WO2009026744A1 - Procédé et dispositif de contrôle de l'attribution de ressources dans un réseau de relais sans fil - Google Patents

Procédé et dispositif de contrôle de l'attribution de ressources dans un réseau de relais sans fil Download PDF

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Publication number
WO2009026744A1
WO2009026744A1 PCT/CN2007/002611 CN2007002611W WO2009026744A1 WO 2009026744 A1 WO2009026744 A1 WO 2009026744A1 CN 2007002611 W CN2007002611 W CN 2007002611W WO 2009026744 A1 WO2009026744 A1 WO 2009026744A1
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WIPO (PCT)
Prior art keywords
mobile terminal
base station
resource
cell
relay
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PCT/CN2007/002611
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English (en)
Chinese (zh)
Inventor
Wei Zou
Xiaobing Leng
Gang Shen
Original Assignee
Alcatel Shanghai Bell Company, Ltd.
Alcatel Lucent
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Shanghai Bell Company, Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Company, Ltd.
Priority to CN200780100328.9A priority Critical patent/CN101785353B/zh
Priority to PCT/CN2007/002611 priority patent/WO2009026744A1/fr
Publication of WO2009026744A1 publication Critical patent/WO2009026744A1/fr

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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
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load

Definitions

  • the present invention relates to a wireless relay network, and more particularly to a method and apparatus for controlling resource allocation in a wireless relay network. Background technique
  • WiMAX Wireless Metropolitan Area Network Technology Based on IEEE 802.16 Standard WiMAX, as the next-generation wireless access technology for the next mile, is considered as a wireless alternative to wired broadband access technologies such as fiber and digital subscriber line DSL.
  • WiMAX not only provides line-of-sight (LOS) and non-line-of-sight (NLOS) broadband connections between mobile terminals (MS) and base stations (BS), but also supports a variety of low-latency applications such as voice and video communications.
  • LOS line-of-sight
  • NLOS non-line-of-sight
  • WiMAX can operate in the frequency band above 2 GHz, it is preferable to use the line-of-sight transmission, which makes the coverage of the base station mostly limited to the urban area, and the user data capacity drops sharply in the cell edge or the covered area. Due to the complex wireless network environment, there are many blind spots that cannot be covered by the base station.
  • the IEEE 802.16 Wireless Multi-Hop Relay (MMR) Task Force was established in March 2006 and is committed to IEEE 802.16 wireless multi-hop extension. Specifically, it introduces relay stations in WiMAX networks, which helps to increase service capacity and Improve the actual coverage of the cell, as shown in Figure 1.
  • the task group is studying the frame structure after the introduction of the relay, network access, relay selection, handover, mapping information (MAP) transmission scheme, and how the relay station reports mobile terminal information.
  • MAP mapping information
  • the base station needs to allocate resources to individual mobile terminals within its jurisdiction. Referring to FIG. 1, the base station allocates different resources to the mobile terminals a, b, and c in the cell (without the general behavior example, and assumes that the resource type is a time-frequency resource), that is, a, b, c
  • the uplink resources used for communication with the relay stations to which they belong are different or different in frequency.
  • the IEEE 802.16j standard proposes a resource reuse scheme within a cell for the wireless relay network as shown in FIG. 1, that is, different shifts in coverage areas of different relay stations.
  • Mobile terminals eg, mobile terminals &, b, c
  • allocate the same time-frequency resources e.g., mobile terminals &, b, c
  • FIG. 1 the mobile terminal b is farther from the associated relay station 2, and is a relay station.
  • the transmission power of the mobile terminal b is adjusted higher, so that the signal it sends still maintains a high strength when it reaches the adjacent relay station 1 of the relay station 2, and thus, when the relay station 1 attempts to receive from the mobile terminal a
  • the signal from the mobile terminal b causes a higher degree of interference.
  • the IEEE 802.16j standard does not mention how to reduce or eliminate the above interference. Summary of the invention
  • An object of the present invention is to improve the foregoing solution provided by the IEEE 802.16j standard, and to perform resource multiplexing in a cell to improve resource utilization while minimizing interference caused by the resource multiplexing, thereby realizing The capacity of the wireless relay network is maximized.
  • the WiMAX network based on the IEEE802.16j standard is exemplified below, the present invention is not limited to the WiMAX network, but is applicable to all types of wireless relay networks.
  • a base station divides each mobile terminal into a first or second set according to signal quality related information related to each mobile terminal in a cell under its jurisdiction, and controls to be classified into the first and second sets.
  • the mobile terminal allocates corresponding resources for communication.
  • a method for controlling resource allocation in a base station of a wireless relay network to suppress interference caused by resource multiplexing in a cell includes the following steps: a. acquiring and Signal quality related information related to each mobile terminal in the cell under the jurisdiction of the base station; b. dividing the mobile terminals into a first set and a second set based on the signal quality related information; C. controlling to belong to the first The aggregated mobile terminals allocate multiplexing resources and allocate non-multiplexed resources to mobile terminals belonging to the second set.
  • a method for assisting control resource allocation in a relay station of a wireless relay network to suppress interference caused by resource multiplexing in a cell 07 002611
  • the method includes: A. obtaining, by the base station to which the relay station belongs, indication information indicating that each mobile terminal under the relay station is divided into the first set or the second set; B. multiplexing resources of the relay station The resources in the set are allocated to the mobile terminals allocated to the first set under the relay station, and the resources in the non-multiplexed resource set are allocated to the mobile terminals belonging to the second set under the relay station.
  • a control apparatus for controlling resource allocation in a base station of a wireless relay network to suppress interference caused by resource multiplexing in a cell
  • the method includes: a signal shield quantity acquiring apparatus, And the dividing device is configured to divide the mobile terminals into a first set and a second set based on the signal quality related information; Control means, configured to control allocation of multiplexing resources for mobile terminals belonging to the first set and allocation of non-multiplexed resources for mobile terminals belonging to the second set.
  • an auxiliary control apparatus for assisting control resource allocation in a relay station of a wireless relay network to suppress interference generated by resource multiplexing in a cell, comprising: a partition acquisition apparatus, configured to: Obtaining, by the base station to which the relay station belongs, instruction information indicating that each mobile terminal under the relay station is divided into the first set or the second set; the resource allocation device, configured to use the resource in the multiplexing resource set of the relay station Each mobile terminal allocated to the first set of the relay station is allocated to the mobile terminal in the non-multiplexed resource set and allocated to each mobile terminal belonging to the second set under the relay station.
  • the present invention is applicable to a relay station (such as the relay station 3 in FIG. 1) mainly used to extend the coverage area of a base station, and a relay station (such as the relay station 1, 2) mainly used to increase the service capacity, and can be applied to centralized scheduling or distribution. Wireless relay network of the scheduling scheme.
  • the present invention is completely transparent to the mobile terminal and does not increase the terminal cost.
  • Figure 1 is a schematic diagram of a wireless relay network
  • FIG. 2a is a schematic diagram of coverage areas of two adjacent relay stations a, b in FIG. 1;
  • FIG. 2b is a signal-to-interference ratio between mobile terminals 1 on the line connecting the two relay stations shown in FIG. 2a with the mobile terminal 1 and the relay station a a graph of distance changes;
  • FIG. 3 is a flow chart of a system method for using a ranging signal to divide a mobile terminal a into a corresponding set and allocating resources in the wireless relay network shown in FIG. 1 according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a system method for re-determining a packet belonging to a mobile terminal b in a first set by using an uplink service signal in the wireless relay network shown in FIG. 1 according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram showing the result of dividing the set to which the respective mobile terminals belong according to an embodiment of the present invention
  • Figure 6a illustrates a frame structure based on centralized scheduling in a wireless relay network in accordance with a preferred embodiment of the present invention
  • Figure 6b illustrates a frame structure based on distributed scheduling in a wireless relay network in accordance with a preferred embodiment of the present invention
  • FIG. 7 is a flow chart showing a method for controlling resource allocation in a base station of a wireless relay network to suppress interference caused by resource multiplexing in a cell according to an embodiment of the present invention
  • FIG. 8 is a flowchart showing a method for assisting control resource allocation in a relay station of a wireless relay network to suppress interference caused by resource multiplexing in a cell according to an embodiment of the present invention
  • FIG. 9 is a block diagram of a control device for controlling resource allocation in a base station of a wireless relay network to suppress interference caused by resource multiplexing in a cell according to an embodiment of the present invention
  • FIG. 10 illustrates a wireless relay network in accordance with an embodiment of the present invention.
  • time-frequency resources are taken as an example for description.
  • the intra-cell resource reuse means that different network devices use the same time-frequency resource to send downlink signals to their respective served mobile terminals, or different network devices (such as base station 0 in FIG. 1 , relay station) 1-3) Receive uplink signals from their respective subordinate mobile terminals using the same time-frequency resources.
  • a network device serving a mobile terminal means that the network device directly communicates with the mobile terminal, and the network device serving the mobile terminal is hereinafter referred to as the monthly service network device of the mobile terminal. Therefore, the present invention needs to solve the co-channel interference generated by the above resource multiplexing.
  • FIG. 2a is a schematic diagram of a coverage area of two adjacent relay stations 1, 2 in FIG. 1, wherein it is assumed that the two have identical and exactly adjacent coverage areas and the coverage area radius of each relay station is r, due to the relay station 2
  • the interference the simulation result of the signal-to-interference ratio at the mobile terminal a belonging to the relay station 1 and located on the line between the two relay stations is as shown in Fig. 2b.
  • n represents the path loss factor.
  • a core idea of the present invention is to divide a mobile terminal into a first set and a second set, and allocate multiplexing resources for mobile terminals that are allocated to the first set, and allocate non-multiplex resources to mobile terminals that are allocated to the second set.
  • the multiplexing resource is specifically referred to in a base Reusable resources in a cell under the jurisdiction of the station; the non-multiplexed resources specifically refer to resources that are not multiplexable in a cell under the jurisdiction of a base station.
  • a specific resource point or resource block itself does not have reusable or non-reusable attributes, only when it is determined by the base station/relay station to be used for allocation to the first set or the second set of movements.
  • the terminal When the terminal is in the terminal, it becomes the multiplexed resource or the non-multiplexed resource within the validity period of the resource allocation.
  • the manner in which the base station divides the set to which the mobile terminal belongs includes but is not limited to: initial division and periodic division, which are respectively described below.
  • the mobile terminal a is externally moved into the cell by the cell under the jurisdiction of the base station 0, and remains in the shutdown state during this process.
  • the mobile terminal a is powered on in the cell, in step I it will routinely send an initial ranging signal.
  • the base station 0 and the relay stations 1-3 shown in Fig. 1 may all receive the ranging signal transmitted by the mobile terminal a, and only the relay stations 1, 2 are shown in Fig. 3 for the sake of simplicity.
  • step II the base station 0 and each relay station respectively measure the signal quality of the ranging signal to obtain signal quality related information, such as RSSI (received signal strength indication) or SNR (signal to noise ratio), in this example Take RSSI as an example.
  • RSSI received signal strength indication
  • SNR signal to noise ratio
  • the relay stations 1 - 3 report their respective RSSIs to the base station 0.
  • the base station 0 comprehensively analyzes the signal quality between each relay station and the mobile terminal a, and the signal shield between itself and the mobile terminal a, in order to select the service network device for the mobile terminal a, for example, if one The serving network device of the mobile terminal is the base station 0, and then the mobile terminal will directly communicate with the base station 0 without relaying; if the serving network device of a mobile terminal is a certain relay station, then the mobile terminal and the base station thereafter The communication will be relayed by the relay. It is assumed here that the RSSI reported by the relay station 1 indicates the highest signal quality, and thus the serving network device of the mobile terminal a is determined as the relay station 1.
  • the base station 0 needs to divide the mobile terminal a into an appropriate set according to a strategy such as: when a plurality of (hereinafter, two are exemplified) signals detected by the network device from the ranging signal of the mobile terminal a When the quality is basically the same, divide it into the second set.
  • a strategy such as: when a plurality of (hereinafter, two are exemplified) signals detected by the network device from the ranging signal of the mobile terminal a When the quality is basically the same, divide it into the second set.
  • the two network devices detect that the signal quality from the mobile terminal a is substantially the same, which typically means that the mobile terminal a is in the middle of the two network devices. Referring to FIG. 2a, it is assumed that the relay stations a, b detect The signal quality of the ranging signals is basically the same.
  • base station 0 divides it into the second set in step IV.
  • step V the base station 0 will control to allocate the time-frequency resource (non-multiplexed resource) corresponding to the set to which the mobile terminal a is located. Specifically, it is assumed that the time-frequency resource obtained by the mobile terminal a is T1F1. During the period of the secondary resource allocation, there is no other mobile terminal using T1F1 within the cell under the jurisdiction of base station 0.
  • the scheduling manner in the wireless relay network is divided into centralized scheduling (by the base station allocating resources for all mobile terminals in the cell) and distributed scheduling (each mobile terminal served by the relay station under its jurisdiction) Allocating resources, the base station allocates resources to other mobile terminals).
  • centralized scheduling by the base station allocating resources for all mobile terminals in the cell
  • distributed scheduling each mobile terminal served by the relay station under its jurisdiction
  • Allocating resources the base station allocates resources to other mobile terminals.
  • the base station 0 determines that the base station 0 itself is the serving network device of the mobile terminal. And as in the above, the mobile terminal is divided into the second set, and the non-multiplexed resources in the own cell are allocated thereto.
  • the base station 0 finds that the signal quality between the mobile terminal b and the relay station 2 is good, and exceeds the mobile terminal b and other relay stations and base stations.
  • the signal quality between 0 is at least a third predetermined threshold (the person skilled in the art can determine the threshold value without the inventive effort to teach under the teachings herein). This typically means that the mobile terminal b is in a position closer to the relay station 2.
  • the mobile terminal b will be assigned to the first set.
  • base station 0 will control to allocate multiplex resources within its own cell, such as T 2 F 2 .
  • the determination is made by the base station 0 itself.
  • the mobile terminal will also be divided into the first set and use the multiplexing resources in the own cell.
  • the mobility of mobile terminals determines that their service network devices are not static. Therefore, in wireless networks, especially wireless relay networks, periodic ranging is very important. Similarly, the set to which mobile terminals belong should not be static. Therefore, after the mobile terminal is divided into the corresponding set and starts normal communication after the initial ranging, the base station 0 can adaptively adjust the serving network device of the mobile terminal and its attribution based on the ranging signal periodically sent by the mobile terminal thereafter. Collection.
  • the division process based on the periodic ranging signal is similar to the initial division process described above, and will not be described herein.
  • the mobile terminals that are divided into the first and second sets after the previous division are respectively illustrated as follows:
  • the uplink time-frequency resource used is T2F2
  • T2F2 For the mobile terminal b allocated to the first set (the uplink time-frequency resource used is T2F2), it will use T2F2 to transmit the uplink service signal to the relay station 2, and at the same time, assume that the mobile terminal c and the mobile terminal b under the jurisdiction of the relay station 3
  • the T2F2 is multiplexed to transmit an uplink traffic signal to the relay station 3.
  • the uplink service signal sent by the mobile terminal c becomes interference at the relay station b, and can be indicated by the SINR.
  • the relay station 2 After receiving the uplink traffic signal sent by the mobile terminal b in step 1, the relay station 2 will detect the signal to interference and noise ratio of the received signal in step 2. In step 3, the relay station 2 reports its detected signal to interference and noise ratio to the base station 0. After learning the signal to interference and noise ratio between the mobile terminal b and the relay station 2, the base station 0 can perform the re-division of the set to which the mobile terminal b belongs based on the following policy:
  • the mobile terminal b should be classified into the second set. It is understood by those skilled in the art that after the control in step 5 allocates the non-multiplexed resources in the own cell to the mobile terminal b, the mobile terminal b will no longer suffer or cause any interference in the cell.
  • the base station 0 will still be the mobile terminal. b remains in the first set.
  • the time-frequency resource (T1F1) used by it is not multiplexed by any other mobile terminal, the time-frequency resource of T1F1 is for the relay station 2 3, 3, and base station 0 can be considered as idle, that is, the relay stations 2, 3, and base station 0 need not serve any mobile terminal on the current frequency resource.
  • the re-dividing process of the set of the mobile terminal a belonging to the second set may be implemented in the following manner: the mobile terminal a sends an uplink service signal; and the base station 0 and the relay station 1-3 both transmit signals of the uplink service signal.
  • a wide range of measurements are made to obtain signal quality related information (eg, RSSI or SNR); base station 0 aggregates the signal quality related information measured by each network device, and then divides the mobile terminal into corresponding sets.
  • signal quality related information eg, RSSI or SNR
  • base station 0 aggregates the signal quality related information measured by each network device, and then divides the mobile terminal into corresponding sets.
  • FIG. 5 schematically shows a specific embodiment according to the present invention. The division result of the set to which each mobile terminal belongs is described, wherein the area enclosed by the dotted line is the area under the jurisdiction of the network device. In this example, each mobile terminal in the area defined by the solid circle will be assigned to the first episode. And each mobile terminal outside the area defined by the realization circle will be divided into the second set.
  • the manner in which the base station obtains signal quality related information related to the mobile terminal in the present invention is not limited to detecting the signal quality of the ranging signal from the mobile terminal, for example, the function may be transmitted by each network device via a specific channel.
  • a dedicated signal of the ranging signal (each network device identifies the dedicated signal sent by the respective characteristic information), and the mobile terminal detects the signal quality of the dedicated signal and feeds back to the base station, and the base station according to the mobile terminal The signal quality indicated is fed back to the first or second set.
  • base station 0 In the centralized scheduling mode, base station 0 needs to allocate resources in person for all mobile terminals in its jurisdiction.
  • the time-frequency resources allocated to a mobile terminal belonging to the second set are not repeatedly allocated to any other mobile terminal in the cell.
  • the time-frequency resources allocated to a mobile terminal belonging to the second set (assuming that the serving network device is the base station 0) can be further allocated to one or more network devices other than the base station 0 (for example, the relay station 1, 2, 3) The mobile terminal being served.
  • network devices other than the base station 0 for example, the relay station 1, 2, 3
  • time-frequency resources are not multiplexed between mobile terminals of a network device.
  • the base station 0 In the distributed scheduling mode, the base station 0 only needs to allocate specific time-frequency resources for each mobile terminal it serves. For the mobile terminals served by each relay station, the resource allocation is completed by the corresponding relay station.
  • the base station 0 determines a multiplex resource set for multiplexing between mobile terminals belonging to the first set under the jurisdiction of each network device, and notifies the multiplexed resource set to each of the relay stations under its jurisdiction.
  • the base station 0 separately determines different non-multiplexed resource sets for each relay station and itself, and notifies the corresponding relay station for the non-multiplexed resource set determined by each relay station. Thereafter, base station 0 and each relay station determine the corresponding determination of base station 0.
  • the time-frequency resources in the non-multiplexed resource set are allocated to their respective served mobile terminals that are assigned to the second set.
  • the present invention provides a preferred frame format for centralized scheduling and distributed scheduling, respectively, as shown in Figures 6a and 6b.
  • the downlink resource multiplexing access domain is used for downlink communication between the mobile terminal belonging to the first set and the base station or the relay station to which it belongs, and is preferably located at the end of the downlink subframe; Uplink communication between the mobile terminal of the first set and the base station or the relay station to which it belongs, and preferably located at the beginning of the uplink subframe, so that the downlink data received by the relay station can be directly sent to the access domain through the downlink resource multiplexing Users, the data received by the uplink resource multiplexing access domain can also be sent to the base station in the same frame uplink, which helps reduce the delay.
  • the uplink access domain (existing) is used for uplink communication between the mobile terminal belonging to the second set and the base station or the relay station to which it belongs, and the downlink access domain (existing) is used for the mobile terminal belonging to the second set and its associated Downlink communication between base stations or relay stations.
  • the downlink resource multiplexing access domain further includes a mapping information part for each relay station to inform the mobile terminal under its jurisdiction. The resources assigned to it.
  • the base station 0 divides each mobile terminal in the cell under its jurisdiction into the two sets, and performs corresponding resource allocation based on the division result.
  • the intra-cell load does not reach or exceed the second predetermined threshold, it is still preferred to use the resource allocation manner in the existing wireless network, that is, to allocate different time-frequency resources for each mobile terminal.
  • FIG. 7 illustrates a flow of a method for controlling resource allocation to suppress interference caused by resource multiplexing in a cell in a base station of a wireless relay network according to an embodiment of the present invention.
  • step S10 the base station 0 acquires load related information in the cell under its jurisdiction, such as the number of mobile terminals in the cell, the occupancy of the system resources, and the like.
  • step S11 the base station 0 determines, according to the obtained cell load related information, whether the load of the cell is greater than or equal to a second predetermined threshold. Specifically, it can be determined whether the number of mobile terminals in the cell meets or exceeds a predetermined value; or, it can be determined whether the allocated amount of resources in the cell has reached or exceeded a corresponding predetermined value.
  • the method preferably enters a process in which the base station controls to allocate resources to each mobile terminal in the cell according to the prior art, and the centralized scheduling is taken as an example, and the base station itself is in the cell. All mobile terminals allocate different time-frequency resources.
  • step S12 when the result of the judgment indicates that the load in the cell is heavy, in order to alleviate the tight resource pressure in the cell, resource multiplexing needs to be performed in the cell. Specifically, the method proceeds to step S12.
  • step S12 the base station 0 receives the signal quality related information reported by the relay stations 1, 2, 3, and measures the signal quality between itself and a plurality of nearby mobile terminals.
  • the base station 0 will receive the signal quality related information from the mobile terminal (if necessary, relayed by the relay station).
  • the base station 0 divides each mobile terminal in the cell into a first set and a second set based on the signal quality related information, specifically, when the signal quality of the ranging signal is used to perform the division of the set. If the signal quality between a mobile terminal and two network devices is substantially the same and is significantly stronger than the signal quality between the mobile terminal and other network devices, the mobile terminal is divided into the second set, otherwise, the A collection. And when the signal quality of the mobile terminal that is currently in the first set is determined again according to the signal quality of the uplink service signal, if the signal quality of the uplink signal from the mobile terminal detected by the network device to which the mobile terminal belongs is detected Below the first predetermined threshold, it is divided into a second set.
  • each mobile terminal can be fully integrated into the first set or the second set.
  • the base station 0 controls to allocate the resources corresponding to the set to which the respective mobile terminals belong. Specifically, the resources allocated by the mobile terminals allocated to the second set are not multiplexed by any other mobile terminal in the cell before the next resource allocation.
  • step S14 is implemented by the following sub-steps:
  • the base station 0 notifies the corresponding relay station of the indication information for indicating the set into which each mobile terminal is assigned. Since the serving network device of each mobile terminal is determined in advance by the base station 0, the base station 0 has the ability to know all the network devices to which the mobile terminal belongs at this time, so that the belonging set of each mobile terminal can be accurately notified to its serving relay station.
  • the base station 0 determines, for each relay station and itself, a multiplexed resource set and a non-multiplexed resource set for downward allocation. Specifically, taking the relay station 1 shown in FIG. 1 as an example, the base station 0 determines that the relay station 1 is different from the non-multiplexed set determined for other relay stations or base stations 0 to ensure that the relay station 1 serves the services based on the non-multiplexed set.
  • the resources allocated by the second set of mobile terminals can be different from the resources allocated by other relay stations or other mobile terminals belonging to the second set served by the base station 0 for each of them.
  • the multiplex resource set determined by the base station 0 can be the same for each relay station and base station 0.
  • the base station determines the time-frequency resource set ⁇ T1F1, T2F2, . . . TnFn ⁇ as the multiplex resource set, and then each of the relay stations and the base station 0 allocates the time-frequency resources in the set to the subordinates thereof.
  • the collection of mobile terminals Of course, no multiplexing of time-frequency resources is performed between mobile terminals served by a network device.
  • the base station 0 only needs to notify the corresponding relay station of the determined non-multiplexed resource set and the multiplexed resource set.
  • step S11 is performed after step S12, and then the step S13 should be correspondingly For example, when the intra-cell load is greater than or equal to a second predetermined threshold, each mobile terminal is divided into a first set and a second set based on signal quality related information related to each mobile terminal.
  • the base station does not consider the load situation in the cell, but always applies the resource allocation based intra-cell interference suppression scheme provided by the present invention. Therefore, the steps S10 and S11 are optional.
  • FIG. 8 is a flow chart showing a method for assisting in controlling resource allocation to suppress interference caused by resource multiplexing in a cell in a relay station of a wireless relay network, in accordance with an embodiment of the present invention. Take the relay station 1 shown in Fig. 1 as an example.
  • step S20 the relay station 1 obtains signal quality related information between it and a plurality of mobile terminals in the vicinity. Specifically, when the signal quality measurement is performed on the basis of the ranging signal, the step S20 is implemented by detecting the signal quality (e.g., RSSI or SNR) of the ranging signal from the mobile terminal. For a mobile terminal belonging to the first set, if the relay station 1 relies on the signal quality measurement of the uplink service signal, the step S20 detects the signal to interference and noise ratio (SINR) of the uplink service signal from the mobile terminal. achieve.
  • SINR signal to interference and noise ratio
  • step S21 the relay station 1 reports the signal quality related information it has obtained with respect to the plurality of mobile terminals to the base station 0 to which it belongs.
  • the signal quality related information reported by the relay station 1 is identified by the feature information of the corresponding mobile terminal.
  • base station 0 will divide each mobile terminal within its jurisdiction into the first and second sets based on its collected signal quality related information, and control the allocation of resources thereto.
  • the focus on distributed scheduling is as follows:
  • the relay station 1 obtains, from the base station 0, indication information indicating that each mobile terminal under the jurisdiction of the relay station 1 is assigned to the first or second set, and the indication information is used for each mobile station by the relay station 1
  • the terminal allocates the appropriate resources.
  • the relay station 1 In order to allocate resources to mobile terminals, the relay station 1 also needs to know which resources are available for allocation to mobile terminals in the first set, and which resources can be used for allocation to the second The mobile terminal in the collection. Therefore, in step S23, the relay station 1 acquires the multiplex resource set determined by the base station 0 and the non-multiplexed resource set determined specifically for the relay station 1 from the base station 0.
  • the relay station 1 allocates the resources in the multiplexed resource set to the mobile terminals belonging to the first set that it occupies, and allocates the resources in the non-multiplexed set to the second set that it administers. Each mobile terminal. Thereafter, the mobile terminal can communicate with the relay station 1.
  • FIG. 9 is a block diagram of a control device for controlling resource allocation in a base station of a wireless relay network to suppress interference due to resource multiplexing within a cell, in accordance with an embodiment of the present invention.
  • the control device 10 shown is located at the base station 0 in Fig. 1, and includes: a signal quality obtaining device 100, a dividing device 101, a distribution control device 102, a dividing notification device 103, a load information acquiring device 104, and a judging device 105.
  • the allocation control device 102 specifically includes: a multiplexing determining device 1020, a multiplexing notification device 1021, a non-multiplexing determining device 1022, and a non-multiplexing notifying device 1023.
  • the load information obtaining device 104 acquires load related information in a cell under the jurisdiction of the base station 0, such as the number of mobile terminals in the cell, the occupancy of the system resources, and the like.
  • the acquired load related information is supplied to the judging means 105.
  • the judging means 105 judges whether the load of the cell is greater than or equal to a second predetermined threshold based on the cell load related information. Specifically, it can be determined whether the number of mobile terminals in the cell meets or exceeds a predetermined value; or, it can be determined whether the allocated amount of resources in the cell meets or exceeds a corresponding predetermined value.
  • the base station 0 preferably controls the allocation of resources for each mobile terminal in the cell based on the prior art. Taking the centralized scheduling as an example, the allocation control device 102 is specifically All mobile terminals in the cell are assigned different time-frequency resources.
  • the judging device 105 when the judgment result obtained by the judging device 105 indicates that the load in the cell is heavy, in order to alleviate the resource pressure in the cell, resource multiplexing needs to be performed in the cell. Specifically, the judging device 105 notifies the signal quality of the obtained judgment result. The device 100 is acquired.
  • the signal quality obtaining apparatus 100 After learning that the intra-cell load is high, the signal quality obtaining apparatus 100 receives the relay station. 1, 2, 3 report signal quality related information, and measure the signal quality of multiple mobile terminals near base station 0. When the measurement of the signal shield is completed by the mobile terminal instead of the relay station or the base station, the signal quality acquisition device 100 will receive signal quality related information from the mobile terminal (if necessary relayed by the relay station). The signal quality obtaining means 100 notifies the dividing means 101 of the acquired signal quality related information relating to each mobile terminal in the cell.
  • the dividing device 101 divides each mobile terminal in the cell into a first set and a second set based on the signal quality related information, specifically, when the signal quality of the ranging signal is used to perform the dividing of the set, if If the signal quality between a mobile terminal and two network devices is substantially the same and is significantly stronger than the signal quality between the mobile terminal and other network devices, the mobile terminal is divided into the second set, otherwise, the first set is divided. . And when the signal quality of the mobile terminal that is currently in the first set is determined again according to the signal quality of the uplink service signal, if the signal quality of the uplink signal from the mobile terminal detected by the network device to which the mobile terminal belongs is detected Below the first predetermined threshold, it is divided into a second set.
  • each mobile terminal can be fully integrated into the first set or the second set.
  • the distribution control device 10 needs to control the allocation of resources corresponding to the respective sets to which the respective mobile terminals belong. Specifically, resources allocated to the mobile terminal of the second set are not reused by any other mobile terminal in the cell until the next resource allocation. It can be seen that, in the case of centralized scheduling, the division notification device 103 and each sub-device of the distribution control device 102 are optional, and the functions of the distribution control device 102 are mainly: based on the division device 101 for each mobile terminal belonging to the collection As a result of the partitioning, the respective mobile terminals are allocated appropriate resources.
  • the sub-devices that need to divide the notification device 103 and the distribution control device 102 perform the following operations. :
  • the division notification means 103 notifies the corresponding relay station of the indication information for indicating the set to which the respective mobile terminals are divided. Since the serving network device of each mobile terminal is determined in advance by the base station 0, the base station 0 has the ability to know that all the mobile terminals belong at this time. The network device can thereby accurately notify the service relay station of the belonging set of each mobile terminal.
  • Multiplexing determining means 1020 and a non-multiplexing apparatus 1022 are responsible for determining the relay stations and the base station 0 determines itself down for multiplexing resource allocated multiplexing resources set and non-set. Specifically, taking the relay station 1 shown in FIG. 1 as an example, the non-multiplexing determining means 1022 determines a non-multiplexed set different from other relay stations or base stations 0 for the relay station 1 to ensure that the relay station 1 serves it based on this non-multiplexed set.
  • the resources allocated by the mobile terminals belonging to the second set can be different from the resources allocated by other relay stations or other mobile terminals belonging to the second set served by the base station 0 for each of them.
  • the multiplex resource set determined by the multiplexing determining means 1020 can be the same for each relay station and base station 0.
  • the base station determines the time-frequency resource set ⁇ T1F1, T2F2, ... TnFn ⁇ as the multiplex resource set, and then each of the relay stations and the base station 0 allocates the time-frequency resources in the set to the subordinates thereof.
  • the multiplexing of time-frequency resources is not performed between mobile terminals served by a network device.
  • the determined multiplexing resource set and the non-multiplexed resource set are notified to the corresponding relay station by the multiplexing notification means 1021 and the non-multiplexing notifying means 1023.
  • the selection of the service network device of the mobile terminal is It is necessary to rely on the signal quality measurement result of the ranging signal, and the determination operation of the determination device 105 can be performed after the signal quality obtaining device 100 acquires the signal quality related information, and then the dividing device 101 will be responsible for: when the intra-cell load is greater than or equal
  • each mobile terminal is divided into a first set and a second set based on signal shield related information related to each mobile terminal.
  • FIG. 10 is a block diagram of an auxiliary control device for assisting in controlling resource allocation to suppress interference generated by resource multiplexing in a cell in a relay station of a wireless relay network according to an embodiment of the present invention.
  • the auxiliary control device 20 is shown at each of the relay stations shown in Fig. 1, hereinafter taking the relay station 1 as an example.
  • the auxiliary control device 20 includes: a segmentation acquisition device 200, a resource allocation device 201, a resource set acquisition device 202, an acquisition device 203, and a reporting device 204.
  • signal quality related information related to a plurality of mobile terminals is obtained by the obtaining means 203 at the relay station 1. Specifically, when the signal quality measurement is performed on the basis of the ranging signal, the obtaining means 203 detects the signal quality (e.g., RSSI or SNR) of the ranging signal from the plurality of mobile terminals in the vicinity of the relay station 1. For a mobile terminal belonging to the first set, if the relay station 1 relies on the signal quality measurement of the uplink traffic signal, the obtaining means 203 detects the signal to interference and noise ratio (SINR) of the uplink traffic signal from the mobile terminal. The obtaining means 203 supplies the signal quality related information obtained by it to the reporting means 204.
  • SINR signal to interference and noise ratio
  • the obtained signal quality related information related to the plurality of mobile terminals is reported to the base station 0 by the reporting device 204.
  • the reported signal quality related information is identified by the feature information of the corresponding mobile terminal.
  • the base station 0 will divide each mobile terminal within its jurisdiction into the first and second sets based on the collected signal quality related information, and control the allocation of resources thereto.
  • the focus on distributed scheduling is as follows:
  • the division obtaining means 200 obtains, from the base station 0, indication information indicating that the respective mobile terminals under the jurisdiction of the relay station 1 are assigned to the first or second set, and the indication information is used for allocating appropriate mobile terminals for the mobile terminal by the relay station 1. Resources.
  • the relay station 1 In order to allocate resources to mobile terminals, the relay station 1 also needs to know which resources can be used for allocation to mobile terminals in the first set, and which resources can be used for allocation to mobile terminals in the second set. Therefore, the resource set obtaining means 202 acquires the multiplex resource set determined by the base station 0 and the non-multiplexed resource set determined specifically for the relay station 1 from the base station 0.
  • the resource allocation device 201 allocates resources in the multiplexed resource set to Each of the mobile terminals belonging to the first set under its jurisdiction, and the resources in the non-multiplexed set are allocated to the respective mobile terminals of the second set of the dependents under its jurisdiction. Based on this, the mobile terminal can communicate with the relay station 1.
  • the function of the relay station is basically the same as that of the existing relay station, and will not be described again.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Dans le réseau de relais sans fil existant, une station de base attribue différentes ressources temps-fréquence aux stations mobiles dans une cellule, et celles-ci sont restreintes lorsque la charge de la cellule est élevée. Ceci étant, il est proposé une nouvelle façon d'attribuer une ressource, qui consiste en ce que la station de base divise les stations mobiles dans la cellule en le premier ensemble et le second ensemble, et réalise le contrôle pour attribuer les ressources de multiplexage aux stations mobiles dans le premier ensemble, ainsi que les ressources de démultiplexage aux stations mobiles dans le second ensemble ; par conséquent, l'interférence peut être restreinte tout en réalisant un multiplexage de ressources dans la cellule, et la capacité de la cellule peut être maximisée.
PCT/CN2007/002611 2007-08-31 2007-08-31 Procédé et dispositif de contrôle de l'attribution de ressources dans un réseau de relais sans fil WO2009026744A1 (fr)

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CN200780100328.9A CN101785353B (zh) 2007-08-31 2007-08-31 无线中继网络中的资源分配控制方法及装置
PCT/CN2007/002611 WO2009026744A1 (fr) 2007-08-31 2007-08-31 Procédé et dispositif de contrôle de l'attribution de ressources dans un réseau de relais sans fil

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CN101883363B (zh) * 2009-05-08 2013-05-22 电信科学技术研究院 一种资源分配方法、装置及***
CN101925078B (zh) * 2009-06-10 2012-11-21 华为技术有限公司 中继***资源复用的方法和网络侧设备
CN101925067B (zh) * 2009-06-10 2013-03-20 华为技术有限公司 中继***资源复用的方法和网络侧设备
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CN104684042A (zh) * 2015-03-13 2015-06-03 深圳酷派技术有限公司 物联网中的数据传输方法、***、物联网设备、终端
CN104684042B (zh) * 2015-03-13 2019-02-01 深圳酷派技术有限公司 物联网中的数据传输方法、***、物联网设备、终端
CN107432025A (zh) * 2015-03-25 2017-12-01 索尼移动通讯有限公司 蜂窝网络中的调度
CN107432025B (zh) * 2015-03-25 2021-09-17 索尼集团公司 节点及其执行的方法、中继节点及其执行的方法
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