WO2014019381A1 - 一种用户调度方法、主基站、用户设备及异构网络 - Google Patents
一种用户调度方法、主基站、用户设备及异构网络 Download PDFInfo
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- 238000013139 quantization Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
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- 230000003595 spectral effect Effects 0.000 description 7
- 238000013468 resource allocation Methods 0.000 description 5
- 230000008713 feedback mechanism Effects 0.000 description 4
- 238000007726 management method Methods 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
Definitions
- the present invention belongs to the field of communications technologies, and in particular, to a user scheduling method, a primary base station, a user equipment, and a heterogeneous network. Background technique
- LTE R8 protocol and its subsequent versions define basic feedback modes to optimize transmission efficiency, especially for downlink transmission, according to frequency selection characteristics in Radio Resource Management (RRM) entities.
- Scheduling includes modulation and coding scheme (MCS) selection, multiple-input multiple-output (MIMO) mode selection, user selection, and the like.
- MCS modulation and coding scheme
- MIMO multiple-input multiple-output
- user selection and the like.
- HetNet since the interference comes from multiple interference sources such as its own macro cell, neighboring macro cell, and other micro cells, the interference itself cannot be considered as Gaussian white noise, so it needs to be improved.
- the feedback mechanism tries to make the interference only include the interference information from the macro cell, which can effectively improve the performance of the micro cell.
- FIG 1 shows the Signal to Interference plus Noise Ratio (SINR) distribution of a typical downlink HetNet network.
- the HetNet consists of a macro base station and a micro base station.
- the micro base station can be a Pico base station or a Femtocell base station. It can also be a relay relay, which has a small transmission power and is therefore easier to arrange than a macro base station.
- the frequency reuse factor of the LTE system is 1, meaning that all neighboring cells transmit signals on the same frequency resource. Therefore, some macro cells are very seriously interfered by neighboring macro base stations/micro base stations, and some micro cells are very seriously interfered by the macro base station, and therefore performance compromises must be made in the HetNet network.
- the feedback mechanism between the LTE base station and the user equipment is defined in the R8 protocol of the LTE.
- the information exchanged between the LTE base station and the terminal equipment includes:
- CQI Channel Quality Indicator
- PMI Matrix Index
- Rank Indicator Indicates the rank that can be transmitted in the preferred MIMO mode.
- the feedback information can be sent periodically or non-period. It can be full-band feedback or sub-band feedback.
- the feedback can also be differential. This can combine the characteristics of the full band and the sub-band without loss of feedback accuracy or loss. Next, feedback as much as possible on all aspects of the information.
- the pilots that measure interference are not specified in the protocol. Therefore, the interference signals cannot be monopolized into Gaussian noise.
- interference is mainly determined in the following ways:
- MIMO transmission mode such as Space Division Multiple Access (SDMA), single-user multiplexing, etc.
- SDMA Space Division Multiple Access
- single-user multiplexing etc.
- the RRM scheduler Based on the information fed back by the UE, the RRM scheduler allocates time/frequency/space resources to a group of users, and each base station performs its own users based on its own scheduling policy.
- the base stations do not exchange scheduling information between them, especially between different levels of base stations in a HetNet scenario.
- the base station since the base station does not interact with the user scheduling information, the pre-scheduled interference situation is lack of pre-judgment, and the "crash" phenomenon of resources is likely to occur. For example, the base station schedules a higher on the same resource.
- the MCS or higher power makes the interference between the cells very large, and reduces the throughput of the entire mobile communication system.
- the embodiments of the present invention provide a user scheduling method, a primary base station, a user equipment, and a heterogeneous network, which are intended to solve the problem that the prior art does not interfere with the user scheduling information between the base stations, and thus the user does not have a pre-judgment after the scheduling.
- the interference between the cells is very large, which reduces the throughput problem of the entire mobile communication system.
- a user scheduling method includes:
- the primary base station receives the downlink interference indication DII forwarded by the service served by the user equipment UE from the base station, and the DII is sent to the serving slave station by the UE attached to the service from the base station, when the DII is greater than a preset threshold.
- the UE is in the high DII region;
- the UE is in a high DII area, when the primary base station performs scheduling, reducing the allocation may interfere with resources of the UE.
- a primary base station in another aspect, includes:
- a downlink interference indication receiving unit configured to receive a service that is served by the user equipment UE, and forward the service from the base station
- the downlink interference indication DII is that the DII is attached to the service from the UE of the base station to the serving slave base station, and when the DII is greater than a preset threshold, indicating that the UE is in a high DII area;
- An area determining unit configured to determine, according to the DII, whether the UE is in a high DII area
- a user scheduling unit configured to: when the UE is in a high DII area, perform scheduling, reduce allocation resources that may interfere with the UE .
- a user scheduling method includes:
- the user equipment calculates a downlink interference indication DII
- the calculating the downlink interference indication DII specifically includes:
- DII is calculated based on the interference power P_interference received from the primary base station and the received power P_Pni received from the base station.
- a user equipment where the user equipment includes:
- a DII acquisition unit configured to calculate a downlink interference indication DII
- the DII acquisition unit includes:
- a first DII acquiring module configured to calculate a weighted broadband/specific subband channel quality information CQI according to the broadband primary synchronization signal received from the primary base station;
- a second DII acquiring module configured to calculate DII according to the interference power P_interference received from the primary base station and the received power P_Pni received from the base station;
- a DII sending unit configured to send the downlink interference indication DII to the secondary base station.
- a heterogeneous network including a plurality of secondary base stations and a primary base station as described above, and the number of the secondary base stations is allocated by the primary base station.
- the downlink interference indication fed back by the UE is received from the base station (Downlink) After the Interference Indicator (DII), the DII is forwarded to the primary base station.
- the primary base station performs scheduling
- the active reduction may interfere with the resource allocation of the UE attached to the secondary base station, thereby reducing the resource allocation. Attached to interference received by the UE in the base station.
- FIG. 1 is a schematic diagram of a signal to interference plus noise ratio distribution of a typical downlink HetNet network
- FIG. 2 is a schematic structural diagram of a HetNet network according to Embodiment 1 of the present invention
- FIG. 3 is a schematic diagram of a HetNet cooperation area provided by Embodiment 1 of the present invention.
- FIG. 4 is a flowchart of implementing a user scheduling method according to Embodiment 2 of the present invention.
- FIG. 5 is a structural block diagram of a primary base station according to Embodiment 3 of the present invention.
- FIG. 6 is a flowchart of implementing a user scheduling method according to Embodiment 4 of the present invention.
- FIG. 7 is a structural block diagram of a slave base station according to Embodiment 5 of the present invention.
- FIG. 8 is a flowchart of implementing a user scheduling method according to Embodiment 6 of the present invention.
- FIG. 9 is a structural block diagram of a user equipment according to Embodiment 7 of the present invention.
- FIG. 10 is a structural block diagram of a heterogeneous network according to Embodiment 8 of the present invention. detailed description
- the DII that is attached to the slave base station sends the calculated DII to the slave base station, and after receiving the DII from the base station, forwarding the DII to the master base station, when the UE is in the high DII area.
- the interference received by the UE in the secondary base station is reduced by reducing the resource allocation that interferes with the UE attached to the secondary base station.
- the HetNet network architecture is an effective way to improve coverage and capacity in a cellular network. Under the existing architecture, interfaces such as X2 have been defined between nodes of the HetNet network. Through such interfaces, each node can exchange some information. To perform some coordinated operations.
- the present invention defines a new feedback mechanism to coordinate the interference between nodes in HetNet, and each node independently schedules the user equipment, thereby adding a small amount of complexity. In this case, the purpose of improving coverage and increasing throughput is achieved.
- FIG. 2 is a schematic structural diagram of a HetNet network according to Embodiment 1 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are as follows:
- the HetNet network is divided into a primary base station and a secondary base station, and the architecture of the primary base station-slave base station is given.
- the primary base station is the HetNet primary node labeled in FIG. 2
- the secondary base station is the HetNet labeled in FIG. From the node.
- Each of the secondary base stations may be numbered by the primary base station to distinguish each other. Intuitively, some reserved User Equipment (UE) IDs may be allocated to the secondary base stations, and some cell numbers may be reserved at each primary base station. , directly assigned to these tiny areas.
- UE User Equipment
- a HetNet area is composed of a macro base station and a group of low-power nodes, and the low-power node can be any node whose transmission power is smaller than that of the macro base station, such as a Pico base station, a Femtocell base station, and a Relay.
- the present invention is concentrated in a scenario where several low-power nodes are located in the same macro cell, and these low-power nodes are attached to the macro base station, and all the HetNet entities (nodes) together form a HetNet cooperation area, that is, the HetNet cooperation area shown in FIG. . It should be noted that in this collaboration area, each node is also independently scheduled.
- the secondary base station when the primary base station is a macro base station, the secondary base station is a group of low power nodes; when the primary base station is a low power node, the secondary base station is a macro base station and/or other low power nodes.
- FIG. 4 is a flowchart showing an implementation process of a user scheduling method according to Embodiment 2 of the present invention, which is described in detail as follows:
- a primary base station receives a downlink interference indication DII forwarded by a service served by a user equipment UE from a base station, and the DII And being attached to the service from the UE of the base station to the serving slave base station, when the DII is greater than a preset threshold, indicating that the UE is in a high DII area.
- the primary base station receives a downlink interference indication (DID) forwarded from the base station, where the UE attached to the secondary base station receives strong interference from the primary base station or receives the strongest interference from the primary base station, in order to improve performance.
- DII is calculated from the UE in the base station, and then the DII is fed back to the slave base station and forwarded by the slave base station to the master base station, the DII indicating that the UE is subjected to the strength of the trunk 4 from the master base station.
- the UE in the primary base station calculates DII, then feeds the DII back to the primary base station, and forwards it to the secondary base station by the primary base station.
- the primary base station may be a macro base station, or may be a power node PN, such as a Pico base station, a Femtocell base station, a relay, etc.; when the primary base station is a macro base station, the secondary base station is a low power node PN, such as a Pico base station, a Femtocell base station, and a relay.
- the primary base station is a low power node PN, such as a Pico base station, a Femtocell base station, a Relay, etc.
- the secondary base station is a macro base station and/or other low power nodes.
- the secondary base station is a low power node PN
- the strongest interference received by the user equipment UE of the PN is taken from the primary base station as an example, and the calculation is performed from other secondary base stations.
- a similar approach can be used for interfering DII.
- a method for the UE to calculate the DII according to the interference power P_interference received from the primary base station and the received power P_Pni received from the base station is:
- Step 1 Calculating the interference power received from the primary base station, P_interference;
- Step 2 Calculate the received power P_PNi received from the base station
- Step 3 calculating a ratio of the interference power to the received power ramda
- Step 4 Quantify the ratio to obtain DII.
- the DII is represented by 2 bits.
- the specific feedback mode can be explicit or implicit, and the explicit feedback refers to Specifically, the number of the base station or the identifier configured by the primary base station is implicitly indicated that only one DII can be fed back or fed back to a plurality of interfering base stations at a certain time according to a certain rule without specifically indicating the specific identification mark of the interfering base station. .
- the primary base station when considering interference from other slave base stations, the primary base station first obtains the base station identifier that has the greatest interference to the UE according to the DII fed back from the base station and the base station identifier of the DII, and then determines according to the base station identifier. Whether the base station with the largest UE interference is the primary base station or the interference secondary base station, and the interference from the base station is the other secondary base station that removes the serving secondary base station.
- reducing allocation may interfere with resources of the UE; if the UE is interfered by the base station with the greatest interference, when the UE is in a high DII area, the primary base station is according to the base station The identifier is forwarded to the corresponding interference slave base station, and when the interference is notified from the base station, the allocation may reduce the resources that may interfere with the UE.
- the DII format can refer to the existing feedback mechanism: 1) the bandwidth involved in DII, including subband DII, broadband/full band DII;
- DII feedback granularity including full feedback and differential feedback, with 2 bits, the state includes ⁇ 0, 1, 2, 3 ⁇ , or 1 bit to indicate the increase or decrease of DII information;
- Top-m or worst-m (the strongest or weakest m) interference sources The UE only feeds back the strongest m interference sources or the weakest m interference sources.
- the interference source can refer to Primary base station and/or other secondary base stations.
- top-m or worst-m (m strongest or weakest) subband/band When the feedback is the most interfered m subband/band, it indicates that the UE wants the corresponding interfering base station to try not to Scheduling resources in the m subbands/bands to avoid interference, when the feedback is the weakest m subbands/bands, indicating that the UE is substantially undisturbed or least interfered in the m subbands/bands, so other The base station can safely schedule resources on the m subbands/bands;
- DII feedback update frequency period (several milliseconds or several seconds), aperiodic (UE triggered, Or the base station triggers, or the primary base station of the HetNet collaboration area triggers).
- another method for calculating the DII by the UE is: taking into account the wideband channel quality indication (CQI) information, and defining the DII as the weighted broadband calculated according to the broadband primary synchronization signal received from other base stations.
- CQI wideband channel quality indication
- the synchronization sequence ie, synchronization signal
- the primary base station only needs to reduce the allocation or even the allocation of resources that may interfere with the resources of the UE when scheduling the UE that is the most interfered. Therefore, as a preferred embodiment of the present invention, the UE that calculates and feeds back the DII is the UE that is most interfered by the primary base station and is most affected by the service. Specifically, the primary base station can search for the UE with the largest interference according to the following two conditions. :
- Condition 2 Search for the i-th slave base station/W according to the preset received power threshold, and the UE whose received power is greater than the received power threshold PPM, to search for the UE that is most interfered by the primary base station.
- the searched UE satisfies the above two conditions at the same time, it indicates that the UE is the UE that is most interfered by the primary base station, that is, for the UE, according to the received power, there should be a relatively high SNR, and there should be a comparison.
- High spectral efficiency that is, it can have a higher MCS, but its actual spectral efficiency is lower than the preset spectral efficiency threshold (for condition 1, the threshold here can also use MCS threshold, SINR threshold, etc.) The reason is obviously a strong interference.
- step S402 it is determined according to the DII whether the UE is in a high DII area.
- step S403 if the UE is in the high DII area, when the primary base station performs scheduling, reducing the allocation may interfere with resources of the UE.
- the resource allocation that may interfere with the UE in the secondary base station may be reduced accordingly, thereby reducing interference from the primary base station received by the UE in the base station.
- the resources allocated to the UE may be reduced by the following three ways: 1.
- the primary base station may leave the null subframe to interfere with the resources of the UE. Therefore, it is ensured that no interference is generated to the UE in the base station; 2.
- the primary base station may choose to offload the partial UE to the secondary base station to ensure the fairness of the user scheduling, wherein the distance extension method is determined to be offloaded to the secondary base station.
- the HetNet has a method for determining whether the user accesses the primary base station or the secondary base station according to the distance extension (RE), that is, when the user determines whether to access the primary base station or the secondary base station, the reference signal of the secondary base station is allowed.
- the received signal Reference Signal Received Power, RSRP
- the UE still accesses the threshold of the secondary base station, and the user can be adjusted by dynamically adjusting the RE value.
- the proportion of access to the micro base station, such as when the primary base station is heavily loaded, the RE value can be larger, for example, from 6dB to 12d.
- the principle can be used to adjust the proportion of the user accessing the primary base station and the secondary base station by adjusting the threshold of the RE; 3.
- the primary base station can also reduce the transmit power by using the power adjustment method to reduce the low power PN. UE interference, such operations are more efficient.
- the DII can also assist in the handover selection after forwarding to the mobility management entity (Mobility Management Entity, ⁇ ) of the Evolved Packet Core (EPC).
- the primary base station receives the downlink interference indication DII fed back from the base station, when the primary base station performs scheduling, when the primary base station performs scheduling, the resource allocation that interferes with the UE attached to the secondary base station is reduced. Thereby, the interference of the UE from the base station to the primary base station is reduced.
- FIG. 5 is a structural block diagram of a primary base station according to Embodiment 3 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
- the primary base station 5 includes: a downlink interference indication receiving unit 51, an area determining unit 52, and a user scheduling unit 53.
- the downlink interference indication receiving unit 51 is configured to receive a downlink interference indication DII forwarded by the service served by the user equipment UE from the base station, where the DII is sent by the UE that is attached to the service from the base station to the serving slave base station, When the DII is greater than a preset threshold, indicating that the UE is in a high DII region;
- the area determining unit 52 is configured to determine, according to the DII, whether the UE is in a high DII area, and the user scheduling unit 53 is configured to: when the UE is in a high DII area, when scheduling, reducing allocation may interfere with the UE resource of.
- the user scheduling unit 53 includes: a first scheduling module, a second scheduling module, or a third scheduling module.
- the first scheduling module is configured to leave a null subframe to interfere with resources of the UE.
- a second scheduling module configured to perform partial UE offloading to the secondary base station to ensure fairness of user scheduling, where the UE that needs to be offloaded to the secondary base station is determined according to the distance extension method.
- the third scheduling module is configured to reduce the transmission power by using a power adjustment method.
- the base station further includes: a first UE search unit, a second UE search unit, and an interference determination unit.
- the first UE search unit is configured to search, according to a preset spectrum efficiency threshold, that the spectrum efficiency of the i-th slave base station/ 3 ⁇ is lower than the spectrum efficiency threshold (S ⁇ V, UE) To the UE that is most interfered by the primary base station;
- a second UE search unit configured to search, according to a preset received power threshold PPM, a UE whose received power from the base station/ 3 ⁇ is greater than the received power threshold PPM, to search for interference from the primary base station Largest UE;
- the interference judging unit is configured to: when the UE is in the high DII area, when the UE is in the high DII area, when the main base station performs scheduling, reduce to allocate resources that interfere with the UE.
- FIG. 6 is a flowchart showing an implementation process of a user scheduling method according to Embodiment 4 of the present invention. Details are as follows: In step 601, a downlink interference indication DII sent by a user equipment UE is received from a base station.
- step 602 the DII is sent from the base station to the primary base station, and the primary base station performs user scheduling according to the DII.
- FIG. 7 is a structural block diagram of a slave base station according to Embodiment 5 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
- the slave base station 7 includes: a DII receiving unit 71 and a DII transmitting unit 72.
- the DII receiving unit 71 is configured to receive a downlink interference indication DII sent by the user equipment UE.
- the DII sending unit 72 is configured to send the DII to the primary base station, and the primary base station performs user scheduling according to the DII.
- FIG. 8 is a flowchart showing an implementation process of a user scheduling method according to Embodiment 6 of the present invention, which is as follows:
- the user equipment calculates a downlink interference indication DII.
- the user equipment UE may calculate the weighted wideband/specific subband channel quality information CQI according to the broadband primary synchronization signal received from the primary base station, and use the CQI as the downlink interference indication DII;
- the received interference power P_interference and the received power P_Pni received from the base station are calculated to obtain DII.
- step 802 the downlink interference indication DII is transmitted to the secondary base station.
- FIG. 9 is a structural block diagram of a user equipment according to Embodiment 7 of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown.
- the user equipment 9 includes: a DII acquisition unit 91 and a DII transmission unit 92.
- the DII obtaining unit 91 is configured to calculate a downlink interference indication DII;
- the DII transmitting unit 92 is configured to send the downlink interference indication DII to the secondary base station.
- the DII acquiring unit 91 includes a first DII acquiring module, and the first DII acquiring module is configured to calculate a weighted broadband/specific subband channel quality information CQI according to the broadband primary synchronization signal received from the primary base station. .
- the DII acquiring unit 91 further includes a second DII acquiring module, where the second DII acquiring module is configured to calculate DII according to the interference power P_interference received from the primary base station and the received power P_Pni received from the base station. .
- the second DII acquiring module includes: an interference power acquiring submodule, a receiving power obtaining submodule, a ratio obtaining submodule, and a quantizing submodule.
- the interference power acquisition submodule is configured to calculate the interference power received from the primary base station.
- a receiving power acquisition submodule configured to calculate a received power P_PNi received from the base station
- a ratio obtaining submodule configured to calculate a ratio of the interference power to the received power ramda
- a quantization submodule configured to quantize the ratio to obtain a corresponding DII.
- the DII acquiring unit 91 further includes a third DII acquiring module, where the third DII acquiring module is configured to calculate according to the interference power PjnterferenceJ received from the other slave base stations and the received power P_Pni received from the base station. DII is obtained, where j is the sequential number of other slave base stations.
- the third DII acquiring module includes: an interference power acquisition submodule, a receiving power acquisition submodule, a ratio acquisition submodule, and a quantization submodule.
- the interference power acquisition sub-module is configured to calculate interference power received from other slave base stations.
- a receiving power acquisition submodule configured to calculate a received power P_PNi received from the base station
- a ratio obtaining submodule configured to calculate a ratio of the interference power to the received power ramda
- a quantization submodule configured to quantize the ratio to obtain a corresponding DII.
- FIG. 10 is a structural block diagram of a heterogeneous network according to Embodiment 8 of the present invention.
- the heterogeneous network 10 includes: a primary base station 101 and at least one secondary base station 102, wherein the primary base station 101 includes: a downlink interference indication receiving unit 1011, an area determining unit 1012, and a user scheduling unit 1013.
- the downlink interference indication receiving unit 1011 is configured to receive a downlink interference indication DII forwarded by the service served by the user equipment UE from the base station, where the DII is sent by the UE that is attached to the service from the base station to the serving slave base station, When the DII is greater than a preset threshold, indicating that the UE is in a high DII region;
- the area determining unit 1012 is configured to determine, according to the DII, whether the UE is in a high DII area
- the user scheduling unit 1013 is configured to: when the UE is in a high DII area, perform scheduling, and reducing allocation may interfere with the UE. resource of.
- the user scheduling unit 1013 includes: a first scheduling module, a second scheduling module, or a third scheduling module.
- the first scheduling module is configured to leave a null subframe to interfere with resources of the UE.
- a second scheduling module configured to perform partial UE offloading to the secondary base station to ensure fairness of user scheduling, where the UE that needs to be offloaded to the secondary base station is determined according to the distance extension method.
- the third scheduling module is configured to reduce the transmission power by using a power adjustment method.
- the base station further includes: a first UE search unit, and a second
- the UE searches for the first unit, for limiting the spectral efficiency of the door according to a preset search from the base station to the i-th / 3 ⁇ spectral efficiency is the spectral efficiency is lower than the service threshold ⁇ 3 ⁇ ⁇ the UE, in order to search for a UE that is most interfered by the primary base station;
- a second UE search unit configured to search, according to a preset received power threshold PPM, a UE that is received by the ith slave base station and whose received power is greater than the received power threshold PPV, to search for interference from the primary base station Largest UE;
- the interference judging unit is configured to: when the UE is in the high DII area, when the UE is in the high DII area, when the main base station performs scheduling, reduce to allocate resources that interfere with the UE.
- the slave base station 102 includes: a DII receiving unit 1021 and a DII transmitting unit 1022.
- the DII receiving unit 1021 is configured to receive the downlink interference indication DII sent by the user equipment UE
- the DII sending unit 1022 is configured to send the DII to the primary base station, where the primary base station performs user scheduling according to the DII.
- each unit included is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be implemented;
- the specific names are also for convenience of distinguishing from each other and are not intended to limit the scope of the present invention.
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Abstract
本发明适用于通信技术领域,提供了一种用户调度方法、主基站、用户设备及异构网络,所述方法包括:主基站接收为用户设备(UE)服务的服务从基站转发的下行干扰指示(DII),所述DII是附着于服务从基站的UE发送至服务从基站的,当所述DII大于预设的阈值时,表示所述UE处于高DII区域(S401);根据所述DII判断所述UE是否处于高DII区域(S402);如果所述UE处于高DII区域,则所述主基站进行调度时,减少分配会干扰到所述UE的资源(S403)。本发明,从基站接收到UE反馈的DII后,转发所述DII至主基站,在UE处于高DII区域,主基站进行调度时,主动减少会干扰到附着于从基站中的UE的资源分配,从而减少了附着于从基站中的UE受到的干扰。
Description
一种用户调度方法、 主基站、 用户设备及异构网络 技术领域
本发明属于通信技术领域, 尤其涉及一种用户调度方法、 主基站、 用户设 备及异构网络。 背景技术
长期演进( Long Term Evolution, LTE )的 R8协议及其后续版本定义了基 本的反馈模式以优化传输效率, 特别是针对下行传输, 根据频选特性在无线资 源管理(Radio Resource Management, RRM ) 实体中进行调度, 包括调制编码 方式 ( modulation and coding scheme, MCS)选择、 多输入多输出 ( Multiple-Input Multiple-Output, MIMO )模式选择、 用户选择等。 在异构网络( heterogeneous network , HetNet ) 中, 由于干扰来自本身宏小区、 相邻宏小区、 其它微小区 等多个干扰源, 所以干扰本身并不能筒单地认为是高斯白噪声, 因此需要改进 反馈机制, 尽量使干扰只包括来自宏小区的干扰信息, 这样可以有效地改进微 小区的性能。相应地,在协议中也要明确将干扰情况知会进行合作的多个基站, 以协调相应的无线资源。由于该协作只需要在 HetNet中的一小部分微小区中进 行, 因此实现难度较小, 当然, 并不排除更大范围的协作。
在宏小区中引入微小区(包括微微蜂窝 Picocell, 飞蜂窝 Femtocell等)后, 小区密度加大, 这样可以有效地增强覆盖、 增加系统容量, 通常为了有效地利 用频率资源, 在同一个宏小区中采用同样的频率, 但是这样一来就自然增加了 邻区干扰, 如何解决这个问题呢? 表 1为各种小区类型所对应的发射功率:
Picocell ~ 23-30
Femtocell < 23
表 1
图 1所示为一个典型的下行 HetNet网络的信号与干扰加噪声比( Signal to Interference plus Noise Ratio, SINR )分布图, HetNet由宏基站和微基站组成, 微基站可以是 Pico基站, Femtocell基站, 也可以是中继 Relay, 微基站发送功 率较小, 因此比宏基站布站更容易。 通常 LTE系统的频率复用因子为 1 , 意味 着所有相邻的小区都在相同的频率资源上传送信号。 所以有些宏小区受到相邻 宏基站 /微基站的干扰非常严重, 而有些微小区受所在的宏基站干扰非常严重, 也因此 HetNet网络中必须进行性能折中。
LTE的 R8协议中定义了 LTE基站和用户设备之间的反馈机制, LTE基站 和终端设备之间所交互的信息包括:
1、 信道质量信息 ( Channel Quality Indicator, CQI)、 指示最佳 MCS;
2、 优选矩阵索引 (Preferred Matrix Index, PMI): 指示优选预编码矩阵;
3、 秩指示 (Rank Indicator, RI): 指示在优选 MIMO模式下可传输的秩。 反馈信息可以周期也可以非周期发送,可以是全带反馈也可以是子带反馈, 反馈还可以采用差分方式, 这样可以结合全带和子带的特点, 在不损失反馈精 度或者损失较小的情况下,尽量多地反馈各方面的信息。 在协议中并未规定测 量干扰的导频, 因此, 干扰信号并不能筒单地筒化为高斯噪声, 在现有的方式 中, 干扰主要通过以下几种方式决定:
1、 天线个数 /极化方式;
2、 MIMO传输模式, 比如空分复用接入 ( Space Division Multiple Access , SDMA ) 、 单用户复用等等;
3、 天线下倾角;
4、 发送功率。
基于 UE反馈的信息, RRM调度器对一组用户进行时间 /频率 /空间资源的分 配, 每个基站在调度其用户时, 都是基于其自身的调度策略各自进行的, 在目 前的协议中, 基站之间并不交互调度信息, 特别是如 HetNet场景中的不同层次 的基站之间。
这种调度方式下, 由于基站间并不交互用户调度信息, 因此对调度后的干 扰情况缺乏预判, 很容易出现资源的 "撞车" 现象, 比如基站在相同的资源上 都调度了较高的 MCS或者较高的功率, 使得各个小区彼此之间的干扰非常大, 反而降低了整个移动通信系统的吞吐量。 技术问题
本发明实施例提供了一种用户调度方法、 主基站、 用户设备及异构网络, 旨在解决现有技术由于基站间并不交互用户调度信息, 因此对用户调度后的干 扰情况缺乏预判, 使得各个小区彼此之间的干扰非常大, 反而降低了整个移动 通信系统的吞吐量问题。 技术解决方案
一方面, 提供一种用户调度方法, 所述方法包括:
主基站接收为用户设备 UE服务的服务从基站转发的下行干扰指示 DII,所 述 DII是附着于所述服务从基站的 UE发送至所述服务从基站的, 当所述 DII 大于预设的阈值时, 表示所述 UE处于高 DII区域;
根据所述 DII判断所述 UE是否处于高 DII区域;
如果所述 UE处于高 DII区域, 则所述主基站进行调度时, 减少分配会干 扰到所述 UE的资源。
另一方面, 提供一种主基站, 所述主基站包括:
下行干扰指示接收单元, 用于接收为用户设备 UE服务的服务从基站转发
的下行干扰指示 DII,所述 DII是附着于所述服务从基站的 UE发送至所述服务 从基站的, 当所述 DII大于预设的阈值时, 表示所述 UE处于高 DII区域;
区域判断单元, 用于根据所述 DII判断所述 UE是否处于高 DII区域; 用户调度单元, 用于如果所述 UE处于高 DII区域, 则进行调度时, 减少 分配会干扰到所述 UE的资源。
再一方面, 提供一种用户调度方法, 所述方法包括:
用户设备计算下行干扰指示 DII;
所述计算下行干扰指示 DII具体包括:
根据从主基站接收到的宽带主同步信号,计算得到加权宽带 /特定子带信道 质量信息 CQI; 或
根据从主基站接收到的干扰功率 P_interference和从从基站接收到的接收 功率 P_Pni计算得到 DII。
发送所述下行干扰指示 DII至从基站。
又一方面, 提供一种用户设备, 所述用户设备包括:
DII获取单元, 用于计算下行干扰指示 DII;
所述 DII获取单元包括:
第一 DII获取模块, 用于根据从主基站接收到的宽带主同步信号, 计算得 到加权宽带 /特定子带信道质量信息 CQI; 或
第二 DII获取模块, 用于根据从主基站接收到的干扰功率 P_interference和 从从基站接收到的接收功率 P_Pni计算得到 DII;
DII发送单元, 用于发送所述下行干扰指示 DII至从基站。
再一方面, 提供一种异构网络, 所述异构网络中包括多个从基站和如上所 述的主基站和, 所述从基站的编号由所述主基站分配。 有益效果
在本发明实施例中, 从基站接收到 UE反馈的下行干扰指示 (Downlink
Interference Indicator, DII )后, 转发所述 DII至主基站, 在所述 UE处于高 DII 区域时, 主基站进行调度时, 主动减少会干扰到附着于从基站中的 UE的资源 分配, 从而减少了附着于从基站中的 UE受到的干扰。 附图说明
图 1是典型的下行 HetNet网络的信号与干扰加噪声比分布示意图; 图 2是本发明实施例一提供的 HetNet网络的结构示意图;
图 3是本发明实施例一提供的 HetNet合作区域示意图;
图 4是本发明实施例二提供的用户调度方法的实现流程图;
图 5是本发明实施例三提供的主基站的结构框图;
图 6是本发明实施例四提供用户调度方法的实现流程图;
图 7是本发明实施例五提供的从基站的结构框图;
图 8是本发明实施例六提供用户调度方法的实现流程图;
图 9是本发明实施例七提供的用户设备的结构框图;
图 10示出了本发明实施例八提供的异构网络的结构框图。 具体实施方式
为了使本发明的目的、 技术方案及优点更加清楚明白, 以下结合附图及实 施例, 对本发明进行进一步详细说明。 应当理解, 此处所描述的具体实施例仅 仅用以解释本发明, 并不用于限定本发明。
在本发明实施例中, 附着于从基站中的 UE将计算所得的 DII发送至从基 站, 从基站接收到所述 DII后, 转发所述 DII至主基站, 在所述 UE处于高 DII 区域时, 主基站进行调度时, 通过减少会干扰到附着于从基站中 UE的资源分 配, 来减少所述从基站中的 UE受到的干扰。 实施例一
HetNet网络架构是蜂窝网中提升覆盖和容量的有效方式,在现有的架构下, HetNet网络的各个节点间已经定义了比如 X2这样的接口, 通过这样的接口, 各个节点之间可以交互一些信息, 以进行一些协调操作。 为了处理彼此间的干 扰, 本发明在此基础上, 定义一种新的反馈机制, 以协调 HetNet中各节点间的 干扰, 并由各节点独立对用户设备进行调度,从而在增加少量复杂度的情况下, 实现改善覆盖、 增加吞吐量的目的。
图 2示出了本发明实施例一提供的 HetNet网络的结构示意图, 为了便于说 明, 仅示出了与本发明实施例相关的部分, 详述如下:
在本实施例中, 将 HetNet 网络分成主基站和从基站, 给出了主基站 -从基 站的架构, 主基站即为图 2中标注的 HetNet主节点, 从基站即为图 2中标注的 HetNet从节点。 每个从基站可以由主基站编号以分辨彼此, 直观地, 可以将一 些预留的用户设备( User Equipment , UE ) ID分配给这些从基站, 也可以在每 个主基站处预留一些小区号, 直接分配给这些微小区。
如前所述, 一个 HetNet区域由宏基站和一组低功率节点组成, 低功率节点 可以是任一发射功率小于宏基站的节点, 比如 Pico基站, Femtocell基站, Relay 等。 本发明聚集于数个低功率节点位于同一个宏小区的场景, 这些低功率节点 都附着于该宏基站, 所有的 HetNet实体(节点)一起形成 HetNet协作区域, 即图 3所示的 HetNet合作区域。 需要注意的是, 在该协作区域中, 各节点还是 独立调度的。 需要说明的是, 本发明实施例中, 当主基站是宏基站时, 从基站 是一组低功率节点; 当主基站是一个低功率节点时, 从基站为宏基站和 /或其他 低功率节点。
实施例二
图 4示出了本发明实施例二提供的用户调度方法的实现流程, 详述如下: 在步骤 S401中,主基站接收为用户设备 UE服务的服务从基站转发的下行 干扰指示 DII,所述 DII是附着于所述服务从基站的 UE发送至所述服务从基站 的, 当所述 DII大于预设的阈值时, 表示所述 UE处于高 DII区域。
在本实施例中, 主基站接收从基站转发的下行干扰指示 (Downlink Interference, DID, 其中, 附着于从基站的 UE受到来自主基站的强干扰或者受 到的最强干扰来自主基站, 为了改善性能, 从基站中的 UE计算 DII, 然后将该 DII反馈至从基站, 并由从基站转发至主基站, 该 DII表示 UE受到来自主基站 的干 4尤强度。
类似地, 当附着于主基站的 UE受到来自其他从基站的强干扰时, 主基站 中的 UE计算 DII, 然后将该 DII反馈至主基站, 并由主基站转发至从基站。
其中, 主基站可以为宏基站, 也可以为^ 功率节点 PN, 比如 Pico基站, Femtocell基站, Relay等; 当主基站为宏基站时, 从基站为低功率节点 PN, 比 如 Pico基站, Femtocell基站, Relay等; 当主基站为低功率节点 PN, 比如 Pico 基站, Femtocell基站, Relay等时, 从基站为宏基站和 /或其他低功率节点。 本 实施例中, 为了方便叙述, 以主基站为宏基站时, 从基站为低功率节点 PN, 且 PN的用户设备 UE受到的最强干扰来自主基站为例来进行说明,计算来自其他 从基站干扰的 DII也可以采用类似方法。
具体的, 一种 UE根据从主基站接收到的干扰功率 P_interference和从从基 站接收到的接收功率 P_Pni计算得到 DII的方法为:
步骤 1、 计算从主基站接收到的干扰功率 P_interference;
步骤 2、 计算从从基站接收到的接收功率 P_PNi;
步骤 3、 计算所述干扰功率与所述接收功率的比值 ramda;
步骤 4、 对所述比值进行量化, 得到 DII, 在本实施例中, 该 DII用 2比特 表示。
其中, 所述比值进行量化后, 得到 2个比特的信息, 该 2个比特的信息可 以解释为将干扰分为极强干扰、 强干扰、 普通干扰和小干扰, 即 DII={0, 1 , 2, 3} , 其中, 0, 1 , 2, 3分别表示小干扰、 普通干扰、 强干扰和极强干扰。 当然, 也可以其他数量的比特数表示干扰的等级。
需要指出的是, 如果仅考虑来自主基站的干扰, 那么反馈 DII的时候无需
反馈干扰基站识别标志,如果一并考虑来自其他从基站的干扰,那么在反馈 DII 的时候,还要反馈相应的基站识别标志, 具体的反馈方式可以显式也可以隐式, 显式反馈是指具体反馈该基站的编号或者由主基站配置的识别符, 隐式指按照 一定的规则规定在某一时刻只能反馈一个或者依次反馈多个干扰基站的 DII而 无需特别指出干扰基站的具体识别标志。
因此, 一并考虑来自其它从基站的干扰时, 主基站首先要根据从基站反馈 的 DII以及所述 DII的基站标识, 得到对 UE干扰最大的基站标识, 再根据所 述基站标识判断对所述 UE干扰最大的基站是主基站还是干扰从基站, 所述干 扰从基站是除去服务从基站的其它从基站, 如果所述 UE受到主基站的干扰最 大, 则在所述 UE处于高 DII区域时, 所述主基站进行调度时, 减少分配会干 扰到所述 UE的资源; 如果所述 UE受到干扰从基站的干扰最大, 则在所述 UE 处于高 DII区域时, 所述主基站根据所述基站标识转发所述 DII至相应的干扰 从基站, 通知所述干扰从基站进行调度时, 减少分配会干扰到所述 UE的资源。
其中, DII格式可以参考已有的反馈机制: 1 ) DII涉及的带宽, 包括子带 DII, 宽带 /全带 DII;
2 ) DII反馈的粒度: 包括全反馈和差分反馈, 用 2个比特, 状态包括 {0, 1 , 2, 3} , 或者用 1个比特表示 DII信息的增减;
3 ) top-m或者 worst-m (最强或者最弱的 m个)个干扰源: UE只反馈最 强的 m个干扰源或者最弱的 m个干扰源,这里所谓干扰源是可以是指主基站和 /或其他从基站。
4 ) top-m或者 worst-m (受干扰最强或者最弱的 m个)子带 /频带: 当反馈 受干扰最强的 m个子带 /频带时,表明该 UE希望相应的干扰基站尽量不要在该 m个子带 /频带调度资源以避免干扰, 当反馈受干扰最弱的 m个子带 /频带时, 表明该 UE在该 m个子带 /频带上基本不受干扰或者受到的干扰最小,所以其他 基站可以放心在该 m个子带 /频带上调度资源;
5 ) DII反馈更新频率: 周期(若干毫秒或者若干秒) , 非周期(UE触发,
或者基站触发, 或者 HetNet协作区域的主基站触发) 。
具体的,另一种 UE计算 DII的方法为:将宽带信道质量指示( channel quality indication, CQI )信息考虑进来, 可以将 DII定义为根据从其他基站接收到的 宽带主同步信号计算得到的加权宽带 /特定子带 CQI值,由于各个基站所用的同 步序列 (即同步信号)都不一样, 因此可以根据不同序列计算得到的 CQI值来 判断来自哪一个基站的干扰更强, 强度是多少, 从而表征该 UE所经受的干扰。 也就是说, UE需要计算来自多个干扰基站的 DII值。
另外, 需要说明的是, 为了节省资源, 主基站只需要对受到干扰最大的 UE 进行调度时, 采取减少分配甚至不分配会干扰到该 UE的资源的策略。 因此, 作为本发明的一个优选实施例, 计算并反馈 DII的 UE是受到主基站干扰最大、 业务最受影响的 UE, 具体的, 主基站可以根据以下两个条件来搜索得到受到 干扰最大的 UE:
条件 1、 按照预先设定的频谱效率门限 Λ^,·, 搜索第 i个从基站 iW,所服 务的频谱效率低于所述频谱效率门限 Λ3^·的 UE, 以搜索到受到主基站干扰最 大的 UE;
条件 2、 按照预先设定的接收功率门限 搜索第 i个从基站/ W,所服 务的接收功率大于所述接收功率门限 PPM的 UE,以搜索到受到主基站干扰最 大的 UE。
如果搜索到的 UE同时满足上述两个条件, 则表示所述 UE是受到主基站 干扰最大的 UE, 也就是说, 对于该 UE, 本来按照接收功率, 应该有比较高的 SNR, 就应该有较高的频谱效率, 也就是可以有较高的 MCS, 但其实际的频谱 效率反而还低于预先设定的频谱效率门限(对于条件 1 , 这里的门限也可以用 MCS门限, SINR门限等) , 原因显然是受到了强干扰。
在步骤 S402中, 根据所述 DII判断所述 UE是否处于高 DII区域。
在本实施例中, DII为 2个比特的信息, 该 2个比特的信息可以解释为将
干扰分为极强干扰、 强干扰、 普通干扰和小干扰, 即 DII={0, 1 , 2, 3} , 其中, 0, 1 , 2, 3分别表示小干扰、 普通干扰、 强干扰和极强干扰。 当然, 也可以其 他数量的比特数表示干扰的等级。 在本实施例中, 当 DII大于等于 2时, 表示 该 UE处于高 DII区域。
在步骤 S403中,如果所述 UE处于高 DII区域,则所述主基站进行调度时, 减少分配会干扰到所述 UE的资源。
在本实施例中, 如果所述 UE处于高 DII区域, 则当主基站进行调度时, 可以相应地减少会干扰到从基站中 UE的资源分配, 从而减少从基站中 UE所 受主基站的干扰。 比如, 如果所述 UE处于高 DII区域, 可以通过如下 3种方 式来减少分配会干扰到所述 UE的资源: 1、 主基站可以发送空子帧的方式留空 会干扰到所述 UE的资源, 从而确保不对从基站中的 UE产生干扰; 2、 主基站 可以选择把部分 UE卸载到从基站中去, 来保证用户调度的公平性, 其中, 根 据距离延伸法来确定需要卸载至从基站中的 UE, 具体的, HetNet中有根据距 离延伸 ( Range Extension, RE )确定用户接入主基站还是从基站的方法, 即用 户在判断接入主基站还是从基站的时候, 容许在从基站的参考信号接收功率 ( Reference Signal Received Power, RSRP ) 氐于主基站的 RSRP—定数值 (即 RE值) 的情况下, 所述 UE依然接入从基站的门限值, 通过动态调整 RE值, 可以调整用户接入微基站的比例, 比如主基站负载较重的时候, RE值可以取得 大一些, 例如从 6dB增加到 12dB, 这样可以增加接入从基站的用户, 即称为 "卸载" , 而在主基站负载较轻的时候, RE值可以取得小一些。 在本发明中, 可以借用该原理,通过调整 RE的门限值调整用户接入主基站和从基站的比例; 3、 主基站还可以利用功率调整的方法降低发射功率以减少对低功率 PN中 UE 的干扰, 这样的运营更有效率。
另夕卜, 该 DII—旦转发到分组核心演进节点 (Evolved Packet Core, EPC ) 的移动性管理实体 ( Mobility Management Entity , ΜΜΕ )后, 还可以辅助进行 切换选择。
本实施例, 主基站接收到从基站反馈的下行干扰指示 DII后, 在所述 UE 处于高 DII区域时, 主基站进行调度时, 减少会干扰到附着于所述从基站的 UE 的资源分配, 从而减少了从基站中 UE受到主基站的干扰。
实施例三
图 5示出了本发明实施例三提供的主基站的结构框图, 为了便于说明, 仅 示出了与本发明实施例相关的部分。 在本实施例中, 所述主基站 5包括: 下行 干扰指示接收单元 51、 区域判断单元 52和用户调度单元 53。
其中, 下行干扰指示接收单元 51 , 用于接收为用户设备 UE服务的服务从 基站转发的下行干扰指示 DII,所述 DII是附着于所述服务从基站的 UE发送至 所述服务从基站的, 当所述 DII大于预设的阈值时, 表示所述 UE处于高 DII 区域;
区域判断单元 52, 用于根据所述 DII判断所述 UE是否处于高 DII区域; 用户调度单元 53 , 用于如果所述 UE处于高 DII区域, 则进行调度时, 减 少分配会干扰到所述 UE的资源。
进一步地, 所述用户调度单元 53包括: 第一调度模块、 第二调度模块或第 三调度模块。 其中, 第一调度模块, 用于采用发送空子帧的方式留空会干扰到 所述 UE的资源。
第二调度模块, 用于部分 UE卸载到从基站中去, 来保证用户调度的公平 性, 其中, 根据距离延伸法来确定需要卸载至从基站中的 UE。
第三调度模块, 用于利用功率调整的方法降低发射功率。
作为本发明的另一个实施例, 所述基站还包括: 第一 UE搜索单元、 第二 UE搜索单元和干扰判断单元。 其中, 第一 UE搜索单元, 用于按照预先设定的频谱效率门限 搜索 到第 i个从基站/3^所服务的频谱效率低于所述频谱效率门限 (S^ V,的 UE, 以 搜索到受到主基站干扰最大的 UE;
第二 UE搜索单元, 用于按照预先设定的接收功率门限 PPM , 搜索到第 i 个从基站/3^所服务的接收功率大于所述接收功率门限 PPM的 UE,以搜索到 受到主基站干扰最大的 UE;
干扰判断单元, 用于如果搜索到的 UE同时满足上述两个条件, 则执行在 所述 UE处于高 DII区域时, 所述主基站进行调度时, 减少为分配会干扰到所 述 UE的资源。
实施例四
图 6示出了本发明实施例四提供的用户调度方法的实现流程, 详述如下: 在步骤 601中, 从基站接收用户设备 UE发送的下行干扰指示 DII。
在步骤 602中, 从基站发送所述 DII至主基站, 所述主基站根据所述 DII 进行用户调度。
实施例五
图 7示出了本发明实施例五提供的从基站的结构框图, 为了便于说明, 仅 示出了与本发明实施例相关的部分。 在本实施例中, 所述从基站 7 包括: DII 接收单元 71和 DII发送单元 72。
其中, DII接收单元 71 , 用于接收用户设备 UE发送的下行干扰指示 DII;
DII发送单元 72, 用于发送所述 DII至主基站, 所述主基站根据所述 DII 进行用户调度。
实施例六
图 8示出了本发明实施例六提供的用户调度方法的实现流程, 详述如下: 在步骤 801中, 用户设备计算下行干扰指示 DII。
在本实施中, 用户设备 UE可以根据从主基站接收到的宽带主同步信号, 计算得到加权宽带 /特定子带信道质量信息 CQI,将所述 CQI作为下行干扰指示 DII; 也可以根据从主基站接收到的干扰功率 P_interference和从从基站接收到 的接收功率 P_Pni计算得到 DII。 其中, 根据从主基站接收到的干扰功率
P_interference和从从基站接收到的接收功率 P_Pni计算得到 DII的步骤详见实
施例二中的描述, 在此不再赘述。
在步骤 802中, 发送所述下行干扰指示 DII至从基站。
实施例七
图 9示出了本发明实施例七提供的用户设备的结构框图, 为了便于说明, 仅示出了与本发明实施例相关的部分。 在本实施例中, 所述用户设备 9包括: DII获取单元 91和 DII发送单元 92。
其中, DII获取单元 91 , 用于计算下行干扰指示 DII;
DII发送单元 92, 用于发送所述下行干扰指示 DII至从基站。
进一步地, 所述 DII获取单元 91包括第一 DII获取模块, 所述第一 DII获 取模块, 用于根据从主基站接收到的宽带主同步信号, 计算得到加权宽带 /特定 子带信道质量信息 CQI。
进一步地, 所述 DII获取单元 91还包括第二 DII获取模块, 所述第二 DII 获取模块,用于根据从主基站接收到的干扰功率 P_interference和从从基站接收 到的接收功率 P_Pni计算得到 DII。
进一步地, 所述第二 DII获取模块包括: 干扰功率获取子模块、 接收功率 获取子模块、 比值获取子模块和量化子模块。
其中, 干扰功率获取子模块, 用于计算从主基站接收到的干扰功率
P_interference;
接收功率获取子模块, 用于计算从从基站接收到的接收功率 P_PNi;
比值获取子模块, 用于计算所述干扰功率与所述接收功率的比值 ramda; 量化子模块, 用于对所述比值进行量化, 得到相应的 DII。
进一步地, 所述 DII获取单元 91还包括第三 DII获取模块, 所述第三 DII 获取模块, 用于根据从其他从基站接收到的干扰功率 PjnterferenceJ和从服务 从基站接收到的接收功率 P_Pni计算得到 DII,这里 j为其他从基站的顺序编号。
进一步地, 所述第三 DII获取模块包括: 干扰功率获取子模块、 接收功率 获取子模块、 比值获取子模块和量化子模块。
其中, 干扰功率获取子模块, 用于计算从其他从基站接收到的干扰功率
P_interferenceJ;
接收功率获取子模块, 用于计算从从基站接收到的接收功率 P_PNi;
比值获取子模块, 用于计算所述干扰功率与所述接收功率的比值 ramda; 量化子模块, 用于对所述比值进行量化, 得到相应的 DII。
实施例八
图 10示出了本发明实施例八提供的异构网络的结构框图, 为了便于说明, 仅示出了与本发明实施例相关的部分。 在本实施例中, 所述异构网络 10包括: 主基站 101和至少一个从基站 102, 其中, 所述主基站 101 包括: 下行干扰指 示接收单元 1011、 区域判断单元 1012和用户调度单元 1013。
其中, 下行干扰指示接收单元 1011 , 用于接收为用户设备 UE服务的服务 从基站转发的下行干扰指示 DII,所述 DII是附着于所述服务从基站的 UE发送 至所述服务从基站的, 当所述 DII大于预设的阈值时, 表示所述 UE处于高 DII 区域;
区域判断单元 1012, 用于根据所述 DII判断所述 UE是否处于高 DII区域; 用户调度单元 1013, 用于如果所述 UE处于高 DII区域, 则进行调度时, 减少分配会干扰到所述 UE的资源。
进一步地, 所述用户调度单元 1013包括: 第一调度模块、 第二调度模块或 第三调度模块。 其中, 第一调度模块, 用于采用发送空子帧的方式留空会干扰 到所述 UE的资源。
第二调度模块, 用于部分 UE卸载到从基站中去, 来保证用户调度的公平 性, 其中, 根据距离延伸法来确定需要卸载至从基站中的 UE。
第三调度模块, 用于利用功率调整的方法降低发射功率。
作为本发明的另一个实施例, 所述基站还包括: 第一 UE搜索单元、 第二
UE搜索单元和干扰判断单元。
其中, 第一 UE搜索单元, 用于按照预先设定的频谱效率门限 搜索 到第 i个从基站/3^所服务的频谱效率低于所述频谱效率门限 Λ3^·的 UE, 以 搜索到受到主基站干扰最大的 UE;
第二 UE搜索单元, 用于按照预先设定的接收功率门限 PPM , 搜索到第 i 个从基站尸^所服务的接收功率大于所述接收功率门限 PPV,的 UE, 以搜索到 受到主基站干扰最大的 UE;
干扰判断单元, 用于如果搜索到的 UE同时满足上述两个条件, 则执行在 所述 UE处于高 DII区域时, 所述主基站进行调度时, 减少为分配会干扰到所 述 UE的资源。
其中, 所述从基站 102包括: DII接收单元 1021和 DII发送单元 1022。 其中, DII接收单元 1021 ,用于接收用户设备 UE发送的下行干扰指示 DII; DII发送单元 1022, 用于发送所述 DII至主基站, 所述主基站根据所述 DII 进行用户调度。
值得注意的是, 上述系统实施例中, 所包括的各个单元只是按照功能逻辑 进行划分的, 但并不局限于上述的划分, 只要能够实现相应的功能即可; 另夕卜, 各功能单元的具体名称也只是为了便于相互区分, 并不用于限制本发明的保护 范围。
另外, 本领域普通技术人员可以理解实现上述各实施例方法中的全部或部 分步骤是可以通过程序来指令相关的硬件来完成, 相应的程序可以存储于一计 算机可读取存储介质中, 所述的存储介质, 如 ROM/RAM、 磁盘或光盘等。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在本发 明的精神和原则之内所作的任何修改、 等同替换和改进等, 均应包含在本发明 的保护范围之内。
Claims
1、 一种用户调度方法, 其特征在于, 所述方法包括:
主基站接收为用户设备 UE服务的服务从基站转发的下行干扰指示 DII,所 述 DII是附着于所述服务从基站的 UE发送至所述服务从基站的, 当所述 DII 大于预设的阈值时, 表示所述 UE处于高 DII区域;
根据所述 DII判断所述 UE是否处于高 DII区域;
如果所述 UE处于高 DII区域, 则所述主基站进行调度时, 减少分配会干 扰到所述 UE的资源。
2、 如权利要求 1所述的方法, 其特征在于, 在所述主基站接收为用户设备 UE服务的服务从基站转发的下行干扰指示 DII的之外,所述主基站还接收所述 DII的基站标识, 在所述 UE处于高 DII区域, 所述主基站进行调度时, 减少分 配会干扰到所述 UE的资源之前或之后, 所述方法还包括:
所述主基站根据所述 DII以及所述 DII的基站标识, 得到对所述 UE干扰 最大的基站标识;
根据所述基站标识判断对所述 UE干扰最大的基站是主基站还是干扰从基 站, 所述干扰从基站是除去服务从基站的其它从基站;
如果所述 UE受到主基站的干扰最大,则在所述 UE处于高 DII区域时,所 述主基站进行调度时, 减少分配会干扰到所述 UE的资源;
如果所述 UE受到干扰从基站的干扰最大,则在所述 UE处于高 DII区域时, 所述主基站根据所述基站标识转发所述 DII至相应的干扰从基站, 通知所述干 扰从基站进行调度时, 减少分配会干扰到所述 UE的资源。
3、 如权利要求 1所述的方法, 其特征在于, 所述在所述 UE处于高 DII区 域时, 所述主基站进行调度时, 减少分配会干扰到所述 UE的资源具体为: 采用发送空子帧的方式留空会干扰到所述 UE的资源; 或
把部分 UE卸载到从基站中去, 来保证用户调度的公平性, 其中, 根据距 离延伸法来确定需要卸载至从基站中的 UE; 或
利用功率调整的方法降氏发射功率。
4、如权利要求 1所述的方法,其特征在于,在所述 UE处于高 DII区域时, 所述主基站进行调度时, 减少分配会干扰到所述 UE的资源之前, 所述方法还 包括:
所述主基站按照预先设定的接收功率门 PPNi ,搜索到第 i个从基站 PNi 所服务的接收功率大于所述接收功率门限 PPM的 UE,以搜索到受到主基站干 扰最大的 UE;
如果搜索到的 UE同时满足上述两个条件,则执行在所述 UE处于在高 DII 区域时, 所述主基站进行调度时, 减少为分配会干扰到所述 UE的资源。
5、 一种主基站, 其特征在于, 所述主基站包括:
下行干扰指示接收单元, 用于接收为用户设备 UE服务的服务从基站转发 的下行干扰指示 DII,所述 DII是附着于所述服务从基站的 UE发送至所述服务 从基站的, 当所述 DII大于预设的阈值时, 表示所述 UE处于高 DII区域;
区域判断单元, 用于根据所述 DII判断所述 UE是否处于高 DII区域; 用户调度单元, 用于如果所述 UE处于高 DII区域, 则进行调度时, 减少 分配会干扰到所述 UE的资源。
6、 如权利要求 5所述的主基站, 其特征在于, 所述用户调度单元包括: 第一调度模块,用于采用发送空子帧的方式留空会干扰到所述 UE的资源。
7、 如权利要求 5所述的主基站, 其特征在于, 所述用户调度单元还包括: 第二调度模块, 用于把部分 UE卸载到从基站中去, 来保证用户调度的公 平性, 其中, 根据距离延伸法来确定需要卸载至从基站中的 UE。
8、 如权利要求 5所述的主基站, 其特征在于, 所述用户调度单元还包括:
第三调度模块, 用于利用功率调整的方法降低发射功率。
9、 如权利要求 5所述的主基站, 其特征在于, 所述主基站还包括: 第一 UE搜索单元, 用于按照预先设定的频谱效率门限 Λ3^· , 搜索到第 i 个从基站尸^所服务的频谱效率低于所述频谱效率门限 (S^V,.的 UE, 以搜索到 受到主基站干扰最大的 UE;
第二 UE搜索单元, 用于按照预先设定的接收功率门限 PPM , 搜索到第 i 个从基站/3^所服务的接收功率大于所述接收功率门限 PPM的 UE,以搜索到 受到主基站干扰最大的 UE;
干扰判断单元, 用于如果搜索到的 UE同时满足上述两个条件, 则执行在 所述 UE处于在高 DII区域时, 所述主基站进行调度时, 减少为分配会干扰到 所述 UE的资源。
10、 一种用户调度方法, 其特征在于, 所述方法包括:
用户设备计算下行干扰指示 DII;
所述计算下行干扰指示 DII具体包括:
根据从主基站接收到的宽带主同步信号,计算得到加权宽带 /特定子带信道 质量信息 CQI; 或
根据从主基站接收到的干扰功率 P_interference和从从基站接收到的接收 功率 P_Pni计算得到 DII。
发送所述下行干扰指示 DII至从基站。
11、 如权利要求 10所述的方法, 其特征在于, 所述根据从主基站接收到的 干扰功率 P_interference和从从基站接收到的接收功率 P_Pni计算得到 DII具体 包括:
计算从主基站接收到的干扰功率 P_interference;
计算从从基站接收到的接收功率 P_PNi;
计算所述干扰功率与所述接收功率的比值 ramda;
对所述比值进行量化, 得到 DII。
12、 一种用户设备, 其特征在于, 所述用户设备包括:
DII获取单元, 用于计算下行干扰指示 DII;
所述 DII获取单元包括:
第一 DII获取模块, 用于根据从主基站接收到的宽带主同步信号, 计算得 到加权宽带 /特定子带信道质量信息 CQI; 或
第二 DII获取模块, 用于根据从主基站接收到的干扰功率 P_interference和 从从基站接收到的接收功率 P_Pni计算得到 DII;
DII发送单元, 用于发送所述下行干扰指示 DII至从基站。
13、 如权利要求 12所述的用户设备, 其特征在于, 所述第二 DII获取模块 包括:
干扰功率获取子模块,用于计算从主基站接收到的干扰功率 P_interference; 接收功率获取子模块, 用于计算从从基站接收到的接收功率 P_PNi;
比值获取子模块, 用于计算所述干扰功率与所述接收功率的比值 ramda; 量化子模块, 用于对所述比值进行量化, 得到 DII。
14、 一种异构网络, 其特征在于, 所述异构网络中包括多个从基站和如权 利要求 5至 9任一项所述的主基站, 所述从基站的编号由所述主基站分配。
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US14/611,704 US9642149B2 (en) | 2012-08-02 | 2015-02-02 | User scheduling method, master base station, user equipment, and heterogeneous network |
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US9426663B2 (en) * | 2013-06-26 | 2016-08-23 | Cable Television Laboratories, Inc. | Capacity sharing between wireless systems |
US9853667B2 (en) * | 2016-05-25 | 2017-12-26 | Apple Inc. | Noise and interference estimation for colliding neighbor reference signals |
CN111092639A (zh) * | 2019-12-25 | 2020-05-01 | 中国科学院上海微系统与信息技术研究所 | 基于大规模mimo的联合用户调度方法、功率分配方法 |
CN115474252B (zh) * | 2022-10-31 | 2023-03-14 | 煤炭科学技术研究院有限公司 | 基站切换方法、装置及矿用5g的无线组网系统 |
CN117650871B (zh) * | 2024-01-29 | 2024-04-09 | 深圳国人无线通信有限公司 | 内环mcs的计算方法及装置 |
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US8868091B2 (en) * | 2010-01-18 | 2014-10-21 | Qualcomm Incorporated | Methods and apparatus for facilitating inter-cell interference coordination via over the air load indicator and relative narrowband transmit power |
US9363038B2 (en) * | 2010-04-13 | 2016-06-07 | Qualcomm Incorporated | Evolved node B channel quality indicator (CQI) processing for heterogeneous networks |
KR20120069208A (ko) * | 2010-12-20 | 2012-06-28 | 한국전자통신연구원 | 펨토 기지국의 전송 전력 제어 방법 및 이를 적용한 장치 |
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US9642149B2 (en) | 2017-05-02 |
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