WO2017016477A1 - 一种协调小区边缘用户干扰的方法、装置及基站 - Google Patents

一种协调小区边缘用户干扰的方法、装置及基站 Download PDF

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Publication number
WO2017016477A1
WO2017016477A1 PCT/CN2016/091873 CN2016091873W WO2017016477A1 WO 2017016477 A1 WO2017016477 A1 WO 2017016477A1 CN 2016091873 W CN2016091873 W CN 2016091873W WO 2017016477 A1 WO2017016477 A1 WO 2017016477A1
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interference
cell edge
edge user
user
interference source
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PCT/CN2016/091873
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English (en)
French (fr)
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杨易
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

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  • the present application relates to, but is not limited to, the field of communications, and in particular, to a method, an apparatus, and a base station for coordinating cell edge user interference.
  • 3GPP 3rd Generation Partnership Project
  • 3GPP 3rd Generation Partnership Project proposes 3G LTE (Long Term Evolution) .
  • LTE adopts OFDM (Orthogonal Frequency Divided Multiple Access), and OFDM technology uses orthogonality between frequencies as a method of distinguishing users, and carries information of users on different carriers that are orthogonal to each other. Can effectively combat frequency selective fading.
  • OFDM Orthogonal Frequency Divided Multiple Access
  • the frequencies used by the users in the cell are orthogonal to each other, all the interferences are from other cells, and the SINR (Signal to Interference plus Noise Ratio) of the cell center user can be greatly improved, thereby providing Higher data rates and better quality of service.
  • the cell edge user (the area covered by the radio signal is called a cell, generally refers to the range that the signal of one base station can cover, and the cell edge is generally a place with poor coverage, and the users in the range are called cell edge users.
  • the user who occupies the same carrier resource in the neighboring cell has a relatively large interference, and the SINR is relatively small from the base station, which results in a relatively low throughput of the entire cell, but the service quality of the cell edge user is poor. The situation is low throughput.
  • 3GPP proposes various solutions, including interference randomization, interference deletion, and interference coordination technology.
  • the interference randomization uses the statistical characteristics of the interference to suppress the interference, and the error is large;
  • the interference deletion technology can significantly improve the system performance at the cell edge and obtain higher spectrum efficiency, but for services with smaller bandwidth (such as VoIP) Not very suitable, the implementation in OFDM system is also more complicated, and subsequent research on it There is not much research; interference coordination/avoidance is a hot technology in current research. It is simple to implement, can be applied to services with multiple bandwidths, and has good effects on interference suppression.
  • the interference coordination technology in the downlink channel is a hot spot in the related art.
  • most of them are limited to power control, resource block scheduling and other means, and these methods have a certain negative impact on transmission performance.
  • increasing the number of RBs (Resource Blocks) of edge users will undoubtedly reduce the number of available RBs for the central users, which will reduce the throughput of the central users (when the system load is high), and the total cell throughput will decrease.
  • the means for improving the SINR of the edge user is that the edge user of the cell uses the same location RB resource as the center user of the neighboring cell, and reduces the transmission power of the RB resource in the neighboring cell center (when the load is high), or does not transmit (the load is low) Time) to reduce neighborhood interference.
  • reducing the transmit power of the RB resources in the neighboring cell center can easily cause interference with the SINR of the central user in the neighboring cell, thereby reducing the total throughput of the central user and the cell.
  • the related interference coordination mode affects the overall performance of the system to different degrees, and cannot solve the interference problem of the cell edge user, and the user experience is poor.
  • the embodiments of the present invention provide a method, a device, and a base station for coordinating cell edge user interference, which solve the problem that the cell edge interference in the LTE system exists in the related art, but the related interference coordination mode affects the system to different degrees.
  • the overall performance cannot solve the interference problem of the cell edge users and the user experience is poor.
  • a method for coordinating cell edge user interference includes: receiving a RSRP (Reference Signal Receiving Power) list fed back by a cell edge user, determining a interference source having the strongest interference to the cell edge user; receiving the a first PMI (Precoding Matrix Indicator) value obtained by performing channel estimation on the interference source by the cell edge user; determining, according to the first PMI value, the interference source and the The second matching PMI value that is the most orthogonal to the precoding weight is obtained by the cell edge user, and the second PMI value is sent to the interference source, so that the interference source is based on The second PMI value is The scheduling of the row user.
  • RSRP Reference Signal Receiving Power
  • the determining that the interference source that has the strongest interference to the cell edge user comprises: selecting a neighboring cell with the largest RSRP value from the RSRP list, and determining the selected neighboring cell as the cell. Edge users interfere with the strongest sources of interference.
  • the method further includes: sending an indication for performing channel estimation on the interference source to the cell edge user before receiving the first PMI value obtained by performing channel estimation on the interference source by the cell edge user information.
  • the method further includes: after transmitting, to the cell edge user, indication information for performing channel estimation on the interference source, the cell edge user parses the indication information of the channel estimation, to obtain the interference source. Address information; reading the interference source according to the address information, performing channel estimation with the interference source; and determining the first PMI value according to the channel estimation.
  • the method further includes: after receiving the reference signal received power RSRP list fed back by the cell edge user, transmitting resource allocation information of the user to the interference source; and feeding back the resource allocation information by receiving the interference source In the case of receiving information, it is determined that the interference source has interference coordination capability.
  • An apparatus for coordinating cell edge user interference includes: a receiving module, a determining module, and a sending module.
  • a receiving module configured to receive a reference signal received power RSRP list fed back by the cell edge user, to determine an interference source that has the strongest interference to the cell edge user; and the receiving module is further configured to receive the cell edge user to perform the interference source a first PMI value obtained by the channel estimation, the determining module is configured to determine, according to the first PMI value, a precoding weight that is the best match between the interference source and the cell edge user in the preset codebook, and obtain a solution a second PMI value having the strongest orthogonality of the precoding weight; the sending module is configured to send the second PMI value to the interference source, and the interference source is performed by the user according to the second PMI value Scheduling.
  • the receiving module includes: a receiving unit and a determining unit.
  • the receiving unit is configured to receive the RSRP list fed back by the cell edge user.
  • the receiving module determines that the interference source that has the strongest interference to the edge user of the cell includes:
  • a determining unit configured to select a neighboring cell with the largest RSRP value from the RSRP list, and The selected neighboring cell is determined as the interference source that has the strongest interference to the cell edge user.
  • the sending module is further configured to send the interference to the cell edge user before the receiving module receives the first PMI value obtained by performing channel estimation on the interference source by the cell edge user.
  • the source performs indication of channel estimation.
  • the sending module is further configured to: after the receiving module receives the reference signal receiving power RSRP list fed back by the cell edge user, send the resource allocation information of the user to the interference source; the determining module further sets In order to feed back the acknowledgement information of the resource allocation information to the interference source, it is determined that the interference source has interference coordination capability.
  • a base station includes: the apparatus for coordinating cell edge user interference.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the method of coordinating cell edge user interference.
  • the embodiment of the present invention utilizes the feedback information of the user, that is, determines the interference source with the strongest interference of the cell edge user according to the RSRP list, and then determines the first PMI value of the interference source and the user of the cell edge, and then uses the principle of interference to determine and
  • the first PMI value corresponds to the second PMI value with the strongest orthogonality of the precoding weight
  • the interference source is used for user scheduling by using the second PMI value, and the user experience is high
  • the method is used by the user feedback and between the cells.
  • FIG. 1 is a flowchart of a method for coordinating cell edge user interference in an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of an apparatus for coordinating cell edge user interference in an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a device receiving module for coordinating cell edge user interference in an embodiment of the present invention
  • Example 4 is a flowchart of an interference coordination method of Example 1 in an alternative embodiment of the present invention.
  • FIG. 5 is a flowchart of an interference coordination method of Example 2 in an alternative embodiment of the present invention.
  • the related interference coordination manner affects the overall performance of the system to different degrees, and cannot solve the interference problem of the cell edge user, and the user experience is poor.
  • the embodiments of the present invention provide a method, an apparatus, and a base station for coordinating cell edge user interference.
  • the embodiments of the present invention are described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the embodiments described herein are merely illustrative of the embodiments of the invention, It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • the embodiment of the invention provides a method for coordinating cell edge user interference.
  • the process of the method is as shown in FIG. 1 and includes steps S101 to S104:
  • S101 Receive an RSRP list fed back by a cell edge user, and determine an interference source that has the strongest interference to the cell edge user.
  • S102 Receive a first PMI value obtained by performing cell estimation on an interference source by a cell edge user.
  • the embodiment of the present invention utilizes the feedback information of the user, that is, determines the interference source with the strongest interference of the cell edge user according to the RSRP list, and then determines the first PMI value of the interference source and the user of the cell edge, and then uses the principle of interference to determine and
  • the first PMI value corresponds to the second PMI value with the strongest orthogonality of the precoding weight
  • the interference source is used for user scheduling by using the second PMI value, and the user experience is high
  • the method is used by the user feedback and between the cells.
  • the base station needs to receive the CSI (Channel State Information) and the SINR value fed back by each edge user; determine the cell edge user group that needs to coordinate the interference according to the CSI and the SINR value, and determine the cell edge user group. Thereafter, monitoring and interference coordination is performed for the cell edge users in the cell edge user group.
  • CSI Channel State Information
  • SINR SINR value
  • the RSRP list fed back by the cell edge user is first received, and then the neighbor cell with the largest RSRP value is selected from the RSRP list, and the neighbor cell is determined to be the interference source with the strongest interference to the cell edge user.
  • the base station transmits indication information for channel estimation to the interference source to the cell edge user.
  • the cell edge user parses the channel estimation indication information to obtain the address information of the interference source; reads the interference source according to the address information to perform channel estimation with the interference source; determines the first PMI value according to the channel estimation, and determines the first PMI value Sending to the base station, so that the base station receives the first PMI value obtained by the cell edge user for channel estimation of the interference source. After the first PMI value is obtained, the processes of S103 and S104 are performed.
  • the base station corresponding to the default interference source is a base station that has the same interference coordination capability as the primary base station corresponding to the cell edge user, but in some cases, the base station corresponding to the interference source may not necessarily have the interference coordination function. Therefore, after receiving the RSRP list fed back by the cell edge user, the resource allocation information of the user may also be sent to the interference source, and whether the interference source has the interference coordination capability is confirmed by whether the received information of the resource allocation information is received.
  • the acknowledgement information of the interference source feedback resource allocation information is not received, it is confirmed that the base station corresponding to the currently confirmed interference source does not have the interference coordination capability, and the next interference source with the strongest interference to the cell edge user is newly determined; In the case where the interference source feedbacks the information of the resource allocation information, it is determined that the interference source has the capability of interference coordination.
  • the embodiment of the present invention further provides a device for coordinating cell edge user interference.
  • the structure of the device is as shown in FIG. 2, and includes: a receiving module 10, configured to receive an RSRP list fed back by a cell edge user, and determine a cell edge user.
  • the interference source with the strongest interference receiving the first PMI value obtained by the cell edge user for channel estimation of the interference source;
  • the determining module 20 is coupled with the receiving module 10, and is configured to determine the interference in the preset codebook according to the first PMI value.
  • the second PMI value that is the most orthogonal to the precoding weight is obtained by the source and the cell edge user.
  • the sending module 30 is coupled to the determining module 20 and configured to send the second PMI value to the interference.
  • the source causes the interference source to perform scheduling of the user according to the second PMI value.
  • FIG. 3 shows a schematic structural diagram of the above-mentioned receiving module 10, which may include a receiving unit 101 and a determining unit 102.
  • the receiving unit 101 is configured to receive an RSRP list fed back by the cell edge user.
  • the receiving module 10 determines that the interference source that has the strongest interference to the cell edge user includes:
  • the determining unit 102 is coupled to the receiving unit 101, and is configured to select a neighboring cell with the largest RSRP value from the RSRP list, and determine the selected neighboring cell as the interference source with the strongest interference to the cell edge user.
  • the sending module is further configured to send, to the cell edge user, an indication for performing channel estimation on the interference source, before the receiving module receives the first PMI value obtained by performing channel estimation on the interference source by the cell edge user.
  • the information is further configured to: after the receiving module receives the reference signal received power RSRP list fed back by the cell edge user, send the resource allocation information of the user to the interference source; and the determining module is further configured to: In the case of receiving information, it is determined that the interference source has the capability of interference coordination.
  • the embodiment of the invention further provides a base station, which comprises the foregoing apparatus for coordinating cell edge user interference.
  • a base station which comprises the foregoing apparatus for coordinating cell edge user interference.
  • the embodiment of the invention provides a method for interference coordination of a cell edge user, which aims to solve the problem of strong interference of edge users through user feedback and interaction between cells.
  • the method provided by the embodiment of the present invention includes the following steps: when the interference is coordinated, the LTE network management system is backed up (mainly responsible for parameter configuration, management, alarm, fault initial diagnosis, and routine maintenance functions of the entire network) to be static, semi-static or dynamic.
  • the form determines a SINR threshold for defining a cell edge user, that is, distinguishes edge users from all users, and subsequent operations are mainly directed to such users.
  • the base station distinguishes the cell edge users by the above method.
  • the interference coordination method is to perform the following operations on such users to minimize co-channel interference between cells.
  • the static configuration in the above process is unchanged after the SINR threshold is set, for example, 0 dB.
  • the semi-static configuration refers to slowly inter-cell user power information, cell load information, resource allocation information, and interference. Information, etc., the cell uses this information to coordinate resource allocation and power allocation to achieve interference coordination purposes.
  • ICIC Inter Cell Interference Coordination
  • E-UTRA Evolved UMTS Land Surface Radio Access
  • Evolved Typical semi-static interference coordination technology in the Universal Terrestrial Radio Access system the letter
  • the period of interest interaction and action is usually tens of milliseconds to hundreds of milliseconds; and dynamic configuration means that the SINR threshold is adjusted in real time with relevant constraints.
  • the base station determines the cell edge users that are subject to strong interference according to the CSI fed back by the edge user and combines the SINR value, and marks the users. Since the interference received by the edge users is not the same, it is necessary to determine the edge users with strong interference through CSI and SINR, and the method of subsequent interference coordination can be effectively implemented.
  • the base station searches for a strong interference source of the user according to the RSRP measurement list fed back by the user of the cell edge.
  • the strong interference source may be a neighboring base station or a cell (Small cell).
  • the RSRP measurement will focus on the same frequency measurement and determine the strongest interference source based on the absolute value of the interference level.
  • the base station sends the resource allocation information of the user to the strong interference source, and can be sent by using a bitmap. After receiving the bitmap information sent by the base station, the strong interference source returns the acknowledgement information to the base station.
  • the base station does not receive the acknowledgment from the corresponding base station within the specified time delay, the interference cooperation fails. If the base station receives the acknowledgment information from the corresponding base station within the specified time delay, the base station sends dynamic or semi-static indication information to the cell edge user, and informs the users that additional strong interference source channel information needs to be measured, for example, the base station is in the PDCCH (physical downlink).
  • the control channel Physical Downlink Control Channel informs the cell edge user that additional pilot signals need to be measured and fed back by the strong interference source.
  • the above process is to confirm the real strong interference source base station.
  • the channel measurement result of the cell edge user period or the aperiodic feedback to the strong interference source may be quantized into PMI information, that is, the channel PMI (weight) value of the interfering source base station to the interfered edge user.
  • Precoding is an adaptive technique in a multi-antenna system, that is, adaptively changing the precoding matrix at the transmitting end according to the CSI of the channel, and changing the signal to experience the channel.
  • a set of codebooks containing multiple precoding matrices is stored at both ends of the transmitting and receiving ends, so that the receiver can select one of the precoding matrices according to the estimated channel matrix and a certain criterion, and index the value and the quantized channel state.
  • the information is fed back to the transmitting end; at the next moment, the transmitting end adopts a new precoding matrix, and determines the encoding and modulation mode for the codeword according to the channel state quantization information fed back.
  • the interference source base station receives the PMI information corresponding to the strong interference signal fed back by the cell edge user, and according to the information, the interference source base station adjusts the precoding scheme for the cell edge user, thereby reducing interference.
  • This embodiment is an inter-cell interference coordination scheme based on broadband information. As shown in FIG. 4, the interference coordination method includes steps S401 to S406.
  • Step S401 Determine a cell edge user of the base station 1 according to a CQI (Channel Quality Indicator, one of parameters of the CSI) and an SINR.
  • CQI Channel Quality Indicator, one of parameters of the CSI
  • the system finds that there are multiple users with high bit error rate in some areas, and the throughput is very low. Then, the inter-cell interference coordination function is enabled through the LTE network management system, and the cell edge user screening is configured in a semi-static manner. Threshold SINR_Threshold, according to the threshold, the base station 1 selects a user whose CINR corresponding to the SINR is lower than the SINR_Threshold from the broadband CQI fed back by the user (that is, one CQI is reported in the entire LTE bandwidth), and the users are determined to be cell edge users, and the base station 1 is set. According to the broadband CQI, user 1 is selected as a cell edge user.
  • Step S402 Determine the base station 2 corresponding to the strongest interference source according to the RSRP list.
  • the base station 1 selects the neighboring cell with the largest RSRP value according to the neighboring cell RSRP list that is recently fed back by the user 1, and the cell is the strongest interfering cell of the user 1, and the cell is assumed to correspond to the base station 2.
  • Step S403 User 1 performs channel estimation on the interference source to obtain a PMI2 value.
  • the base station 1 transmits the 3-bit strong interfering cell ID indication information to the user 1 in the subsequent PDCCH channel.
  • the strong interfering cell of the user 1 is the base station 2, and the strong interfering cell ID indication is “010”, and the user 1 passes the blind
  • the strong interfering cell ID indication is read, and then the base station 2 performs channel estimation on its own channel according to the indication, and obtains a matching PMI value according to the channel estimation result, that is, PMI2.
  • Step S404 User 1 feeds back the PMI2 value to the base station 1.
  • the user 1 additionally feeds back the broadband PMI2 of the strong interfering cell (base station 2) in addition to the broadband CQI1/PMI1/RI1 (Rank Indication) of the serving cell (base station 1).
  • the bit string corresponding to PMI2 can be placed after PMI1. That is, the original user 1 only needs to feed back 2 bits of PMI information, and now needs to feed back 4-bit PMI information, where the first 2 bits are PMI1, corresponding to user 1 to base station 1 PMI, and last 2 The bit is PMI2, corresponding to the PMI of User 1 to Base Station 2.
  • Step S405 PMI3 is determined by PMI2.
  • the base station 1 After receiving the feedback information of the user 1, the base station 1 learns the precoding weight that best matches the channel of the base station 2 to the user 1 by reading the PMI2, and the base station 1 selects the most orthogonality from the codebook. For strong PMI3, PMI3 is used as the precoding weight index recommended by base station 1 to base station 2.
  • Step S406 The base station 1 recommends the PMI 3 to the base station 2 for interference coordination.
  • the base station 2 Before the base station 1 determines that the user 1 is to be scheduled, the base station 2 transmits 2-bit recommended precoding information, that is, PMI3, through the X2 interface, and if the base station 2 also enables the inter-cell interference coordination function, the base station 2 receives the received from the base station 1. After the recommended precoding index is sent, it is understood that the base station 1 wishes to use the precoding weight that is strongly correlated with the recommended precoding index. When the base station 2 schedules the user, the base station 2 can select the user whose feedback PMI is close to PMI3 as much as possible. Scheduling.
  • the SINR value of each edge user can be compared to determine the PMI value to be used preferentially, that is, when the base station 1 sends the recommended PMI3 to the base station 2, the cell edge user is simultaneously sent.
  • the SINR weight is used to help the base station 2 determine the priority. If the edge user ends the current access, the base station 1 notifies the base station 2 that the base station 2 lowers the priority of the PMI 3 use. This interference coordination ends.
  • the interference coordination between the base station 1 and the base station 2 is realized, the interference of the user 1 is greatly reduced, and the bit error rate is effectively reduced, thereby improving the throughput and improving the user experience.
  • This embodiment is an inter-cell interference coordination scheme based on sub-band information. As shown in flowchart 5, the interference coordination method includes steps S501 to S506.
  • Step S501 The base station 1 selects the user 1 as a cell edge user on the subband [1, 2] according to the subband CQI.
  • the system finds that there are multiple users with high bit error rate in some areas, and the throughput is very low. Then, the inter-cell interference coordination function is enabled through the LTE network management system, and the frequency selection cell edge is configured in a semi-static manner.
  • the user screening threshold SINR_Threshold according to the threshold, the base station 1 sub-band CQI fed back from the user (that is, the entire LTE bandwidth is divided into multiple sub-bands, that is, multiple small bandwidths, and one CQI is reported on each small bandwidth, so-called frequency selective CQI
  • the user whose SINR corresponding to the CQI is lower than the SINR_Threshold is selected, and which sub-bands of these users are marked as SINR
  • these users are determined to be frequency selective cell edge users on the corresponding subband, and the base station 1 is selected according to the subband CQI to select that the user 1 is a cell edge user on the subband [1, 2].
  • Step S502 Determine the base station 2 corresponding to the strongest interference source according to the RSRP list.
  • the base station 1 selects the neighboring cell with the largest RSRP value according to the neighboring cell RSRP list that is recently fed back by the user 1, and the cell is the strongest interfering cell of the user 1, and the cell is assumed to correspond to the base station 2.
  • Step S503 The user 1 performs channel estimation on the interference source base station 2, and obtains PMI2_1 of the corresponding subband 1 and PMI2_2 of the subband 2.
  • the base station 1 transmits the 3-bit strong interfering cell ID indication information to the user 1 in the subsequent PDCCH channel.
  • the strong interfering cell of the user 1 is the base station 2, and the strong interfering cell ID indication is “010”, and the base station 1 also
  • the sub-band bitmap is sent to the user 1 to indicate on which sub-bands the user 1 needs to measure the strong interfering cell channel. If the system is 10 MHz bandwidth, corresponding to 8 sub-bands, the base station 1 sends “11000000” to the user 1, indicating User 1 receives strong interference on subbands 1, 2.
  • the user 1 After blindly detecting and demodulating the PDCCH channel, the user 1 reads the strong interfering cell ID indication and the strong interfering subband indication, and then performs channel estimation on the base station 2 to its own channel according to the indications, and obtains a match according to the channel estimation result.
  • the PMI value corresponding to subband 1 and subband 2 are PMI2_1 and PMI2_2, respectively.
  • Step S504 The user feeds back PMI2_1 and PMI2_2 to the base station 1.
  • User 1 additionally feeds itself to the PMI 2_1 and PMI 2_2 of the sub-band 1 and sub-band 2 of the strong interfering cell (base station 2) in addition to the broadband CQI1/PMI1/RI1 of the serving cell (base station 1).
  • the bit string corresponding to PMI2_1 and PMI2_2 can be placed after PMI1. That is, the original user 1 only needs to feed back 2 bits of PMI information, and now needs to feed back 6-bit PMI information, wherein the first 2 bits are PMI1, corresponding to the PMI of user 1 to base station 1.
  • the last 4 bits are PMI2_1 and PMI2_2PMI2, respectively, corresponding to the PMI of user 1 to base station 2 on subband 1, subband 2.
  • Step S505 The base station 1 selects PMI3_1 and PMI3_2 which have the strongest orthogonality with PMI2_1 and PMI2_2.
  • the base station 1 After receiving the feedback information of the user 1, the base station 1 reads the PMI 2_1 and the PMI 2_2, and learns the precoding weight that matches the channel of the base station 2 to the user 1 on the subband 1 and the subband 2, and the base station 1 receives the code.
  • the precoding weight index on the subband 1 and the subband 2 recommended by the PMI 3_1 and the PMI 3_2 base station 1 to the base station 2 is used.
  • Step S506 The base station 1 recommends PMI3_1 and PMI3_2 to the base station 2 for interference coordination.
  • the base station 1 determines that the user 1 is to be scheduled on the subband 1, and then transmits 2 bits of recommended precoding information, that is, PMI3_1, to the base station 2 through the X2 interface, and indicates the corresponding subband 1, if the base station 1 determines that it is to be on the subband 2. If the user 1 is scheduled, the 2-bit PMI 3_2 is transmitted to the base station 2 through the X2 interface, and the corresponding sub-band 2 is indicated. If the base station 2 also enables the inter-cell interference coordination function, the base station 2 receives the recommended pre-sent from the base station 1.
  • PMI3_1 recommended precoding information
  • the base station 1 After encoding the index, it is understood that the base station 1 wishes to use the precoding weight strongly correlated with the recommended precoding index, and the base station 2 can select the feedback PMI on the corresponding subband as close as possible to PMI3_1 or PMI3_2 when scheduling the user. Users to schedule. If the base station 2 receives the precoding index recommended by multiple base stations in the vicinity, the SINR value of each edge user can be compared to determine the PMI value to be used preferentially, that is, when the base station 1 sends the recommended PMI3_1 or PMI3_2 to the base station 2, the base station 1 simultaneously sends the recommended PMI3_1 or PMI3_2. The SINR weight of the cell edge user to help the base station 2 determine the priority. If the edge user ends the current access, the base station 1 notifies the base station 2 that the base station 2 lowers the priority used by the PMI 3_1 or PMI 3_2. This interference coordination ends.
  • the interference coordination between the base station 1 and the base station 2 is realized, the interference of the user 1 is greatly reduced, and the bit error rate is effectively reduced, thereby improving the throughput and improving the user experience.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the method of coordinating cell edge user interference.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the embodiment of the present invention utilizes the feedback information of the user, that is, determines the interference source with the strongest interference of the cell edge user according to the RSRP list, and then determines the first PMI value of the interference source and the user of the cell edge, and then uses the principle of interference to determine and
  • the first PMI value corresponds to the second PMI value with the strongest orthogonality of the precoding weight
  • the interference source is used for user scheduling by using the second PMI value, and the user experience is high
  • the method is used by the user feedback and between the cells.

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Abstract

本申请公开了一种协调小区边缘用户干扰的方法、装置及基站，该方法包括：接收小区边缘用户反馈的RSRP列表，确定对小区边缘用户干扰最强的干扰源；接收小区边缘用户对干扰源进行信道估计得到的第一PMI值；根据第一PMI值，在预设码本中确定干扰源与小区边缘用户最匹配的预编码权值，得到与预编码权值正交性最强的第二PMI值；将第二PMI值发送至干扰源，令干扰源根据第二PMI值进行用户的调度。

Description

一种协调小区边缘用户干扰的方法、装置及基站 技术领域
本申请涉及但不限于通讯领域，尤其涉及一种协调小区边缘用户干扰的方法、装置及基站。
背景技术
随着移动通信技术的不断发展，用户对移动通信的内容和质量都提出了更高的要求，包括通信设备的微型化、低功耗、宽带接入以及丰富的多媒体业务。为了可选地提升相关3G(第三代移动通信技术，3rd-Generation)网络的性能，3GPP(第三代合作伙伴计划，3rd Generation Partnership Project)提出了3G的LTE(长期演进，Long Term Evolution)。
LTE采用OFDM(正交频分多址接入，Orthogonal Frequency Divided Multiple Access)，OFDM技术利用频率之间的正交性作为区分用户的方式，将用户的信息承载在相互正交的不同的载波上，可以有效的对抗频率选择性衰落。另外，由于小区内用户使用的频率相互正交，所有的干扰全部来自于其他小区，也可以大大提高小区中心用户的SINR(信号与干扰加噪声比，Signal to Interference plus Noise Ratio)，从而可以提供更高的数据速率和更好的服务质量。
而对于小区边缘用户(无线信号覆盖的区域称之为小区，一般是指一个基站的信号所能覆盖的范围，小区边缘一般都是覆盖差的地方，该范围内的用户称之为小区边缘用户)，由于相邻小区占用同样载波资源的用户对其干扰比较大，加之本身距离基站较远，其SINR相对就较小，导致虽然整个小区的吞吐量较高、但小区边缘用户服务质量较差、吞吐量较低的情况。
为了解决这个LTE系统在小区边缘干扰严重的问题，3GPP提出了多种解决方案，包括干扰随机化、干扰删除以及干扰协调技术。其中，干扰随机化利用干扰的统计特性对干扰进行抑制，误差较大；干扰删除技术可以显著改善小区边缘的系统性能，获得较高的频谱效率，但是对于带宽较小的业务(如VoIP)则不太适用，在OFDM系统中实现也比较复杂，后续对它的研 究不多；干扰协调/避免则是目前研究的一项热门技术，其实现简单，可以应用于多种带宽的业务，并且对于干扰抑制有很好的效果。
目前，对于下行信道中的干扰协调技术，在相关技术领域中是一个热点。但是大都局限于功率控制、资源块调度等手段，而这些手段都对传输性能有一定负面影响。例如，增加边缘用户的RB(资源块，Resource Block)数，无疑会减少中心用户的可用RB数，也就降低了中心用户的吞吐量(系统负荷较高时)，小区总吞吐量随之降低；提高边缘用户SINR的手段是本小区边缘用户与干扰邻区中心用户使用相同位置的RB资源，通过降低干扰邻区中心RB资源的发射功率(负荷较高时)，或者不发射(负荷较低时)，来降低邻区干扰。然而，降低干扰邻区中心RB资源的发射功率，很容易造成干扰邻区中心用户的SINR，从而降低中心用户和小区总吞吐量。
综上所述，相关技术中在LTE系统内存在小区边缘干扰严重的问题，但相关干扰协调方式都会不同程度的影响系统的整体性能，无法解决小区边缘用户的干扰问题，用户体验较差。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供了一种协调小区边缘用户干扰的方法、装置及基站，解决了相关技术中存在的在LTE系统内存在小区边缘干扰严重的问题，但相关干扰协调方式都会不同程度的影响系统的整体性能，无法解决小区边缘用户的干扰问题，用户体验较差的问题。
一种协调小区边缘用户干扰的方法，包括：接收小区边缘用户反馈的RSRP(参考信号接收功率，(Reference Signal Receiving Power)列表，确定对所述小区边缘用户干扰最强的干扰源；接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI(预编码矩阵指示，Precoding Matrix Indicator)值；根据所述第一PMI值，在预设码本中确定所述干扰源与所述小区边缘用户最匹配的预编码权值，得到与所述预编码权值正交性最强的第二PMI值；将所述第二PMI值发送至所述干扰源，令所述干扰源根据所述第二PMI值进 行用户的调度。
可选地，所述确定对所述小区边缘用户干扰最强的干扰源包括：从所述RSRP列表中选择RSRP值最大的邻小区，并将选择出的所述邻小区确定为对所述小区边缘用户干扰最强的干扰源。
可选地，所述方法还包括：在接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI值之前，向所述小区边缘用户发送对所述干扰源进行信道估计的指示信息。
可选地，所述方法还包括：在向所述小区边缘用户发送对所述干扰源进行信道估计的指示信息之后，所述小区边缘用户解析所述信道估计的指示信息，得到所述干扰源的地址信息；根据所述地址信息读取所述干扰源，进行与所述干扰源的信道估计；根据所述信道估计确定所述第一PMI值。
可选地，所述方法还包括：在接收小区边缘用户反馈的参考信号接收功率RSRP列表之后，向所述干扰源发送用户的资源分配信息；在接收到所述干扰源反馈所述资源分配信息的确收信息的情况下，确定所述干扰源具备干扰协调能力。
一种协调小区边缘用户干扰的装置包括：接收模块、确定模块和发送模块。
接收模块，设置为接收小区边缘用户反馈的参考信号接收功率RSRP列表，确定对所述小区边缘用户干扰最强的干扰源；接收模块，还设置为接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI值；确定模块，设置为根据所述第一PMI值，在预设码本中确定所述干扰源与所述小区边缘用户最匹配的预编码权值，得到与所述预编码权值正交性最强的第二PMI值；发送模块，设置为将所述第二PMI值发送至所述干扰源，令所述干扰源根据所述第二PMI值进行用户的调度。
可选地，所述接收模块包括：接收单元和确定单元。
接收单元，设置为接收所述小区边缘用户反馈的所述RSRP列表。
所述接收模块确定对所述小区边缘用户干扰最强的干扰源包括：
确定单元，设置为从所述RSRP列表中选择RSRP值最大的邻小区，并 将选择出的所述邻小区确定为对所述小区边缘用户干扰最强的干扰源。
可选地，所述发送模块，还设置为在所述接收模块接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI值之前，向所述小区边缘用户发送对所述干扰源进行信道估计的指示信息。
可选地，所述发送模块，还设置为在所述接收模块接收小区边缘用户反馈的参考信号接收功率RSRP列表之后，向所述干扰源发送用户的资源分配信息；所述确定模块，还设置为在接收到所述干扰源反馈所述资源分配信息的确收信息的情况下，确定所述干扰源具备干扰协调能力。
一种基站，包括：所述的协调小区边缘用户干扰的装置。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现所述的协调小区边缘用户干扰的方法。
本发明实施例利用了用户的反馈信息，即根据RSRP列表来确定小区边缘用户干扰最强的干扰源，随后确定该干扰源与小区边缘用户的第一PMI值，再利用干扰的原理，确定与第一PMI值对应预编码权值正交性最强的第二PMI值，并使干扰源通过该第二PMI值来进行用户调度，用户体验较高，该方法通过用户的反馈以及小区之间的交互，解决了相关技术中存在的在LTE系统内存在小区边缘干扰严重的问题，但相关干扰协调方式都会不同程度的影响系统的整体性能，无法解决小区边缘用户的干扰问题，用户体验较差的问题。
附图概述
图1是本发明实施例中协调小区边缘用户干扰的方法的流程图；
图2是本发明实施例中协调小区边缘用户干扰的装置的结构示意图；
图3是本发明实施例中协调小区边缘用户干扰的装置接收模块的结构示意图；
图4是本发明可选实施例中实例一的干扰协调方法的流程图；
图5是本发明可选实施例中实例二的干扰协调方法的流程图。
本发明的实施方式
为了解决相关技术中存在的在LTE系统内存在小区边缘干扰严重的问题，但相关干扰协调方式都会不同程度的影响系统的整体性能，无法解决小区边缘用户的干扰问题，用户体验较差的问题，本发明实施例提供了一种协调小区边缘用户干扰的方法、装置及基站，以下结合附图以及实施例，对本发明实施例进行详细说明。应当理解，此处所描述的实施例仅仅用以解释本发明实施例，并不限定本发明实施例。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
本发明实施例提供了一种协调小区边缘用户干扰的方法，该方法的流程如图1所示，包括步骤S101至S104：
S101，接收小区边缘用户反馈的RSRP列表，确定对小区边缘用户干扰最强的干扰源。
S102，接收小区边缘用户对干扰源进行信道估计得到的第一PMI值。
S103，根据第一PMI值，在预设码本中确定干扰源与小区边缘用户最匹配的预编码权值，得到与预编码权值正交性最强的第二PMI值。
S104，将第二PMI值发送至干扰源，令干扰源根据第二PMI值进行用户的调度。
本发明实施例利用了用户的反馈信息，即根据RSRP列表来确定小区边缘用户干扰最强的干扰源，随后确定该干扰源与小区边缘用户的第一PMI值，再利用干扰的原理，确定与第一PMI值对应预编码权值正交性最强的第二PMI值，并使干扰源通过该第二PMI值来进行用户调度，用户体验较高，该方法通过用户的反馈以及小区之间的交互，解决了相关技术中存在的在LTE系统内存在小区边缘干扰严重的问题，但相关干扰协调方式都会不同程度的影响系统的整体性能，无法解决小区边缘用户的干扰问题，用户体验较差的问题。
在S101实现之前，基站需要接收每个边缘用户反馈的CSI(信道状态信息，Channel State Information)和SINR值；根据CSI和SINR值确定需要协调干扰的小区边缘用户群，在确定了小区边缘用户群之后，就针对该小区边缘用户群中的小区边缘用户进行监测和干扰协调。
在S101实现的过程中，先接收小区边缘用户反馈的RSRP列表，再从RSRP列表中选择RSRP值最大的邻小区，并确定邻小区为对小区边缘用户干扰最强的干扰源。
随后，基站向小区边缘用户发送对干扰源进行信道估计的指示信息。小区边缘用户解析信道估计的指示信息，以得到干扰源的地址信息；根据地址信息读取干扰源，以进行与干扰源的信道估计；根据信道估计确定第一PMI值，并将第一PMI值发送至基站，以使得基站接收小区边缘用户对干扰源进行信道估计得到的第一PMI值。在得到第一PMI值之后，执行S103及S104的过程。
在上述过程实现中，默认干扰源对应的基站是与小区边缘用户对应的主基站同样具备干扰协调能力的基站，但在某些情况下，可能干扰源对应的基站并不一定具备干扰协调功能，因此，在接收小区边缘用户反馈的RSRP列表之后，还可以向干扰源发送用户的资源分配信息，通过是否收到资源分配信息的确收信息来确认干扰源是否具备干扰协调能力。在没有接收到干扰源反馈资源分配信息的确收信息的情况下，确认当前确认的干扰源对应的基站不具备干扰协调能力，重新确定下一个对小区边缘用户干扰最强的干扰源；在接收到干扰源反馈资源分配信息的确收信息的情况下，确定干扰源具备干扰协调能力。
本发明实施例还提供了一种协调小区边缘用户干扰的装置，该装置的结构示意如图2所示，包括：接收模块10，设置为接收小区边缘用户反馈的RSRP列表，确定对小区边缘用户干扰最强的干扰源；接收小区边缘用户对干扰源进行信道估计得到的第一PMI值；确定模块20，与接收模块10耦合，设置为根据第一PMI值，在预设码本中确定干扰源与小区边缘用户最匹配的预编码权值，得到与预编码权值正交性最强的第二PMI值；发送模块30，与确定模块20耦合，设置为将第二PMI值发送至干扰源，令干扰源根据第二PMI值进行用户的调度。
图3示出了上述接收模块10的结构示意图，其可以包括：接收单元101和确定单元102。
接收单元101，设置为接收小区边缘用户反馈的RSRP列表。
所述接收模块10确定对所述小区边缘用户干扰最强的干扰源包括：
确定单元102，与接收单元101耦合，设置为从RSRP列表中选择RSRP值最大的邻小区，并将选择出的邻小区确定为对小区边缘用户干扰最强的干扰源。
实现过程中，发送模块，还设置为在所述接收模块接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI值之前，向小区边缘用户发送对干扰源进行信道估计的指示信息；还设置为在所述接收模块接收小区边缘用户反馈的参考信号接收功率RSRP列表之后，向干扰源发送用户的资源分配信息；确定模块，还设置为在接收到干扰源反馈资源分配信息的确收信息的情况下，确定干扰源具备干扰协调能力。
本发明实施例还提供了一种基站，其包括上述的协调小区边缘用户干扰的装置。本领域技术人员根据上述记载，知晓如何将上述的协调小区边缘用户干扰的装置集成设置在基站中，此处不再赘述。
可选实施例
本发明实施例提供了一种小区边缘用户的干扰协调方法，目的在于通过用户的反馈以及小区之间的交互，解决了边缘用户的强干扰问题。本发明实施例提供的方法如下，包括：协调干扰时，通过LTE网络管理系统后台(主要负责全网的参数配置，管理，告警，故障初步诊断以及日常维护等功能)以静态、半静态或动态形式确定一个用于界定小区边缘用户的SINR门限值，即从所有用户中将边缘用户区分开，后续操作主要针对此类用户。
基站用上述方法区分小区边缘用户，此干扰协调方法就是对此类用户进行下述操作，以尽可能降低小区间的同频干扰。
其中，上述过程中的静态配置指对于SINR门限值设定后保持不变，例如0dB；半静态配置指为小区间慢速地交互小区内用户功率信息、小区负载信息、资源分配信息、干扰信息等，小区利用这些信息，协调资源分配和功率分配，达到干扰协调的目的，例如，ICIC(小区间干扰协调，Inter Cell Interference Coordination)为E-UTRA(演进的UMTS陆面无线接入，Evolved Universal Terrestrial Radio Access)系统中典型的半静态干扰协调技术，其信 息交互和动作的周期通常为几十毫秒到几百毫秒；而动态配置是指SINR门限值随相关约束条件实时调整。
基站根据边缘用户反馈的CSI，并结合SINR值，确定受到干扰较强的小区边缘用户，并且标记这些用户。由于边缘用户收到的干扰并不相同，所以需要通过CSI、SINR来确定收到干扰较强的边缘用户，后续干扰协调的方法才能够有效实施。
基站根据小区边缘用户反馈的RSRP测量列表，寻找用户的强干扰源，强干扰源可能是相邻基站，或者小区(Small cell)。此时RSRP测量将关注同频测量，根据干扰电平的绝对值确定最强干扰源。
基站给强干扰源发送用户的资源分配信息，可以用bitmap方式发送；强干扰源收到上述基站发出的bitmap信息后，给基站返回确认信息。
如果基站在规定时延内没有收到来自相应基站的确认信息，则此次干扰协作失败。如果基站在规定时延内收到来自相应基站的确认信息，则基站给小区边缘用户发送动态或半静态指示信息，通知这些用户需要额外测量强干扰源信道信息，例如，基站在PDCCH(物理下行控制信道，Physical Downlink Control Channel)里通知小区边缘用户需要额外测量并反馈强干扰源的导频信号。总之，上述过程就是为了确认真正强干扰源基站。
小区边缘用户周期或非周期性反馈对强干扰源的信道测量结果，可以量化为PMI信息，即干扰源基站到被干扰边缘用户的信道PMI(权)值。预编码是多天线系统中的一种自适应技术，即根据信道的CSI，在发射端自适应的改变预编码矩阵，起到改变信号经历信道的作用。在收发两端均存储一套包含多个预编码矩阵的码书，这样接收机可以根据估计出的信道矩阵和某一准则选择其中一个预编码矩阵，并将其索引值和量化后的信道状态信息反馈给发送端；在下一个时刻，发送端采用新的预编码矩阵，并根据反馈回的信道状态量化信息为码字确定编码和调制方式。
干扰源基站收到小区边缘用户反馈的来自强干扰信号对应的PMI信息，根据这些信息，干扰源基站调整对小区边缘用户的预编码方案，从而降低干扰。
下面结合附图和实例对上述方法进行说明。
实例一
本实施例为基于宽带信息的小区间干扰协调方案，其流程图4所示，该干扰协调方法包括步骤S401至步骤S406。
步骤S401：根据CQI(信道质量指示，Channel Quality Indicator，CSI的参数之一)和SINR确定基站1的小区边缘用户。
系统经过一段时间统计，发现某些区域内存在多个用户误码率较高，并且吞吐量很低，则通过LTE网络管理系统使能小区间干扰协调功能，以半静态方式配置小区边缘用户筛选门限SINR_Threshold，根据此门限，基站1从用户反馈的宽带CQI(即整个LTE带宽上报一个CQI)中，挑选CQI对应的SINR低于SINR_Threshold的用户，则这些用户即判定为小区边缘用户，设基站1根据宽带CQI筛选出来用户1为小区边缘用户。
步骤S402：根据RSRP列表确定最强干扰源对应的基站2。
基站1根据用户1最近反馈的邻小区RSRP列表，从中选出RSRP值最大的邻小区，则该小区即为用户1的最强干扰小区，假设该小区对应基站2。
步骤S403：用户1对干扰源进行信道估计，得到PMI2值。
基站1在随后的PDCCH信道中，给用户1发送3比特的强干扰小区ID指示信息，本次用户1的强干扰小区为基站2，则强干扰小区ID指示为“010”，用户1通过盲检并解调出PDCCH信道后，读取强干扰小区ID指示，然后根据该指示，对基站2到自己的信道进行信道估计，并根据信道估计结果得到匹配的PMI值，即为PMI2。
步骤S404：用户1反馈PMI2值给基站1。
用户1在随后的CSI反馈中，除了反馈自己到服务小区(基站1)的宽带CQI1/PMI1/RI1(Rank Indication，秩指示)外，额外反馈自己到强干扰小区(基站2)的宽带PMI2，PMI2对应的比特串可以放在PMI1后面，即原本用户1只要反馈2比特的PMI信息，现在要反馈4比特的PMI信息，其中前2比特为PMI1，对应用户1到基站1的PMI，后2比特为PMI2，对应用户1到基站2的PMI。
步骤S405：通过PMI2确定PMI3。
基站1收到用户1的反馈信息后，通过读取PMI2，则了解了与基站2到用户1的信道最匹配的预编码权值，基站1从码本中选择与该权值正交性最强的PMI3，则把PMI3作为基站1向基站2推荐的预编码权值索引。
步骤S406：基站1将PMI3推荐给基站2，以进行干扰协调。
在基站1确定要调度用户1之前，通过X2接口，给基站2发送2比特的推荐预编码信息，即PMI3，如果基站2也使能了小区间干扰协调功能，则基站2收到来自基站1发送的推荐预编码索引后，就了解了基站1希望自己使用与推荐预编码索引强相关的预编码权值，那么基站2在调度用户时，可以尽可能选择反馈PMI与PMI3比较接近的用户来调度。如果基站2同时收到附近多个基站推荐的预编码索引，则可以通过各个边缘用户SINR值比较，以确定优先使用的PMI值，即基站1向基站2发送推荐PMI3时，同时发送小区边缘用户的SINR权值，以帮助基站2确定优先级。如果边缘用户结束本次接入，则基站1通知基站2，基站2降低PMI3使用的优先级。本此干扰协调结束。
通过上述过程，实现了基站1与基站2之间的干扰协调，用户1的干扰大大减小，误码率会被有效降低，从而提高了吞吐量，改善用户体验。
实例二
本实施例为基于子带信息的小区间干扰协调方案，其流程图5所示，该干扰协调方法包括步骤S501至步骤S506。
步骤S501：基站1根据子带CQI筛选出来用户1在子带[1、2]上为小区边缘用户。
系统经过一段时间统计，发现某些区域内存在多个用户误码率较高，并且吞吐量很低，则通过LTE网络管理系统使能小区间干扰协调功能，以半静态方式配置频选小区边缘用户筛选门限SINR_Threshold，根据此门限，基站1从用户反馈的子带CQI(即将整个LTE带宽分为多个子带，也就是多个小带宽，每个小带宽上上报一个CQI，所谓频率选择性CQI)中，挑选CQI对应的SINR低于SINR_Threshold的用户，并且标记这些用户哪些子带为SINR 较差子带，则这些用户在对应子带上被判定为频选小区边缘用户，设基站1根据子带CQI筛选出来用户1在子带[1、2]上为小区边缘用户。
步骤S502：根据RSRP列表确定最强干扰源对应的基站2。
基站1根据用户1最近反馈的邻小区RSRP列表，从中选出RSRP值最大的邻小区，则该小区即为用户1的最强干扰小区，假设该小区对应基站2。
步骤S503：用户1对干扰源基站2进行信道估计，得到对应子带1的PMI2_1和子带2的PMI2_2。
基站1在随后的PDCCH信道中，给用户1发送3比特的强干扰小区ID指示信息，本次用户1的强干扰小区为基站2，则强干扰小区ID指示为“010”，同时基站1还要给用户1发送子带bitmap，用于指示用户1需要在哪些子带上测量强干扰小区信道，若系统为10MHz带宽，对应8个子带，则基站1要给用户1发送“11000000”,指示用户1在子带1、2上收到强干扰。用户1通过盲检并解调出PDCCH信道后，读取强干扰小区ID指示以及强干扰子带指示，然后根据这些指示，对基站2到自己的信道进行信道估计，并根据信道估计结果得到匹配的PMI值，对应子带1和子带2分别为PMI2_1、PMI2_2。
步骤S504：用户将PMI2_1和PMI2_2反馈给基站1。
用户1在随后的CSI反馈中，除了反馈自己到服务小区(基站1)的宽带CQI1/PMI1/RI1外，额外反馈自己到强干扰小区(基站2)对应子带1和子带2的PMI2_1、PMI2_2，PMI2_1、PMI2_2对应的比特串可以放在PMI1后面，即原本用户1只要反馈2比特的PMI信息，现在要反馈6比特的PMI信息，其中前2比特为PMI1，对应用户1到基站1的PMI，后4比特分别为PMI2_1、PMI2_2PMI2，对应用户1到基站2在子带1、子带2上的PMI。
步骤S505：基站1选择与PMI2_1、PMI2_2正交性最强的PMI3_1、PMI3_2。
基站1收到用户1的反馈信息后，通过读取PMI2_1、PMI2_2，则了解了与基站2到用户1在子带1、子带2上的信道最匹配的预编码权值，基站1从码本中，则把作为PMI3_1、PMI3_2基站1向基站2推荐的子带1、子带2上的预编码权值索引。
步骤S506：基站1将PMI3_1、PMI3_2推荐给基站2，以进行干扰协调。
基站1确定要在子带1上调度用户1，则通过X2接口，给基站2发送2比特的推荐预编码信息，即PMI3_1，并且指示对应子带1，如果基站1确定要在子带2上调度用户1，则通过X2接口，给基站2发送2比特的PMI3_2，并且指示对应子带2，如果基站2也使能了小区间干扰协调功能，则基站2收到来自基站1发送的推荐预编码索引后，就了解了基站1希望自己使用与推荐预编码索引强相关的预编码权值，那么基站2在调度用户时，可以尽可能在对应子带上选择反馈PMI与PMI3_1或PMI3_2比较接近的用户来调度。如果基站2同时收到附近多个基站推荐的预编码索引，则可以通过每个边缘用户SINR值比较，以确定优先使用的PMI值，即基站1向基站2发送推荐PMI3_1或PMI3_2时，同时发送小区边缘用户的SINR权值，以帮助基站2确定优先级。如果边缘用户结束本次接入，则基站1通知基站2，基站2降低PMI3_1或PMI3_2使用的优先级。本此干扰协调结束。
通过上述过程，实现了基站1与基站2之间的干扰协调，用户1的干扰大大减小，误码率会被有效降低，从而提高了吞吐量，改善用户体验。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现所述的协调小区边缘用户干扰的方法。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一个计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。
上述实施例中的装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。 上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
工业实用性
本发明实施例利用了用户的反馈信息，即根据RSRP列表来确定小区边缘用户干扰最强的干扰源，随后确定该干扰源与小区边缘用户的第一PMI值，再利用干扰的原理，确定与第一PMI值对应预编码权值正交性最强的第二PMI值，并使干扰源通过该第二PMI值来进行用户调度，用户体验较高，该方法通过用户的反馈以及小区之间的交互，解决了相关技术中存在的在LTE系统内存在小区边缘干扰严重的问题，但相关干扰协调方式都会不同程度的影响系统的整体性能，无法解决小区边缘用户的干扰问题，用户体验较差的问题。

Claims (11)

  1. 一种协调小区边缘用户干扰的方法，包括：
    接收小区边缘用户反馈的参考信号接收功率RSRP列表，确定对所述小区边缘用户干扰最强的干扰源；
    接收所述小区边缘用户对所述干扰源进行信道估计得到的第一预编码矩阵指示PMI值；
    根据所述第一PMI值，在预设码本中确定所述干扰源与所述小区边缘用户最匹配的预编码权值，得到与所述预编码权值正交性最强的第二PMI值；
    将所述第二PMI值发送至所述干扰源，令所述干扰源根据所述第二PMI值进行用户的调度。
  2. 如权利要求1所述的协调小区边缘用户干扰的方法，其中，所述确定对所述小区边缘用户干扰最强的干扰源包括：
    从所述RSRP列表中选择RSRP值最大的邻小区，并将选择出的所述邻小区确定为对所述小区边缘用户干扰最强的干扰源。
  3. 如权利要求1所述的协调小区边缘用户干扰的方法，所述方法还包括：在接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI值之前，向所述小区边缘用户发送对所述干扰源进行信道估计的指示信息。
  4. 如权利要求3所述的协调小区边缘用户干扰的方法，所述方法还包括：
    在向所述小区边缘用户发送对所述干扰源进行信道估计的指示信息之后，所述小区边缘用户解析所述信道估计的指示信息，得到所述干扰源的地址信息；
    根据所述地址信息读取所述干扰源，进行与所述干扰源的信道估计；
    根据所述信道估计确定所述第一PMI值。
  5. 如权利要求1至4中任一项所述的协调小区边缘用户干扰的方法，所述方法还包括：在接收小区边缘用户反馈的参考信号接收功率RSRP列表之后，向所述干扰源发送用户的资源分配信息；
    在接收到所述干扰源反馈所述资源分配信息的确收信息的情况下，确定 所述干扰源具备干扰协调能力。
  6. 一种协调小区边缘用户干扰的装置，包括：接收模块、确定模块和发送模块；
    所述接收模块，设置为接收小区边缘用户反馈的参考信号接收功率RSRP列表，确定对所述小区边缘用户干扰最强的干扰源；
    所述接收模块，还设置为接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI值；
    所述确定模块，设置为根据所述第一PMI值，在预设码本中确定所述干扰源与所述小区边缘用户最匹配的预编码权值，得到与所述预编码权值正交性最强的第二PMI值；
    所述发送模块，设置为将所述第二PMI值发送至所述干扰源，令所述干扰源根据所述第二PMI值进行用户的调度。
  7. 如权利要求6所述的协调小区边缘用户干扰的装置，其中，所述接收模块包括：确定单元；
    所述接收模块确定对所述小区边缘用户干扰最强的干扰源包括：
    所述确定单元，设置为从所述RSRP列表中选择RSRP值最大的邻小区，并将选择出的所述邻小区确定为对所述小区边缘用户干扰最强的干扰源。
  8. 如权利要求6所述的协调小区边缘用户干扰的装置，
    所述发送模块，还设置为在所述接收模块接收所述小区边缘用户对所述干扰源进行信道估计得到的第一PMI值之前，向所述小区边缘用户发送对所述干扰源进行信道估计的指示信息。
  9. 如权利要求6至8中任一项所述的协调小区边缘用户干扰的装置，
    所述发送模块，还设置为在所述接收模块接收小区边缘用户反馈的参考信号接收功率RSRP列表之后，向所述干扰源发送用户的资源分配信息；
    所述确定模块，还设置为在接收到所述干扰源反馈所述资源分配信息的确收信息的情况下，确定所述干扰源具备干扰协调能力。
  10. 一种基站，包括：权利要求6至9中任一项所述的协调小区边缘用 户干扰的装置。
  11. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现如权利要求1-5任意一项所述的协调小区边缘用户干扰的方法。
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