WO2017197642A1 - Protocole de partage dynamique de csi-rs - Google Patents

Protocole de partage dynamique de csi-rs Download PDF

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Publication number
WO2017197642A1
WO2017197642A1 PCT/CN2016/082814 CN2016082814W WO2017197642A1 WO 2017197642 A1 WO2017197642 A1 WO 2017197642A1 CN 2016082814 W CN2016082814 W CN 2016082814W WO 2017197642 A1 WO2017197642 A1 WO 2017197642A1
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WO
WIPO (PCT)
Prior art keywords
resource
csi
measurement pattern
reference signal
user
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PCT/CN2016/082814
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English (en)
Inventor
Deshan Miao
Yi Zhang
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Nokia Technologies Oy
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Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to EP16902027.8A priority Critical patent/EP3459304A4/fr
Priority to PCT/CN2016/082814 priority patent/WO2017197642A1/fr
Publication of WO2017197642A1 publication Critical patent/WO2017197642A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0087—Timing of allocation when data requirements change

Definitions

  • This invention relates generally to wireless communications and, more specifically, relates to channel state information measurement for wireless communications.
  • CSI-RS Channel State Information Reference Signal
  • ZP-CSI-RS is used for DL interference measurement.
  • CSI-RS and ZP-CSI-RS are often configured together.
  • periodic CSI-RS is configured by default, and additionally, aperiodic CQI reporting is enabled to improve feedback accuracy.
  • UE specific CSI-RS resources are configured statically by eNB and assigned to a given UE. According to this fixed CSI-RS resource assignment each UE is only indicated with one UE specific CSI-RS resource within one CSI process, and one UE is configured with at most three CSI-RS processes.
  • 5G the number of UEs will increase significantly, and therefore, static CSI-RS resource assignment will not be efficient.
  • an example method comprises dividing communication resources into a plurality of resource pools for transmission of at least one reference signal; determining a user specific measurement pattern for each of a plurality of user equipments; assigning the plurality of user equipments to one of the resource pools; and transmitting an indication of the assigned resource pool and the user specific measurement pattern to each of the plurality of user equipments to configure the plurality of user equipments to measure and report quality information using the communication resource within the assigned resource pool.
  • an example embodiment is provided in an apparatus comprising at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to: divide communication resources into a plurality of resource pools for transmission of at least one reference signal; determine a user specific measurement pattern for each of a plurality of user equipments; assign the plurality of user equipments to one of the resource pools; and transmit an indication of the assigned resource pool and the user specific measurement pattern to each of the plurality of user equipments to configure the plurality of user equipments to measure and report quality information using the communication resource within the assigned resource pool.
  • an example method comprises: receiving, by a user equipment, measurement information comprising an indication of a resource pool corresponding to communication resources and a user specific measurement pattern for measuring at least one reference signal, wherein the communication resources are shared by a plurality of user equipments; measuring quality information based on the at least one reference signal according to the user specific measurement pattern; and transmitting, via the shared communication resources, a measurement report based at least on the measuring.
  • an example embodiment is provided in an apparatus comprising at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to: receive, by a user equipment, measurement information comprising an indication of a resource pool corresponding to communication resources and a user specific measurement pattern for measuring at least one reference signal, wherein the communication resources are shared by a plurality of user equipments; measure quality information based on the at least one reference signal according to the user specific measurement pattern; and transmit, via the shared communication resources, a measurement report based at least on the measuring
  • FIG. 1 is a block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments may be practiced;
  • FIG. 2 illustrates an example common CSI-RS resource pool according exemplary embodiments
  • FIG. 3 illustrates an example traffic pattern of a user equipment according to exemplary embodiments
  • FIG. 4 illustrates an example periodic pattern based measurement configuration according to exemplary embodiments
  • FIG. 5 illustrates an example one time window based measurement configuration according to exemplary embodiments
  • FIGS. 6 and 7 are logic flow diagrams for dynamic CSI-RS sharing scheme, and illustrate the operation of an exemplary method, a result of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and/or interconnected means for performing functions in accordance with exemplary embodiments.
  • the exemplary embodiments herein describe techniques for dynamic CSI-RS sharing scheme. Additional description of these techniques is presented after a system into which the exemplary embodiments may be used is described.
  • FIG. 1 shows a block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments may be practiced.
  • a user equipment (UE) 110 is in wireless communication with a wireless network 100.
  • a UE is a wireless, typically mobile device that can access a wireless network.
  • the UE 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130 interconnected through one or more buses 127.
  • Each of the one or more transceivers 130 includes a receiver, Rx, 132 and a transmitter, Tx, 133.
  • the one or more buses 127 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like.
  • the one or more transceivers 130 are connected to one or more antennas 128.
  • the one or more memories 125 include computer program code 123.
  • the UE 110 includes a Measurement Module 140, comprising one of or both parts 140-1 and/or 140-2, which may be implemented in a number of ways.
  • the Measurement Module 140 may be implemented in hardware as Measurement Module 140-1, such as being implemented as part of the one or more processors 120.
  • the Measurement Module 140-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the Measurement Module 140 may be implemented as Measurement Module 140-2, which is implemented as computer program code 123 and is executed by the one or more processors 120.
  • the one or more memories 125 and the computer program code 123 may be configured to, with the one or more processors 120, cause the user equipment 110 to perform one or more of the operations as described herein.
  • the UE 110 communicates with eNB 170 via a wireless link 111.
  • the eNB (evolved NodeB) 170 is a base station (e.g., for LTE, long term evolution) that provides access by wireless devices such as the UE 110 to the wireless network 100.
  • the eNB 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N/W I/F (s) ) 161, and one or more transceivers 160 interconnected through one or more buses 157.
  • Each of the one or more transceivers 160 includes a receiver, Rx, 162 and a transmitter, Tx, 163.
  • the one or more transceivers 160 are connected to one or more antennas 158.
  • the one or more memories 155 include computer program code 153.
  • the eNB 170 includes a Configuration Module 150, comprising one of or both parts 150-1 and/or 150-2, which may be implemented in a number of ways.
  • the Configuration Module 150 may be implemented in hardware as Configuration Module 150-1, such as being implemented as part of the one or more processors 152.
  • the Configuration Module 150-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the Configuration Module 150 may be implemented as Configuration Module 150-2, which is implemented as computer program code 153 and is executed by the one or more processors 152.
  • the one or more memories 155 and the computer program code 153 are configured to, with the one or more processors 152, cause the eNB 170 to perform one or more of the operations as described herein.
  • the one or more network interfaces 161 communicate over a network such as via the links 176 and 131.
  • Two or more eNBs 170 communicate using, e.g., link 176.
  • the link 176 may be wired or wireless or both and may implement, e.g., an X2 interface.
  • the one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like.
  • the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195, with the other elements of the eNB 170 being physically in a different location from the RRH, and the one or more buses 157 could be implemented in part as fiber optic cable to connect the other elements of the eNB 170 to the RRH 195.
  • RRH remote radio head
  • each cell can correspond to a single carrier and an eNB may use multiple carriers. So ifthere are three 120 degree cells per cartier and two carriers, then the eNB has a total of 6 cells.
  • the wireless network 100 may include a network control element (NCE) 190 that may include MME (Mobility Management Entity) /SGW (Serving Gateway) functionality, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the Internet) .
  • the eNB 170 is coupled via a link 131 to the NCE 190.
  • the link 131 may be implemented as, e.g., an S1 interface.
  • the NCE 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N/W I/F(s) ) 180, interconnected through one or more buses 185.
  • the one or more memories 171 include computer program code 173.
  • the one or more memories 171 and the computer program code 173 are configured to, with the one or more processors 175, cause the NCE 190 to perform one or more operations.
  • the wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network.
  • Network virtualization involves platform virtualization, often combined with resource virtualization.
  • Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors 152 or 175 and memories 155 and 171, and also such virtualized entities create technical effects.
  • the computer readable memories 125, 155, and 171 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the computer readable memories 125, 155, and 171 may be means for performing storage functions.
  • the processors 120, 152, and 175 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • the processors 120, 152, and 175 may be means for performing functions, such as controlling the UE 110, eNB 170, and other functions as described herein.
  • the various embodiments of the user equipment 110 can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • CSI-RS and ZP CSI-RS are crucial to UE CQI measurements.
  • MIMO transmission, SU-MIMO, MU-MIMO, multi-site MIMO require different measurement hypotheses, where one hypothesis requires one unique CSI-RS/ZP-CSI-RS resource pair.
  • antenna structure is more complicated due to the increase in the number of antenna elements and the requirement for frequency band specific implementation.
  • MIMO mode will be more diverse in this context. For example, transceiver unit (TXRU) , antenna port, and antenna elements mapping will have more possible implementation, which will also require more CQI report hypotheses and more CSI-RS resources.
  • TDD time division duplexing
  • different UEs will have different beamforming vectors based on channel reciprocity, and in theory, the network should configure different CSI-RS/ZP-CSI-RS resources for each of these UEs.
  • CSI-RS and ZP-CSI-RS resource requiremen ts are increased by ten times or even more.
  • a UE In LTE smart phone service, a UE will often transmit data with a certain burst pattern. The UE is not always transmitting data during the entire RRC connection period. For this case, periodic and fixed CSI-RS configurations result in inefficient CSI-RS utilization.
  • Massive MTC is an important issue for 5G wireless networks. Massive MTC allows a huge number of UEs within one cell to connect to the network. However, not all the UEs are actively transmitting data. Data traffic may be burst specific for massive MTC, for example, and therefore only a limited CQI measurement duration is needed.
  • the typical technique of directly assigning CSI-RS resources is ineffective since it will eat system offered capacity.
  • techniques are provided for improving CSI-RS utilization efficiency by sharing the same CSI-RS resources between different UEs in a dynamic way and and by providing a corresponding CSI-RS measurement mechanism. These techniques will help improve CSI-RS resource utilization efficiency to meet the more demanding CQI measurement requirements.
  • 3GPP TR 36.897 there is a proposal, in which a UE is configured with a CSI process on which the actual NZP CSI-RS transmission and CSI-IM measurement instances are controlled by eNB and signaled to the UE.
  • Embodiments herein provide a dynamic CSI-RS resource sharing scheme.
  • the following steps which are described in greater detail below, may be formed by, e.g., a base station:
  • ⁇ Setting up CSI-RS and/or ZP-CSI-RS resource pools and inform them to UE.
  • User equipments that are associated with a cell are informed of the resource pools. For the whole cell there may be multiple possible resource pools, and a user equipment in the cell may be notified of only one of the resource pools for CSI measurement.
  • a given user equipment in the cell may be informed of a single resource pool having one or multiple copies of CSI-RS resources, where one CSI-RS resource refers to one resource elements group used to measure CSI of one or multiple antenna ports.
  • One ZP-CSI-RS resource refers to one resource elements group that is used to measure the interference from a neighboring cell, a neighboring beam, or a neighboring transmission point.
  • resource pool is used herein, it should be understood that other terms may be used such as resource groups, clusters, sets, etc.
  • one or multiple resource pools can be indicated to UE.
  • the base station formulates UE specific CSI-RS measurement patterns according to traffic characteristics of each UE, wherein each UE may have one or multiple CSI-RS measurement pattern to match different traffic characteristics.
  • the base station coordinates multiple UEs to share a common CSI-RS/ZP-CSI-RS resource for monitoring and reporting the CSI-RS/ZP-CSI-RS resources.
  • ⁇ Inform UE to monitor/measure indicated CSI-RS/ZP-CSI-RS resource and report CQI according to indicated CSI-RS/NZP-CSI-RS measurement pattern.
  • Indication could UE specific or group UE specific.
  • this indication may comprise a rate matching pattern, which can help UE to do rate matching based on one or multiple resource pools.
  • a rate matching pattern is used for a user equipment to determine which resource elements are reserved by CSI-RS or ZP-CSI-RS. Then the transmitted data packet will not be assigned in these resource elements.
  • the demodulation reliability can be improved.
  • the base station may inform a user equipment to measure CSI-RS in particular time or frequency band of CSI-RS resource. In another embodiment, the base station may inform a user equipment to measure a new CSI-RS resource index within a resource pool that was previously indicated. In another embodiment, the base station may inform a user equipment about CSI-RS resource to beam mapping relationship or which beams are active to update CSI-RS resource measurement configuration. For this beamforming case, it is possible to define more beams than CSI-RS resources, and during one period, only partial beam specific CSI-RS may be measured, or one beam specific CSI-RS can be measured only in partial frequency resource of one CSI-RS resource. Herein one beam specific CSI-RS may comprise of one or multiple beamformed CSI-RS ports.
  • One CSI-RS Resource Pool Configuration The base station sets up CSI-RS and/or ZP-CSI-RS resource pools.
  • One CSI-RS/ZP-CSI-RS resource pool is defined as one set of CSI-RS resource.
  • One CSI-RS resource may comprise one or multiple CSI-RS/ZP-CSI-RS resource units. Each resource unit could be associated with a resource elements group and be indexed. This resource is specified as periodic time-frequency resource. Specially, there could be one whole subframe used for common CSI-RS and ZP-CSI-RS resource.
  • this figure illustrates an example CSI-RS/ZP-CSI-RS resource pool.
  • An example subframe 200 is defined on a time 202 and frequency 204 chart.
  • the subframe 200 includes five subbands (labeled subbandl-suband5) .
  • Multiple CSI-RS/ZP-CSI-RS resource units 210 are shown. These resource units 210 collectively form the CSI-RS resource pool as described above.
  • FIG. 3 illustrates an example traffic pattern for a smart phone in relation to time.
  • the different shaded bars indicate the traffic of different services and applications of the smart phone.
  • the traffic indicated by bar 302 may be for a weather application
  • the traffic indicated by bar 304 may be location services
  • the base station may extracts the UE traffic pattern according to the traffic patterns.
  • the traffic patterns relating to bar 302 and bar 304 are regular and may easily be estimated.
  • one regular CSI-RS measurement pattern may be configured by the base station.
  • the traffic pattern is not regular, or different traffics are mixed together.
  • a one-time window could be set up. This means the UE will measure CSI-RS/ZP-CSI-RS resource within one shot time window. For each triggering/activation, only one time window for CSI-RS measurement is effective. The UE will stop the measurement after it expires unless receiving new activation command.
  • one UE may have multiple CSI-RS measurement patterns.
  • Multiple UE coordination to share common CSI-RS resource Ifmultiple UEs have different CSI-RS measurement pattern due to traffic differences, then the base station may still arrange multiple UEs to share one single CSI-RS resource. In these situations the base station may assign, for example, different CSI-RS measurement patterns to different UEs and coordinate these UEs to use the same one single CSI-RS resource. This significantly improves CSI-RS utilization efficiency.
  • the base station sets up one pattern according to UE DL service characteristic, and the UE is notified to measure CSI-RS/ZP-CSI-RS based on a specific pattern.
  • This specific pattern could be one of pre-configured patterns.
  • the CSI-RS transmission period is independent of the CSI-RS measurement pattern.
  • FIG. 4 illustrates an example CSI-RS measurement configuration for a UE 400.
  • This measurement configuration include an “ON” period 402, where the UE will measure CSI-RS, derive CQI, and report it to the base station.
  • the CSI-RS could be used by a different UE, and no CQI report is needed.
  • this ON-OFF pattern may be aligned with UE DRX pattern. From the CSI-RS type point of view, it similar to one semi-persistent scheduled CSI-RS transmission.
  • FIG. 5 provides an example CSI-RS measurement configuration for a UE1 500 having a single one-time window configuration.
  • the one-time window 502 is the only opportunity for the UE1 500 to measure the CSI-RS, derive CQI, and report it to the base station.
  • the remaining portion of the pattern 504, may be used for the base station to schedule a different UE.
  • these measurement patterns from FIG. 4 and FIG. 5 may be used in conjunction by the base station to schedule different user equipments to the same resource pool RS/ZP-CSI-RS resource pool.
  • the example measurement patterns described above are only example, and other patterns may be used.
  • the CSI-RS measurement pattern may be periodic or aperiodic depending on the base station determination and configuration.
  • one measurement pattern may be the default measurement pattern so that no configuration is needed by the base station.
  • the signalling from the base station to the user equipment of the measurement pattern may be done in two ways: a semi-static RRC command; and a dynamic MAC or a physical DL control command.
  • the signalled information may comprise an indication of the common resource pool.
  • the indication may include at least one of: a CSI-RS/ZP CSI-RS resource location, a resource index, a measured antenna port, a time period, etc. Additionally, this indication would indicate one UE specific CSI-RS/ZP-CSI-RS pattern to the UE. If the pattern is a one-time window (as described above with reference to FIG. 5) an alternative indication using dynamic signalling to activate and stop CSI-RS measurement may be used.
  • the indication of the measurement pattern is UE specific, whereas the common resource pool may be specific to a cell or a group UEs.
  • One UE may have one or multiple CSI-RS measurement patterns for RRC configuration.
  • the indication may be sent via a MAC command or downlink physical control indicator to inform UE.
  • Dynamic signaling comprises limited information bits, used to fast trigger UE to measure CSI-RS/ZP-CSI-RS and report CQI. Dynamic signaling may also be used to indicate one of multiple CSI-RS measurement pattern.
  • the signaling may be UE specific or group UE specific. This means dynamic sharing may be allowed witthin one group of UEs or among multiple groups of UEs.
  • RRC signaling and dynamic signaling may be combined or only RRC signaling may be used.
  • only RRC signaling is enough to support multiple users to share same CSI-RS resource, and there is no need to change CSI-RS resource index or CSI-RS measurement pattern.
  • two users may be configured to have ON-OFF inter-locked measurement pattern to share same CSI-RS/ZP-CSI-RS resource.
  • FIG. 6 is a logic flow diagram for a dynamic CSI-RS sharing scheme. This figure further illustrates the operation of an exemplary method, a result of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and/or interconnected means for performing functions in accordance with exemplary embodiments.
  • the Measurement Module 140 may include multiples ones of the blocks in FIG. 6, where each included block is an interconnected means for performing the function in the block.
  • the blocks in FIG. 6 are assumed to be performed by the UE 110, e.g., under control of the Measurement Module 140 at least in part.
  • an example method may comprise: receiving, by a user equipment, measurement information comprising an indication of a resource pool corresponding to communication resources and a user specific measurement pattern for measuring at least one reference signal, wherein the communication resources are shared by a plurality of user equipments as indicated by block 602; measuring quality information based on the at least one reference signal according to the user specific measurement pattern as indicated by block 604; and transmitting, via the shared communication resources, a measurement report based at least on the measuring as indicated by block 606.
  • the at least one reference signal may be at least one of: a channel state information reference signal (CSI-RS) for measurement of channel information; and a zero-power channel state information reference signal (ZP-CSI-RS) for measurement of interference information.
  • the indication of the assigned resource pool may be received via radio resource control (RRC) signaling, and wherein the indication comprises at least one of: an allocation of the communication resource corresponding to the assigned resource pool; a resource index; at least one antenna port to be measured; and a time period.
  • the method may further comprise: receiving a rate matching pattern information comprising one or more resource pools, and performing rate matching according to the indicated rate matching pattern.
  • the communication resources may be shared by the plurality of user equipments using at least one of: time division multiplexing (TDM) and frequency division multiplexing (FDM) .
  • the user specific measurement pattern may be at least one of: a periodic CSI measurement pattern; a one-time window measurement pattern; a CSI measurement pattern including a fractional time resource of one periodic CSI-RS resource; a CSI measurement pattern including a fractional frequency resource of one periodic CSI-RS resource.
  • the user specific measurement pattern may be received via at least one of: radio resource control signaling, media access control signaling and physical layer signaling.
  • An example apparatus comprising at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to: receive, by a user equipment, measurement information comprising an indication of a resource pool corresponding to communication resources and a user specific measurement pattern for measuring at least one reference signal, wherein the communication resources are shared by a plurality of user equipments; measure quality of the at least one reference signal according to the user specific measurement pattern; and transmit, via the shared communication resources, a measurement report based at least on the measuring.
  • the at least one reference signal may be at least one of: a channel state information reference signal (CSI-RS) for measurement of channel state information; and a zero-power channel state information reference signal (ZP-CSI-RS) for measurement of interference information.
  • CSI-RS channel state information reference signal
  • ZP-CSI-RS zero-power channel state information reference signal
  • the indication of the assigned resource pool is received via radio resource control (RRC) signaling, and wherein the indication may comprise at least one of: an allocation of the communication resource corresponding to the assigned resource pool; a resource index; at least one antenna port to be measured; and a time period.
  • RRC radio resource control
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to: receive a rate matching pattern information comprising one or more resource pools, and perform rate matching according to the indicated rate matching pattern.
  • the user specific measurement pattern may be at least one of: a periodic CSI measurement pattern; a one-time window measurement pattern; a CSI measurement pattern including a fractional time resource of one periodic CSI-RS resource; a CSI measurement pattern including a fractional frequency resource of one periodic CSI-RS resource.
  • An example embodiment may be provided in a non-transitory program storage device, such as memory (ies) 125 shown in Fig. 1 for example, readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations comprising: receiving, by a user equipment, measurement information comprising an indication of a resource pool corresponding to communication resources and a user specific measurement pattern for measuring at least one reference signal, wherein the communication resources are shared by a plurality of user equipments; measuring quality information based on the at least one reference signal according to the user specific measurement pattern; and transmitting, via the shared communication resources, a measurement report based at least on the measuring.
  • a user equipment measurement information comprising an indication of a resource pool corresponding to communication resources and a user specific measurement pattern for measuring at least one reference signal, wherein the communication resources are shared by a plurality of user equipments
  • measuring quality information based on the at least one reference signal according to the user specific measurement pattern
  • transmitting via the shared communication resources, a measurement report based
  • FIG. 7 is a logic flow diagram for a dynamic CSI-RS sharing scheme. This figure further illustrates the operation of an exemplary method, a result of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and/or interconnected means for performing functions in accordance with exemplary embodiments.
  • the Configuration Module 150 may include multiples ones of the blocks in FIG. 7, where each included block is an interconnected means for performing the function in the block.
  • the blocks in FIG. 7 are assumed to be performed by a base station such as eNB 170, e.g., under control of the Configuration Module 150 at least in part.
  • an example method may comprise dividing communication resources into a plurality of resource pools for transmission of at least one reference signal as indicated by block 702; determining a user specific measurement pattern for each of a plurality of user equipments as indicated by block 704; assigning the plurality of user equipments to one of the resource pools as indicated by block 706; and transmitting an indication of the assigned resource pool and the user specific measurement pattern to each of the plurality of user equipments to configure the plurality of user equipments to measure and report quality information using the communication resource within the assigned resource pool as indicated by block 708.
  • the at least one reference signal may be at least one of: a channel state information reference signal (CSI-RS) for measurement of channel information; and a zero-power channel state information reference signal (ZP-CSI-RS) for measurement of interference information.
  • CSI-RS channel state information reference signal
  • ZP-CSI-RS zero-power channel state information reference signal
  • the different user specific measurement patterns may be determined based on whether the at least one reference signal is a CSI-RS or a ZP-CSI-RS.
  • the user specific measurement pattern may be based at least on traffic characteristics of the respective user equipments.
  • the determining may further comprise determining a different user specific measurement pattern for a first user equipment of the plurality of user equipments and a second user equipment of the plurality of user equipments based on different traffic characteristics of the first user equipment and the second user equipment.
  • the plurality of user equipments may share the communication resources corresponding to the assigned resource pool using at least one of: time division multiplexing (TDM) and frequency division multiplexing (FDM) .
  • the indication of the assigned resource pool may be transmitted via radio resource control (RRC) signaling, and the indication may comprise at least one of: an allocation of the communication resource corresponding to the assigned resource pool; a resource index; at least one antenna port to be measured; and a time period.
  • the user specific measurement pattern may be at least one of: a periodic CSI measurement pattern, a one-time window measurement pattern; a fractional time, and a frequency resource to measure within one periodic CSI-RS resource.
  • the user specific measurement pattern may be transmitted via at least one of: radio resource control signaling, media access control signaling and physical layer signaling.
  • the method may further comprise transmitting an indication of a rate matching pattern, wherein the rate matching pattern may comprise one or multiple resource pools.
  • the method may further comprise: transmitting the at least one reference signal; and receiving a measurement report based on the assigned resource pool and the user specific measurement pattern comprising the quality information from at least one user equipment.
  • An example apparatus comprising at least one processor; and at least one non-transitory memory including computer program code, the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to: divide communication resources into a plurality of resource pools for transmission of at least one reference signal; determine a user specific measurement pattern for each of a plurality of user equipments; assign the plurality of user equipments to one of the resource pools; and transmit an indication of the assigned resource pool and the user specific measurement pattern to each of the plurality of user equipments to configure the plurality of user equipments to measure and report quality information using the communication resource within the assigned resource pool.
  • the at least one reference signal may be at least one of: a channel state information reference signal (CSI-RS) for measurement of channel information; and a zero-power channel state information reference signal (ZP-CSI-RS) for measurement of interference information.
  • CSI-RS channel state information reference signal
  • ZP-CSI-RS zero-power channel state information reference signal
  • the different user specific measurement patterns may be determined based on whether the at least one reference signal is a CSI-RS or a ZP-CSI-RS.
  • the user specific measurement pattern may be based at least on traffic characteristics of the respective user equipments.
  • the determination of the user specific measurement pattern for each of a plurality of user equipments may comprise determining a different user specific measurement pattern for a first user equipment of the plurality of user equipments and a second user equipment of the plurality of user equipments based on different traffic characteristics of the first user equipment and the second user equipment.
  • the indication of the assigned resource pool may be transmitted via radio resource control (RRC) signaling, and wherein the indication may comprise at least one of:an allocation of the communication resource corresponding to the assigned resource pool; a resource index; at least one antenna port to be measured; and a time period.
  • the user specific measurement pattern may be at least one of: a periodic CSI measurement pattern, a one-time window measurement pattern; a fractional time, and a frequency resource to measure within one periodic CSI-RS resource.
  • the user specific measurement pattern may be transmitted via at least one of: radio resource control signaling, media access control signaling and physical layer signaling.
  • the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to: transmit an indication of a rate matching pattern, wherein the rate matching pattern comprises one or multiple resource pools.
  • An example embodiment may be provided in a non-transitory program storage device, such as memory (ies) 155 shown in Fig. 1 for example, readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations comprising: dividing communication resources into a plurality of resource pools for transmission of at least one reference signal; determining a user specific measurement pattern for each of a plurality of user equipments; assigning the plurality of user equipments to one of the resource pools; and transmitting an indication of the assigned resource pool and the user specific measurement pattern to each of the plurality of user equipments to configure the plurality of user equipments to measure and report quality information using the communication resource within the assigned resource pool.
  • a non-transitory program storage device such as memory (ies) 155 shown in Fig. 1 for example, readable by a machine, tangibly embodying a program of instructions executable by the machine for performing operations, the operations comprising: dividing communication resources into a plurality of resource pools for transmission of at least one reference signal
  • An example embodiment may be provided in a communication system including an apparatus in accordance with paragraph 0050 and an apparatus in accordance with paragraph 0056 above, for example.
  • a technical effect of one or more of the example embodiments disclosed herein is that different UEs will share one common resource pool thus increasing CSI-RS utilization efficiency significantly.
  • Providing a common CSI-RS and NZP CSI-RS resource pool not only improves single user flexibility, but also upgrades system efficiency from the whole network prospective.
  • Embodiments herein may be implemented in software (executed by one or more processors) , hardware (e.g., an application specific integrated circuit) , or a combination of software and hardware.
  • the software e.g., application logic, an instruction set
  • a “computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in FIG. 1.
  • a computer-readable medium may comprise a computer-readable storage medium (e.g., memories 125, 155, 171 or other device) that may be any media or means that can contain, store, and/or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • a computer-readable storage medium does not comprise propagating signals.
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.
  • eNB or eNodeB evolved Node B (e.g., an LTE base station)
  • UE user equipment e.g., a wireless, typically mobile device

Abstract

L'invention concerne un procédé qui consiste à diviser des ressources de communication en une pluralité de groupes de ressources en vue de la transmission d'au moins un signal de référence ; déterminer un modèle de mesure spécifique d'utilisateur pour chaque équipement utilisateur d'une pluralité d'équipements utilisateurs ; attribuer la pluralité des équipements utilisateurs à l'un des groupes de ressources ; et transmettre une indication du groupe de ressources attribué et du modèle de mesure spécifique d'utilisateur à chacun de la pluralité des équipements utilisateurs pour configurer la pluralité des équipements utilisateurs afin que ceux-ci mesurent et notifient des informations de qualité à l'aide de la ressource de communication au sein du groupe de ressources attribué.
PCT/CN2016/082814 2016-05-20 2016-05-20 Protocole de partage dynamique de csi-rs WO2017197642A1 (fr)

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