WO2012083692A1 - Procédé destiné à éviter les interférences d'un système lte et station de base - Google Patents

Procédé destiné à éviter les interférences d'un système lte et station de base Download PDF

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Publication number
WO2012083692A1
WO2012083692A1 PCT/CN2011/077588 CN2011077588W WO2012083692A1 WO 2012083692 A1 WO2012083692 A1 WO 2012083692A1 CN 2011077588 W CN2011077588 W CN 2011077588W WO 2012083692 A1 WO2012083692 A1 WO 2012083692A1
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Prior art keywords
base station
frequency band
overlapping frequency
lte system
overlapping
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PCT/CN2011/077588
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English (en)
Chinese (zh)
Inventor
姜冰心
顾军
刘康康
董文斌
张宇
录显明
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中兴通讯股份有限公司
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Publication of WO2012083692A1 publication Critical patent/WO2012083692A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • the present invention relates to a communication backbone or, in particular, to a interference avoidance method and a base station of a Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the existing Inter Cell Interference Coordination (ICIC) can only perform the interference coordination in the same frequency networking in the LTE system.
  • FDD Frequency Division Duplex
  • the interference between the uplink and downlink physical channels is divided into mutual interference of the uplink frequency band and the downlink frequency band.
  • Figure 1 and Figure 3 belong to the uplink mutual interference.
  • Figures 2 and 4 belong to the downlink mutual interference.
  • the positional interference according to the mutual interference frequency band can be divided into edge type overlap and plug-in overlap, and FIG. 1 and FIG. 2 belong to edge type overlap, and FIG. 3 and FIG. 4 belong to plug-in overlap.
  • Uplink edge overlap The different system ⁇ frequency or high frequency end overlaps with the uplink frequency band of the LTE system. Generally, the bandwidth of the different system is 1 to 5 MHz, which overlaps with the frequency domain of the LTE uplink physical uplink control channel (PUCCH). The interference to the PUCCH is severe, which will affect the measurement and the received/not received response (Acknowledge/Non). -acknowledge, abbreviated as ACK/NACK).
  • Downstream edge overlap Different systems overlap the downlink band of the LTE system from the low frequency or high frequency end. Generally, the bandwidth of the different system is 1 to 5 MHz, and the structure of each physical channel is downlink.
  • the physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) and the Physical Downlink Shared Channel (PDSCH) 4 especially serious, this It is bound to affect the reliability of control information and data transmission, resulting in a large number of Hybrid Automatic Repetition Requests (HARQ), and even dropped calls, handover failures, and so on.
  • Up-stream plug-in overlap Different system bandwidths appear in the middle of the upstream band, and different system bands can act as overlapping bands. The data transmitted by PUSCH on the overlapping frequency band is severely affected by a large number of HARQs.
  • Downstream plug-in overlap Different system bandwidths appear in the middle of the downstream band, and different system bands can be used as overlapping bands. The control information and data transmitted by the PDCCH and the PDSCH on the overlapping frequency bands are also severely disturbed.
  • a primary object of the present invention is to provide a WAN system for avoiding at least the degree of interference between LTE and different systems in the related art, and the width of the overlapping frequency band and the position of the overlapping frequency band, which may be serious. The embarrassing problem of the network.
  • a method for the interference avoidance of an LTE system including: a base station of an LTE system learns that an overlapping frequency band exists between a frequency band of an LTE system and other mobile communication systems; and signaling and/or data transmitted by the base station Allocate bands outside the overlapping bands.
  • the base station of the LTE system determines that the frequency band of the LTE system overlaps with other mobile communication systems, and the base station determines that the LTE system and the other mobile communication systems have overlapping frequency bands in the uplink direction or the downlink direction, and determines that the overlapping frequency bands are edge-overlapping;
  • the base station allocates the frequency band outside the overlapping frequency band for the signaling and/or data transmitted by the base station, including: the base station shrinks the uplink or downlink frequency band in the LTE system to the next protocol frequency band of the overlapping frequency band, and transmits signaling for the base station and/or Or data is assigned to the next protocol band.
  • the base station of the LTE system determines that the frequency band of the LTE system overlaps with other mobile communication systems
  • the base station determines that the overlapping frequency band is a plug-in overlap
  • the base station allocates a frequency band other than the overlapping frequency band for the signaling and/or data transmitted by the base station.
  • the method includes: the base station control scheduler allocates physical resource blocks other than the overlapping frequency band for signaling and/or data.
  • the base station control scheduler allocates physical resource blocks other than the overlapping frequency band for signaling and/or data, including: when scheduling data of the dedicated control channel or the dedicated traffic channel of the user, the base station determines that the control channel unit that the scheduler can allocate is not Within the overlapping frequency band; the base station controls the scheduler to allocate control channel elements and physical resource blocks outside the overlapping frequency bands for signaling and/or data.
  • the control channel unit comprises at least one of: scheduling control information in the uplink direction and scheduling control information in the downlink direction.
  • the base station of the LTE system determines that the frequency band of the LTE system overlaps with other mobile communication systems, and includes: the base station determines that the LTE system and the other mobile communication systems have overlapping frequency bands in the downlink direction, and determines that the overlapping frequency band is a plug-in overlap;
  • the transmitted signaling and/or data distribution bands outside the overlapping frequency bands include: the base station controls the downlink scheduler to allocate control channel elements and physical resource blocks other than the overlapping frequency bands for signaling and/or data.
  • the base station controls the downlink scheduler to allocate control channel units and physical resource blocks other than the overlapping frequency band for signaling and/or data, and the base station determines that the common search space of the physical downlink control channel PDCCH under the current LTE system bandwidth is in the overlapping frequency band.
  • the base station controls the downlink scheduler to allocate control channel units in the common search space; and the base station controls the downlink scheduler to allocate physical resource blocks other than the overlapping frequency bands.
  • the base station controls the downlink scheduler to allocate control channel units and physical resource blocks other than the overlapping frequency bands for signaling and/or data, including: the base station determines that the common search space of the PDCCH under the current LTE system bandwidth is within the overlapping frequency band; When the subframe has common control signaling and needs to be scheduled, the base station controls the downlink scheduler to allocate control channel units according to the aggregation level of 8 and the lowest code rate in the common search space; the base station controls the downlink scheduler to allocate physical resource blocks other than the overlapping frequency bands.
  • a base station where the base station is located in an LTE system, and includes: an allocation module, configured to transmit signaling for a base station when a frequency band of an LTE system overlaps with another mobile communication system / or data is allocated to bands outside the overlapping bands.
  • the allocation module is configured to shrink the uplink or downlink frequency band in the LTE system to the overlapping frequency band when the LTE system and the other mobile communication system have overlapping frequency bands in the uplink direction or the downlink direction, and the overlapping frequency bands are edge-overlapping.
  • a protocol band and the next protocol band is allocated for signaling and/or data transmitted by the base station.
  • the allocation module is configured to control the uplink scheduler to allocate physical resource blocks other than the overlapping frequency bands for signaling and/or data when the LTE system has overlapping frequency bands with other mobile communication systems, and the overlapping frequency bands are plug-in overlap.
  • the allocation module is configured to control the uplink scheduler to allocate physical resource blocks other than the overlapping frequency bands for signaling and/or data when the LTE system has overlapping frequency bands with other mobile communication systems, and the overlapping frequency bands are plug-in overlap.
  • the allocation module is configured to control the uplink scheduler to allocate physical resource blocks other than the overlapping frequency bands for signaling and/or data when the LTE system has overlapping frequency bands with other mobile communication systems, and the overlapping frequency bands are plug-in overlap.
  • the present invention by using a frequency band other than the overlapping frequency band, the used frequency band among the scattered idle frequency resources can be avoided, and the large bandwidth supported by the LTE system can be integrated, thereby improving spectrum utilization efficiency and avoiding spectrum waste. At the same time, it also avoids the impact on existing networks
  • FIG. 1 is a schematic diagram of an uplink edge type overlay according to the related art
  • FIG. 2 is a schematic diagram of a downlink edge type overlay according to the related art
  • FIG. 3 is a schematic diagram of an uplink plug-in overlay according to the related art
  • FIG. 5 is a flowchart of an implementation scenario of an LTE system according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of an implementation scenario of an embodiment of the present invention
  • FIG. 8 is a flowchart of a downlink avoidance method according to Embodiment 3 of the present invention
  • FIG. 9 is a structural block diagram of a base station according to an embodiment of the present invention
  • BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • Embodiment 1 An embodiment of the present invention provides a method for avoiding interference in an LTE system.
  • FIG. 5 is a flowchart of a method for the interference avoidance of an LTE system according to an embodiment of the present invention.
  • the method includes: Step S502: A base station of an LTE system learns that an overlapping frequency band exists between a frequency band of an LTE system and another mobile communication system.
  • the base station allocates frequency bands outside the overlapping frequency bands for the signaling and/or data transmitted by the base station, thereby avoiding mutual interference between the LTE system and other systems.
  • the base station of the LTE system can learn the position of the overlapping frequency band at this time by using the overlapping frequency band configured by the background server in the operation and maintenance system.
  • the step S502 may include: determining that the LTE system and the other mobile communication systems have overlapping frequency bands in the uplink direction or the downlink direction, and determining that the overlapping frequency bands are edge-based overlapping; the step S400 may include: The base station shrinks the uplink or downlink frequency band of the LTE system to the next protocol frequency band of the overlapping frequency band, and allocates the next protocol frequency band for the signaling and/or data transmitted by the base station.
  • the step S502 may include: determining that the frequency band of the LTE system overlaps with other mobile communication systems includes: and determining that the overlapping frequency band is a plug-in overlap; step S504 may include: transmitting, by the base station
  • the signaling and/or data allocation bands outside the overlapping frequency bands include: The base station control scheduler allocates physical resource blocks other than the overlapping frequency bands for signaling and/or data.
  • the base station control scheduler allocates physical resource blocks other than the overlapping frequency band for signaling and/or data, including: when scheduling data of the dedicated control channel or the dedicated traffic channel of the user, the base station determines that the control channel unit that the scheduler can allocate is not Within the overlapping frequency bands; the base station control scheduler allocates control channel elements and physical resource blocks outside the overlapping frequency bands for signaling and/or data.
  • the control channel unit includes at least one of the following: scheduling control information in the uplink direction and scheduling control information in the downlink direction. It can be seen that whether it is a plug-in overlap in the uplink direction or a plug-in overlap in the downlink direction, the interference avoidance can be performed in the manner of this embodiment.
  • step S502 may include: determining, by the base station, that the LTE system and the other mobile communication systems have overlapping frequency bands in the downlink direction, and determining that the overlapping frequency band is an insertion.
  • Step S504 may include: the base station controls the downlink scheduler to allocate control channel units and physical resource blocks other than the overlapping frequency bands for signaling and/or data.
  • the base station controls the downlink scheduler to allocate control channel units and physical resource blocks other than the overlapping frequency bands for signaling and/or data, which may be implemented by using one of the following modes:
  • the common search space of the physical downlink control channel PDCCH is outside the overlapping frequency band; when the current subframe has common control signaling to be scheduled, the base station controls the downlink scheduler to allocate the control channel unit in the common search space; the base station controls the downlink scheduler allocation A block of physical resources outside the overlapping band.
  • the second base station determines that the common search space of the PDCCH in the current LTE system bandwidth is within the overlapping frequency band.
  • the base station controls the downlink scheduler to be in the common search space according to the aggregation level of 8 and the lowest.
  • the rate allocation control channel unit the base station controls the downlink scheduler to allocate physical resource blocks other than the overlapping frequency bands.
  • Embodiment 2 This embodiment provides a solution for networking in a LTE system based on overlapping with different systems and overlapping in a frequency domain, and different positions from uplink, downlink, and overlapping frequency bands. Give the process of interference avoidance separately.
  • the mutual interference between the LTE system and the different system is reduced, and the network construction cost caused by the site migration caused by mutual interference is eliminated, that is, by controlling the uplink and downlink scheduling, the overlapping frequency band width and position based on the background configuration, real-time upper and lower
  • the line scheduler performs constraints to prevent information from being transmitted on the Physical Resource Block (PRB) in the overlapping frequency band position.
  • PRB Physical Resource Block
  • This embodiment is used for a method of avoiding interference between LTE and LTE-ADVANCED systems and other existing wireless communication systems. In order to improve the frequency utilization efficiency and not affect the structure of the heterogeneous system network as much as possible, this embodiment tries to prevent the LTE system from carrying valid information on overlapping frequency bands.
  • the uplink edge overlap performs appropriate uplink band shrinking, so that the LTE uplink works at the new frequency point and the next protocol bandwidth, and the frequency band collision is directly avoided.
  • the uplink plug-in overlap does not need to perform band shrinkage, and directly controls the uplink scheduler to allocate PRBs outside the overlapping frequency band to avoid frequency resource loss caused by band shrinkage.
  • the downlink edge overlap method is consistent with the uplink edge overlap.
  • the downlink plug-in overlap does not need to perform band contraction, and directly controls the downlink scheduler to allocate control channel elements (CCEs) and PRBs other than the overlapping frequency, thereby avoiding frequency resource loss caused by band shrinkage.
  • CCEs control channel elements
  • the location randomness of the CCE is allocated in the user equipment (User Equipment, UE for short) search space. If the CCE appears in the overlapping frequency band, it is not scheduled. Since the width and position of the overlapping frequency bands are different, the avoidance effect of the method of the present embodiment is also different. For the uplink edge overlap and the downlink edge overlap, the LTE and the different system are completely staggered in the frequency domain after the avoidance, and the mutual frequency in the frequency domain is completely eliminated. For the uplink plug-in overlap and the downlink plug-in overlap, the effect is significant, and the mutual interference on the overlapping frequency bands can be reduced.
  • Embodiment 3 This embodiment is based on the scenario shown in FIG. 6.
  • the network node of another mobile communication system In the coverage of the Evolved Node B (eNB) of the LTE macro base station, the network node of another mobile communication system is in the vicinity of the eNB, the coverage area is mostly the same, and the two system bands overlap.
  • the LTE UE between the two access network system nodes is bound to be severely affected, and the processes shown in Figures 7 and 8 are triggered. The flow shown in this embodiment will be described in detail below with reference to FIGS. 7 and 8.
  • Step S701 Convert the overlapping frequency band into a corresponding PRB number in the current LTE cell system bandwidth.
  • Step S702 determine whether the overlapping frequency band appears in the LTE uplink frequency band, if yes, proceed to step M1 S703, if no, perform step 4 S708 Step S703, determining whether the type of the overlapping frequency band is a plug-in overlap, if yes, proceeding to step S704, otherwise, proceeding to step S706;
  • Step S704 determining whether the Physical Random Access Channel (PRACH) is no longer overlapped in the frequency band, if yes, proceeding to step S705, otherwise, proceeding to step S707; Step S705, determining that the user is currently in control If the CCE resource of the channel is in the overlapping frequency band, if the current CCE resource of the control channel is not in the overlapping frequency band, step S712 is performed, otherwise, step S711 is performed; step S706, the LTE system shrinks the uplink frequency band to the next protocol frequency band.
  • PRACH Physical
  • Step S707 modifying the frequency domain position of the PRACH to the non-overlapping frequency band, and then proceeding to step S705; Step S708, determining whether it is a plug-in overlap? If yes, go to step S709, otherwise, go to step S710; Step S709, use the downlink plug-in overlapping processing method, the specific process is shown in FIG.
  • Step S710 the LTE system shrinks the downlink frequency band into the next protocol frequency band, and the center The frequency point also moves accordingly, and the process ends; Step S711, the current subframe does not schedule the user, and the process ends; Step S712, the uplink scheduler allocates the resource, and the PRBs other than the overlapping frequency band, and the process ends.
  • FIG. 8 specifically illustrates a processing method of the downlink plug-in overlap. As shown in FIG.
  • Step S801 determining whether to schedule common control signaling such as broadcast and paging, and if yes, proceeding to step S802, otherwise, performing Step S802: Step S802, determining whether the number of time domain symbols in the current cell bandwidth is /?, whether the PRB position corresponding to the CCE used in the common search space is not in the overlapping frequency band, and if yes, proceeding to step S803; otherwise, Step S803 is performed; Step S803, the base station allocates a CCE in a common search space; Step S804, the base station allocates a PRB other than the overlapping frequency band; Step S805, the CCE is allocated according to the aggregation level of 8, and the minimum code rate is used, and then, step S804 is performed; Step S806, it is determined whether the CCE position that the UE can allocate in the current subframe is outside the overlapping frequency band, and if yes, step S807 is performed.
  • Step S801 determining whether to schedule common control signaling such as broadcast and paging,
  • step S808 is performed; step S807, CCEs other than the overlapping frequency band are allocated, and then, step S804 is performed; step S808, the current subframe does not schedule the UE, and the process ends.
  • the main body of the foregoing operation may be a base station.
  • the base station may control the uplink scheduler or the downlink scheduler to perform scheduling. The following describes how to make a sneak for different overlapping band types. 1) Determine the location of the overlapping bands. First, it is determined that the overlapping frequency bands appear in the uplink or downlink of the LTE system, and it is determined that the overlapping frequency bands are edge overlapping or plug-in overlapping.
  • the LTE band is shrunk to the next protocol band, and the center frequency is also moved, as is the case for the downlink overlap. Processing ends. If it is a plug-in overlap, in the current LTE cell bandwidth and frequency point, it is determined whether the uplink or downlink insertion overlap, and the area where the LTE overlaps with the different system frequency band is mapped to the PRB frequency domain index of the LTE system, and after mapping The PRB frequency domain index informs the relevant scheduler. If it is an uplink overlap, go to step 2), otherwise go to step 3).
  • Upstream plug-in overlap Check whether the frequency domain location of the PRACH configuration of each cell in the current LTE system is outside the overlapping frequency band. If the PRACH needs to be re-adjusted to the overlapping frequency band in the overlapping frequency band, then the following processing steps are performed: scheduling a dedicated control channel (Dedicated Control Channel, When the data is abbreviated as DCCH or Dedicated Transaction Channel (DTCH), the CCE (including the uplink scheduling control information and the downlink scheduling control information) that the scheduler can allocate for the UE, if it is within the overlapping frequency band, Then the current subframe does not schedule the user, and the processing ends. Otherwise, continue to allocate CCEs and PRBs outside the overlapping bands, and the process ends.
  • DCCH Dedicated Control Channel
  • DTCH Dedicated Transaction Channel
  • the downlink scheduler allocates CCEs in the common search space and then allocates PRBs outside the overlapping frequency bands. If the common search space part of the PDCCH in the current LTE system bandwidth is included in the overlapping frequency band, when the current subframe has a common control signaling such as broadcast, paging, etc., the downlink scheduler has an aggregation level of 8 in the common search space. , allocate CCE with the lowest code rate, and then allocate the overlapping frequency band to the PRB.
  • FIG. 9 is a structural block diagram of a base station according to an embodiment of the present invention. As shown in FIG.
  • the base station includes: an allocating module 92 configured to transmit a signal for a base station when a frequency band of an LTE system overlaps with other mobile communication systems. Order and/or data are allocated to bands outside the overlapping bands. After the base station knows that the frequency band of the LTE system overlaps with other mobile communication systems, the base station generates a corresponding PRB index according to the position of the overlapping frequency band.
  • the allocating module 92 is configured to shrink the uplink direction in the LTE system when the LTE system and the other mobile communication systems have overlapping frequency bands in the uplink direction or the downlink direction, and the overlapping frequency bands are edge-overlapping.
  • the allocating module 92 is configured to control the uplink scheduler as signaling and/or data when the LTE system has overlapping frequency bands with other mobile communication systems, and the overlapping frequency bands are plug-in overlap. Allocate physical resource blocks outside the overlapping bands.
  • the allocating module 92 is configured to determine that the control channel unit that the scheduler can allocate is not within the overlapping frequency band when scheduling data of the dedicated control channel or the dedicated traffic channel of the user; and controlling the scheduler to be signaling and/or data Control channel units and physical resource blocks outside the overlapping frequency bands are allocated.
  • the control channel unit comprises at least one of: scheduling control information in the uplink direction and scheduling control information in the downlink direction.
  • the allocating module 92 is configured to control the downlink scheduler as signaling and when the LTE system and the other mobile communication systems have overlapping frequency bands in the downlink direction, and determine that the overlapping frequency bands are plug-in overlaps.
  • the allocation module 92 may include: a first determining submodule, configured to determine that a common search space of a physical downlink control channel PDCCH under a current LTE system bandwidth is outside an overlapping frequency band; and a first control submodule, configured to be in a current subframe When the common control signaling needs to be scheduled, the control downlink scheduler allocates the control channel unit in the common search space; the first allocation sub-module is configured to control the downlink scheduler to allocate physical resource blocks other than the overlapping frequency band.
  • the allocating module 92 may include: a second determining submodule, configured to determine that a common search space of the PDCCH under the current LTE system bandwidth is within the overlapping frequency band; and a second control submodule configured to have common control in the current subframe
  • the control downlink scheduler allocates a control channel unit according to the aggregation level of 8 and the lowest code rate in the common search space.
  • the second allocation sub-module is configured to control the downlink scheduler to allocate physical resource blocks other than the overlapping frequency band.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Where in the invention ⁇ " God and principle Any modifications, equivalent substitutions, improvements, etc. made therein are intended to be included within the scope of the present invention.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé destiné à éviter les interférences d'un système LTE et une station de base. Le procédé consiste en ce qui suit : une station de base d'un système LTE acquiert une plage de fréquences de chevauchement existant entre une plage de fréquences du système LTE et celle d'un autre système de communication mobile ; et la station de base alloue une bande de fréquences en dehors de la plage de fréquences de chevauchement pour la signalisation et/ou les données à transmettre. La présente invention permet ainsi d'améliorer l'efficacité d'utilisation du spectre et d'éviter également le gaspillage du spectre.
PCT/CN2011/077588 2010-12-24 2011-07-25 Procédé destiné à éviter les interférences d'un système lte et station de base WO2012083692A1 (fr)

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CN201010606033.2A CN102547734B (zh) 2010-12-24 2010-12-24 Lte系统的干扰避让方法及基站
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US9877331B2 (en) 2013-04-19 2018-01-23 Huawei Technologies Co., Ltd. Resource determining method and apparatus

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