CN101594661A - A kind of method of downlink transmission, system, base station and subscriber equipment - Google Patents
A kind of method of downlink transmission, system, base station and subscriber equipment Download PDFInfo
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- CN101594661A CN101594661A CNA2008101130651A CN200810113065A CN101594661A CN 101594661 A CN101594661 A CN 101594661A CN A2008101130651 A CNA2008101130651 A CN A2008101130651A CN 200810113065 A CN200810113065 A CN 200810113065A CN 101594661 A CN101594661 A CN 101594661A
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Abstract
The present invention proposes a kind of method of downlink transmission, system, base station and subscriber equipment, wherein method comprises: the pilot configuration parameter that scene is optimized is determined according to the place scene in the base station, the indication information notifying user equipment of the pilot configuration parameter of the scene of determining being optimized by broadcast channel; The signal emission is carried out according to the pilot configuration parameter of described scene optimization in the base station on the running time-frequency resource the running time-frequency resource shared except that broadcast channel; Subscriber equipment obtains the pilot configuration parameter that described scene is optimized, and according to the pilot configuration parameter of described scene optimization the down channel except that broadcast channel is carried out channel estimating.The present invention can reduce pilot-frequency expense under the prerequisite that guarantees systematic function, improve resource utilization ratio.
Description
Technical field
The present invention relates to the broadband wireless communications field, relate in particular to a kind of method of downlink transmission, system, base station and subscriber equipment.
Background technology
Broadband wireless communications will become the main developing direction of order back mobile communication.In international senior mobile communication (IMT-Advanced) system of International Telecommunication Association (ITU), the bandwidth of maximum wireless communication can reach 100MHz.By broadband wireless communications, the user can enjoy data at a high speed and download, shopping online, mobile video chat, the wireless mobile service that mobile TV etc. are numerous.Its maximum transmission rate can reach 1Gbps, and design object is to satisfy the very big demand of user for wireless mobile communications.
The IMT-Advanced system adopts the coherent demodulation mode, utilizes frequency pilot sign to carry out channel estimating.Frequency pilot sign takies transmitting terminal and the known signal of receiving terminal in the running time-frequency resource, thus the convenient channel condition information that obtains exactly.Pilot-frequency expense is relevant with channel status, and channel status has determined pilot-frequency expense.Pilot tone takies running time-frequency resource and can cause channel estimating inaccurate very little, and pilot tone takies running time-frequency resource then can cause the wasting of resources too much, reduces the system spectrum utilance.
At present, long evolving system (LTE) has provided pilot configuration, and this pilot configuration is not considered different application scene (being channel status), but the peak performance index that only can support according to typical urban scene (TU) environment designs.Shown in Figure 1A～Fig. 1 C, Figure 1A to Fig. 1 C is respectively the pilot configuration schematic diagram of prior art single antenna, 2 antennas and 4 antennas.By Figure 1A as seen, the expense of frequency pilot sign is 5% of a whole downlink resource during single antenna; By Figure 1B as seen, the expense of frequency pilot sign is 10% of a whole downlink resource during 2 antennas; By Fig. 1 C as seen, the expense of frequency pilot sign is 15% of a whole downlink resource during 4 antennas.
As seen, the pilot configuration that above-mentioned LTE proposes is only at the TU channel design, only in the TU channel, can obtain the compromise of preferable performance and pilot-frequency expense, still, will bring the problem of systematic function decline or waste pilot-frequency expense when such pilot configuration is applied to other scene.Such as in the mountain area, its basic characteristics are that multidiameter delay is long, translational speed is limited, because frequency selectivity was comparatively remarkable when multidiameter delay was longer, need the density of frequency pilot sign on frequency domain to increase, still the pilot configuration of use and TU channel circumstance coupling will cause systematic function to descend at this moment; And for example at hot zones, its basic characteristics are that multidiameter delay is shorter, translational speed is very low, frequency selectivity and time selectivity all can obviously descend, can reduce greatly frequency pilot sign on frequency domain density and can not have influence on systematic function, still use this moment with the pilot configuration of TU channel circumstance coupling and will waste pilot-frequency expense.
Summary of the invention
The embodiment of the invention proposes a kind of downlink transmission method, and this method can reduce pilot-frequency expense under the prerequisite that guarantees systematic function, improve resource utilization ratio.
The embodiment of the invention proposes a kind of downlink transmission system, base station and subscriber equipment, can reduce pilot-frequency expense under the prerequisite that guarantees systematic function, improves resource utilization ratio.
Technical scheme of the present invention is achieved in that
A kind of method of downlink transmission is characterized in that, described method comprises:
The pilot configuration parameter that scene is optimized is determined according to the place scene in the base station, the indication information notifying user equipment of the pilot configuration parameter of the scene of determining being optimized by broadcast channel; The signal emission is carried out according to the pilot configuration parameter of described scene optimization in the base station on the running time-frequency resource the running time-frequency resource shared except that broadcast channel;
Subscriber equipment obtains the pilot configuration parameter that described scene is optimized, and according to the pilot configuration parameter of described scene optimization the down channel except that broadcast channel is carried out channel estimating.
A kind of base station comprises:
Determination module is used for determining the pilot configuration parameter that scene is optimized according to place, base station scene;
Notification module is used for the indication information notifying user equipment of the pilot configuration parameter the scene determined optimized by broadcast channel;
Transmitter module is used for carrying out the signal emission according to the pilot configuration parameter of described scene optimization on the running time-frequency resource the running time-frequency resource shared except that broadcast channel.
A kind of subscriber equipment comprises:
Acquisition module is used to obtain the pilot configuration parameter that the determined scene in base station is optimized;
Channel estimation module is used for according to the pilot configuration parameter of scene optimization the running time-frequency resource except that broadcast channel being carried out channel estimating.
As seen, method, system, base station and subscriber equipment that the present invention proposes, select the pilot configuration parameter of corresponding scene optimization at different scenes, the pilot configuration parameter that the scene of selecting is optimized is passed through the broadcast channel notifying user equipment, carry out the signal emission according to the pilot configuration parameter of scene optimization on the running time-frequency resource the running time-frequency resource shared except that broadcast channel, subscriber equipment just can carry out channel estimating to the down channel except that broadcast channel according to the pilot configuration parameter of scene optimization.Because the pilot configuration parameter of scene optimization designs at different scenes, thereby can under the prerequisite that guarantees systematic function, reduce pilot-frequency expense, improve resource utilization ratio.
Description of drawings
Figure 1A is the pilot configuration schematic diagram of prior art single antenna;
The pilot configuration schematic diagram of Figure 1B prior art 2 antennas;
The pilot configuration schematic diagram of Fig. 1 C prior art 4 antennas;
Fig. 2 is the single antenna pilot configuration schematic diagram of embodiment of the invention high-speed mobile environment scene;
Fig. 3 A is the single antenna pilot configuration schematic diagram of embodiment of the invention typical urban scene;
Fig. 3 B is 2 antenna pilot structural representations of embodiment of the invention typical urban scene;
Fig. 3 C is 4 antenna pilot structural representations of embodiment of the invention typical urban scene;
Fig. 4 A is the single antenna pilot configuration schematic diagram of rural area, embodiment of the invention suburb scene;
Fig. 4 B is 2 antenna pilot structural representations of rural area, embodiment of the invention suburb scene;
Fig. 4 C is 4 antenna pilot structural representations of rural area, embodiment of the invention suburb scene;
Fig. 5 A is the single antenna pilot configuration schematic diagram of the abominable urban settings in embodiment of the invention mountain area;
Fig. 5 B is 2 antenna pilot structural representations of the abominable urban settings in embodiment of the invention mountain area;
Fig. 5 C is 4 antenna pilot structural representations of the abominable urban settings in embodiment of the invention mountain area;
Fig. 6 A is the single antenna pilot configuration schematic diagram of embodiment of the invention hot zones scene;
Fig. 6 B is 2 antenna pilot structural representations of embodiment of the invention hot zones scene;
Fig. 6 C is 4 antenna pilot structural representations of embodiment of the invention hot zones scene;
Fig. 7 is the flow chart of embodiment of the invention downlink transmission method.
Embodiment
In order to carry out downlink transfer at different scenes, at first need to consider the pilot configuration scheme relevant with scene, under different scenes, use different pilot configurations.
The pilot configuration parameter comprises: frequency domain interval and time domain interval.The meter frequency domain interval is D
f, time domain interval is D
t, according to sampling thheorem, D
fAnd D
tShould satisfy following relational expression:
τ wherein
MaxBe maximum multipath time delay, f
D maxBe maximum Doppler expansion, f
D maxBe directly proportional with the highest translational speed in the scene.β
fAnd β
tBe respectively the frequency domain oversample factor and the time domain oversampling factor, usually, β
fAnd β
tGet approximately 2 o'clock can obtained performance and pilot-frequency expense compromise preferably.
Consider five kinds of typical scenes: high-speed mobile environment (as high-speed railway/magnetic suspension train), typical urban, rural area, suburb, abominable city, mountain area, hot zones.Calculate the required pilot configuration parameter of different scenes according to the above-mentioned relation formula.Referring to table 1, table 1 is the characteristics of five kinds of typical scenes and because of the required pilot configuration parameter of its characteristics.
Table 1
With the high-speed mobile environment is example, is characterized in that multidiameter delay is less, is generally less than 1.3 μ s; Maximum speed is bigger, and greater than 350Km/h, in order to satisfy system channel estimation performance in the high-speed mobile environment, its pilot configuration parameter need satisfy certain requirement, is specially: the pilot tone frequency domain interval is 450KHz to the maximum, and the pilot tone time domain interval is 450 μ s to the maximum.
For the convenience of the system parameter setting of LTE and the robustness that keeps systematic function, the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in the above-mentioned table 1 are adjusted, determine the pilot configuration parameter of every kind of scene, concrete as table 2.In the table 2, the pilot tone frequency domain interval of different scenes and pilot tone time domain interval generally become the multiple relation, and satisfy the requirement of the required pilot configuration parameter of different scenes in the table 1.
| Scene | The pilot tone frequency domain interval | The pilot tone time domain interval |
| High-speed mobile environment | 360KHz | 142 μ s or 213 μ s |
| Typical urban | 90KHz | 0.5ms |
| The rural area, suburb | 180KHz | 0.5ms |
| Abominable city, mountain area | 45KHz | 0.5ms |
| Hot zones | 360KHz | 1ms |
Table 2
Below describe respectively at above-mentioned five kinds of typical scenes:
(1) high-speed mobile environment, such as high-speed railway, magnetic suspension, highway has the direct projection footpath, 70% received signal energy is directly obtained by direct projection, therefore in this scene, correlation between channels is very strong, and to advance to have more (MIMO) multithread transmission performances bad more, the use single-antenna transmission gets final product, and perhaps uses beam form-endowing method.
Referring to Fig. 2, Fig. 2 is the single antenna pilot configuration schematic diagram of embodiment of the invention high-speed mobile environment scene.As seen from Figure 2, the pilot tone frequency domain is spaced apart 360KHz, and the pilot tone time domain interval is 142 μ s (i.e. the gap length of 2 OFDM symbols) or 213 μ s (i.e. the gap length of the symbol of 3 OFDM).The single antenna pilot-frequency expense is 1.8% in this case.
(2) typical urban scene, because high building stands in great numbers, the received signal energy is generally obtained by the reflection footpath, and the time domain ratio is bigger, and translational speed is limited, generally can not surpass 120Km/h, therefore in this scene, can use MIMO, carry out the multithread transmission, improve power system capacity, therefore use many antenna emissions.
Referring to Fig. 3 A to Fig. 3 C, Fig. 3 A to Fig. 3 C is respectively single antenna, 2 antennas and the 4 antenna pilot structural representations of embodiment of the invention typical urban scene.By Fig. 3 A to Fig. 3 C as seen, the pilot tone frequency domain is spaced apart 90KHz, and the pilot tone time domain interval is 0.5ms.Wherein, the situation of 2 antennas is main situations about considering, in general urban environment, can not guarantee to support 4 streams.The single antenna pilot-frequency expense is that 2.4%, 2 antenna pilot expense is 4.8%.
(3) rural area, suburb, wireless signal generally can be through the refraction or the reflection in trees and short house, and energy is generally obtained by the reflection footpath, because high building is less, the time domain ratio is less, translational speed is limited, generally can not surpass 120Km/h, therefore in this scene, can use MIMO, carry out the multithread transmission, improve power system capacity, therefore use many antenna emissions.
Referring to Fig. 4 A to Fig. 4 C, Fig. 4 A to Fig. 4 C is respectively single antenna, 2 antennas and the 4 antenna pilot structural representations of rural area, embodiment of the invention suburb scene.By Fig. 4 A to Fig. 4 C as seen, the pilot tone frequency domain is spaced apart 180KHz, and the pilot tone time domain interval is 0.5ms.Wherein, the situation of 2 antennas is main situations about considering, in general rural environment, can not guarantee to support 4 streams.The single antenna pilot-frequency expense is that 1.2%, 2 antenna pilot expense is 2.4%.
(4) abominable city, mountain area, wireless signal generally can be through distant mountain or the reflection of high building at a distance, the time domain expansion is big, translational speed is limited, generally can not surpass 120Km/h, therefore in this scene, the OFDM symbol should use long CP can avoid intersymbol interference, can use transmit diversity or MIMO to carry out the multithread transmission, improve power system capacity, therefore use many antenna emissions.
Referring to Fig. 5 A to Fig. 5 C, Fig. 5 A to Fig. 5 C is respectively single antenna, 2 antennas and the 4 antenna pilot structural representations of the abominable urban settings in embodiment of the invention mountain area.By Fig. 5 A to Fig. 5 C as seen, the pilot tone frequency domain is spaced apart 45KHz, and the pilot tone time domain interval is 0.5ms.Wherein, 2 arrangement of antennas are main situations about considering.The single antenna pilot-frequency expense is that 6.67%, 2 antenna expense is 13.3%.
(5) focus area, terminal generally remains static, or nomadic state, the user is in the rich reflector environment, and wireless signal generally can be through object reflection on every side, and channel relevancy is less, can use MIMO to carry out the multithread transmission, improve power system capacity, therefore use many antenna emissions; Area coverage is little, and the time delay expansion is little, and translational speed is limited, generally can not surpass 5Km/h.Therefore in this scene, the OFDM symbol can use shorter CP length can improve the availability of frequency spectrum.
Referring to Fig. 6 A to Fig. 6 C, Fig. 6 A to Fig. 6 C is respectively single antenna, 2 antennas and the 4 antenna pilot structural representations of embodiment of the invention hot zones scene.By Fig. 6 A to Fig. 6 C as seen, the pilot tone frequency domain is spaced apart 360KHz, and the pilot tone time domain interval is 1ms.Wherein, 4 antenna configurations are main situations about considering, have rich reflector in the focus area, and more footpath, space can be provided, and can obtain peak rate under this configuration.The single antenna pilot-frequency expense is that 0.3%, 2 antenna is that 0.6%, 4 antenna is 1.2%.
The pilot configuration parameter of corresponding scene optimization can be selected according to self place scene in the base station, and carries out the signal emission according to the pilot configuration parameter of scene optimization.Here, the pilot configuration parameter of base station selected scene optimization can also can be selected by the base station voluntarily by manually selecting.
Because subscriber equipment after receiving signal, need be known the pilot configuration parameter, just knows the frequency pilot sign position, can correctly carry out demodulation, therefore, the pilot configuration parameter notifying user equipment that the base station must be optimized the scene of selecting.Below introduce the mode of notice.Before this, be necessary at first down channel to be done simple the introduction: down channel can be divided into broadcast channel, down control channel and DSCH Downlink Shared Channel, wherein, broadcast channel sends to all subscriber equipmenies in this sub-district with the essential information of system, has comprised subscriber equipment and has inserted the sub-district, carries out most important system information in cell selecting and the reuse adoption process.Therefore, the base station can be by the pilot configuration parameter notifying user equipment of broadcast channel with scene optimization.
In addition, because subscriber equipment is before receiving broadcasting and do not know the pilot configuration parameter that base station selected scene is optimized, therefore, for the reliability that guarantees that broadcast channel receives, the pilot configuration of broadcast channel need have unified structure, such as, adopt the pilot configuration that LTE stipulates in the prior art, all like this subscriber equipmenies just can carry out the reception of broadcast channel according to unified pilot configuration, thereby obtain the information such as pilot configuration parameter that base station selected scene is optimized.The base station is on the running time-frequency resource except that broadcast channel, on descending control channel and DSCH Downlink Shared Channel, can adopt the pilot configuration parameter of scene optimization to carry out the signal emission, after subscriber equipment obtains the pilot configuration parameter of scene optimization, the running time-frequency resource beyond the broadcast channel is carried out channel estimating according to this parameter.
To sum up, sum up the embodiment of the invention and propose a kind of method of downlink transmission, referring to Fig. 7, Fig. 7 is the flow chart of embodiment of the invention downlink transmission method, and this method comprises:
Step 701: the pilot configuration parameter that scene is optimized is determined according to the place scene in the base station, the indication information notifying user equipment of the pilot configuration parameter of the scene of determining being optimized by broadcast channel; The signal emission is carried out according to the pilot configuration parameter of described scene optimization in the base station on the running time-frequency resource the running time-frequency resource shared except that broadcast channel;
Step 702: subscriber equipment obtains the pilot configuration parameter that described scene is optimized, and according to the pilot configuration parameter of described scene optimization the down channel except that broadcast channel is carried out channel estimating.
In the said method, the base station can send to subscriber equipment with the numbering of place, base station scene, and subscriber equipment obtains the pilot configuration parameter that scene is optimized according to the corresponding relation of the pilot configuration parameter of scene numbering of preserving in advance and scene optimization.Specifically comprise:
In the step 701, the base station can comprise by the step of broadcast channel with the indication information notifying user equipment of the pilot configuration parameter of the scene optimization determined: the numbering of place, base station scene is sent to subscriber equipment in the sub-district, place;
In the step 702, the step that subscriber equipment obtains the pilot configuration parameter of scene optimization can comprise: subscriber equipment carries out channel estimating to broadcast channel, obtains the numbering of place, described base station scene; According to the corresponding relation of the scene numbering of preserving in advance, obtain the pilot configuration parameter that scene is optimized with the pilot configuration parameter of scene optimization.
In addition, may further include before the said method: typical scene is determined in the base station, and described typical scene is: high-speed mobile environment scene, typical urban scene, rural area, suburb scene, the abominable urban settings in mountain area and hot zones scene; Determine the maximum multipath time delay of each scene and the highest translational speed in scene, according to the relation of pilot tone frequency domain interval that satisfies system requirements and maximum multipath time delay and the pilot tone time domain interval that satisfies system requirements and the relation of high translational speed, calculate the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in each scene; According to system parameter setting principle easily, adjust the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in each scene, determine the pilot tone frequency domain interval and the pilot tone time domain interval of each scene.
The step of determining the pilot configuration parameter of scene optimization specifically can comprise:
When place, base station scene is the high-speed mobile environment scene, determine that the pilot tone frequency domain is spaced apart 360KHz, the pilot tone time domain interval is the interval (i.e. 142 μ s) of 2 OFDM symbols or the interval (i.e. 213 μ s) of 3 OFDM symbols;
When place, base station scene is the typical urban scene, determine that the pilot tone frequency domain is spaced apart 90KHz, the pilot tone time domain interval is 0.5ms;
When place, base station scene is rural area, suburb scene, determine that the pilot tone frequency domain is spaced apart 180KHz, the pilot tone time domain interval is 0.5ms;
When place, base station scene is the abominable urban settings in mountain area, determine that the pilot tone frequency domain is spaced apart 45KHz, the pilot tone time domain interval is 0.5ms;
When place, base station scene is the hot zones scene, determine that the pilot tone frequency domain is spaced apart 360KHz, the pilot tone time domain interval is 1ms.
The embodiment of the invention also proposes a kind of system of downlink transfer, comprising:
The base station is used for determining the pilot configuration parameter that scene is optimized according to the place scene, the indication information notifying user equipment of the pilot configuration parameter of the scene of determining being optimized by broadcast channel; Also be used on the running time-frequency resource the running time-frequency resource shared, carrying out the signal emission according to the pilot configuration parameter of described scene optimization except that broadcast channel;
Subscriber equipment is used to obtain the pilot configuration parameter that described scene is optimized, and according to the pilot configuration parameter of described scene optimization the down channel except that broadcast channel is carried out channel estimating.
The embodiment of the invention also proposes a kind of base station, comprising:
Determination module is used for determining the pilot configuration parameter that scene is optimized according to place, base station scene;
Notification module is used for the indication information notifying user equipment of the pilot configuration parameter the scene determined optimized by broadcast channel;
Transmitter module is used for carrying out the signal emission according to the pilot configuration parameter of described scene optimization on the running time-frequency resource the running time-frequency resource shared except that broadcast channel.
In the above-mentioned base station, notification module can be used for, and the numbering of place, base station scene is sent to subscriber equipment in the sub-district, place, base station.
In the above-mentioned base station, select module specifically can comprise:
Calculating sub module is used for determining typical scene, and described typical scene is: high-speed mobile environment scene, typical urban scene, rural area, suburb scene, the abominable urban settings in mountain area or hot zones scene; Determine the maximum multipath time delay of each scene and the highest translational speed in scene, according to the relation of pilot tone frequency domain interval that satisfies system requirements and maximum multipath time delay and the pilot tone time domain interval that satisfies system requirements and the relation of high translational speed, calculate the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in each scene;
Adjust submodule, be used for adjusting the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in above-mentioned each scene, determine the pilot tone frequency domain interval and the pilot tone time domain interval of each scene according to system parameter setting principle easily.
In the above-mentioned base station, determination module specifically can be used for:
When place, base station scene is the high-speed mobile environment scene, determine that the pilot tone frequency domain is spaced apart 360KHz, the pilot tone time domain interval is the interval (i.e. 142 μ s) of 2 OFDM symbols or the interval (i.e. 213 μ s) of 3 OFDM symbols;
When place, base station scene is the typical urban scene, determine that the pilot tone frequency domain is spaced apart 90KHz, the pilot tone time domain interval is 0.5ms;
When place, base station scene is rural area, suburb scene, determine that the pilot tone frequency domain is spaced apart 180KHz, the pilot tone time domain interval is 0.5ms;
When place, base station scene is the abominable urban settings in mountain area, determine that the pilot tone frequency domain is spaced apart 45KHz, the pilot tone time domain interval is 0.5ms;
When place, base station scene is the hot zones scene, select the pilot tone frequency domain to be spaced apart 360KHz, the pilot tone time domain interval is 1ms.
The embodiment of the invention also proposes a kind of subscriber equipment, comprising: acquisition module is used to obtain the pilot configuration parameter that the determined scene in base station is optimized;
Channel estimation module is used for according to the pilot configuration parameter of scene optimization the running time-frequency resource except that broadcast channel being carried out channel estimating.
Acquisition module in the above-mentioned subscriber equipment specifically can be used for: broadcast channel is carried out channel estimating, obtain the numbering of place, base station scene; According to the corresponding relation of the scene numbering of preserving in advance, obtain the pilot configuration parameter that the determined scene in base station is optimized with the pilot configuration parameter of scene optimization.
As fully visible, the method and system that the present invention proposes, optimize the pilot configuration parameter at the different scene of different scene designs, the pilot configuration parameter that the base station selects corresponding scene to optimize according to the place scene, and with this parameter by the broadcast channel notifying user equipment, on the running time-frequency resource the running time-frequency resource shared, carry out signal and launch according to the pilot configuration parameter of the scene optimization of selection except that broadcast channel; After subscriber equipment receives the pilot configuration parameter of scene optimization, adjust channel estimation methods, the down channel except that broadcast channel is carried out channel estimating according to the pilot configuration parameter of scene optimization.Scene optimization pilot configuration parameter designs at different scenes among the present invention, under the prerequisite that guarantees the channel estimating quality, can reduce pilot-frequency expense, improves the availability of frequency spectrum of system.
Claims (11)
1, a kind of method of downlink transmission is characterized in that, described method comprises:
The pilot configuration parameter that scene is optimized is determined according to the place scene in the base station, the indication information notifying user equipment of the pilot configuration parameter of the scene of determining being optimized by broadcast channel; The signal emission is carried out according to the pilot configuration parameter of described scene optimization in the base station on the running time-frequency resource the running time-frequency resource shared except that broadcast channel;
Subscriber equipment obtains the pilot configuration parameter that described scene is optimized, and according to the pilot configuration parameter of described scene optimization the down channel except that broadcast channel is carried out channel estimating.
2, method according to claim 1, it is characterized in that described base station comprises by the step of broadcast channel with the indication information notifying user equipment of the pilot configuration parameter of the scene optimization determined: the numbering of place, base station scene is sent to subscriber equipment in the sub-district, place;
The step that described subscriber equipment obtains the pilot configuration parameter of scene optimization comprises: subscriber equipment carries out channel estimating to broadcast channel, obtains the numbering of place, described base station scene; According to the corresponding relation of the scene numbering of preserving in advance, obtain the pilot configuration parameter that scene is optimized with the pilot configuration parameter of scene optimization.
3, method according to claim 1 is characterized in that, further comprises before the described method:
Typical scene is determined in the base station, and described typical scene is: high-speed mobile environment scene, typical urban scene, rural area, suburb scene, the abominable urban settings in mountain area or hot zones scene; Determine the maximum multipath time delay of each scene and the highest translational speed in scene, according to the relation of pilot tone frequency domain interval that satisfies system requirements and maximum multipath time delay and the pilot tone time domain interval that satisfies system requirements and the relation of high translational speed, calculate the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in each scene; According to system parameter setting principle easily, adjust the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in each scene, determine the pilot tone frequency domain interval and the pilot tone time domain interval of each scene.
According to claim 1 or 3 described methods, it is characterized in that 4, described base station determines that according to the place scene step of the pilot configuration parameter of scene optimization comprises:
When place, base station scene is the high-speed mobile environment scene, determine that the pilot tone frequency domain is spaced apart 360 KHz, the pilot tone time domain interval is the interval of 2 OFDM symbols or the interval of 3 OFDM symbols;
When place, base station scene is the typical urban scene, determine that the pilot tone frequency domain is spaced apart 90 KHz, the pilot tone time domain interval is 0.5 millisecond;
When place, base station scene is rural area, suburb scene, determine that the pilot tone frequency domain is spaced apart 180 KHz, the pilot tone time domain interval is 0.5 millisecond;
When place, base station scene is the abominable urban settings in mountain area, determine that the pilot tone frequency domain is spaced apart 45 KHz, the pilot tone time domain interval is 0.5 millisecond;
When place, base station scene is the hot zones scene, determine that the pilot tone frequency domain is spaced apart 360 KHz, the pilot tone time domain interval is 1 millisecond.
5, a kind of system of downlink transfer is characterized in that, described system comprises:
The base station is used for determining the pilot configuration parameter that scene is optimized according to the place scene, the indication information notifying user equipment of the pilot configuration parameter of the scene of determining being optimized by broadcast channel; Also be used on the running time-frequency resource the running time-frequency resource shared, carrying out the signal emission according to the pilot configuration parameter of described scene optimization except that broadcast channel;
Subscriber equipment is used to obtain the pilot configuration parameter that described scene is optimized, and according to the pilot configuration parameter of described scene optimization the down channel except that broadcast channel is carried out channel estimating.
6, a kind of base station is characterized in that, described base station comprises:
Determination module is used for determining the pilot configuration parameter that scene is optimized according to place, base station scene;
Notification module is used for the indication information notifying user equipment of the pilot configuration parameter the scene determined optimized by broadcast channel;
Transmitter module is used for carrying out the signal emission according to the pilot configuration parameter of described scene optimization on the running time-frequency resource the running time-frequency resource shared except that broadcast channel.
7, base station according to claim 6 is characterized in that, described notification module is used for numbering with place, base station scene and sends to subscriber equipment in the sub-district, place, base station.
8, base station according to claim 6 is characterized in that, described determination module comprises:
Calculating sub module is used for determining typical scene, and described typical scene is: high-speed mobile environment scene, typical urban scene, rural area, suburb scene, the abominable urban settings in mountain area or hot zones scene; Determine the maximum multipath time delay of each scene and the highest translational speed in scene, according to the relation of pilot tone frequency domain interval that satisfies system requirements and maximum multipath time delay and the pilot tone time domain interval that satisfies system requirements and the relation of high translational speed, calculate the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in each scene;
Adjust submodule, be used for adjusting the pilot tone frequency domain interval and the pilot tone time domain interval that satisfy system requirements in above-mentioned each scene, determine the pilot tone frequency domain interval and the pilot tone time domain interval of each scene according to system parameter setting principle easily.
9, according to claim 6 or 8 described base stations, it is characterized in that described determination module is used for,
When place, base station scene is the high-speed mobile environment scene, determine that the pilot tone frequency domain is spaced apart 360 KHz, the pilot tone time domain interval is the interval of 2 OFDM symbols or the interval of 3 OFDM symbols;
When place, base station scene is the typical urban scene, determine that the pilot tone frequency domain is spaced apart 90 KHz, the pilot tone time domain interval is 0.5 millisecond;
When place, base station scene is rural area, suburb scene, determine that the pilot tone frequency domain is spaced apart 180 KHz, the pilot tone time domain interval is 0.5 millisecond;
When place, base station scene is the abominable urban settings in mountain area, determine that the pilot tone frequency domain is spaced apart 45 KHz, the pilot tone time domain interval is 0.5 millisecond;
When place, base station scene is the hot zones scene, determine that the pilot tone frequency domain is spaced apart 360 KHz, the pilot tone time domain interval is 1 millisecond.
10, a kind of subscriber equipment is characterized in that, described subscriber equipment comprises:
Acquisition module is used to obtain the pilot configuration parameter that the determined scene in base station is optimized;
Channel estimation module is used for according to the pilot configuration parameter of scene optimization the running time-frequency resource except that broadcast channel being carried out channel estimating.
11, subscriber equipment according to claim 10 is characterized in that, described acquisition module is used for broadcast channel is carried out channel estimating, obtains the numbering of place, base station scene; According to the corresponding relation of the scene numbering of preserving in advance, obtain the pilot configuration parameter that the determined scene in base station is optimized with the pilot configuration parameter of scene optimization.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101130651A CN101594661A (en) | 2008-05-27 | 2008-05-27 | A kind of method of downlink transmission, system, base station and subscriber equipment |
| PCT/CN2009/072026 WO2009143779A1 (en) | 2008-05-27 | 2009-05-27 | A method, system, base station and user equipment for downlink transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101130651A CN101594661A (en) | 2008-05-27 | 2008-05-27 | A kind of method of downlink transmission, system, base station and subscriber equipment |
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| CN101594661A true CN101594661A (en) | 2009-12-02 |
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| CNA2008101130651A Pending CN101594661A (en) | 2008-05-27 | 2008-05-27 | A kind of method of downlink transmission, system, base station and subscriber equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101594661A (en) |
| WO (1) | WO2009143779A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437872A (en) * | 2011-08-09 | 2012-05-02 | 上海通号轨道交通工程技术研究中心有限公司 | Device for constructing multi-path transmission condition between railway base station and train |
| CN102938669A (en) * | 2012-11-20 | 2013-02-20 | 杭州电子科技大学 | Method for suppressing Doppler spread in high-speed mobile environment |
| CN103916227A (en) * | 2013-01-09 | 2014-07-09 | 工业和信息化部电信传输研究所 | Method for sending public pilot frequency and base station |
| WO2015018077A1 (en) * | 2013-08-09 | 2015-02-12 | Telefonaktiebolaget L M Ericsson (Publ) | Bs and ue, and interference cancellation methods used in the same |
| CN107431593A (en) * | 2015-03-13 | 2017-12-01 | 高通股份有限公司 | System and method for the mobility tracking to subscriber's installation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075844B (en) * | 2006-05-17 | 2010-07-21 | 大唐移动通信设备有限公司 | Method for expanding time-division synchronous CDMA access system coverage |
| CN101087469B (en) * | 2006-06-09 | 2010-06-23 | 大唐移动通信设备有限公司 | A method for realizing random access of user device |
-
2008
- 2008-05-27 CN CNA2008101130651A patent/CN101594661A/en active Pending
-
2009
- 2009-05-27 WO PCT/CN2009/072026 patent/WO2009143779A1/en active Application Filing
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437872A (en) * | 2011-08-09 | 2012-05-02 | 上海通号轨道交通工程技术研究中心有限公司 | Device for constructing multi-path transmission condition between railway base station and train |
| CN102938669A (en) * | 2012-11-20 | 2013-02-20 | 杭州电子科技大学 | Method for suppressing Doppler spread in high-speed mobile environment |
| CN103916227A (en) * | 2013-01-09 | 2014-07-09 | 工业和信息化部电信传输研究所 | Method for sending public pilot frequency and base station |
| WO2015018077A1 (en) * | 2013-08-09 | 2015-02-12 | Telefonaktiebolaget L M Ericsson (Publ) | Bs and ue, and interference cancellation methods used in the same |
| CN105453655A (en) * | 2013-08-09 | 2016-03-30 | 瑞典爱立信有限公司 | BS and UE, and interference cancellation methods used in the same |
| US10123337B2 (en) | 2013-08-09 | 2018-11-06 | Telefonaktiebolaget Lm Ericsson (Publ) | BS and UE, and interference cancellation methods used in the same |
| CN105453655B (en) * | 2013-08-09 | 2019-01-11 | 瑞典爱立信有限公司 | BS and UE and interference elimination method used in it |
| US10575313B2 (en) | 2013-08-09 | 2020-02-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Interference cancellation methods used in base stations and user equipments |
| US11324012B2 (en) | 2013-08-09 | 2022-05-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Interference Cancellation methods used in Base Stations and User Equipments |
| CN107431593A (en) * | 2015-03-13 | 2017-12-01 | 高通股份有限公司 | System and method for the mobility tracking to subscriber's installation |
| CN107431593B (en) * | 2015-03-13 | 2020-12-18 | 高通股份有限公司 | System and method for mobility tracking of user equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009143779A1 (en) | 2009-12-03 |
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