WO2012040877A9 - Signaux de référence dans un système de communication - Google Patents

Signaux de référence dans un système de communication Download PDF

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Publication number
WO2012040877A9
WO2012040877A9 PCT/CN2010/001531 CN2010001531W WO2012040877A9 WO 2012040877 A9 WO2012040877 A9 WO 2012040877A9 CN 2010001531 W CN2010001531 W CN 2010001531W WO 2012040877 A9 WO2012040877 A9 WO 2012040877A9
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WIPO (PCT)
Prior art keywords
muting
accordance
signalling
pattern
information
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PCT/CN2010/001531
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English (en)
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WO2012040877A1 (fr
Inventor
Xiaoyi Wang
Deshan Miao
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Nokia Siemens Networks Oy
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Priority to PCT/CN2010/001531 priority Critical patent/WO2012040877A1/fr
Publication of WO2012040877A1 publication Critical patent/WO2012040877A1/fr
Publication of WO2012040877A9 publication Critical patent/WO2012040877A9/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
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies

Definitions

  • This disclosure relates to reference signalling, and more particularly, but not exclusively, to signalling of resource patterns.
  • the patterns can be used in communications systems by devices such as base stations and mobile communication devices for communication of information associated with sig ⁇ nailing resources.
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as fixed or mobile communication devices, base stations, servers and/or other communication nodes.
  • a communication system and compatible communicating entities typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved.
  • the standards, specifications a d related protocols can define the manner how communication devices can access the communication system and how various aspects of communication shall be implemented between communicating devices.
  • a communication can be carried on wired or wireless carriers. In a wireless communication system at least a part of the communication between at least two stations occurs over a wireless link .
  • wireless systems include public land mobile networks (PLMN) such as cellular networks, satellite based communication systems and different wireless local networks, for example wireless local area networks (LAN) .
  • PLMN public land mobile networks
  • LAN wireless local area networks
  • a wireless system can be divided into cells, and hence these are often referred to as cellular systems.
  • a cell is provided by a base station. Cells can have different shapes and sizes. A cell can also be divided into sectors. Regardless of the shape and size of the cell providing access for a user, and whether the access is provided via a sector of a cell or a cell, such area can be called radio service area or access area. Neighbouring radio service areas typically overlap, and thus a communication in an area can listen to more than one base station.
  • a user can access the communication system by means of an appropriate communication device.
  • a communication device of a user is often referred to as user equipment (UE) or terminal.
  • UE user equipment
  • a communication device is provided with an appropriate signal receiving and transmitting arrangement for enabling communications with other parties.
  • a communication device is used for enabling receiving and transmission of communications such as speech and data.
  • a communication device provides a transceiver station that can communicate with another communication device such as e.g. a base station of an access network and/or another user equipment.
  • the communication device may access a carrier provided by a station, for example a base station, and transmit and/or receive communications on the carrier.
  • LTE Long-term evolution
  • UMTS Universal Mobile Telecommunications System
  • LTE-Advanced LTE-Advanced
  • releases Various signalling information is sent between a base station and mobile devices. For example, reference signals can be sent from a base station to mobile devices and vice versa.
  • CSI-RS channel state information reference signal
  • PDSCH Physical Downlink Shared Channel
  • RE resource element muting
  • the muting is a mutual action since the neighbour areas (sectors or cells) also have CSI-RS, and the muting for a sector or cell means muting of PDSCH resource elements of the neighbours. That is, when the PDSCH is transmitted, the resource elements to other areas but corresponding to the serving area's CSI-RS should be muted.
  • user equipment in the serving area should know the current muting pattern so that it can avoid neighbour area's CSI-RS.
  • An indication of muting of resources of neighbouring service areas can be located at relevant locations of a CSI-RS pattern. Because of the mutual behaviour some coordination between the different service areas may be desired.
  • the radio conditions and parameters may be different in neighbouring service areas.
  • parameters such as frequency reuse factor and number of ports may vary from a service are to the other, thus complicating the coordinated use of resources for reference signalling in different service areas. It is noted that the above discusses only examples, and the issues are not limited to any particular communication system, standard, specification and so forth, but may occur in any communication system where information associated with signalling resources may need to be communicated to a plurality services areas.
  • Embodiments of the invention aim to address one or several of the above issues.
  • a method of controlling reference signalling comprising: generating a signalling pattern associated with at least one radio service area, the pattern comprising locations for indicating resources for reference signalling in a first radio service area; signalling the pattern; signalling clustering information, the clustering information comprising information of at least one of muting ports and frequency reuse to enable communication devices in the first radio service area to determine a muting configuration based on the signalling pattern and said clustering information; and using resources indicated by one or more of the locations in the muting cluster for reference signalling in the first radio service area and muting resources indicated by other locations in the muting cluster .
  • a method of controlling reference signalling comprising: receiving by a communication device a signalling pattern, the pattern comprising locations for indicating resources for reference sig ⁇ nalling in a first radio service area; receiving by the communication device clustering information, the clustering information comprising information of at least one of muting ports and frequency reuse; determining a muting configuration based on the received signalling pattern and the clustering information; and determining, based on the muting configuration, how muting of resources for reference signalling is arranged in the first radio service area.
  • an apparatus comprising at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to: generate a signalling pattern associated with at least one radio service area, the pattern comprising locations for indicating resources for reference signalling in a first radio service area; cause signalling of the pattern and of clustering information, the clustering information comprising information of at least one of muting ports and frequency reuse to enable communication devices in the first radio service area to determine a muting configuration based on the pattern and said clustering information; and use resources indicated by one or more of the locations in the muting cluster for reference signalling in the first radio service area and to mute resources indicated by other locations in the muting cluster.
  • an appara- tus comprising at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to: process a received signalling pattern, the pattern comprising locations for indicating re- sources for reference signalling in a first radio service area; process received clustering information, the clustering information comprising information of at least one of muting ports and frequency reuse; determine a muting configuration based on the received signalling pattern and the clustering information; and determine, based on the muting configuration, how muting of resources for reference signalling is arranged in the first radio service area.
  • information of muting ports comprises the number of muting ports and/or the information of frequency reuse comprise a frequency reuse number.
  • the reference signalling may comprise signalling of a channel state information reference signal.
  • the clustered locations of the pattern can be cyclically reused for reference signalling. It can be determined, based on a frequency reuse parameter, that at least one location does not belong to a full cluster, and in response thereto an indicator of an odd group can be sent or received. Resource locations of a port number can be mapped to resource locations of another port number.
  • a communication device and/or base station comprising a control apparatus configured to provide at least one of the embodiments can also be provided.
  • the communication device may comprise a user equipment, for example a mobile station.
  • a computer program comprising program code means adapted to perform the herein described methods may also be provided.
  • apparatus and/or computer program product that can be embodied on a computer readable medium for providing at least one of the above methods is provided .
  • Figure 1 shows an example of a communication system wherein below described examples of the invention may be implemented
  • Figure 2 shows an example of a communication device
  • Figure 3 shows an example of controller apparatus for a base station
  • Figure 4 is flowchart illustrating an embodiment
  • Figures 5A to 5C and 6A to 6C show examples for CSI-RS patterns ;
  • Figure 7 shows two examples for grouping of CSI-RS indexes
  • Figure 8 shows two examples for grouping of CSI-RS indexes in accordance with a further embodiment
  • Figure 9 shows an example of scenario where neighbours have different numbers of ports.
  • FIGS 10 and 11 show embodiments where joint signalling of clustering information is provided.
  • a mobile communication device 21 is typically provided wireless access via at least one base station or similar wireless transmitter and/or receiver node of an access system.
  • three neighbouring access systems or radio service ar- eas 36, 37 and 38 are shown being provided by base stations 20.
  • An access system may be provided by a cell of a cellular system or another system enabling a communication device to access a communication system.
  • a base station site 20 can provide one or more cells.
  • a base station can also provide a plurality of sectors, for example three radio sectors, each sector providing a cell or a subarea of a cell. All sectors within a cell can be served by the same base station.
  • a radio link within a sector can be identified by a single logical identification belonging to that sector.
  • a base station can provide one or more radio service areas.
  • Each mobile communication device 21 and base station 20 may have one or more radio channels open at the same time and may send signals to and/or receive signals from more than one source .
  • a base station 20 is typically controlled by at least one ap-litiste controller so as to enable operation thereof and management of mobile communication devices 21 in communication with the base station.
  • the control apparatus can be interconnected with other control entities.
  • a controller apparatus is shown to be provided by block 30.
  • a base station control apparatus is typically provided with memory capacity 31 and at least one data processor 32.
  • the control apparatus and functions may be distributed between a plurality of control units.
  • the cell borders or edges are schematically shown for illustration purposes only by the dashed lines in Figure 1. It shall be understood that the sizes and shapes of the cells or other radio service areas may vary considerably from the similarly sized omni-directional shapes of Figure 1. As shown, the radio service areas can overlap. Thus signals transmitted in an area can interfere with communications in another area
  • the communication devices 21 can access the communication system based on various access techniques, such as code division multiple access (CDMA) , or wideband CDMA ( CDMA) .
  • CDMA code division multiple access
  • CDMA wideband CDMA
  • Other examples include time division multiple access (TDMA) , frequency division multiple access (FDMA) and various schemes thereof such as the interleaved frequency division multiple access (IFDMA), single carrier frequency division multiple access (SC-FDMA) and orthogonal frequency division multiple access (OFDMA) , space division multiple access (SDMA) and so on .
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • IFDMA interleaved frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SDMA space division multiple access
  • LTE long-term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • LTE-Advanced Non-limiting examples of appropriate access nodes are a base station of a cellular system, for example what is known as NodeB (NB) in the vocabulary of the 3GPP specifications.
  • NB NodeB
  • the LTE employs a mobile architecture known as the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) .
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Base stations of such systems are known as evolved Node Bs (eNBs) and may provide E-UTRAN features such as user plane Radio Link Control/Medium Access Control/Physical layer protocol (RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the user devices.
  • E-UTRAN features such as user plane Radio Link Control/Medium Access Control/Physical layer protocol (RLC/MAC/PHY) and control plane Radio Resource Control (RRC) protocol terminations towards the user devices.
  • RLC/MAC/PHY Radio Link Control/Medium Access Control/Physical layer protocol
  • RRC Radio Resource Control
  • Other examples of radio access system include those provided by base stations of systems that are based on technologies such as wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access) .
  • WLAN wireless local area network
  • WiMax Worldwide Interoperability for Microwave Access
  • the base stations of the access systems are connected to a wider communications network 35.
  • a controller may be provided for coordinating the operation of the access systems.
  • a gateway function may also be provided to connect to -another network via the network 35.
  • the other network may be any appropriate network.
  • a wider communication system may thus be provided by one or more interconnect networks and the elements thereof, and one or more gateways may be provided for interconnecting various networks .
  • FIG. 2 shows a schematic, partially sectioned view of a communication device 21 that a user can use for communication.
  • a communication device is often referred to as user equipment (UE) or terminal.
  • An appropriate mobile communication device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples include a mobile station (MS) such as a mobile phone or what is known as a 'smart phone', a portable computer provided with a wireless interface card or other wireless interface facility, personal data assistant (PDA) provided with wireless communication capabilities, or any combinations of these or the like.
  • MS mobile station
  • PDA personal data assistant
  • a mobile communication device may provide, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and so on. Users may thus be offered and provided numerous services via their communication devices.
  • Non-limiting examples of these services include two-way or multi-way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet. User may also be provided broadcast or multicast data.
  • Non-limiting examples of the content include downloads, television and radio programs, videos, advertisements, various alerts and other information.
  • the mobile device 21 may receive signals over an air interface 28 via appropriate ap- paratus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 27.
  • the transceiver may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • a wireless communication device can be provided with a Multiple Input / Multiple Output (MIMO) antenna system.
  • MIMO Multiple Input / Multiple Output
  • MIMO ar- rangements as such are known.
  • MIMO systems use multiple an ⁇ tennas at the transmitter and receiver along with advanced digital signal processing to improve link quality and capac ⁇ ity.
  • multiple antennas can be provided, for example at base stations and mobile sta- tions, and the transceiver apparatus 27 of Figure 2 can provide a plurality of antenna ports. More data can be received and/or sent where there are more antennae elements.
  • a station may comprise an array of multiple antennae. Reference signalling and muting patterns can be associated with Tx antenna numbers or port numbers of MIMO arrangements.
  • a mobile device is also typically provided with at least one data processing entity 23, at least one memory 24 and other possible components 29 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is de- noted by reference 26. Possible control functions in view of configuring the mobile communication device for reception and processing of information in association with transmission patterns and for muting signals by means of the data processing facility in accordance with certain embodiments of the present invention will be described later in this description .
  • the user may control the operation of the mobile device by means of a suitable user interface such as key pad 22, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 25, a speaker and a microphone are also typically provided.
  • a mobile communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external ac ⁇ cessories, for example hands-free equipment, thereto.
  • Figure 3 shows an example of a control apparatus 30 for a communication system, for example to be coupled to and/or for controlling a station of an access system.
  • the control apparatus 30 can be arranged to provide control on communications by mobile communication devices that are in the service area of the system.
  • the control apparatus 30 can be configured to provide control functions in association with generation and communication of transmission patterns and other related information and for muting signals by means of the data processing facility in accordance with certain embodiments described below.
  • the control apparatus 30 comprises at least one memory 31, at least one data processing unit 32, 33 and an input/output interface 34. Via the interface the control apparatus can be coupled to a receiver and a transmitter of the base station.
  • the control apparatus 30 can be configured to execute an appropriate software code to provide the control functions.
  • the required data processing apparatus and functions of a base station apparatus, a communication device and any other appropriate station may be provided by means of one or more data processors.
  • the described functions at each end may be provided by separate processors or by an integrated processor.
  • the data processors may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, micro- processors, digital signal processors (DSPs) , application specific integrated circuits (ASIC) , gate level circuits and processors based on multi core processor architecture, as non limiting examples.
  • the data processing may be distributed across several data processing modules.
  • a data processor may be provided by means of, for example, at least one chip. Appropriate memory capacity can also be provided in the relevant devices.
  • the memory or memories may be of any type suit ⁇ able to the local technical environment and may be imple ⁇ mented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • FIG. 4 illustrates an example where information to enable reference signalling is communicated.
  • a signalling pattern that is associated with at least one radio service area is generated at 50.
  • the pattern comprises locations for indicating resources for reference signalling in the at least one radio service area, for example at area 36 of Figure 1. At least two of the locations can be associated to form a muting cluster at 52.
  • the pattern in signalled to communication devices in the at least one area at 54.
  • Clustering information is signalled at 56, either at the same time with step 54 or at a different time.
  • the clustering information comprises information of at least one of muting ports and frequency reuse to enable the communication devices in the at least one radio service area to determine a muting configuration based on the signalling pattern and said clustering information.
  • a communication device within the at least one radio service area receives the signalling pattern at 58, and the clustering information at 60.
  • the communication device can then determine at 62 a muting configuration based on the received signalling pattern and the clustering information. Resources indicated by one or more of the locations in the muting cluster are used for a first radio service area at 64 and resources indicated by other locations in the muting cluster for at least one second radio service area are muted.
  • channel state information reference signal (CSI-RS) is provided to save reference signal (RS) overhead and to implement downlink channel estimation.
  • CSI-RS channel state information reference signal
  • Use of a CSI-RS pattern has been proposed for communication of information associated with the reference signalling. Examples of such patterns for 2, 4 and 8 CSI-RS ports are shown in Figures 5 and 6.
  • the vertical axis of the pattern illustrates the frequency domain for orthogonal frequency division multiplexed (OFDM) subcarriers and the horizontal axis illustrates the time domain for ODFM symbols.
  • Tx number the number of CSI-RS ports is referred to by the term Tx number.
  • PDSCH resource element (RE) muting can be deployed to avoid interference to the channel state informa- tion reference signals (CSI-RS) by neighbouring cells and/or sectors.
  • CSI-RS channel state informa- tion reference signals
  • PDSCH RE muting can be applied at CSI-RS pattern in locations that are intended for neighbouring cells or sectors.
  • Various parameters may need to be considered when muting is applied. For example, information about a muting frequency reuse (FR) factor, number of CSI-RS ports, and differences in the ports between neighbouring cells and/or sectors may need to be provided and/or considered by relevant devices.
  • eNB indicates its own CSI-RS locations for the serving cell/sector.
  • a neighbor sector or cell can indicate its CSI-RS to the user equipment it is serving.
  • the user equipment in a cell or sector may only receive the CSI-RS location of its own cell/sector, and it is not required that a user equipment knows the neighbor cell's or sector's CSI-RS location.
  • muting TX number and a frequency reuse (FR) number can be signalled to a user equipment, or all user equipment in relevant radio service areas. It is noted that a muting TX number can be different from the actual TX number of the serving cell/sector.
  • the signalling can be provided, for example, by signalling such as radio resource control (RRC) signalling.
  • RRC radio resource control
  • information about muting FR number and/or muting Tx number can be signaled by means of cell-specific RRC signaling.
  • Such signaling may be carried by a channel such as a physical broadcast channel (PBCH) .
  • PBCH physical broadcast channel
  • the information can be separately or jointly encoded. This information can then be used by the relevant user equipments to determine a muting configuration.
  • a nested indexing scheme can be provided where a user equipment can map the serving cell's/sector's indexes from a current Tx number to a muting Tx number.
  • the following presents certain examples for ways to group indexes and patterns. This can be provided to enable operation with different frequency reuse factors and/or antenna configurations.
  • an independent muting transmitter (Tx) ports number configuration is provided. This can be provided to address, for example, a situation where a neighbouring sector has a different Tx number than the serving sector.
  • indexes in a pattern are cyclically reused.
  • At least two indexes of a pattern can be grouped to provide an intra subframe index.
  • the intra subframe index can then be used by the receiving device, for example a user equipment listening to the CSI-RS, to select the muting cluster that is being used. Based on this the receiving device can determine which locations in the pattern it shall use for reference signalling.
  • the CSI-RS location of the serving access system can be indicated ex ⁇ plicitly for the at least one user equipment.
  • the user equipment can determine based on the pattern and clusters which locations are to be muted. The user equipment can assume that at least some resource elements are muted for the PDSCH by the base station.
  • the muted resource elements can be decided based on information of the muting cluster, and more particularly based on information of the muting cluster the own sector's CSI-RS is located in. Muting of some resource elements means that no data is sent on those re ⁇ source elements. The user equipment, however, may need to know about the muted resource elements locations, for example for the purposes of rate matching.
  • FIG. 5A - 5C illustrate the channel state information reference signals (CSI-RS) and their indexing patterns as an example in- accordance with an embodiment shown in Figures 5A - 5C.
  • Figures 6A - 6C illustrate another possible CSI-RS location indexing scheme. It is noted, however, that these are only examples that are given to illustrate the principle, and that any other appropriate manner for the indexing can also be used. In these Figures different Tx numbers are using different indexing.
  • CSI-RS resource element (RE) locations on a Physical Downlink Shared Channel (PDSCH) are indicated by index num- bers 0 to 19 in a two port pattern
  • index num- bers 0 to 19 in Figures 5B and 6B ten locations have indexes 0 to 9 in a four port pattern
  • index numbers 0 to 4 in Figures 5C and 6C
  • a group of indexes can be determined based on information about the frequency reuse (FR) number.
  • All CSI-RS indexes can be categorized into different muting clusters. By grouping the indexes relations can be provided between a serving cell's / sector's CSI-RS index and a muting pattern. For example, a user equipment can mute all other CSI-RS locations in the patterns in the group where the serving cell's / sector's CSI-RS index is in. To illustrate, if CSI-RS indexes 1, 2, and 3 form a group, and if the serving cell's / sector's CSI-RS index is 1, then the user equipment can determine that indexes 2 and 3 of that group are muted.
  • a user equipment can be made aware of the Tx number, for example by broadcasting the CSI- RS Tx number of the serving cell / sector. The user equip- ment can then determine the number of CSI-RS indexes based on the Tx number.
  • n is an integer
  • Group n is the index set of group n
  • N is the number of CSI-RS indexes associated with the current Tx number
  • FR is a frequency reuse parameter
  • muting pattern is determined as Group n , where x e Group n and x is serving sectors' CSI-RS index.
  • the index can be signalled to the user equipment by an appropriate man- ner.
  • the network entity for example aeNB and user equipment share the same knowledge in that all other resources elements in group n are muted except the CSI-RS resource element of the user equipment
  • CSI-RS indexes are prohibited in network planning stage, for example if the Co P is deployed. This is relatively easy to implement, but may not always fully utilize all possible CSI-RS indexes.
  • Another option is to extend the grouping mechanism to operate in cyclic shifts. An example for this is shown in Figure 8.
  • indexes from the subsequent sets of indexes can belong to an odd group.
  • the additional special group, or odd group can contain: N N
  • An indication for example a bit or another flag can be used to indicate an "odd group" (cyclic tail or head) .
  • an indication is possible to reuse all CSI-RS indexes at any frequency reuse (FR) number.
  • FR frequency reuse
  • a single bit in muting configuration signalling can be provided to indicate that a special group (odd group) is used, see Figure 8.
  • the single bit indicators may be used only for certain sectors inside a special muting group. For example, a muting pattern cycle can be indicated by a single bit to indicate whether muting pattern is [0,1,2] or [3,4,0] for sector 0.
  • a muting pattern can be associated with a particular CSI-RS index.
  • a muting pattern can be associated with FR number and serving sectors' CSI-RS index .
  • PDSCH RE muting aims to avoid interference to neighbour CSI- RS patterns.
  • the Tx number of neighbour radio service area can be taken into account.
  • neighbouring cells or sectors can have different Tx numbers.
  • Figure 9 illustrates PDSCH muting for CSI- RS in a subframe where different sector have a different Tx number.
  • sector 1 is 2Tx and has two possible resource elements location for the CSI-RS
  • sector 2 is 4Tx and has four possible resource elements location for the CSI-RS
  • sector 3 is 8Tx and has eight possible resource elements location for the CSI-RS.
  • the other resource elements in time domain locations 9 and 10 are muted in the respective patterns .
  • a scenario where neighbour cells or sectors have a different Tx number is addressed by appropriate conversions between the different the Tx numbers. For example, it is possible to convert from 2Tx to 4Tx.
  • a serving sector's CSI-RS index can be converted to a corresponding port in another TX number.
  • the muting TX number is different from serving sector's CSI-RS
  • the CSI-RS index can be converted to a corresponding muting Tx number, and the muting can then take place based on a pre-defined index group in the muting Tx number.
  • CSI-RS index 15 in 2Tx corresponds to CSI-RS index 5 in 4Tx case.
  • the muting pattern can be based on a maximum Tx number.
  • an access system for example an eNB, informs all user equipments about a muting Tx number (this can be same or different from the serving sector's CSI-RS Tx number) and muting FR number, for example by means of RRC signalling.
  • a user equipment receiving the information can then map serving sector' s CSI-RS index from the current Tx number to a muting Tx number based on nested indexing scheme.
  • Nl is the CSI-RS location number according to the current Tx number
  • N2 is the CSI-RS location number according the muting Tx number.
  • Muting grouping can then be done using N2 and FR numbers as input.
  • the muting pattern is then decided by x N2 and N2.
  • CSI-RS index mapping is per- formed in accordance with a rule between different Tx port numbers. Based on a nested structure of CSI-RS location of 8 ports / 4 ports / 2 ports, this can be used to implicitly notify a user equipment in a cooperative set which CSI-RS location or locations in the pattern should be muted.
  • signalling for muting can include the following information and bits. (This illustration assumes that the serving sector's CSI-RS information is already signalled to the user equipment) : Pattern signalling Estimated Bits
  • Odd Group indicator 1 bit (Optional)
  • the FR and muting Tx parameter a jointly encoded.
  • a jointly encoded information is a parameter called "The mut- ing cluster size".
  • the muting cluster size parameter can be an integer of 2Tx CSI-RS locations.
  • the basic muting size corresponds to muting Tx number (1 for 2Tx, 2 for 4Tx, 4 for 8Tx) .
  • the eNB can broadcast only this muting cluster size as a cell-specific parameter.
  • muting cluster size e.g. [ No muting, 3, 6, 12 ] .
  • Another possible signaling method is to jointly encode the FR number, Muting Tx number and the odd group indicator.
  • 3 bits can be reserved for the muting cluster size: [No muting, 3, 3-, 6, 6-, 12, 12-, 20] . An example of this is illustrated by Figure 11.
  • a serving sector is 4 Tx, then there are two possible muting patterns.
  • neighbouring cell maximum Tx number equals 4
  • the maximum pattern shall be configured with muting 4 Tx number. If it is supposed that the serving sector CSI-RS is located among positions [0-4] in figure 5B, then muting pattern would be [0-4].
  • neighbouring cell maximum Tx number equals 8
  • the maximum pattern shall be configured with muting 8 Tx number. If it is supposed that the serving sector CSI-RS is located among positions [0-4] or [5-9] in figure 5B, then muting pattern would be [0-9] .
  • the serving sector is 2 Tx
  • three muting patterns are possible.
  • the maximum pattern can be configured with muting 2 Tx number. If it is supposed that the serving sector CSI-RS is located among position [0-4] in figure 5A, then the muting pattern would be [0-4].
  • the maximum pattern can be configured with muting 4 Tx number. If the serving sector CSI-RS is located among positions [0-4] or [10-14] in figure 5A, then muting pattern would correspond to [0-4,10-14].
  • neighbouring cell maximum Tx number equals 8 the maximum pattern can be configured with muting 8 Tx number. If the serving sector CSI-RS is located among positions [0-4] or [5-9] or [10-14] or [15-19] in figure 5A, then muting pattern would be [0-19] .
  • the FR number can be set as a multiple of 5, such as 5 or 10.
  • FR number can also be set as a multiple as 5, such as 5, 10, 15 or 20.
  • each cell CSI-RS index can be configured differently. All possible CSI-RS REs can be grouped to muting clusters according to pre-defined rules. The muting cluster which includes the cell's / sector's own CSI-RS then provides the final muting pattern.
  • muting FR 3 and the total CSI RS pattern number is a multiple of 5.
  • a solution is to limit usage of the CSI pattern indexes which are not multiples of 3. For example, for 8 Tx, [0,1,2] patterns in figure 5C can be used, leaving out patterns 3 and 4.
  • muting pattern set can be defined as:
  • a pattern can correspond to [0,1,2,] [3,4,5] [6,7,8] [9,10,11], [12,13,14],
  • Muting pattern mapping rule can be the same as in the above example. That is, determine first the maximum TX number, and then choose corresponding muting pattern from available pattern sets in accordance with the serving cell CSI RS pattern index .
  • serving sector is 2Tx, and it's CSI-RS index is 15, and the muting TX number is 4.
  • additional information can be used to indicate an overlap set.
  • two pattern sets can be defined, [0 1 2], [3 4 0].
  • index 0 can be found from two pattern sets.
  • One bit signalling can be included e.g. in a broadcasting channel to indicate which muting group this sector belongs to.
  • 4 Tx pat- tern sets [0 1 2 ] [5 6 7] [3 4 8] [9 0 1] can be defined.
  • One bit signalling can be used to indicate use of indexes 0,1.
  • one bit information can be utilized to indicate index 0.
  • An appropriately adapted computer program code product or products may be used for implementing the embodiments, when loaded or otherwise provided on an appropriate data processing apparatus, for example for causing determinations of ap-litiste configurations and communications of information between the various nodes.
  • the program code product for providing the operation may be stored on, provided and embodied by means of an appropriate carrier medium.
  • An appropriate computer program can be embodied on a computer readable re- cord medium. A possibility is to download the program code product via a data network.
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Embodiments of the inventions may thus be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process. Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate .
  • all of the CSI-RS indexes may be reused. Flexibly configurable frequency reuse number can be provided. In principle any number of muting frequency reuses can be employed. Different Tx configurations can be used in a set. Muting configuration does not cause unnecessarily high overhead.

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

Abstract

L'invention porte sur des procédés et un appareil servant à commander une signalisation de référence. Un motif de signalisation qui est associé à au moins une zone de desserte radio est généré, le motif comprenant des emplacements servant à indiquer des ressources de signalisation de référence dans une première zone de desserte radio. Le motif et des informations de regroupement sont signalés dans la zone de desserte radio. Les informations de regroupement comprennent des informations de ports de silence et/ou de réutilisation de fréquence pour permettre à des dispositifs de communication dans la zone de desserte radio de déterminer une configuration de silence. Des ressources indiquées par un ou plusieurs des emplacements dans le groupe de silence sont utilisées pour une signalisation de référence dans une première zone de desserte radio tandis que des ressources indiquées par d'autres emplacements dans le groupe de silence sont réduites au silence.
PCT/CN2010/001531 2010-09-30 2010-09-30 Signaux de référence dans un système de communication WO2012040877A1 (fr)

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