CN101945443B - A kind of information notice method and system - Google Patents
A kind of information notice method and system Download PDFInfo
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- CN101945443B CN101945443B CN200910088132.3A CN200910088132A CN101945443B CN 101945443 B CN101945443 B CN 101945443B CN 200910088132 A CN200910088132 A CN 200910088132A CN 101945443 B CN101945443 B CN 101945443B
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Abstract
The invention discloses a kind of information notice method and system, with so that each transmission point that needs issue data to same UE obtains respective down transmitting power information simultaneously.A kind of information notice method that the present invention provides includes: the Serving cell of user equipment (UE), determines the down transmitting power information needing simultaneously to issue for described UE corresponding to each transmission point of data；Down transmitting power information corresponding to the transmission point of UE is notified to this transmission point by described Serving cell.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an information notification method and system.
Background
Coordinated Multi-point transmission/reception (CoMP) technology refers to that a plurality of transmission points separated in a geographical position cooperate to participate in data transmission/reception to the same User Equipment (UE) so as to improve the quality of signals received by edge users, including downlink CoMP transmission (downlink CoMP) and uplink CoMP reception (uplink CoMP).
Downlink CoMP is divided into two categories: joint processing and coordinated scheduling/beamforming. When joint processing is adopted, downlink data may be issued at each transmission point in a CoMP coordination set (CoMP coordination set). The CoMP coordination set is a transmission point set which is determined by the network side and is possible to send data, and is generally dynamically determined by the network side based on an implementation algorithm. The combined treatment can be further divided into two types: joint transmission and dynamic cell selection. The joint transmission refers to that a plurality of transmission points transmit Physical Downlink Shared Channel (PDSCH) data simultaneously; dynamic cell selection refers to only one transmission point issuing PDSCH data at a time.
Each transmission point which simultaneously issues data to the UE may belong to a serving cell of the UE or a cooperating cell of the UE. A so-called serving cell, i.e., a serving cell in a long term evolution system (LTE), has a radio link control (RRC) connection with a UE and is responsible for indicating downlink data allocation information to the UE through a Physical Downlink Control Channel (PDCCH). The cooperative cell refers to a neighboring cell participating in downlink data transmission at a certain time. The cooperating cell and the serving cell of the same UE may belong to the same evolved node b (eNB) or may belong to different enbs.
Downlink CoMP techniques have currently determined to demodulate PDSCH data using UE-specific reference signals (DRS). For DRS, it is generally considered that the same processing is performed on the downlink data resource unit and the reference signal resource unit, and the power of the data resource unit and the power of the reference signal resource unit can be completely consistent. Therefore, when determining the transmitting power of the downlink data, the network side can dynamically adjust the downlink transmitting power of each transmission point participating in the joint transmission without being limited by the values of the configured downlink power control parameters PA and PB, so as to reduce the interference to the adjacent cell as much as possible while ensuring the data transmission performance.
In the joint processing mode, downlink data and scheduling information need to be interacted and shared between a transmission point participating in data issuing and a serving cell, and the scheduling information comprises transmission time point information, time-frequency resource information occupied by transmission, downlink antenna transmission mode information and the like. If the cell to which the transmission point belongs is the serving cell of the UE, or the cell to which the transmission point belongs and the serving cell belong to the same eNB (Intra-eNB DL CoMP), data and scheduling information sharing is easily achieved. If the cell to which the transmission point belongs and the serving cell belong to different enbs (Inter-eNB DL CoMP), the sharing of data and scheduling information needs to be done through interface messages between the enbs. Data transmission between enbs is currently implemented via the X2 interface. The X2 interface control plane provides reliable transmission for signaling messages in a Simple Control Transmission Protocol (SCTP) manner, and the user plane provides a user data transmission function between enbs based on an IP network.
In summary, in downlink CoMP in the prior art, one or more transmission points need to transmit data to the same UE at the same time, and therefore, data, scheduling information, power information, and the like need to be shared among the transmission points. However, in the prior art, a technical scheme of how to acquire downlink transmission power information by each transmission point that needs to send data to the same UE at the same time is not given.
Disclosure of Invention
The embodiment of the invention provides an information notification method and an information notification system, which are used for enabling each transmission point needing to send data to the same UE to obtain respective downlink transmission power information.
The information notification method provided by the embodiment of the invention comprises the following steps:
a serving cell of User Equipment (UE) determines downlink transmission power information corresponding to each transmission point which needs to simultaneously send data for the UE;
and the serving cell informs the transmission point of the downlink transmission power information corresponding to the transmission point of the UE.
The communication system provided by the embodiment of the invention comprises:
a serving cell unit, configured to establish Radio Resource Control (RRC) connection with User Equipment (UE), and determine downlink transmission power information corresponding to transmission points that need to simultaneously issue data for the UE; informing downlink transmitting power information corresponding to a transmission point of the UE to the transmission point;
and the transmission point is used for receiving the downlink transmitting power information sent by the serving cell unit and sending data to the UE according to the downlink transmitting power information.
In the embodiment of the invention, downlink transmitting power information corresponding to each transmission point which needs to simultaneously send data for User Equipment (UE) is determined by a serving cell of the UE; the serving cell notifies the transmission point of the downlink transmission power information corresponding to the transmission point of the UE, so that each transmission point which needs to send data to the same UE at the same time can acquire the respective downlink transmission power information and further determine the respective downlink transmission power, the power control of downlink CoMP is realized, and the interference in the system is reduced on the basis of ensuring the downlink data transmission performance.
Drawings
Fig. 1 is a schematic flowchart of an information notification method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides an information notification method and an information notification system, which are used for enabling each transmission point needing to send data to the same UE to obtain respective downlink transmission power information.
The technical solution provided by the embodiment of the present invention is explained below with reference to the accompanying drawings.
Referring to fig. 1, an information notification method provided in an embodiment of the present invention includes the steps of:
s101, a service cell of the UE determines downlink transmitting power information corresponding to each transmission point which needs to send data to the UE at the same time.
Each transmission point that needs to issue data for the UE at the same time, i.e., each transmission point that participates in joint transmission for the same UE.
S102, the service cell informs the transmission point of the downlink transmission power information corresponding to the transmission point of the UE.
Preferably, when a cell to which a transmission point of the UE belongs and a serving cell of the UE belong to different base stations (enbs), the serving cell notifies the transmission point of downlink transmission power information corresponding to the transmission point of the UE through an X2 interface.
The serving cell may determine downlink transmit power information corresponding to the transmission point according to downlink Channel State Information (CSI) reported by the UE, allocated time-frequency resources, power limitation of the transmission point, and other factors.
The time for notifying the downlink transmission power information can be determined in three ways:
the first method is as follows: the serving cell periodically notifies the transmission point of the downlink transmission power information corresponding to the transmission point of the UE.
The second method comprises the following steps: and the serving cell notifies the transmission point of the downlink transmission power information corresponding to the transmission point of the UE in real time according to the change of the network state.
The third method comprises the following steps: the serving cell notifies the transmission point of the UE of downlink transmission power information corresponding to the transmission point while sending scheduling information to the transmission point, where the scheduling information includes the downlink transmission power information.
Regarding to the first method, the serving cell periodically sends downlink transmit power information to each transmission point that may participate in downlink data transmission for the same UE according to factors such as downlink channel state information reported by the UE and power limitation of the transmission point. The sending period of the downlink transmission power information may be determined according to the period of the downlink channel state information reported by the UE, the bandwidth allocated to the X2 interface, and other factors. For example, if the UE periodically feeds back downlink channel state information (e.g., periodically reports CQI), the serving cell may determine, according to a downlink multiple transmission point Multiple Input Multiple Output (MIMO) mode, a preferred downlink transmit power of each transmission point by using a certain power control rule (e.g., a water injection theorem) based on the downlink channel state information reported by the UE and for each transmission point, and then notify each transmission point.
Regarding the second method, the serving cell sends downlink transmission power information to a transmission point only when the downlink transmission power of the transmission point needs to be updated according to the change of the network state. Reasons for the update (i.e., network state change) may include the following:
(a) the UE periodically reports the state information of the downlink channel, and the serving cell determines that the downlink transmitting power of the transmission point needs to be modified at some reporting time;
(b) the UE non-periodically reports the state information of the downlink channel, and the serving cell determines the transmitting power of each transmission point at the reporting time;
(c) the MIMO mode of the downlink multi-transmission point is changed, and the serving cell judges that the transmitting power of each transmission point needs to be changed along with the change of the MIMO mode;
(d) and the transmission point set participating in the joint transmission changes, and the serving cell judges that the transmission power of each transmission point needs to change along with the change. The transmission point set referred to herein is a set formed by transmission points participating in data transmission to the same UE at the same time, and is a subset of a CoMP cooperating set.
The second mode only interacts downlink transmission power information when needed, and compared with the first mode, partial traffic overhead of an X2 interface can be saved.
Regarding the third method, when the serving cell interacts data and scheduling information between transmission points participating in joint transmission of data at a certain time, downlink transmission power information is interacted, and the downlink transmission power information may be included in the scheduling information and simultaneously transmitted to each transmission point. The third mode can directly correspond the downlink transmitting power information with certain data transmission of a certain transmission point, and can determine the downlink transmitting power in real time based on the scheduling condition, so that the accuracy is higher compared with the first mode and the second mode, but the flow cost is higher.
When the serving cell issues the downlink transmission power information in the first or second mode, the target transmission point for issuing the downlink transmission power information may be: a transmission point in a downlink CoMP measurement set; or, the UE reports the transmission points (belonging to a subset of the CoMP measurement set) of the downlink channel state information.
The CoMP measurement set refers to a set of transmission points (or cells) where the UE may report channel state information, and the set is configured by the network side, is a relatively large set, and changes slowly. The CoMP cooperating set may be considered a subset of the CoMP measurement set.
When the serving cell issues downlink transmission power information in the first mode or the second mode, after each transmission point receives the downlink transmission power information corresponding to the transmission point, the downlink transmission power information is stored, downlink transmission power required to be adopted is determined according to the downlink transmission power information, and data is issued by adopting the downlink transmission power. And when a certain transmission point does not belong to the members of the CoMP measurement set, the serving cell informs the transmission point to delete the downlink transmission power information corresponding to the transmission point.
When the serving cell issues downlink transmission power information in the third mode, each transmission point receives the downlink transmission power information corresponding to the transmission point, and deletes the downlink transmission power information corresponding to the transmission point after issuing data to the UE according to the downlink transmission power information corresponding to the transmission point.
Preferably, after receiving the downlink transmission power information corresponding to the UE, the transmission point of the UE may determine the downlink transmission power according to the downlink transmission power information corresponding to the UE, and may further adjust the downlink transmission power according to the condition of the UE. That is to say, the downlink transmission power finally determined by each transmission point may be the downlink transmission power indicated by the serving cell, or may be the downlink transmission power adjusted according to the self condition based on the indication of the serving cell.
The downlink transmission power information is used for indicating the downlink transmission power used by the transmission point on the occupied time-frequency resource in the downlink joint processing mode, and the granularity of the downlink transmission power information indicated by any transmission point can be as follows:
the first method comprises the following steps: only one downlink transmit power value is specified per transmission point on a UE basis, i.e. for each UE.
The serving cell indicates a unique downlink transmission power value for each transmission point for the same UE, which indicates that the corresponding transmission point uses the power value to send data to the UE on all allocated downlink resource blocks.
And the second method comprises the following steps: one downlink transmit power value is assigned per downlink subband per transmission point on a subband basis, i.e., for each UE.
The sub-band is a resource block set consisting of a plurality of consecutive adjacent resource blocks.
A specific resource block included in a certain sub-band may be agreed in advance between the serving cell and the transmission point, and the serving cell indicates, for all or some sub-bands, a downlink transmission power value corresponding to each sub-band, indicating that the corresponding transmission point uses the same downlink transmission power value (downlink transmission power corresponding to the sub-band) to transmit data to the UE on the allocated resource block belonging to the same sub-band.
Each transmission point may correspond to multiple downlink subbands and thus may correspond to multiple downlink transmit power values.
And the third is that: one downlink transmit power value is assigned per downlink resource block per transmission point on a resource block basis, i.e. for each UE.
The service cell indicates the transmission power value corresponding to each resource block for all or some resource blocks, and indicates that the corresponding transmission point uses the downlink transmission power value corresponding to the resource block to send data to the UE on the allocated resource block.
Each transmission point may correspond to multiple downlink resource blocks, and thus each transmission point may correspond to multiple downlink transmit power values.
According to the three rules, the signaling overhead of the first given downlink transmission power information is minimum; the third kind of downlink transmit power information is given in the most detail.
In practical application, it may be determined comprehensively which granularity is specifically adopted to notify the downlink transmission power information according to bandwidth of an X2 interface between enbs, data transmission performance requirements, and the like.
In summary, each transmission point of the UE corresponds to one downlink transmission power information (the downlink transmission power information corresponding to each transmission point may be the same or different); or,
each transmission point of the UE corresponds to a plurality of items of downlink transmission power information, wherein each item of downlink transmission power information corresponds to one downlink resource block of the transmission point or corresponds to one downlink sub-band of the transmission point.
In addition, in the embodiment of the present invention, in addition to determining the downlink transmission power for each transmission point of the UE, the serving cell may also determine the downlink transmission power for each transmission point of the UE through an Operation and Maintenance Center (OMC), or each transmission point of the UE determines its own downlink transmission power independently according to a downlink power control related algorithm.
The system provided by the embodiment of the invention is described below.
Referring to fig. 2, a communication system provided in an embodiment of the present invention includes: a serving cell unit 11 and at least one transmission point 12.
A serving cell unit 11, configured to establish an RRC connection with a UE, and determine downlink transmission power information corresponding to each transmission point 12 that needs to issue data for the UE at the same time; and informing the downlink transmission power information corresponding to the transmission point 12 of the UE to the transmission point 12.
And the transmission point 12 is configured to receive downlink transmission power information sent by the serving cell unit 11, and send data to the UE according to the downlink transmission power information.
The serving cell unit 11 and the transmission point 12 may be located in the same base station (eNB) or in different enbs, and each transmission point 12 may be located in the same eNB or in different enbs.
Preferably, when serving cell unit 11 and transmission point 12 are located in different base stations, serving cell unit 11 notifies the transmission point of downlink transmission power information corresponding to transmission point 12 of the UE through X2 interface.
Preferably, the serving cell unit 11 periodically notifies the transmission point 12 of downlink transmission power information corresponding to the transmission point 12 of the UE; or,
the serving cell unit 11 notifies the transmission point 12 of downlink transmission power information corresponding to the transmission point 12 of the UE in real time according to the network state change.
In both cases, when the transmission point 12 does not belong to a member of the CoMP measurement set, the serving cell unit 11 notifies the transmission point 12 to delete the downlink transmission power information corresponding to the transmission point.
The serving cell unit 11 may also send scheduling information to the transmission point 12 of the UE, and notify the transmission point 12 of downlink transmission power information corresponding to the transmission point 12, where the scheduling information includes the downlink transmission power information.
In this case, the transmission point 12 deletes the downlink transmission power information after receiving the downlink transmission power information and sending data to the UE according to the downlink transmission power information.
Preferably, after receiving the downlink transmission power information, the transmission point 12 determines the downlink transmission power according to the downlink transmission power information, and adjusts the downlink transmission power.
Preferably, the serving cell unit 11 determines that each transmission point 12 of the UE corresponds to one downlink transmission power information; or,
the serving cell unit 11 determines that each transmission point 12 of the UE corresponds to multiple items of downlink transmission power information, where each item of downlink transmission power information corresponds to one downlink resource block of the transmission point 12 or corresponds to one downlink subband of the transmission point 12.
In summary, the embodiment of the present invention provides a scheme for transmitting downlink transmission power information between a serving cell of a UE and each coordinated transmission point of the UE in a downlink CoMP joint processing manner, and the serving cell sends the downlink transmission power information to each transmission point participating in joint transmission, so as to implement power control of downlink CoMP and reduce interference in a system on the basis of ensuring downlink data transmission performance.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (14)
1. An information notification method, comprising:
a serving cell of User Equipment (UE) determines downlink transmission power information corresponding to each transmission point which needs to simultaneously send data for the UE;
the serving cell notifies downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point;
the step of notifying downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point by the serving cell includes:
the serving cell periodically notifies downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point; or,
and the serving cell notifies the downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point in real time according to the change of the network state.
2. The method of claim 1, wherein the step of the serving cell notifying downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point comprises:
and when the cell to which the transmission point of the UE belongs and the serving cell belong to different base stations, the serving cell informs the transmission point of downlink transmission power information corresponding to the transmission point of the UE through an X2 interface.
3. The method of claim 1, wherein after the transmission point of the UE receives downlink transmission power information corresponding to the transmission point, the method further comprises:
and when the transmission point of the UE does not belong to the member of the coordinated multi-point transmission CoMP measurement set, the service cell informs the transmission point to delete the downlink transmission power information corresponding to the transmission point.
4. The method of claim 1, wherein the step of the serving cell notifying downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point comprises:
the serving cell notifies a transmission point of the UE of downlink transmission power information corresponding to the transmission point while sending scheduling information to the transmission point, where the scheduling information includes the downlink transmission power information.
5. The method of claim 4, wherein after the transmission point of the UE receives downlink transmission power information corresponding to the transmission point, the method further comprises:
and after the transmission point of the UE transmits data to the UE according to the downlink transmission power information corresponding to the transmission point, deleting the downlink transmission power information corresponding to the transmission point.
6. The method of claim 1, wherein after the transmission point of the UE receives downlink transmission power information corresponding to the transmission point, the method further comprises:
and the transmission point of the UE determines the downlink transmitting power according to the downlink transmitting power information corresponding to the transmission point and adjusts the downlink transmitting power.
7. The method of claim 1, wherein each transmission point of the UE corresponds to a downlink transmission power information; or,
each transmission point of the UE corresponds to a plurality of items of downlink transmission power information, wherein each item of downlink transmission power information corresponds to one downlink resource block of the transmission point or corresponds to one downlink sub-band of the transmission point.
8. A communication system, the system comprising:
a serving cell unit, configured to establish Radio Resource Control (RRC) connection with User Equipment (UE), and determine downlink transmission power information corresponding to transmission points that need to simultaneously issue data for the UE; notifying downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point;
the transmission point is used for receiving the downlink transmitting power information sent by the serving cell unit and sending data to the UE according to the downlink transmitting power information;
the serving cell unit periodically notifies downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point; or,
and the serving cell unit notifies downlink transmission power information corresponding to each transmission point of the UE to the corresponding transmission point in real time according to the network state change.
9. The system of claim 8, wherein when said serving cell unit is located at a different base station than said transmission point,
and the serving cell unit notifies the transmission point of the downlink transmission power information corresponding to the transmission point of the UE through an X2 interface.
10. The system of claim 8, wherein when the transmission point does not belong to a member of a CoMP measurement set, the serving cell unit notifies the transmission point to delete its corresponding downlink tx power information.
11. The system of claim 8, wherein the serving cell unit, while sending scheduling information to a transmission point of a UE, notifies the transmission point of downlink transmission power information corresponding to the transmission point, wherein the scheduling information includes the downlink transmission power information.
12. The system of claim 11, wherein the transmission point deletes the downlink transmission power information after receiving the downlink transmission power information and sending data to the UE according to the downlink transmission power information.
13. The system of claim 8, wherein the transmission point, after receiving the downlink transmit power information, determines a downlink transmit power according to the downlink transmit power information, and adjusts the downlink transmit power.
14. The system according to claim 8, wherein said serving cell unit determines that each transmission point of said UE corresponds to a downlink transmission power information; or,
and the serving cell unit determines that each transmission point of the UE corresponds to a plurality of items of downlink transmission power information, wherein each item of downlink transmission power information corresponds to one downlink resource block of the transmission point or corresponds to one downlink sub-band of the transmission point.
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| US9204481B2 (en) | 2011-10-07 | 2015-12-01 | Futurewei Technologies, Inc. | System and method for transmitting uplink data associated with downlink multiple point transmission |
| CN103916945B (en) * | 2013-01-04 | 2018-02-16 | 中兴通讯股份有限公司 | A kind of collocation method and device of descending power parameter |
| WO2024031604A1 (en) * | 2022-08-12 | 2024-02-15 | Qualcomm Incorporated | Coherent joint transmissions with transmission reception point (trp) level power restrictions |
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| CN101159662A (en) * | 2006-10-06 | 2008-04-09 | 富士通株式会社 | Mobile wireless communication system and control method, access gateway and wireless base station |
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210604 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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