CN102083124B - Method and system for dynamically feeding back system information sent and received by CoMP (Cooperation Multi-Point) - Google Patents
Method and system for dynamically feeding back system information sent and received by CoMP (Cooperation Multi-Point) Download PDFInfo
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Abstract
The invention discloses a method for dynamically feeding back system information sent and received by a CoMP (Cooperation Multi-Point). The method comprises the following steps of: dividing base stations (BS) in a wireless communication network into a plurality of system information feedback sets; selecting one of the BS as a main feedback BS in each system information feedback set; and feeding system information back to a user terminal (UT) by the main feedback BS. The invention also discloses a system for dynamically feeding back system information sent and received by a CoMP (Cooperation Multi-Point). In the invention, through the arrangement of the system information feedback sets, the BS in the wireless communication network is divided into a plurality of sets, thereby the feedback expense of the system information is reduced; in addition, the quantity of BS requiring the system information feedback is reduced, thereby a signaling interaction process and other physical processes while system information feedback are reduced so that the system expense is effectively reduced.
Description
Technical Field
The invention relates to the field of wireless network communication, in particular to a method and a system for dynamically feeding back system information transmitted and received by CoMP.
Background
In the next generation broadband wireless communication network, how to improve the throughput of an inter-cell User Terminal (UT) and the average UT throughput, especially the throughput and the peak rate of the UT at the cell edge, faces a serious challenge. At present, methods for transmitting and receiving by using a coordinated Multiple Point (CoMP) are proposed in 802.16j, Institute of Electrical and Electronics Engineers (IEEE), International Mobile telecommunications-Advanced (IMT-Advanced), and Wireless World planning New Radio (WINNER) to solve the above problems.
CoMP transmission and reception refers to joint transmission and reception between a single UT and a plurality of cooperating Base Stations (BSs) on the same radio resource. CoMP transmission and reception has two basic features:
1. each UT can be jointly served by multiple BSs through BS cooperation on the same radio resource. By doing so, the inter-cell interference can be mitigated, or changed to useful signal power.
2. Each BS is capable of serving multiple UTs on the same radio resource. By doing so, the throughput of all sectors is improved.
However, in the implementation process of CoMP transmission and reception, multiple cooperating BSs use the same resource to serve one UT, which may cause waste of resources; in the uplink with inter-cell interference, when CoMP transmission and reception are selected to be performed simultaneously on UT at the cell edge, severe inter-cell interference is caused, so that UT throughput, peak rate and average UT throughput at the cell edge are significantly reduced.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and a system for dynamically feeding back system information for CoMP transmission and reception, so as to save resources and reduce inter-cell interference when CoMP transmission and reception are implemented.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for dynamically feeding back system information transmitted and received by coordinated multi-point (CoMP), which comprises the following steps:
a Base Station (BS) in a wireless communication network is divided into a plurality of system information feedback sets, a main feedback BS is selected in each system information feedback set, and the main feedback BS feeds back system information to a User Terminal (UT).
The dividing of the wireless communication network into a plurality of system information feedback sets specifically includes:
determining the bandwidth capability and the performance requirement of the UT, and setting a system information feedback set selection threshold according to the bandwidth capability and the performance requirement;
and dividing the wireless communication network into a plurality of system information feedback sets according to the system information feedback set selection threshold value.
Bandwidth capabilities and performance requirements of the UT, including: path loss, propagation conditions, UT throughput and peak rate.
The method further comprises the following steps: and selecting the BS with the minimum inter-cell interference as the main feedback BS in each system information feedback set.
The feedback of the system information from the main feedback BS to the UT specifically includes:
the UT measures the wireless environment condition of the UT and reports the measurement result to a BS serving the UT;
the BS receiving the measurement result selects a threshold value from the system information feedback set, compares the threshold value with the measurement result, and determines the system information feedback set to which the BS belongs;
and the BS sends the system information to the UT through a main feedback BS in the system information feedback set.
The method further comprises the following steps:
if the system information feedback set to which the BS belongs is determined to be one, the system information is sent to the UT through a main feedback BS in the system information feedback set; and if the system information feedback sets to which the BSs belong are determined to be multiple, transmitting the system information to the UT through the main feedback BSs in each system information feedback set.
The invention also provides a system information dynamic feedback system for CoMP transmission and reception, wherein the BS in the system is divided into a plurality of system information feedback sets, each system feedback set is provided with a main feedback BS, and the main feedback BS is used for feeding back system information to the UT.
The BS is further configured to determine a bandwidth capability and a performance requirement of the UT, and set a system information feedback set selection threshold according to the bandwidth capability and the performance requirement; and dividing the BS in the wireless communication network into a plurality of system information feedback sets according to the system information feedback set selection threshold value.
Bandwidth capabilities and performance requirements of the UT, including: path loss, propagation conditions, UT throughput and peak rate.
The BS is further configured to select a BS with the smallest inter-cell interference as a primary feedback BS in each system information feedback set.
The BS is further configured to receive a measurement result reported by the UT through measurement of the wireless environment condition of the UT itself, compare the system information feedback set selection threshold with the measurement result, and determine a system information feedback set to which the BS belongs; and sending the system information to the UT through a main feedback BS in the system information feedback set.
The BS is further configured to, when it is determined that the system information feedback set to which the BS belongs is one, send system information to the UT through a primary feedback BS in the system information feedback set; and when the system information feedback sets to which the BSs belong are determined to be multiple, transmitting the system information to the UT through the main feedback BSs in each system information feedback set.
The invention provides a method and a system for dynamically feeding back system information transmitted and received by CoMP, which divide a BS in a wireless communication network into a plurality of system information feedback sets, select a main feedback BS in each system information feedback set, and feed back the system information to a UT by the main feedback BS. Through the setting of the system information feedback set, the BS in the wireless communication network is divided into a plurality of sets, so that the feedback overhead of the system information is reduced, and the resources are saved; in addition, the number of BSs needing to feed back system information is reduced, signaling interaction and other physical processes such as the times of hybrid automatic repeat request (HARQ) during system information feedback are reduced, and therefore system overhead is effectively reduced; and the inter-cell interference can be reduced, so that the UT throughput, peak rate and average UT throughput at the cell edge are obviously improved.
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Fig. 1 is a flowchart of a method for dynamically feeding back system information transmitted and received by CoMP.
Detailed Description
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
In order to save resources and reduce inter-cell interference when CoMP transmission and reception are realized, the invention provides a method for dynamically feeding back system information for CoMP transmission and reception, which has the core idea that: the method comprises the steps of dividing BSs in a wireless communication network into a plurality of system information feedback sets, selecting a main feedback BS in each system information feedback set, and feeding back system information from the main feedback BS to a UT.
Based on the core idea, the method for dynamically feeding back the system information sent and received by CoMP provided by the present invention, as shown in fig. 1, mainly includes the following steps:
The bandwidth capabilities and performance requirements of the UT may include: path loss, propagation conditions, UT throughput and peak rate, etc. Of course, the bandwidth capability and performance requirements in the present invention are not limited to the above parameters, and may be extended to other parameters according to actual needs.
And 102, the BS selects a threshold according to the system information feedback set, divides the wireless communication network into a plurality of system information feedback sets, and selects a main feedback BS in each system information feedback set.
After a plurality of system information feedback sets are divided, the BS with the minimum inter-cell interference can be selected as the main feedback BS in each system feedback set. Each divided system information feedback set only feeds back one type of system information, and all BSs in the system information feedback set can only feed back the system information through the selected main feedback BS.
For the division of the system information feedback set, taking the division into two sets as an example, the BS compares parameters in the bandwidth capability and performance requirement of the UT with a system information feedback set selection threshold, and if the parameters in the bandwidth capability and performance requirement are greater than the threshold, the BS is divided into a set 1; if less than the threshold, the BS is classified in set 2. When the system information feedback set is divided into a plurality of sets, the corresponding system information feedback set selection threshold value is a plurality of.
The measurement result reported by UT includes parameters such as path loss and inter-cell interference, but the measurement result in the present invention is not limited to this, and can also be expanded according to actual needs.
And 104, comparing the system information feedback set selection threshold value with the measurement result by the BS receiving the measurement result, and determining the system information feedback set to which the BS belongs.
For example, if the parameter in the measurement is less than threshold 1, then it is determined that the BS belongs to set 1; if the parameter in the measurement result is greater than the threshold 1 but less than the threshold 2, determining that the BS belongs to the set 2; if the parameter in the measurement result is greater than the threshold 2 but less than the threshold 3, determining that the BS belongs to the set 3; if the parameter in the measurement result is greater than the threshold value 3, it is determined that the BS belongs to the set 4.
And 105, the BS sends the system information to the UT through the main feedback BS in the system information feedback set.
Here, when the system information feedback set is divided, one BS may belong to only one system information feedback set or may belong to a plurality of system information feedback sets. If the system information feedback set to which the BS belongs is determined to be one, the system information needs to be sent to the UT through a main feedback BS in the system information feedback set; if the system information feedback sets to which the BSs belong are determined to be multiple, the system information needs to be sent to the UT through the main feedback BSs in each system information feedback set.
In order to implement the above method for dynamically feeding back the system information for CoMP transmission and reception, the BS of the system information dynamic feedback system for CoMP transmission and reception provided by the present invention is divided into a plurality of system information feedback sets, and each system feedback set is provided with a main feedback BS, and the main feedback BS is used for feeding back the system information to the UT.
The BS is further used for determining the bandwidth capability and the performance requirement of the UT, and setting a system information feedback set selection threshold according to the bandwidth capability and the performance requirement; and dividing the BS in the wireless communication network into a plurality of system information feedback sets according to the threshold selected by the system information feedback sets. Among other things, bandwidth capabilities and performance requirements of a UT include: path loss, propagation conditions, UT throughput and peak rate, etc.
The BS is further configured to select a BS with the smallest inter-cell interference as the primary feedback BS in each system information feedback set. Receiving a measurement result reported by the UT through measuring the wireless environment condition of the UT, selecting a threshold value from a system information feedback set, comparing the threshold value with the measurement result, and determining the system information feedback set to which the BS belongs; and sending the system information to the UT through a main feedback BS in the system information feedback set. Specifically, the method comprises the following steps: when the system information feedback set to which the BS belongs is determined to be one, the system information is sent to the UT through a main feedback BS in the system information feedback set; and when the system information feedback sets to which the BSs belong are determined to be multiple, the system information is sent to the UT through the main feedback BSs in each system information feedback set.
In summary, the method and system for dynamically feeding back system information sent and received by CoMP provided by the present invention divide the BS in the wireless communication network into multiple sets by setting the system information feedback set, so as to reduce the feedback overhead of the system information; in addition, the number of the BSs needing to feed back the system information is reduced, signaling interaction and other physical processes such as Hybrid Automatic Repeat Request (HARQ) times during system information feedback are reduced, and system overhead is further effectively reduced; and the inter-cell interference can be reduced, so that the UT throughput, peak rate and average UT throughput at the cell edge are obviously improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A method for dynamic feedback of system information for coordinated multi-point (CoMP) transmission and reception, the method comprising:
dividing Base Stations (BS) in a wireless communication network into a plurality of system information feedback sets, selecting a main feedback BS in each system information feedback set, and feeding back system information to a User Terminal (UT) by the main feedback BS; wherein,
the dividing the wireless communication network into a plurality of system information feedback sets comprises:
determining the bandwidth capability and the performance requirement of the UT, and setting a system information feedback set selection threshold according to the bandwidth capability and the performance requirement;
dividing the wireless communication network into a plurality of system information feedback sets according to the system information feedback set selection threshold; wherein bandwidth capabilities and performance requirements of the UT comprise: path loss, propagation conditions, UT throughput and peak rate.
2. The method of claim 1, wherein the method further comprises: and selecting the BS with the minimum inter-cell interference as the main feedback BS in each system information feedback set.
3. The method for dynamically feeding back system information for CoMP transmission and reception according to claim 2, wherein the system information is fed back to the UT by the primary feedback BS, and specifically comprises:
the UT measures the wireless environment condition of the UT and reports the measurement result to a BS serving the UT;
the BS receiving the measurement result selects a threshold value from the system information feedback set, compares the threshold value with the measurement result, and determines the system information feedback set to which the BS belongs;
and the BS sends the system information to the UT through a main feedback BS in the system information feedback set.
4. The method of claim 3, wherein the method further comprises:
if the system information feedback set to which the BS belongs is determined to be one, the system information is sent to the UT through a main feedback BS in the system information feedback set; and if the system information feedback sets to which the BSs belong are determined to be multiple, transmitting the system information to the UT through the main feedback BSs in each system information feedback set.
5. A system information dynamic feedback system for CoMP transmission and reception is characterized in that a BS in the system is divided into a plurality of system information feedback sets, each system feedback set is provided with a main feedback BS, and the main feedback BSs are used for feeding back system information to UTs; wherein,
the BS is further configured to determine a bandwidth capability and a performance requirement of the UT, and set a system information feedback set selection threshold according to the bandwidth capability and the performance requirement; dividing the BS in the wireless communication network into a plurality of system information feedback sets according to the system information feedback set selection threshold; wherein bandwidth capabilities and performance requirements of the UT comprise: path loss, propagation conditions, UT throughput and peak rate.
6. The system information dynamic feedback system for CoMP transmission and reception according to claim 5, wherein said BS is further configured to select a BS with minimum inter-cell interference as a primary feedback BS in each system information feedback set.
7. The system for dynamically feeding back system information for CoMP transmission and reception according to claim 6, wherein the BS is further configured to receive a measurement result reported by the UT through measurement of its own wireless environment condition, and compare the system information feedback set selection threshold with the measurement result to determine the system information feedback set to which the BS belongs; and sending the system information to the UT through a main feedback BS in the system information feedback set.
8. The system information dynamic feedback system for CoMP transmission and reception according to claim 7, wherein the BS is further configured to transmit system information to the UT through a primary feedback BS in the system information feedback set when it is determined that the system information feedback set to which the BS belongs is one; and when the system information feedback sets to which the BSs belong are determined to be multiple, transmitting the system information to the UT through the main feedback BSs in each system information feedback set.
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| CN102843729B (en) * | 2011-06-22 | 2017-03-15 | 中兴通讯股份有限公司 | CoMP system information updating method and main serving cell |
| WO2013166710A1 (en) * | 2012-05-11 | 2013-11-14 | 富士通株式会社 | Information feedback method, user equipment and base station for coordinated multi-point |
| MA39220B1 (en) * | 2014-01-31 | 2017-08-31 | ERICSSON TELEFON AB L M (publ) | Methods and nodes relating to system information acquisition during a flexible subframe operation |
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| CN101132632A (en) * | 2007-09-25 | 2008-02-27 | 中国科学技术大学 | Master-salve cooperating communication method in distributed radio communication system |
| CN101373998A (en) * | 2007-08-20 | 2009-02-25 | 上海贝尔阿尔卡特股份有限公司 | Low information interactive multi-base station collaboration MIMO as well as scheduling method and apparatus thereof |
| CN101442808A (en) * | 2008-12-26 | 2009-05-27 | 西安电子科技大学 | United scheduling method for ascending multi-point collaboration in LTE-A |
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| CN101373998A (en) * | 2007-08-20 | 2009-02-25 | 上海贝尔阿尔卡特股份有限公司 | Low information interactive multi-base station collaboration MIMO as well as scheduling method and apparatus thereof |
| CN101132632A (en) * | 2007-09-25 | 2008-02-27 | 中国科学技术大学 | Master-salve cooperating communication method in distributed radio communication system |
| CN101442808A (en) * | 2008-12-26 | 2009-05-27 | 西安电子科技大学 | United scheduling method for ascending multi-point collaboration in LTE-A |
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