CN1245845C - A method for downgoing signal transmission in mobile communication system - Google Patents
A method for downgoing signal transmission in mobile communication system Download PDFInfo
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- CN1245845C CN1245845C CNB021489599A CN02148959A CN1245845C CN 1245845 C CN1245845 C CN 1245845C CN B021489599 A CNB021489599 A CN B021489599A CN 02148959 A CN02148959 A CN 02148959A CN 1245845 C CN1245845 C CN 1245845C
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- carrier frequency
- frequency unit
- base station
- mobile communication
- communication system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention discloses a method for transmitting downlink signals in a mobile communication system, which comprises the following steps: a transceiver station of a base station sets a certain proportion of frequency carrying units as transmission diversity frequency carrying units; a mobile station transfers a measurement report to a base station controller, and the base station controller appoints another frequency carrying unit according to the measurement report and the condition of channels occupied by the mobile station and triggers the function of the radio frequency time slot frequency-hopping transmission diversity; after the another frequency carrying unit receives a command of the base station controller, the another frequency carrying unit transmits the same downlink signals to the mobile station through different antenna-feed units. On one hand, the present invention can enhance downlink coverage, what is more important, the present invention can lower the required power of the base station, so that network interference is reduced, network quality is improved, and the present invention is favorable for the stability of power control.
Description
Technical field
The present invention relates to mobile communication system, particularly the transmission technique field of downstream signal in the mobile communication system.
Technical background
In gsm mobile communication system, the base station belongs to wireless portion, realizes that mobile communication system is by wireless transmission between air interface and the travelling carriage and controlled function.
In the propagation of wireless signal process, because propagation distance and the time of advent different of wireless signal by different paths, when causing the multipath signal stack, the various situations that exist the composite signal amplitude to strengthen and weaken directly have influence on the quality of reception of receiver and the maximum propagation distance of wireless signal.Wherein, because propagation loss causes the decline of overall magnitude level, because multipath effect causes the quick variation of amplitude under same propagation distance situation, as shown in Figure 1.
In order to solve multi-path problem, the mode that adopts antenna diversity to receive more.Use two slave antennas to receive wireless signal simultaneously, when two slave antennas at a distance of certain distance (space diversity) or when adopting different polarised direction (polarization diversity), because the difference in radio signal propagation path, the composite signal that two slave antennas are received separately is uncorrelated, and what its amplitude weakened simultaneously has a remote possibility.Synthetic to the diversity signal that receives by separating the mediation diversity, can effectively solve multi-path problem.
At present in mobile communcations system, the base station adopts diversity receiving technology improving the propagation quality of travelling carriage to base station direction (up) more, thereby improves the speech quality of travelling carriage to the base station.Diversity technique generally comprises space diversity, polarization diversity and time diversity etc.Main principle is to produce two channels independently mutually, and it is uncorrelated mutually to make it decline.Thereby play the purpose of opposing decline.
And the speech quality of mobile communication comprises that travelling carriage arrives the speech quality of two parts of travelling carriage direction (descending) to base station direction (up) and base station, and effective coverage distance of base station is also determined simultaneously by up-downgoing.Multi-path problem receives same the existence for travelling carriage.
In order to solve the multi-path problem that travelling carriage receives, travelling carriage also can adopt diversity receiving technology.But owing to, in travelling carriage, adopt the possibility of diversity antenna and two cover receiving equipments lower to the having relatively high expectations of travelling carriage volume, power consumption.
So descending how to resist decline be more unmanageable problem in the gsm system always.The method that adopts is the transmitting power that increases the base station at present, guarantees descending covering by power headroom, reaches up-downgoing and covers suitable substantially.
At present, do not have practical transmit diversity techniques in the gsm system.
Summary of the invention
Purpose of the present invention just provides downstream signal transmission method in a kind of mobile communication system, can solve the multi-path problem in the downstream signal transmission course in the mobile communication system effectively.
Downstream signal transmission method in a kind of mobile communication system, base station are provided with a certain proportion of transmit diversity carrier frequency unit, adopt transmit diversity mode transmission signals to give travelling carriage.
The downstream signal transmission method further may further comprise the steps in the described mobile communication system:
A, base transceiver station are provided with a certain proportion of carrier frequency unit, as transmit diversity carrier frequency unit;
B, travelling carriage send measurement report to base station controller, and base station controller is specified another carrier frequency unit according to measurement report and the shared channel situation of travelling carriage, and trigger the function of radio frequency time slot frequency hopping transmit diversity;
Travelling carriage is given by the downstream signal that different air feedback unit emissions is identical in another carrier frequency unit described in c, the step b after the order of As-received station control.
Described step b further comprises: if the time slot of described another carrier frequency unit is occupied, then base station controller starts switching flow, this time slot is switched away, and abandon this corresponding receiving element in carrier frequency unit for information about.
Described step b further comprises: the information of the carrier frequency unit time slot that the switching technology acquisition of described another carrier frequency unit employing Frequency Hopping Bus is being conversed.
Described two carrier frequency unit fixing time slot of being separated by transmits.
Described two carrier frequency unit 2bit of being separated by transmits.
Adopted the present invention, can strengthen descending covering on the one hand, the more important thing is the power requirement that can reduce, thereby reduced network interferences, improved network quality, also helped the stability of power control the base station.
Description of drawings
Fig. 1 is the schematic diagram that declines in the wireless transmission environment;
Fig. 2 is a transmit diversity systems structure chart of the present invention;
Fig. 3 is transmit diversity and nothing emission diversity general effect contrast schematic diagram;
Fig. 4 is transmit diversity and the descending level contrast schematic diagram that does not have the emission diversity.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described.
As shown in Figure 2, in gsm mobile communication system, at first in the base station, increase corresponding air feedback unit, the radio-frequency channel of transmit diversity is provided, and disposes a certain proportion of carrier frequency unit, as transmit diversity carrier frequency unit; After the measurement report of travelling carriage was sent in the base station controller, base station controller was specified another particular frequency carrier unit according to the situation and the shared channel situation of travelling carriage of measurement report, triggered the function of radio frequency time slot frequency hopping transmit diversity.
This carrier frequency unit at the identical downstream signal of transmit diversity carrier frequency unit particular time-slot emission, reaches the purpose that increases descending covering after the order of As-received station control.If it is occupied to observe the particular time-slot of transmit diversity carrier frequency unit, then base station controller force start switching flow switches away this time slot, being abandoned by base station controller for information about of the corresponding receiving element of this carrier frequency.
Master control exchange transmission unit is transmitted to transmit diversity carrier frequency unit during the information of same that should be dealt in 1 conversation in the carrier frequency unit time slot by inner exchanging net table, switching network table by the base stations control transmission unit is realized the identical of two gap informations, the exchange of master control simultaneously transmission unit notice transmit diversity carrier frequency cell delay 2bit emission, the emission information of transmit diversity carrier frequency is fixed delay 2bit logically, realize temporal diversity, thereby increased the effect of transmit diversity.
Adopted the present invention, can strengthen descending covering on the one hand, the more important thing is the power requirement that can reduce, thereby reduced network interferences, improved network quality, also helped the stability of power control the base station.The test result that Fig. 3, Fig. 4 show shows that descending covering level on average increases 3db, simultaneously the also corresponding increase of coverage distance.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1, downstream signal transmission method in a kind of mobile communication system is characterized in that:
A, base transceiver station are provided with a certain proportion of carrier frequency unit, as transmit diversity carrier frequency unit;
B, travelling carriage send measurement report to base station controller, and base station controller is specified another carrier frequency unit according to measurement report and the shared channel situation of travelling carriage, and trigger the function of radio frequency time slot frequency hopping transmit diversity;
Travelling carriage is given by the downstream signal that different air feedback unit emissions is identical in another carrier frequency unit described in c, the step b after the order of As-received station control.
2, downstream signal transmission method in the mobile communication system as claimed in claim 1, it is characterized in that: step b further comprises: if the time slot of described another carrier frequency unit is occupied, then base station controller starts switching flow, this time slot is switched away, and abandon this corresponding receiving element in carrier frequency unit for information about.
3, downstream signal transmission method in the mobile communication system as claimed in claim 1 or 2, it is characterized in that: step b further comprises: the information of the carrier frequency unit time slot that the switching technology acquisition of described another carrier frequency unit employing Frequency Hopping Bus is being conversed.
4, downstream signal transmission method in the mobile communication system as claimed in claim 1, it is characterized in that: step c further comprises: two carrier frequency unit fixing time slot of being separated by transmits.
5, downstream signal transmission method in the mobile communication system as claimed in claim 4 is characterized in that: two carrier frequency unit 2bit of being separated by transmits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021489599A CN1245845C (en) | 2002-11-14 | 2002-11-14 | A method for downgoing signal transmission in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021489599A CN1245845C (en) | 2002-11-14 | 2002-11-14 | A method for downgoing signal transmission in mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1501728A CN1501728A (en) | 2004-06-02 |
| CN1245845C true CN1245845C (en) | 2006-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021489599A Expired - Lifetime CN1245845C (en) | 2002-11-14 | 2002-11-14 | A method for downgoing signal transmission in mobile communication system |
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| Country | Link |
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| CN (1) | CN1245845C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1953347B (en) * | 2006-09-15 | 2011-04-20 | 华为技术有限公司 | Wireless signal transmitting, receiving method and system |
| US9635644B2 (en) * | 2012-08-10 | 2017-04-25 | Qualcomm Incorporated | Downlink coverage enhancements |
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2002
- 2002-11-14 CN CNB021489599A patent/CN1245845C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1501728A (en) | 2004-06-02 |
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