Patent Publication Number: US-10791194-B2

Title: Caching in wireless communication networks

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of application Ser. No. 14/353,765, filed Aug. 14, 2014, which is a National stage of International Application No. PCT/EP2011/068823, filed Oct. 27, 2011, which are all hereby incorporated by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to caching in cellular communication networks and in particular to client caching architecture and interfaces. 
     BACKGROUND ART 
     Today&#39;s cellular networks for wireless communication are required to support a large variety of different forms of communications. Some examples of communications typically taking place in a communication network is voice calls, video calls, transfer of small and large data files, streaming of audio and video and so on. In addition to the various forms of communications, the communications take place at different times during the day and night. This leads to a highly fluctuating traffic volume during the day and night hours. Still further, the traffic volume also differs from one cell to the other. When planning and designing capacity in a cellular network, the different peaks of traffic volume or load in the different cells in the network are taken into account in order to provide a reliable communication network that will to a large extent provide its customers with requested communication services to all the customers in each cell, also during peak hour traffic. 
     Since the communication networks are designed to provide or support requested communication services to all the customers in each cell, also during peak hour traffic, substantial capacity exists which remains unused during off-peak hours. During off-peak hours, the traffic volume or load is smaller, which means that the capacity which remains unused is wasted. 
     In order to smooth out the traffic volume or load over time, the radio network can control caching of data information communication which need not be delivered in real-time. 
     One approach for controlling the traffic volume or load is to virtually partition a storage of the client or user equipment such that at least one partition of the storage of the client or user equipment is owned by the operator of the wireless communication network. Such a solution implies that the network operator has access to the specific partition and the end-user, i.e. the user of the user equipment, cannot access it, while the operator is in control of the caching of data information in the user equipment using the specific partition. 
     Another approach is to download the data information to a storage or cache in the application layer at the network. 
     The above approaches suffer from several drawbacks. In the first solution, the user of the user equipment has to “give up” a partition of his/her storage capacity to the operator and the user will not be in control over this partition. In the second solution, the downloading to the storage or cache in the application layer may take place at an undesirable point in time when the radio conditions are unfavourable or the network load is already high. 
     SUMMARY 
     It is an object of the solution described herein to address at least some of the problems outlined above. In particular, it is an object to provide a Network Reporting Entity, NRE, and a User Equipment, UE, as well as a respective method therein for use in a wireless communication network for enabling controlling data transfer between the UE and a network cache, wherein the NRE is adapted to communicate with a Network Conditions Information Entity, NCIE. These objects and others may be obtained by providing a NRE and a UE and a method in a NRE and a UE according to the independent claims attached below. 
     According to an aspect a method in a NRE for use in a wireless communication network for enabling controlling data transfer between a first UE and a network cache, the NRE being adapted to communicate with a Network Conditions Information Entity, NCIE is provided. The method comprises receiving, from the first UE, a request to start reporting network status. The method further comprises transmitting, to the first UE, information regarding the status of the network, the information pertaining to whether network condition is in a state where a data transfer is preferred or not, wherein the NRE obtains the information regarding the status of the network from the NCIE. In this manner, the first UE is enabled to control the data transfer between the UE and the network cache. 
     According to an aspect, a method in a UE for controlling data transfer between the UE and a network cache in a wireless communication network is provided. The method comprises requesting, from a NRE, a report regarding the status of the wireless communication network. The method further comprises receiving, from the NRE, the report regarding the status of the wireless communication network and determining whether to initiate data transfer between the UE and the network cache based on the received status report of the wireless communication network. 
     According to an aspect, a NRE for use in a wireless communication network, the NRE being adapted to enable controlling data transfer between a first UE and a network cache, the NRE being adapted to communicate with a NCIE is provided. The NRE comprises a receiving unit adapted to receive a request from the first UE requesting starting to report network status information to the first UE. The NRE further comprises a transmitting unit adapted to transmit, to the first UE, information regarding the status of the network. The information pertains to whether the network condition is in a state where a data transfer is preferred or not, wherein the NRE obtains the information regarding the status of the network from the NCIE. In this manner, the first UE is enabled to control the data transfer between the UE and the network cache. 
     According to an aspect, a UE adapted to control data transfer between the UE and a network cache in a wireless communication network is provided. The UE comprises a requesting unit adapted to request a report regarding the status of the wireless communication network from a NRE; and a receiving unit adapted to receive the report regarding the status of the wireless communication network from the NRE. The UE further comprises a determining unit adapted to determine whether to initiate data transfer between the UE and the network cache based on the received status report of the wireless communication network. 
     The NRE, the UE and the respective method therein have several advantages. One advantage is that the NRE provides the UE with information such that the UE can initiate data transfer at the most favourable conditions regarding the load in the wireless communication network. It further enables the UE to decide whether to engage in data transfer with regards to both the network conditions and with regards to the need for the UE to engage in the data transfer. A further advantage is that traffic load can be smoothed out over time, meaning that the UE may, based on the information from the NRE, refrain from engaging in transferring data with the network cache during periods of high traffic load in the cell or in the wireless communication network and instead engage in transferring data with the network cache during periods of low traffic load in the cell or in the wireless communication network. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       Embodiments will now be described in more detail in relation to the accompanying drawings, in which: 
         FIG. 1 a    is a flowchart of a method in a network reporting entity according to an exemplifying embodiment. 
         FIG. 1 b    is a flowchart of a method in a network reporting entity according to an exemplifying embodiment. 
         FIG. 2 a    is a flowchart of a method in a user equipment according to an exemplifying embodiment. 
         FIG. 2 b    is a flowchart a method in a user equipment according to an exemplifying embodiment. 
         FIG. 3  is a block diagram of a network reporting entity according to an exemplifying embodiment. 
         FIG. 4  is a block diagram of a user equipment according to an exemplifying embodiment. 
         FIG. 5  is a schematic architecture overview of a system or network in which client controlled caching can be implemented, according to further possible embodiments. 
         FIG. 6  is a signalling diagram schematically illustrating a practical example of interaction between different nodes and entities for client controlled caching, when using the solution. 
         FIG. 7  is a signalling diagram schematically illustrating a practical example of interaction between different nodes and entities for client controlled caching, when using the solution. 
     
    
    
     DETAILED DESCRIPTION 
     Briefly described, exemplifying embodiments of a Network Reporting Entity, NRE, for use in a wireless communication network and a User Equipment, UE, and a respective method therein are provided for enabling controlling data transfer between a first UE and a network cache. By providing the UE with information regarding the current condition in the wireless communication network, the UE is enabled to make qualified decision whether to engage in data transfer or to refrain from engaging in data transfer between the UE and the network cache. 
     A wireless communication network typically comprises a plurality of radio base stations. A radio base station in use typically has a coverage area in which UEs being located are provided with services offered by the wireless communication network. The coverage area is also known as a cell. When a UE is being served by a radio base station, the radio base station is called the serving radio base station and the coverage area of the serving radio base station, i.e. the cell, is called the serving cell. 
     An exemplifying embodiment of a method in a NRE will now be described with reference to  FIG. 1 a   , which is a flowchart of such a method in a NRE for use in a wireless communication network for enabling controlling data transfer between a first UE and a network cache according to an exemplifying embodiment. The NRE is adapted to communicate with a Network Conditions Information Entity, NCIE. 
       FIG. 1 a    illustrates the method comprising receiving  110   a , from the first UE, a request to start reporting network status. The method further comprises transmitting  140   a , to the first UE, information regarding the status of the network, the information pertaining to whether network condition is in a state where a data transfer is preferred or not, wherein the NRE obtains the information regarding the status of the network from the NCIE. In this manner, the first UE is enabled to control the data transfer between the UE and the network cache. 
     The NRE obtains the information regarding the status of the network from the NCIE. The NCIE is e.g. a radio logic such a Radio Resource Management, RRM, entity or a Measuring Probe, MP, which is constantly updated with or constantly measures the current situation or condition of the wireless communication network and on the current situation or condition in the separate cells in the wireless communication network. The NCIE is in one example implemented in a Radio Network Controller, RNC, which controls at least one radio base station. The NRE is adapted to communication with at least one radio base station. 
     When the NRE receives  110   a  the request from the first UE, the NRE obtaining the information regarding the status of the network from the NCIE, the NRE then transmits  140   a  the information regarding the status of the network to the first UE which requested the information. The information informs the UE whether the network condition is in a state where a data transfer is preferred or not. Then the UE may, at least partly based on the received information, make a decision, i.e. control, the data transfer between the first UE and the network cache. 
     The method in the NRE has several advantages. One advantage is that the NRE provides the UE with information such that the UE can initiate data transfer at the most favourable conditions regarding the load in the wireless communication network. It further enables the UE to decide whether to engage in data transfer with regards to both the network conditions and with regards to the need for the UE to engage in the data transfer. A further advantage is that traffic load can be smoothed out over time, meaning that the UE may, based on the information from the NRE, refrain from engaging in transferring data with the network cache during periods of high traffic load in the cell or in the wireless communication network and instead engage in transferring data with the network cache during periods of low traffic load in the cell or in the wireless communication network. 
     According to an embodiment, the network status comprises information regarding at least one of start/stop sending, radio conditions, backhaul capacity, transport network load and traffic load within the cell in which the first UE is being served. 
     The network status information may pertain to the current situation or conditions in the serving cell, to the current situation or conditions in several cells and to the current situation or conditions in the network nodes being involved or affected by the data transfer between the first UE and the network cache. In one example, the traffic load of the serving cell is very high whereby the network condition is in a state where a data transfer is not preferred, as seen from the network side. In another example, the traffic load of the serving cell is low, but the backhaul capacity is very limited whereby the network condition is in a state where a data transfer is not preferred, as seen from the network side. In still an example, the traffic load of the serving cell is low and the backhaul capacity is high whereby the network condition is in a state where a data transfer is preferred, as seen from the network side. Another example of information which may be comprised in the status network report is Channel quality Index, CQI. 
       FIG. 1 b    is a flowchart of a method in a network reporting entity according to an exemplifying embodiment.  FIG. 1 b    illustrates the method comprising the corresponding steps  110   b  and  140   b  as compared to steps  110   a  and  140   a  in  FIG. 1   a.    
       FIG. 1 b    illustrates the embodiment of the method further comprising checking  115   b  if the NRE currently is receiving, from the NCIE, information regarding the status of the network in relation to the cell in which the first UE is being served when the NRE receives  110   b  the request to start reporting network status from the first UE. If this is the case then the method comprises transmitting  140   b  the received information regarding the status of the network to the first UE. 
     In this example, the NRE may or may not be receiving information regarding the status of the network in relation to the cell in which the first UE is being served from the NCIE. The NRE must then first check whether if it is currently receiving the information from the NCIE so that the NRE is able to transmit the requested information the first UE. In this example, the NRE is currently receiving information regarding the status of the network in relation to the cell in which the first UE is being served from the NCIE and may, consequently, transmit  140   b  the information regarding the status of the network to the first UE. 
       FIG. 1 b    also illustrates an example when the NRE is not currently receiving information regarding the status of the network in relation to the cell in which the first UE is being served from the NCIE. In this example, the method comprises checking  115   b  if the NRE currently is receiving, from the NCIE, information regarding the status of the network in relation to the cell in which the first UE is being served when the NRE receives  110   b  the request to start reporting network status from the first UE as described above. In this example, the check  115   b  results in the NRE detecting that it the NRE currently is not receiving, from the NCIE, information regarding the status of the network in relation to the cell in which the first UE is being served. Then method then comprises requesting  120   b , from the NCIE, information regarding the status of the network and receiving  130   b , from the NCIE, information regarding the status of the network. 
     In order for the NRE to transmit information regarding the status of the network in relation to the cell in which the first UE is being served to the first UE, the NRE must be in possession of the information in question. In this case, the NRE does not have the information that the first UE requests. Consequently, the NRE must first obtain the information before the NRE can transmit the information to the first UE. This is performed in steps  120   b  and  130   b  as illustrated in  FIG. 1   b.    
     According to an embodiment, the data transfer between the first UE and the network cache comprises uploading of information from the first UE to the network cache. 
     According to still an embodiment, the data transfer between the first UE and the network cache comprises downloading of information from the network cache to the first UE. 
     The. transfer of data, can comprise uploading information from the UE to the network cache and/or downloading information from the network cache to the UE. 
     Just as an example, a user of the UE wants to upload a set of pictures to a social network site, i.e. the network cache in this example. Assuming that many pictures is to be uploaded, the uploading may consume a substantial amount of capacity in either the cell by which the UE is being served or in the transport network between the UE and the network cache. Before initiating upload of the pictures to the social network site, the UE requests network status information in order to obtain knowledge of the current conditions in the network. In case the network conditions are such that it is not desirable from a network side of view, the UE may determine to postpone the upload to the social network site since the uploading of the pictures may not be time critical. Later in time, the UE receives network status information indicating a more favourable state, i.e. more favourable conditions in the network, the UE may decide to engage in uploading of the pictures to the social network site. 
     In another example, the user of the UE subscribes to a newspaper in such a way that e.g. once every 12 or every 24 hours the service provider of the newspaper issues an updated version of the newspaper to the network cache. The UE is in this example configured to download the newspaper from the network cache at appropriate time intervals. Before the UE engages in downloading of the newspaper from the network cache, the UE first requests network status information. Once the UE has received the network status information, the UE is enabled to determining, i.e. control, the downloading of the newspaper from the network cache to the UE at least partly based on the received network status information in the same manner as described above. 
     Again with reference to  FIG. 1 b   , according to an embodiment, the method further comprises receiving  150   b , from the first UE, a request to stop reporting network status information in relation to the cell in which the first UE is being served. The method also comprises checking  155   b  if the NRE is currently transmitting information regarding the status of the network to any further UE being served by the same cell as the first UE. If the NRE is not currently transmitting information regarding the status of the network to any further UE being served by the same cell as the first UE, then the method comprises requesting  160   b  the NCIE entity to stop reporting network status. 
     In one example, the NRE serves just one cell or radio base station, i.e. the cell in which the first UE is located and the NRE stops transmitting network status information to the first UE which requests to not receive any more network status information. However, there may be further UEs currently receiving network status information, the further UEs being located in the same cell as the first UE which just requested an end of receiving network status information. If there are further UEs in the same cell currently receiving network status information, then the NRE needs to still receive network status information from the NCIE in order to provide this information to the further UEs. If there are no further UEs in the cell in question, the NRE requests  160   b  the NCIE to stop reporting network status information. 
     Alternatively, if the NRE serves more than just one cell or radio base station, the NRE stops transmitting network status information to the first UE which requests to not receive any more network status information. However, the NRE may or may not request the NCIE to stop reporting network status information specifically relating to the cell in which the first UE is located, granted that the NRE is not transmitting network status information to any further UE in the cell in which the first UE is located. In any case, since the NRE is serving more than one cell in this example, the NRE may not request the NCIE to stop reporting network status information altogether as long as there is at least one UE in any of the cells which the NRE serves, which UE is still receiving network status information. The reason why the NRE may perhaps not request the NCIE to stop reporting network status information specifically relating to the cell in which the first UE is located, granted that the NRE is not transmitting network status information to any further UE in the cell in which the first UE is located, is that the network status information may comprise information pertaining to more than just the specific cell. Examples of that the network status information may comprise are given above. 
     Embodiments herein also relate to a method in a UE for controlling data transfer between the UE and a network cache in a wireless communication network. 
     Such a method in a UE will now be described with reference to  FIG. 2 a   , which is a flowchart a method in a network reporting entity according to an exemplifying embodiment. 
       FIG. 2 a    illustrates the method  200  in the UE comprising requesting  210 , from a Network Reporting Entity, NRE, a report regarding the status of the wireless communication network. The method further comprises receiving  220 , from the NRE, the report regarding the status of the wireless communication network and determining  225  whether to initiate data transfer between the UE and the network cache based on the received status report of the wireless communication network. 
     In this example, the UE has determined that a data transfer is to take place between the UE itself and the network cache. Before the UE determines whether to initiate the data transfer, the UE requires information pertaining to the status of the network. In order to obtain this information, the UE transmits a request for network status information to the NRE. Once the NRE has received the request, corresponding to step  110   a  and  11   b  in  FIGS. 1 a  and 1 b   , the NRE transmits the network status information to the UE in steps  140   a  and  140   b  as described above. Reverting to  FIG. 2 a   , the UE receives the network status information in a report from the NRE in step  220 . 
     Once the UE is in possession of the network status information, the UE determines  225  whether to initiate data transfer between the UE and the network cache based on the received status report of the wireless communication network. The UE may decide to engage in or initiate the data transfer, illustrated in  FIG. 2 a    by step  230 . The decision whether to initiate the data transfer between the UE and the network cache is at least partly based on the network information status. However, the UE may also consider other factors in conjunction with the network information status. The data transfer may be associated with a priority causing the UE to still initiate the data transfer even in case of somewhat unfavourable network conditions or status. 
     According to an embodiment, wherein the UE has initiated data transfer between the UE and the network cache, the method comprises receiving  240  a further report regarding the status of the wireless communication network from the NRE and determining  225  whether to uphold  230  or pause  250  the data transfer between the UE and the network cache based on the received further status report of the wireless communication network. 
     In this example, the UE has initiated the data transfer between the UE and the network cache. The data transfer comprises uploading of data information from the UE to the network cache and/or downloading of data information from the network cache to the UE. During this ongoing data transfer, the UE receives  240  a further report regarding the status of the wireless communication network from the NRE. The further report regarding the status of the wireless communication network may or may not indicate a change in conditions or status of the network. Based at least partly on the current situation according to the further received network status report, the UE determines whether to continue  230  the data transfer or to make a pause  250  of the data transfer. The decision may e.g. partly also be based on the amount of the remaining data to be transferred in the data transfer between the UE and the network cache and/or a priority assigned to the data to be transferred. 
     According to yet an embodiment, wherein the UE has paused  250  the data transfer between the UE and the network cache, the method comprising receiving  260  still a further report regarding the status of the wireless communication network from the NRE and determining  265  whether to resume  230  the data transfer between the UE and the network cache based on the received still further status report of the wireless communication network. 
     In this example, the UE has determined to pause  250  the data transfer between the UE and the network cache. This has been done as described above. The determination whether to pause or uphold the data transfer is illustrated in  FIG. 2 a    by step  245 . At some point in time after the UE has paused  250  the data transfer, the UE receives still a further network status report from the NRE. The network status report may indicate no change in network status or network conditions, or a change in network conditions for the better or for the worse. E.g. the traffic load in the cell may have increased or decreased, the backhaul capacity has increased or decreased. Depending on the current or latest network conditions, the UE determines whether to keep the data transfer paused, illustrated by steps  236  and  250  in  FIG. 2 a   ; or to resume the data transfer between the UE and the network cache, illustrated by steps  265  and  230  in  FIG. 2   a.    
       FIG. 2 b    is a flowchart a method in a UE according to an exemplifying embodiment. 
     According to the embodiment illustrated in  FIG. 2 b   , the method further comprises terminating  270  the data transfer between the UE and the network cache, and requesting  280  the NRE to stop reporting the status of the wireless communication network. 
     In this example, the UE and the network cache are transferring data, illustrated by step  230  in  FIG. 2 b   . This corresponds to the same step  230  in  FIG. 2 a   . The data transfer comprises uploading data from the UE to the network cache and/or downloading of data from the network cache to the UE. When the data transfer is completed, i.e. all the data that was supposed to be transferred has indeed been transferred, the UE terminates  270  the data transfer, i.e. the data transfer, between the UE and the network cache. In other words the UE stops uploading data to the network cache or stops downloading data from the network cache. When the data transfer is completed, the UE has no need of network status information and consequently sends  280  a request to the NRE to stop sending reports of the network status to the UE. 
     The reports regarding network status information may be sent from the NRE or the NCIE regularly, irregularly, continuously or on demand. Typically, the reports are sent regularly at a certain time interval. The time interval between two consecutive reports is e.g. configured in an Operation, Administration and Maintenance, OAM, system. The NCIE and/or the NRE then retrieves the time interval configuration from the OAM system. The time interval is configured in a manner such that it is long enough to avoid excessive signalling and short enough to provide accurate information regarding the status, or conditions, of the network. Furthermore, the NCIE may alternatively be configured to only send network status information to the NRE in case a predefined minimum change in status or conditions of the network occurs. Likewise the NRE may alternatively be configured to only send network status information to the UE in case a predefined minimum change in status or conditions of the network occurs. This is to avoid sending reports in case minor changes in the status or conditions in the network occur. In still another example, the change in status or conditions of the network occurs is weighted against a time period, meaning that the predefined minimum change in status or conditions of the network must occur during a predefined minimum duration in time, in order for the NRE  300  or the NCIE  350  to send a network status information report. 
     As described above, the status or conditions in the network comprises information regarding at least one of start/stop sending, radio conditions, backhaul capacity, transport network load and traffic load within the cell in which the first UE is being served. Further examples of information comprised in the status or conditions in the network are bitrate used by the UEs being served by a specific serving radio base station, volumes of data (in Mbytes) being transferred between serving radio base station and UEs being served by this radio base station. Further examples are transmission power being used by the radio base station and/or per the UEs being served by the radio base station. Still an example is CQI. 
     Embodiments herein also relates to a NRE for use in a wireless communication network, the NRE being adapted to enable controlling data transfer between a first UE and a network cache. The NRE is also adapted to communicate with a Network Conditions Information Entity, NCIE. 
     The NRE has the same advantages, objects and technical features as the method performed therein described above. Therefore, the NRE will only be described in brief in order to avoid unnecessary repetition. 
     Such a NRE will be described with reference to  FIG. 3 , which is a block diagram of a NRE  300  according to an exemplifying embodiment.  FIG. 3  illustrates the NRE  300  comprising a receiving unit  311  adapted to receive a request from the first UE  400  requesting starting to report network status information to the first UE  400 . The NRE  300  further comprises a transmitting unit  312  adapted to transmit, to the first UE  400 , information regarding the status of the network. The information pertains to whether the network condition is in a state where a data transfer is preferred or not, wherein the NRE  300  obtains the information regarding the status of the network from the NCIE  350 . In this manner, the first UE  400  is enabled to control the data transfer between the UE  400  and the network cache (not shown in  FIG. 3 ). 
     The NRE  300  has several advantages. One advantage is that the NRE provides the UE with information such that the UE can initiate data transfer at the most favourable conditions regarding the load in the wireless communication network. It further enables the UE to decide whether to engage in data transfer with regards to both the network conditions and with regards to the need for the UE to engage in the data transfer. A further advantage is that traffic load can be smoothed out over time, meaning that the UE may, based on the information from the NRE, refrain from engaging in data transfer with the network cache during periods of high traffic load in the cell or in the wireless communication network and instead engage in data transfer with the network cache during periods of low traffic load in the cell or in the wireless communication network. 
       FIG. 3  illustrates the NRE  300  comprising a Processing Unit  320  which in turn comprises dedicated units adapted to perform different tasks as will be described below. The NRE  300  further comprises a cache  330  or a memory which in an example is adapted to store at least the latest received network information status from the NCIE  350 . 
     According to an embodiment, the network status comprises information regarding at least one of start/stop sending, radio conditions, backhaul capacity, transport network load and traffic load within the cell in which the first UE  400  is being served. 
     According to yet an embodiment, the NRE  300  further comprises a checking unit  323  adapted to check if the NRE  300  currently is receiving information regarding the status of the network in relation to the cell in which the first UE  400  is being served from the NCIE  350  when the NRE  300  receives the request to start reporting network status information from the first UE  400 . If this is the case, the transmitting unit  312  is further adapted to transmit the received information regarding the status of the network to the first UE  400 . 
     According to still an embodiment, if the NRE  300  currently is not receiving information regarding the status of the network in relation to the cell in which the UE is being served from the NCIE  350 , the NRE  300  further comprises a requesting unit  321  adapted to request information regarding the status of the network from the NCIE  350 , wherein the receiving unit  311  is adapted to receive information regarding the status of the network from the NCIE  350 . 
     It shall be pointed out that the requesting unit  321  is adapted to request information regarding the status of the network from the NCIE  350  via the transmitting unit  312 . 
     According to an embodiment, the data transfer comprises uploading of information from the first UE  400  to the network cache. 
     According to an embodiment, the data transfer comprises downloading of information from the network cache to the first UE  400 . 
     According to yet an embodiment, the receiving unit  311  is further adapted to receive a request to stop reporting network status in relation to the cell in which the first UE  400  is being served from the first UE  400 . The checking unit  323  further is adapted to check if the NRE  300  is currently transmitting information regarding the status of the network to any further UE being served by the same cell as the first UE  400 . If the NRE  300  is not currently transmitting information regarding the status of the network to any further UE being served by the same cell as the first UE  400 , then the requesting unit  321  further is adapted to request the NCIE  350  entity to stop reporting network status. 
     The NRE  300  is in one example further adapted to calculate the best strategy for sending the reports regarding network status information to all UEs subscribing to the network status reports, i.e. all UEs having requested to receive network status reports. This is to best utilise network capacity. Few UEs is possibly the best strategy to have where the data is transferred as fast as possible. This will also enable saving battery capacity for the UEs to be in active status, i.e. being engaged in data transfer, as short time as possible. 
     In one example, the NRE  300  is further adapted to receive network status information reports from the NCIE  350  and, before sending network status information reports to all UEs subscribing to the reports, to modify the network status information based on the number of UEs subscribing to the reports. For example, the NCIE  350  sends a network status information report to the NRE  300  indicating a relatively low load or relatively favourable conditions of the wireless communication network. The NRE  300  determines that there is a relatively high number of UEs subscribing to the reports. The NRE  300  then modifies the network status report, according a predefined algorithm, such that the conditions of the wireless communication network are indicated to be somewhat less favourable in order to avoid a situation where all the UEs engage in data transfer causing the status or conditions of the wireless communication network to rapidly deteriorate, which in turn might cause all or most of the UEs to temporarily pause their respective data transfer. Alternatively, the NRE  300  sends the network status report to all the UEs subscribing to the reports indicating the status of the network as having been determined by the NCIE  350  but the NRE  300  also adds information indicating to all the UEs the number of UEs currently subscribing to the reports. In this manner, the UEs are enabled to individually determine whether or not to initiate, pause or resume data transfer. 
     Embodiments herein also relates to a UE adapted to control data transfer between the UE and a network cache in a wireless communication network. 
     The UE has the same advantages, objects and technical features as the method performed therein described above. Therefore, the UE will only be described in brief in order to avoid unnecessary repetition. 
     Such a UE will now be described with reference to  FIG. 4 , which is block diagram of a UE  400  according to an exemplifying embodiment. 
       FIG. 4  illustrates the UE  400  comprising a requesting unit  421  adapted to request a report regarding the status of the wireless communication network from a NRE  350 ; and a receiving unit  411  adapted to receive the report regarding the status of the wireless communication network from the NRE  300 . The UE  400  further comprises a determining unit  422  adapted to determine whether to initiate data transfer between the UE  400  and the network cache  500  based on the received status report of the wireless communication network. 
       FIG. 4  illustrates the UE  400  comprising a Processing Unit  420  which is turn comprises different units adapted to perform the different tasks of the UE.  FIG. 4  also illustrates the UE  400  comprising a cache  430  or memory. The cache or memory  430  is in one example adapted to be used for storing downloaded information from the network cache  500 . In case the UE  400  uploads data to the network cache  500 , the data that is uploaded is held in the cache or memory  430  of the UE  400 . 
     According to an embodiment, wherein the UE 400  has initiated data transfer between the UE  400  and the network cache  500 , the receiving unit  411  further is adapted to receive a further report regarding the status of the wireless communication network from the NRE  300 . The determining unit  422  further is adapted to determine whether to uphold or to pause the data transfer between the UE  400  and the network cache  500  based on the received further status report of the wireless communication network. 
     According to yet an embodiment, wherein the UE  400  has paused the data transfer between the UE  400  and the network cache  500 , the receiving unit  411  further is adapted to receive still a further report regarding the status of the wireless communication network from the NRE  300  and the determining unit  422  further is adapted to determine whether to resume the data transfer between the UE  400  and the network cache  500  based on the received still further status report of the wireless communication network. 
     According to still an embodiment, the determining unit  422  further is adapted to terminate the data transfer between the UE  400  and the network cache  500  and the requesting unit  421  further is adapted to request the NRE  300  to stop reporting the status of the wireless communication network. 
       FIG. 5  is a schematic architecture overview of a system or network in which client controlled caching can be implemented, according to further possible embodiments. 
       FIG. 5  illustrates the first UE  400  communicating with the NRE  300 . Since the communication network is a wireless or cellular communication network, the UE communicates directly with a radio base station, RBS,  510 . This means that when the UE  400  communicates with the NRE  300 , all communication messages or signals go via the RBS  510 . A wireless communication network can be said to comprise a radio access network, RAN, and a core network. The RAT typically comprises RBSs and Radio Network Controllers, RNCs, or radio Base Station Controllers, BSCs. The core network comprises a plurality of nodes, e.g. switching centres, home location registers or subsystems, gateways to other networks and so on. In one example, the NRE  300  is comprised in the RAN, e.g. as a standalone node or comprised in a RBS or a RNC/BSC. 
       FIG. 5  further illustrates the NRE  300  being able to communicate with the NCIE  350 . The NCIE  350  is e.g. a radio logic such a Radio Resource Management, RRM, entity or a Measuring Probe, MP, which is constantly updated with or constantly measures the current situation or condition of the wireless communication network and on the current situation or condition in the separate cells in the wireless communication network. The NCIE  350  is in one example comprised in the RAN, e.g. as a standalone node or comprised in a RBS or a RNC/BSC. 
       FIG. 5  further illustrates the UE  400  being able to communicate with the network cache  500 , i.e. uploading or downloading of data as described above. Also the communication between the UE  400  and the network cache  500  goes via the RBS  510 . The network cache  500  is in one example implemented in the RAN in the same manner as the NRE  300  and the NCIE  350 . In another example, the network cache  500  is implemented in the core network, either as a standalone node in the core network or incorporated into an already existing core network node. In still an example, the network cache  500  is implemented in a different network than the wireless communication network. In this latter example, the UE  400  communicates with the network cache via the RBS  510  and through a network gateway, which gateway so to say connects the wireless communication network and the network in which the network cache  500  is implemented. 
       FIG. 6  is a signalling diagram schematically illustrating a practical example of interaction between different nodes and entities for client controlled caching, when using the solution. The communication or signalling between the UE  400  and the NRE  300  is e.g. made by standard IP signalling and routing mechanisms. Another example of signalling is extended Network Access Stratum, NAS, signalling with extensions in the signalling. 
     In  FIG. 6 , the first UE  400  wishes to initiate a data transfer with the network cache  500 . Before initiating the data transfer, the UE  400  requests network status information from the NRE  300  in order to be able to determine whether the state, or conditions, of the communication network are such that they are favourable, from a network point of view, for the data transfer or if the state, or conditions, of the communication are such that the data transfer would cause excessive load on the communication network. 
       FIG. 6  illustrates the first UE  400  first sending a request to the NRE  300  to start reporting network status information to the UE  400 . This request is sent via the RBS  510  which is currently serving the UE  400 . In other words, the UE  400  sends a signal “1a: Start reporting” to the RBS  510  which forwards the signal to the NRE  300  by sending a signal “1b: Start reporting” to the NRE  300 . 
     The NRE in this example is not currently receiving network status information from the NCIE  350  and consequently, send a request to the NCIE  350  to start reporting network status information to the NRE  300 . This is illustrated in  FIG. 6  by the NRE  300  sending the signal “2: Request network status” to the NCIE  350 , which starts reporting the network status information to the NRE  300  by sending the signal “3: Network status”. It shall be noted that in  FIG. 6 , it is illustrated that the network status is reported only once by the signal “3: Network status”. However,  FIG. 6  is merely a schematic illustration and the network status information may be reported regularly or continuously by sending the signal “3: Network status” at certain time intervals. 
     Once the NRE  300  receives the network status information by receiving the signal “3: Network status”, the NRE reports or sends the network status information to the UE  400  as a response to the request sent in signal “1b: Start reporting”. This is illustrated by the NRE  300  sending a signal “4a: Network status” to the RBS  510 , which forwards the signal to the UE  400  by sending the signal “4b: Network status” to the UE  400 . 
     Once the UE  400  has received the network status information, the UE is enabled to control the data transfer, i.e. data transfer, between the UE  400  and the network cache  500 . In this example, the UE determines that the network status is such that the data transfer between the UE  400  and the network cache  500  may be performed without causing excessive load on the wireless communication network or on the RBS  510  currently serving the UE  400 . Consequently, the UE  400  initiates and controls the data transfer between the UE  400  and the network cache  500 . This is illustrated in  FIG. 6  by “5: Upload information to Network Cache/Download information to UE”. This will be explained in more detail below. The downloading or uploading of data between the UE  400  and the network cache  500  is in one example realized by means of HTTP-Get messages or TCP messages. 
     Once the data transfer is completed, the UE  400  terminates the data transfer and is then no longer in need of receiving network status information reports. Consequently, the UE  400  requests the NRE  300  to stop reporting the network status information to the UE  400 . This is illustrated in  FIG. 6  by the UE  400  sending a signal “6a: Stop reporting” to the RBS  510 , which forwards the signal to the NRE  300  by sending the signal “6b: Stop reporting” to the NRE  300 . In this example, the NRE is not serving any further UEs and is hence not itself in need of obtaining network status information from the NCIE  350 . Consequently, the NRE  300  sends a signal “7: Stop reporting” to the NCIE  350  requesting the NCIE  350  to stop sending network status information to the NRE  300 . 
     It shall be noted that the time between the sending of the signal “1a: Start reporting” and the reception of the first network status report in signal “4b: Network status” may be relatively long. In case the UE  400  is moving around in the wireless communication network, the UE  400  may have been handed over to another RBS than the one which was serving the UE  400  when the UE sent the “1a: Start reporting” signal. A possible consequence of a handover is that the UE will not receive the signal “4b: Network status”. Alternatively, the signal “1a: Start reporting” may be lost due to an error situation somewhere between the UE  400  and the NRE  300 , whereby the UE  400  will not receive the signal “4b: Network status”. In one example, the UE  400  starts an internal timer when the UE sends the signal “1a: Start reporting”. If the timer expires before the UE receives the signal “4b: Network status”, the UE re-sends the signal “1a: Start reporting”. 
       FIG. 7  is a signalling diagram schematically illustrating a practical example of interaction between different nodes and entities for client controlled caching, when using the solution. 
     In this example, the signal “4b: Network status” is first being received by the UE  400 . The UE  400  determines to initiate data transfer between the UE  400  and the network cache  500 . In this example, the UE wants to download data from the network cache  500  to the UE  400 . The UE  400  sends a signal “5a: Initiate data transfer” to the network cache  500 . The signalling diagram illustrated in  FIG. 7  is somewhat simplified and it illustrates the signal “5a: Initiate data transfer” being sent directly to the network cache  500 . However, it shall be understood that the UE  400  first sends the signal to the RBS  510 , which in turn forwards to signal to the network cache  500 . The forwarding of the signal to the network cache may comprise the signal going through a plurality of nodes and/or gateways depending on where the network cache is located or implemented. 
     Thereafter, the transfer of data, i.e. downloading of data from the network cache  500  to the UE  400  in this example, is ongoing. This is illustrated by “5b: Data transfer ongoing”. From this point, the UE  400  is downloading data from the network cache  500 . During the downloading of data to the UE  400 , the UE may receive a plurality of network status information signals from the NRE  300 . At least at one point in time during the ongoing downloading of data from the network cache  500  to the UE  400 , the UE receives a signal “5e: Network status HIGH load”. This signal is received due to the NCIE  350  reporting a HIGH load to the NRE  300  in signal “5c: Network status HIGH load”, which in turns reports the HIGH load network status to the UE  400  by sending a signal “5d: Network status HIGH load” to the UE  400  via the RBS  510 . 
     In this example, the UE  400  determines to temporarily pause the downloading of data from the network cache  500  to the UE  400  by sending a signal “5f: Pause data transfer” to the network cache  500 . From this point in time, the downloading is temporarily paused. Again, the UE may receive a plurality of network status information signals or messages from the NRE  300  via the RBS  510 . At least in one point in time, the NCIE  350  reports to the NRE  300  that the load in the network is low by sending “5g: Network status LOW load” to the NRE  300 , which in turns sends the network status information to the UE  400  via the RBS  510 . When the UE  400  receives the signal “5k: Network status LOW load”, the UE  400  determines to resume the data transfer, i.e. the downloading of data in this example. The UE  400  sends a signal “5m: Resume data transfer” to the network cache  500 , whereby the downloading of data from the network cache  500  to the UE  400  is resumed, illustrated by “5n: Data transfer ongoing”. 
     At a later point in time, the UE  400  has downloaded all the data it wanted from the network cache  500  and then the UE  400  terminates the downloading of data by sending a signal “5p: Terminate data transfer” to the network cache  500 . 
     In an example, when the UE  400  sends the signal “5f: Pause data transfer” to the network cache  500 , the UE  400  starts an internal timer. In case the timer expires before the UE  400  receives the signal “5k: Network status LOW load”, the UE  400  resumes the downloading of data from the network cache  500 . The reason for having this timer is that the signal “5k: Network status LOW load” may be lost due to an error situation, and then the downloading will fail. By introducing the timer, it is ascertained that the downloading will resume at some point in time and thus not fail. In case the network status is still unfavourable for data transfer, seen from a network point of view, the UE  400  will eventually receive a subsequent new status report signal corresponding to the signal “5e: Network status HIGH load”, which will cause the UE  400  to anew pause the data transfer and starting the internal timer. 
     It should be noted that  FIGS. 3 and 4  merely illustrate various functional units in the NRE and the UE in a logical sense. The functions in practice may be implemented using any suitable software and hardware means/circuits etc. Thus, the embodiments are generally not limited to the shown structures of the NRE and the UE and the functional units. Hence, the previously described exemplary embodiments may be realised in many ways. For example, one embodiment includes a computer-readable medium having instructions stored thereon that are executable by the respective processing units for executing the functions of the NRE and the UE. The instructions executable by a computing system and stored on the computer-readable medium perform the method steps of the present invention as set forth in the claims. 
     While the embodiments have been described in terms of several embodiments, it is contemplated that alternatives, modifications, permutations and equivalents thereof will become apparent upon reading of the specifications and study of the drawings. It is therefore intended that the following appended claims include such alternatives, modifications, permutations and equivalents as fall within the scope of the embodiments and defined by the pending claims.