the preassignment mode to transmit to wireless signaling channel in the data between base station controller and the base transceiver station and Operation and maintenance link, voice channel adopts the distribution according to need transmission.
4, the demand assigned transmission method of in mobile communcations system, realizing as claimed in claim 3, it is characterized in that, when the satellite phone that adopts had 2/4 line ordinary telephone subscriber line interface, described base station controller was converted into according to the request for allocation of voice channel and meets dual-tone multifrequency formatted data input satellite phone.
5, the demand assigned transmission method of in mobile communcations system, realizing as claimed in claim 3, it is characterized in that, when the satellite phone that adopts had digital interface, described base station controller was converted into according to the request for allocation of voice channel and meets message transmission rate formatted data input satellite phone.
6, the demand assigned transmission method of in mobile communcations system, realizing as claimed in claim 2, it is characterized in that, when above-mentioned mobile communcations system is broadband CDMA system, two mobile communication subsystems are respectively base station controller and base transceiver station, adopt the preassignment mode to transmit to signaling channel in the data between base station controller and the base transceiver station and Operation and maintenance link, voice channel adopts the distribution according to need transmission.
7, the demand assigned transmission method of in mobile communcations system, realizing as claimed in claim 6, it is characterized in that, when the satellite phone that adopts had 2/4 line ordinary telephone subscriber line, described base station controller was converted into according to the request for allocation of voice channel and meets dual-tone multifrequency formatted data input satellite phone.
8, the demand assigned transmission method of in mobile communcations system, realizing as claimed in claim 6, it is characterized in that, when the satellite phone that adopts had digital interface, described base station controller was converted into according to the request for allocation of voice channel and meets message transmission rate formatted data input satellite phone.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011128453A CN1146263C (en) | 2001-05-09 | 2001-05-09 | Demand assignment transmission method in mobile communication system |
| PCT/CN2002/000094 WO2002091759A1 (en) | 2001-05-09 | 2002-03-25 | Transmission method for achieving dama in a mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011128453A CN1146263C (en) | 2001-05-09 | 2001-05-09 | Demand assignment transmission method in mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1384678A true CN1384678A (en) | 2002-12-11 |
| CN1146263C CN1146263C (en) | 2004-04-14 |
Family
ID=4659592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011128453A Expired - Fee Related CN1146263C (en) | 2001-05-09 | 2001-05-09 | Demand assignment transmission method in mobile communication system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1146263C (en) |
| WO (1) | WO2002091759A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440989C (en) * | 2004-03-10 | 2008-12-03 | 华为技术有限公司 | System and method for implementing satellite transmission |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6044070A (en) * | 1997-10-15 | 2000-03-28 | Ericsson Inc. | Remote connection control using a tunneling protocol |
| WO1999048308A1 (en) * | 1998-03-18 | 1999-09-23 | Aeris Communications, Inc. | Method and apparatus for communicating application specific data over wireless communication networks |
-
2001
- 2001-05-09 CN CNB011128453A patent/CN1146263C/en not_active Expired - Fee Related
-
2002
- 2002-03-25 WO PCT/CN2002/000094 patent/WO2002091759A1/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440989C (en) * | 2004-03-10 | 2008-12-03 | 华为技术有限公司 | System and method for implementing satellite transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002091759A1 (en) | 2002-11-14 |
| CN1146263C (en) | 2004-04-14 |
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