WO2025110903A1

WO2025110903A1 - Methods, user equipment and network nodes for handling downlink reference signals of different receiving beams

Info

Publication number: WO2025110903A1
Application number: PCT/SE2023/051173
Authority: WO
Inventors: Andreas Nilsson; Joao VIEIRA
Original assignee: Telefonaktiebolaget LM Ericsson AB
Current assignee: Telefonaktiebolaget LM Ericsson AB
Priority date: 2023-11-21
Filing date: 2023-11-21
Publication date: 2025-05-30
Anticipated expiration: 2026-05-21

Abstract

A method performed by a UE (140) for handling Downlink Reference Signal, DL-RS, of different receiving beams (142, 144), the UE (140) being configured to receive signal via a first receiving beam (142) and a second receiving beam (144) from a network node (130), the method comprises: sending (204) a UE capability report to the network node (130), the UE capability report indicating a minimum guard time period; receiving (206) a configuration message from the network node (130), indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144); receiving (208), from the network node (130), the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144) with the guard time period in between.

Description

METHODS, USER EQUIPMENT AND NETWORK NODES FOR HANDLING DOWNLINK REFERENCE SIGNALS OF DIFFERENT RECEIVING BEAMS

TECHNICAL FIELD

[0001 ] The present disclosure relates generally to methods, user equipment and network nodes for handling downlink reference signals of different receiving beams. The present disclosure also relates to computer programs and carriers corresponding to the methods.

BACKGROUND

[0002] For 5G New Radio (NR), in high frequency range, e.g., 24.25 GHz to 71 .0 GHz (Frequency Range 2, FR2) or higher, multiple beams may be used to transmit and receive signals at a gNodeB (gNB) and/or a User Equipment (UE). For each downlink (DL) or transmitting (Tx) beam from a gNB, there is typically an associated best UE Receiving (Rx) beam for receiving the signals sent from such gNB DL beam. The gNB DL beam and the associated UE Rx beam form a beam pair. Suitable beam pairs can be identified through a so-called beam management procedure in NR.

[0003] In the beam management procedure, a DL beam of the gNB is typically identified by an associated DL reference signal (RS) transmitted in the DL beam, either periodically, semi-persistently, or aperiodically. DL-RSs are predefined signals occupying specific resource elements within the downlink time-frequency grid. The DL-RS for this purpose can be a Synchronization Signal (SS) and Physical Broadcast Channel (PBCH) block (SSB) or a Channel State Information RS (CSI- RS). The gNB transmits DL-RSs via all of its candidate DL beams to the UE. By measuring signal quality of all the DL-RSs, the UE can determine and report to the gNB the best DL beam to use for DL transmissions. Thus the best DL beam of the gNB is identified. The gNB can then transmit a burst of DL-RS in the best DL beam to all the candidate Rx beams of the UE. The UE measures signal quality of the DL- RSs received in all the candidate Rx beams, and a best Rx beam is identified. The signal quality can be Reference Signal Received Power (RSRP), Received Signal Strength Indication (RSSI), Reference Signal Receiving Quality (RSRQ), etc. [0004] Although not explicitly stated in the NR specification, the beam management discussed in above text is divided into three procedures, schematically illustrated in Fig. 1 : P1 : The purpose of P1 procedure is to find a coarse gNB Tx beam covering the whole angular sector of the UE; P2: The purpose of P2 is to refine the gNB Tx beam by doing a new beam search around the coarse direction found in P1 , i.e., identify a best gNB Tx beam by using DL-RS; P3: A beam sweep procedure. After the gNB Tx beam is defined, gNB sends DL-RS via the identified gNB Tx beam to all the candidate Rx beams of the UE. By measuring signal quality of the DL-RS received in all the candidate Rx beams, UE identifies a best Rx beam. Therefore, the best gNB Tx beam and the best UE Rx beam forms a beam pair for future bidirectional communication between the gNB and the UE.

[0005] In the beam management procedure discussed above, in P3, all the candidate Rx beams of the UE receives a DL-RS respectively in chronological order. The UE needs to switch from one Rx beam to another Rx beam when receiving the DL-RSs. However, the Rx beams of the UE can be analog beams, and the Rx beams can associate with different panels of the UE. As a result, the UE takes time when switching from one Rx beam to another. When the gNB continuously sends the DL-RSs to the UE, the UE may not switch fast from one Rx beam to another, resulting the DL-RS can be sent to a wrong receiving beam. Therefore, the measurement of corresponding signal quality can be inaccurate, and the choice of the best Rx beam can also be inaccurate.

[0006] Therefore, there is necessary to provide a solution to guarantee that the UE switches fast between Rx beams when receiving the DL-RSs in the P3 procedure.

SUMMARY

[0007] It is an object of the invention to address at least some of the problems and issues outlined above. It is an object of embodiments of the invention to provide a proper guard time period to enable the UE for fast switching between the Rx beams in P3 procedure. It is another object of embodiments of the invention to determine a best UE Rx beam in the P3 procedure. It is possible to achieve one or more of these objects and possibly others by using methods, UE and network nodes as defined in the attached independent claims.

[0008] According to an embodiment, a method performed by a User Equipment, UE for handling Downlink Reference Signal, DL-RS, of different receiving beams is disclosed. The UE being arranged to communicate with a network node of a wireless network, the UE being configured to receive signal in a first receiving beam and in a second receiving beam from the network node. The method comprises: sending a UE capability report to the network node, the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam and receiving a second DL-RS in the second receiving beam; receiving a configuration message from the network node, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam and receiving the second DL-RS in the second receiving beam, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; receiving, from the network node, the first DL-RS in the first receiving beam and receiving the second DL-RS in the second receiving beam, wherein the indicated guard time period is used in between the receiving of the first DL-RS in the first receiving beam and the receiving of the second DL-RS in the second receiving beam.

[0009] According to another embodiment, a method performed by a network node of a wireless network for handling Downlink Reference Signal, DL-RS, for different receiving beams is disclosed. The network node is arranged to communicate with the UE via the wireless network, the network node being configured to send signal in a first receiving beam and in a second receiving beam to the UE, the method comprises: receiving a UE capability report from the UE , the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam and receiving a second DL-RS in the second receiving beam; sending a configuration message to the UE, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam and receiving the second DL-RS in the second receiving beam, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; sending, to the UE , the first DL-RS in the first receiving beam and sending the second DL-RS in the second receiving beam , wherein the indicated guard time period is used in between the sending of the first DL-RS in the first receiving beam and the sending of the second DL-RS in the second receiving beam.

[00010] According to another embodiment, a User Equipment, UE, for handling Downlink Reference Signal, DL-RS, of different receiving beams is disclosed. The UE is arranged to communicate with a network node of a wireless network , the UE being configured to receive signal in a first receiving beam and in a second receiving beam from the network node, the UE comprises a processing circuitry and a memory, the memory containing instructions executable by the processing circuitry, whereby the UE is operative for: sending a UE capability report to the network node, the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam and receiving a second DL-RS in the second receiving beam; receiving a configuration message from the network node, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam and receiving the second DL-RS in the second receiving beam, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; receiving, from the network node, the first DL-RS in the first receiving beam and receiving the second DL-RS in the second receiving beam, wherein the indicated guard time period is used in between the receiving of the first DL-RS in the first receiving beam and the receiving of the second DL-RS in the second receiving beam.

[00011 ] According to another embodiment, a network node of a wireless network for handling Downlink Reference Signal, DL-RS, for different receiving beams is disclosed. The network node is arranged to communicate with the UE via the wireless network, the network node being configured to send signal in a first receiving beam and in a second receiving beam to the UE, the network node comprises a processing circuitry and a memory, the memory containing instructions executable by the processing circuitry, whereby the network node is operative for: receiving a UE capability report from the UE, the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam and receiving a second DL-RS in the second receiving beam; sending a configuration message to the UE, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam and receiving the second DL-RS in the second receiving beam, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; sending, to the UE , the first DL-RS in the first receiving beam and sending the second DL-RS in the second receiving beam, wherein the indicated guard time period is used in between the sending of the first DL-RS in the first receiving beam and the sending of the second DL-RS in the second receiving beam.

[00012] According to other aspects, computer programs and carriers are also provided, the details of which will be described in the claims and the detailed description.

[00013] Further possible features and benefits of this solution will become apparent from the detailed description below.

BRIEF DESCRIPTION OF DRAWINGS

[00014] The solution will now be described in more detail by means of exemplary embodiments and with reference to the accompanying drawings, in which:

[00015] Fig. 1 is a schematic diagram illustrating a beam management procedure in which the embodiments of the present invention may be used.

[00016] Fig. 2 is a schematic block diagram illustrating a network environment, according to possible embodiments.

[00017] Fig. 3 is a schematic block diagram illustrating the UE and its receiving beams, according to possible embodiments. [00018] Fig. 4 is a flow chart of the method performed by the UE, according to possible embodiments.

[00019] Fig. 5 is a flow chart of the method performed by the network node, according to possible embodiments.

[00020] Fig. 6 shows an example of DL-RS groups and guard period, according to possible embodiments.

[00021 ] Fig. 7 is a schematic block diagram illustrating signal interactions between the UE and the network node.

[00022] Fig. 8 and fig. 9 are schematic block diagrams illustrating the UE and the network node in detail, according to possible embodiments.

DETAILED DESCRIPTION

[00023] Fig. 2 is a schematic diagram illustrating a network environment in which the embodiments of the present invention may be used. A UE 140 can transmit and/or receive wireless signal to/from a network node 130 via a wireless network 150. The UE 140 can be, for example, a mobile phone, smart phone or a tablet/laptop with wireless connectivity.

[00024] The wireless network 150 where the network node 130 is situated may be any kind of wireless communication network. Example of such wireless communication networks are Global System for Mobile communication (GSM), Enhanced Data Rates for GSM Evolution (EDGE), Universal Mobile Telecommunications System (UMTS), Code Division Multiple Access 2000 (CDMA 2000), Long Term Evolution (LTE) Frequency Division Duplex (FDD) and Time Division Duplex (TDD), LTE Advanced, Wireless Local Area Networks (WLAN), Worldwide Interoperability for Microwave Access (WiMAX), WiMAX Advanced, as well as 5G wireless communication networks based on technology such as New Radio (NR), or even 6G.

[00025] Furthermore, the network node 130 can be any kind of network node, depending on the type of the wireless network 150, e.g., NodeB, eNodeB, gNodeB (as shown in fig. 2) etc. , as long as it is a network side device of the wireless network 150.

[00026] Fig. 3 schematically shows the UE 140 and its candidate receiving beams 142, 144 for receiving DL-RSs in P3. The UE 140 can receive the DL-RS via more candidate receiving beams, e.g., 146, etc.

[00027] The basic idea of the invention is that arranging a guard time period between the receiving beams receiving the DL-RSs respectively. The UE 140 reports a required minimum guard time period for the P3 procedure to the network node 130. The network node 130 sends the DL-RS to UE receiving beams 142, 144 with a guard time period, the guard time period is equal to or longer than the minimum guard time period reported by the UE 140. Therefore, the guard time period in the P3 procedure should be enough for the UE to fast switch receiving beams 142, 144, since it is equal to or longer than the minimum guard time period required by the UE 140 itself. Fig. 4, in conjunction with fig. 2 and fig. 3, describes a method performed by a User Equipment, UE 140 for handling Downlink Reference Signal, DL-RS, of different receiving beams 142, 144, the UE 140 being arranged to communicate with a network node 130 of a wireless network 150, the UE 140 being configured to receive signal in a first receiving beam 142 and in a second receiving beam 144 from the network node 130, the method comprises: sending 204 a UE capability report to the network node 140, the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam 142 and receiving a second DL-RS in the second receiving beam 144; receiving 206 a configuration message from the network node 130, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam 142 and receiving the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; receiving 208, from the network node 130, the first DL-RS in the first receiving beam 142 and receiving the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is used in between the receiving of the first DL-RS in the first receiving beam 142 and the receiving of the second DL-RS in the second receiving beam 144.

[00028] As explained above, the UE 140 receives the DL-RS from the network node 130 in at least two receiving beams 142 and 144. A first DL-RS is received in the first receiving beam 142 and a second DL-RS is received in the second receiving beam 144. The first and second DL-RSs have the same signal form but are sent in different times in different receiving beams 142 and 144 with a guard time period in between.

[00029] In the sending step 204, the UE 140 sends a UE capability report to the network node 130. The UE capability report indicates a minimum guard time period between receiving the DL-RSs in different receiving beams 142, 144, i.e., the minimum guard time period is the minimum time requirement of the UE 140 to switch from one receiving beam to another receiving beam for receiving the DL-RS.

[00030] In the receiving step 206, the configuration message received from the network node 130 comprises a DL-RS configuration, the DL-RS configuration indicates a guard time period which will be used in the next step. The guard time period is equal to or longer than the minimum guard time period indicated by the UE 140 in the step 204, so that it guarantees that the UE 140 has enough time to switch fast receiving beams when receiving the DL-RS in the next step.

[00031 ] In the receiving step 208, the UE 140 receives the first DL-RS in the first receiving beam 142 and receives the second DL-RS in the second receiving beam 144, with the guard time period indicated in the DL-RS configuration to switch between the first receiving beam 142 and the second receiving beam 144.

[00032] By such an embodiment, a guard time period is introduced between receiving the DL-RSs in different receiving beams 142, 144. The guard time period denotes a period associated with non-transmissions between subsequent transmissions of RSs during a P3 beam sweep procedure. The guard time period can be fixed in specification or depend on UE capability signaling. The UE 140 reports the minimum guard time period which is required by the UE 140, and the network node 130 confirms a guard time period in the configuration message. The confirmed guard time period is equal to or larger than the minimum guard time period. When the UE 140 receives the DL-RSs with the confirmed guard time period in between, the UE 140 has enough time to switch fast from one receiving beam to another receiving beam, e.g., from the first receiving beam 142 to the second receiving beam 144, and vice versa, when receiving the DL-RS. After receiving the DL-RSs in the two receiving beams 142, 144, signal qualities of the received DL- RSs can be obtained and a best receiving beam can be selected from the receiving beams 142, 144. Furthermore, if the receiving beams are more than two, e.g., as shown in the fig. 3, three receiving beams 142, 144, 146 are used, the DL-RSs can be received in the three receiving beams 142, 144, 146 with the guard period, and the best receiving beam can be selected from all the receiving beams 142, 144, 146. In other words, the P3 procedure can be performed smoothly. In general, a more accurate beam selection can be achieved, and lower beam sweep overheads are required to maintain a certain beam selection accuracy, due to improved beam selection accuracy. The selected receiving beam can be used for both transmitting and receiving signals between the UE 140 and the network node 130 in subsequent communications. The frequency used by P3 beam sweep procedure may be equal to or over 60 GHz, specifically 100 GHz. Therefore, this embodiment works well in the frequency equal to or over 60 GHz, specifically 100 GHz. According to another embodiment, the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

[00033] In Terahertz communication, Terahertz band (0.1 -10 THz) is envisioned one key candidate to support ultra-broadband connectivity for 6G communication and beyond.

[00034] One major impairment at such frequencies is increased phase noise, thus large sub-carrier spacings will be needed to combat such impairment. As a result, the OFDM symbol length used in Terahertz bands will be much smaller than in Frequency Range 1 (FR1 , up to 7GHz) or FR2. For example, the sub-carrier spacing envisioned for sub-Terahertz (0.1 -0.3THz) is of 960kHz (or 1920kHz) which will result in OFDM symbol times of around 1 ps, which is much smaller than the OFDM symbol length of 8.33 ps resulting for sub-carrier spacing of 120 kHz in FR2 bands. In addition, since the symbol time is very short in Terahertz communications, the link budget for the reference signals used during a P3 procedure might become unreliably low, which could deteriorate the beam sweep procedure.

[00035] Furthermore, much smaller OFDM symbol lengths than 1 ps can take place beyond sub-Terahertz bands, e.g. in Terahertz frequencies bands from 0.3THz to 10THz.

[00036] Therefore, this embodiment is specifically useful in Terahertz communication, that the UE 140 communicates with the network node 130 about the minimum guard time period in the form of OFDM symbol numbers. The minimum guard time period can comprise a required number of OFDM symbols, so as to guarantee that the UE 140 switches fast from one receiving beam 142 to another switching beam 144.

[00037] According to another embodiment, the first receiving beam 142 and the second receiving beam 144 are associated with one panel of the UE 140, or associated with two different panels of the UE 140. For example, the guard time period introduced between receiving the DL-RSs in different receiving beams 142, 144 could be applicable for switching between two beams belonging to the same UE panel.

[00038] In this embodiment, the UE 140 may comprise at least one panel. The receiving beam 142 and the receiving beam 144 can associate with one same UE panel, or associate with two different UE panels. If the UE 140 comprises more receiving beams, the receiving beams can associate with one same UE panel, or be grouped to associate with different UE panels.

[00039] According to another embodiment, the minimum guard time period is reported per panel of the UE 140.

[00040] In this embodiment, since the receiving beams can be associate to different UE panels, and each UE panel may require a certain time when switching between receiving beams, the UE capability report may comprise multiple minimum guard time periods. Each of the minimum guard time periods indicates a minimum guard time which relates to each UE panel. Alternatively, more than one panels can have one same minimum guard time period, resulting that fewer numbers of minimum guard time periods are reported.

[00041 ] According to another embodiment, the DL-RS configuration further indicates a DL-RS resource related to the DL-RS.

[00042] The DL-RS occupies certain downlink time/frequency resource. In the DLRS configuration, the resource occupied by the DL-RS is indicated to the UE 140.

[00043] According to another embodiment, the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE 140, or is reported per sub-carrier spacing of the DL-RS.

[00044] According to another embodiment, the UE 140 is configured to receive the DL-RS respectively in at least two receiving beams 142, 144, 146 including the first and the second receiving beams 142, 144, wherein the UE capability report further comprises a number of the at least two receiving beams 142, 144, 146.

[00045] Referring to fig. 2, the UE 140 receives the DL-RS in three receiving beams 142, 144, 146. The number of the receiving beams can be more than this. In the UE capability report, the UE 140 reports the number of the receiving beams, in this case the number is 3, to the network node 130. Therefore, the network node 130 sends the DL-RS in the three receiving beams. In subsequent procedures in P3, a best receiving beam can be selected among all the receiving beams 142, 144, 146.

[00046] According to another embodiment, the UE capability report further comprises an indicator indicating if the UE 140 supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams 142, 144.

[00047] According to another embodiment, when the UE capability report indicates that the UE 140 supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration received at step 206 by the UE 140 further indicating the repeated times of the DL-RS for each of the receiving beams 142, 144, the repeated times being the same as or lower than the supported maximum number, wherein the UE 140 receives 208 the first DL-RS and the second DL-RS in each of the first and second receiving beams 142, 144 for the repeated times respectively.

[00048] In this embodiment, the UE 140 reports to the network node 130 if it supports receiving the DL-RSs repeatedly for multiple times in each of the receiving beams. If the UE 140 supports receiving DL-RSs repeatedly, the network node 130 sends repeated DL-RSs in each of the receiving beams 142, 144. By doing so, each receiving beam receives multiple repeated DL-RSs. When obtaining the signal quality of the DL-RSs, the receiving beam can make average of the repeated DL- RSs and measure the signal quality. Since the noise of the received DL-RSs obey the Gaussian distribution, by averaging the repeated DL-RSs, the impact of the noise is reduced, and the obtained signal quality is more accurate. Therefore, the choice of the best receiving beam is also more accurate.

[00049] According to another embodiment, the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DL-RS configuration message further comprises a CSI report configuration related to the CSI-RS. CSI-RS is a typical DL-RS which is used in P3 procedure. A CSI report configuration is sent to the UE 140 when the CSI-RS is used.

[00050] According to another embodiment, the receiving 208 of the first DL-RS in the first receiving beam 142 and the receiving of the second DL-RS in the second receiving beam 144 further comprises: receiving a first group of DL-RSs in the first receiving beam 142 and receiving a second group of DL-RSs in the second receiving beam 144, wherein the indicated guard time period is used in between the receiving 208 of the first group of DL-RSs in the first receiving beam 142 and the receiving of the second group of DL-RS in the second receiving beam 144. The first group of DL-RSs and the second group of DL-RSs may be different groups with different DL-RS resources. [00051 ] In this embodiment, a first group of the DL-RSs is received in the first receiving beam 142, and a second group of the DL-RSs is received in the second receiving beam 144. Fig. 6 is an example during a P3 beam sweep procedure. Referring to fig. 6, as an example, the DL-RS is CSI-RS in this figure. One CSI-RS occupies certain resource, which is shown in a rectangular in the figure 6. The UE receives the CSI-RSs in four different receiving beams, and each receiving beam receives a group of the CSI-RSs, each group of the CSI-RSs comprises 4 CSI-RSs and occupies 4 CSI-RS resources. The guard period is shown in the fig. 6, which is used between receiving different CSI-RSs groups. In this example, the CSI-RS resources have been divided into 4 different CSI-RS resource groups, and the guard time period is only configured between different CSI-RS resource groups. The UE may use the same UE beam when receiving all 4 CSI-RS resources within one CSI- RS resource group, and switch to a new UE beam for each new CSI-RS resource group. In an alternative example, the same CSI-RS resource is used for each UE beam, but the CSI-RS resource is configured with a repetition factor, and the repetition factor of X means that the CSI-RS resource is repeated over X consecutive symbols.

[00052] By using DL-RS groups, it is not one DL-RS which is sent in each receiving beam. Instead, multiple DL-RSs are sent in one receiving beam as a group. When obtaining the signal quality, the signal quality of a group of DL-RSs is more reliable.

[00053] According to another embodiment, the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

[00054] In this embodiment, as illustrated in the fig. 6, a group of CSI-RSs is used as the group of DL-RSs. The CSI-RSs group occupies a group of CSI-RS resources. For example, the repetition factor of the CSI-RS is Y, and a same CSI-RS resource is repeated over Y symbols in time. In this situation, for each receiving beam, the UE can calculate an average or total RSRP by using the received CSI-RS over all the Y repeated symbols. [00055] According to another embodiment, a method performed by a network node 130 of a wireless network 150 is disclosed. The method is used for handling Downlink Reference Signal, DL-RS, for different receiving beams 142, 144, the network node 130 being arranged to communicate with the UE 140 via the wireless network 150, the network node 130 being configured to send signal in a first receiving beam 142 and in a second receiving beam 144 to the UE 140. The method comprises: receiving 304 a UE capability report from the UE 140, the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam 142 and receiving a second DL-RS in the second receiving beam 144; sending 306 a configuration message to the UE 140, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam 142 and receiving the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; sending 308, to the UE 140, the first DL-RS in the first receiving beam 142 and sending the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is used in between the sending of the first DL-RS in the first receiving beam 142 and the sending of the second DL-RS in the second receiving beam 144.

[00056] According to another embodiment, the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

[00057] According to another embodiment, the first receiving beam 142 and the second receiving beam 144 are associated with one panel of the UE 140, or associate with two different panels of the UE 140.

[00058] According to another embodiment, the minimum guard time period is reported per panel of the UE 140.

[00059] According to another embodiment, the DL-RS configuration comprises a DL-RS resource relate d to the DL-RS. [00060] According to another embodiment, the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE 140, or is reported per sub-carrier spacing of the DL-RS.

[00061 ] According to another embodiment, the network node 130 is configured to send the DL-RS respectively in at least two receiving beams 142, 144, 146, the at least two receiving beams 142, 144, 146 including the first and the second receiving beams 142, 144, wherein the UE capability report further comprises a number of the at least two receiving beams 142, 144, 146.

[00062] According to another embodiment, the UE capability report further comprises an indicator indicating if the UE 140 supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams 142, 144.

[00063] According to another embodiment, when the UE capability report indicates that the UE 140 supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration sent 306 by the network node 130 further indicating the repeated times of the DL-RS for each of the receiving beams 142, 144, the repeated times being the same as or lower than the supported maximum number, wherein the network node 130 sends 308 the first DL-RS and the second DL-RS in each of the first and second receiving beams 142, 144 for the repeated times respectively.

[00064] According to another embodiment, the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DL-RS configuration message further comprises a CSI report configuration related to the CSI-RS.

[00065] According to another embodiment, the sending 308 of the first DL-RS in the first receiving beam 142 and the sending of the second DL-RS in the second receiving beam 144 further comprises: sending a first group of DL-RSs in the first receiving beam 142 and sending a second group of DL-RSs in the second receiving beam 144, wherein the indicated guard time period is used in between the sending of the first group of DL-RSs in the first receiving beam 142 and the sending of the second group of DL-RSs in the second receiving beam 144.

[00066] According to another embodiment, wherein the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

[00067] Fig. 7 illustrates the signal interactions between the UE 140 and the network node 130. In the step 7.1 , the UE 140 sends a UE capability report to the network node 130. The UE capability report indicates a minimum guard time period required by the UE 140 when receiving DL-RSs in different receiving beams. The minimum guard time period can comprise at least one OFDM symbol. Alternatively, the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE 140, or reported per sub-carrier spacing of the DL-RS. Alternatively, the UE capability report further indicates the number of the receiving beams of the UE 140, if the UE 140 supports receiving repeated DL-RSs in each receiving beam and/or the maximum number of repeating. In the step 7.2, the network node 130 sends a configuration message to the UE 140. The configuration message comprises a DL-RS configuration, the DL-RS configuration indicates a guard time period, which will be the guard time period when sending the DL-RSs to the UE 140. The guard time period is equal to longer than the minimum guard time period. Alternatively, the DL-RS configuration further comprises a DL-RS resource related to the DL-RS. Alternatively, if the UE capability report indicates that the UE 140 supports receiving the DL-RSs repeatedly in each receiving beam, the DL-RS configuration further indicates the repeated times. The repeated times is the same as or lower than the maximum number of repeating indicated by the UE 140.

[00068] In the step 7.3, the network node 130 sends the DL-RSs in each of the receiving beams to the UE 140, according to the configuration message sent in the step 7.2. For example, the guard time period between the DL-RSs in different beams is the guard time period indicated in the configuration message. The resource occupied by the DL-RSs is the resource indicated in the configuration message. If the UE 140 supports receiving the DL-RSs for repeated times in each receiving beam, the network node 130 sends the DL-RSs repeatedly in each receiving beam, the repeating time is indicated in the configuration message. Alternatively, the DLRS can be a CSI-RS. A group of the DL-RSs can be sent in each of the receiving beams, and the guard time period is used between sending different groups of the DL-RS. In the step 7.4, the UE 140 receives the DL-RSs in each receiving beams, with the guard time period in between. Alternatively, the DL-RS is received for repeated times in each receiving beam and/or a group of DL-RSs is received in each receiving beam.

[00069] In the step 7.5, the UE 140 obtains signal qualities, e.g., RSRP of the received DL-RS in each receiving beam. A best receiving beam is selected based on the signal qualities. For example, if the DL-RSs are sent repeatedly in each receiving beam, an average signal quality can be obtained in each receiving beam. In the step 7.6, when the best receiving beam is selected, the UE 140 uses the selected receiving beam for both downlink and uplink communication between the UE 140 and the network node 130.

[00070] According to another embodiment, a User Equipment, UE 140, for handling Downlink Reference Signal, DL-RS, of different receiving beams 142, 144 is disclosed. The UE 140 being arranged to communicate with a network node 130 of a wireless network 150, the UE 140 being configured to receive signal in a first receiving beam 142 and in a second receiving beam 144 from the network node 130, the UE 140 comprises a processing circuitry 603 and a memory 604, the memory 604 containing instructions executable by the processing circuitry 603, whereby the UE 140 is operative for: sending a UE capability report to the network node 130, the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam 142 and receiving a second DLRS in the second receiving beam 144; receiving a configuration message from the network node 130, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam 142 and receiving the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; receiving, from the network node 130, the first DL-RS in the first receiving beam 142 and receiving the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is used in between the receiving of the first DL-RS in the first receiving beam 142 and the receiving of the second DL-RS in the second receiving beam 144.

[00071] According to another embodiment, the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

[00072] According to another embodiment, the first receiving beam 142 and the second receiving beam 144 are associated with one panel of the UE 140, or associated with two different panels of the UE 140.

[00073] According to another embodiment, the minimum guard time period is reported per panel of the UE 140.

[00074] According to another embodiment, the DL-RS configuration further indicates a DL-RS resource related to the DL-RS.

[00075] According to another embodiment, the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE 140, or is reported per sub-carrier spacing of the DL-RS.

[00076] According to another embodiment, the UE 140 is configured to receive the DL-RS respectively in at least two receiving beams 142, 144, 146 including the first and the second receiving beams 142, 144, wherein the UE capability report further comprises a number of the at least two receiving beams 142, 144, 146.

[00077] According to another embodiment, the UE capability report further comprises an indicator indicating if the UE 140 supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams 142, 144.

[00078] According to another embodiment, when the UE capability report indicates that the UE 140 supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration received 206 by the UE 140 further indicating the repeated times of the DL-RS for each of the receiving beams 142, 144, the repeated times being the same as or lower than the supported maximum number, wherein the UE 140 receives 208 the first DL-RS and the second DL-RS in each of the first and second receiving beams 142, 144 for the repeated times respectively.

[00079] According to another embodiment, the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DL-RS configuration message further comprises a CSI report configuration related to the CSI-RS.

[00080] According to another embodiment, the receiving of the first DL-RS in the first receiving beam 142 and the receiving of the second DL-RS in the second receiving beam 144 further comprises: receiving a first group of DL-RSs in the first receiving beam 142)and receiving a second group of DL-RSs in the second receiving beam 144, wherein the indicated guard time period is used in between the receiving of the first group of DL-RSs in the first receiving beam 142 and the receiving of the second group of DL-RS in the second receiving beam 144.

[00081 ] According to another embodiment, the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

[00082] According to another embodiment, a network node 130 of a wireless network 150 for handling Downlink Reference Signal, DL, for different receiving beams 142, 144 is disclosed. The network node 130 is arranged to communicate with the UE 140 via the wireless network 150, the network node 130 being configured to send signal in a first receiving beam 142 and in a second receiving beam 144 to the UE 140, the network node 130 comprises a processing circuitry 703 and a memory 704, the memory 704 containing instructions executable by the processing circuitry 703, whereby the network node 130 is operative for: receiving a UE capability report from the UE 140, the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam 142 and receiving a second DL-RS in the second receiving beam 144; sending a configuration message to the UE 140, the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam 142 and receiving the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; sending, to the UE 140, the first DL-RS in the first receiving beam 142 and sending the second DL-RS in the second receiving beam 144, wherein the indicated guard time period is used in between the sending of the first DL-RS in the first receiving beam 142 and the sending of the second DLRS in the second receiving beam 144.

[00083] According to another embodiment, the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

[00084] According to another embodiment, the first receiving beam 142 and the second receiving beam 144 are associated with one panel of the UE 140, or associated with two different panels of the UE 140.

[00085] According to another embodiment, the minimum guard time period is reported per panel of the UE 140.

[00086] According to another embodiment, the DL-RS configuration comprises a DL-RS resource related to the DL-RS.

[00087] According to another embodiment, the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE 140, or is reported per sub-carrier spacing of the DL-RS.

[00088] According to another embodiment, the network node 130 is configured to send the DL-RS respectively in at least two receiving beams 142, 144, 146, the at least two receiving beams 142, 144, 146 including the first and the second receiving beams 142, 144, wherein the UE capability report further comprises a number of the at least two receiving beams 142, 144, 146.

[00089] According to another embodiment, the UE capability report further comprises an indicator indicating if the UE 140 supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams 142, 144.

[00090] According to another embodiment, when the UE capability report indicates that the UE 140 supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration sent by the network node 130 further indicating the repeated times of the DL-RS for each of the receiving beams 142, 144, the repeated times being the same as or lower than the supported maximum number, wherein the network node 130 sends the first DL-RS and the second DL-RS in each of the first and second receiving beams 142, 144 for the repeated times respectively.

[00091 ] According to another embodiment, the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DL-RS configuration message further comprises a CSI report configuration related to the CSI-RS.

[00092] According to another embodiment, the sending of the first DL-RS in the first receiving beam 142 and the sending of the second DL-RS in the second receiving beam 144 further comprises: sending a first group of DL-RSs in the first receiving beam 142 and sending a second group of DL-RSs in the second receiving beam 144, wherein the indicated guard time period is used in between the sending of the first group of DL-RSs in the first receiving beam 142 and the sending of the second group of DL-RSs in the second receiving beam 144.

[00093] According to another embodiment, the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

[00094] According to other embodiments, referring to fig. 8, the UE 140 may further comprise a communication unit 602, which may be considered to comprise conventional means for communication with external devices, such as a transceiver for transmission and reception of signals. The instructions executable by said processing circuitry 603 may be arranged as a computer program 605 stored e.g. in said memory 604. The processing circuitry 603 and the memory 604 may be arranged in a sub-arrangement 601. The sub-arrangement 601 may be a microprocessor and adequate software and storage therefore, a Programmable Logic Device, PLD, or other electronic component(s)/processing circuit(s) configured to perform the methods mentioned above. The processing circuitry 603 may comprise one or more programmable processor, application-specific integrated circuits, field programmable gate arrays or combinations of these adapted to execute instructions. The UE 140 may also comprise a power supply, e.g., a battery.

[00095] The computer program 605 may be arranged such that when its instructions are run in the processing circuitry, they cause the UE 140 to perform the steps described in any of the described embodiments of the UE 140 and its method. The computer program 605 may be carried by a computer program product connectable to the processing circuitry 603. The computer program product may be the memory 604, or at least arranged in the memory. The memory 604 may be realized as for example a RAM (Random-access memory), ROM (Read-Only Memory) or an EEPROM (Electrical Erasable Programmable ROM). In some embodiments, a carrier may contain the computer program 605. The carrier may be one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or computer readable storage medium. The computer-readable storage medium may be e.g. a CD, DVD or flash memory, from which the program could be downloaded into the memory 604. Alternatively, the computer program may be stored on a server or any other entity to which the UE 140 has access via the communication unit 602. The computer program 605 may then be downloaded from the server into the memory 604.

[00096] According to other embodiments, referring to fig. 9, the network node 130 may further comprise a communication unit 702, which may be considered to comprise conventional means for communication with external devices, such as a transceiver for transmission and reception of signals. The instructions executable by said processing circuitry 703 may be arranged as a computer program 705 stored e.g. in said memory 704. The processing circuitry 703 and the memory 704 may be arranged in a sub-arrangement 701. The sub-arrangement 701 may be a micro- processor and adequate software and storage therefore, a Programmable Logic Device, PLD, or other electronic component(s)/processing circuit(s) configured to perform the methods mentioned above. The processing circuitry 703 may comprise one or more programmable processor, application-specific integrated circuits, field programmable gate arrays or combinations of these adapted to execute instructions. The network node 130 may also comprise a power supply, e.g., a battery.

[00097] The computer program 705 may be arranged such that when its instructions are run in the processing circuitry, they cause the network node 130 to perform the steps described in any of the described embodiments of the network node 130 and its method. The computer program 705 may be carried by a computer program product connectable to the processing circuitry 703. The computer program product may be the memory 704, or at least arranged in the memory. The memory 704 may be realized as for example a RAM (Random-access memory), ROM (Read-Only Memory) or an EEPROM (Electrical Erasable Programmable ROM). In some embodiments, a carrier may contain the computer program 705. The carrier may be one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or computer readable storage medium. The computer-readable storage medium may be e.g. a CD, DVD or flash memory, from which the program could be downloaded into the memory 704. Alternatively, the computer program may be stored on a server or any other entity to which the network node 130 has access via the communication unit 702. The computer program 705 may then be downloaded from the server into the memory 704.

[00098] Although the description above contains a plurality of specificities, these should not be construed as limiting the scope of the concept described herein but as merely providing illustrations of some exemplifying embodiments of the described concept. It will be appreciated that the scope of the presently described concept fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the presently described concept is accordingly not to be limited. Reference to an element in the singular is not intended to mean "one and only one" unless explicitly so stated, but rather "one or more." Further, the term “a number of”, such as in “a number of wireless devices” signifies one or more devices. All structural and functional equivalents to the elements of the abovedescribed embodiments that are known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed hereby. Moreover, it is not necessary for an apparatus or method to address each and every problem sought to be solved by the presently described concept, for it to be encompassed hereby. In the exemplary figures, a broken line generally signifies that the feature within the broken line is optional.

Claims

1. A method performed by a User Equipment, UE (140) for handling Downlink Reference Signal, DL-RS, of different receiving beams (142, 144), the UE (140) being arranged to communicate with a network node (130) of a wireless network (150), the UE (140) being configured to receive signal in a first receiving beam (142) and in a second receiving beam (144) from the network node (130), the method comprises: sending (204) a UE capability report to the network node (130), the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam (142) and receiving a second DL-RS in the second receiving beam (144); receiving (206) a configuration message from the network node (130), the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; receiving (208), from the network node (130), the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is used in between the receiving of the first DL-RS in the first receiving beam (142) and the receiving of the second DL-RS in the second receiving beam (144).

2. The method according to claim 1 , the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

3. The method according to any one of the preceding claims, wherein the first receiving beam (142) and the second receiving beam (144) are associated with one panel of the UE (140), or associated with two different panels of the UE (140).

4. The method according to claim 3, wherein the minimum guard time period is reported per panel of the UE (140).

5. The method according to any one of the preceding claims, wherein the DL-RS configuration further indicates a DL-RS resource related to the DL-RS.

6. The method according to any one of the preceding claims, wherein the minimum guard time period is reported for all sub-carrier spacings of the DLRS supported by the UE (140), or is reported per sub-carrier spacing of the DLRS.

7. The method according to any one of the preceding claims, wherein the UE (140) is configured to receive the DL-RS respectively in at least two receiving beams (142, 144, 146) including the first and the second receiving beams (142, 144), wherein the UE capability report further comprises a number of the at least two receiving beams (142, 144, 146).

8. The method according to any one of the preceding claims, wherein the UE capability report further comprises an indicator indicating if the UE (140) supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams (142, 144).

9. The method according to the claim 8, when the UE capability report indicates that the UE (140) supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration received (206) by the UE (140) further indicating the repeated times of the DL-RS for each of the receiving beams (142, 144), the repeated times being the same as or lower than the supported maximum number, wherein the UE (140) receives (208) the first DL-RS and the second DLRS in each of the first and second receiving beams (142, 144) for the repeated times respectively.

10. The method according to the any one of the preceding claims, wherein the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DL-RS configuration message further comprises a CSI report configuration related to the CSI-RS.

11 . The method according to any one of the preceding claims, wherein the receiving (208) of the first DL-RS in the first receiving beam (142) and the receiving of the second DL-RS in the second receiving beam (144) further comprises: receiving a first group of DL-RSs in the first receiving beam (142) and receiving a second group of DL-RSs in the second receiving beam (144), wherein the indicated guard time period is used in between the receiving (208) of the first group of DL-RSs in the first receiving beam (142) and the receiving of the second group of DL-RS in the second receiving beam (144).

12. The method according to the claim 11 , wherein the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

13. A method performed by a network node (130) of a wireless network (150) for handling Downlink Reference Signal, DL-RS, for different receiving beams (142, 144), the network node (130) being arranged to communicate with the UE (140) via the wireless network (150), the network node (130) being configured to send signal in a first receiving beam (142) and in a second receiving beam (144) to the UE (140), the method comprises: receiving (304) a UE capability report from the UE (140), the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam (142) and receiving a second DL-RS in the second receiving beam (144); sending (306) a configuration message to the UE (140), the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; sending (308), to the UE (140), the first DL-RS in the first receiving beam (142) and sending the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is used in between the sending of the first DL-RS in the first receiving beam (142) and the sending of the second DL-RS in the second receiving beam (144).

14. The method according to claim 13, the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

15. The method according to any one of the claims 13-14, wherein the first receiving beam (142) and the second receiving beam (144) are associated with one panel of the UE (140), or associated with two different panels of the UE (140).

16. The method according to claim 15, wherein the minimum guard time period is reported per panel of the UE (140).

17. The method according to any one of the claims 13-16, wherein the DL-RS configuration comprises a DL-RS resource related to the DL-RS.

18. The method according to any one of the claims 13-17, wherein the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE (140), or is reported per sub-carrier spacing of the DL-RS.

19. The method according to any one of the claims 13-18, wherein the network node (130) is configured to send the DL-RS respectively in at least two receiving beams (142, 144, 146), the at least two receiving beams (142, 144, 146) including the first and the second receiving beams (142, 144), wherein the UE capability report further comprises a number of the at least two receiving beams (142, 144, 146).

20. The method according to any one of the claims 13-19, wherein the UE capability report further comprises an indicator indicating if the UE (140) supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams (142, 144).

21 . The method according to the claim 20, when the UE capability report indicates that the UE (140) supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration sent (306) by the network node (130) further indicating the repeated times of the DL-RS for each of the receiving beams (142, 144), the repeated times being the same as or lower than the supported maximum number, wherein the network node (130) sends (308) the first DL-RS and the second DL-RS in each of the first and second receiving beams (142, 144) for the repeated times respectively.

22. The method according to any one of the claims 13-21 , wherein the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DL-RS configuration message further comprises a CSI report configuration related to the CSI-RS.

23. The method according to any one of the claims 13-22, the sending (308) of the first DL-RS in the first receiving beam (142) and the sending of the second DL-RS in the second receiving beam (144) further comprises: sending a first group of DL-RSs in the first receiving beam (142) and sending a second group of DL-RSs in the second receiving beam (144), wherein the indicated guard time period is used in between the sending of the first group of DL-RSs in the first receiving beam (142) and the sending of the second group of DL-RSs in the second receiving beam (144).

24. The method according to the claim 23, wherein the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

25. A User Equipment, UE (140), for handling Downlink Reference Signal, DL-RS, of different receiving beams (142, 144), the UE (140) being arranged to communicate with a network node (130) of a wireless network (150), the UE (140) being configured to receive signal in a first receiving beam (142) and in a second receiving beam (144) from the network node (130), the UE (140) comprises a processing circuitry (603) and a memory (604), the memory (604) containing instructions executable by the processing circuitry (603), whereby the UE (140) is operative for: sending a UE capability report to the network node (130), the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam (142) and receiving a second DL-RS in the second receiving beam (144); receiving a configuration message from the network node (130), the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; receiving, from the network node (130), the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is used in between the receiving of the first DL-RS in the first receiving beam (142) and the receiving of the second DL-RS in the second receiving beam (144).

26. The UE (140) according to claim 25, the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

27. The UE (140) according to claims 25 or 26, wherein the first receiving beam (142) and the second receiving beam (144) are associated with one panel of the UE (140), or associated with two different panels of the UE (140).

28. The UE (140) according to claim 27, wherein the minimum guard time period is reported per panel of the UE (140).

29. The UE (140) according to any one of the claims 25-28, wherein the DL-RS configuration further indicates a DL-RS resource related to the DL-RS.

30. The UE (140) according to any one of the claims 25-29, wherein the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE (140), or is reported per sub-carrier spacing of the DL-RS.

31. The UE (140) according to any one of the claims 25-30, wherein the UE (140) is configured to receive the DL-RS respectively in at least two receiving beams (142, 144, 146) including the first and the second receiving beams (142, 144), wherein the UE capability report further comprises a number of the at least two receiving beams (142, 144, 146)

32. The UE (140) according to any one of the claims 25-31 , wherein the UE capability report further comprises an indicator indicating if the UE (140) supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams (142, 144).

33. The UE (140) according to the claim 32, when the UE capability report indicates that the UE (140) supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration received by the UE (140) further indicating the repeated times of the DL-RS for each of the receiving beams (142, 144), the repeated times being the same as or lower than the supported maximum number, wherein the UE (140) receives the first DL-RS and the second DL-RS in each of the first and second receiving beams (142, 144) for the repeated times respectively.

34. The UE (140) according to the any one of the claims 25-33, wherein the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DLRS configuration message further comprises a CSI report configuration related to the CSI-RS.

35. The UE (140) according to any one of the claims 25-34, wherein the receiving of the first DL-RS in the first receiving beam (142) and the receiving of the second DL-RS in the second receiving beam (144) further comprises: receiving a first group of DL-RSs in the first receiving beam (142) and receiving a second group of DL-RSs in the second receiving beam (144), wherein the indicated guard time period is used in between the receiving of the first group of DL-RSs in the first receiving beam (142) and the receiving of the second group of DL-RS in the second receiving beam (144).

36. The UE (140) according to the claim 35, wherein the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

37. A network node (130) of a wireless network (150) for handling Downlink Reference Signal, DL-RS, for different receiving beams (142, 144), the network node (130) being arranged to communicate with the UE (140) via the wireless network (150), the network node (130) being configured to send signal in a first receiving beam (142) and in a second receiving beam (144) to the UE (140), the network node (130) comprises a processing circuitry (703) and a memory (704), the memory (704) containing instructions executable by the processing circuitry (703), whereby the network node (130) is operative for: receiving a UE capability report from the UE (140), the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam (142) and receiving a second DL-RS in the second receiving beam (144); sending a configuration message to the UE (140), the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; sending, to the UE (140), the first DL-RS in the first receiving beam (142) and sending the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is used in between the sending of the first DL-RS in the first receiving beam (142) and the sending of the second DL-RS in the second receiving beam (144).

38. The network node (130) according to claim 37, the minimum guard time period comprises at least one Orthogonal Frequency Division Multiplexing, OFDM symbol.

39. The network node (130) according to claims 37 or 38, wherein the first receiving beam (142) and the second receiving beam (144) are associated with one panel of the UE (140), or associated with two different panels of the UE (140).

40. The network node (130) according to claim 39, wherein the minimum guard time period is reported per panel of the UE (140).

41 . The network node (130) according to any one of the claims 37-40, wherein the DL-RS configuration comprises a DL-RS resource related to the DLRS.

42. The network node (130) according to any one of the claims 37-41 , wherein the minimum guard time period is reported for all sub-carrier spacings of the DL-RS supported by the UE (140), or is reported per sub-carrier spacing of the DL-RS.

43. The network node (130) according to any one of the claims 37-42, wherein the network node (130) is configured to send the DL-RS respectively in at least two receiving beams (142, 144, 146), the at least two receiving beams (142, 144, 146) including the first and the second receiving beams (142, 144), wherein the UE capability report further comprises a number of the at least two receiving beams (142, 144, 146).

44. The network node (130) according to any one of the claims 37-43, wherein the UE capability report further comprises an indicator indicating if the UE (140) supports receiving the DL-RSs repeatedly for multiple times in consecutive symbols in each of the receiving beams (142, 144).

45. The network node (130) according to the claim 44, when the UE capability report indicates that the UE (140) supports receiving the DL-RS repeatedly, the UE capability report further comprise a supported maximum number of the repeated times, wherein the DL-RS configuration sent by the network node (130) further indicating the repeated times of the DL-RS for each of the receiving beams (142, 144), the repeated times being the same as or lower than the supported maximum number, wherein the network node (130) sends the first DL-RS and the second DL-RS in each of the first and second receiving beams (142, 144) for the repeated times respectively.

46. The network node (130) according to any one of the claims 37-45, wherein the DL-RS is a Channel Status Information Reference Signal, CSI-RS, and the DL-RS configuration message further comprises a CSI report configuration related to the CSI-RS.

47. The network node (130) according to any one of the claims 37-46, the sending of the first DL-RS in the first receiving beam (142) and the sending of the second DL-RS in the second receiving beam (144) further comprises: sending a first group of DL-RSs in the first receiving beam (142) and sending a second group of DL-RSs in the second receiving beam (144), wherein the indicated guard time period is used in between the sending of the first group of DL-RSs in the first receiving beam (142) and the sending of the second group of DL-RSs in the second receiving beam (144).

48. The network node (130) according to the claim 47, wherein the first and second group of DL-RSs is configured by configuring a CSI-RS resource with a repetition factor, wherein the repetition factor is equal to the amount of DL-RSs in each group.

49. A computer program (605) comprising instructions, which, when executed by a processing circuitry (603) of a User Equipment, UE (140), for handling Downlink Reference Signal, DL-RS, of different receiving beams (142, 144), the UE (140) being arranged to communicate with a network node (130) of a wireless network (150), the UE (140) being configured to receive signal in a first receiving beam (142) and in a second receiving beam (144) from the network node (130), the computer program (605) causes the UE (140) to perform the following steps: sending a UE capability report to the network node (130), the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam (142) and receiving a second DL-RS in the second receiving beam (144); receiving a configuration message from the network node (130), the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; receiving, from the network node (130), the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is used in between the receiving of the first DL-RS in the first receiving beam (142) and the receiving of the second DL-RS in the second receiving beam (144).

50. A carrier containing the computer program (605) according to claim 49, wherein the carrier is one of an electronic signal, an optical signal, a radio signal, an electric signal, or a computer readable storage medium.

51 . A computer program (705) comprising instructions, which, when executed by a processing circuitry (703) of a network node (130), for handling Downlink Reference Signal, DL-RS, for different receiving beams (142, 144), the network node (130) being arranged to communicate with the UE (140) via the wireless network (150), the network node (130) being configured to send signal in a first receiving beam (142) and in a second receiving beam (144) to the UE (140), the computer program (705) causes the network node (130) to perform the following steps: receiving a UE capability report from the UE (140), the UE capability report indicating a minimum guard time period between receiving a first DL-RS in the first receiving beam (142) and receiving a second DL-RS in the second receiving beam (144); sending a configuration message to the UE (140), the configuration message comprises a DL-RS configuration, the DL-RS configuration indicating a guard time period to be used between receiving the first DL-RS in the first receiving beam (142) and receiving the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is equal to or longer than the minimum guard time period indicated in the UE capability report; sending, to the UE (140), the first DL-RS in the first receiving beam (142) and sending the second DL-RS in the second receiving beam (144), wherein the indicated guard time period is used in between the sending of the first DL-RS in the first receiving beam (142) and the sending of the second DL-RS in the second receiving beam (144).

52. A carrier containing the computer program (705) according to claim 51 , wherein the carrier is one of an electronic signal, an optical signal, a radio signal, an electric signal, or a computer readable storage medium.