WO2012139472A1 - Procédé, système et équipement pour coordination de brouillage - Google Patents

Procédé, système et équipement pour coordination de brouillage Download PDF

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Publication number
WO2012139472A1
WO2012139472A1 PCT/CN2012/073480 CN2012073480W WO2012139472A1 WO 2012139472 A1 WO2012139472 A1 WO 2012139472A1 CN 2012073480 W CN2012073480 W CN 2012073480W WO 2012139472 A1 WO2012139472 A1 WO 2012139472A1
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WO
WIPO (PCT)
Prior art keywords
network side
side device
transmit power
maximum transmit
power threshold
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PCT/CN2012/073480
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English (en)
Chinese (zh)
Inventor
徐婧
潘学明
Original Assignee
电信科学技术研究院
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Publication of WO2012139472A1 publication Critical patent/WO2012139472A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • TDDD time division duplex
  • GP guard interval
  • FDD Frequency Division Duplex
  • a radio frame has a length of 10 ms and contains 10 sub-frames, including a special sub-frame and a regular sub-frame. For lms.
  • the special subframe is divided into three subframes: DwPTS (Downlink Pilot Time Slot) for transmitting PSS (Primary Synchronization Signal), PDCCH (Physical Downlink Control Channel), PHICH (Physical HARQ Indication Channel), PCFICH (Physical Control Format Indication Channel), PDSCH (Physical Downlink Shared Channel), etc.
  • DwPTS Downlink Pilot Time Slot
  • PSS Primary Synchronization Signal
  • PDCCH Physical Downlink Control Channel
  • PHICH Physical HARQ Indication Channel
  • PCFICH Physical Control Format Indication Channel
  • PDSCH Physical Downlink Shared Channel
  • the UpP Pilot (Uplink Pilot Time Slot) is used to transmit SRS (Sounding Reference Signal) and PRACH (Physical Random Access Channel). )Wait.
  • the regular subframe includes an uplink subframe and a downlink subframe, and is used for transmitting an uplink/downlink control channel and service data.
  • you can configure two special subframes in subframes 1 and 6) or a special subframe (in subframe 1).
  • Subframe 0 and subframe 5 and DwPTS subframes in special subframes are always used for downlink transmission.
  • Subframe 2 and UpPTS subframes in special subframes are always used for uplink transmission. Other subframes can be configured as needed. For uplink transmission or downlink transmission.
  • the uplink and downlink transmissions use the same frequency resource, and the uplink/downlink signals are transmitted on different subframes.
  • the division of uplink and downlink subframes is static or semi-static, and the usual practice is in the network. Planning process The ratio of the uplink and downlink subframes is determined according to the cell type and the approximate service ratio and remains unchanged. This is a relatively simple approach in the context of large coverage of macro cells, and is also more effective. With the development of technology, more and more low-power base stations such as Pico cells and Home NodeBs are deployed to provide local small coverage. In such cells, the number of users is small, and The user service requirements vary greatly. Therefore, there is a dynamic change in the proportion of uplink and downlink services in the cell.
  • the cross-slots of adjacent cells may be disturbed.
  • the femto cell In the time slot in which the macro cell transmits the downlink signal, the femto cell is used for uplink signal reception, and the base station-base station interference occurs between the two cells, and the femto base station directly receives the downlink signal of the Macro base station, and The quality of the uplink signal of the L-UE (Local UE, Local UE) is seriously affected by the femto base station.
  • the adjacent cells herein may be geographically adjacent cells (shown in Figure 1B) that use the same TDD carrier, or cells that are geographically overlapping or using neighboring TDD carriers (shown in Figure 1C). However, in the scenario where the demand for uplink and downlink services is dynamically changed, there is no solution to cross-slot interference.
  • the embodiments of the present invention provide a method, a system, and a device for performing interference coordination, which are used to reduce time slot interference in a scenario where the uplink and downlink traffic ratio requirements are dynamically changed.
  • the first network side device determines that the interference capable of controlling the second network side device is a maximum transmit power threshold value within a range that the second network side device can bear;
  • the first network side device configures the subframe n to be configured as a downlink according to the determined maximum transmit power threshold to reduce the interference of the subframe n after the configuration to the neighboring cell.
  • n is a non-negative integer.
  • a threshold value determining module configured to determine a maximum transmit power threshold value that is capable of controlling the interference of the second network side device within a range that the second network side device can bear;
  • a configuration module configured to configure, according to the determined maximum transmit power threshold, a subframe n to be configured as a downlink, to reduce interference of the subframe n to the neighboring cell after the configuration;
  • n is a non-negative integer.
  • the first network side device configures the subframe n that needs to be configured as a downlink according to a maximum transmit power threshold value within a range that the second network side device can bear by the interference control of the second network side device, thereby configuring Up and down industry
  • the slot interference caused by different uplink and downlink configurations is reduced; the system stability and performance are further improved.
  • FIG. 1A is a schematic diagram of a frame structure of a TD-LTE system
  • FIG. 1B is a schematic diagram of cross-slot interference when using the same TDD carrier
  • 1C is a schematic diagram of cross-slot interference when using adjacent TDD carriers
  • FIG. 2 is a schematic flowchart of a method for performing interference coordination according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of an apparatus for performing interference coordination according to an embodiment of the present invention.
  • the first network side device controls the maximum transmit power threshold value within the range that the second network side device can bear according to the interference that can be used for the second network side device, and needs to be configured as the downlink subframe n.
  • the configuration is performed to reduce the interference of the subframe n to the neighboring cell after the configuration, so that the slot interference caused by the difference between the uplink and downlink configurations is reduced in a scenario where the uplink and downlink traffic ratios are dynamically changed.
  • the embodiments of the present invention can be applied to a TDD system (such as a TD-LTE system), and can also be applied to other systems that need to dynamically adjust uplink and downlink configurations of a subframe, such as a TD-SCDMA system and its subsequent evolution system, WiMAX ( Worldwide Interoperability for Microwave Access, Wave Access Global Interoperability) systems and their subsequent evolution systems.
  • a TDD system such as a TD-LTE system
  • WiMAX Worldwide Interoperability for Microwave Access, Wave Access Global Interoperability
  • the method for performing interference coordination in the embodiment of the present invention includes the following steps:
  • Step 201 The first network side device determines that the interference capable of the second network side device controls a maximum transmit power threshold value within a range that the second network side device can bear.
  • the first network side device may determine the maximum transmit power threshold P in the uplink and downlink configuration of the cell; and may also determine the maximum transmit power threshold after receiving the notification from the upper layer.
  • Step 202 The first network side device configures a subframe n to be configured as a downlink according to the determined maximum transmit power threshold to reduce interference of the subframe n after the configuration to the neighboring cell; where n is a non-negative integer.
  • the first network side device may first measure the deployment of the neighboring base station, for example, determine the number of effective interfering base stations and respective RSRP (Reference Signal Receiving Power) values, and/or with the neighboring base stations.
  • Interworking base station configuration information where the configuration information includes but is not limited to at least one of the following information: transmit power, resource configuration information.
  • the first network side device needs to be restarted according to service requirements or interference effects of other cells or other reasons.
  • this configuration may cause inter-base station interference.
  • the neighboring cell subframe n is a downlink subframe
  • the first network-side device configuration subframe n is a downlink subframe, it will interfere with the receiving data. .
  • the first network side device needs to consider the interference influence to limit the configuration of this subframe.
  • the first network side device determines a maximum transmit power threshold according to device information of the first network side device and/or device information of the second network side device.
  • the first network side device determines the maximum transmit power threshold according to the device information of the second network side device or according to the device information of the first network side device and the device information of the second network side device.
  • the device information of the first network side device includes but is not limited to at least one of the following information: spectrum allocation information and resource scheduling information.
  • the device information of the second network side device includes but is not limited to at least one of the following information:
  • the path loss value between the first network side device and the second network side device The path loss value between the first network side device and the second network side device, the reference signal received power value of the second network side device, the spectrum allocation information, the resource scheduling information, the system bandwidth, and the interference tolerance value.
  • the first network side device determines the maximum transmit power threshold.
  • the following are the following: Mode 1: The first network side device is configured according to device information of each second network side device, or according to Selecting, by the device information of the first network side device and the device information of each of the second network side devices, a second network side device as a reference device from the second network side device that is around the first network side device;
  • the first network side device determines the maximum transmit power threshold P according to the device information of the reference device or according to the device information of the first network side device and the device information of the reference device.
  • the first network side device may select one second network side device as the reference device.
  • the first network side device determines the nearest second network side device as the reference device; or the first network side device determines the second network side device with the smallest path loss value as the reference device.
  • the first network side device may determine the maximum transmit power threshold according to Equation 1 or Equation 2:
  • P leg — te + max(pathloss, MCL) Equation 2; where p max is the maximum transmit power threshold; j is the first network that the second network side device can withstand
  • ACLR A ACS B where ACLR A is the adjacent channel leakage power radio of the first network side device, and B is the second network side device
  • P athloss is the path loss value
  • MCL is the most Small coupling loss value.
  • zx ⁇ aL may be a protocol agreement, or a factory setting of the device, or calculated according to actual conditions (such as the received power value of the useful signal and the demodulation gate p ⁇ value, and the acceptable interference threshold is calculated).
  • ⁇ I ⁇ UL may also refer to the resource scheduling situation selection.
  • the DL ⁇ /L is usually small, such as may be less than the noise floor.
  • AaRb "s is 0; when the interference formed by the first network side device is outside the receiving bandwidth of the second network side device, Determine ACLR and ACS according to at least one of the following ways, and determine ACIR b S -b S according to ACLR and ACS;
  • one of the methods can be used to determine a in another way to determine a ?.
  • the correspondence between the band allocation condition and the reference value and/or the correspondence between the resource scheduling situation and the reference value may be preset, and then the band allocation according to the correspondence relationship may be determined.
  • the reference value corresponding to the situation or resource scheduling situation refer to the 3GPP TS 36.101 or 3GPP TS 36.104 protocol.
  • the correspondence between the frequency band allocation and the empirical value and/or the correspondence between the resource scheduling situation and the empirical value may be preset, and then the frequency band may be determined according to the corresponding relationship.
  • pat ⁇ can be obtained by measurement, or by signaling interaction, or a combination of both.
  • This value includes factors such as penetration loss, antenna gain, and so on.
  • the MCL can be empirically valued (simulated), or factory configured, or agreed upon by the agreement.
  • the first network side device separately determines a maximum transmit power value allowed by each interfered cell according to information about multiple interfered cells, and selects a maximum transmit power value as the maximum transmit power threshold. Specifically, the first network side device determines the surrounding area according to the device information of each of the surrounding second network side devices, or according to the device information of the first network side device and the device information of each of the surrounding second network side devices. a maximum transmit power gate P ⁇ value corresponding to each second network side device;
  • the first network side device selects a maximum transmit power threshold from the determined plurality of maximum transmit power thresholds. When selected, the first network side device can randomly select one. Preferably, the first network side device selects a minimum one of the maximum transmit power thresholds.
  • the first network side device may also determine the maximum transmit power threshold according to the formula 1 or the formula 2.
  • the maximum transmit power threshold For the specific content, refer to the corresponding part of the mode, and details are not described herein again.
  • embodiments of the present invention are not limited to the above two manners, and other manners for determining the maximum transmit power threshold value around the first network side device are also applicable to the embodiments of the present invention.
  • the second network side device that is located around the first network side device may be all the network side devices that are around the first network side device; or may be around the first network side device and interfered by the first network side device. Network side device.
  • the first network side device may determine the network side device that is interfered by the first network side device in the following manner: the first network side device measures the uplink and downlink configuration information of the surrounding network side device, and further determines the network that causes the cross slot interference. Side equipment; or
  • the surrounding network device signals the uplink and downlink configuration information of each device in the network around the first network side device, and further determines the network side device that causes the cross slot to be disturbed; or
  • the first network side device notifies the surrounding network side device of its own uplink and downlink configuration or pre-configuration signaling, and the surrounding network side device determines whether cross-slot interference is formed according to the information, and feeds back whether the information is subject to interference.
  • the embodiment of the present invention is not limited to the foregoing manner, and other embodiments capable of determining the network side device that is interfered by the first network side device are applicable to the embodiment of the present invention.
  • the first network side device compares the maximum transmit power threshold with a minimum transmit power threshold that the first network side device can bear;
  • the first network side device configures the subframe n as an uplink subframe when the maximum transmit power threshold is less than the minimum transmit power threshold;
  • the first network side device configures the subframe n as a downlink subframe and uses the maximum transmit power threshold as the maximum downlink transmit power value of the subframe ⁇ . .
  • the minimum transmission power threshold that the first network side device can bear can be directly or indirectly agreed by the protocol, or the device is configured by the factory, or according to the actual situation (device implementation capability and/or cost, cell coverage, system throughput) Quantity, etc.) configuration.
  • the network side device in the embodiment of the present invention may be a base station (such as a macro base station, a home base station, etc.), an RN (relay) device, or other network side devices.
  • the network side device for performing interference coordination is also provided in the embodiment of the present invention. Since the principle of solving the problem is similar to the method for performing interference coordination, the implementation of the device may refer to the implementation of the method. The repetitions are not repeated here.
  • the device for performing interference coordination in the embodiment of the present invention includes: a threshold value determining module 10 and a configuration module 20.
  • the threshold value determining module 10 is configured to determine a maximum transmit power threshold value in which the interference control of the second network side device can be within a range that the second network side device can bear.
  • the configuration module 20 is configured to configure, according to the maximum transmit power threshold determined by the threshold determining module 10, a subframe n that needs to be configured as a downlink, to reduce interference of the subframe n to the neighboring cell after the configuration; wherein, n is non Negative integer.
  • the threshold determining module 10 may first measure the deployment of the neighboring base station, such as determining the number of effective interfering base stations and the respective RSRP values, and/or The base station configuration information is exchanged with the neighboring base station, where the configuration information includes but is not limited to at least one of the following information: transmit power, resource configuration information.
  • the threshold value determining module 10 determines the maximum transmit power threshold according to the device information of the second network side device or according to the device information of the first network side device and the device information of the second network side device.
  • the device information of the first network side device includes but is not limited to at least one of the following information: spectrum allocation information and resource scheduling information.
  • the device information of the second network side device includes but is not limited to at least one of the following information:
  • the path loss value between the first network side device and the second network side device The path loss value between the first network side device and the second network side device, the reference signal received power value of the second network side device, the spectrum allocation information, the resource scheduling information, and the interference tolerance value.
  • the threshold determining module 10 determines the maximum transmit power threshold. The following are listed in the following manner: 1.
  • the threshold determining module 10 is configured according to device information of each second network side device, or according to Selecting, by the device information of the first network side device and the device information of each of the second network side devices, a second network side device as a reference device from the second network side device that is around the first network side device; The device information of the device or the device according to the first network side device and the device information of the reference device determine the maximum transmit power threshold.
  • the threshold value determining module 10 determines the nearest second network side device as the reference device; or the first network side device determines the second network side device with the smallest path loss value as the reference device.
  • the threshold determination module 10 can determine the maximum transmit power threshold according to Equation 1 or Equation 2:
  • the threshold value determining module 10 determines the circumference according to the device information of each of the second network side devices in the surrounding area, or according to the device information of the first network side device and the device information of each of the surrounding second network side devices. a maximum transmit power gate p ⁇ value corresponding to each second network side device; selecting from a plurality of determined maximum transmit power gates P ⁇ A maximum transmit power threshold.
  • the threshold value determining module 10 can randomly select one.
  • the first network side device selects a minimum one of the maximum transmit power thresholds.
  • the threshold value determining module 10 may also determine the maximum transmit power threshold according to the formula 1 or the formula 2. For details, refer to the corresponding part of the mode, and details are not described herein again.
  • embodiments of the present invention are not limited to the above two manners, and other manners for determining the maximum transmit power threshold value around the first network side device are also applicable to the embodiments of the present invention.
  • the second network side device that is located around the first network side device may be all the network side devices that are around the first network side device; or may be around the first network side device and interfered by the first network side device. Network side device.
  • the configuration module 20 compares the maximum transmit power threshold with a minimum transmit power threshold that the first network side device can withstand; when the maximum transmit power threshold is less than the minimum transmit power threshold,
  • the frame n is configured as an uplink subframe.
  • the maximum transmit power threshold is not less than the minimum transmit power threshold, the subframe n is configured as a downlink subframe, and the maximum transmit power threshold is used as the maximum downlink of the subframe n. Transmit power value.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions are provided for implementing one or more processes and/or block diagrams in the flowchart The steps of the function specified in the box or in multiple boxes.
  • the first network side device configures the subframe n that needs to be configured as a downlink according to a maximum transmit power threshold value within a range that the second network side device can bear by the interference control of the second network side device, thereby configuring
  • the slot interference caused by different uplink and downlink configurations is reduced; the system stability and performance are further improved.

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

Abstract

Le mode de réalisation de l'invention porte sur le domaine technique des radiocommunications, et en particulier sur un procédé, un système et un équipement pour coordination de brouillage, qui sont utilisés pour réduire le brouillage de créneau temporel dans la situation de variation dynamique de la demande proportionnelle d'activités de liaison montante et de liaison descendante. Le procédé de coordination de brouillage décrit par le mode de réalisation de l'invention comprend les étapes suivantes consistant à : confirmer un seuil de puissance d'émission maximale par un premier équipement de réseau dans lequel un brouillage sur un second équipement de réseau est limité dans une plage supportable du second équipement de réseau ; attribuer une sous-trame n devant être attribuée à titre de liaison descendante par le premier équipement de réseau sur la base du seuil de puissance d'émission maximale confirmé, de manière à ce que le brouillage de la sous-trame n attribuée sur des cellules adjacentes soit réduit, n étant un entier non négatif. Le procédé décrit par le mode de réalisation de l'invention permet de réduire le brouillage de créneau temporel dû à une attribution de liaison montante et une attribution de liaison descendante différentes dans la situation de variation dynamique de la demande proportionnelle d'activités de liaison montante et de liaison descendante, et d'augmenter la stabilité et les performances du système.
PCT/CN2012/073480 2011-04-14 2012-04-01 Procédé, système et équipement pour coordination de brouillage WO2012139472A1 (fr)

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