GB2493183A

GB2493183A - Determining, from an uplink beacon signal, characteristics of a radio path and timing information and storing this information in a shared database

Info

Publication number: GB2493183A
Application number: GB1112918.6A
Authority: GB
Inventors: Henri Jani Llari Virta; Tommi Tapani Kangassuo; Jukka Rikhard Ala-Kokko
Original assignee: Renesas Mobile Corp
Current assignee: Renesas Electronics Corp
Priority date: 2011-07-27
Filing date: 2011-07-27
Publication date: 2013-01-30
Anticipated expiration: 2031-07-27
Also published as: GB2493183B; GB201112918D0

Abstract

An uplink beacon signal is transmitted from a terminal (UE) to a plurality of base stations (eNB A, eNB B, eNB C). For each radio path between the terminal and UE a respective measurement is obtained of a characteristic of the path, using the respect uplink beacon signals. The beacon signals are also used to determine a timing value for each path. The measured radio path characteristics and timing values are stored in a database which is common to a plurality of databases within the coverage area in which the terminal resides. For example, the database may be associated with a radio network controller (RNC). The beacon signals may be sounding reference signals (SRS) or a transmission burst in a dedicated random access channel. The characteristic of the radio path may be the received signal level. The database may be read and used when making a handover decision for the terminal.

Description

Cellular radio path measurement and reporting

Technical Field

The present invention relates to eeHular radio path measurement and reporting.

More specifically, the present invention relates to methods, apparatuses and computer program products for cellular radio path measurement and reporting.

Background

In the field of mobile communication systems, particularly cellular communication systems, one issue relates to radio path measurement and reporting, specifically neighbor measurement and reporting.

Conventionally, a terminal, such as a lIE, performs measurements with respect to its serving base station and neighbor base stations thereof, i.e. all base station in the coverage area or cell in which the terminal resides, and reports the results to the IS network, i.e. a network entity such as a RNC or the like. The network cain give the terminal information about what to measure, or the terminal may blindly (i.e. without any directives from the network) search and measure the neighbor base stations.

Such measurements typically relate to characteristics of the radio path (air interface) between the terminal and the respective base station, including e.g. quality and propagation measures.

The network can use the measurement reports from the terminal for decision making relating to mobility, for example in handover decisions. Also, the network can use the measurement reports to monitor and optimize transmission quality between the terminal and the respective base station. The terminal can use the measured results for similar decision making, for example in selecting the most suitable base station for an autonomous cell rcscleetion or the like.

Such conventional measurement and reporting consumes network capacity from the radio path (air interface) for transmitting measurement reports from the terminal to the network, and increases terminal power usage for performing measurements and transmitting measurement reports. Further, the transmission of measurement reports can utilize certain signaling channels that are not always available or may be degraded in terms of transmission capacity. As a result the terminal may have to wait until the signaling channel is available before being able to transmit measurement reports, or the volume of measurement results that can be transmitted in one measurement report may be limited, thereby resulting in latency or delay in transmission and in potential usage of the measurement results.

In ease of cell change (i.e. handover), the terminal needs to synchronize with the network before thc terminal can receive or transmit data. In particular, the terminal needs to obtain uplink synchronization (which can be done for example via random access procedure cxccution) before the terminal can transmit measurement reports to the network. However, obtaining uplink synchronization takes some time after cell change (i.e. handover), thereby resulting in latency or delay in transmission and in potential usage of the measurement results, and consumes tcrminal power, thercby resulting in a reduced battery lifetime of the terminal.

In view thereof there exist problems in terms of resource and power IS consumption as well as latency or delay in the context of cellular radio path measurement and reporting.

Thus, there is a need to further improve cellular radio path measurement and reporting.

Summary

Various exemplary embodiments of the present invention aim at addressing at least part of the above issues and/or problems and drawbacks.

Various aspects of exemplary embodiments of the present invention are set out in the appended claims.

According to an exemplary aspect of the present invention, there is provided a method comprising monitoring transmission of a beacon signal from a terminal, measuring characteristics of a radio path towards the terminal based on a received beacon signal from the terminal, determining a timing value of the received beacon signal from the terminal, and initiating storage of the measured characteristics and the determined timing value as data with respect to the terminal in a network-based database, the network-based database being common for base stations in a coverage area in which the terminal resides. The embodiment is particularly suited to conducting cellular radio path measurement and reporting, in particular by e.g. a base station in a cellular network.

According to an exemplary aspect of the present invention, there is provided a method comprising initiating transmission of a beacon signal of a terminal towards base stations in a coverage area in which the terminal resides, and receiving a result of measurements relating to at least one of a radio path and a timing between the terminal and one or more of said base stations from a base station currently serving thc terminal. The embodiment is particularly suited to conducting cellular radio path measurement and reporting, in particular by e.g. a user equipment in a cellular network.

According to an exemplary aspect of the present invention, there is provided an apparatus comprising a processing system which may, for example, be configured as at least one processor, at least one memory including computer program code, and I 5 at least one interface configured for communication with at least another apparatus.

The processing system is arranged to cause the apparatus to perform: monitoring transmission of a beacon signal from a terminal, measuring characteristics of a radio path towards the terminal based on a received beacon signal from the terminal, determining a timing value of the received beacon signal from the terminal, and initiating storage of the measured characteristics and the determined timing value as data with respect to the terminal in a network-based database, the network-based database being common for base stations in a coverage area in which the terminal resides. The embodiment is particularly suited to conducting cellular radio path measurement and reporting, in particular by e.g. a base station in a cellular network.

According to an exemplary aspect of the present invention, there is provided an apparatus comprising a processing system, which may for example be configured as at least one processor, at least one memory including computer program code, and at least one interface configured for communication with at least another apparatus.

The processing system is arranged to cause the apparatus to perform: initiating transmission of a beacon signal of a terminal towards base stations in a coverage area in which the terminal resides, and receiving a result of measurements relating to at least one of a radio path and a timing between the terminal and one or more of said base stations from a base station currently serving the terminal. The embodiment is particularly suited to conducting cellular radio path measurement and reporting, in particular by e.g. a user equipment in a ceHular network.

According to an exemplary aspect of the present invention, there is provided computer program products comprising sets of computer-executable instructions which, when a respective set of instructions is executed by a computing device, is configured to cause the computing device (e.g. a processor of an apparatus according to any one of the aforementioned apparatus-related aspects) to carry out the method according to any one of the aforementioned method-related aspects.

Further developments and/or modifications of the aforementioned aspects of the present invention, which are conceivable according to exemplary embodiments of the present invention, arc derivable from the subsequent description.

By way of exemplary embodiments of the present invention, there is provided IS feasibility of advanced cellular rad[o path measurement and reporting. More specifically, by way of exemplary embodiments of the present invention, there are provided methods and apparatus for advanced cellular radio path measurement and reporting.

Thus, improvement is achieved by methods, devices and computer program products enabling advanced cellular radio path measurement and reporting.

Brief Description of Drawings

For a more complete understanding of exemplary embodiments of the present invention, reference is now made to the following description taken in connection with the accompanying drawings in which: Figure 1 shows a schematic diagram illustrating a system-related overview relating to beacon signal transmission and data storage according to exemplary embodiments of the present invention, Figure 2 shows a flowchart illustrating an example of a network-sided procedure according to exemplary embodiments of the present invention, Figure 3 shows a flowchart illustrating an example of a terminal-sided procedure according to exemplary embodiments of the present invention, Figure 4 shows a signaling diagram illustrating various procedures according to exemplary embodiments of the present invention, Figure 5 shows a schematic diagram illustrating a system-related overview relating to uplink timing calculation according to exemplary embodiments of the present invention, and Figure 6 shows a block diagram illustrating exemplary apparatuses according to cxcmplary embodiments of thc present invention.

Detailed Description

Exemplary aspects of the present invention will be described herein below.

More specifically, exemplary aspects of the present invention are described hereinafter with reference to particular non-limiting examples and to what are I 5 presently considered to be conceivable embodiments of the present invention. A person skilled in the art will appreciate that the invention is by no means limited to these examples, and may be more broadly applied.

It is to be noted that the following exemplary description mainly refers to specifications being used as non-limiting examples for certain exemplary network configurations and deployments. In particular, for the applicability of thus described exemplary aspects and embodiments, LTE-(including LTE-Advanced-) related cellular communication networks are used as non-limiting examples. As such, the description of exemplary aspects and embodiments given herein specifically refers to terminology which is directly related thereto. Such terminology is only used in the context of the presented non-limiting examples, and does naturally not limit the invention in any way. Rather, any other communication systems, network configurations or system deployments, etc. may also be utilized as long as compliant with the features described herein.

Hereinafter, various embodiments and implementations of the present invention and its aspects or embodiments are described using several alternatives. It is generally noted that, according to certain needs and constraints, all of the described alternatives may be provided alone or in any conceivable combination (also including combinations of individual features of the various alternatives).

According to exemplary embodiments of the present invention, in general terms, there are provided methods and apparatus for cellular radio path measurement and reporting.

In the following, exemplary embodiments of the present invention are described with reference to methods, procedures and functions, as well as with reference to structural arrangements and configurations.

Figure 1 show's a schcmatic diagram illustrating a system-related overview relating to beacon signal transmission and data storage according to exemplary embodiments of the present invention.

As shown in Figure 1, an exemplary system configuration according to exemplary embodiments of the present invention comprises a terminal UE, three base stations eNB A, eNB B and eNB C, in the coverage area or cell in which the terminal IS LIE resides, while base station eNB B is assumed to be the serving base station of the UE, and a database DB representing a network-based database such as a central data storage which may be implemented at any network entity such as a RNC or the like. It is noted that the present invention and embodiments thereof are not limited to such exemplary system configuration.

In the exemplary system configuration of Figure 1, the terminal UE sends a beacon signal denoted by Sounding Reference Signals (SRS) to the base stations which monitor the UE-transmitted beacon signal. Upon receipt of the beacon signal, a respective base station performs measurements and/or determinations relating to the radio path and!or timing properties and the like, and stores the measurement and/or determination results with respect to the terminal UE in the network-based database.

In Figure 1, it is indicated that such results denoted as "meas results" for the terminal UE with identifier UE ID are provided by each respective base station eNB x (x = A, B, C) to the DB. In the DB, the measurement and/or determination results from all of the base stations relevant for the terminal UE are stored e.g. in a table. In the example according to Figure 1, the measurement and/or determination results from the base stations comprise a level value indicating a quality characteristic of the respective radio path, a timing value indicating a Liming difference between the received beacon signal and the timing of the respective base station, and a load value indicating a processing load at the respective base station. Such data could then be utilized by the network, e.g. the serving base station eNB B, for further processing as outlined below, such as e.g. decision making, control, calculation of an uplink timing, and the like.

Based thereon, the network, e.g. the serving base station eNB B, can provide the terminal with corresponding information, data, results, commands, and the like.

According to exemplary embodiments of the present invention, the network utilizes a UE-transmitted bcacon signal to determine characteristics (e.g. quality and propagation) of the radio path between the IJE and specific base stations. To this end, the network has specific base stations that constantly monitor a specific frequency or channel over which UE(s) are sending the beacon signal. Such specific base stations can be certain ones or all base stations of the network, which are correspondingly configured for monitoring purposes (and associated purposes described hereinafter).

IS Separation of different UEs transmitting the beacon signal can be made by a IJE identifier encoded in the beacon signal and!or a transmission code used for the beacon signal transmission.

For example, in LTE system, the network can utilize a IJE-transmitted Sounding Reference Symbol (SRS) as beacon signal, and the UE can use a dedicated RNTI value for encoding the signal, i.e. for providing the UE identity by way of encoding to the beacon signal. Another example of a beacon signal, which is applicable to several network technologies, is to use a transmission burst sent in a dedicated random access channel. In CDMA systems, transmissions are separated by the scrambling code (representing a transmission code) which is used to identify the liE. The HE identity can be a separately signaled RNTI value used for this purpose, or a C-RNTI value used also for other purposes like data transfer. In this regard, the network previously allocates unique RNTI values for each HE sending the beacon signal in this network environment. If a separate RNTI value for the beacon transmission is used, the HE identity can be provided to the HE for example in connection setup phase.

On the basis of the received beacon signal, each base station measures characteristics relating to its radio path to the liE, including e.g. the signal level, the quality, the delay of the beacon signal sent by the liE, or the like. Further, each base station determines a timing value of the received beacon signal, i.e. a timing difference between the received beacon signal and the timing of the base station as such.

The measurement results and timing from each base station are stored in the DB representing a centralized data storage.

The individual base stations can also determine and report additional information in the measurement reports, including for example information which is not available from measurements performed by the liE itself Such additional information can for example comprise processing load information relating to the respective base station, which the TIE can then eventually utilize for mobility decisions or the like. Such additional information could also be stored in the DB with IS respect to the TIE, as indicated in the column denoted "load" in Figure 1.

From the collected results, namely measurement results and timing data from different base stations, the FE's serving base station can for example utilize these results for making handover decisions, initiating and/or executing handovcr procedures, controlling measurement and/or reporting requirements (e.g. adjusting the need for measurements to be performed by the TIE), reporting the reading results to the TIE, and adjusting the rcading results to be reported to the TIE. Such results, possibly in connection with corresponding measurement results and the like, when being reported/sent to the liE, can be utilized by the TIE accordingly. For example, the making of (autonomous) reselection decisions could be made by the TIE in view of certain adjustments to the reported results at the network side, for example measurement results from heavily loaded base stations are not reported.

In view of the above, the network according to exemplary embodiments of the present invention comprises means of gathering the measured and determined results from the base stations, monitoring the TJE-fransmitted beacon signal, and utilizing the results for controlling purposes, e.g. for controlling the measurements and reporting performed by UE, the reporting performed by the network towards the UE, mobility decisions, and providing uplink timing between the UE and the base stations. For example, by collecting the results to a centralized data storage, which stores measurements between one UE and one or several base stations, the network can utilize these measurements accordingly.

Figure 2 shows a flowchart illustrating an example of a network-sided procedure according to exemplary embodiments of the present invention. The method of Figure 2 is operable at or by a base station (or access node) of a cellular communication system, e.g. by an cNB of a LTE system or the like, such as any one of base stations eNB A, cNB B and cNB C according to Figure 1.

As shown in Figure 2 (by way of solid line boxes), a method according to exemplary embodiments of the present invention comprises an operation of monitoring (210) transmission of a beacon signal from a terminal, an operation of measuring (220) characteristics of a radio path (from the base station carrying out the method) towards the terminal based on a received beacon signal from the terminal, an IS operation of determining (230) a timing value of the received beacon signal from the terminal, and an operation of initiating (240) storage of the measured characteristics and the determined timing value with respect to the terminal in a network-based database which is common for base stations in a coverage area in which the terminal resides.

As shown in Figure 2 (by way of dashed line boxes indicating optional opcrations), a method according to exemplary embodimcnts of the present invention may also comprise an operation of identifying (215) the terminal, wherein one of a terminal identifier encoded in the received beacon signal and a transmission code used for the bcacon signal transmission may be used, and/or an operation of dctcrmining (235) a processing load, wherein in such case the storage initiation operation (240) also comprises initiating storage of the determined processing load as (additional) data with respect to the terminal in the network-based database.

Figure 3 shows a flowchart illustrating an example of a terminal-side procedure according to exemplary embodiments of the present invention. The method of Figure 3 is operable at or by a terminal (or user equipment) configured for opcration in a cellular communication system, e.g. by a HE of a LTE system or the like, such as the termina' UE according to Figure 1.

As shown in Figure 3 (by way of solid line boxes), a method according to exemplary embodiments of the present invention comprises an operation of initiating (310) transmission of a beacon signal of a terminal towards base stations in a coverage area in which the terminal resides, and an operation of receiving (320) a result of measurements relating to at least one of a radio path and a timing between the terminal and one or more of said base stations from a base station currently serving the terminal.

As shown in Figure 3 (by way of a dashed line box indicating an optional operation), a method according to exemplary embodiments of the present invention may also comprise an operation of providing (215) terminal identification, which may comprise one of encoding a terminal identifier in the beacon signal and using a transmission code for the beacon signal transmission.

IS it is to be noted that the sequence of individual operations and the partitioning thereof as illustrated in Figures 2 and 3 merely represents a non-limiting example only. Other sequences of the individual operations and partitionings thereof; as conceivable by a skilled person, also fall within the scope of the present invention and exemplary embodiments thereof For example, referring to the procedure of Figure 2, the operation 215 may also be performed after any one of operations 220, 230 and 235, the operation 235 may also be performed before any one of operations 210, 215, 220 and 230. Further, referring to the procedure of Figure 3, the operation 315 may be an integrated part of the operation 310.

Figure 4 is a signaling diagram illustrating various procedures according to exemplary embodiments of the present invention. Namely, three procedures are shown in Figure 4 (being separated by small oblique double lines), which are mutually independent, and which thus could be carried out separately or in combination. The illustration of these procedures in a single diagram is for the sake of convenience and by way of example only.

All of the procedures according to Figure 4 assume that the aforementioned processes of beacon signal transmission and data storage are completed. That is, in short, the liE has sent its beacon signal, the eNB has performed respective measurements and/or determinations and the resulting data have been stored in the DB (as has that for other eNBs in the vicinity of the UE).

As shown in Figure 4, in one procedure according to exemplary embodiments of the present invention, the eNB (e.g. the serving eNB) reads stored data (including radio path characteristics and timing value and, potentially, processing load) for one or more (other) eNBs (e.g. non-serving (target) eNBs) from the DB, and utilizes the thus read data accordingly. Then, the eNB sends or reports conesponding measurement reports (of its own and!or the eNB(s) for which the data has been read from the DB) and/or utilization reports (i.e. the results of utilization of respective data at the eNB) to the liE. The tiE then utilizes the received measuremcnt/utilization report(s) accordingly.

For example, based on radio path characteristics and timing values of other eNB(s), the eNB may make a handover decision for the UE, and the tiE may utilize IS the reported result thereof for performing a conesponding handover, or the eNB may initiate and/or execute a handover procedure for the UE, and the tiE may utilize the reported result thereof for executing and/or completing a corresponding handover procedure, or the eNB may perform control of measurement and/or reporting requirements for the UE, and the tiE may then utilize the reported control command thereof for performing measurement and/or reporting in accordance with the commanded measurement and/or reporting requirements. For example, based on processing loads of other eNB(s), the eNB may adjust the results to be reported to the tiE, and the UE may then utilize the thus adjusted results for making a (autonomous) reselection decision.

As shown in Figure 4, in one procedure according to exemplary embodiments of the present invention, the eNB (e.g. the serving eNB) reads stored data (in particular, a timing value) for one (other) eNB (e.g. non-serving (target) eNB) from the DB, and utilizes the thus read data for calculating an UL timing (UL Timing Advance (TA)) between the UE and the (other) eNB. For UL TA calculation, the eNB may consider the read timing value (or a difference of the read timing value and its own timing value) and a DL timing difference between the (other) eNB and its own.

For details in this regard, reference is made to Figure 5 below. Then, the calculated IlL TA is reported from the eNB to the UE, and the liE then applies the reported UL TA accordingly.

As such, an Ut TA calculation at the eNB is applicable when the network (i.e. S the eNBs thereof) is synchronized, in which case a corresponding indication of a synchronization of the network may also be reported to the UE, so that the liE knows that the provided uplink timing is based on a synchronized network and, thus, does not need to be further adjusted/corrected at the UE.

As shown in Figurc 4, in one procedure according to exemplary embodiments of the present invention, the eNB (e.g. the non-serving (target) eNB) reports its own timing value as previously determined (which could be locally available or be read from the DB) to the UE. Then, the liE calculates an UL timing (IlL TA) between the lIE and the eNB. For UL TA calculation, the UE may consider the received timing value and a DL timing difference between the eNB and its serving eNB. For details in IS this regard, reference is made to Figure 5 below. Then, the liE applies the calculated UL TA accordingly.

As such, an UL TA calculation at the UE is applicable when the network (i.e. the eNBs thereof) is non-synchronized, in which case a corresponding indication of a non-synchronization of the network may also be reported to the liE, so that the UE knows that the provided uplink timing is based on a non-synchronized network and, thus, needs to be further adjusted/corrected at the lIE.

Figure 5 shows a schematic diagram illustrating a system-related overview relating to uplink timing calculation according to exemplary embodiments of the present invention.

As shown in Figure 5, an exemplary scenario according to exemplary embodiments of the present invention assumes that a serving base station eNB A and a non-serving (potential target) base station eNB B are linked with the lIE in terms of monitoring and processing of the liE-transmitted beacon signal. After the timing values (TA) of both eNBs have been stored at the DB, the serving eNB A reads out the TA of the non-serving eNB B (with respect to the UE in question), utilizes cNB B's TA for UL TA calculation, utilizes the available data for making a handover decision, and issues a handovcr command including the thus calculated IJL timing information to the UE.

Assuming that the network is synchronized, the network (e.g. eNB A) can calculate the uplink timing for the UE as foflows.

S In case the beacon signal is for example a random access burst sent from the TJE, the timing is calculated based on a beacon signa' sent without uplink timing on the serving base station. That is, if the liE sends the beacon signal without any timing advance (for example, by way of a random access burst), the uplink timing can be calculated directly from thc bcacon signal received at a rcspcctivc base station.

In such a case, the network (e.g. eNB A) can calculate the uplink timing for the liE based on the timing value of the eNB B, i.e. a measured delay in the transmission of thc UE-transmitted beacon signal, and a DL timing difference between eNB B and eNB A. In view of the parameter denominations indicated in Figure 5, this can be expressed as follows:

IS

liE TA (eNB B) = ADLTiming -TACNB B,wherein DLTiming = eNB B (timing) -eNB A (timing).

In case the beacon signal is for example a SRS sent from the UE, the timing is calculated based on a beacon signal sent with uplink timing on the serving base station. That is, if the UE sends the beacon signal with a timing advance, i.e. the beacon signal is sent based on the serving base station's uplink timing (for example, by way of a SRS), the uplink timing between the liE and a non-serving base station can be calculated with the knowledge of a timing between the UE and the serving base station, wherein the TIE uplink timing for the serving base station can be read from the DB.

In such a case, the network (e.g. eNB A) can calculate the uplink timing for the UB based on a difference between the timing values of eNB B and eNB A, i.e. the measured delays in the transmission of the liE-transmitted beacon signal or a difference between the serving cell and a target cell uplink timing advance, and a DL timing difference between eNB B and eNB A. In view of the parameter denominations indicated in Figure 5, this can be expressed as follows: TIE TA (eNB B) = ADLTiming -ATA, wherein ATA = TAeNB B -TANn A, and DLTiming = eNB B (timing) -eNB A (timing).

In view of the above, in order for base stations to be able to (reliably) calculate the uplink timing for the liE, the network base stations need to be synchronized with respect to one other. As the possible time difference between the base stations is known, the network can calculate the uplink timing advance between the UE and the base stations in consideration thereof.

Assuming that the network is not synchronized, the uplinic timing for the UE can only be (reliably) calculated at the liE.

In such a case, the TIE can calculate the uplink timing for the tiE based on a timing difference between the serving base station and the other (non-serving) base station, i.e. DLTiming. When knowing that the given timing advance for the other base station (as provided by way of a corresponding report) is calculated from a non-synchronized network (e.g. by virtue of a corresponding indication, as indicated above), the UE knows that there is a need for adjustment/correction thereof. To this end, the TIE may adjust/correct the given timing advance with the DL timing difference of the serving base station and the other base station, which is locally available at (he TIE (e.g. as a result of corresponding measurements).

In view of the above, the following effects can be achieved by exemplary embodiments of the present invention, for example. Further effects of exemplary embodiments of the present invention will be readily evident for a skilled person from

the detailed description.

Firstly, measurements relating to a radio path between a terminal and one or more base stations (such as those required for mobility decisions or the like) are effected at the network side, namely based on a terminal-transmitted beacon signal. In this way, the measurements and reporting required from the terminal can be reduced or even eliminated, thus providing improvements in terms of resource consumption and terminal power consumption as well as latency or delay in the context of ceflular radio path measurement and reporting.

Secondly, an uplink timing between the UIE and monitoring base stations is measured. In this way, when such uplirik timing is reported e.g. in connection with a handover command, a handover can be made without the need for separate uplink timing adjustment during the handover process. Accordingly, a faster handover procedure is enabled by way of a predetermined uplink timing.

Further, a faster mobility (e.g. handovcr) decision is made on the network side, since required measurements are performed by the network and latest measurement results are immediately available at the network (without the need of respective reports from the terminal).

I 5 Further still, less traffic is present on the radio path (i.e. the air interface), in particular when an existing beacon signal is used (such as SRS), as the terminal does not need to send measurement results to the network.

In addition the network has more information available for making certain decisions and/or performing certain controls. As a result the network can for example influence on reselection decisions by selecting the result(s) to be reported to the terminal. Thereby, the network is capable of adjusting load more efficiently, and the terminal is capable of making more intelligent (autonomous) reselection decisions with more informative measurement results reported from the network.

Furthcr, no further specifications arc to be standardized for bcacon signal transmission and terminal measurement rules.

The above-described procedures and functions may be implemented by respective functional elements, processors, or the like, as described below.

While in the foregoing exemplary embodiments of the present invention are described mainly with reference to methods, procedures and functions, corresponding exemplary embodiments of the present invention also cover respective apparatuses, network nodes and systems, including both software and/or hardware thereof.

Respective exemplary embodiments of the present invention are described below referring to Figure 6, while for the sake of brevity reference is made to the detailed description of respective corresponding methods and operations according to Figures 1 to 5.

S In Figure 6 below, which is noted to represent a simplified block diagram, the solid line blocks indicate parts that are configured to perform respective operations as described above. More particularly, the individual blocks are meant to illustrate respective functional blocks implementing a respective function, process or procedure, respectively. Such functional blocks are implementation-independent, i.e. may be implemented by means of any kind of hardware or software, respectively. The arrows and lines interconnecting individual blocks are meant to illustrate an operational coupling there-between, which may bc a physical and/or logical coupling, which on the one hand is implementation-independent (e.g. wired or wireless) and on the other hand may also comprise an arbitrary number of intermediary functional IS entities not shown. The direction of arrow is meant to illustrate the direction in which certain operations are performed and/or the direction in which certain data is transferred.

Further, in Figure 6, only those functional blocks are illustrated, which relate to any one of the above-described methods, procedures and functions. A skilled person will acknowledge the presence of any other conventional functional blocks required for an operation of rcspcctivc structural arrangcmcnts, such as e.g. a power supply, a central processing unit, respective memories or the like. Among others, memories arc provided for storing programs or program instructions for controlling the individual functional entities to operate as dcscribed herein.

In view of the above, the thus described apparatuses 10, 20 and 30 are suitable for use in practicing the exemplary embodiments of the present invention, as described herein. The thus described apparatus 10 may represent a (part of a) network entity, i.e. base station or access node, such as for example a NodeB, an eNB, or the like, as described above, and may be configured to perform a procedure and/or exhibit a functionality as described in conjunction with any one of Figures 1,2,4 and 5. The thus described apparatus 20 may represent a (part of a) terminal or user equipment UE, as described above, and may be configured to perform a procedure and/or exhibit a functionality as described in conjunction with any one of Figures 1, 3, 4 and 5. The thus described apparatus 30 may represent a (part of a) network-based database or data storage, as described above, which may for example be located at a controHer entity such as a RNC or the like, and may be configured to perform a procedure and/or exhibit a functionality as described in conjunction with any one of Figures 1, 4 and 5.

As shown in Figure 6, according to exemplary embodiments of the present invention, a base station 10 comprises a processor II, a memory 12, and an interface 13, which are connected by a bus 14 or the like, a terminal or user equipment 20 compriscs a processor 21, a memory 22, and an interface 23, which arc connected by a bus 24 or thc like. The terminal or uscr cquipmcnt 20 may be conncctcd with the base station 10 through a link or connection 40, and the base station 10 may be connected with the database 30 through a link or connection 50.

IS The memories 12 and 22 may store respective programs assumed to include program instructions or computer program code that, when executed by the associated processors 11 and 21, enable the respective electronic device or apparatus to operate in accordance with the exemplary embodiments of the present invention.

The processors 11 and 21 and/or the interfaces 13 and 23 may also include a modem or the like to facilitate communication over a (hardwire or wireless) link, respectively. The interfaces 13 and 23 may include a suitable transceiver coupled to one or more antennas or communication means for (hardwire or wireless) communications with the linked or connected device(s), respectively. The interfaces 13 and 23 are generally configured to communicate with another apparatus, i.e. the interface thereof. For example, the interface I 3 of the network entity I 0 may communicate with another network entity (not shown) storing the database 30.

In general terms, the respective devices/apparatuses (and/or parts thereof) may represent means for performing respective operations and/or exhibiting respective functionalities, and/or the respective devices (and/or parts thereof) may have functions for performing respective operations and/or exhibiting respective functionalities.

When in the subsequent description it is stated that the processor (or some other means) is configured to perform some function, this is to be construed to be equivalent to a description stating that at least one processor, potentially in cooperation with computer program code stored in the memory of the respcctive apparatus, is configured to cause the apparatus to perform at least the thus mentioned function. Also, such function is to be construed to be equivalently implcmcntable by specifically configured means for performing the respective function (i.e. the expression "processor configured to [cause the apparatus tol xxx" is construed to be cquivalcnt to an expression such as "mcans for xxx-ing").

According to exemplary embodiments of the present invention, an apparatus representing the base station 10 comprises at least one processor 11, at least one memory 12 including computer program code, and at least onc intcrfacc 13 configured for communication with at least another apparatus. The at least one processor 11, with the at least one memory 1 2 and the computer program code, is IS configured to cause the apparatus 10 to perform: monitoring transmission of a beacon signal from a terminal 20, measuring characteristics of a radio path towards the terminal 20 based on a received beacon signal from the terminal 20, determining a timing value of the received beacon signal from the terminal 20, and initiating storage of the measured characteristics and the determined timing value as data with respect to the terminal 20 in a network-based database 30.

According to exemplary cmbodiments of the present invcntion, the at least one processor 11, with the at least one memory 12 and the computer program code, may be further configured to cause the apparatus to perform: reading at least one of the stored data with respect to the terminal for one or more of said base stations from the network-based database, and utilizing the reading result for at least one of making a handover decision for the tenriinal, initiating and/or executing a handover procedure for the terminal, controlling measurement and/or reporting requirements for the terminal, reporting the reading results to the terminal, and adjusting the reading results to be reported to the terminal.

According to exemplary embodiments of the present invention, the at least one processor 11, with the at least one memory 12 and the computer program code, may be further configured to cause the apparatus to perform: reading a determined timing value with respect to the terminal for one of said base stations from the network-based database, calculating an uplink timing between the terminal and said one of said base stations based on the read timing value and a downlink timing difference between said one of said base stations and a base station currently serving the terminal, and reporting the calculated uplink timing together with an indication of a synchronization of the network to the terminal.

According to exemplary embodiments of the present invention, the at least one processor 11, with the at icast one memory 12 and the computer program code, may be further configured to cause the apparatus to perform: reporting the determined timing value together with an indication of a non-synchronization of the network to the terminal.

According to exemplary embodiments of the present invention, the at least one processor 11, with the at least one memory 12 and the computer program code, may I 5 be further configured to cause the apparatns to perform at least one of: identiring the terminal using one of a terminal identifier encoded in the received beacon signal and a transmission code used for the beacon signal transmission, and determining a processing load and initiating storage of the determined processing load as data with respect to the terminal in the network-based database.

According to exemplary embodiments of the present invention, an apparatus reprcscnting the terminal 20 comprises at least one processor 21, at least one memory 22 including computer program code, and at least one interface 23 configured for communication with at least another apparatus. The at least one processor 21, with the at least one memory and the computer program code, is configured to cause the apparatus 20 to perform: initiating transmission of a beacon signal of the terminal 20 towards at least one base station 1 0 in a coverage area in which the terminal 20 resides, and receiving a result of measurements relating to at least one of a radio path and a timing between the terminal 30 and the one or more of said base stations 10 from a base station 10 which is currently serving the terminal.

According to exemplary embodiments of the present invention, the at least one processor 21, with the at least one memory 22 and the computer program code, may be further configured to cause the apparatus to perform utilizing the received result of measurements for at least one of performing the handover, executing and/or completing the handover procedure, performing measurement and/or reporting in accordance with the measurement andior reporting requirements, and making a reselection decision.

According to exemplary embodiments of the present invention, the at least one processor 21, with the at least one memory 22 and the computer program code, may be further configured to cause the apparatus to perform at least one of receiving a calculated uplink timing between the terminal and one of said base stations together with an indication of a synchronization of the network from the base station currently serving the terminal, and applying the received uplink timing, and receiving a timing value of a beacon signal receipt at one of said base stations together with an indication of a non-synchronization of the network from the base station currently serving the terminal, calculating an uplink timing between the terminal and said one of said base IS stations based on the received timing value and a downlink timing difference between said one of said base stations and the base station currently serving the terminal, and applying the calculated uplink timing.

According to exemplary embodiments of the present invention, the at least one processor 21, with the at least one memory 22 and the computer program code, is further configured to cause the apparatus to perform providing terminal identification by one of encoding a terminal identifier in the beacon signal and using a transmission code for the beacon signal transmission.

According to exemplarily embodiments of the present invention, the processor 11 or 2!, the memory 12 or 22 and the interface 13 or 23 can be implemented as individual modules, chipsets or the like, or one or more of them can be implemented as a common module, ehipset or the like, respectively.

According to exemplarily embodiments of the present invention, a system may comprise any conceivable combination of the thus depicted devices/apparatuses and other network elements, which are configured to cooperate as described above.

In general, it is to be noted that respective functional blocks or elements according to above-described aspects can be implemented by any known means, either in hardware and/or software, respectively, if it is only adapted to perform the described functions of the respective parts. The mentioned method steps can be realized in individual functional blocks or by individual devices, or one or more of the method steps can be realized in a single functional block or by a single device.

Generally, any method step is suitable to be implemented as software or by hardware without changing the idea of the present invention. Such software may be software code independent and can be specified using any known or friture developed programming language, such as e.g. Java, C++, C, and Assembler, as long as the functionality defined by the method steps is preserved. Such hardware may be hardware type independent and can be implemented using any known or future developed hardware technology or any hybrids of these, such as MOS (Metal Oxide Semiconductor), CMOS (Complementary MOS), BiMOS (Bipolar lvIOS), BiCMOS (Bipolar CMOS), ECL (Emitter Coupled Logic), TTL (Transistor-Transistor Logic), etc., using for example ASIC (Application Specific IC (Integrated Circuit)) I 5 components, FPGA (Field-programmable Gate Arrays) components, CPLD (Complex Programmable Logic Device) components or DSP (Digital Signal Processor) components. A device/apparatus may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of a device/apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor. A device may be regarded as a device/apparatus or as an assembly of more than one device/apparatus, whether functionally in cooperation with each other or flinctionafly independently of each other but in a same device housing, for example.

Devices and means can be implemented as individual devices, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device is preserved. Such and similar principles are to be considered as known to a skilled person.

Software in the sense of the present description comprises software code as such comprising code means or portions or a computer program or a computer program product for performing the respective functions, as well as software (or a computer program or a computer program product) embodied on a tangible medium such as a computer-readable (storage) medium having stored thereon a respective data structure or code means/portions or embodied in a signal or in a chip, potentiafly during processing thereof.

The present invention also covers any conceivable combination of method steps and operations described above, and any conceivable combination of nodes, apparatuses, modules or elements described above, as long as the above-described concepts of methodology and structural arrangement arc applicable.

In view of the above, the present invention and/or exemplary embodiments thereof provide methods and apparatus for cellular radio path measurement and reporting. Such methods may exemplarily comprise, by a terminal, initiating transmission of a beacon signal of the terminal towards base stations in a coverage area in which the terminal resides, and, by a base station, monitoring transmission of IS the beacon signal from the terminal, measuring characteristics of a radio path towards the terminal based on a received beacon signal from the terminal, determining a timing value of the received beacon signal from the terminal, and initiating storage of the measured characteristics and the determined timing value as data with respect to the terminal in a network-based database being common for base stations in a coverage area in which the terminal resides.

Even though the present invention and/or exemplary embodiments are described above with reference to the examples according to the accompanying drawings, it is to be understood that they are not restricted thereto. Rather, it is apparent to those skilled in the art that the present invention can be modified in many ways without departing from the scope of the inventive idea as disclosed herein.

List of acronyms and abbreviations CDMA Code Division Multiple Access C-RNTI Cell Radio Network Temporary Identifier DL Downlink eNB evolved NodeB LTE Long Term Evolution RNC Radio Network Controller RNTI Radio Network Temporary Identifier SRS Sounding Reference Signal TA Timing Advance UE User Equipment UL Uplink

Claims

<claim-text>Claims: 1. A method of conducting cellular radio path measurement and reporting, the method comprising: monitoring iransmission of a beacon signal fix,m a terminal, measuring characteristics of a radio path towards the terminal based on a received beacon signal from the terminal, determining a timing value of the received beacon signal from the terminal, and initiating storage of data indicative of the measured characteristics and the determincd timing value with respect to the terminal in a network-based database, the network-based database being common for base stations in a coverage area in which the terminal resides.</claim-text> <claim-text>(5
2. The method according to claim 1, fUrther comprising: reading at least one item of the stored data with respect to the terminal for one or more of said base stations from the network-based database, and utilizing the reading result for at least one of making a handover decision for the terminal, initiating and/or executing a handover procedure for the terminal, controlling measurement and/or reporting requirements for the terminal, reporting the reading results to the terminal, and adjusting the reading results to be reported to the terminal.</claim-text> <claim-text>3. The method according to claim 1 or 2, further comprising: reading a determined timing value with respect to the terminal for one of said base stations from the network-based database, calculating an uplink timing between the terminal and said one of said base stations based on the read timing value and a downlink timing difference between said one of said base stations and a base station currently serving the terminal, and reporting the calculated uplink timing together with an indication of a synchronization of the network to the terminal.</claim-text> <claim-text>4. The method according to claim I or 2, further comprising reporting the determined timing value together with an indication of a non-synchronization of the network to the terminal.</claim-text> <claim-text>5. The method according to any one of claims I to 4, further comprising at least one of: identifying the terminal using one of a terminal identifier encoded in the received beacon signal and a transmission code used for the beacon signal transmission, and determining a processing load and initiating storage of the determined processing load as data with respect to the terminal in the network-based database.</claim-text> <claim-text>6. The method according to any one of claims I to 5, in which the beacon signal IS comprises one of a sounding reference symbol and a transmission burst in a dedicated random access channel, the method being operable at or by a base station of a cellular communication system, wherein the storage in the network-based database is initiated with respect to the base station.</claim-text> <claim-text>7. A method of conducting cellular radio path measurement and reporting, the method comprising: initiating transmission of a beacon signal of a terminal towards base stations in a coverage area in which the terminal resides, and receiving a result of measurements relating to at least one of a radio path and a timing between the terminal and one or more of said base stations from a base station currently serving the terminal.</claim-text> <claim-text>8. The method according to claim 7, in which the received result of measurements comprises at least one of a result of a handover decision for the terminal, an initiation and/or executLon resuli of a handover procedure for the terminal, a control command for measurement and/or reporting requirements for the terminal, and a report of at least one of data stored with respect to the terminal for one or more of said base stations in a network-based database, and the method further comprises utilizing the received result of measurements for at least one of performing the handover, executing and/or completing the handover procedure, performing measurement and/or reporting in accordance with the measurement and/or reporting requirements, and making a reseleetion decision.</claim-text> <claim-text>9. The method according to claim 7 or 8, further comprising at least one of: receiving a calculated uplink timing between the terminal and one of said base stations together with an indication of a synchronization of the network from the base station currcntly serving the terminal, and applying thc received uplink timing, and receiving a timing value of a beacon signal receipt at one of said base stations together with an indication of a non-synchronization of the network from the base IS station currently serving the terminal, calculating an uplink timing between the terminal and said one of said base stations based on the received timing value and a downlink timing difference between said one of said base stations and the base station currently serving the terminal, and applying the calculated uplink timing.</claim-text> <claim-text>10. The method according to any one of claims 7 to 9, in which the beacon signal comprises one of a sounding rcfcrcncc symbol and a transmission burst in a dedicated random access channel, and in which the method further comprises providing terminal identification by onc of encoding a terminal identifier in the beacon signal and using a transmission code for the beacon signal transmission, the method being operable at or by the terminal, and the base stations are base stations of a cellular communication system.</claim-text> <claim-text>11. An apparatus for conducting cellular radio path measurement and reporting, the apparatus comprising a processing system arranged to cause the apparatus to: monitor transmission of a beacon signal from a terminal, measure characteristics of a radio path towards the terminal based on a received beacon signal from the terminal, determine a timing value of the received beacon signal from the terminal, and initiate storage of data indicative of the measured characteristics and the determined timing value with respect to the terminal in a network-based database, the network-based database being common for base stations in a coverage area in which the terminal resides.</claim-text> <claim-text>12. The apparatus according to claim II, whercin the processing system is arranged to cause the apparatus to: rcad at least one item of the stored data with respect to the terminal for one or more of said basc stations from the network-bascd database, and utilize the reading result for at least one of making a handover decision for the terminal, initiating and/or executing a handover procedure for the terminal, IS controlling measurement and/or reporting requirements for the terminal, reporting the reading results to the terminal, and adjusting the reading results to be reported to the terminal.</claim-text> <claim-text>13. The apparatus according to claim 11 or 12, wherein the processing system is arranged to cause the apparatus to: read a determined timing value with respect to the terminal for one of said base stations from the network-based database, calculate an uplink timing between the terminal and said one of said base stations based on the read timing value and a downlink timing difference between said one of said base stations and a base station currently serving the terminal, and report the calculated uplink timing together with an indication of a synchronization of the network to the terminal.</claim-text> <claim-text>14. The apparatus according to claim 11 or 12, wherein the processing system is further arranged to cause the apparatus to report the determined timing value together with an indication of a non-synchronization of the network to the terminal.</claim-text> <claim-text>15. The apparatus according to any one of claims 11 to 14, wherein the processing system is further arranged to cause the apparatus to: identify the terminal using one of a terminal identifier encoded in the received beacon signal and a transmission code used for the beacon signal transmission, and determine a processing load and initiating storage of the determined processing load as data with respect to the terminal in the network-based database.</claim-text> <claim-text>16. The apparatus according to any one of claims 11 to 15, wherein the beacon signal comprises one of a sounding reference symbol and a transmission burst in a dedicated random access channel, and thc apparatus is operable as or at a base station of a cellular communication system, wherein the processing system is further arranged to cause the apparatus to perform initiating the storage in the network-based database with respect to the base IS station.</claim-text> <claim-text>17. An apparatus for conducting cellular radio path measurement and reporting, the apparatus comprising a processing system arranged to cause the apparatus to: initiate transmission of a beacon signal of a terminal towards base stations in a coverage area in which the terminal resides, and receive a result of measurements relating to at least one of a radio path and a timing between the terminal and one or more of said base stations from a base station currently serving the terminal.</claim-text> <claim-text>18. The apparatus according to claim I?, wherein the received result of measurements comprises at least one of a result of a handover decision for the terminal, an initiation and/or execution result of a handover procedure for the terminal, a control command for measurement and/or reporting requirements for the terminal, and a report of at least one of data stored with respect to the terminal for one or more of said base stations in a network-based database, and the processing system is arranged to cause the apparatus to utilize the received result of measurements for at least one of performing the handover, executing and/or completing the handover procedure, performing measurement and/or reporting in accordance with the measurement andior reporting requirements, and making a reselection decision.</claim-text> <claim-text>19. The apparatus according to claim 17 or 18, whcrcin the processing system is arranged to cause the apparatus to perform at least one of: receiving a calculated uplink timing between thc terminal and one of said base stations together with an indication of a synchronization of the network from the base station currently serving the terminal, and applying the received uplink timing, and receiving a timing value of a beacon signal receipt at one of said base stations together with an indication of a non-synchronization of the network from the base station currently serving the terminal, calculating an uplink timing between the IS terminal and said one of said base stations based on the received timing value and a downlink timing difference between said one of said base stations and the base station currently serving the terminal, and applying the calculated uplink timing.</claim-text> <claim-text>20. The apparatus according to any one of claims 17 to 19, wherein the beacon signal comprises one of a sounding reference symbol and a transmission burst in a dedicated random access channel, the processing system being arranged to cause the apparatus to perform providing terminal identification by one of encoding a terminal identifier in the beacon signal and using a transmission code for the beacon signal transmission, wherein the apparatus is operable as or at the terminal, and the base stations are base stations of a cellular communication system.</claim-text> <claim-text>21. A computer program product comprising a set of instructions, which, when executed by a computing device, is configured to cause the computing device to carry out the method according to any one of claims 1 to 6.</claim-text> <claim-text>22. The computer program product according to claim 21, embodied as a computer-readable storage medium.</claim-text> <claim-text>23. A computer program product comprising a set of instructions, which, when executed by a computing device, is configured to cause the computing device to carry out the method according to any one of claims 7 to 10.</claim-text> <claim-text>24. The computer program product according to claim 23, embodied as a computer-readable storage medium.</claim-text>