Methods and apparatuses relating to wireless communication

Abstract

This specification describes a terminal device comprising: means for performing, in idle mode or inactive mode, measurements of signals received from one or more cells of a telecommunications network

Description

Field This specification relates generally to wireless communication. Background Terminal devices, sometimes referred to as 'user equipment' (UE), can communicate wirelessly with other terminal devices and / or base stations. Such communication may facilitate a variety of tasks. Summary In a first aspect, this specification describes a terminal device comprising: means for performing measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode; means for receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; and means for determining whether the terminal device is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information. In some examples the terminal device further comprises: means for, responsive to determining that the terminal device is unable or is not required to continue performance of the measurements, reporting the measurements to the telecommunications network without performance of any additional measurements of signals received from the one or more cells of the telecommunications network. In addition or alternatively, the means for determining may be configured to determine that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform at least one additional measurement of the signals within an allocated time. In some examples, the means for determining are configured to determine that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform measurements that meet a measurement quality threshold. In addition or alternatively, the means for determining may be configured to determine that the terminal device is not required to continue performance of the measurements based on a determination that a measurement quality threshold has already been met. In some such examples, the measurement quality threshold comprises a threshold number of measurements to be performed. In some such examples, wherein the threshold number of measurements is determined based on network conditions. In some examples, the means for determining are configured to determine that the terminal device is not required to continue performance of the measurements based on a determination that the terminal device has detected more than one primary synchronisation signal, PSS, or both a PSS and a secondary synchronisation signal, SSS. In a second aspect, this specification describes an apparatus (e.g. a terminal device) comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform operations comprising: performing measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode; receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; and determining whether the terminal device is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information. In some examples the operations further comprise: responsive to determining that the terminal device is unable or is not required to continue performance of the measurements, reporting the measurements to the telecommunications network without performance of any additional measurements of signals received from the one or more cells of the telecommunications network. In addition or alternatively, the determination may comprise determining that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform at least one additional measurement of the signals within an allocated time. In some examples, the determination may comprise determining that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform measurements that meet a measurement quality threshold. In addition or alternatively, the determination may comprise determining that the terminal device is not required to continue performance of the measurements based on a determination that a measurement quality threshold has already been met. In some such examples, the measurement quality threshold comprises a threshold number of measurements to be performed. In some such examples, wherein the threshold number of measurements is determined based on network conditions. In some examples, the determination may comprise determining that the terminal device is not required to continue performance of the measurements based on a determination that the terminal device has detected more than one primary synchronisation signal, PSS, or both a PSS and a secondary synchronisation signal, SSS. In a third aspect, this specification describes a method comprising: performing measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode; receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; and determining whether the terminal device is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information. In some examples the method further comprises: responsive to determining that the terminal device is unable or is not required to continue performance of the measurements, reporting the measurements to the telecommunications network without performance of any additional measurements of signals received from the one or more cells of the telecommunications network. In addition or alternatively, the determination may comprise determining that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform at least one additional measurement of the signals within an allocated time. In some examples, the determination may comprise determining that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform measurements that meet a measurement quality threshold. In addition or alternatively, the determination may comprise determining that the terminal device is not required to continue performance of the measurements based on a determination that a measurement quality threshold has already been met. In some such examples, the measurement quality threshold comprises a threshold number of measurements to be performed. In some such examples, wherein the threshold number of measurements is determined based on network conditions. In some examples, the determination may comprise determining that the terminal device is not required to continue performance of the measurements based on a determination that the terminal device has detected more than one primary synchronisation signal, PSS, or both a PSS and a secondary synchronisation signal, SSS. In a fourth aspect, this specification describes a non-transitory computer readable medium comprising program instructions stored thereon for performing at least any of the operations described above with reference to the third aspect. Brief Description of the Figs. For better understanding of the present application, reference will now be made by way of example to the accompanying drawings in which: Fig. 1 is an example illustrating communications between a terminal device and a plurality of base stations; Fig. 2 is a schematic illustration of operating modes of a terminal device; Fig. 3 is an example message flow sequence; Fig. 4 is a flowchart illustrating various operations which may be performed in accordance with examples described herein; Figure 5 is a schematic illustration of an example configuration of a terminal device which may be configured to perform various operations described with reference to Figures 1 to 4; Figure 6 is a schematic illustration of an example configuration of a base station which may be configured to perform various operations described with reference to Figures 1 to 4; and Figure 7 is an illustration of a computer-readable medium upon which computer readable code may be stored. Detailed Description In the description and drawings, like reference numerals refer to like elements throughout. In modern telecommunications networks, terminal devices may perform measurements of signals received from one or more cells of the network. In the example of Fig. 1, terminal device 100 is depicted together with cells 110 and 120. By way of example only, terminal device 100 is depicted as a smartphone and cells 110 and 120 are depicted as base stations. The network may configure terminal device 100 to perform measurements of signals received from one or more cells of the network. For instance, terminal device 100 may be configured to perform measurements of carrier signals received from one or more neighbouring cells. Such measurements may be reported to the network to facilitate the performance of various network tasks, such as choosing a target cell for cell reselection or making a handover decision. At any given time, a terminal device, such as terminal device 100, may be operating in one of a number of modes. For instance, these operating modes (or 'states') may comprise an idle mode, an inactive mode and / or a connected mode. These modes are described in greater detail below with reference to Fig. 2. A terminal device operating in the idle or inactive mode may perform measurements of signals received from one or more cells of the network (e.g. carrier measurements) for use in a cell reselection process. Usually, these measurements are validated and reported to the network upon transition into a connected mode. This process may be referred to as early measurement reporting (EMR). In 3GPP Release 18, terminal devices supporting the enhanced EMR feature (eEMR) are expected to be capable of performing eEMR measurement validation after RRC setup or resume. Specifically, validation is expected to start upon receipt of an RRC setup / resume message (for transitions to connected mode from idle and inactive modes respectively) and to continue after the RRC setup / resume process. Put another way, performance and validation of measurements usually performed by a terminal device operating in the idle or inactive mode may be extended to take place subsequent to a transition to the connected mode. Extending the measurement and validation procedure in this way may improve network performance, such as by improving delays during Secondary Cell (SCell) and / or Secondary Cell Group (SCG) setup. It may therefore be beneficial for the network to control whether or not the terminal device continues performance of measurements performed prior to a transition into the connected mode during or after the transition into the connected mode. It may also be beneficial for the network to control the manner in which the terminal device reports any such continued measurements to the network. Implementations of the technology described herein may provide such network-side control over measurement performance and / or measurement reporting. Various aspects of the technology described herein relate to a terminal device performing measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode; receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; and configuring the terminal device to continue the performance of the measurements of the signals in accordance with the configuration information. Other aspects of the technology described herein relate to the terminal device, instead of being configured to continue performance of the measurements, determining whether the terminal device is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information. As described in greater detail below with reference to Fig. 1, various implementations of the technology described herein may facilitate network-side control over measurement performance and / or measurement reporting. Put another way, various aspects of the technology described herein relate to defining a new event trigger for eEMR measurement reporting that defines how the terminal device shall perform measurements while operating in the connected mode (or during RRC setup / resume), and how it shall report the results of such measurements to the network. In some examples, the term 'terminal device' or 'user equipment' may refer to any device employed by a user to communicate. Whilst the terminal device of Fig. 1 is depicted as a mobile telephone or'smartphone', it will of course be appreciated that terminal devices may comprise various other devices, including, but not limited to laptops, smartwatches, tablet computers and vehicle-based terminal devices, such as those mounted on cars, buses, uncrewed aerial vehicles (UAVs), aeroplanes, trains, or boats. Alternatively, mobile terminal devices may be carried by a user, or worn on their person. In some examples, the term 'measurements' may refer to measurements, performed by a terminal device, of signals received from one or more cells of the network. For instance, each measurement may comprise a measurement of a carrier signal (e.g. a NR and / or E-UTRA carrier) received from a given cell. Based on such measurements, the terminal device and / or the network is able to make a determination as to the most suitable cells for handover and / or reselection. In the context of EMR, measurements performed in the idle or inactive mode are reported to the network after transition to a connected mode (e.g. once the connection has been made secure). When reporting such measurements to the network, measurements may be associated with a Physical Cell ID (PCI) which indicates which cell they correspond to. In some examples, the term 'terminal device operating mode' may refer to one of a number of modes (or 'states') that a terminal device, such as terminal device 100, may be operating in at a given time. For instance, as depicted in Fig. 2, these operating modes, indicated generally by the reference numeral 2, may comprise a connected mode 201 ('RRC^CONNECTED'), an inactive mode 202 ('RRC_INACTIVE') and an idle mode 203 ('RRC IDLE'). This particular terminology referring to the RRC operating modes follows the 3GPP specifications. Other systems may use another terminology but, generally, a connected mode refers to mode where a communication connection has been established between the terminal device and an access node such as a base station operating a cell. The establishment may include establishing a configuration, identification, and / or security key features for the connection at the terminal device and at the access node. The idle mode refers to a mode where such a connection does not exist, e.g. has been terminated. The inactive mode conventionally refers to a mode where the connection does exists but is in a standby or power-save state, called inactive mode. Responsive to receiving a message from the network (e.g. a Radio Resource Control, RRC, message), terminal device may transition from one mode to another. Various examples of such transitions are given below. In the connected mode 201, the terminal device is connected to a cell of the network (i.e. an RRC connection has been established). In this mode, responsive to receipt of release message (e.g. an 'RRCRelease' message), the terminal device may transition to the idle mode. Similarly, responsive to receipt of a release with suspend message(e.g. an 'RRCRelease' message with a 'suspend' configuration), the terminal device may transition to the inactive mode. In the inactive mode 202, the terminal device maintains a limited level of connectivity to a cell of the network so as to reduce network signalling load. As compared to the idle mode, the inactive mode may enable reduced latency when transitioning to the connected mode. In the inactive mode, responsive to receipt of a release message (e.g. an 'RRCRelease' message), the terminal device may transition to the idle mode. On the other hand, responsive to receipt of a resume message (e.g. an 'RRCResume' message), the terminal device may transition to the connected mode. In the idle mode 203, the terminal device is not connected to a particular cell of the network. As a result of the mobility of the terminal device during the idle mode, the terminal device may change the cell where it camps via cell reselection. In the idle mode, responsive to receipt of an establish message (e.g. an 'RRCSetup' message), the terminal device may transition to the connected mode. It will be appreciated that, when a terminal device is handed over from one cell to another, or when cell reselection is performed, other transitions may be possible. For instance, in a handover scenario, the terminal device may transition directly from a connected mode for a first cell to a connected mode for the second cell. On the other hand, in a cell reselection scenario, the terminal device may transition from an idle or inactive mode for a first cell to an idle or inactive mode for a second cell. Other modes and / or transitions may be apparent to the skilled reader. Various methods and apparatuses are described in detail below, by way of example only, in the context of a cellular network, such as an Evolved Universal Terrestrial Radio Access (E-UTRA) network or a 5G network. However, it will be appreciated that the techniques may be applicable with communications networks of other types (e.g. but not limited to other types of cellular network). Cellular networks may comprise one or more base stations, sometimes referred to as transmit-receive points (TRPs) or access points (e.g. but not limited to gNBs and / or eNBs). Whilst only two base stations are depicted in Figure 1, a radio access network (RAN, NG-RAN) may typically comprise thousands of such base stations. Together, the base stations may provide cellular network coverage to one or more terminal devices over a wide geographical area. Although by no means limited to such an implementation, the examples of the technology described herein may readily be integrated into any New Radio (NR) terminal device which performs measurements of signals received from one or more cells of the network, such as early measurement reporting (EMR) measurements (e.g. as standardised in 3GPP Release 16). Furthermore, examples of the technology described herein may be compliant with future enhancements to EMR behaviour which are expected to be specified in 3GPP Release 18. In some implementations and, for instance, depending on the characteristics of the cellular network, the base stations and terminal devices within the network may be configured to communicate with one another, for instance, using an OFDM-based communication scheme, such as orthogonal frequency-division multiple access (OFDMA), single carrier frequency-division multiple access (SC-FDMA), and / or cyclic prefix orthogonal frequency-division multiple access (CP-OFDMA). As mentioned above, Fig. 1 depicts a terminal device 100 together with cells 110 and 120. In the example of Fig. 1, terminal device 100 performs measurements of signals received from cells 110 and 120 for use in transitioning the terminal device to a connected mode (e.g. as part of a cell reselection process). The signals, which are denoted by arrows in Fig. 1, may comprise carrier signals. In such examples, each of the carrier signals may be identifiable as coming from a particular cell. As will be appreciated, the signal measurements may comprise any one or a combination of signal strength measurements and signal quality measurements. The measurements for transitioning the terminal device to the connected mode may comprise measurements performed while the terminal device was in an idle mode or an inactive mode, prior to the terminal device transitioning to the connected mode. In addition, the measurements for transitioning the terminal device to the connected mode may comprise cell reselection measurements and / or early measurement reporting, EMR, measurements. The terminal device may transition to the connected mode on the basis of the measurements performed while the terminal device was in the idle mode or inactive mode, after the transitioning and while terminal device 100 is in the connected mode or while the terminal device is transitioning to the connected mode, it receives, from at least one base station of the telecommunications network (e.g. the base station of cell 110 or 120), configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network. Having received the configuration information, the terminal device is configured to continue performance of the measurements of the signals in accordance with the configuration information. Put another way, the configuration information may define a measurement and / or reporting configuration for the terminal device. In an embodiment, the continuing performance of the measurements of signals may be understood such that the measurements performed for transitioning to the connected mode and the measurements continued have at least partially the same measurement configuration at the terminal device. For example, the measurements may be neighbour cell measurements and the terminal device may be configured to measure broadcast signals (e.g. reference signals) transmitted by cells. In other words, there is the continuation of the (partially) same measurements before transitioning to the connected mode and during and / or after the transitioning to the connected mode. However, the configuration information may change the measurement and / or reporting configuration for the subsequent continued measurements, as outlined in the embodiments below. In some examples, the configuration information comprises a duration within which the continued performance of the measurements is allowed to occur. In some such examples, the terminal device reports the measurements to the telecommunications network responsive to the duration expiring. Put another way, upon configuring the reporting configuration at the terminal device based on the received information, a timer is started. When the timer expires, the terminal device reports any measurement results that it has obtained to the network. In some examples, this may include reporting that no measurements have been obtained (e.g. because the carrier signals are too weak). The duration of the timer may be included in the configuration information received from the network. This embodiment provides for a clear and unambiguous way of reporting the measurement results. In addition or alternatively, the configuration information may indicate whether the terminal device should prioritise the continued performance of the measurements over performance of other measurements. Put another way, the configuration may indicate that the continued measurements have a higher or lower priority as compared to other measurement objects (MOs) or other radio resource management (RRM) measurements. This embodiment allows focusing limited measurement capabilities of the terminal device to most important measurements. In addition or alternatively, the configuration information may be indicative of a quality threshold. In this case, measurements of signals received from a given cell of the one or more cells are continued and / or reported if the signals received from the given cell meet the quality threshold. Put another way, the quality threshold may comprise a threshold value that the measurement results must meet to be reported to the network. For instance, only cells from which received signals yield measurements exceeding the threshold are reported. If the measurements for a given cell are below the threshold, the terminal device may omit those measurements from the report to the network. In other examples, the quality threshold could be measured against the current serving cell. In such examples, measurements corresponding to signals received from cells are only reported if they are indicative of a higher signal strength and / or quality than the serving cell. Accordingly, signalling overhead may be reduced. In other such examples, the measurements may be required to be of at least the serving cell quality minus an offset value (i.e. an A3 event with a negative offset). In yet other examples, the quality threshold may be used to determine whether the terminal device should start performing the connected mode measurements (i.e. the continued measurements). For instance, the terminal device may only continue performance of the measurements if the 'existing measurements' performed during the idle / inactive mode meet the quality threshold. If not, the terminal device may determine that performing further measurements is unlikely to be useful. In some examples, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to detect and, optionally, report to the network. In an embodiment, the configuration information may indicate how many cells the terminal device should detect in the MO frequency before selecting a cell to measure and / or report, e.g. the cell providing the strongest signal measured at the terminal device. For instance, this may be one to eight cells, or more or less. In this case, the terminal device may only be required to detect the cells, but is not necessarily required to measure those cells after the detection. In another embodiment, the terminal device may be required to first detect up to the maximum number of cells and, thereafter, select one of the detected cells and continues measurements for the selected cell only, thus omitting measurements of the other detected cells. In addition or alternatively, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to continue measurements of signals received from and / or to report results from to the network. Put another way, the configuration information may indicate how many cells the terminal device should search for within the MO frequency, thereby allowing the network to control how many cells the terminal device should attempt to measure and / or report. For instance, if this is set to one, the terminal device shall measure and report the first cell that it finds, irrespective of whether it is the strongest cell available in the frequency searched. In an embodiment where the configuration information indicates both the maximum number of cells for the terminal device to detect ( = maximum number of detected cells) and the maximum number of cells for the terminal device to continue the measurements (=maximum number of measured cells), the terminal device may first run measurements for the purpose of detecting the maximum number of detected cells. Upon detecting the maximum number of detected cells, the terminal device may select the maximum number of measured cells from the group of detected cells, e.g. the cell(s) providing the strongest signal measured at the terminal device. By way of example only, if the maximum number of detected cells is three and the maximum number of measured cells is one, the terminal device will detect a maximum of three cells, and select the strongest cell to measure out of those three cells. In addition or alternatively, the configuration information may be indicative of at least one measurement of the signals received from the one or more cells to be reported to the telecommunications network by the terminal device. For instance, the at least one measurement may comprise at least one of: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), and Reference Signal Signal-to-Interference-Plus-Noise-Ratio (RS-SINR). Put another way, the configuration information may indicate the quantity or quantities that should be measured and / or reported for each measured cell upon triggering the report. In addition or alternatively, the configuration information may comprise a list of cells which the terminal device is allowed to continue measurements of signals received from. In other words, the terminal device is only allowed to continue the measurements for and / or report cells from the indicated list of cells. In this way, the network may configure the terminal device such that it only measures and reports cells which the network is 'interested in'. In addition or alternatively, the configuration information may indicate whether the terminal device should report detected cells for which no measurements were performed. Put another way, the configuration information may indicate whether the report should include all cells (e.g. as indicated by their PCIs), even those for which no results were obtained. In addition or alternatively, the configuration information may indicate whether the terminal device should report Synchronization Signal Block (SSB) indices for the one or more cells. Put another way, the configuration information may whether the terminal device should decode and report SSB indices for each of the detected PCIs. The contents and structure of the configuration information are described in greater detail below with respect to Fig. 4. In some examples, the reporting configuration indicated by the received configuration information may be associated with a particular measurement ID (measID). In this regard, the reporting configuration is processed in a similar manner to in, for instance, Cell Global Identity (CGI) reporting. Specifically, the report is addressed using the measurement ID. Moreover, the report may be generated as a 'one-shot' measurement (i.e. the terminal device reports the measurement result once and then suspends the configuration), allowing the reporting to configuration to easily fit within the existing RRM event configuration. Once the terminal device 100 has performed the measurements and / or the continued measurements, the measurements and / or the continued measurements are reported to the telecommunications network. For instance, the measurements may be reported in an RRC message. In another embodiment, another message is used for the reporting, e.g. a medium access control (MAC) message. As mentioned above, subsequent to receiving the configuration information from the network, rather than being configured to continue performance of the measurements of the signals in accordance with the configuration information, the terminal device may, in some examples, instead determine whether it is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information. Responsive to determining that the terminal device is able to perform the continued measurements and that the continued measurements are required (i.e. a negative determination), the terminal device may perform and report the continued measurements in accordance with the received configuration information as described above. However, responsive to determining that the terminal device is unable or is not required to continue performance of the measurements, reporting the measurements to the telecommunications network without performance of any additional measurements of signals received from the one or more cells of the telecommunications network. For instance, this may allow the terminal device to avoid spending unnecessary energy on measurements that are not required or, for instance, would not be ready on time. The terminal device may be determined to be unable to continue performance of the measurements based on a determination that the terminal device is unable to perform at least one additional measurement of the signals within an allocated time. In addition or alternatively, the terminal device may be determined to be unable to continue performance of the measurements based on a determination that the terminal device is unable to perform measurements that meet a measurement quality threshold. In addition or alternatively, the terminal device may be determined to be not required to continue performance of the measurements based on a determination that a measurement quality threshold has already been met. For instance, the measurement quality threshold may comprise a threshold number of measurements to be performed. In some examples, the threshold number of measurements may be determined based on network conditions (e.g. as indicated by a SINR of received signals). In other examples, the threshold number of measurements may be preconfigured at the terminal device, or configured by the network. In addition or alternatively, the terminal device may be determined to be not required to continue performance of the measurements based on a determination that the terminal device has detected more than one primary synchronisation signal, PSS, or both a PSS and a secondary synchronisation signal, SSS. Put another way, the terminal device may omit performance of continued measurements if it is determined that the samples collected in the idle or inactive mode are strong enough. In this way, PCIs may be reported to the network more quickly, where permitted to do so by the RRC configuration. Put another way, when the terminal device is configured with the configuration information (i.e. with the 'event trigger'), it immediately evaluates whether it is able to perform the continued measurements within the allocated time or if the previous measurements do not satisfy the quality threshold for reporting. In the event of a negative determination (based on the current RRC configuration), the terminal device reports to the network immediately, with or without any measurements performed up to that point, and without performing any additional (i.e. continued) measurements, thereby contributing to power saving at the terminal device. This may be particularly beneficial in power-limited terminal devices such as smart phones and smart watches. In some examples, the terminal device may evaluate whether it is able to perform the continued measurements based on the parameters provided in the configuration, such as an example time for reporting (e.g. as given by a timer associated with the fastMeas configuration), a reference signal type, a quality threshold, or any other parameter in the configuration information. In addition or alternatively, the evaluation may be performed by estimating a duration required to perform the necessary measurements. This estimated duration is then compared to the allocated time for the measurements to perform the determination. Various evaluation criteria may be configured at the terminal device for performing the determination based on this comparison. For instance, the terminal device may determine whether to stop (or continue) the measurements based on the estimated duration being longer than (or equal to, less than, or less than or equal to) the allocated time for performing the measurements prior to reporting. The estimated time for performance of the measurements may be determined based on, for instance, any one or a combination of reference signal periodicity, event type, and a threshold used in performance of the measurements. Fig. 3 is a message flow sequence, indicated generally by the reference numeral 3, in accordance with some aspects of the described technology. The message flow sequence 3 shows an example implementation within which aspects of a process, such as that described with reference to Figures 1 and 2, may be performed. In this example, a terminal device 100 is shown in communication with a serving cell 110 and a neighbouring cell 120. It will be appreciated that various operations and entities described with reference to Figure 3 may correspond to operations and entities described with reference to the preceding Figures. For instance, the terminal device and cells described with reference to Fig. 3 may correspond to those described with reference to Figs. 1 and 2. It will be further appreciated that that various operations described with reference to Figure 3 may be performed by entities other than those expressly depicted. For instance, some or all of the operations attributed to the terminal device may be performed by another terminal device. Similarly, various operations attributed to cells 110 and 120 may be performed by other network entities, such as a core network (CN) entity, a Radio Access Node, or a base station (e.g. a base station in the serving cell of the terminal device 100). In operation 301, terminal device is configured to perform measurements (e.g. EMR measurements) during connection setup / resume. Put another way, the terminal device is configured to perform measurements of signals received from one or more network cells while the terminal device is transitioning from the idle / inactive mode to the connected mode. The terminal device may be triggered to generate a measurement report responsive to any of the following events, as specified in 3GPP TS 38.331. In the following list, the conditions in brackets indicate how the measurements may be used for choosing the target cell and making a handover decision): Event Al (Serving becomes better than threshold) Event A2 (Serving becomes worse than threshold) Event A3 (Neighbour becomes offset better than SpCell) Event A4 (Neighbour becomes better than threshold) Event A5 (SpCell becomes worse than thresholdl and neighbour becomes better than threshold2) Event A6 (Neighbour becomes offset better than SCell) Event Bl (Inter RAT neighbour becomes better than threshold) Event B2 (PCell becomes worse than thresholdl and inter RAT neighbour becomes better than threshold2) Event II (Interference becomes higher than threshold) Event Cl (The NR sidelink channel busy ratio is above a threshold) Event C2 (The NR sidelink channel busy ratio is below a threshold) Event DI (Distance between UE and referenceLocationl is above thresholdl and distance between UE and referenceLocation2 is below threshold2) CondEvent T1 (Time measured at UE is within a duration from threshold) Event XI (Serving L2 U2N Relay UE becomes worse than thresholdl and NR Cell becomes better than threshold2) Event X2 (Serving L2 U2N Relay UE becomes worse than threshold) Event Y1 (PCell becomes worse than thresholdl and candidate L2 U2N Relay UE becomes better than threshold2) Event Y2 (Candidate L2 U2N Relay UE becomes better than threshold) Operations 303 to 308 are enclosed within box 302, which indicates that these operations are performed while the terminal device is transitioning from the idle / inactive mode to the connected mode (i.e. during the connected setup / resume process). In operation 303, the terminal device connection setup is triggered, and the terminal device starts validation of measurements performed while in the idle / inactive mode. In operation 304, random access is performed between the terminal device and the serving cell. Put another way, a random access channel (RACH) process is performed to establish contact between the terminal device and the serving cell. In operation 305, the terminal device transmits an RRC Setup Request (when transitioning from idle mode) or an RRC Resume Request (when transitioning from inactive mode) message to the serving cell. In operation 306, responsive to the request for the connection to be (re) established in operation 305, the serving cell transmits an RRC Setup (when transitioning from idle mode) or an RRC Resume (when transitioning from inactive mode) message to the terminal device. In some examples, such as those in which the terminal device is configured to continue measurements during the transition between the idle / inactive mode and the connected mode, the configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network may be included in this message. In some examples, the terminal device may continue performance of eEMR measurements during the connected mode if (and only if) the network provides a measurement object (MO) corresponding to the measured frequency. In operation 307, responsive to receipt of the message in operation 306, the terminal device transmits an RRC Setup Complete (when transitioning from idle mode) or an RRC Resume Complete (when transitioning from inactive mode) message to the serving cell. Transmission of this message may indicate to the network that ongoing measurement validation is being performed by the terminal device. In operation 308, measurements of signals received from cell(s) are continued until an RRC Reconfiguration message is received. Operations 310 to 315 are enclosed within box 309, which indicates that these operations are performed while the terminal device is operating in the connected mode. The continued measurements may be ongoing during this period. In operation 310, a time-to-trigger (TTT) timer is started responsive to one or more event entry conditions being met. Put another way, this timer may run from the start of the event conditions until the action of the event is triggered. In operation 311, RRC Reconfiguration message is received at the terminal device from the network (e.g. via the RRC connection). In some examples, such as those in which the terminal device is configured to continue measurements while the terminal device is operating in the connected mode, the configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network may be included in this message. Put another way, this message may include an event configuration to continue measurements using a timer T332. In operation 312, a T322 timer is started. The period of time before this timer's expiry at operation 314 may indicate when measurements performed in accordance with the configuration included in the message of operation 311 may be performed. In operation 313, measurement validation and / or further continuation of the measurements is performed by the terminal device. In operation 314, timer T332 expires. This indicates that the period for measurement validation is over. In operation 315, a measurement report is transmitted to the network, including the validated measurements. Fig. 4 is a flowchart depicting various operations which may be performed in accordance with various examples. For instance, the operations depicted in Figure 4 may be executed by a terminal device or other suitable apparatus. In operation S4.1, a terminal device performs measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode. In operation S4.2, the terminal device receives, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network. In accordance with some aspects described herein, operation S4.3 is performed, in which it is determined whether the terminal device is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information. Put another way, the terminal device determines whether to continue performance of the measurements. As explained above, the determination as to whether the terminal device is unable or is not required to continue performance of the measurements may be based on various factors. For instance, the terminal device may not be required to continue performance of the measurements when the measurements are below a quality threshold. On the other hand, the terminal device may not be able to continue performance of the measurements if there is not enough time to perform enough measurements for the validation to be successfully validated (e.g. because a certain number of samples are required to meet a quality threshold). For instance, if the calculated measurement duration (as given, for instance, by the number of samples * RS periodicity * number of cells, e.g. based on max configuration) is greater than the amount of time left for the terminal device to perform measurements, then the result of the evaluation is negative (i.e. measurements are not continued). As will of course be appreciated, the terminal device may estimate the amount of time required to perform measurements in a variety of ways, using the configuration information and / or information relating to measurement capabilities of the terminal device (which may, for instance, be stored in a memory of the terminal device). In addition or alternatively, the terminal device may not be able to continue performance of the measurements for a given cell if that cell is not detected or does not remain detected throughout transition to connected mode and / or the measurement time. In some examples, the determination may be based on at least one of the following factors: - Event type - RS periodicity (e.g. SSB periodicity 20ms) - Quality threshold - Whether a given cell is detected or not - Number of samples required by the accuracy requirements Responsive to a determination at operation S4.3 that continued measurements are required and are able to be performed, the method proceeds to operation S4.4a, in which the terminal device is configured to continue the performance of the measurements of the signals in accordance with the configuration information. Responsive to a determination at operation S4.3 that continued measurements are not required or are unable to be performed, the method proceeds to operation S4.4b, in which the terminal device reports the measurements to the telecommunications network without performance of any additional measurements of signals received from the one or more cells of the telecommunications network. In examples in which operation S4.3 is not performed, the method may proceed straight to operation S4.4a without performing operation S4.4b. The operations of Fig. 4 have already been discussed in detail above, so such discussion will not be repeated here at length. As will of course be appreciated, various operations illustrated in Figure 4 may correspond to operations already described with reference to the preceding Figures. As explained above, the configuration information received by the terminal device for use in continuing performance of the measurements easily slots into the existing ReportConfigNR configuration. An example of such a configuration is shown below, with the bold text indicating how the configuration information described herein (denoted 'fastMeasConfig', short for 'fast measurement configuration') fits within a ReportConfigNR configuration: - ASN1START - TAG-REPORTCONFIGNR-START ReportConfigNR :: = reportType periodical eventTriggered SEQUENCE { CHOICE { PeriodicalReportConfig, EventTriggerConfig, ..., reportCGI reports FTD condTriggerConfig-rl6 cli-Periodical-rl6 ReportCGI, Reports FTD-NR, CondTriggerConfig-rl6, CLI-PeriodicalReportConfig-rl6, cli-EventTriggered-rl6 rxTxPeriodical-rl7 CLI-EventTriggerConfig-rl6, RxTxPeriodical-rl7, fastMeasConfig-rl8 } T FastMeasConfig-rl8 / FastMeasConfig-rl8 :: = reportingTimer-rl8 reportPCI-Only-rl8 measCellListNR-rl8 SEQUENCE{ ReportTimer-rl8, BOOLEAN, CellListNR-rl6 OPTIONAL, - Need R measPriority-rl8 maxReportCells-rl8 maxDetectedCells-rl8 MeasPriority-rl8 OPTIONAL, -- Need S INTEGER (1..maxCellReport) OPTIONAL, - Need R INTEGER (l..maxCellDetect-rl8) OPTIONAL, - Need R qualityThreshold-rl8 reportQuantityCell-rl8 QualityThreshold-rl8 OPTIONAL, — Need R MeasReportQuantity OPTIONAL, -- Need R rsType-rl8 ..., ■1 NR-RS-Type OPTIONAL, - Need R z QualityThreshold-rl8 rsrp-Threshold-N R-rl8 SEQUENCE{ RSRP-Range OPTIONAL, - Need R rsrq-Threshold-N R-rl8 RSRQ-Range OPTIONAL — Need R MeasPriority-rl8 ::= INTEGER (0..32) ReportTimer-rl8 ::= ENUMERATED { secO, sec5, seclO, sec30, sec60, secl20, secl80,sec240} NR-RS-Type ::= ENUMERATED {ssb, csi-rs} MeasReportQuantity :: = SEQUENCE{ rsrp BOOLEAN, rsrq BOOLEAN, sinr BOOLEAN } By way of example only, descriptions for the various fields included in the 'FastMeasConfig' can be found in the table below: FastMeasConfig Fields measCellListNR Indicates the list of NR. cells which the UE is requested to measure and / or report for NR measurements started during RRC connection setup / resume. measPriority Indicates the priority of the measurements performed for the evaluation of this event: The lower the value, the less prioritized the measurement. If this value is absent, the UE shall consider the priority to be 1. qualityThreshold Indicates the quality thresholds for reporting the measured cells for NR measurements started during RRC connection setup / resume. reportingTimer Indicates the duration for performing measurements started during RRC connection setup / resume for this measurement event. Value secO correspond to 0 seconds, value sec5 to 5 seconds and so on. reportPCI-Only Indicates whether UE is allowed to report only the detected PCIs without the measurement results, or whether UE shall always report measurement results together with the detected PCIs. reportQuantityCell The cell measurement quantities to be included in the measurement report. rsType Indicates the reported measurement type for the NR measurements started during RRC connection setup / resume. maxReportCells Indicates the number of cells UE should search for in the MO frequency. If set to 1 UE shall indicate the first cell it finds (regardless of whether that is the strongest cell available in the frequency). maxDetectedCells Indicates the number of cells UE should detect in the MO frequency before selecting a cell to measure. If MaxReportCells is set to 1 and maxDetectedCells is set to 3, UE shall select 1 cell of out 3 detected cells for full measurements. As will of course be appreciated, various fields depicted as being included in the configuration above may be omitted, re-ordered or otherwise modified. Moreover, the fields described in the table above may correspond to aspects described above with reference to Fig. 1. Fig. 5 is a schematic illustration of an example configuration of a computing apparatus 5 which may be configured to perform various operations described with reference to Figs. 1 to 4. Computing apparatus may comprise control apparatus 500 which is configured to control operation of other components which form part of the computing apparatus 5 thereby to enable performance of various operations described with reference to Figs. 1 to 4. The computing apparatus 500 may comprise processing apparatus 501 and memory 502. Computer-readable code 502-2A may be stored on the memory 502, which when executed by the processing apparatus 501, causes the control apparatus 500 to perform any of the operations described herein. In addition, computing apparatus may further include a display 503, user interactive interface (UII) 504, radio frequency interface 505 configured to interface radio frequency signals transmitted and received via a radio frequency antenna array 505A, and global navigation satellite system (GNSS) 506. In some examples, other satellite communications systems may be used instead of or in addition to GNSS 506. Fig. 6 is a schematic illustration of an example configuration of a base station 6 which may be configured to perform various operations described with reference to Figs. 1 to 4. The base station 6, which may be referred to an eNB or access point (AP), comprises control apparatus 600 which is configured to control operation of other components which form part of the base station 6 thereby to enable transmission of signals to and receipt of signals from UEs in its coverage area vicinity. For example, the base station control apparatus 600 is configured to cause transmission of reference signals to UEs within its coverage area. Furthermore, in some examples, the control apparatus 600 may be configured to enable receipt of reference signal measurement data and / or location data from the UEs in its coverage area. The control apparatus 600 may also enable communication with other base stations and / or other network nodes. The control apparatus 600 may additionally be configured to cause performance of any other operations described herein with reference to the base station 6. The base station 6 comprises a radio frequency antenna array 605 configured to receive and transmit radio frequency signals. Although the base station 6 in Fig. 6 is shown as having an array 605A of three antennas, this is illustrative only. The number of antennas may vary, for instance, from one to many hundreds. The base station 6 further comprises a radio frequency interface 605 configured to interface the radio frequency signals received and transmitted by the antenna 605A and a control apparatus 60. The radio frequency interface 605 may also be known as a transmitter, receiver and / or transceiver. The base station 6 may also comprise an interface 607 via which, for example, it can communicate with other network elements such as other radio access network entities (such as the other base stations) and / or core network entities. The base station control apparatus 600 may be configured to process signals from the radio frequency interface 605, to control the radio frequency interface 605 to generate suitable RF signals to communicate information to UEs via the wireless communications link, and also to exchange information with other base stations 6 and core network entities via the interface 607. The control apparatus 600 may comprise processing apparatus 601 and memory 602. Computer-readable code 602-2A may be stored on the memory 602, which when executed by the processing apparatus 601, causes the control apparatus 600 to perform any of the operations described herein and attributed to the base station 6. Some further details of components and features of the above-described devices / entities / apparatuses 5, 6 and alternatives for them will now be described. The control apparatuses described above 500, 600 may comprise processing apparatus 501, 601 communicatively coupled with memory 502, 602. The memory 502, 602 has computer readable instructions 502-2A, 602-2A stored thereon, which when executed by the processing apparatus 501, 601 causes the control apparatus 500, 600 to cause performance of various ones of the operations described with reference to Figs. 1 to 4. The control apparatus 500, 600 may in some instance be referred to, in general terms, as "apparatus". The processing apparatus 501, 601 may be of any suitable composition and may include one or more processors 501A, 601A of any suitable type or suitable combination of types. Indeed, the term "processing apparatus" should be understood to encompass computers having differing architectures such as single / multi-processor architectures and sequencers / parallel architectures. For example, the processing apparatus 501, 601 may be a programmable processor that interprets computer program instructions 502-2A, 602-2A and processes data. The processing apparatus 501, 601 may include plural programmable processors. Alternatively, the processing apparatus 501, 601 may be, for example, programmable hardware with embedded firmware. The processing apparatus 501, 601 may alternatively or additionally include one or more specialised circuit such as field programmable gate arrays FPGA, Application Specific Integrated Circuits (ASICs), signal processing devices etc. In some instances, processing apparatus 501, 601 may be referred to as computing apparatus or processing means. The processing apparatus 501, 601 is coupled to the memory 502, 602 and is operable to read / write data to / from the memory 502, 602. The memory 502, 602 may comprise a single memory unit or a plurality of memory units, upon which the computer readable instructions (or code) 502-2A, 602-2A is stored. For example, the memory 502, 602 may comprise both volatile memory 502-1, 602-1 and non-volatile memory 502-2, 602-2. In such examples, the computer readable instructions / program code 502-2A, 602-2A may be stored in the non-volatile memory 502-2, 602-2 and may be executed by the processing apparatus 501, 601 using the volatile memory 502-1, 602-1 for temporary storage of data or data and instructions. Examples of volatile memory include random-access memory (RAM), dynamic random-access memory (DRAM), and synchronous dynamic random-access memory (SDRAM) etc. Examples of non-volatile memory include read-only memory (ROM), programmable read-only memory (PROM), electronically erasable programmable read-only memory (EEPROM), flash memory, optical storage, magnetic storage, etc. The memory 502, 602 may be referred to as one or more non-transitory computer readable memory medium or one or more storage devices. Further, the term 'memory', in addition to covering memory comprising both one or more non-volatile memory and one or more volatile memory, may also cover one or more volatile memories only, one or more non-volatile memories only. In the context of this document, a "memory" or "computer-readable medium" may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer. The computer readable instructions / program code 502-2A, 602-2A may be preprogrammed into the control apparatus 500, 600. Alternatively, the computer readable instructions 502-2A, 602-2A may arrive at the control apparatus via an electromagnetic carrier signal or may be copied from a physical entity 7 such as a computer program product, a memory device or a record medium such as a compact disc read-only memory (CD-ROM) or digital versatile disc (DVD) an example of which is illustrated in Fig. 7. The computer readable instructions 502-2A, 602-2A may provide the logic and routines that enables the entities devices / apparatuses 5, 6 to perform the functionality described above. The combination of computer-readable instructions stored on memory (of any of the types described above) may be referred to as a computer program product. In general, references to computer program, instructions, code etc. should be understood to express software for a programmable processor firmware such as the programmable content of a hardware device as instructions for a processor or configured or configuration settings for a fixed function device, gate array, programmable logic device, etc. If desired, the different functions discussed herein may be performed in a different order and / or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined. Similarly, it will also be appreciated that the flow diagrams of Figs. 5 and 6 are examples only and that various operations depicted therein may be omitted, reordered and / or combined. Although the methods and apparatuses have been described in connection with an E-UTRA network, it will be appreciated that they are not limited to such networks and are applicable to radio networks of various different types. Although various aspects of the methods and apparatuses described herein are set out in the independent claims, other aspects may comprise other combinations of features from the described embodiments and / or the dependent claims with the features of the independent claims, and not solely the combinations explicitly set out in the claims. It is also noted herein that while various examples are described above, these descriptions should not be viewed in a limiting sense. Rather, there are several variations and modifications which may be made without departing from the scope of the present invention as defined in the appended claims. Finally, various additional aspects of the specification are described below. In a first aspect, this specification describes a terminal device comprising: means for performing measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode; means for receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; and means for configuring the terminal device to continue the performance of the measurements of the signals in accordance with the configuration information. In some examples, the measurements for transitioning the terminal device to the connected mode comprise measurements performed while the terminal device was in an idle mode or an inactive mode, prior to the terminal device transitioning to the connected mode. In some such examples, the measurements for transitioning the terminal device to the connected mode comprise at least one of: cell reselection measurements and / or early measurement reporting, EMR, measurements. In some examples, the configuration information comprises a duration within which the continued performance of the measurements is allowed to occur. In some such examples, the terminal device further comprises: means for reporting the measurements to the telecommunications network responsive to the duration expiring. In some examples, the configuration information indicates whether the terminal device should prioritise the continued performance of the measurements over performance of other measurements. In addition or alternatively, the configuration information is indicative of a quality threshold, and measurements of signals received from a given cell of the one or more cells are continued and / or reported, if the signals received from the given cell meet the quality threshold. In addition or alternatively, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to detect before continuing measurements of the signals received from the one or more cells. In addition or alternatively, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to continue measurements of signals received from. In addition or alternatively, the configuration information is indicative of at least one measurement of the signals received from the one or more cells to be reported to the telecommunications network by the terminal device. In some such examples, the at least one measurement comprises at least one of: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), and Reference Signal Signal-to-Interference-Plus-Noise-Ratio (RS-SINR). In some examples, the configuration information comprises a list of cells which the terminal device is allowed to continue measurements of signals received from. In addition or alternatively, the configuration information indicates whether the terminal device should report detected cells for which no measurements were performed. In addition or alternatively, the configuration information indicates whether the terminal device should report Synchronization Signal Block (SSB) indices for the one or more cells. In addition or alternatively, the terminal device further comprises: means for reporting the measurements and / or the continued measurements to the telecommunications network. In a second aspect, this specification describes a network node comprising: means for transmitting, to a terminal device, configuration information for use by the terminal device, while the terminal device is in a connected mode or is transitioning to the connected mode, in continuing performance of measurements of signals received from one or more cells of a telecommunications network that were performed for transitioning the terminal device to the connected mode and / or in reporting such continued measurements to the telecommunications network. In a third aspect, this specification describes an apparatus (e.g. a terminal device) comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform operations comprising: performing measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode; receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; and configuring the terminal device to continue the performance of the measurements of the signals in accordance with the configuration information. In some examples, the measurements for transitioning the terminal device to the connected mode comprise measurements performed while the terminal device was in an idle mode or an inactive mode, prior to the terminal device transitioning to the connected mode. In some such examples, the measurements for transitioning the terminal device to the connected mode comprise at least one of: cell reselection measurements and / or early measurement reporting, EMR, measurements. In some examples, the configuration information comprises a duration within which the continued performance of the measurements is allowed to occur. In some such examples, the operations further comprises: reporting the measurements to the telecommunications network responsive to the duration expiring. In some examples, the configuration information indicates whether the terminal device should prioritise the continued performance of the measurements over performance of other measurements. In addition or alternatively, the configuration information is indicative of a quality threshold, and measurements of signals received from a given cell of the one or more cells are continued and / or reported, if the signals received from the given cell meet the quality threshold. In addition or alternatively, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to detect before continuing measurements of the signals received from the one or more cells. In addition or alternatively, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to continue measurements of signals received from. In addition or alternatively, the configuration information is indicative of at least one measurement of the signals received from the one or more cells to be reported to the telecommunications network by the terminal device. In some such examples, the at least one measurement comprises at least one of: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), and Reference Signal Signal-to-Interference-Plus-Noise-Ratio (RS-SINR). In some examples, the configuration information comprises a list of cells which the terminal device is allowed to continue measurements of signals received from. In addition or alternatively, the configuration information indicates whether the terminal device should report detected cells for which no measurements were performed. In addition or alternatively, the configuration information indicates whether the terminal device should report Synchronization Signal Block (SSB) indices for the one or more cells. In addition or alternatively, the operations further comprise: reporting the measurements and / or the continued measurements to the telecommunications network. In a fourth aspect, this specification describes an apparatus (e.g. a network node or base station) comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform operations comprising: transmitting, to a terminal device, configuration information for use by the terminal device, while the terminal device is in a connected mode or is transitioning to the connected mode, in continuing performance of measurements of signals received from one or more cells of a telecommunications network that were performed for transitioning the terminal device to the connected mode and / or in reporting such continued measurements to the telecommunications network. In a fifth aspect, this specification describes a method comprising: performing, by a terminal device, measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode; receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; and configuring the terminal device to continue the performance of the measurements of the signals in accordance with the configuration information. In some examples, the measurements for transitioning the terminal device to the connected mode comprise measurements performed while the terminal device was in an idle mode or an inactive mode, prior to the terminal device transitioning to the connected mode. In some such examples, the measurements for transitioning the terminal device to the connected mode comprise at least one of: cell reselection measurements and / or early measurement reporting, EMR, measurements. In some examples, the configuration information comprises a duration within which the continued performance of the measurements is allowed to occur. In some such examples, the method further comprises: reporting the measurements to the telecommunications network responsive to the duration expiring. In some examples, the configuration information indicates whether the terminal device should prioritise the continued performance of the measurements over performance of other measurements. In addition or alternatively, the configuration information is indicative of a quality threshold, and measurements of signals received from a given cell of the one or more cells are continued and / or reported, if the signals received from the given cell meet the quality threshold. In addition or alternatively, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to detect before continuing measurements of the signals received from the one or more cells. In addition or alternatively, the configuration information is indicative of a maximum number of cells from the one or more cells for the terminal device to continue measurements of signals received from. In addition or alternatively, the configuration information is indicative of at least one measurement of the signals received from the one or more cells to be reported to the telecommunications network by the terminal device. In some such examples, the at least one measurement comprises at least one of: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), and Reference Signal Signal-to-Interference-Plus-Noise-Ratio (RS-SINR). In some examples, the configuration information comprises a list of cells which the terminal device is allowed to continue measurements of signals received from. In addition or alternatively, the configuration information indicates whether the terminal device should report detected cells for which no measurements were performed. In addition or alternatively, the configuration information indicates whether the terminal device should report Synchronization Signal Block (SSB) indices for the one or more cells. In addition or alternatively, the method further comprises: reporting the measurements and / or the continued measurements to the telecommunications network. In a sixth aspect, this specification describes a method comprising: transmitting, to a terminal device, configuration information for use by the terminal device, while the terminal device is in a connected mode or is transitioning to the connected mode, in continuing performance of measurements of signals received from one or more cells of a telecommunications network that were performed for transitioning the terminal device to the connected mode and / or in reporting such continued measurements to the telecommunications network. In a seventh aspect, this specification describes a method comprising: transmitting to a terminal device or receiving at the terminal device, configuration information for use by the terminal device, while the terminal device is in a connected mode or is 5 transitioning to the connected mode, in continuing performance of measurements of signals received from one or more cells of a telecommunications network that were performed for transitioning the terminal device to the connected mode and / or in reporting such continued measurements to the telecommunications network. 10 In an eighth aspect, this specification describes a non-transitory computer readable medium comprising program instructions stored thereon for performing at least any of the operations described above with reference to the fifth to seventh aspects. 15

Claims

1. A terminal device comprising:means for performing measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode;means for receiving, from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; andmeans for determining whether the terminal device is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information.

2. The terminal device of claim 1, further comprising:means for, responsive to determining that the terminal device is unable or is not required to continue performance of the measurements, reporting the measurements to the telecommunications network without performance of any additional measurements of signals received from the one or more cells of the telecommunications network.

3. The terminal device of claim 1 or claim 2,wherein the means for determining are configured to determine that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform at least one additional measurement of the signals within an allocated time.

4. The terminal device of any preceding claim,wherein the means for determining are configured to determine that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform measurements that meet a measurement quality threshold.

5. The terminal device of any preceding claim,wherein the means for determining are configured to determine that the terminal device is not required to continue performance of the measurements based on a determination that a measurement quality threshold has already been met.

6. The terminal device of claim 4 or claim 5, wherein the measurement quality threshold comprises a threshold number of measurements to be performed.

7. The terminal device of any one of claims 4 to 6, wherein the threshold number of measurements is determined based on network conditions.

8. The terminal device of any preceding claim, wherein the means for determining are configured to determine that the terminal device is not required to continue performance of the measurements based on a determination that the terminal device has detected more than one primary synchronisation signal, PSS, or both a PSS and a secondary synchronisation signal, SSS.

9. A method comprising:performing, by a terminal device, measurements of signals received from one or more cells of a telecommunications network for transitioning the terminal device to a connected mode;receiving, at the terminal device from at least one base station of the telecommunications network and while the terminal device is in the connected mode or is transitioning to the connected mode, configuration information for use by the terminal device in continuing performance of the measurements of signals received from the one or more cells of the telecommunications network and / or in reporting such continued performance of measurements to the telecommunications network; anddetermining, by the terminal device, whether the terminal device is unable or is not required to continue performance of the measurements of the signals in accordance with the configuration information.

10. The method of claim 1, further comprising:responsive to determining that the terminal device is unable or is not required to continue performance of the measurements, reporting the measurements to thetelecommunications network without performance of any additional measurements of signals received from the one or more cells of the telecommunications network.

11. The method of claim 1 or claim 2,wherein the means for determining are configured to determine that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform at least one additional measurement of the signals within an allocated time.

12. The method of any preceding claim,wherein the means for determining are configured to determine that the terminal device is unable to continue performance of the measurements based on a determination that the terminal device is unable to perform measurements that meet a measurement quality threshold.

13. The method of any preceding claim, wherein the means for determining are configured to determine that the terminal device is not required to continue performance of the measurements based on a determination that a measurement quality threshold has already been met.

14. The method of claim 12 or claim 13,wherein the measurement quality threshold comprises a threshold number of measurements to be performed.

15. The method of any one of claims 12 to 14wherein the threshold number of measurements is determined based on network conditions.36

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