WO2011038556A1 - 在无线中继网络中确定小区间干扰的方法及装置 - Google Patents
在无线中继网络中确定小区间干扰的方法及装置 Download PDFInfo
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- WO2011038556A1 WO2011038556A1 PCT/CN2009/074360 CN2009074360W WO2011038556A1 WO 2011038556 A1 WO2011038556 A1 WO 2011038556A1 CN 2009074360 W CN2009074360 W CN 2009074360W WO 2011038556 A1 WO2011038556 A1 WO 2011038556A1
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004891 communication Methods 0.000 claims abstract description 117
- 230000002452 interceptive effect Effects 0.000 claims description 32
- 238000007726 management method Methods 0.000 claims description 10
- 238000013468 resource allocation Methods 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000005562 fading Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
Definitions
- the present invention relates to wireless communication systems, and more particularly to wireless relay networks. Background technique
- each cell of the wireless network usually uses the same frequency resource, which may cause a transmitter of a certain cell to transmit to a neighboring signal with a certain frequency.
- the cell generates inter-cell interference for a receiver in the neighboring cell that receives the signal of the own cell at the frequency. Therefore, the inter-cell interference problem has become an important issue that must be solved.
- a key point to solve this problem is to estimate the SINR (signal to interference and noise ratio) size in a certain subframe in the future, such as CQI (channel quantity identification).
- SINR signal to interference and noise ratio
- link adaptation, multi-user scheduling, HARQ (hybrid automatic retransmission), etc. can be performed.
- the base station A in a certain cell transmits a downlink signal with a constant power (for example, 46 dBm), and the user equipment UE in another cell is interfered with by the signal transmitted by the base station A as an example: (UE) measures the SINR in a certain subframe under the influence of the interference, and feeds it back to the base station to which the user equipment belongs. Since the power of the downlink signal transmitted by the base station A is constant, the user equipment of the neighboring cell is The statistical characteristics of the interference caused by the (UE) mainly depend on the change of the channel fading.
- a constant power for example, 46 dBm
- the base station B can use the statistical characteristics of the channel fading and the SINR of each resource block in a certain subframe fed back by the user equipment, and use the interference.
- the estimated method estimates the SINR of a certain resource block in another subframe in the future. In particular, for two subframes with an interval smaller than the channel coherence time, the measured SINR values on the same frequency are the same.
- multi-hop relay technology has been widely discussed in the LTE-A (Advanced Long Term Evolution) standard and has been introduced into the 3GPP standard.
- LTE-A Advanced Long Term Evolution
- 3GPP 3rd Generation Partnership Project
- the relay station is in a half-duplex working state and cannot be simultaneously received. hair.
- the base station eNB 1 transmits downlink data to the relay station RN 1 at a certain operating frequency; in another subframe, the relay station RN 1 is in the same work.
- the downlink data is sent to the user equipment UE 1 on the frequency.
- the base station eNB 1 when the cooperative relay mode between the base station and the relay station is not used, in order to avoid mutual interference, when the relay station RN 1 forwards data to the UE 1, the base station eNB 1 usually does not transmit data but is in a silent state at the same working frequency.
- the interference source of the interference received by a certain cell is not only the base station of the interfering cell, but may be interfered by any one of the potential interference sources of the base station and the relay station or a combination thereof.
- the following line transmission is taken as an example.
- Figs. 1 and 2 in the cell C1, one frequency resource is alternately allocated to the base station eNB 1 and the relay station RN 1. As shown in FIG.
- the frequency is allocated to the base station eNB 1 on the subframe 1 for downlink communication on the backhaul link to the relay station RN 1, and the downlink signal is applied to the base station eNB 2 of the neighboring cell 2, and the relay station RN 2 A certain interference is generated with the user equipment UE 2.
- the frequency is allocated to the relay station RN 1 for downlink communication on the access link to the user equipment UE 1, the downlink signal to the base station eNB 2 of the neighboring cell, and the relay station The RN 2 and the user equipment UE 2 generate some interference.
- the transmission power of the base station and the relay station are quite different.
- the transmission power of the base station is 46 dBm in the standard, and the relay station is 30 dBm; they also have different distances to neighboring cells, so their interference to neighboring cells is also It's not the same. This leads to great uncertainty in the interference experienced by neighboring cells.
- the applicant simulated the network operation under the condition of no relay and relay under the full load (full buffer) service model (the wireless network parameters based on the simulation are shown in Figure 4). Under two conditions, 10 users are polled (Round obm) for monthly service.
- Figure 3 shows the coefficient of variation (the ratio of the standard deviation of SINR to the SINR mean) for each user's SINR for 10 users over a time window of 90 ms. It can be seen that the coefficient of variation under the relay condition is high, which means that the SINR fluctuation is large when there is a relay, which results in even if the SINR of a certain subframe is accurately measured, and the statistical characteristics according to the coefficient of variation are also It is difficult to accurately estimate the future SINR. Therefore, the occurrence of relays in the neighboring cells has generated quite serious interference uncertainty problems.
- the traditional estimation method cannot accurately estimate the dry ⁇ and SINR, which directly affects link adaptation, multi-user scheduling, Work such as HARQ (Hybrid Automatic Repeat) reduces system performance. How to determine inter-cell interference under the condition of relaying has become an important issue that needs to be solved by wireless technologies such as LTE-A.
- a method for determining inter-cell interference received by a communication device of a local cell in a communication management device of a wireless relay network including the following steps: a first information, where the first information is used to indicate a specific interference source in the interfering cell to which at least one specific communication resource is respectively allocated in an interfering cell; 11. determining, according to the specific interference source, the Inter-cell interference from the interfering cell that the communication device is subjected to on the particular communication resource.
- a method for determining an inter-cell interference by a communication management device for a cell that is interfered by a cell in a base station of a wireless relay network includes the following steps: I. at least one communication The resources are respectively allocated to at least part of the communication devices in the cell; II. providing a first information to the base station to which the cell interfered by the cell belongs, the first information indicating that the at least one communication resource is separately located in the cell The communication device assigned to it.
- a device for determining inter-cell interference received by a communication device of a local cell in a communication management device of a wireless relay network includes: a receiver, configured to receive a first Information, the first information is used to indicate a specific interference source in the interfering cell to which at least one specific communication resource is respectively allocated in an interfering cell; determining means, configured to determine, according to the specific interference source, Inter-cell interference from the interfering cell that the communication device is subjected to on the particular communication resource.
- a device for assisting a communication management device of a cell interfered by a cell in a base station of a wireless relay network to determine inter-cell interference includes: a resource allocation device, At least one communication resource is respectively allocated to at least part of the communication device in the local cell; the transmitter is configured to provide a first information to the base station to which the cell interfered by the cell belongs, and the first information indicates the at least one communication resource
- the source is the communication device to which the cell is allocated.
- a base station of a cell causing interference notifies a communication device to which a communication resource is allocated in the cell to a base station of the interfered cell, and the base station of the interfered cell is determined to cause interference on the communication resource.
- FIG. 1 is a schematic diagram showing inter-cell interference caused by downlink communication to neighboring cells in subframe 1 in a half-duplex relay wireless network;
- FIG. 2 is a schematic diagram showing inter-cell interference caused by downlink communication to neighboring cells in subframe 2 in a half-duplex relay wireless network;
- Figure 3 shows the coefficient of variation of the user SINR obtained by simulating a wireless communication network under both relayed and unrelayed conditions
- FIG. 4 shows the parameters of the wireless communication network on which the simulation in FIG. 3 is based;
- FIGS. 5 to 7 respectively show that in subframes 1, 2 and 3, cells C1 and C1' cause a cell to the neighboring cell C2.
- FIG. 8 shows a flow diagram of a method of determining inter-cell interference in accordance with an aspect of the present invention
- Figure 9 is a graph showing normalized user throughput of the present invention and prior art in a polled mode of service
- Figure 10 shows a plot of the normalized user throughput of the present invention and prior art in a proportional fair service mode.
- the base station eNB 2 in the cell C2 determines the subframe 1.
- Embodiments of the present invention are described by taking the inter-cell interference caused by neighboring cells CI and CI' in 2 and 3 as an example.
- the cell C1 includes a base station eNB 1 , a relay station RN 1 and a user equipment UE 1.
- the base station eNB 1 comprises a base station eNB 2 for assisting the cell C2 interfered by the own cell to determine inter-cell interference, the device comprising a resource allocation device 10 and a transmitter 11.
- the cell Cl includes a base station eNB ⁇ , a relay station RN ⁇ and a user equipment UE ⁇ .
- the base station eNB ⁇ includes a base station eNB 2 for assisting the cell C2 interfered by the own cell to determine inter-cell interference, the device comprising a resource allocation device 10, and a transmitter 11'.
- the cell C2 includes a base station eNB 2, a relay station RN 2 and a user equipment UE 2.
- the base station eNB 2 comprises a device 2 comprising a receiver 20 and a determining means 21.
- step S10 the base station eNB 1 and the relay station RN 1 in the resource allocation area of the base station eNB 1 are allocated.
- the allocation is based on channel quality, long-term service information, the number of user equipments that the base station eNB 1 and the relay station RN 1 respectively access, and the like.
- the number of downlink resource blocks occupied by the base station eNB 1 and the relay station RN 1 is proportional to the number of user equipments respectively accessed by them.
- the allocation is semi-static, and the result of the allocation will remain allocated for a period of time. This technical solution will be described in detail later.
- the base station eNB 1 uses the allocated downlink resource block for the base station eNB 1 to directly transmit the downlink data to the administered relay station RN 1 and the user equipment UE. According to the link quality of the backhaul link (between the base station eNB 1 and the relay station RN 1 ) and the access link (between the relay station RN 1 and the user equipment UE 1 ), the downlink resource block occupied by the relay station RN 1 will seek and return The number of resource blocks on the link is matched to maximize resource utilization.
- the resource allocation in units of resource blocks is equivalent to resource allocation in units of subframes. It is to be understood that the present invention is not limited thereto, and allocation in units of resource blocks in a subframe is also within the scope of protection of the present invention, which will be described later.
- step S10 the resource allocation device 10 allocates subframe 1 to the base station eNB 1, For transmitting downlink data to the relay station RN 1 on the backhaul link; assigning the subframe 2 to the relay station RN 1 for transmitting the downlink data to the user equipment UE 1; and determining that the traffic is not full due to the insufficient traffic Use subframe 3.
- the base station eNB 1 notifies the relay station RN 1 of the allocation result via the Un interface.
- the transmitter 11 provides a first information to the base station eNB 2 to which the cell C2 interfered by the cell belongs, through the inter-base station interface (such as the X2 interface), where the first information indicates that the subframes 1 and 2 are in the cell.
- the base station eNB 1 and the relay station RN 1 respectively allocated to each other also indicate that the subframe 3 is not allocated for use in the own cell.
- the first information also similarly includes the allocation of other subframes in the scheduling period, and other subframes are not described here for the sake of brevity.
- the resource allocation device 10' of the base station eNB l ' of the interfering cell C1 assigns subframes 1 and 2 to the relay station RN, and transmits downlink data to the user equipment on the access link.
- the base station eNB ⁇ transmitter 1 ⁇ transmits the first information 'to the base station eNB 2, where the first information ' indicates the communication devices to which the subframes 1, 2 and 3 are allocated within the cell C1 '.
- subframe 1 is assigned to base station eNB 2 for transmitting downlink data to relay station RN 2 on the backhaul link; subframes 2 and 3 are all assigned to relay station RN 2.
- the access link is used to send downlink data to the user equipment UE 2.
- the base station eNB 2 determines the respective interference sources from the interfering cells C1 and C1' through the first information and the first information, and respectively determines the interference caused by each interference source to the communication device in the subframe, and finally The total interference received by the communication device or the SINR of the communication device under total interference is calculated.
- step S20 the receiver 20 of the base station eNB 2 receives the first information, and according to the information, determines that the subframe 1 is allocated to the base station eNB 1 in the cell C1, and the subframe 2 is used. It is allocated to the relay station RN 1 in the cell C1, and the subframe 3 is not allocated for use in the cell C1.
- the base station eNB 2 can set a logical table to indicate that the subframes 1, 2 and 3 are small Whether the zone CI is allocated for use and what communication device is assigned to it.
- the base station eNB 2 can establish the logical table for each of the relay stations and the user equipment.
- each relay station and the user equipment receive the same interference from the cell C1 in the same subframe, it is not necessary to separately establish the logic table for each relay station and the user equipment.
- step S21 the determining means 21 determines whether the inter-cell interference from the cell C1 received by the communication device using each subframe in the own cell is determined according to whether or not each subframe is allocated for use and which communication device is used.
- the determining means 21 is allocated to the eNB 1 in the cell C1 according to the subframe 1, and the interference caused by the eNB 1 in the subframe 1 to the relay station RN 2 is estimated.
- the base station eNB 2 controls the relay station RN 2 to measure the interference power mean and statistical characteristics generated by the base station eNB 1 for the RN 2 on the subframe preceding the subframe 1.
- the relay station RN 2 can perform measurement by a signal such as a pilot transmitted by the eNB 1.
- the determining means 21 obtains the measured interference power mean and statistical characteristics, and estimates the power of the interference caused by the base station eNB 1 to the relay station RN 2 in the subframe 1 by using a commonly used interference estimating method. It can be understood that interference estimation based on the mean and statistical characteristics of the interference power is well known to those skilled in the art, and methods such as Wiener filtering can be used, and the present invention will not be described herein.
- the determining means 21 determines the distance between the relay station RN 2 and the base station eNB 1 and determines the transmission power of the base station eNB 1 as specified in the standard
- the determining means 21 calculates the power of the interference caused by the base station eNB 1 to the relay station RN 2 in the subframe 1 by calculating the attenuation after transmitting the distance by the radio signal according to the relative distance and the transmission power.
- the inter-cell interference from the interfering cell C1 received by the relay station RN 2 on the subframe 1 is determined.
- the determining means 21 is allocated to the RN 1 in the cell C1 according to the subframe 2, (according to the interference characteristics obtained by the UE 2 measuring the pilot transmitted by the RN 1, Or the attenuation is calculated according to the distance between RN 1 and UE 2 and the transmission power of RN 1 (30 dBm).
- the interference / ⁇ 3 ⁇ 4 / 2 caused by RN 1 to user equipment UE 2 in subframe 2 is estimated.
- the base station eNB 2 determines in step S20' that the relay station RN 2 receives the interference from the relay station RN ⁇ on the subframe 1, and determines that the user equipment UE 2 is in the subframe. Interference from the relay station RN ⁇ received on 2 and 3, and similarly to step S21, in step S21', the base station eNB 2 determines, respectively, the cell C1 received by the communication device in subframes 1, 2 and 3, / w — 2 and /: — 3 .
- the base station eNB 2 can calculate the total interference received by the receiver, and further calculate the SINR of the receiver in the case of total interference.
- W TM — is the useful signal power of the i-th subframe of the i-th subframe of the receiver of the i-th subframe, S subfmmej i-th subframe, and R is the noise power.
- the base station eNB 2 performs link adaptation for each subframe based on the SINR in each subframe, and performs operations such as multi-user scheduling, HARQ (hybrid automatic retransmission), and the like according to each subframe.
- operations such as multi-user scheduling, HARQ (hybrid automatic retransmission), and the like according to each subframe.
- Methods for performing these operations in accordance with SINR are well known to those of ordinary skill in the art, and the present invention will not be described herein.
- the cell C1 determines that the coordinated operation mode is adopted in the subframe 2, that is, the relay station RN 1 and the base station eNB 1 synchronously transmit the downlink signal to the user equipment UE 1 at the same frequency, and the two downlink signals are superimposed to generate a gain.
- the relay station RN 1 and the base station eNB 1 are both specific interference sources of the user equipment UE 2 in the cell C2.
- the base station eNB 1 informs the base station eNB 1 that the subframe 2 relay station RN 1 and the base station eNB 1 are in the first information, and the base station eNB 2 acquires the user equipment UE 2 before the subframe 2 through the relay station RN 1 and the base station eNB.
- the transmitted pilot measurement obtains the respective interferences of the two, and the interference generated by the relay station RN 1 and the base station eNB 1 in the subframe 2 to the user equipment UE 2 is respectively estimated by the interference estimation method, and further combined with other specific interference sources.
- the generated interference together calculates the SINR of the user equipment UE 2 at subframe 2.
- the cell C2 adopts a centralized control mode, and the base station eNB 2 is responsible for the backhaul link and the access link. Therefore, the base station eNB 2 calculates the SINR of the RN 2 in the subframe 1 and performs the backhaul. The link is adapted; and the SINR of UE 2 is calculated in subframes 2 and 3, and the access link is adapted.
- the cell C2 adopts a distributed control manner, the base station eNB 2 is only responsible for the backhaul link, and is not responsible for the access link, and the relay station RN 2 is responsible for accessing the link.
- the base station eNB 2 calculates the SINR of the RN 2 at subframe 1, adapts the backhaul link, and it also provides the first information to the relay station RN 2. Similar to steps S20 and S21 above, the relay station RN 2 receives the first information from the base station eNB 2, determines the interference sources of the respective cells C1 and C1' that interfere with the UE 2 in the subframes 2 and 3, and determines the interference source generation. The interference is calculated by calculating the SINR of UE 2 in subframes 2 and 3, and then performing other operations such as adaptation of the access link.
- the frequency domain width of the unit resource block in the subframe is the entire frequency band, and therefore, the "subframe" is described as a unit communication resource.
- the base station eNB 1 and the eNB ⁇ allocate respective resource blocks to at least a part of the communication devices in the own cell, and indicate that the first information of the communication devices to which the respective resource blocks are respectively allocated in the own cell are provided to the base station. eNB 2.
- the base station eNB 2 determines the inter-cell interference from the cells C1 and cr received on the resource block according to the communication device to which the cells C1 and C1' on the resource block are allocated, that is, the specific interference source. After that, the traffic of the cell C1 (or C1 ') may change. At intervals, the base station eNB 1 (or eNB ⁇ ) will re-allocate the radio resources to suit the traffic change and redistribute. The result informs the cell C2.
- the base station eNB 1 acquires a change ⁇ (e.g., in bits) of the amount of information of the communication information buffered by the relay station RN 1. And in step S12, based on the change amount ⁇ and the change threshold, it is determined to increase, maintain, or reduce the number of resource blocks allocated to the relay station.
- a change ⁇ e.g., in bits
- the number of resource blocks reassigned to the relay station RN 1 The relationship between X' and the number of resource blocks X previously assigned to the relay station RN 1 is: ⁇ 7
- max N m bits _perRB is the maximum amount of information that each resource block can carry (for example, using the highest-order modulation method supported by the system), and the operator " ⁇ is for it. Value ⁇ Round up.
- step S13 the base station eNB 2 re-allocates the X resource blocks to the relay station in the next scheduling period according to the determined number of resource blocks X that the relay station increases, maintains, or decreases, and allocates the remaining resource blocks. Give this base station.
- the base station eNB 2 provides the new first information to the base station eNB 2 to which the cell C2 belongs by, for example, the X2 interface, and the new first information indicates that each resource block in a certain scheduling time is re-established in the cell C1.
- the first information may be a communication device corresponding to each of the newly allocated resource blocks, or may be a communication device corresponding to each of the resource blocks that have changed after the last allocation.
- the base station eNB 2 that receives the new first information will determine the interference from the cell C1 received by the communication device on each resource block according to the specific interference source of the new resource block in the cell C1, and re-establish the link. Adaptation and other operations. Upon completion, the base station eNB 2 will feed back an acknowledgment message back to the base station eNB 1.
- the base station eNB 1 After receiving the acknowledgment message, the base station eNB 1 instructs the communication device in the own cell to communicate according to the reassigned resource.
- the base station eNB 1 may transmit the first information to all cells in the entire wireless communication network, or may also transmit to a partial cell to which primary interference (e.g., neighboring) may be generated.
- the partial cell can be filtered by the interference from the cell C1 actually received by each cell and a preset interference threshold.
- Figure 9 shows a plot of normalized user throughput for the present invention and prior art in a polled mode of service. It can be seen that the normalized throughput of the present invention is higher than the prior art under the same probability conditions.
- Figure 10 shows a plot of user throughput for the present invention and prior art in a proportional fair service mode. It can be seen that the normalized throughput of the present invention is higher than the prior art under the same probability conditions.
- Table 1 below shows the average user throughput of the cell in the above two service modes of the prior art and the present invention:
- Table 2 below shows the cell user throughput of the prior art and the present invention in the above two service modes:
- the cell average throughput and the cell edge user throughput of the present invention are higher than the prior art under the two service modes.
- the present invention is not limited to the downlink communication of the cell C2 on the backhaul link and the access link, and is also applicable to the uplink communication in the access link and the backhaul link to determine the relay station RN 2 or the base station eNB 2 Interference.
- the present invention is not limited to the case of the two-hop relay mentioned, and it can be applied to the case of three-hop and three-hop relays.
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Description
在无线中继网络中
确定小区间干扰的方法及装置 技术领域
本发明涉及无线通信系统, 尤其涉及无线中继网络。 背景技术
由于目前为 3G、 4G等无线通信系统颁发的频带资源十分有限, 因 此无线网络的各个小区通常使用相同的频率资源, 这就可能导致某一小 区的发射机以一定频率的发射信号散播到相邻小区, 对相邻小区内以该 频率接收本小区信号的接收机产生小区间干扰。 因此, 小区间干扰问题 成为了一个必须解决的重要问题, 解决这一问题的一个关键之处是估计 出在将来某一子帧中的 SINR (信干噪比) 大小, 如 CQI (信道 量标 识), 根据 SINR才能进行链路适配, 多用户调度、 HARQ (混合式自动 重传) 等等工作。
在 3GPP中, 已经对这一问题进行了一定研究, 并提出了一定的解 决方案。 在 LTE (长期演进)标准中, 某一小区内的基站 A以恒定的功 率 (例如 46dBm )发射下行信号, 以另一小区内的用户设备 UE受到该 基站 A发射的信号干扰为例: 用户设备(UE ) 测量在该干扰影响下的 某一子帧内的 SINR, 并将其反馈给本用户设备所属的基站 由于基站 A发射下行信号的功率是恒定的, 因此其对相邻小区的用户设备(UE ) 造成的干扰的统计特性主要取决于信道衰落的变化, 所以, 基站 B可以 才艮据信道衰落的统计特性, 以及用户设备反馈的某一子帧中的各个资源 块的 SINR, 采用干扰估计的方法估计出在将来另一子帧中的某一资源 块的 SINR。 特别地, 对于间隔小于信道相干时间内的两个子帧, 在同 一频率上所测量得到的 SINR值 本相同的。
目前, 多跳中继技术在 LTE-A (先进的长期演进)标准中得到了广 泛的讨论, 并且已经被引入到 3GPP标准中。 在多跳中继技术中, 通常 假定中继站处于半双工 (Half-duplex ) 的工作状态, 不能够同时进行收
发。 以下行为例, 在某一小区 C1中, 在一个子帧中, 基站 eNB 1在一 定工作频率上将下行数据发送给中继站 RN 1 ; 在之后的另一个子帧中, 中继站 RN 1在相同的工作频率上将该下行数据发送给用户设备 UE 1。 并且, 当不采用基站和中继站间的协作中继方式时,为了避免相互干扰, 在中继站 RN 1转发数据给 UE 1时,基站 eNB 1在相同的工作频率上通 常不再发送数据而处于静默状态。 发明内容
在有中继的情况下, 考虑小区间干扰问题, 某个小区受到的干扰 的干扰源不在仅仅是干扰小区的基站, 而可能受到基站和中继站这些 潜在干扰源中的任一个或其组合的干扰。 以下行传输为例, 如图 1和 图 2所示, 在小区 C1中, 一个频率资源被交替地分配给基站 eNB 1 和中继站 RN 1。 其中, 如图 1所示, 该频率在子帧 1上被分配给基 站 eNB 1进行回传链路上至中继站 RN 1的下行通信, 该下行信号对 相邻小区的基站 eNB 2、中继站 RN 2和用户设备 UE 2产生一定干扰。 在之后的子帧 2上, 如图 2所示, 该频率被分配给中继站 RN 1进行 接入链路上至用户设备 UE 1的下行通信, 该下行信号对相邻小区的 基站 eNB 2、 中继站 RN 2和用户设备 UE 2产生一定干扰。
基站和中继站的发射功率有较大差别, 例如基站的发射功率在标 准中规定是 46dBm, 而中继站是 30dBm; 它们对于相邻小区的距离 也有较大不同, 因此它们对相邻小区产生的干扰也就不尽相同。 这导 致相邻小区受到的干扰具有很大的不确定性。 申请人在满负荷 (Full buffer ) 业务模型下对无中继和有中继两种条件下的网络运行进行了 仿真 (仿真所基于的无线网络参数如图 4所示)。 在两种条件下, 对 10个用户采用轮询 (Round obm ) 的方式进行月良务。 图 3示出了在 90ms的时间窗口内 10个用户各自的用户 SINR的变异系数(SINR的 标准差与 SINR均值之比)。可以看出,有中继条件下的变异系数较高, 这意味着有中继时 SINR的波动很大, 这导致即使准确地测量得到了 某一子帧的 SINR, 根据该变异系数统计特性也很难准确地估计将来
的 SINR。 所以, 中继的出现在相邻小区内产生了相当严重的干扰不 确定问题, 采用传统的估计方法无法准确地估计干 ·ί尤和 SINR, 这直 接影响了链路适配, 多用户调度、 HARQ (混合式自动重传) 等工作, 降低了系统性能。如何在有中继的条件下确定小区间干扰,成为了 LTE-A 等无线技术需要解决的一个重要问题。
为了解决这一问题, 根据本发明的一个方面, 提供了一种在无线 中继网络的通信管理设备中用于确定本小区的通信设备受到的小区 间干扰的方法, 包括如下步骤: 1. 接收一个第一信息, 所述第一信息 用于指示至少一个特定通信资源在一干扰小区中被分别分配给的所 述干扰小区内的特定干扰源; 11. 根据所述特定干扰源, 确定所述通 信设备在所述特定通信资源上受到的来自所述干扰小区的小区间干 扰。
根据本发明的另一个方面, 提供了一种在无线中继网络的基站中 用于辅助受本小区干扰的小区的通信管理设备确定小区间干扰的方 法, 包括如下步骤: I. 将至少一个通信资源分别分配给本小区内的至 少部分通信设备; II. 将一个第一信息提供给受本小区干扰的小区所 属的基站, 所述第一信息指示所述至少一个通信资源在本小区内被分 别分配给的通信设备。
根据本发明的第三个方面, 提供了一种在无线中继网络的通信管 理设备中用于确定本小区的通信设备受到的小区间干扰的设备, 包 括: 接收机, 用于接收一个第一信息, 所述第一信息用于指示至少一 个特定通信资源在一干扰小区中被分别分配给的所述干扰小区内的 特定干扰源; 确定装置, 用于根据所述特定干扰源, 确定所述通信设 备在所述特定通信资源上受到的来自所述干扰小区的小区间干扰。
根据本发明的第四个方面, 提供了一种在无线中继网络的基站中 用于辅助受本小区干扰的小区的通信管理设备确定小区间干扰的设 备, 包括: 资源分配装置, 用于将至少一个通信资源分别分配给本小 区内的至少部分通信设备; 发射机, 用于将一个第一信息提供给受本 小区干扰的小区所属的基站, 所述第一信息指示所述至少一个通信资
源在本小区内被分别分配给的通信设备。
根据本发明的实施例, 造成干扰的小区的基站将通信资源在该小 区内被分配给的通信设备告知受到干扰的小区的基站, 受到干扰的小 区的基站得以确定该通信资源上该造成干扰的小区的干扰源, 并根据 该干扰源确定该造成干扰的小区将会造成的小区间干扰, 这解决了干 扰不确定问题。 附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描 述, 本发明的以上及其它特征、 目的和优点将会变得更加明显:
图 1示出了半双工中继无线网络中, 在子帧 1中, 下行通信对相 邻小区造成小区间干扰的示意图;
图 2示出了半双工中继无线网络中, 在子帧 2中, 下行通信对相 邻小区造成小区间干扰的示意图;
图 3示出了在有中继和无中继两种条件下对无线通信网络进行仿 真得到的用户 SINR的变异系数;
图 4示出了图 3中的仿真所基于的无线通信网络的参数; 图 5至图 7分别示出了在子帧 1、 2和 3中, 小区 C1和 C1 '对相 邻小区 C2造成小区间干扰的示意图;
图 8示出了根据本发明一个方面, 确定小区间干扰的方法的流程 图;
图 9示出了在轮询的服务方式下, 本发明和现有技术的归一化用 户吞吐量的曲线;
图 10示出了在比例公平的服务方式下, 本发明和现有技术的归 一化用户吞吐量的曲线。
附图中, 相同或者相似的附图标识代表相同或者相似的部件。 具体实施方式
以下参照图 5至图 8 , 以小区 C2中的基站 eNB 2确定在子帧 1、
2和 3中相邻小区 CI和 CI '造成小区间干扰为例对本发明的实施例进 行描述。
小区 C1包括基站 eNB 1 , 中继站 RN 1和用户设备 UE 1。 基站 eNB 1包括用于辅助受本小区干扰的小区 C2的基站 eNB 2确定小区 间干扰的设备 1 , 该设备包括一个资源分配装置 10和一个发射机 11。 小区 Cl,包括基站 eNB Γ , 中继站 RN Γ和用户设备 UE Γ。基站 eNB Γ包括用于辅助受本小区干扰的小区 C2的基站 eNB 2确定小区间干 扰的设备, 该设备包括一个资源分配装置 10,和一个发射机 11 '。 小区 C2包括基站 eNB 2, 中继站 RN 2和用户设备 UE 2。基站 eNB 2包括 设备 2, 该设备包括一个接收机 20和一个确定装置 21。
如图 8所示, 首先, 在步骤 S10中, 基站 eNB 1的资源分配装置 区内的基站 eNB 1和中继站 RN 1。 该分配是基于信道质量、 长期的 业务信息、 基站 eNB 1和中继站 RN 1分别接入的用户设备数量等等 因素。
初始阶段, 基站 eNB 1和中继站 RN 1分别占有的下行资源块数 量和它们分别接入的用户设备数量成正比。 该分配是半静态的, 分配 结果将保持一段时间后再次进行分配, 该技术方案在后文中将进行详 细描述。
基站 eNB 1使用所分配的下行资源块用于基站 eNB 1将下行数据 直接发送给所辖中继站 RN 1 和用户设备 UE。 根据回传链路(基站 eNB 1和中继站 RN 1之间) 和接入链路(中继站 RN 1和用户设备 UE 1之间) 的链路质量, 中继站 RN 1 占有的下行资源块将力求与回 传链路上的资源块数目相匹配, 以求最大化资源利用率。
在本实施例中, 简便而不失一般性, 假定一个单位资源块的频域 宽度是整个频带, 则以资源块为单位的资源分配就等效为以子帧为单 位的资源分配。 可以理解, 本发明并不限于此, 以子帧中的资源块为 单位进行分配同样处于本发明的保护范围内, 在后文中将进行描述。
在步骤 S10中, 资源分配装置 10将子帧 1分配给基站 eNB 1,
用于在回传链路发送下行数据给中继站 RN 1 ; 将子帧 2分配给中继 站 RN 1 , 用于接入链路发送下行数据给用户设备 UE 1 ; 并由于业务 量不饱满, 确定不分配使用子帧 3。
在小区 C1 中, 基站 eNB 1将该分配结果通过 Un接口通知中继 站 RN 1。
在步驟 S11 中, 发射机 11将一个第一信息通过基站间接口 (如 X2接口 )提供给受本小区干扰的小区 C2所属的基站 eNB 2, 该第一 信息指示子帧 1和 2在本小区内被分别分配给的基站 eNB 1和中继站 RN 1 , 还指示子帧 3在本小区内没有被分配使用。 当然, 除了子帧 1、 2和 3之外, 该第一信息中还类似地包括调度时段内的其他子帧的分 配情况, 这里为简明起见不对其他子帧进行描述。
对于干扰小区 Cl,, 与以上步骤 S10类似地, 干扰小区 Cl,的基 站 eNB l ' 的资源分配装置 10'将子帧 1和 2分配给中继站 RN Γ在接 入链路发送下行数据给用户设备 UE Γ;将子帧 3分配给中继站 RN 1 ' 在回传链路中发送上行数据给基站 eNB Γ。 基站 eNB Γ的发射机 1 Γ 将第一信息'发送给基站 eNB 2, 其中第一信息 '指示了子帧 1、 2和 3 在本小区 C1 '内分配给的通信设备。
对于子帧 1、 2和 3 , 在小区 C2中, 子帧 1被分配给基站 eNB 2, 用于在回传链路发送下行数据给中继站 RN 2; 子帧 2和 3都被分配 给中继站 RN 2, 用于接入链路发送下行数据给用户设备 UE 2。 对于 各个子帧, 基站 eNB 2通过该第一信息和第一信息,确定来自干扰小 区 C1 和 C1 '的各自的干扰源, 并分别确定各干扰源在子帧中对通信 设备造成的干扰, 最后计算出通信设备受到的总的干扰或在总的干扰 下的通信设备的 SINR。
具体的, 对于干扰小区 Cl, 在步骤 S20中, 基站 eNB 2的接收 机 20接收到该第一信息,并根据该信息确定子帧 1在小区 C1中被分 配给基站 eNB 1使用, 子帧 2在小区 C1中被分配给中继站 RN 1使 用, 子帧 3在小区 C1中没有被分配使用。
基站 eNB 2可以设定一个逻辑表, 分别标明子帧 1、 2和 3在小
区 CI 中是否被分配使用, 以及分配给什么通信设备使用。 优选地, 基站 eNB 2 可以为每一个中继站和用户设备分别建立该逻辑表。 当 然, 各个中继站和用户设备在同一子帧中受到的来自小区 C1 的干扰 相同的情况下, 不需要为每一个中继站和用户设备分别建立该逻辑 表。
在步驟 S21 中, 确定装置 21根据各子帧是否被分配使用, 以及 分配给什么通信设备使用, 确定本小区内使用各子帧的通信设备受到 的来自小区 C1的小区间干扰。
对于子帧 1来说,确定装置 21根据子帧 1在小区 C1 内被分配给 eNB 1, 对 eNB 1在子帧 1中对中继站 RN 2造成的干扰进行估计。
在一个实施例中, 基站 eNB 2控制中继站 RN 2在子帧 1之前的 子帧上测量基站 eNB 1对 RN 2产生的干扰功率均值以及统计特性。 中继站 RN 2可以通过 eNB 1发送的导频等信号进行测量。 确定装置 21获取到测量得到的干扰功率均值和统计特性,采用常用的干扰估计 方法, 估计出基站 eNB 1在子帧 1上对中继站 RN 2造成的干扰的功 率。 可以理解, 根据干扰功率的均值和统计特性进行干扰估计是本领 域的一般技术人员所熟知的, 例如维纳滤波等方法都可以使用, 本发 明在此不做赘述。
在另一个实施例中, 确定装置 21确定中继站 RN 2和基站 eNB 1 之间的距离, 并确定基站 eNB 1 的发射功率, 例如标准中规定的
46dBm。 而后, 确定装置 21 才艮据相对距离和发射功率, 通过计算无 线信号传输该距离后的衰减,计算出基站 eNB 1在子帧 1上对中继站 RN 2造成的干扰的功率 ―。
则对于子帧 1来说, 中继站 RN 2在子帧 1上受到的来自干扰小 区 C1的小区间干 得以确定。 对于子帧 2来说, 与以上两个实施例 类似地, 确定装置 21根据子帧 2在小区 C1 内被分配给 RN 1 , (根据 UE 2测量 RN 1发送的导频而得到的干扰特性, 或根据 RN 1和 UE 2 之间的距离以及 RN 1的发射功率 30dBm计算衰减)对 RN 1在子帧 2中对用户设备 UE 2造成的干扰 /∞¾/ 2进行估计。 对于子帧 3来说,
确定用户设备 UE 2在子帧 3上不受干扰小区 C1的小区间干扰, 即 一。。
对于干扰小区 Cl,, 与步驟 S20类似地, 基站 eNB 2在步驟 S20' 中确定中继站 RN 2在子帧 1上受到的来自中继站 RN Γ的干 ·ί尤, 并 确定用户设备 UE 2在子帧 2和 3上受到的来自中继站 RN Γ的干扰 而后, 与步驟 S21类似地, 在步驟 S21 '中, 基站 eNB 2分别确定在子 帧 1、2和 3中通信设备受到的来自小区 Cl,的 ,/w — 2和/: — 3。
而后, 在步骤 S22中, 对于子帧 1、 2和 3中, 基站 eNB 2可以 内接收机受到的总的干扰, 进而计算出在总的干扰情况下接收机的 SINR。 具体的, 如下公式所表述: 膽 匿」· = - ~~ S hf:ameJ ,z≡ { 2,3} ( i )
subframej subframe
其中, W ™— ,是第 i子帧的接收机在第 i子帧的 SINR, Ssubfmmej 第 i子帧的有用信号功率, R是噪声功率。
而后, 基站 eNB 2根据各个子帧中 SINR, 对各个子帧分别进行链 路适配, 根据各个子帧进行多用户调度、 HARQ (混合式自动重传)等 等操作。 根据 SINR进行这些操作的方法是本领域的一般技术人员所熟 知的, 本发明在此不故赘述。
在另一种情况下, 小区 C1确定在子帧 2中采用协同工作方式, 即 中继站 RN 1和基站 eNB 1以相同频率同步地向用户设备 UE 1发送下行 信号, 两个下行信号叠加后产生增益。 在这种情况下, 中继站 RN 1和 基站 eNB 1都是小区 C2中的用户设备 UE 2的特定干扰源。与上述方法 类似的, 基站 eNB 1在第一信息中将子帧 2中继站 RN 1和基站 eNB 1 告知基站 eNB 2, 基站 eNB 2获取用户设备 UE 2在子帧 2之前通过中 继站 RN 1和基站 eNB 1发射的导频测量得到两者各自的干扰, 并通过 干扰估计方法, 分别估计出中继站 RN 1和基站 eNB 1在子帧 2中对用 户设备 UE 2产生的干扰, 并进一步与其他特定干扰源产生的干扰一起 计算出子帧 2时用户设备 UE 2的 SINR。
在以上的实施例中, 小区 C2采取一种集中式的控制方式, 由基站 eNB 2负责回传链路和接入链路, 因此基站 eNB 2计算子帧 1时 RN 2 的 SINR, 对回传链路进行适配; 并计算子帧 2和 3时 UE 2的 SINR, 对接入链路进行适配。 在另一个实施例中, 小区 C2是采用分布式的控 制方式, 基站 eNB 2仅负责回传链路, 不负责接入链路, 中继站 RN 2 负责接入链路。在这个实施例中,基站 eNB 2计算子帧 1时 RN 2的 SINR, 对回传链路进行适配, 它还将第一信息提供给中继站 RN 2。 与以上步骤 S20和 S21类似地, 中继站 RN 2接收来自基站 eNB 2的第一信息, 确 定子帧 2和 3时小区 C1和 C1 '各自的对 UE 2造成干扰的干扰源, 并确 定干扰源产生的干扰, 计算出子帧 2和 3时 UE 2的 SINR, 继而进行接 入链路的适配等其他操作。 在以上实施中, 子帧中的单位资源块的频域宽度是整个频带, 因 此以 "子帧,, 作为单位通信资源进行说明。 可以理解, 当子帧中包括 多个资源块时, 资源块作为单位通信资源,基站 eNB 1和 eNB Γ将各 个资源块分别分配给本小区内的至少部分通信设备, 并指示各个资源 块在本小区内被分别分配给的通信设备的第一信息提供给基站 eNB 2。基站 eNB 2根据资源块上的小区 C1和 C1 '中被分配给的通信设备, 也就是特定干扰源, 确定在资源块上受到的来自小区 C1 和 cr的小 区间干扰。 在一段时间后, 小区 C1 (或 C1 ' )的业务量可能会发生变化, 则每 隔一段时间, 基站 eNB 1 (或 eNB Γ )将对无线资源重新进行分配, 以 适合业务量的变化, 并将重新分配的结果告知小区 C2。
具体的,基站 eNB 1获取中继站 RN 1所緩存的通信信息的信息量 的变化 Δ (例如以 bit为单位)。 并在步骤 S12中, 才艮据该变化量△和 变化阈值, 确定增加、 维持不变或减少分配给中继站的资源块数量。
其中, 和7是两个正的阈值, max N m bits _perRB是每一个资源块能够 承载的最多的信息量 (例如使用系统支持的最高阶的调制方式), 运 算符「·Ί是对其中的值 ·进行上取整。
而后, 在步骤 S13中, 基站 eNB 2根据所确定的中继站增加、 维 持不变或减少的资源块数量 X,, 在下一调度周期内将 X,个资源块重 新分配给中继站, 将剩余资源块分配给本基站。
接着, 在步骤 S14中, 基站 eNB 2将新的第一信息通过例如 X2 接口提供给小区 C2所属的基站 eNB 2, 新的第一信息指示一定调度 时间内的各个资源块在小区 C1 内被重新分配给的通信设备。 在实际 系统中, 第一信息可以是重新分配的各个资源块分别对应的通信设 备, 也可以是相对于上一次分配后发生变化的部分资源块分别对应的 通信设备。
收到新的第一信息的基站 eNB 2将会根据新的各个资源块的在小 区 C1 中的特定干扰源, 确定在各个资源块上通信设备受到的来自小 区 C1的干扰, 并重新进行链路适配等操作。 在完成后, 基站 eNB 2 将反馈一确认消息回基站 eNB 1。
在基站 eNB 1接收到该确认消息后, 它指示本小区内的通信设备 按照该重新分配的资源进行通信。
在实际系统中, 基站 eNB 1可以将第一信息发送给整个无线通信 网络中的所有小区,也可以发送给可能对其产生主要干扰(例如相邻) 的部分小区。 该部分小区可以通过各个小区实际受到的来自小区 C1 的干扰和一个预先设置的干扰阈值筛选出来。 申请人对本发明的实施例的性能和现有技术的性能进行了仿真
比较, 仿真基于的无线通信网络的参数如图 4所示。 图 9示出了在轮 询的服务方式下, 本发明和现有技术的归一化用户吞吐量的曲线。 可 以看出,在相同概率的条件下,本发明的归一化吞吐量比现有技术高。 图 10示出了在比例公平的服务方式下, 本发明和现有技术的用户吞 吐量的曲线。 可以看出, 在相同概率的条件下, 本发明的归一化吞吐 量比现有技术高。
下表 1示出了现有技术和本发明的在以上两种服务方式下的小区 平均用户吞吐量:
表 1
表 2
可以看出, 在两种服务方式下, 本发明的小区平均吞吐量和小区 边缘用户吞吐量都比现有技术高。 可以理解, 本发明并不限于小区 C2在回传链路和接入链路的下 行通信, 还适用于接入链路和回传链路中的上行通信, 以确定中继站 RN 2或基站 eNB 2受到的干扰。 并且, 本发明也不限于所举的两跳 中继的情形, 它可以适用于三跳和三跳以上中继的情形。
以上对本发明的具体实施例进行了描述, 需要理解的是, 本发明 并不局限于上述特定的实施方式, 本领域技术人员可以在所附权利要 求的范围内做出各种变型和修改。 在权利要求中, 措词 "包括" 不排 除其他的元素和步骤, 并且措辞 "一个" 不排除复数。 在发明的实际 应用中, 一个部件可能执行权利要求中所引用的多个技术特征的功 能。 权利要求中的任何附图标记不应理解为对范围的限制。
Claims
1. 一种在无线中继网络的通信管理设备中用于确定本小区的通 信设备受到的小区间干扰的方法, 包括如下步骤:
1. 接收一个第一信息,所述第一信息用于指示至少一个特定通信 资源在一干扰小区中被分别分配给的所述干扰小区内的特定干扰源;
11. 根据所述特定干扰源, 确定所述通信设备在所述特定通信资 源上受到的来自所述干扰小区的小区间干扰。
2. 根据权利要求 1所述的方法, 其特征在于, 所述特定干扰源为 所述干扰小区所含的多个潜在干扰源中的至少一个, 所述潜在干扰源 为以下任一种:
- 发送下行数据的所述干扰小区的基站;
- 发送下行数据的所述干扰小区中的中继站;
- 发送上行回传数据的所述干扰小区中的中继站;
- 发送上行数据的所述干扰小区中的用户设备。
3. 根据权利要求 2所述的方法, 其特征在于, 所述步骤 ii包括 如下步骤:
- 确定所述通信设备测量得到的、 所述特定干扰源在参考通信资 源上对所述通信设备造成的参考干扰;
- 根据所述特定干扰源造成的参考干扰, 采用干扰估计方法, 估 计出所述特定干扰源在所述特定通信资源上对所述通信设备造成的 干扰, 作为所述通信设备在所述特定通信资源上受到的来自所述干扰 小区的小区间干扰;
或包括如下步骤:
- 确定所述通信设备和所述特定干扰源之间的距离, 并确定所述 特定干扰源的发射功率;
- 根据所述相对距离和发射功率, 计算出所述特定干扰源在所述 特定通信资源上对所述通信设备造成的干扰, 作为所述通信设备在所
述特定通信资源上受到的来自所述干扰小区的小区间干扰。
4. 根据权利要求 1所述的方法, 其特征在于, 所述通信管理设备 包括基站, 所述通信设备包括所述基站和所述基站所辖的中继站和用 户设备三者中的任一个, 所述步骤 i中, 所述基站接收来自所述干扰 小区所属的基站的所述第一信息。
5. 根据权利要求 4所述的方法, 其特征在于, 所述基站辖有中继 站, 所述中继站用于确定所述中继站或所述中继站所辖的用户设备受 到的小区间干扰, 该方法还包括如下步骤:
- 将所述第一信息转发给所述中继站。
6. 根据权利要求 1所述的方法, 其特征在于, 所述通信管理设备 包括中继站, 所述通信设备包括中继站和所述中继站所辖的用户设备 两者中的任一个, 所述步驟 i中, 所述中继站接收来自所述中继站所 属的基站转发的所述第一信息, 所述第一信息由所述中继站所属的基 站从所述干扰小区所属的基站处所接收。
7. 根据权利要求 1至 6中任一项所述的方法,其特征在于, 所述 无线中继网络是基于 3GPP标准, 所述第一信息还用于指示所述特定 通信资源在所述干扰小区内没有被分配使用, 所述步骤 ii中:
- 根据所述特定通信资源在所述干扰小区内没有被分配使用, 确 定所述通信设备在所述特定通信资源上不受所述干扰小区的小区间 干扰。
8. 根据权利要求 1至 7中任一项所述的方法,其特征在于, 所述 通信设备受到来自多个干扰小区的多个特定干扰源的干扰, 对于每个 干扰源, 所述步驟 1和 11分别进行, 该方法还包括如下步骤:
- 111. 根据所述通信设备在所述特定通信资源上受到的来自所述 多个干扰小区各自的小区间干扰, 计算所述通信设备在所述特定通信 资源上受到的总的小区间干扰或信干噪比。
9. 一种在无线中继网絡的基站中用于辅助受本小区干扰的小区 的通信管理设备确定小区间干扰的方法, 包括如下步骤:
I . 将至少一个通信资源分别分配给本小区内的至少部分通信设
备;
II. 将一个第一信息提供给受本小区干扰的小区所属的基站, 所 述第一信息指示所述至少一个通信资源在本小区内被分别分配给的 通信设备。
10. 根据权利要求 9所述的方法, 其特征在于, 所述通信设备包 括以下至少任一个:
- 发送下行数据的本基站;
- 发送下行数据的所述中继站;
- 发送上行数据的所述用户设备;
- 发送上行回传数据的所述中继站。
11. 根据权利要求 9所述的方法, 其特征在于, 所述步骤 I中, 根据本基站和所述中继站直接接入的用户设备的数量, 将至少一个通 信资源按比例分配给本基站和所述中继站;
该方法还包括如下步驟:
J. 根据所述中继站所緩存的通信信息的信息量在一定时间间隔 内的变化, 和变化的阈值, 确定增加、 维持不变或减少分配给所述中 继站的通信资源量;
K. 根据所确定的所述中继站增加、 维持不变或减少的通信资源 量, 将至少一个通信资源重新分配给本基站和所述中继站;
L. 将新的第一信息提供给受小区间干扰的小区所属的基站, 所 述新的第一信息指示至少一个通信资源在本小区内被重新分配给的 通信设备;
M. 以一定时间间隔重复以上步骤 J至 L。
12. 根据权利要求 11所述的方法, 其特征在于, 所述步骤 J中: - 当所述信息量在一定时间间隔内增加的量大于一第一阈值时, 确定在每个通信资源的最大承载信息量的条件下, 发送该增加的量所 需的通信资源量, 并确定分配给所属中继站的通信资源量增加该所需 的通信资源量;
- 当所述信息量在一定时间间隔内减少的量大于一第二阈值时,
确定减半分配给所述中继站的通信资源量;
- 否则, 维持不变分配给所属中继站的通信资源量。
13. 根据权利要求 9至 12中任一项所述的方法,所述无线中继网 络是基于 3GPP标准, 所述步驟 I还包括如下步驟:
- 确定不分配使用某些通信资源;
所述第一信息还用于指示该某些通信资源在本小区内没有被分 配使用。
14. 一种在无线中继网络的通信管理设备中用于确定本小区的通 信设备受到的小区间干扰的设备, 包括:
- 接收机, 用于接收一个第一信息, 所述第一信息用于指示至少 一个特定通信资源在一干扰小区中被分别分配给的所述干扰小区内 的特定干扰源;
- 确定装置, 用于根据所述特定干扰源, 确定所述通信设备在所 述特定通信资源上受到的来自所述干扰小区的小区间干扰。
15. 一种在无线中继网络的基站中用于辅助受本小区干扰的小区 的通信管理设备确定小区间干扰的设备, 包括:
- 资源分配装置, 用于将至少一个通信资源分别分配给本小区内 的至少部分通信设备;
- 发射机, 用于将一个第一信息提供给受本小区干扰的小区所属 的基站, 所述第一信息指示所述至少一个通信资源在本小区内被分别 分配给的通信设备。
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