EP3942706A1 - Noeud de réseau radio et procédé réalisé dans celui-ci permettant de gérer une transmission dans un réseau de communication sans fil - Google Patents

Noeud de réseau radio et procédé réalisé dans celui-ci permettant de gérer une transmission dans un réseau de communication sans fil

Info

Publication number
EP3942706A1
EP3942706A1 EP19920976.8A EP19920976A EP3942706A1 EP 3942706 A1 EP3942706 A1 EP 3942706A1 EP 19920976 A EP19920976 A EP 19920976A EP 3942706 A1 EP3942706 A1 EP 3942706A1
Authority
EP
European Patent Office
Prior art keywords
network node
radio network
load
served
wireless devices
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19920976.8A
Other languages
German (de)
English (en)
Inventor
Niklas JALDÉN
David Astely
Nafiseh SHARIATI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP3942706A1 publication Critical patent/EP3942706A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H04W16/08—Load shedding arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • 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
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • 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
    • H04B7/0617—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 for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

Definitions

  • Embodiments herein relate to a radio network node and method performed therein for wireless communication.
  • embodiments herein relate to handling a transmission, e.g. performing a beamformed transmission of data, in a wireless communication network.
  • wireless devices also known as wireless communication devices, mobile stations, stations (STA) and/or user equipments (UE), may communicate via a Radio Access Network (RAN) to one or more core networks (CN).
  • the RAN covers a geographical area which is divided into service areas, also known as cells, with each cell being served by a radio network node e.g., a Wi-Fi access point or a radio base station (RBS), which in some networks may also be called, for example, a NodeB, an eNodeB or a gNodeB.
  • the cell is a geographical area where radio coverage is provided by the radio network node.
  • the radio network node operates on radio frequencies to communicate over an air interface with the wireless devices within range of the radio network node.
  • the radio network node communicates over a downlink (DL) to the wireless device and the wireless device communicates over an uplink (UL) to the radio network node.
  • DL downlink
  • UL uplink
  • a Universal Mobile Telecommunications network is a third generation (3G) telecommunications network, which evolved from the second generation (2G) Global System for Mobile Communications (GSM).
  • the UMTS terrestrial radio access network (UTRAN) is essentially a RAN using wideband code division multiple access (WCDMA) and/or High Speed Packet Access (HSPA) for user equipments.
  • WCDMA wideband code division multiple access
  • HSPA High Speed Packet Access
  • 3GPP Third Generation Partnership Project
  • telecommunications suppliers propose and agree upon standards for e.g. third generation networks, and investigate enhanced data rate and radio capacity and upcoming generation networks.
  • 3GPP Third Generation Partnership Project
  • radio network nodes may be connected, e.g., by landlines or microwave, to a controller node, such as a radio network controller (RNC) or a base station controller (BSC), which supervises and coordinates various activities of the plural radio network nodes connected thereto.
  • RNC radio network controller
  • BSC base station controller
  • This type of connection is sometimes referred to as a backhaul connection.
  • the RNCs and BSCs are typically connected to one or more core networks.
  • EPS Evolved Packet System
  • the EPS comprises the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), also known as the Long Term Evolution (LTE) radio access network, and the Evolved Packet Core (EPC) network, also known as System Architecture Evolution (SAE) core network.
  • E-UTRAN/LTE is a variant of a 3GPP radio access network wherein the radio network nodes are directly connected to the EPC network rather than to RNCs.
  • the functions of an RNC are distributed between the radio network nodes, e.g.
  • the RAN of an EPS has an essentially“flat” architecture comprising radio network nodes connected directly to one or more core networks, i.e. they are not connected to RNCs.
  • the E- UTRAN specification defines a direct interface between the radio network nodes, this interface being denoted the X2 interface.
  • Transmit-side beamforming means that the transmitter can amplify the transmitted signals in a selected direction or from selected directions, while suppressing the transmitted signals in other directions.
  • a receiver can amplify signals from a selected direction or from selected directions, while suppressing unwanted signals from other directions.
  • Future wireless communication networks for example NR and evolutions of LTE, are expected to provide ubiquitous high data-rate coverage. Achieving this requires an efficient use of the available resources.
  • higher number of antenna elements, at the transmitter and at the receiver are considered in future standards of, for example, LTE and NR.
  • With multiple antennas at the transmitter and/or the receiver it is possible to exploit the spatial degrees of freedom offered by the multipath fading inside the wireless channel in order to provide a substantial increase in the data rates and reliability of wireless transmission.
  • the downlink there are three basic approaches for utilizing the antenna: diversity, multiplexing and beamforming.
  • the radiation pattern of the antennas may be controlled by transmitting a signal from a plurality of elements with an element specific gain and phase, referred to as a beam.
  • a beam an element specific gain and phase
  • radiation patterns, beams, with different pointing directions and beam widths in both elevation and azimuth directions may be created depending on the structure of the array.
  • the gains from adjusting the beam shapes used for transmissions come from both increased received power e.g. increased signal to noise ratio (SNR), as well as a possibly lower received interference e.g. increased signal interference plus noise ratio (SINR), in a multi cell scenario.
  • SNR signal to noise ratio
  • SINR signal interference plus noise ratio
  • a precoder, W used for transmitting information to a wireless device, k, is a function of the current knowledge of the cannel, H k, between radio network node and the wireless device, as well as knowledge of the channel (or statistics of the channel) Q j to possible interfered wireless device, That is:
  • Fig. 1 A illustrates array gain along the y-axis and the angle along the x-axis.
  • FIG. 1 A shows a first beampattern intended for a wireless device in a left graph, and a second beampattern intended for the wireless device minimizing the interference to a secondary wireless device in a right graph.
  • the first and second wireless device locations are indicated by the respective black and dashed lines.
  • the black line indicates the direction of the beam towards the intended wireless device
  • the dashed line indicates a direction towards an interfered wireless device served by a different radio network node.
  • Fig. 1 B An illustration of this is given in Fig. 1 B.
  • case A a non-interference-mitigating scheme is used by both eNB1 and eNB 2.
  • UE1 and UE2 have a decent performance since both serving sites do their best to serve its own UEs but they are both interfered by each other’s beam.
  • This case A is illustrative of a textbook state of the art.
  • eNB1 applies an interference mitigating scheme, but not eNB2. This results in an increased performance for UE2, due to the decreased interference form eNB1 , at the cost of a decreased performance for its own target user, UE1.
  • Case C both cells apply an interference mitigating scheme, and the net result is an increased performance for both UE1 and UE2 compared to case A.
  • applying interference mitigating schemes may not affect the performance of the served wireless devices.
  • An object herein is to provide a mechanism to handle a transmission in an efficient manner in a wireless communication network.
  • the object is achieved, according to embodiments herein, by providing a method performed by a first radio network node for handling transmission of data in a wireless communication network.
  • the first radio network node determines a first load of the first radio network node, and obtains an indication of a second load of a second radio network node.
  • the first radio network node further selects one or more transmission parameters for one or more beams based on the determined first load and the obtained indication of the second load.
  • the first radio network node further performs a transmission of data to a wireless device using the selected one or more transmission parameters and the one or more beams.
  • a computer program product comprising instructions, which, when executed on at least one processor, cause the at least one processor to carry out the method above, as performed by the first radio network node. It is additionally provided herein a computer-readable storage medium, having stored thereon the computer program product comprising instructions which, when executed on at least one processor, cause the at least one processor to carry out the method above, as performed by the first radio network node.
  • the object is achieved, according to embodiments herein, by providing a first radio network node for handling transmission of data in a wireless communication network.
  • the first radio network node is configured to determine a first load of the first radio network node, and to obtain an indication of a second load of a second radio network node.
  • the first radio network node is further configured to select one or more transmission parameters for one or more beams based on the determined first load and the obtained indication of the second load.
  • the first radio network node is also configured to perform a transmission of data to a wireless device using the selected one or more transmission parameters and the one or more beams.
  • a beamforming scheme that balances the received signal power, such as energy, received, e.g. as indicated by signal strength, at wireless devices in the first cell against the interference created to one or more neighbouring cells, where the interference suppression is adjusted based on the first load in the current cell and the second load in interfered cell(s).
  • Fig. 1 A is a schematic overview depicting gain of different beams or directions of signals;
  • Fig. 1 Bis a schematic overview depicting scenarios of beamforming according to prior art;
  • Fig. 2 is a schematic overview depicting a wireless communication network according to embodiments herein;
  • Fig. 3 shows a combined flowchart and signalling scheme according to embodiments herein;
  • Fig. 4 shows a combined flowchart and signalling scheme according to embodiments herein;
  • Fig. 5 shows a schematic flowchart depicting a method performed by a radio network node according to embodiments herein;
  • Fig. 6 is a block diagram depicting a radio network node according to embodiments herein;
  • Fig. 7 shows a telecommunication network connected via an intermediate network to a host computer in accordance with some embodiments
  • Fig. 8 shows a host computer communicating via a base station with a user equipment over a partially wireless connection in accordance with some embodiments
  • Fig. 9 shows methods implemented in a communication system including a host
  • Fig. 10 shows methods implemented in a communication system including a host
  • Fig. 1 1 shows methods implemented in a communication system including a host
  • Fig. 12 shows methods implemented in a communication system including a host
  • Embodiments herein relate to wireless communication networks in general.
  • Fig. 2 is a schematic overview depicting a wireless communication network 1.
  • the wireless communication network 1 comprises one or more RANs and one or more CNs.
  • the wireless communication network 1 may use one or a number of different technologies.
  • Embodiments herein relate to recent technology trends that are of particular interest in a 5G context, e.g. for an NR system, however, embodiments are also applicable in further development of existing wireless communication systems such as e.g. LTE and Wideband Code Division Multiple Access (WCDMA).
  • WCDMA Wideband Code Division Multiple Access
  • wireless devices are configured to communicate with one another e.g.
  • a wireless device 10 such as a mobile station, a non-access point (non-AP) STA, a STA, a user equipment and/or a wireless terminal, may be configured for communication.
  • non-AP non-access point
  • STA STA
  • user equipment a wireless terminal
  • Machine Type Communication (MTC) device Device to Device (D2D) terminal, or node e.g. smart phone, laptop, mobile phone, sensor, relay, mobile tablets or even a small base station capable of communicating using radio communication with a radio network node or a wireless device.
  • MTC Machine Type Communication
  • D2D Device to Device
  • node e.g. smart phone, laptop, mobile phone, sensor, relay, mobile tablets or even a small base station capable of communicating using radio communication with a radio network node or a wireless device.
  • the wireless communication network 1 comprises a first radio network node 12 , also referred to as the radio network node, providing radio coverage over a geographical area, a first service area 11 also known as a first cell, of a first radio access technology (RAT), such as LTE or NR or similar.
  • the first radio network node 12 may be a
  • a transmission and reception point such as an access node, an access controller, a base station, e.g. a radio base station such as a gNodeB (gNB), an evolved Node B (eNB, eNode B), a NodeB, a base transceiver station, a radio remote unit, an Access Point Base Station, a base station router, a Wireless Local Area Network (WLAN) access point or an Access Point Station (AP STA), a transmission arrangement of a radio base station, a stand-alone access point or any other network unit or node capable of communicating with a wireless device within the area served by the first radio network node 12 depending e.g. on the first radio access technology and terminology used.
  • the first radio network node 12 may be referred to as a serving radio network node wherein the first service area 1 1 may be referred to as a serving cell, and the first radio network node 12 communicates with the wireless device 10 in form of DL transmissions to the wireless device 10 and UL transmissions from the wireless device 10. It should be noted that a service area may be denoted as cell, beam, beam group or similar to define an area of radio coverage.
  • the wireless communication network 1 comprises a second radio network node 13, also referred to as another radio network node, providing radio coverage over a geographical area, a second service area 11 also referred to as a second cell, of a second radio access technology (RAT), such as NR or LTE or similar.
  • the first and second RAT may be the same or different.
  • the second radio network node 13 may be a transmission and reception point such as an access node, an access controller, a base station, e.g.
  • a radio base station such as a gNodeB (gNB), an evolved Node B (eNB, eNode B), NodeB, a base transceiver station, a radio remote unit, an Access Point Base Station, a base station router, a Wireless Local Area Network (WLAN) access point or an Access Point Station (AP STA), a transmission arrangement of a radio base station, a stand-alone access point or any other network unit or node capable of communicating with a wireless device within the area served by the second radio network node 13 depending e.g. on the second RAT and terminology used.
  • the second radio network node may be denoted as neighbouring radio network node and the second cell may be denoted as neighbouring cell.
  • Each radio network node beamforms data transmission towards one or more wireless devices served by respective radio network node. Beamforming allows the signal to be stronger for an individual connection. On the transmit-side this may be achieved by a concentration of the transmitted power in the desired direction(s), and on the receive- side this may be achieved by an increased receiver sensitivity in the desired direction(s). This beamforming enhances throughput and coverage of the connection. It also allows reducing the interference such as unwanted signals, thereby enabling several
  • the first radio network node 12 beamforms its transmissions towards e.g. the wireless device 10 and the second radio network node 13 may beamform its transmissions towards e.g. a second wireless device 15.
  • MIMO Multiple Input Multiple Output
  • the fist radio network node 12 may perform a transmission towards the wireless device 10, wherein the transmission is beamformed by using one or more transmission parameters such as phase and/or amplitude of antenna elements.
  • the first radio network node 12 may further apply an interference mitigating scheme for its beamformed transmissions towards the wireless device 10 to reduce interference to wireless devices served by other beams of other radio network nodes.
  • the one or more transmission parameters, used for the beamformed transmissions may thus be selected to mitigate interference to other wireless devices, such as the second wireless device 15, served by the second radio network node 13.
  • the first radio network node 12 determines a first load of the first radio network node e.g. determines number of currently active wireless devices or amount of resources used.
  • the first radio network node 12 further obtains, e.g. receives, an indication of a second load of the second radio network node 13 e.g.
  • the first radio network node 12 selects one or more transmission parameters for one or more beam transmissions in the first cell taking the first load and the second load into account. For example, in case the first radio network node 12 has a higher load than the second radio network node 13, the first radio network node may reduce the degree of interference mitigation towards, or with respect to, beams of the second radio network node 13.
  • the degree (also referred to as level) of interference mitigation may depend on the load in the current cell, e.g. the first cell, as well as the load in the neighboring second cell or cells. This provides a better balance in utilization of e.g. radio resources or serving UEs, between cells in a wireless
  • neighbouring cells where the interference suppression is adjusted based on the load in the current cell and the load in the interfered cells, e.g. the neighbouring cells.
  • Fig. 3 is a combined flowchart and signaling scheme according to embodiments herein.
  • the wireless device 10 transmits a signal or similar to the first radio network node 12.
  • the signal may be a reference signal or similar.
  • One or more wireless devices may be communicating with the first radio network node 12.
  • the first radio network node 12 may then determine the first load of the first radio network node 12 e.g. a load of a first beam or similar.
  • the first radio network node 12 and the second radio network node 13 may then exchange information indicating the respective load of the radio network nodes or beams.
  • the information may be obtained by signalling between radio network nodes over any interface such as the X2 interface.
  • the information may also be retrieved or received from another network node such as an operation and maintenance node, a core network node or similar.
  • the first radio network node 12 selects one or more transmission parameters, such as phase and/or amplitude over antenna elements, of the first radio network node 12 taking the first load and the second load into account.
  • the first radio network node 12 may select the one or more transmission parameters based on the first load relative the second load. Furthermore, the channel information may also be taken into account.
  • the first radio network node 12 then uses the selected one or more transmission parameters when performing beamformed transmission towards the wireless device 10. Hence, the first radio network node 12 may adapt beams towards one or more wireless devices based on whether the load in one or more neighbouring radio network nodes and/or neighbouring beams is high or low relative the load in the first radio network node 12.
  • Fig. 4 is a combined flowchart and signaling scheme according to embodiments herein.
  • the wireless device 10 transmits a signal to the first radio network node 12.
  • the signal may be a reference signal or similar.
  • One or more wireless devices may be communicating with the first radio network node 12. This signal or signals may be used to determine channel state information for communication with the wireless device 10.
  • the first radio network node 12 may then determine the channel state information for the communication with the wireless device 10 and/or load in the first radio network node 12. E.g. the first radio network node 12 may then determine the load in the radio network node 12 e.g. amount of used resources out of a capacity of resources.
  • the first radio network node 12 exchanges, with the second radio network node 13, information representing or indicating utilization, such as level of resources used or served wireless devices, and thus load of the respective radio network node.
  • the information may further comprise channel state information for links to served and potentially interfered wireless devices.
  • respective radio network node may obtain information relating to served wireless devices and potentially interfered wireless devices by exchanging information over e.g. X2 interface.
  • the first radio network node 12 may then calculate a scaling factor also denoted as an interference mitigation scaling factor a. This scaling factor may be based on the loads relative one another or based on respective load of the radio network nodes.
  • the first radio network node 12 may further calculate a precoder such as a downlink precoder to be used when transmitting data to one or more wireless devices 10 served by the first radio network node 12 using beamformed transmissions.
  • the first radio network node 12 may thus calculate a precoder given channel state information for served wireless devices and/or interfered wireless devices, and the scaling factor a.
  • the first radio network node 12 may then use the calculated precoder when performing beamformed transmission towards the wireless device 10.
  • the proposed scheme balances the utilization in the network in a better way and improves the radio conditions for wireless devices in overloaded cells and boosts overall system
  • the method actions performed by the first radio network node 12 for handling transmission of data in the wireless communication network will now be described with reference to a flowchart depicted in Fig. 5.
  • the actions do not have to be taken in the order stated below, but may be taken in any suitable order.
  • the first radio network node 12 determines the first load of the first radio network node 12. Measures or metrics of a current load in the system could for example be number of currently connected or active wireless devices in the respective cell. As another example, it could be information of the fraction of time and/or frequency resources used out of available time and/or frequency resources of the first radio network node 12. E.g. the number of resource blocks used per transmission time interval (TTI) and the number of TTI’s used for data transmission for currently active wireless devices.
  • TTI transmission time interval
  • the first radio network node 12 obtains the indication of the second load of the second radio network node 13.
  • the first radio network node 12 may receive data, such as a value, an index, or a flag value, indicating a load or a level of load from the second radio network node 13.
  • the indication may thus indicate level of load, a value of load or be a one-bit indication indicating a load above a threshold.
  • the indication may be information exchanged, e.g. transmitted, between the radio network nodes e.g. performed by information sharing between neighbouring radio network nodes over, for example, the X2 interface.
  • the first and second loads may be represented by a current number of active users in the respective cell balanced with an average path loss.
  • the path loss is a metric that may represent averaged received power from a UE and may be one of the channel information metrics which is used for calculating the precoder.
  • the first radio network node 12 may further select one or more transmission parameters for one or more beams used by the first network node 12 based on the determined first load and the obtained indication of the second load, or the second load as indicated by the obtained indication.
  • the first radio network node 12 may in addition select one or more transmission parameters for the one or more beams by taking also interference caused, by the use of the one or more beams for transmissions by the first radio network node 12, to one or more wireless devices 15 served by the second radio network node 13, into account.
  • the first radio network node 12 may utilize information of the first load in the current cell and information of the second load in adjacent cells to decide how much effort should be spent on suppressing interference to be nice to neighboring cells or nodes.
  • the one or more transmission parameters may be selected to provide a degree, e.g. in terms of the scaling factor, of interference mitigation to or for one or more wireless devices served 15 by the second radio network node 13.
  • the first radio network node 12 may select the one or more transmission parameters for the one or more beams by calculating a precoder based on channel state information for one or more wireless devices 10 served by the first radio network node 12, and based on the scaling factor for taking the first load and the second load into account. In short a precoder calculation
  • interference mitigation scaling factor a is modified by accounting for the scaling factor denoted as interference mitigation scaling factor a, according to
  • a bNB 2 ⁇ a bNB ⁇ if the utilization for the second radio network node 13, denoted as eNB2, is higher than the utilization for the first radio network node 12, denoted as eNB1 , as may be the case in scenario B in Fig. 1 B.
  • the utilization indicates the load.
  • the absolute levels of load and interference in the cell may further be taken into account when setting the cell individual a eNBi . Further one may add some level of hysteresis in the settings such that a decreased a bNB ⁇ does not result in an higher utilization for second radio network node 13 than for the first radio network node 12.
  • the one or more transmission parameters may be selected to provide a first degree of interference mitigation for one or more wireless devices 15 served by the second radio network node 13 when the first load is lower than the second load, and with the proviso that the first load is equal to or higher than the second load, the one or more transmission parameters may be selected to provide a second degree of interference mitigation for one or more wireless devices 15 served by the second radio network node 13, wherein the first degree is higher than the second degree.
  • the scaling factor used by the first radio network node 12 for mitigating interference may be set very low, whereas when the second radio network node 13 is highly loaded as compared to the first radio network node 12, the scaling factor used by the first radio network node 12 for mitigating interference may be set to a higher value.
  • the one or more transmission parameters may be selected to provide a signal strength or signal quality above a threshold, e.g. to maximize the signal strength, for the one or more wireless devices 10 served by the one or more beams used, e.g. generated or transmitted, by the first radio network node 12 when the first load is higher than the second load. Interference caused to one or more wireless devices served by the second beam may then be ignored or the degree of interference mitigation provided to one or more wireless devices 15 served by the second radio network node 13, may be set below a degree threshold, e.g. minimized such as set to zero.
  • the first radio network node 12 performs the transmission of data to the wireless device 10 using the selected one or more transmission parameters and the one or more beams.
  • the proposed scheme balances the utilization in the network in a better way. This in turn improves the radio conditions for wireless devices in overloaded cells and boosts overall system performance.
  • Fig. 6 is a block diagram depicting the radio network node 12 for handling communication according to embodiments herein.
  • the radio network node 12 may comprise processing circuitry 601 , e.g. one or more processors, configured to perform the methods herein.
  • processing circuitry 601 e.g. one or more processors, configured to perform the methods herein.
  • the first radio network node 12 may comprise a determining unit 602.
  • the first radio network node 12, the processing circuitry 601 , and/or the determining unit 602 is configured to determine the first load of the first radio network node 12.
  • the first radio network node 12 may comprise an obtaining unit 603., e.g. a communication module for communication via a communication or network interface such as an X2 interface, or a receiver module or a transceiver module.
  • the first radio network node 12, the processing circuitry 601 , and/or the obtaining unit 603 is configured to obtain the indication of the second load of the second radio network node 13. It should here be noted that the first radio network node 12 may obtain load of a number of other radio network nodes.
  • the radio network node 12 may comprise a selecting unit 604.
  • the radio network node 12, the processing circuitry 601 , and/or the selecting unit 604 is configured to select the one or more transmission parameters based on the first and second loads, i.e.
  • the radio network node 12, the processing circuitry 601 , and/or the selecting unit 604 may be configured to select the one or more transmission parameters for the one or more beams by further taking interference caused to one or more wireless devices 15 served by the second radio network node 13, into account.
  • the radio network node 12, the processing circuitry 601 , and/or the selecting unit 604 may be configured to select the one or more transmission parameters to provide a degree of interference mitigation for one or more wireless devices 15 served by the second radio network node 13. E.g.
  • the radio network node 12, the processing circuitry 601 , and/or the selecting unit 604 may be configured to select the one or more transmission parameters to provide a first degree of interference mitigation for one or more wireless devices 15 served by the second radio network node 13 when the first load is lower than the second load, and with the proviso that the first load is equal to or higher than the second load, the radio network node 12, the processing circuitry 601 , and/or the selecting unit 604 may be configured to select the one or more transmission parameters to provide a second degree of interference mitigation for one or more wireless devices 15 served by the second radio network node 13, wherein the first degree is higher than the second degree.
  • the radio network node 12, the processing circuitry 601 , and/or the selecting unit 604 may be configured to select the one or more transmission parameters to provide a signal strength or signal quality above a threshold for the one or more wireless devices 10 served by the one or more beams used, e.g. generated or transmitted, by the first radio network node 12 when the first load is higher than the second load. Interference caused to one or more wireless devices 15 served by the second radio network node 13 may then be ignored or the degree of interference mitigation for one or more wireless devices 15 served by the second radio network node 13 may be set below a degree threshold.
  • the radio network node 12, the processing circuitry 601 , and/or the selecting unit 604 may be configured to select the one or more transmission parameters for the one or more beams by calculating a precoder based on channel state information for one or more wireless devices 10 served by the first radio network node 12, and based on the scaling factor for taking the first load and the second load into account.
  • the first radio network node 12 may comprise a performing unit 605., e.g. a transmitter module or a transceiver module, e.g. with a number of antenna elements.
  • the first radio network node 12, the processing circuitry 601 , and/or the performing unit 605 is configured to perform the transmission of data to the wireless device 10 using the selected one or more transmission parameters and the one or more beams.
  • the first radio network node 12 further comprises a memory 606.
  • the memory comprises one or more units to be used to store data on, such as indications, mitigation processes, gain and/or phase adjustments, precoder information, loads, indication of loads, scaling factors, applications to perform the methods disclosed herein when being executed, and similar.
  • the methods according to the embodiments described herein for the first radio network node 12 are respectively implemented by means of e.g. a computer program product 607 or a computer program, comprising instructions, i.e., software code portions, which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the first radio network node 12.
  • the computer program product 607 may be stored on a computer-readable storage medium 608, e.g. a disc, a universal serial bus (USB) stick or similar.
  • the computer- readable storage medium 608, having stored thereon the computer program product may comprise the instructions which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the first radio network node 12.
  • the computer-readable storage medium may be a transitory or a non-transitory computer-readable storage medium.
  • the first radio network node 12 may further comprise a communication interface comprising transmitter, receiver, transceiver, a network interface, e.g. an Xn interface and/or an X2 interface, and/or one or more antennas.
  • a more general term“radio network node” is used and it can correspond to any type of radio-network node or any network node, which
  • network nodes communicates with a wireless device and/or with another network node.
  • network nodes are NodeB, gNodeB, eNodeB, Master eNB, Secondary eNB, a network node belonging to Master cell group (MCG) or Secondary cell group (SCG), base station (BS), multi-standard radio (MSR) radio node such as MSR base station, network controller, radio-network controller (RNC), base station controller (BSC), relay, donor node controlling relay, base transceiver station (BTS), access point (AP), transmission points, transmission nodes, Remote radio Unit (RRU), Remote Radio Head (RRH), nodes in distributed antenna system (DAS), etc.
  • wireless device or user equipment refers to any type of wireless device communicating with a network node and/or with another wireless device in a cellular or mobile communication system.
  • UE refers to any type of wireless device communicating with a network node and/or with another wireless device in a cellular or mobile communication system.
  • Examples of UE are target device, device to device (D2D) UE, proximity capable UE (aka ProSe UE), machine type UE or UE capable of machine to machine (M2M)
  • D2D device to device
  • ProSe UE proximity capable UE
  • M2M machine to machine
  • Tablet mobile terminals
  • smart phone laptop embedded equipped (LEE)
  • USB dongles etc.
  • Embodiments are applicable to any RAT or multi-RAT systems, where the wireless device receives and/or transmit signals (e.g. data) e.g. New Radio (NR), Wi-Fi, Long Term Evolution (LTE), LTE-Advanced, Wideband Code Division Multiple Access (WCDMA), Global System for Mobile communications/enhanced Data rate for GSM Evolution
  • signals e.g. data
  • NR New Radio
  • Wi-Fi Wireless Fidelity
  • LTE Long Term Evolution
  • LTE-Advanced Long Term Evolution-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • GSM/EDGE Global System for Mobile communications
  • WiMax Worldwide Interoperability for Microwave Access
  • UMB Ultra Mobile Broadband
  • functions means or units may be implemented using digital logic and/or one or more microcontrollers, microprocessors, or other digital hardware. In some embodiments, several or all of the various functions may be implemented together, such as in a single application-specific integrated circuit (ASIC), or in two or more separate devices with appropriate hardware and/or software interfaces between them.
  • ASIC application-specific integrated circuit
  • processors or“controller” as used herein does not exclusively refer to hardware capable of executing software and may implicitly include, without limitation, digital signal processor (DSP) hardware and/or program or application data. Other hardware, conventional and/or custom, may also be included. Designers of communications devices will appreciate the cost, performance, and maintenance trade-offs inherent in these design choices.
  • DSP digital signal processor
  • a communication system includes a telecommunication network 3210, such as a 3GPP-type cellular network, which comprises an access network 321 1 , such as a radio access network, and a core network 3214.
  • the access network 321 1 comprises a plurality of base stations 3212a, 3212b, 3212c, such as NBs, eNBs, gNBs or other types of wireless access points being examples of the radio network node 12 herein, each defining a corresponding coverage area 3213a, 3213b, 3213c.
  • Each base station 3212a, 3212b, 3212c is connectable to the core network 3214 over a wired or wireless connection 3215.
  • a first user equipment (UE) 3291 being an example of the wireless device 10, located in coverage area 3213c is configured to wirelessly connect to, or be paged by, the corresponding base station 3212c.
  • a second UE 3292 in coverage area 3213a is wirelessly connectable to the corresponding base station 3212a. While a plurality of UEs 3291 , 3292 are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole UE is in the coverage area or where a sole UE is connecting to the corresponding base station 3212.
  • the telecommunication network 3210 is itself connected to a host computer 3230, which may be embodied in the hardware and/or software of a standalone server, a cloud-implemented server, a distributed server or as processing resources in a server farm.
  • the host computer 3230 may be under the ownership or control of a service provider, or may be operated by the service provider or on behalf of the service provider.
  • the connections 3221 , 3222 between the telecommunication network 3210 and the host computer 3230 may extend directly from the core network 3214 to the host computer 3230 or may go via an optional intermediate network 3220.
  • the intermediate network 3220 may be one of, or a combination of more than one of, a public, private or hosted network; the intermediate network 3220, if any, may be a backbone network or the Internet; in particular, the intermediate network 3220 may comprise two or more sub-networks (not shown).
  • the communication system of Figure 7 as a whole enables connectivity between one of the connected UEs 3291 , 3292 and the host computer 3230.
  • the connectivity may be described as an over-the-top (OTT) connection 3250.
  • the host computer 3230 and the connected UEs 3291 , 3292 are configured to communicate data and/or signaling via the OTT connection 3250, using the access network 321 1 , the core network 3214, any intermediate network 3220 and possible further infrastructure (not shown) as intermediaries.
  • the OTT connection 3250 may be transparent in the sense that the participating communication devices through which the OTT connection 3250 passes are unaware of routing of uplink and downlink communications.
  • a base station 3212 may not or need not be informed about the past routing of an incoming downlink communication with data originating from a host computer 3230 to be forwarded (e.g., handed over) to a connected UE 3291. Similarly, the base station 3212 need not be aware of the future routing of an outgoing uplink
  • a host computer 3310 comprises hardware 3315 including a communication interface 3316 configured to set up and maintain a wired or wireless connection with an interface of a different communication device of the communication system 3300.
  • the host computer 3310 further comprises processing circuitry 3318, which may have storage and/or processing capabilities.
  • the processing circuitry 3318 may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • the host computer 3310 further comprises software 331 1 , which is stored in or accessible by the host computer 3310 and executable by the processing circuitry 3318.
  • the software 331 1 includes a host application 3312.
  • the host application 3312 may be operable to provide a service to a remote user, such as a UE 3330 connecting via an OTT connection 3350 terminating at the UE 3330 and the host computer 3310. In providing the service to the remote user, the host application 3312 may provide user data which is transmitted using the OTT connection 3350.
  • the communication system 3300 further includes a base station 3320 provided in a telecommunication system and comprising hardware 3325 enabling it to communicate with the host computer 3310 and with the UE 3330.
  • the hardware 3325 may include a communication interface 3326 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of the communication system 3300, as well as a radio interface 3327 for setting up and maintaining at least a wireless connection 3370 with a UE 3330 located in a coverage area (not shown in Fig.8) served by the base station 3320.
  • the communication interface 3326 may be configured to facilitate a connection 3360 to the host computer 3310.
  • connection 3360 may be direct or it may pass through a core network (not shown in Fig.8) of the telecommunication system and/or through one or more intermediate networks outside the telecommunication system.
  • the hardware 3325 of the base station 3320 further includes processing circuitry 3328, which may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • the base station 3320 further has software 3321 stored internally or accessible via an external connection.
  • the communication system 3300 further includes the UE 3330 already referred to.
  • Its hardware 3335 may include a radio interface 3337 configured to set up and maintain a wireless connection 3370 with a base station serving a coverage area in which the UE 3330 is currently located.
  • the hardware 3335 of the UE 3330 further includes processing circuitry 3338, which may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • the UE 3330 further comprises software 3331 , which is stored in or accessible by the UE 3330 and executable by the processing circuitry 3338.
  • the software 3331 includes a client application 3332.
  • the client application 3332 may be operable to provide a service to a human or non-human user via the UE 3330, with the support of the host computer 3310.
  • an executing host application 3312 may be operable to provide a service to a human or non-human user via the UE 3330, with the support
  • the client application 3332 may receive request data from the host application 3312 and provide user data in response to the request data.
  • the OTT connection 3350 may transfer both the request data and the user data.
  • the client application 3332 may interact with the user to generate the user data that it provides.
  • the host computer 3310, base station 3320 and UE 3330 illustrated in Fig.8 may be identical to the host computer 3230, one of the base stations 3212a, 3212b, 3212c and one of the UEs 3291 , 3292 of Fig. 7, respectively.
  • the inner workings of these entities may be as shown in Fig. 8 and independently, the surrounding network topology may be that of Fig. 7.
  • the OTT connection 3350 has been drawn abstractly to illustrate the communication between the host computer 3310 and the user equipment 3330 via the base station 3320, without explicit reference to any intermediary devices and the precise routing of messages via these devices.
  • Network infrastructure may determine the routing, which it may be configured to hide from the UE 3330 or from the service provider operating the host computer 3310, or both. While the OTT connection 3350 is active, the network infrastructure may further take decisions by which it dynamically changes the routing (e.g., on the basis of load balancing consideration or
  • the wireless connection 3370 between the UE 3330 and the base station 3320 is in accordance with the teachings of the embodiments described throughout this disclosure.
  • One or more of the various embodiments improve the performance of OTT services provided to the UE 3330 using the OTT connection 3350, in which the wireless connection 3370 forms the last segment. More precisely, the teachings of these embodiments may improve usage of resources since the mitigation scheme is used based on the load in a neighbouring radio network node resulting in an efficient use of resource with improved performance and that may affect the latency and thereby provide benefits such as reduced user waiting time, and better responsiveness.
  • a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve.
  • the measurement procedure and/or the network functionality for reconfiguring the OTT connection 3350 may be implemented in the software 331 1 of the host computer 3310 or in the software 3331 of the UE 3330, or both.
  • sensors may be deployed in or in association with communication devices through which the OTT connection 3350 passes; the sensors may participate in the measurement procedure by supplying values of the monitored quantities exemplified above, or supplying values of other physical quantities from which software 331 1 , 3331 may compute or estimate the monitored quantities.
  • the reconfiguring of the OTT connection 3350 may include message format, retransmission settings, preferred routing etc.; the reconfiguring need not affect the base station 3320, and it may be unknown or imperceptible to the base station 3320. Such procedures and functionalities may be known and practiced in the art.
  • measurements may involve proprietary UE signaling facilitating the host computer’s 3310 measurements of throughput, propagation times, latency and the like.
  • the measurements may be implemented in that the software 331 1 , 3331 causes messages to be transmitted, in particular empty or‘dummy’ messages, using the OTT connection 3350 while it monitors propagation times, errors etc.
  • Fig. 9 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station and a UE which may be those described with reference to Figures 7 and 8. For simplicity of the present disclosure, only drawing references to Figure 9 will be included in this section.
  • the host computer provides user data.
  • the host computer provides the user data by executing a host application.
  • the host computer initiates a transmission carrying the user data to the UE.
  • the base station transmits to the UE the user data which was carried in the transmission that the host computer initiated, in accordance with the teachings of the embodiments described throughout this disclosure.
  • the UE executes a client application associated with the host application executed by the host computer.
  • Fig. 10 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station and a UE which may be those described with reference to Figures 7 and 8. For simplicity of the present disclosure, only drawing references to Figure 10 will be included in this section.
  • the host computer provides user data.
  • the host computer provides the user data by executing a host application.
  • the host computer initiates a transmission carrying the user data to the UE. The transmission may pass via the base station, in accordance with the teachings of the embodiments described throughout this disclosure.
  • the UE receives the user data carried in the transmission.
  • Fig. 11 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station and a UE which may be those described with reference to Figures 7 and 8. For simplicity of the present disclosure, only drawing references to Figure 1 1 will be included in this section.
  • the UE receives input data provided by the host computer.
  • the UE provides user data.
  • the UE provides the user data by executing a client application.
  • the UE executes a client application which provides the user data in reaction to the received input data provided by the host computer.
  • the executed client application may further consider user input received from the user.
  • the UE initiates, in an optional third substep 3630, transmission of the user data to the host computer.
  • the host computer receives the user data transmitted from the UE, in accordance with the teachings of the embodiments described throughout this disclosure.
  • Fig. 12 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station and a UE which may be those described with reference to Figures 7 and 8. For simplicity of the present disclosure, only drawing references to Figure 12 will be included in this section.
  • the base station receives user data from the UE.
  • the base station initiates transmission of the received user data to the host computer.
  • the host computer receives the user data carried in the transmission initiated by the base station.
  • V2x Vehicle-to-anything-you-can-imagine

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Abstract

Les modes de réalisation ici concernent par exemple un procédé réalisé par un premier nœud de réseau radio (12) permettant de gérer la transmission de données dans un réseau de communication sans fil. Le premier noeud de réseau radio (12) détermine une première charge du premier noeud de réseau radio (12), et obtient une indication d'une seconde charge d'un second noeud de réseau radio (13). Le premier noeud de réseau radio sélectionne en outre un ou plusieurs paramètres de transmission pour un ou plusieurs faisceaux sur la base de la première charge déterminée et de l'indication obtenue de la seconde charge. Le premier noeud de réseau radio effectue en outre une transmission de données à un dispositif sans fil (10) à l'aide d'un ou plusieurs paramètres de transmission sélectionnés et d'un ou plusieurs faisceaux.
EP19920976.8A 2019-03-22 2019-03-22 Noeud de réseau radio et procédé réalisé dans celui-ci permettant de gérer une transmission dans un réseau de communication sans fil Withdrawn EP3942706A1 (fr)

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WO2018070911A1 (fr) * 2016-10-13 2018-04-19 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif sans fil, nœud de réseau et procédés intégrés pour optimiser une radiomessagerie dans un réseau de communications

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EP2856794A4 (fr) * 2012-06-04 2016-02-10 Eden Rock Communications Llc Procédé et système d'équilibrage de charge de réseau cellulaire
CN107005294B (zh) * 2014-10-02 2021-03-30 诺基亚通信公司 时域和/或频域协调调度和波束成形
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KR102648505B1 (ko) * 2017-02-24 2024-03-18 삼성전자주식회사 무선 통신 시스템에서 부하 분산을 위한 장치 및 방법
KR102362888B1 (ko) * 2017-09-01 2022-02-14 주식회사 케이티 셀간 간섭 제어를 위한 빔 전송 전력 조정 시스템 및 방법

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