WO2022265547A1 - Nœud de réseau et procédé pour limiter des préambules erronés - Google Patents

Nœud de réseau et procédé pour limiter des préambules erronés Download PDF

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Publication number
WO2022265547A1
WO2022265547A1 PCT/SE2021/050604 SE2021050604W WO2022265547A1 WO 2022265547 A1 WO2022265547 A1 WO 2022265547A1 SE 2021050604 W SE2021050604 W SE 2021050604W WO 2022265547 A1 WO2022265547 A1 WO 2022265547A1
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Prior art keywords
detections
preamble
trp
trps
network node
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PCT/SE2021/050604
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English (en)
Inventor
Yang Zhang
Yufeng Zhao
Magnus FINNE
Weidong Kong
Lars O MÅRTENSSON
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Telefonaktiebolaget Lm Ericsson (Publ)
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Priority to PCT/SE2021/050604 priority Critical patent/WO2022265547A1/fr
Publication of WO2022265547A1 publication Critical patent/WO2022265547A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • Embodiments herein relate to a network node and a method therein. In some aspects, they relate to restraining Random Access (RA) false preamble detections in an RA procedure from a User Equipment (UE) to a first Transmission and Reception Point, (TRP) in a multi-TRP cell of a wireless communications network.
  • RA Random Access
  • UE User Equipment
  • TRP Transmission and Reception Point
  • wireless devices also known as wireless communication devices, mobile stations, stations (STA) and/or User Equipments (UE), communicate via a Wide Area Network or a Local Area Network such as a W-Fi network or a cellular network comprising a Radio Access Network (RAN) part and a Core Network (CN) part.
  • RAN Radio Access Network
  • CN Core Network
  • the RAN covers a geographical area which is divided into service areas or cell areas, which may also be referred to as a beam or a beam group, with each service area or cell area being served by a radio network node such as a radio access node e.g., a W-Fi access point or a radio base station (RBS), which in some networks may also be denoted, for example, a NodeB, eNodeB (eNB), or gNB as denoted in Fifth Generation (5G) telecommunications.
  • a service area or cell area is a geographical area where radio coverage is provided by the radio network node.
  • the radio network node communicates over an air interface operating on radio frequencies with the wireless device within range of the radio network node.
  • 3GPP is the standardization body for specify the standards for the cellular system evolution, e.g., including 3G, 4G, 5G and the future evolutions.
  • EPS Evolved Packet System
  • 4G Fourth Generation
  • 3GPP 3rd Generation Partnership Project
  • 5G New Radio 5G New Radio
  • Frequency bands for 5G NR are being separated into two different frequency ranges, Frequency Range 1 (FR1) and Frequency Range 2 (FR2).
  • FR1 comprises sub-6 GHz frequency bands. Some of these bands are bands traditionally used by legacy standards but have been extended to cover potential new spectrum offerings from 410 MHz to 7125 MHz
  • FR2 comprises frequency bands from 24.25 GHz to 52.6 GHz. Bands in this millimetre wave range have shorter range but higher available bandwidth than bands in the FR1.
  • Multi-antenna techniques may significantly increase the data rates and reliability of a wireless communication system.
  • a wireless connection between a single user, such as UE, and a base station the performance is in particular improved if both the transmitter and the receiver are equipped with multiple antennas, which results in a Multiple-Input Multiple-Output (MIMO) communication channel.
  • MIMO Multiple-Input Multiple-Output
  • SU Single-User
  • MIMO enables the users to communicate with the base station simultaneously using the same time-frequency resources by spatially separating the users, which increases further the cell capacity.
  • MU-MIMO Multi-User
  • MU-MIMO may benefit when each UE only has one antenna.
  • Such systems and/or related techniques are commonly referred to as MIMO.
  • a Random Access (RA) procedure means a sequence of messages, starting with a preamble, between a UE and a base station, also referred to as network node herein, in a Radio Access Network (RAN) in order for the UE to acquire Uplink (UL) synchronization and obtain a specified ID for an upcoming radio access communication.
  • RAN Radio Access Network
  • PRACH detector Physical Random Access Channel (PRACH) preambles in NR are generated from Zadoff-Chu sequences, as described in 3GPP TS 38.211 v15.6.0, “Physical channels and modulation”.
  • a preamble consists of one or more periods of the Zadoff-Chu sequence plus a cyclic prefix.
  • a typical PRACH detector is described in 3GPP Tdoc R1-1702127, Ericsson, “NR PRACH design”, February 2017.
  • a bandpass filter is followed by a bank of correlators for the configured preamble sequences in the cell.
  • the correlator output for different periods, if more than one period, of the periodic preamble may be combined either coherently or non-coherently.
  • the complex correlator output from the different periods is summed.
  • the power, i.e. the amplitude squared, of the correlator output is summed.
  • the correlator outputs from different receive antennas are added non-coherently.
  • a preamble is detected if the power scaled by the estimated noise power for any sample within the possible range of delays in the combined signal exceeds a threshold.
  • the sample with the highest power also gives the estimated time-of-arrival that ideally equals the round-trip time.
  • the Zadoff-Chu sequences have ideal periodic autocorrelation properties that make it possible to estimate the time-of-arrival with high accuracy as long as the delay of the signal is within the period of the preamble.
  • a cyclic shift may be applied over the base root sequence.
  • the value of the cyclic shifts of the root sequences, i.e. , base sequences, may be represented by a ZeroCorrelationZoneConfig (Ncs) parameter.
  • the Ncs value determines the maximum delay that base station can detect and therefore also impacts cell range.
  • the 5G system is generally a multi-beam based system.
  • one cell can have one or more transmission/reception points (TRPs).
  • TRPs may be co-sited or spread in a cell’s coverage area.
  • the most common deployment is single-TRP cells, where the cell has one sector carrier that represents the resources of the TRP in a cell.
  • Changing the serving cell requires a Radio Resource Configuration (RRC) reconfiguration of the resources, which generates a transmission gap, approximately -60-100ms, and if addressing the primary cell of the connection it introduces a retainability risk.
  • RRC Radio Resource Configuration
  • a multi-TRP cell when UE moves between the TRPs, it is possible to switch the serving TRP of UE without need of RRC signalling. This because the mobility performed between the TRPs can be handled internally in the cell by lower layers, e.g. MAC layer, or it can be seamless. Combining multiple TRPs into one cell can also simplify the configuration and deployment of a radio network.
  • TRP reselection in a free, seamless and fast way to utilize the TRPs in the network without always requiring Layer 3, e.g. RRC layer, signalling. It is even more important in 5G due to the introduction of new low latency demanding services and the introduction of the RAN higher layer split, i.e. Distributed Unit (DU)/Central Unit (CU), where the RRC control may be more centralized deployed, i.e. with increased delay.
  • DU Distributed Unit
  • CU Central Unit
  • a dynamic and smooth multiple-TRP solution would work as a catalysator to enable several different network benefits.
  • DPS Dynamic Point Switching
  • SFN Single Frequency Network
  • An object of embodiments herein is to improve the performance of wireless communication in multi-TRP cells.
  • the object is achieved by a method performed by a network node for restraining Random Access (RA) false preamble detections in an RA procedure from a UE, to a first TRP, in a multi-TRP cell of a wireless communications network.
  • RA Random Access
  • Each TRP out of a set of TRPs has detected one or more respective preambles.
  • the network node obtains for each preamble detected by a TRP out of the set of TRPs, a respective detection.
  • the respective detection comprises a preamble Identity, ID, a signal value, which signal value is related to a signal strength of the received preamble, and a TRP ID associated with the respective TRP detecting the preamble.
  • the network node aggregates the obtained detections into a set of detections.
  • the network node identifies from the set of detections, one or more detections comprising duplicate preamble IDs. For each of the one or more detections comprising duplicate preamble IDs, the network node reduces the set of detections, by removing the duplicate detection with the signal value related to the lowest signal strength.
  • the network node further reduces the set of detections, by removing one or more detections identified as potential false detections based on one or more out of:
  • the network node identifies one or more candidates to be the first TRP, based on the further reduced set of detections.
  • the object is achieved by a network node configured to restrain RA false preamble detections in an RA procedure from a UE to a first TRP in a multi-TRP cell of a wireless communications network.
  • Each TRP out of a set of TRPs is arranged to have detected one or more respective preambles.
  • the network node further being configured to: obtain for each preamble detected by a TRP out of the set of TRPs, a respective detection comprising a preamble Identity, ID, a signal value, which signal value is adapted to be related to a signal strength of the received preamble, and a TRP ID associated with the respective TRP detecting the preamble, aggregate the obtained detections into a set of detections, identify from the set of detections, one or more detections comprising duplicate preamble IDs, for each of the one or more detections comprising duplicate preamble IDs, reduce the set of detections, by removing the duplicate detection with the signal value related to the lowest signal strength, further reduce the set of detections, by removing one or more detections identified as potential false detections based on one or more out of:
  • Figure 1 is a schematic block diagram illustrating prior art.
  • Figure 2a-d are schematic block diagrams illustrating prior art.
  • Figure 3a-d are schematic block diagrams illustrating prior art.
  • Figure 4 is a schematic block diagram illustrating embodiments of a wireless communications network.
  • Figure 5 is a flowchart depicting an embodiment of a method in a network node
  • Figure 6 is a schematic block diagram illustrating embodiments herein
  • Figure 7a-b are schematic block diagrams illustrating embodiments of a network node.
  • Figure 8 schematically illustrates a telecommunication network connected via an intermediate network to a host computer.
  • Figure 9 is a generalized block diagram of a host computer communicating via a base station with a user equipment over a partially wireless connection
  • Figures 10-13 are flowcharts illustrating methods implemented in a communication system including a host computer, a base station and a user equipment.
  • SSB Index By allocating different Synchronization Signal Block (SSB) Index (ID)s to different TRPs, it is possible to have a TRP specific PRACH preamble resource.
  • SSBIDs since the number of SSBIDs is very limited, it cannot always work. E.g., below 3GHz, max 4 SSBIDs cannot manage e.g. 6 TRPs in a cell. Even if it may work in some cases, such TRP specific PRACH resource configuration will need to be planned together with beam management resources, therefore beam related functionality will be limited.
  • a UE timing is assumed to synchronize (sync) to a TRP nearby, e.g. TRP1 in Figure 1.
  • TRP2 that is the TRP most distant from UE, will experience a PRACH delay of t1+t2, if all TRPs are well synchronized.
  • the delay of t1+t2 is since normally a UE synchronizes to the strongest Downlink (DL) signal which is in this case TRP1 i.e. , DL delay is t1. While in UL the UE signal arrival time at different TRPs are different, the longest UL delay happened to TRP2 which is t2.
  • TA Timing Advance
  • Ncs10 i.e. more than one preamble is created from one root sequence, which is a common case for not very big cells, (Ncs/L)/df>t1+t2 should be satisfied.
  • t1 is DL propagation delay between the TRP1 and the UE
  • t2 is UL propagation delay between the UE and the TRP2, UE sync error is ignored here. Otherwise, false detection may occur. This is since an RA preamble will be wrongly detected as another preamble ID by the TRP2.
  • Ncs is zero zone configuration per 3GPP chapter 6.3.3 in 38.211 , L is preamble sequence length, df is PRACH signal’s subcarrier spacing i.e. 1/df corresponds PRACH symbol length.
  • the false detection can be mitigated by applying a bigger Ncs value which corresponds a bigger cell range, the dashed circle in Figure 1 , however such Ncs increase is undesired if PRACH short format is used, because more root sequences are then needed for such multi-TRP (mTRP) cells while sequence planning is already very difficult due to the limited number of root sequences.
  • mTRP multi-TRP
  • a short format has to be used for those Time Division Duplex (TDD) patterns that contain only 1 UL slot, e.g. in Korea, long format will occupy minimum 2 Midband slots which is not affordable.
  • TDD Time Division Duplex
  • Ncs is the parameter on how a root sequence should be reused, the original root sequence is cyclic shifted at interval of Ncs so the biggest cell range, e.g. longest tolerable propagation delay, is defined by Ncs zone’s time length. In other words, Ncs is defined as the length of the cyclic shift.
  • Cell range gives minimum Ncs. Smaller Ncs relates to less RA root sequences.
  • Figures 2 a-d illustrates 5 TRPs forming a square with minimum Inter-Site Distance (ISD) of 500m in four different cell range scenarios, wherein Figure 2a depicts a cell range of 500m, Figure 2b depicts a cell range of 1000m, Figure 2c depicts a cell range of 1500m, and Figure 2d depicts a cell range of 2000m.
  • ISD Inter-Site Distance
  • Ncs may solve the false detection problem. For example, with a cell range of 1000m ( Figure 2b), there can still be some false detections, at the x:s, e.g. at -1000m and 1000m, these may be removed if a TA check can be performed properly. Note that doubled Ncs normally means that the number of required root sequences is also doubled.
  • TRPs are located on a straight line at 500 meters spacing in four different cell range scenarios, wherein Figure 3a depicts a cell range of 500m, Figure 3b depicts a cell range of 1000m, Figure 3c depicts a cell range of 1500m, and Figure 3d depicts a cell range of 2000m. Based on the same assumptions as above, that a UE always synchronizes to the closest TRP, i.e.
  • N cs may mitigate the false detection issue. However, it may also result in an undesirable larger coverage area, or many more root sequences may be needed, roughly proportional to the N cs increase, for a multi-TRP cell.
  • the cell range, or N cs increase method may be acceptable, since root sequence resource is less limited.
  • the excessive use of root sequences may be undesired unless the method is much simpler that other alternatives.
  • an object of embodiments herein is to improve the performance of wireless communication in multi-TRP cells.
  • Example embodiments herein provides methods for determining false detections by e.g. performing a time-domain check. This may be performed by considering the property of cyclic shift, and/or a propagation delay between a UE and a respective TRP in a set of TRPs. Furthermore, false detections may be determined by considering a signal value strength of a detection in relation to a strongest signal value among all detections of the TRPs in the set of TRPs.
  • FIG 4 is a schematic overview depicting a wireless communications network 100 wherein embodiments herein may be implemented.
  • the wireless communications network 100 comprises one or more RANs and one or more CNs.
  • the wireless communications network 100 may use a number of different technologies, such as Wi-Fi, Long Term Evolution (LTE), LTE-Advanced, 5G, NR, Wdeband Code Division Multiple Access (WCDMA), Global System for Mobile communications/enhanced Data rate for GSM Evolution (GSM/EDGE), Worldwide Interoperability for Microwave Access (WMAX), or Ultra Mobile Broadband (UMB), just to mention a few possible implementations.
  • LTE Long Term Evolution
  • 5G Fifth Generation
  • NR Wireless Term Evolution-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • GSM/EDGE Global System for Mobile communications/enhanced Data rate for GSM Evolution
  • WMAX Worldwide Interoperability for Microwave Access
  • UMB Ultra Mobile Broadband
  • a number of network nodes operate in the wireless communications network 100 such as e.g. a network node 110.
  • the network node 110 provides radio coverage in a multi-TRP cell 115.
  • the radio coverage in the multi-TRP cell 115 may be provided by a set of TRPs 111, 112, 113.
  • the set of TRPs 111, 112, 113 may be any number of multiple TRPs.
  • the set of TRPs may comprise one or more TRPs 111, 112, 113, such as a first TRP 111, a second TRP 112, and a third TRP 113.
  • the set of TRPs may comprise one or more TRPs 111, 112, 113, such as a first TRP 111, a second TRP 112, and a third TRP 113.
  • the 111, 112, 113 may serve a UE 120 using the multi-TRP cell 115 and/or a respective cell 11, 12, 13.
  • the multi-TRP cell 115 may comprise each of the cells 11, 12, and 13, and/or be defined by their coverage area.
  • the network node 110 may control each respective TRP in the set of TRPs 111,
  • each respective TRP may configure how each respective TRP provide radio and/or communicate with any specific UE.
  • the network node 110 may be any of a NG-RAN node, a base station, a radio access network node such as a Wireless Local Area Network (WLAN) access point or an Access Point Station (AP STA), an access controller, a base station, e.g. a radio base station such as a NodeB, an evolved Node B (eNB, eNode B), a gNB, a base transceiver station, a radio remote unit, an Access Point Base Station, a base station router, a transmission arrangement of a radio base station, a stand-alone access point or any other network unit capable of communicating with a wireless device within the service area served by the network node 110.
  • a radio base station e.g. a radio base station such as a NodeB, an evolved Node B (eNB, eNode B), a gNB, a base transceiver station, a radio remote unit, an Access Point Base Station, a base station router, a transmission arrangement of a radio
  • the radio network node 110 may be referred to as a serving radio network node and communicates with a UE 120 with DL transmissions to the UE 120 and UL transmissions from the UE 120 e.g. by means of any one or more out of the TRPs in the set of TRPs 111 , 112, 113.
  • one or more UEs operate, such as e.g. the UE 120.
  • the UE 120 may also be referred to as a wireless device, an loT device, a mobile station, a non-access point (non-AP) STA, a STA, a user equipment and/or a wireless terminals, communicate via one or more Access Networks (AN), e.g. RAN, to one or more Core Networks (CN).
  • AN Access Networks
  • CN Core Networks
  • wireless device or UE, is a non-limiting term which means any terminal, wireless communication terminal, user equipment, 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 communicating within a cell.
  • MTC Machine Type Communication
  • D2D Device to Device
  • Methods herein may be performed by the network node 110.
  • a Distributed Node (DN) and functionality e.g. comprised in a cloud 135 as shown in Figure 4, may be used for performing or partly performing the methods herein.
  • the functionality may be performed or partly performed by one of the TRPs in the set of TRPs 111, 112, 113.
  • Embodiments herein relate to resolving a preamble ambiguity related to RA preambles sent by the UE 120 and detected by a TRP in the set of TRPs 111, 112, 113.
  • the set of TRPs used herein may comprise one or more TRPs in the multi-TRP cell 115 wherein each respective TRP has detected at least one preamble from a UE, e.g. the UE 120.
  • the preamble ambiguity may be resolved by performing an ambiguity check in order to remove false detections, e.g. false detection of RA preambles.
  • the wording false detection when used herein means that a preamble, e.g. which always implies a certain preamble ID, from a UE, e.g. the UE 120, is detected by network node, e.g. the network node 110, but interpreted as a wrong preamble ID. In some embodiments, this may be performed by any one or more out of two following actions:
  • a strongest preamble detection detected by a first TRP in a set of TRPs has a false detection related to at least one neighboring TRP, e.g. another TRP in the set of TRPs.
  • one way of determining the false detection is to determine whether propagation delay differences between a UE and the at least one neighboring TRPs can match a cyclic shift difference between the strongest preamble and the preambles detected at neighbor TRPs. If possible, a false detection may be determined.
  • a preamble detection e.g. by the first TRP, has a signal value related to signal strength, e.g. preamble power or amplitude, which is lower than the signal value of the detected preamble, e.g. by the at least one neighboring TRP, with a strongest signal value by at least a threshold.
  • the preamble is detected to be too weak and may thus be determined to be a false detection.
  • the preambles considered false detections may then be reduced from the detected preambles. This may mean that the false detections may not be considered when performing subsequent RA-related actions.
  • the embodiments herein may improve the performance of wireless communication e.g. related to RA Key Performance Indicators (KPI). Embodiments herein may also mitigate capacity impact due to false detections in multi-TRP deployments. Furthermore, alternatively or additionally, the embodiments herein may improve cell planning and/or cell optimizing related to RA. This is e.g. since it is now not necessary to consider all detections as the false detections may be removed.. A number of embodiments will now be described, some of which may be seen as alternatives, while some may be used in combination.
  • KPI Key Performance Indicators
  • Figure 5 shows example embodiments of a method performed by the network node 110 for restraining RA false preamble detections in an RA procedure from the UE 120 to the first TRP 111 in the multi-TRP cell 115 of the wireless communications network 100.
  • Each TRP out of a set of TRPs 111, 112, 113 has detected one or more respective preambles.
  • the method comprises the following actions, which actions may be taken in any suitable order. Optional actions are referred to as dashed boxes in Figure 5.
  • a preamble may also be referred to as an RA preamble.
  • the network node 110 For each preamble detected by a TRP out of the set of TRPs 111, 112, 113, the network node 110 obtains a respective detection.
  • the respective detection comprises a preamble ID, a signal value, and a TRP ID associated with the respective TRP detecting the preamble.
  • the signal value is related to a signal strength of the received preamble.
  • the signal value may be any one out of: amplitude of the detected preamble, - a value which reflects a relation with the amplitude of the detected preamble, e.g. a linear or a nonlinear relation, the measured Signal to Noise Ratio (SNR) of the detected preamble, the power of the detected preamble, and
  • SNR Signal to Noise Ratio
  • the detected preamble may be obtained by being received from the UE 120, in a message being part of the RA procedure. However, other preambles transmitted from other UEs may also be detected by the set of TRPs 111, 112, 113.
  • the network node 110 aggregates the obtained detections into a set of detections. In this way, it may be easier to compare the detections and to determine the false detections. In some embodiments, this may be an ordered list, e.g. for simpler comparisons of the detections.
  • the network node 110 identifies from the set of detections, one or more detections comprising duplicate preamble IDs.
  • a duplicate detection as used herein may mean any preamble with the same preamble ID detected at least once, e.g. two or more times, by one or more TRPs in the set of TRPs.
  • the network node 110 For each of the one or more detections comprising duplicate preamble IDs, the network node 110 reduces the set of detections. This is performed by removing the duplicate detection with the signal value related to the lowest signal strength. This means that when the network node 110 e.g. has identified two detections having the same preamble ID, one of the two detections is removed.
  • the removed detection is the detection with a signal value related to the lowest signal strength. This detection is removed since preambles with very weak signal strengths are unlikely to be a true detection. Furthermore, the network node 110 may in some cases be limited to only one response per preamble ID, which means there is no need to keep more than one detection with the same preamble ID.
  • all but the preamble with the strongest signal value may be removed.
  • the network node 110 further reduces the set of detections, by removing one or more detections identified as potential false detections based on one or more out of Condition A, and Condition B as follows.
  • Condition A comprises: A propagation delay of the preamble transmitted from the UE 120 to the respective TRPs, and a location of the UE 120. In some embodiments, these may match a cyclic shift difference between the detected preamble IDs of strongest detection and respective TRPs. In other words, this may be, e.g. to consider whether or not a preamble transmitted from a location of the UE, with a certain propagation delay can be identified as a preamble with another preamble ID. The detection may then be a false detection.
  • Condition B comprises: A signal value related to a signal strength in a detection out of the set of detections being lower than the signal value related to the strongest signal strength in the set of detections by at least a threshold value. In other words, this is to remove preambles with very weak signal strengths that cannot be a true detection since false detection of the true preamble at a neighbour TRP may be assumed to experience more pathloss than the strongest detection due to longer propagation distance.
  • the threshold value as used in embodiments herein may also interchangeably be referred to as a threshold.
  • the location of the UE 120 is determined based on the coverage of the TRP serving the UE 120. This may be since the network node 110 knows the coverage of each respective TRP in the set of TRPs 111, 112, 113.
  • the coverage may relate to a cell range, e.g. in meters, also known by the network node 110.
  • the location may thus be related to the serving TRP location, and a range related to the coverage, e.g. cell range of the serving TRP.
  • the TRP serving the UE 120 may be a TRP in the set of TRPs 111, 112, 113.
  • the network node 110 further reduces the set of detections based on a cyclic shift.
  • a detected preamble with a certain cyclic shift may be determined to be a false detection, or at least a potential false detection and may thus be further reduced, e.g. removed, from the set of detections.
  • the cyclic shift of the detected preamble e.g. with respect to a root sequence, may represent the preamble ID.
  • the preamble ID of a detected preamble may be at least two different preamble IDs and thus be ambiguous.
  • the detected preamble may be a false detection.
  • Different possible embodiments of reducing the set of detections based on the cyclic shift will be further explained with respect to Condition A below and with respect to Figure 6.
  • the threshold value is determined based on a respective propagation loss for at least two respective TRPs in the set of TRPs 111, 112, 113. In this way, a more precise threshold may be achieved as it better considers the conditions for radio communication. In some embodiments, this may further include a margin to compensate for fading.
  • the threshold value is determined based on the TRP ID for each respective detection. This may be since each respective TRP in the set of TRPs 111, 112, 113 may be associated with different radio conditions and thus need different thresholds.
  • the different radio conditions may relate to, for the respective TRP in the set of TRPs 111 , 112, 113, any one or more out of: a location of the respective TRP, DL power, antenna positions, beam patterns, beam directions, radio channel multipath and fading characteristics, and propagation loss.
  • the threshold value is determined based on a simulation of preamble detection, which simulation is based on any one or more out of: the positions of the TRPs in the set of TRPs 111 , 112, 113, beam patterns and/or beam directions, antenna positions with relation to their respective TRPs, each respective TRPs Downlink, DL, power, and the location of the UE 120.
  • the network node 110 identifies one or more candidates to be the first TRP 111, based on the further reduced set of detections. In other words, when the false detections are removed from the set of detections, the remaining detections can be used to better determine which detections relates to the first TRP 111, e.g. the closest TRP and/or the TRP intended for the RA.
  • the network node 110 determines, based on the further reduced set of detections, whether or not the respective TRP in the set of TRPs 111, 112, 113 should respond to an RA preamble transmitted by the UE 120.
  • a detected preamble may be a false detection, e.g. does not relate to the correct TRP
  • the detecting TRP should not respond to the preamble as the preamble is directed towards another TRP, e.g. another TRP of the set of TRPs 111, 112, 113 or a TRP not in the multi-TRP cell.
  • Some embodiments herein may relate to a following example scenario for reducing false detections of preambles, e.g. performed by the network node 110.
  • the example scenario is defined by actions 601-603 below (not shown).
  • Action 601
  • All detected preambles from all TRPs in the set of TRPs 111, 112, 113, are aggregated. They may e.g. be aggregated into a list that may be referred to as a set of detections.
  • All detected preambles e.g. comprises preamble IDs, signal values, e.g. represented by amplitudes, and TRP IDs, e.g. identifying which TRP that detected this preamble.
  • This action may relate to action 501 and/or action 502 above.
  • One of the two detected preambles comprising the duplicated preamble IDs are then removed. This may be performed by keeping the preamble ID associated with the preamble having the strongest signal value, e.g. highest power and/or amplitude.
  • the detections, e.g. in the set of detections may then be sorted according to their preamble amplitude, e.g. high to low, and the output detections, e.g. the set of detections, become:
  • Action 603 may relate to action 503 and/or action 504 above.
  • Action 603 may relate to action 503 and/or action 504 above.
  • Remove one or more detections e.g. the set of detections, if Condition A and Condition B is satisfied, or if Condition A or Condition B is satisfied. This is to say if any one or both of Condition A and Condition B is satisfied, remove a detection.
  • Condition A and Condition B as used herein may comprise any one or more of the features described below and/or above with regards to Action 505.
  • a friend preamble ID when used herein means a preamble ID that corresponds to the same preamble signal from a UE. All preamble IDs detected by TRPs, which may correspond the same preamble signal are referred to as friend preamble IDs, which e.g. may comprise different signal strengths, e.g. be different with regards to amplitude.
  • propagation delay and cyclic shift patterns may already be known by the network node 110.
  • a coarse location of the UE transmitting the preamble e.g. the UE 120, is known, e.g. by deducing the location based on the location of the TRP that has the strongest preamble detection, e.g. a serving TRP, and timing advance information along with that detection.
  • each TRP e.g. in the set of TRPs 111, 112, 113, may also be known.
  • a Zero Correlation Zone Configuration (ZeroCorrelationZoneConfig) parameter, Ncs may be known, which e.g. represents a root sequence.
  • the known parameters may be preconfigured or previously obtained by the network node 110 according to any suitable method.
  • a root sequence may generate multiple preambles by cyclic shifting. It is thus possible that a preamble transmitted from a UE, e.g. the UE 120, may be detected as a preamble comprising a different preamble ID by different TRPs, e.g. if the different TRPs have different locations.
  • a preamble transmitted by the UE 120 is detected by a TRP4.
  • the preamble may be transmitted using the same serving TRP1, and may be detected as either having a preamble ID 5 or a preamble ID 6. This is since the signal will be detected with a different cyclic shift, e.g. due to different distance of the transmission of the preamble, even though they are within the same cell range of the TRP1.
  • the preamble ID is thus detected as ambiguous, and a false detection may thus be possible.
  • TRP1, TRP2, TRP3, TRP4, TRP5, and TRP6 illustrated in Figure 6 may each be any suitable TRP, e.g. a respective TRP in the set of TRPs 111, 112, 113, e.g. such as the first TRP 111.
  • a preamble with preamble IDO transmitted from the UE 120, within the TRP1 coverage may be interpreted by the TRP4 as either a preamble with preamble ID5 or preamble ID6.
  • the TRP1 coverage may be defined by the inner ring, cell range 1 (cr1) of TRP1, e.g. with a cell range of 400 meters.
  • the misinterpretation of the preamble IDs thus depends on the uncertainty of the UE location, e.g. illustrated in Figure 6 by the UE 120 being in either edge of the coverage of the TRP1. This means that if there is a strong detection of preamble IDO at TRP1, a detection of preamble ID1, ID2, ID3, and/or ID4 at TRP4 may be determined to not be a false detection of the same preamble transmission, regardless of its received amplitude. It may instead be determined that the preamble is transmitted from another UE. Furthermore, if a cell range of the TRP1 would increase, e.g.
  • cell range 2 (cr2) around the TRP1
  • the uncertainty of the location of the UE 120 would be even larger and thus, this information reduction of the UE 120 would decrease the opportunity in removing potential false detections.
  • a preamble e.g., the preamble with preamble IDO, e.g., detected by the TRP1.
  • a small TA may mean that a UE, e.g. UE 120, is close to the TRP1 and thus it may only be needed to only remove one preamble, e.g. with a preamble ID6, TRP4 detections.
  • Condition A e.g. the removal of friend preambles may be summarized below wherein the network node 110 performs any one or more out of:
  • the TA should be the TA of the strongest detection in the detection list.
  • Calculate distances between the UE 120 and TRPs e.g. in the set of TRPs 111, 112, 113, and/or also propagation delays. Calculating the distances may comprise or implicitly mean to calculate the propagation delays.
  • a preamble id 0 may result in any other detection in the list, e.g., the set of detections. This may mean to go through all detections, e.g.
  • a signal value is low, e.g. a power or amplitude associated with the preamble is low, e.g. lower than the strongest preamble in the set of detection by a threshold value, (p 0 - threshold ), they may be removed from the set of detections. This is since the preambles with these signal values are too weak to be a true detection, e.g. considering pathloss and propagation distance, and is thus considered a potential false detection.
  • a too low threshold value may risk removing too many potentially true detections, and a too high threshold may risk removing few or no false detections at all. Hence, in these embodiments, it is necessary to define the threshold value carefully.
  • the threshold may be obtained from a calculation being performed at any suitable time, e.g. by the network node 110, which both are explained below.
  • the propagation delay is larger than a cyclic shift difference between the TRP1 and the TRP2, e.g. assuming that a cell range is calculated directly from cyclic shift configuration Ncs.
  • An increase of cell range to cr2 e.g. 600m and would tolerate a maximum of 1200m round trip may avoid such a false detection since the TRP2 may then detect the same preamble ID with a larger TA.
  • the detection may then be automatically ignored in subsequent preamble selection, e.g. by assuming that a preamble has a lower signal value, e.g. amplitude and/or power, at TRP2 which is the common case.
  • a benefit of cell range increase is that false detections will not happen in close TRPs, e.g. between TRP1 and TRP2. In this way, false detection may only happen between far away TRPs therefore setting a threshold may reduce complexity. In some cases, if fading and propagation uncertainty is large, e.g. when using small cell ranges, may make it difficult to calculate an optimal threshold value.
  • the threshold may be calculated as, or based on:
  • PL t and PL 3 are respective propagation losses from the UE 120 to the TRP1 and the TRP3, respectively.
  • the delta, D is a margin to compensate for fading, which may e.g. be calculated or determined by a preconfigured value.
  • the UE 120 may be anywhere close to TRP1, e.g. within the cr1 and/or cr2, in one embodiment herein, it is assumed that the UE 120 is in between TRP1 and TRP2, e.g. the right UE placement location illustrated in Figure 6. In this way, the threshold value can be calculated, e.g. pre-calculated, from a pathloss model.
  • the pathloss model used herein may be any suitable pathloss model, e.g. the Okumura hata model.
  • the TRP1 may be the serving TRP.
  • the serving TRP may change when the UE 120 move, e.g. to the TRP3.
  • the threshold calculation may be carried out by assuming different serving TRPs, e.g. when UE 120 is close to TRP3, the threshold is calculated by or based on PL 5 - PL 3 + A and PL t - PL 3 + A.
  • a minimum value out all thresholds is applied.
  • the threshold may be calculated as a minimum threshold value out of all possible scenarios.
  • a simulation may be carried out to obtain the threshold.
  • the threshold may be TRP specific, e.g. a different threshold for each different TRPJD.
  • An initial value for the threshold value can be set by the simulation.
  • the simulation may comprise any one or more of the following setup and steps:
  • the simulation may first be initialized to collect and/or extract any one or more out of: TRP geographical locations, TRPs’ antenna and/or beam pattern/directions in DL and UL, TRPs’ antenna heights, TRPs’ DL power, propagation environment, e.g. terrain and/or geographical properties, and a max UE power, e.g. of the UE 120.
  • TRP locations e.g. TRPs in the set of TRPs 111, 112, 113.
  • TRP locations, TRP antenna/beam patterns of TRPs, UE height, UE locations, UE antenna properties may be used together with the propagation environment. Such propagation loss calculations may be performed by any suitable method.
  • the UE 120 For each possible UE location point within a potential cell coverage, e.g. cr1, cr2, calculate received preamble powers and propagation delays at each TRP.
  • the UE 120 is assumed to be time synced to the TRP, e.g. in the set of TRPs 111, 112, 113, with the lowest pathloss.
  • the UE 120 UL Tx power may be set to a value such that after propagation, a transmitted preamble may arrive at the TRP that the UE 120 has synced with at a predefined level e.g. -110dBm.
  • Such power control may be based on the synced TRP DL power and max UE 120 power into account.
  • the calculation on propagation delay and Time of Arrival (TOA) at TRPs may be based on a distance between the UE 120 and antennas of each respective TRP in the set of TRPs 111, 112, 113.
  • TOA Time of Arrival
  • the preamble detections which has a longer delay than a Ncs range may be identified, e.g. determined as a potential false detection.
  • the power differences between a correct, e.g. true, detection and false detections may be determined, and e.g. recorded. This classification of false and true detection may then be used to determine the false detections, e.g. in the set of detections.
  • a threshold value may then be set accordingly. In some embodiments, this is exemplified by a Cumulative Distribution Function(CDF) based threshold, which can be set to e.g. the 5th percentile of a CDF curve.
  • CDF Cumulative Distribution Function
  • the network node 110 is configured to restrain RA false preamble detections in an RA procedure from the UE 120 to the first TRP 111 in the multi-TRP cell 115 of the wireless communications network 100.
  • Each TRP out of the set of TRPs 111 , 112, 113 is arranged to have detected one or more respective preambles.
  • the network node 110 may comprise an arrangement depicted in Figures 7a and 7b.
  • the network node 110 may comprise an input and output interface 700 configured to communicate with the UE 120, e.g. via one or more TRPs, e.g. the first TRP 111 and/or the set of TRPs 111, 112, 113.
  • the input and output interface 700 may comprise a wireless receiver (not shown) and a wireless transmitter (not shown).
  • the network node 110 may further be configured to, e.g.
  • obtaining unit 710 in the network node 110 obtain for each preamble detected by a TRP out of the set of TRPs 111, 112, 113, a respective detection comprising a preamble Identity, ID, a signal value, which signal value is adapted to be related to a signal strength of the received preamble, and a TRP ID associated with the respective TRP detecting the preamble.
  • the network node 110 may further be configured to, e.g. by means of an aggregating unit 720 in the network node 110, aggregate the obtained detections into a set of detections.
  • the network node 110 may further be configured to, e.g. by means of an identifying unit 740 in the network node 110, identify from the set of detections, one or more detections comprising duplicate preamble IDs.
  • the network node 110 may further be configured to, e.g. by means of a reducing unit 730 in the network node 110, for each of the one or more detections comprising duplicate preamble IDs, reduce the set of detections, by removing the duplicate detection with the signal value related to the lowest signal strength.
  • the network node 110 may further be configured to, e.g. by means of the reducing unit 730 in the network node 110, further reduce the set of detections, by removing one or more detections identified as potential false detections based on one or more out of:
  • the network node 110 may further be configured to, e.g. by means of the reducing unit 730 in the network node 110, further reduce the set of detections is based on a cyclic shift.
  • the network node 110 may further be configured to, e.g. by means of the identifying unit 740 in the network node 110, identify one or more candidates to be the first TRP 111, based on the further reduced set of detections.
  • the network node 110 may further be configured to, e.g. by means of a determining unit 750 in the network node 110, based on the further reduced set of detections, determine whether or not the respective TRP in the set of TRPs 111, 112, 113 should respond to an RA preamble transmitted by the UE 120.
  • the location of the UE 120 is determined based on the coverage of the TRP serving the UE 120.
  • the threshold value is determined based on a respective propagation loss for at least two respective TRPs in the set of TRPs 111, 112, 113. In some embodiments, the threshold value is determined based on the TRP ID for each respective detection.
  • the threshold value is determined based on a simulation of preamble detection, which simulation is adapted to be based on any one or more out of: the positions of the TRPs in the set of TRPs 111 , 112, 113, beam patterns and/or beam directions, antenna positions with relation to their respective TRPs, each respective TRPs DL power, and the location of the UE 120.
  • the embodiments herein may be implemented through a respective processor or one or more processors, such as the processor 760 of a processing circuitry in the network node 110 depicted in Figure 7a, together with respective computer program code for performing the functions and actions of the embodiments herein.
  • the program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the embodiments herein when being loaded into the network node 110.
  • One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick.
  • the computer program code may furthermore be provided as pure program code on a server and downloaded to the network node 110.
  • the network node 110 may further comprise a memory 770 comprising one or more memory units.
  • the memory 770 comprises instructions executable by the processor in network node 110.
  • the memory 770 is arranged to be used to store e.g. information, indications, data, configurations, and applications to perform the methods herein when being executed in the network node 110.
  • a computer program 780 comprises instructions, which when executed by the respective at least one processor 760, cause the at least one processor of the network node 110 to perform the actions above.
  • a respective carrier 790 comprises the respective computer program 780, wherein the carrier 790 is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.
  • the units in the network node 110 described above may refer to a combination of analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in the network node 110, that when executed by the respective one or more processors such as the processors described above.
  • processors as well as the other digital hardware, may be included in a single Application-Specific Integrated Circuitry (ASIC), or several processors and various digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a- chip (SoC).
  • ASIC Application-Specific Integrated Circuitry
  • SoC system-on-a- chip
  • a communication system includes a telecommunication network 3210 such as the wireless communication network 100, e.g. an loT network, or a WLAN, such as a 3GPP-type cellular network, which comprises an access network 3211, such as a radio access network, and a core network 3214.
  • the access network 3211 comprises a plurality of base stations 3212a, 3212b, 3212c, such as the network node 110, access nodes, AP STAs NBs, eNBs, gNBs or other types of wireless access points, 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) e.g. the UE 120 such as a Non-AP STA 3291 located in coverage area 3213c is configured to wirelessly connect to, or be paged by, the corresponding base station 3212c.
  • a second UE 3292 e.g. the wireless device 122 such as a Non-AP STA 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 8 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 3211, 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 communication originating from the UE 3291 towards the host computer 3230.
  • 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 3311 , which is stored in or accessible by the host computer 3310 and executable by the processing circuitry 3318.
  • the software 3311 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) 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 Figure 9) 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 communicate with the executing client application 3332 via the OTT connection 3350 terminating at the UE 3330 and the host computer 3310.
  • 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 Figure 9 may be identical to the host computer 3230, one of the base stations 3212a, 3212b, 3212c and one of the UEs 3291 , 3292 of Figure 8, respectively.
  • the inner workings of these entities may be as shown in Figure 9 and independently, the surrounding network topology may be that of Figure 8.
  • the OTT connection 3350 has been drawn abstractly to illustrate the communication between the host computer 3310 and the use 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 reconfiguration of the network).
  • 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 the applicable RAN effect: data rate, latency, power consumption, and thereby provide benefits such as corresponding effect on the OTT service: e.g. reduced user waiting time, relaxed restriction on file size, better responsiveness, extended battery lifetime.
  • 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 3311 of the host computer 3310 or in the software 3331 of the UE 3330, or both.
  • sensors (not shown) 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 3311, 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 3311, 3331 causes messages to be transmitted, in particular empty or ‘dummy’ messages, using the OTT connection 3350 while it monitors propagation times, errors etc.
  • Figure 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 such as the network node 112, and a UE such as the UE 120, which may be those described with reference to Figure 9 and Figure 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 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 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 such as an AP STA, and a UE such as a Non-AP STA which may be those described with reference to Figure 9 and Figure 8. For simplicity of the present disclosure, only drawing references to Figure 11 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 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 such as an AP STA, and a UE such as a Non-AP STA which may be those described with reference to Figure 9 and Figure 8.
  • a first action 3610 of the method 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 subaction 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. 13 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 such as an AP STA, and a UE such as a Non-AP STA which may be those described with reference to Figure 9 and Figure 8.
  • a first action 3710 of the method in accordance with the teachings of the embodiments described throughout this disclosure, 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.

Abstract

L'invention concerne un procédé mis en œuvre par un nœud de réseau permettant de limiter les détections de préambules erronés d'accès aléatoire, RA, dans une procédure de RA d'un équipement utilisateur, UE, à un premier point d'émission et de réception, TRP, dans une cellule multi-TRP d'un réseau de communication sans fil. Chaque TRP d'un ensemble de TRP détecte un ou plusieurs préambules respectifs. Le nœud de réseau obtient (501) pour chaque préambule détecté par un TRP de l'ensemble de TRP, une détection respective comprenant une identité de préambule, ID, une valeur de signal, laquelle valeur de signal est liée à une intensité de signal du préambule reçu, et une ID de TRP associée au TRP respectif détectant le préambule. Le nœud de réseau agrège (502) les détections obtenues en un ensemble de détections. Le nœud de réseau identifie (503), à partir de l'ensemble de détections, une ou plusieurs détections comprenant des ID de préambule en double. Pour chacune de la ou des détections comprenant des ID de préambule en double, le nœud de réseau réduit (504) l'ensemble de détections, en éliminant la détection en double avec la valeur de signal liée à la plus faible intensité de signal. Le nœud de réseau réduit (505) encore l'ensemble de détections, en éliminant une ou plusieurs détections identifiées comme des détections potentiellement erronées sur la base d'un ou de plusieurs éléments parmi : (A) un retard de propagation du préambule transmis de l'UE aux TRP respectifs et un emplacement de l'UE, et (B) une valeur de signal liée à une intensité de signal dans une détection de l'ensemble de détections étant inférieure à la valeur de signal liée à la plus forte intensité de signal dans l'ensemble de détections par au moins une valeur seuil. Le nœud de réseau identifie (506) un ou plusieurs candidats pour être le premier TRP sur la base de l'ensemble réduit final de détections.
PCT/SE2021/050604 2021-06-18 2021-06-18 Nœud de réseau et procédé pour limiter des préambules erronés WO2022265547A1 (fr)

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US20170013530A1 (en) * 2014-02-04 2017-01-12 Telefonaktiebolaget Lm Ericsson (Publ) Base station, and method for sector selection
WO2017215437A1 (fr) * 2016-06-12 2017-12-21 电信科学技术研究院 Procédé et dispositif à utiliser pour l'accès aléatoire
US20180124830A1 (en) * 2016-11-03 2018-05-03 Huawei Technologies Co., Ltd. Random access channel design, methods, and apparatus
EP3836651A1 (fr) * 2018-08-07 2021-06-16 Mitsubishi Electric Corporation Système de communication, terminal de communication et station de base

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150215968A1 (en) * 2014-01-27 2015-07-30 Texas Instruments Incorporated Random access channel false alarm control
US20170013530A1 (en) * 2014-02-04 2017-01-12 Telefonaktiebolaget Lm Ericsson (Publ) Base station, and method for sector selection
WO2017215437A1 (fr) * 2016-06-12 2017-12-21 电信科学技术研究院 Procédé et dispositif à utiliser pour l'accès aléatoire
US20180124830A1 (en) * 2016-11-03 2018-05-03 Huawei Technologies Co., Ltd. Random access channel design, methods, and apparatus
EP3836651A1 (fr) * 2018-08-07 2021-06-16 Mitsubishi Electric Corporation Système de communication, terminal de communication et station de base

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