CN102271352A - Method for transmitting downlink data between relay node and UE - Google Patents
Method for transmitting downlink data between relay node and UE Download PDFInfo
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Abstract
The invention provides a method for transmitting downlink data between a relay node and UE (User Equipment). The method comprises steps: for the UE within the coverage of any RN (Relay Node), an eNodeB directly notifies the RN and the UE, and the UE sends time frequency resources and parameters of an SRS (Surveillance Reference Signal); the UE sends the SRS according to the notification sent by the eNodeB; the RN receives the SRS according to the notification sent by the eNodeB and obtains wireless channel features between the UE and the RN according to the SRS; and according to the wireless channel features, the RN performs beam-forming, time frequency synchronous fine adjustment and power control on the downlink signals sent to the UE. By the application of the method, the RN performs the beam-forming on a downlink forwarding service channel self-adaptively according to the detection on the SRS without adding uplink and downlink signallings so that the downlink data transmission performance is improved greatly, the data receptivity of the UE and the wireless system performance are improved, and the wireless interference around the RN coverage is reduced.
Description
Technical Field
The present invention relates to a relay technology in a communication system, and in particular, to a downlink data transmission method between a relay node and a UE.
Background
The Relay Node (RN) is an intermediate node between the base station and the terminal, and increases system coverage, system capacity, and user experience by receiving and enhancing transmission of uplink and downlink signals. The RN and the eNodeB wirelessly communicate through a Un port, and the RN and the UE wirelessly communicate through a Uu port, as shown in FIG. 1.
The RN can flexibly increase the coverage of blind spots, indoor coverage, new area coverage extension and high-speed data coverage in an enhanced area, and can also realize rapid temporary network deployment and effectively support the communication requirements of a mobile group, such as communication of passengers on trains, buses and ships. Relay technology is an active addition to wireless networks.
Two major types of RNs, Type1 and Type2, are generally defined depending on whether the RN is transparent to the terminal, i.e., whether the UE needs to know the existence of a relay node. Where Type1 RN is non-transparent and Type2 is transparent. The Type2 RN is mainly characterized in that the UE directly interacts with the base station to control signaling, and service data between the UE and the base station is forwarded through the RN. Although there is signaling interaction between the RN and the base station, it is transparent to the terminal. A schematic diagram of the uplink and the downlink of the Type2 RN is shown in FIG. 2.
The application of the Type2 RN can improve the network performance on one hand, and the terminal does not need to add any function on the other hand.
However, since the UE in the RN coverage transmits its traffic data through the Uu interface between the UE and the RN, the following problems may occur: a large amount of data is transmitted through a wireless channel between the UE and the RN, but the corresponding channel estimation is lacked, so that the transmission performance of the wireless channel between the UE and the RN is reduced; meanwhile, due to the introduction of the RN, a wireless emission source is increased and the complexity of the wireless environment is increased due to the original pure uplink and downlink wireless environment of the UE-eNB.
Disclosure of Invention
The invention provides a downlink data transmission method between a relay node and UE (user equipment), which can improve the data transmission performance from RN (relay node) to UE.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for transmitting downlink data between a relay node and a UE comprises the following steps:
for UE in the coverage range of any relay node RN, an eNodeB directly informs the RN and the UE, and the UE sends time-frequency resources and parameters of an SRS (sounding reference signal);
the UE sends an SRS according to a notification issued by an eNodeB, the RN receives the SRS according to the notification issued by the eNodeB, and acquires the wireless channel characteristic between the UE and the RN according to the SRS;
and the RN carries out beam forming, time-frequency synchronization fine tuning and power control on the downlink signal sent to the UE according to the wireless channel characteristics.
Preferably, the eNodeB directly notifying the RN of the time-frequency resource and the parameter of the SRS sent by the UE includes:
the eNodeB periodically transmits the time-frequency resources and the parameters of the SRS to the RN, and all the UEs in the coverage area of the eNodeB transmit the time-frequency resources and the parameters of the SRS; or,
the eNodeB periodically issues the time-frequency resources and the parameters of the SRS sent by all the UE in the coverage area of the RN; and/or the presence of a gas in the gas,
and when the preset triggering condition is met, the triggering performance of the eNodeB is issued to the RN, and the time-frequency resource and the parameters of the SRS sent by the UE or the plurality of UEs are appointed.
Preferably, the wireless channel characteristics include: DOA between the UE and the RN, and/or signal strength, and/or frequency selectivity of a wireless channel between the UE and the RN, and/or spatial characteristics of the channel, and/or time-frequency offset of the channel, and the RN analyzes the comparative distribution situation between the UE and the RN according to SRS of the UE.
According to the technical scheme, in the invention, the eNodeB informs the RN and the UE of: and the RN receives the SRS sent by the UE according to the notification of the eNodeB, acquires the wireless channel characteristic according to the SRS, and then carries out beam forming, time-frequency synchronization fine tuning and power control on a downlink signal sent to the UE according to the channel characteristic. Therefore, the RN can determine the channel characteristics between the UE and the RN and carry out downlink data transmission according to the characteristics, thereby greatly improving the downlink data transmission performance, improving the data receiving performance of the UE, reducing the wireless interference of the RN covering periphery and improving the wireless performance of the system.
Drawings
Fig. 1 is a schematic diagram of a network structure including relay nodes;
FIG. 2 is a schematic diagram of Type2 RN uplink and downlink;
fig. 3 is a schematic diagram of uplink and downlink in the embodiment of the present invention;
fig. 4 is a specific flowchart of a downlink data transmission method between an RN and a UE according to the present invention.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The basic idea of the invention is: and performing channel estimation between the UE and the RN, and performing data transmission according to the estimated channel characteristics, thereby improving the data transmission performance.
The following description is given of specific embodiments of the present invention. Fig. 3 is a schematic diagram of uplink and downlink in the embodiment of the present invention. In fig. 3, the UE is in the coverage area of both the eNB and the RN, but is closer to the RN, so that the channel quality is better, and data transmission is facilitated. The control channel interacts with the eNB through a Uu interface between the UE and the eNB, and the control channel is forwarded to the UE through the RN for the traffic channel. Fig. 4 is a specific flowchart of a downlink data transmission method between the RN and the UE in the structure shown in fig. 3. As shown in fig. 4, the method includes:
Among them, SRS (sounding reference signal) is an existing uplink reference signal.
The specific way for the eNodeB to notify the RN includes: the eNodeB informs the RN of the SRS configuration information and other basic information of each active UE in the range of the eNodeB or the RN through downlink control information between the eNodeB and the RN. The UE may periodically send corresponding information to the RN, or may aperiodically send SRS configuration information of the UE that satisfies the trigger condition to the RN when a preset trigger condition is satisfied.
In addition, the above-mentioned modes of the periodic issue and the triggered issue may be used independently, or may be used in combination. For example, the eNodeB sends, in a larger cycle, time-frequency resources and parameters of SRS to all UEs within its coverage; when the RN receives the SRS sent by the UE, the RN not only receives the SRS sent by the UE in the self coverage range, but also possibly receives the SRS sent by the UE not in the self coverage range, the RN carries out multi-level threshold value grading detection on the received SRS, judges whether the UE sending the SRS is in the self coverage range or not according to the amplitude of the SRS, if the UE is in the self coverage range, the preset triggering condition is considered to be reached, and the eNodeB sends the SRS configuration information of the UE reaching the preset triggering condition to the corresponding RN in time in an aperiodic way. And for the conditions of UE requiring switching from the adjacent cell to the coverage of the RN of the cell, and the like, the eNodeB transmits the SRS configuration information of the UE to the corresponding RN in time aperiodically.
The eNodeB can be implemented in the existing manner when notifying the UE of the time-frequency resources and parameters of the SRS to be transmitted.
And step 402, the UE sends the SRS according to the notice sent by the eNodeB.
And the UE sends the SRS according to the configuration information identified in the eNodeB notification. For example, the SRS is transmitted periodically or triggered.
In step 403, the RN receives an SRS sent by the UE according to the notification issued by the eNodeB, and obtains the radio channel characteristics between the UE and the RN according to the SRS.
The notification sent by the eNodeB comprises time-frequency resources and parameters of the SRS sent by the UE, and the RN receives the SRS according to the corresponding parameters on the corresponding time-frequency resources. Then, the channel characteristics between the UE and the RN are estimated according to the received SRS. The specific estimation method may adopt various existing estimation methods, and details thereof are not repeated here. The estimated characteristics of the radio channel between the UE and the RN include, but are not limited to: the method comprises the following steps of (1) obtaining the radio channel selection information of the UE-RN (uu), the DOA (DOA), the signal strength, the frequency selectivity of the radio channel, the spatial characteristics of the radio channel and the time-frequency offset, and integrating the comparative distribution situation of a plurality of UEs relative to the RN. Wherein, the comparative distribution situation between the multiple UE relative RNs is obtained by the comprehensive analysis and comparison of the RNs to the SRS of the multiple UE.
In step 404, the RN determines the transmission power, time-frequency offset, and antenna weighting factor for beamforming of the downlink traffic channel from the RN to the UE according to the estimated wireless channel characteristics.
And the RN estimates the uplink channel characteristics from the UE to the RN and determines the downlink channel characteristics according to the reciprocity of the wireless channel. And determining the sending power, time-frequency offset and antenna weighting factor for beamforming of the downlink service channel from the RN to the UE according to the downlink channel characteristics, wherein the specific determination mode can be the same as the existing mode, and is not repeated here.
The implementation of this step is the same as the existing approach.
The downlink transmission method in the embodiment of the present invention is ended.
Through the specific implementation of the invention, the eNodeB not only sends the time-frequency resources and parameters of the SRS to the UE, but also informs the RN of the corresponding information, so that the RN can simply and conveniently receive the SRS. Furthermore, since the SRS is known at the RN side, the RN can perform channel estimation between the RN and the UE by using the received SRS, and further can perform beamforming, time-frequency synchronization fine tuning, and transmit power control on downlink data to be transmitted to the UE by using the channel estimation result without adding uplink and downlink signaling. On one hand, the utilization rate of a downlink channel between the RN and the UE can be improved, and the interference of the RN to other UEs can be reduced, and on the other hand, the method is simple to implement and has no new requirement on the UE.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A method for transmitting downlink data between a relay node and a UE (user equipment), which is characterized by comprising the following steps:
for UE in the coverage range of any relay node RN, an eNodeB directly informs the RN and the UE, and the UE sends time-frequency resources and parameters of an SRS (sounding reference signal);
the UE sends an SRS according to a notification issued by an eNodeB, the RN receives the SRS according to the notification issued by the eNodeB, and acquires the wireless channel characteristic between the UE and the RN according to the SRS;
and the RN carries out beam forming, time-frequency synchronization fine tuning and power control on the downlink signal sent to the UE according to the wireless channel characteristics.
2. The method of claim 1, wherein the eNodeB directly informing the RN of the time-frequency resources and parameters of SRS transmission by the UE comprises:
the eNodeB periodically transmits the time-frequency resources and the parameters of the SRS to the RN, and all the UEs in the coverage area of the eNodeB transmit the time-frequency resources and the parameters of the SRS; or,
the eNodeB periodically issues the time-frequency resources and the parameters of the SRS sent by all the UE in the coverage area of the RN; and/or the presence of a gas in the gas,
and when the preset triggering condition is met, the triggering performance of the eNodeB is issued to the RN, and the time-frequency resource and the parameters of the SRS sent by the UE or the plurality of UEs are appointed.
3. The method of claim 1, wherein the wireless channel characteristics comprise: DOA between the UE and the RN, and/or signal strength, and/or frequency selectivity of a wireless channel between the UE and the RN, and/or spatial characteristics of the channel, and/or time-frequency offset of the channel, and the RN analyzes the comparative distribution situation between the UE and the RN according to SRS of the UE.
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| CN201010197716.7A CN102271352B (en) | 2010-06-03 | 2010-06-03 | Method for transmitting downlink data between relay node and UE |
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| CN201010197716.7A CN102271352B (en) | 2010-06-03 | 2010-06-03 | Method for transmitting downlink data between relay node and UE |
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| CN102271352B CN102271352B (en) | 2014-03-12 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102546138A (en) * | 2011-12-31 | 2012-07-04 | 电信科学技术研究院 | Beamforming method and device |
| CN106789800A (en) * | 2015-11-20 | 2017-05-31 | 华为技术有限公司 | A kind of method of down-going synchronous, apparatus and system |
| CN107659947A (en) * | 2016-07-26 | 2018-02-02 | 中兴通讯股份有限公司 | State measurement strategy and device, system |
| CN107769830A (en) * | 2016-08-19 | 2018-03-06 | 中兴通讯股份有限公司 | The method, apparatus and system for the sub- state that cooperates |
| CN108430090A (en) * | 2017-02-15 | 2018-08-21 | 华为技术有限公司 | The determining and method for determining DOA and access network equipment and terminal |
| CN109905150A (en) * | 2017-12-11 | 2019-06-18 | 梁平 | Distributed wireless antenna and millimeter wave scan repeater |
| WO2019140639A1 (en) * | 2018-01-19 | 2019-07-25 | Lenovo (Beijing) Limited | Method and apparatus for beam management |
| CN110999137A (en) * | 2017-08-10 | 2020-04-10 | 株式会社Ntt都科摩 | User device and reference signal transmission method |
| CN113258963A (en) * | 2015-08-10 | 2021-08-13 | 苹果公司 | Enhanced sounding reference signaling for uplink beam tracking |
| CN113286366A (en) * | 2020-02-20 | 2021-08-20 | 上海华为技术有限公司 | Beam management method, beam management system and related equipment |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102546138B (en) * | 2011-12-31 | 2014-07-09 | 电信科学技术研究院 | Beamforming method and device |
| CN102546138A (en) * | 2011-12-31 | 2012-07-04 | 电信科学技术研究院 | Beamforming method and device |
| CN113258963A (en) * | 2015-08-10 | 2021-08-13 | 苹果公司 | Enhanced sounding reference signaling for uplink beam tracking |
| CN106789800B (en) * | 2015-11-20 | 2020-04-21 | 华为技术有限公司 | Downlink synchronization method, device and system |
| CN106789800A (en) * | 2015-11-20 | 2017-05-31 | 华为技术有限公司 | A kind of method of down-going synchronous, apparatus and system |
| US11102744B2 (en) | 2015-11-20 | 2021-08-24 | Huawei Technologies Co., Ltd. | Downlink synchronization method, and apparatus and system cross-reference to related applications |
| US10645664B2 (en) | 2015-11-20 | 2020-05-05 | Huawei Technologies Co., Ltd. | Downlink synchronization method, and apparatus and system |
| CN107659947A (en) * | 2016-07-26 | 2018-02-02 | 中兴通讯股份有限公司 | State measurement strategy and device, system |
| CN107659947B (en) * | 2016-07-26 | 2022-08-02 | 中兴通讯股份有限公司 | State measurement method, device and system |
| CN107769830A (en) * | 2016-08-19 | 2018-03-06 | 中兴通讯股份有限公司 | The method, apparatus and system for the sub- state that cooperates |
| CN108430090B (en) * | 2017-02-15 | 2020-07-28 | 华为技术有限公司 | Method for determining and determining DOA, access network equipment and terminal |
| WO2018149346A1 (en) * | 2017-02-15 | 2018-08-23 | 华为技术有限公司 | Doa determining method, method for use in doa determining, access network device, and terminal |
| CN108430090A (en) * | 2017-02-15 | 2018-08-21 | 华为技术有限公司 | The determining and method for determining DOA and access network equipment and terminal |
| CN110999137A (en) * | 2017-08-10 | 2020-04-10 | 株式会社Ntt都科摩 | User device and reference signal transmission method |
| CN109905150A (en) * | 2017-12-11 | 2019-06-18 | 梁平 | Distributed wireless antenna and millimeter wave scan repeater |
| CN109905150B (en) * | 2017-12-11 | 2022-12-02 | 梁平 | Distributed wireless antenna and millimeter wave scanning repeater |
| WO2019140639A1 (en) * | 2018-01-19 | 2019-07-25 | Lenovo (Beijing) Limited | Method and apparatus for beam management |
| US11706001B2 (en) | 2018-01-19 | 2023-07-18 | Lenovo (Beijing) Limited | Method and apparatus for beam management |
| CN113286366A (en) * | 2020-02-20 | 2021-08-20 | 上海华为技术有限公司 | Beam management method, beam management system and related equipment |
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