CN101383656A - Method and device for optimizing pilot based on speed and channel quality indication - Google Patents
Method and device for optimizing pilot based on speed and channel quality indication Download PDFInfo
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Abstract
The invention discloses a method and a device of optimizing the pilot frequency based on the speed and channel quality indication, which are applied to an orthogonal frequency division multiplexing system. The system bandwidth is divided into a plurality of continuous frequency bands according to the density of the pilot frequency from the large to the small, speed intervals corresponding to the frequency bands are distributed from high to low; a base station or a radio relay station measures the velocity of movement of a movable terminal, allocated physical resource of the movable terminal exists in the frequency band corresponding to the velocity of movement in the speed interval. The method and the device for optimizing the pilot frequency are adopted to divide the bandwidth into the frequency bands, the pilot frequency density on the time direction is adjusted according to the speed of UE, each frequency band can be regarded as the physical resource allocation under the new system bandwidth, the allocation principle can be performed according to the channel quality indication CQI, compared with the prior art, the invention saves the cost of the pilot frequency.
Description
Technical field
The present invention relates to field of wireless communication, especially relate to a kind of at OFDM (OrthogonalFrequency Division Multiplexing, OFDM) in the system, method and device based on the optimization pilot tone of speed and CQI (Channel Quality Indicator, channel quality indication).
Background technology
To the having relatively high expectations of transmission rate, receiving terminal need carry out coherent detection and could obtain systematic function preferably simultaneously based on the wireless communication system of OFDM.Therefore, in the research to ofdm system, more lay particular emphasis on the channel estimation method of employing based on pilot tone at present, it can follow the tracks of the variation of channel well, promotes the performance of receiver.In the channel estimation technique research based on pilot tone, except the pilot channel estimation algorithm performance, the transmitting terminal pilot design directly affects systematic function to a great extent.
In multicarrier system, adopt channel estimation method to require transmitting terminal before sending data, at first will determine the pilot tone pattern that inserts based on pilot tone.The design of pilot tone pattern is inserted and is finished at transmitting terminal, and when receiving terminal carried out channel estimating, the channel information that obtains on the taking-up pilot frequency locations was realized the estimation to whole channel.Can recover the characteristic of channel to greatest extent from the channel sample data that these pilot tone points obtain, depend on the performance of selected algorithm for estimating on the one hand, whether the another one key factor is exactly the set pilot frequency locations of transmitting terminal representative, and whether entrained channel information is enough to accurately reflect the characteristic of whole channel.Therefore, being provided with of pilot tone pattern all has a significant impact accuracy of channel estimation and even whole system performance.In the research that pilot tone is provided with,, also to determine the placement location and the number of pilot tone according to concrete channel circumstance except needs are followed basic being provided with the criterion.In a word, to the research of pilot tone pattern set-up mode, between the validity of system and reliability, find best balance point exactly.
In order to satisfy the communication requirement of different motion speed mobile terminal UE simultaneously, existing wireless communication systems often all is that the expense of pilot sub-carrier will be very big like this according to the pilot tone of prestissimo and maximum delay design when the design pilot tone.UE might not be in high-speed motion when communication, thus just waste very much to a certain extent according to the pilot tone of maximal rate design, because on time orientation, just be enough to the track channel change rule than this pilot tone still less.
Chinese patent CN200510109566.9 discloses the method and apparatus of optimizing pilot tone in a kind of cellular communication system, speed according to UE, optimize pilot design by the pilot density that is adjusted on the time orientation, but the distribution to physical resource in this patent is not optimized, and all adopts a distribution method for the whole bandwidth of system.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and device of the optimization pilot tone based on the indication of speed and channel quality, with the expense of reasonable distribution pilot sub-carrier.
In order to address the above problem, the invention provides a kind of method of the optimization pilot tone based on the indication of speed and channel quality, be applied to ofdm system, system bandwidth is divided into pilot density a plurality of continuous frequency range from big to small, the speed interval of these frequency range correspondences also from high to low; Base station or radio repeater station are measured the movement velocity of portable terminal, distribute physical resource for this portable terminal in the frequency range of this movement velocity place speed interval correspondence.
Further, above-mentioned method also can have following characteristics:
Described base station or radio repeater station are designated as its distribution physical resource according to the channel quality of described portable terminal feedback.
Further, above-mentioned method also can have following characteristics:
Described base station or radio repeater station are divided into basic, normal, high three frequency ranges by the pilot interval on the time direction is ascending with system bandwidth.
Further, above-mentioned method also can have following characteristics:
The speed interval of described low-frequency range correspondence is for being lower than 30km/h, and the speed interval of described Mid Frequency correspondence is 30km/h～120km/h, and the speed interval of described high band correspondence is for being higher than 120km/h.
Further, above-mentioned method also can have following characteristics:
Described base station end is periodically measured the movement velocity of described portable terminal, judges the speed interval at place according to measured current movement velocity, and with the frequency range of this speed interval correspondence as the frequency range of next time for this portable terminal distribution.
The present invention also provides a kind of device of the optimization pilot tone based on the indication of speed and channel quality, be used for ofdm system, comprise pilot frequency configuration module, speed measurement module, resource distribution module and the frequency allocation module that links to each other with above-mentioned module respectively, wherein:
Described pilot frequency configuration module is used for system bandwidth is divided into pilot density a plurality of continuous frequency range from big to small, and the speed interval of these frequency range correspondences also from high to low;
Described speed measurement module is used to measure the movement velocity of portable terminal, and described movement velocity is sent to described frequency allocation module;
Described frequency allocation module, the speed interval that is used for according to the described movement velocity that receives and each frequency range correspondence is that described portable terminal distributes corresponding frequency range, and sends to resource distribution module;
Described resource distribution module, being used for is being to be that this portable terminal distributes physical resource in the frequency range that described portable terminal distributed.
Further, above-mentioned device also can have following characteristics:
Described resource distribution module receives the channel quality indication from described portable terminal feedback, is designated as it according to the described channel quality that receives and distributes physical resource.
Further, above-mentioned device also can have following characteristics:
Described pilot frequency configuration module is divided into basic, normal, high three frequency ranges by the pilot interval on the time direction is ascending with system bandwidth.
Further, above-mentioned device also can have following characteristics:
The speed interval of described low-frequency range correspondence is for being lower than 30km/h, and the speed interval of described Mid Frequency correspondence is 30km/h～120km/h, and the speed interval of described high band correspondence is for being higher than 120km/h.
Further, above-mentioned device also can have following characteristics:
Described speed measurement module is periodically measured the movement velocity of described portable terminal, judges the speed interval at place according to measured current movement velocity, and with the frequency range of this speed interval correspondence as the frequency range of next time for this portable terminal distribution.
Adopt the method and the device of optimization pilot tone of the present invention, whole bandwidth is divided into a plurality of frequency ranges, be adjusted at pilot density on the time orientation according to the speed of UE, each frequency range can be regarded the physical source distributing under new system bandwidth as, distribution principle is carried out according to CQI, these 3 frequency ranges can be considered as separate, physical source distributing can be carried out for each frequency range according to dispatching algorithms such as max carrier to interference, equitable proportion, polls in the base station, compared with prior art, saved the pilot-frequency expense problem.
Description of drawings
Fig. 1 is the schematic block diagram of the optimization pilot tone device of the embodiment of the invention;
Fig. 2 is the pilot tone schematic diagram of the embodiment of the invention.
Embodiment
The present invention proposes the optimization pilot frequency system based on speed and channel quality indication, the core content of its technical scheme comprises: system bandwidth is divided into a plurality of frequency ranges, movement velocity according to portable terminal is distributed frequency range for it, and is designated as its distribution physical resource according to the channel quality of described portable terminal feedback.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
As shown in Figure 1, be example with the IMT-Advanced communication system, the optimization pilot tone device in base station or the wireless repeater comprises pilot frequency configuration module 1, speed measurement module 2, resource distribution module 4 and the frequency allocation module 3 that links to each other with these modules respectively, wherein:
Pilot frequency configuration module 1 is used for system bandwidth is divided into pilot density a plurality of continuous frequency range from big to small, and the speed interval of these frequency range correspondences also from high to low;
The speed interval that frequency allocation module 3 is used for according to the described movement velocity that receives and each frequency range correspondence is that described portable terminal distributes corresponding frequency range, and sends to resource distribution module 4;
It is being to be that this portable terminal distributes physical resource in the frequency range that described portable terminal distributed that resource distribution module 4 is used for.
The present embodiment method at first needs the whole bandwidth of system is divided, and present embodiment is by the ascending order of the pilot interval on the time direction bandwidth to be divided into basic, normal, high three frequency ranges, and each frequency range is corresponding to a speed interval.The frequency range that also the whole bandwidth of system can be divided in other embodiments, 2 or 4 or other number.
The process (also can regard the process as the UE Resources allocation as) that present embodiment is optimized pilot tone mainly comprises the steps:
The first step: base station or radio repeater station are measured the movement velocity of UE;
Movement velocity can oneself be measured by base station measurement or by the UE end, if the UE end is measured, then feeds back to the base station end; If the base station end is measured, then need not feed back.
Second step: base station or radio repeater station are judged the speed interval of the movement velocity of UE in which frequency range correspondence, with the frequency range of this frequency range as sub-distribution under this UE, be a TTI (Transmission Time Interval, Transmission Time Interval) each measuring period;
As be in the UE of high-speed motion for some, the base station is assigned to low-frequency range to it automatically, middle low-speed motion also do corresponding processing, for example, when the movement velocity of UE is lower than 30km/h, UE is distributed in high band; When the movement velocity of UE is between 30km/h～120km/h, UE is distributed in Mid Frequency; During greater than 120km/h, then UE is distributed in low-frequency range in the movement velocity of UE.
The 3rd step: base station or wireless relay stand in and carry out PRB (Physical Resource Block) mapping in the frequency range of distributing, at this moment can be regarded as the physical source distributing under new system bandwidth, distribution principle is carried out according to CQI, behind all UE distribution physical resources, finishes.
After distributing physical resource, carry out again just can launching the physical resource that is distributed after the follow-up IFFT processing such as (inverse Fourier transforms).In this step, MCS (Modulation and Coding Scheme, Modulation and Coding Scheme) can also be adjusted according to the CQI of UE feedback in the base station, and the MCS selection of this moment keeps the same with the selection principle under the conventional pilot tone.
In IMT-Advanced communication system or other ofdm system, owing to there is big bandwidth situation,,, the present invention is adjusted at pilot density on the time orientation although being speed according to UE as 100MHz, whole 100MHz bandwidth is divided into 3 frequency ranges.Because at the UE of high band is in order to pursue higher traffic rate, so generally all be in low-speed motion state or inactive state at the UE of this frequency range, so, the present invention goes up pilot density conversion to some extent the time, key is that we are divided into high, normal, basic 3 different frequency ranges to whole bandwidth, and disclosed Chinese patent CN200510109566.9 does not relate to the thought of frequency range.
Whole bandwidth is being divided on the basis of how different frequency ranges, each frequency range can be regarded this physical source distributing under new system bandwidth as, distribution principle is carried out according to CQI, these 3 frequency ranges can be considered as separate, physical source distributing can be carried out for each frequency range according to dispatching algorithms (these dispatching algorithms all have relation with CQI) such as max carrier to interference, equitable proportion, polls in the base station, and patent CN200510109566.9 is a distribution method for whole bandwidth.
In addition, in order to utilize the present invention to optimize pilot-frequency expense on the basis of communication requirement better satisfying, bandwidth can also be divided into low, high two frequency ranges, perhaps be divided into low, lower, in, higher, high five frequency ranges, perhaps other are more, and its pilot design principle is same as the previously described embodiments.
In sum, adopt the method and the device of optimization pilot tone of the present invention, compared with prior art, saved the pilot-frequency expense problem.
Certainly; embodiment provided by the invention is just in order at large to illustrate the method for optimization pilot tone provided by the invention; thereby all be exemplary execution mode explanation; it can not be regarded as for restriction of the present invention; and every conspicuous modification within aim of the present invention is also due within protection scope of the present invention.
Claims (10)
1, a kind of method of the optimization pilot tone based on the indication of speed and channel quality is applied to ofdm system, it is characterized in that,
System bandwidth is divided into pilot density a plurality of continuous frequency range from big to small, and the speed interval of these frequency range correspondences also from high to low;
Base station or radio repeater station are measured the movement velocity of portable terminal, distribute physical resource for this portable terminal in the frequency range of this movement velocity place speed interval correspondence.
2, the method for claim 1 is characterized in that,
Described base station or radio repeater station are designated as its distribution physical resource according to the channel quality of described portable terminal feedback.
3, the method for claim 1 is characterized in that,
Described base station or radio repeater station are divided into basic, normal, high three frequency ranges by the pilot interval on the time direction is ascending with system bandwidth.
4, method as claimed in claim 3 is characterized in that,
The speed interval of described low-frequency range correspondence is for being lower than 30km/h, and the speed interval of described Mid Frequency correspondence is 30km/h～120km/h, and the speed interval of described high band correspondence is for being higher than 120km/h.
5, as the arbitrary described method of claim 1 to 4, it is characterized in that,
Described base station end is periodically measured the movement velocity of described portable terminal, judges the speed interval at place according to measured current movement velocity, and with the frequency range of this speed interval correspondence as the frequency range of next time for this portable terminal distribution.
6, a kind of device of the optimization pilot tone based on the indication of speed and channel quality, be used for ofdm system, it is characterized in that, comprise pilot frequency configuration module, speed measurement module, resource distribution module and the frequency allocation module that links to each other with above-mentioned module respectively, wherein:
Described pilot frequency configuration module is used for system bandwidth is divided into pilot density a plurality of continuous frequency range from big to small, and the speed interval of these frequency range correspondences also from high to low;
Described speed measurement module is used to measure the movement velocity of portable terminal, and described movement velocity is sent to described frequency allocation module;
Described frequency allocation module, the speed interval that is used for according to the described movement velocity that receives and each frequency range correspondence is that described portable terminal distributes corresponding frequency range, and sends to resource distribution module;
Described resource distribution module, being used for is being to be that this portable terminal distributes physical resource in the frequency range that described portable terminal distributed.
7, device as claimed in claim 6 is characterized in that,
Described resource distribution module receives the channel quality indication from described portable terminal feedback, is designated as it according to the described channel quality that receives and distributes physical resource.
8, device as claimed in claim 6 is characterized in that,
Described pilot frequency configuration module is divided into basic, normal, high three frequency ranges by the pilot interval on the time direction is ascending with system bandwidth.
9, device as claimed in claim 8 is characterized in that,
The speed interval of described low-frequency range correspondence is for being lower than 30km/h, and the speed interval of described Mid Frequency correspondence is 30km/h～120km/h, and the speed interval of described high band correspondence is for being higher than 120km/h.
10, as the arbitrary described device of claim 6 to 9, it is characterized in that,
Described speed measurement module is periodically measured the movement velocity of described portable terminal, judges the speed interval at place according to measured current movement velocity, and with the frequency range of this speed interval correspondence as the frequency range of next time for this portable terminal distribution.
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| CNA2007101480646A CN101383656A (en) | 2007-09-05 | 2007-09-05 | Method and device for optimizing pilot based on speed and channel quality indication |
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| CNA2007101480646A CN101383656A (en) | 2007-09-05 | 2007-09-05 | Method and device for optimizing pilot based on speed and channel quality indication |
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| CN102076097A (en) * | 2009-11-25 | 2011-05-25 | 华为技术有限公司 | Resource scheduling method and base station |
| CN102905371A (en) * | 2011-07-27 | 2013-01-30 | 普天信息技术研究院有限公司 | Method for quick allocation of frequency domain resources |
| CN102064929B (en) * | 2009-11-16 | 2013-09-25 | 电信科学技术研究院 | Method, device and system for transmitting pilot of backhaul link |
| CN103491636A (en) * | 2013-10-12 | 2014-01-01 | 中国联合网络通信集团有限公司 | User service rate based quality allocation method and device |
| CN103685088A (en) * | 2012-09-20 | 2014-03-26 | 华为技术有限公司 | Pilot frequency optimization method of sparse channel, device and channel estimation method |
| CN103974270A (en) * | 2014-05-22 | 2014-08-06 | 北京理工大学 | Capacity enhancing method for multi-user Massive MIMO wireless mobile communication system |
| WO2015168940A1 (en) * | 2014-05-09 | 2015-11-12 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| CN109314680A (en) * | 2018-08-20 | 2019-02-05 | 北京小米移动软件有限公司 | Channel estimation methods, device, equipment, base station and storage medium |
| CN114337968A (en) * | 2021-12-28 | 2022-04-12 | 湖南智领通信科技有限公司 | Active pilot frequency adjusting method and device based on real-time measurement and control data |
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| CN102064929B (en) * | 2009-11-16 | 2013-09-25 | 电信科学技术研究院 | Method, device and system for transmitting pilot of backhaul link |
| CN102076097B (en) * | 2009-11-25 | 2014-03-05 | 华为技术有限公司 | Resource scheduling method and base station |
| CN102076097A (en) * | 2009-11-25 | 2011-05-25 | 华为技术有限公司 | Resource scheduling method and base station |
| CN102905371B (en) * | 2011-07-27 | 2015-07-29 | 普天信息技术研究院有限公司 | A kind of method of fast allocation frequency domain resource |
| CN102905371A (en) * | 2011-07-27 | 2013-01-30 | 普天信息技术研究院有限公司 | Method for quick allocation of frequency domain resources |
| CN103685088B (en) * | 2012-09-20 | 2017-06-06 | 华为技术有限公司 | The pilot frequency optimization method of condition of sparse channel, device and channel estimation methods |
| CN103685088A (en) * | 2012-09-20 | 2014-03-26 | 华为技术有限公司 | Pilot frequency optimization method of sparse channel, device and channel estimation method |
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| CN103491636B (en) * | 2013-10-12 | 2016-07-06 | 中国联合网络通信集团有限公司 | A kind of quality allocation method based on customer service speed and device |
| CN103491636A (en) * | 2013-10-12 | 2014-01-01 | 中国联合网络通信集团有限公司 | User service rate based quality allocation method and device |
| WO2015168940A1 (en) * | 2014-05-09 | 2015-11-12 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| CN106233766A (en) * | 2014-05-09 | 2016-12-14 | 华为技术有限公司 | Demodulated reference signal collocation method, device, base station and subscriber equipment |
| CN110401520A (en) * | 2014-05-09 | 2019-11-01 | 华为技术有限公司 | Demodulated reference signal configuration method, device, base station and user equipment |
| CN110460417A (en) * | 2014-05-09 | 2019-11-15 | 华为技术有限公司 | Demodulated reference signal configuration method, device, base station and user equipment |
| CN110401520B (en) * | 2014-05-09 | 2020-10-16 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| CN110460417B (en) * | 2014-05-09 | 2020-10-27 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| CN103974270A (en) * | 2014-05-22 | 2014-08-06 | 北京理工大学 | Capacity enhancing method for multi-user Massive MIMO wireless mobile communication system |
| CN109314680A (en) * | 2018-08-20 | 2019-02-05 | 北京小米移动软件有限公司 | Channel estimation methods, device, equipment, base station and storage medium |
| CN109314680B (en) * | 2018-08-20 | 2021-10-15 | 北京小米移动软件有限公司 | Channel estimation method, device, equipment, base station and storage medium |
| CN114337968A (en) * | 2021-12-28 | 2022-04-12 | 湖南智领通信科技有限公司 | Active pilot frequency adjusting method and device based on real-time measurement and control data |
| CN114337968B (en) * | 2021-12-28 | 2023-06-06 | 湖南智领通信科技有限公司 | Active pilot frequency adjusting method and device based on real-time measurement and control data |
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Application publication date: 20090311 |