Field of the invention
The present disclosure relates to a wireless communication technology
and particularly to a file transmission and distributed storage technology in a
wireless communication system.
Background of the invention
File transmission services III an existing mobile communication
system include a Multimedia Message Service (MMS) which has a limited
file size of 500kB and uses the technology of General Packet Radio Service
(GPRS) for transmission at a low transmission rate (maximum 384kbps,
_ typically 50kbps) and at a high expense. Although it has relatively fast
message delivery time, due to its size limit and high price, this service has
never entered to the pervasive mass market. And after receiver retrieves the
MMS message, it is immediately deleted from MMS server, and thus can not
be reused or shared.
On the trend of the web market, Google and Microsoft have already
offered non-deleting search-enabled GB-size email service and file sharing
service. However these web-based solutions also have shortcomings of being
not aware of the sender and receiver"s location information, sender and
receiver"s web-surfing habit, and being not able to provide better QoS and
ubiquitous wireless access. An end user still has to be always online and with
a fixed IP, otherwise the TCP connection will break due to a handover across
cells and other reasons while a large file is being transmitted with a limited
bandwidth. Then the amount of consumed power of the wireless user
equipment being online all the time may be dramatically increased. A request
to resume the transmission connection directly is currently absent in the
HTTP and FTP protocols, and in order to resume a broken transfer, the size of
the file transmitted between the client and the server has to be known and a
download offset has to be altered correspondingly, which may not be
2
supported by all the servers. An upper firewall within a network path also
tends to block the new request to resume the broken transfer because the user
equipment may possibly have altered its source IP address. A file-level check
is absent in the HTTP and FTP protocols, and an error may occur easily,
which case will be worse for a single file being too large. The entire file will
also become useless even if a byte in the file is corrupted and has to be
downloaded again from the very beginning. Thus it"s very difficult to transmit
and resume an original file accurately from a remote site via the HTTP and
the FTP in a wireless context. Moreover in the Internet-based solutions, an
operator becomes a conduit over which data is transmitted but can not control
the direct billing information of a subscriber and thus can not easily charge e the sender differently.
In view of the foregoing shortcomings in the prior art, it is currently
desired to offer a high-speed file transmission, storage and search service in a
wireless communication network.
Summary of the invention
In order to overcome the foregoing shortcomings in the prior art and to
meet a requirement of a user for a new service, the invention proposes a
method of file transmission based on distributed storage in a wireless
communication system.
In an embodiment of the invention, there is provided a method of file
uploading in a wireless communication network including wireless access
nodes, a control node and a user prediction system. The method comprises the
steps of: S11. a user equipment transmitting slice metadata information of a
file to the control node to request for uploading the file to a destination; SI2.
the user prediction system predicating a movement of the user equipment and
determining a plurality of storage wireless access nodes of the user equipment
according to the movement; S13. the control node confirming the request
regarding the uploading; SI4. the user equipment transmitting slices of the
file to the storage wireless access nodes; and SI5. the storage wireless access
3
nodes receiving and storing the slices of the file from the user equipment and
transmitting storage indication information of the slices of the file to the
control node.
In another embodiment of the invention, there is provided a method of
downlink file transmission in a wireless communication network including
wireless access nodes, a control node and a user prediction system. The
method comprises the steps of: S21. the control node determining slice
metadata information of a file to be transmitted to a user equipment; S22. the
user prediction system predicating a movement of the user equipment and
determining a plurality of storage wireless access nodes of the user equipment
according to the movement; and S23. the storage wireless access nodes
receiving and storing slices of the file and transmitting storage indication
information of the slices of the file to the control node.
In a further embedment of the foregoing method of downlink file
transmission, the method further comprises the step of: S24. the user
equipment receiving the slices of the file from the storage wireless access
nodes and merging the slices of the file into the file.
In another embodiment of the invention, there is provided a method of
transmitting a file from a first user equipment to a second user equipment in a
wireless communication network including wireless access nodes, a control
node and a user prediction system. The method comprises the steps of: S3 i .
the first user equipment transmitting slice metadata information of the file to
the control node; S32. the user prediction system predicating movements of
the first user equipment and the second user equipment and determining a
plurality of storage wireless access nodes of the first user equipment and the
second user equipment respectively according to the movements; S33. the
first user equipment encrypting the slices of the file using a key generated by
an SIM card of the first user equipment and transmitting the encrypted slices
to the storage wireless access nodes of the first user equipment; S34. the
storage wireless access nodes of the first user equipment receiving and
storing the slices of the file from the first user equipment, transmitting
4
storage indication information of the slices of the file to the control node and
transmitting the slices of the file to the storage wireless access nodes of the
second user equipment; S35. the storage wireless access nodes of the second
user equipment receiving and storing the slices of the file and transmitting
storage indication information of the slices of the file to the control node.
Optionally in the foregoing embodiment, the control node can
dynamically select a relatively idle access node or nodes according to load
conditions of the respective storage wireless access nodes to perform
re-encryption of the file slices required by the second user equipment for the
purpose of load balancing.
In an embodiment of the invention, there is provided a method of e searching for a file in a wireless communication network including wireless
access nodes, a control node and a user prediction system, the method
including the steps of: S41. each of the wireless access nodes building a
database of keyword indexes according to keywords in file slice contents and
storing the databases on the wireless access nodes when they are idle; S42.
the control node receiving a request message from a user equipment
regarding a search for a specific keyword and transmitting a searching
command regarding the keyword to the wireless access nodes; S43. the
wireless access nodes searching the databases of keyword indexes according
to the searching command and reporting search matching results of slices
back to the control node; S44. the user predication system predicating a
movement of the user equipment and generating parameters related to
locations of the wireless access nodes according to the movement; and S45.
the control node generating file matching results according to the search
matching results of slices in combination with the parameters related to the
relative locations of the wireless access nodes where the slices are located
and generating a list of download candidates according to the file matching
results.
With the technical solutions of the invention, wireless access nodes in
a wireless communication network are provided with a capability of
5
distributed storage, and the transmission process of a file between a user
equipment and the wireless access nodes and the transmission process of the
file between the wireless access nodes can become two relatively independent
processes. An end-to-end communication link between user equipments will
not be required any longer, and a parallel transmission is assisted by a
plurality of groups of wireless access nodes. Furthermore, a file is divided
into slices, and each of the slices can be transmitted concurrently through the
wireless access nodes of different systems, thereby greatly improving a speed
at which the file is transmitted.
Brief description of drawings
Other features, objects and advantages of the invention will become
more apparent upon reviewing the following detailed description of
non-limiting embodiments taken with reference to the drawings in which:
Fig.! illustrates a schematic diagram of system components of a
wireless communication network according to an embodiment of the
invention;
Fig.2 illustrates a flow chart of a method of file uploading in a
wireless communication network including wireless access nodes, a control
node and a user prediction system according to an embodiment of the
invention;
Fig.3 illustrates a flow chart of a method of downlink file transmission
III a wireless communication network including wireless access nodes, a
control node and a user prediction system according to an embodiment of the
invention;
Fig.4 illustrates a schematic diagram of system components of a
wireless communication network according to a further embodiment of the,
invention;
Fig.5 illustrates a flow chart of a method of transmitting a file from a
first user equipment to a second user equipment in a wireless communication
network including wireless access nodes, a control node and a user prediction
6
system according to an embodiment of the invention; and
Fig.6 illustrates a flow chart of a method of searching for a file in a
wireless communication network including wireless access nodes, a control
node and a user prediction system according to an embodiment of the
invention.
Identical or like reference numerals denote corresponding features
throughout the drawings.
Detailed description of embodiments
Fig.l illustrates a schematic diagram of system components of a
wireless communication network according to an embodiment of the
• invention. As illustrated, the wireless communication network in this
embodiment includes a control node 30, a user prediction system 40, wireless
access nodes 11, 12 and 13, and a user equipment 50. Optionally the network
further comprises a home subscriber server 61, an application server 62, an
Internet network 63, and serving gateways 67 and 68.
In this embodiment, the wireless access nodes 11, 12 and 13 are, for
example, but will not be limited to evolved Nodes B (eNBs), and the control
node 30 is, for example, but will not be limited to a Mobility Management
Entity (MME).
Fig.2 illustrates a flow chart of a method of file uploading in a
wireless communication network including wireless access nodes, a control
node and a user prediction system according to an embodiment of the
invention. As illustrated, this method comprises five steps S11, S12, S13, S14
and SIS. A flow of this method will be described below with reference to
Fig.l and Fig.2.
In the step S11, a user equipment transmits slice metadata information
of a file to the control node to request for uploading the file to a destination.
Specifically, for example, the user equipment 50 transmits slice
metadata information of a file Fl to the control node 30 to request for
uploading the file F1 to a destination. The slice metadata information
7
includes, for example, but will not be limited to the size of the file, the size of
a slice and the number of slices. In this embodiment, the destination to which
the file Fl is uploaded is, for example, but will not be limited to a server in
the Internet network.
In the step S12, the user prediction system predicates a movement of
the user equipment and determines a plurality of storage wireless access
. nodes of the user equipment according to the movement.
Specifically, for example, the user prediction system 40 predicates a
movement of the user equipment 50 and determines a plurality of storage
wireless access nodes of the user equipment 50 according to the movement.
For example, the user prediction system 40 predicates a movement path of the
user equipment 50 and determines that the movement path traverses signal
coverage areas of the wireless access nodes 11, 12 and 13 and then
determines the wireless access nodes 11, 12 and 13 as storage wireless access
nodes of the user equipment 50. Stated otherwise, the wireless access nodes
11, 12 and 13 are configured to store file slices uploaded from the user
equipment 50.
Optionally the user prediction system 40 may predicate the movement
of the user equipment 50 according to historical custom information of the
user equipment 50. The historical custom information here includes a
historical regular movement custom of the user equipment 50, for example,
going-to-office and going-home time and routes of a working day.
Optionally the user prediction system 40 can further predict the
movement of the user equipment 50 in connection with geographical
information. For example, the user equipment 50 is traveling on a one-way
street, and then the user prediction system 40 may predicate that the user
equipment 50 will continue with going forward along this one-way street.
Preferably the user prediction system 40 may further optimize a distribution
of expected storage amounts of the storage wireless access nodes on the way
according to a movement speed of the user equipment 50.
In the step S13, the control node confirms the request regarding the
8
uploading.
Specifically, for example, the control node 30 confirms the request of
the user equipment 50 to upload the file. If slices are encrypted, then it
requests the home subscriber server of the sender according to the slice
condition of the file request and a predication result of the predication system
to generate an appropriate set of challenge values of the random numbers and
a corresponding set of return values and to forward the set of the challenge
values of the random numbers to the user equipment 50 via the wireless
access node currently accessed by the user equipment 50 and while
transmitting the set of the challenge values of the random numbers and the set
of the return values to the respective predicated storage wireless access nodes
on the way for authentication of the file slices uploaded from the user
equipment.
In the step S14, the user equipment transmits slices of the file to the
storage wireless access nodes.
Specifically, for example, the user equipment 50 transmits slices of the
file Fl to the wireless access nodes 11, 12 and 13. Each of the wireless access
nodes 11, 12 and 13 can receive the respective file slices by virtualizing
several user equipments. For the user equipment 50 being a sender, each of
the virtualized user equipments is a standard user equipment and thus can be
compatible with existing network signaling. For the control node 30, it can
also control a storage composed of each of the virtualized user equipments
via the existing network standard signaling.
Optionally when the user equipment 50 may concurrently access a
plurality of wireless access nodes, for example, the wireless access nodes 11
and 12, the user equipment 50 may concurrently transmit the file slices of the
file Fl to the plurality of wireless access nodes.
Optionally when the user equipment 50 IS handed over from the
wireless access node 11 to the wireless access node 12, the file slices which
have not been completely uploaded to the wireless access node 11 can be
further uploaded to the wireless access node 11 via the wireless access node
9
12 through a temporary tunnel established between the wireless access nodes
11 and 12.
Optionally there may be only one storage wireless access node serving
the user equipment 50 if the user equipment 50 does not move; and the
control node 30 may further allocate an appropriate wireless access node or
nodes as a temporary assisting node or nodes of the storage wireless access
node of the user equipment 50 to thereby further improve the rate of
uploading.
In the step S15, the storage wireless access nodes receive and store the
slices of the file from the user equipment and transmit storage indication
information of the slices of the file to the control node.
Specifically, for example, the wireless access nodes 11, 12 and 13
receive and store the slices of the file F1 from the user equipment 50 and
transmit storage indication information of the slices of the file respectively
stored by them to the control node 30. The storage indication information of
the slices includes, for example, but will not be limited to indicator of the
slices, an indicator of the wireless access node, etc.
Optionally after the user equipment 50 transmits all the slices of the
file F1 to the storage wireless access nodes, the control node 30 may feed a
practical storage distribution condition of the slices of the file F1 on the
respective storage wireless access nodes back to the user predication system
40 so that the user predication system 40 revises the prediction algorithm to
improve the accuracy of predication.
Optionally the control node 30 may generate an index table between
files and storage indication information of slices of the files to index the file
slices. A user equipment may firstly index the file in the index table while
downloading the file. If the slices of the desired file have been stored in the
wireless access nodes, then the download may be accelerated by downloading
from the wireless access nodes. Each file has a corresponding life period for
which the wireless access nodes of the file store the received slices of the file
for possible downloading or sharing. A corresponding user can be alerted of
10
whether to extend the life period of the file after the life period of the file
slices expires. If the user does not keep the file, then the wireless access
nodes delete all the slices of the file or dump the file slices to a dedicated
server in the system. Specifically the wireless access nodes may mark the file
slices to be deleted as trashed slices instead of physically really deleting the
slices and delete the slice which has been kept for the longest period of time
according to the time stamp order, if there is a further new space request.
Thus a mobile communication network with a capability of distributed
storage can be realized. The control node 30 here plays a similar role as an
indexing server in the point-to-point technology, and the wireless access node
here plays a similar role as a peer terminal entity in the point-to-point
technology. The transmission of a file from a user equipment to a wireless
access node and the transmission of the file from the wireless access node to
a remote destination can become two relatively independent processes, and a
communication link between the user equipment and the remote destination
will not be required, thereby greatly improving a speed at which the file is
uploaded.
In an embodiment of the invention, the step S14 includes: the user
equipment encrypting the slices of the file using a key generated by an SIM
card according to the obtained challenge value of the random number and
transmitting the encrypted slices to the storage wireless access nodes.
Specifically, the user equipment 50, using a SIM card, can obtain a set
of challenge values of the random numbers for authentication from the home
subscriber server 61 via the control node 30 in the step S13 according to the
slice condition before the file is uploaded. The step S14 further comprises:
the user equipment 50 encrypting some of the slices of the file F1 using a key
calculated from the SIM card and the challenge value of the random number
and writing the corresponding challenge value of the random number and
corresponding return values into header of the file slice to enhance the
confidentiality of the file.
Optionally a different slice is encrypted using a key calculated from a
11
different challenge value of the random number. Thus the confidentiality of
the file can be further enhanced.
Optionally the step S15 further comprises: each of the wireless access
nodes further verifying the file slice uploaded from the user equipment for
legality as a result of comparing the challenge value of the random number
and the corresponding return values obtained by itself with the challenge
value of the random number and the corresponding return values of the slice.
Optionally the step S15 further comprising: if the destination is not
another user equipment, the storage wireless access nodes decrypting the
slices of the file from the user equipment using a key indicated by the control
node and transmitting the decrypted slices to the destination.
Specifically, for example, the destination to which the file F1 is
uploaded is a server in the Internet network. Then a request can be initiated to
the server in the Internet network 63 via the control node 30 and the
application server 62 after all the slices of the file F1 are stored in the
wireless access nodes 11, 12 and 13. The control node 30 may initiate a
transmission channel to be established between the wireless access nodes 11,
12 and 13 and the Internet network 63 upon confirmation from the server in
the Internet network 63, and the transmission channel includes, for example,
but will not be limited to the serving gateways 67 and 68. The control node
30 may instruct the wireless access nodes 11, 12 and 13 to transmit the plain
slices of the file F1 to the server in the Internet network 63 in an order of file
contents.
Optionally in the foregoing embodiment, the control node 30 may
instruct the wireless access nodes to start the transmission of some of the
plain slices without waiting for the completed uploading of all the slices, if
the transmission of the slices is supported over the Internet work so as to
accelerate the transmission.
The slices of the file F1 stored in the wireless access nodes 11, 12 and
13 shall be decrypted before being transmitted to the Internet network 63
since they have been encrypted using the key calculated from the challenge
12
•
value of the random number of the SIM card. A decryption key is requested
by the control node 30 from the home subscriber server 61 and notified to the
wireless access nodes 11, 12 and 13 in such a specific process that the control
node 30 obtains ,the challenge value of the random number of the SIM card
attached to the header of each file slice from the storage indication
information and reports the challenge value of the random number together
with a unique identifier of the user equipment to the home subscriber server
61; the home subscriber server 61 determines a decryption key from the
challenge value of the random number of the SIM card and returns the
decryption key to the control node 30; and the control node 30 transmits the
decryption key to the wireless access nodes 11, 12 and 13. Then the wireless
access nodes 11, 12 and 13 decrypt the slices of the file F1 and transmit the
decrypted slices to the Internet network 63. The file slices still stored in the
wireless access nodes 11, 12 and 13 are encrypted file slices.
In an embodiment of the invention, the step S13 further includes: the
control node instructing the storage wireless access nodes to reserve storage
spaces.
Specifically, for example, the control node 30 confirms the request of
the user equipment 30 regarding uploading the file Fl, inquires the user
predication system 40 to known that storage wireless access nodes of the user
equipment 50 are the wireless access nodes 11, 12 and 13 and instructs the
wireless access nodes 11, 12 and 13 to reserve storage spaces for storing the
slices of the file Fl. Thus the process of uploading the file Fl from the user
equipment 50 can made more reliable and less error-prone.
In an embodiment of the invention, the user equipment transmits the
slices of the file to the storage wireless access nodes in an inconsecutive
manner in the step S14.
Specifically, for example, the user equipment 30 may transmit the
slices 1, 5 and 7 of the file F1 to the wireless access node 11, the slices 2, 4
and 9 of the file F1 to the wireless access node 12, the slices 3, 6 and 8 of the
file Fl to the wireless access node 13, etc. Thus the plurality of slices of the
13
file F1 are transmitted in an inconsecutive manner to the plurality of storage
wireless access node so that the file F1 can be more secured as a whole and
the contents of a significant section of the file F1 will not be leaked due to
content leakage at a specific wireless access node.
In an embodiment of the invention, the storage wireless access nodes
comprise at least one group; and the storage wireless access nodes in any
group store the slices of the file from the user equipment ill a
mutually-redundant network-sharing manner in the step S15.
Specifically, for example, the wireless access nodes 11, 12 and 13
constitute a group, and each of the wireless access nodes stores a part of the
slices of the file F1 and some redundant information so that even if the file
_ stored in a specific wireless access node is lost, the entire file F1 can be
recovered from data stored in another wireless access node or nodes. Thus the
reliability of file storage can be improved.
Preferably the wireless access nodes may not be physically tied to
storage devices. Alternatively a network file server within the group can be
virtually loaded over the network for the purpose of centralized management
of storage devices (e.g., an array of RAID hard disks) at a lowered cost.
Fig.3 illustrates a flow chart of a method of downlink file transmission
ill a wireless communication network including wireless access nodes, a
control node and a user prediction system according to an embodiment of the
invention. As illustrated, this method comprises five steps S21, S22, S23, S24
and S25. A flow of this method will be described below with reference to
Fig.l and Fig.3.
In the step S21, the control node determines slice metadata
information of a file to be transmitted to a user equipment.
Specifically, for example, the control node 30 determines slice
metadata information of a file F2 to be transmitted to the user equipment 30.
The slice metadata information includes, for example, but will not be limited
to the size of the file, the size of a slice and the number of slices. In this
embodiment, a source of the file F2 includes, for example, but will not be
14
limited to a server in the Internet network.
In the step S22, the user prediction system predicates a movement of
the user equipment and determines a plurality of storage wireless access
nodes of the user equipment according to the movement.
Specifically, for example, the user prediction system 40 predicates a
movement of the user equipment 50 and determines a plurality of storage
wireless access nodes of the user equipment 50 according to the movement.
For example, the user prediction system 40 predicates a movement path of the
user equipment 50 and determines that the movement path traverses signal
coverage areas of the wireless access nodes 11, 12 and 13 and then
determines the wireless access nodes 11, 12 and 13 as storage wireless access
_ nodes of the user equipment 50. Stated otherwise, the wireless access nodes
11, 12 and 13 are configured to store slices of the file F2".
Optionally the user prediction system 40 may predicate the movement
of the user equipment 50 according to historical custom information of the
user equipment 50. The historical custom information here includes a
historical regular movement custom of the user equipment 50, for example,
going-to-office and going-home time and routes of a working day.
Optionally the user prediction system 40 can further predict the
movement of the user equipment 50 in connection with geographical
information. For example, the user equipment 50 is traveling on a one-way
street, and then the user prediction system 40 may predicate that the user
equipment 50 will continue with going forward along this one-way street.
Preferably the user prediction system 40 may further optimize a distribution
of expected storage amounts of the storage wireless access nodes on the way
according to a movement speed of the user equipment 50.
In the step S23, the storage wireless access nodes receive and store
slices of the file and transmit storage indication information of the slices of
the file to the control node.
Specifically, for example, the wireless access nodes 11, 12 and 13
receive and store the slices of the file F2 and transmit storage indication
15
information of the slices of the file respectively stored by them to the control
node 30. The storage indication information of the slices includes, for
example, but will not be limited to indicator of the slices, an indicator of the
wireless access node, etc. Each of the wireless access nodes 11, 12 and 13 can
receive the respective file slices by virtualizing several user equipments. For
the user equipment 50 being a receiver, each of the virtualized user
equipments is a standard user equipment and thus can be compatible with
existing network signaling. For the control node 30, it can also control a
storage composed of each of the virtualized user equipments via the existing
network standard signaling.
Optionally after the user equipment 50 completely downloads all the
slices of the file F2 from the wireless access nodes, the control node 30 may
feed a practical storage distribution condition of the slices of the file F2 on
the respective storage wireless access nodes back to the user predication
system 40 so that the user predication system 40 revises the prediction
algorithm to improve the accuracy of predication.
Optionally the control node 30 may generate an index table between
files and storage indication information of slices of the files to index the file
slices. A user equipment may firstly index the file in the index table while
downloading the file. If the slices of the desired file have been stored in the
wireless access nodes, then the download may be accelerated by downloading
from the wireless access nodes. Each file has a corresponding life period for
which the wireless access nodes of the file store the received slices of the file
for possible downloading or sharing. A corresponding user can be alerted of
whether to extend the life period of the file after the life period of the file
slices expires. If the user does not keep the file, then the wireless access
nodes delete the file slices or dump the file slices to a dedicated server in the
system. Specifically the wireless access nodes may mark the file slices to be
deleted as trashed slices instead of physically really deleting the slices and
delete the slice which has been kept for the longest period of time according
to the time stamp order, if there is a further new space request. Thus a mobile
16
communication network with a capability of distributed storage can be
realized. The control node 30 here plays a similar role as an indexing server
in the point-to-point technology, and the wireless access node here plays a
similar role as a peer terminal entity in the point-to-point technology. The
transmission of a file from a remote source to a wireless access node and the
transmission of the file from the wireless access node to a user equipment can
become two relatively independent processes, and a communication link
between the user equipment and the remote source will not be required,
thereby greatly improving a speed at which the file is downloaded.
In an embodiment of the invention, the method further comprises a
step S24 in which the user equipment receives the slices of the file from the
storage wireless access nodes and merges the slices of the file into the file.
Specifically, for example, the user equipment 50 receives the slices of
the file F2 from the wireless access nodes 11, 12 and 13 and merges the slices
of the file into the file F2. Optionally the wireless access nodes 11, 12 and 13
may transmit a slice of the file F2 to the user equipment upon receiving and
storing the slice without waiting for the completed storage of the other slice
or slices.
Optionally when the user equipment 50 may concurrently access a
plurality of wireless access nodes, for example, the wireless access nodes 11
and 12, the user equipment 50 may concurrently receive the file slices of the
file F2 from the plurality of wireless access nodes.
Optionally when the user equipment 50 is handed over from the
wireless access node 11 to the wireless access node 12, the file slices in the
wireless access node 11 which have not been completely downloaded can be
further downloaded to the user equipment 50 via the wireless access node 12
through a temporary tunnel established between the wireless access nodes 11
and 12.
Optionally there may be only one storage wireless access node serving
the user equipment 50 if the user equipment 50 does not move; and the
control node 30 may further allocate an appropriate wireless access node or
17
nodes as a temporary assisting node or nodes of the storage wireless access
node of the user equipment 50 to thereby further improve the rate of
uploading.
In an embodiment of the invention, the step 23 comprises: the storage
wireless access nodes encrypting and storing the slices of the file using a key
indicated by the control node, which can be generated by an SIM card of the
user equipment; and the step S24 includes: the user equipment decrypting the
slices of the file using the key generated by the SIM card of the user
equipment.
Specifically, for example, the user equipment 50, using a SIM card,
can obtain authentication from the home subscriber server 61 via the control e node 30 before the slices of the file F2 are stored to the wireless access nodes.
Before the step S23, the control node 30 inquires the home subscriber server
61 according to the slice condition to obtain challenge values of the random
numbers and a corresponding set of keys and sets of return values, which can
be generated by the SIM card of the user equipment 50, and notifies the
wireless access nodes 11, 12 and 13 of these challenge values of the random
numbers, keys and return values. The step 23 comprises: the wireless access
nodes 11, 12 and 13 encrypting and storing the slices of the file F2 using the
keys indicated by the control node and writing the corresponding challenge
values of the random numbers and return values into headers of the file slices.
In the step S24, upon reception of the encrypted slices of the file F2 from the
wireless access nodes 11, 12 and 13, the user equipment 30 firstly determines
whether the return values generated for the challenge values of the random
numbers according to the SIM card are the same as the return values stored in
the headers of the file slices, and if they are the same, then the user
equipment decrypts these slices using the keys generated by the SIM card of
the user equipment for the challenge values of the random numbers.
In an embodiment of the invention, after the step S22, the method
further comprises: the control node instructing the storage wireless access
nodes to reserve storage spaces.
18
Specifically, for example, the control node 30 inquires the user
predication system 40 to known that storage wireless access nodes of the user
equipment 50 are the wireless access nodes 11, 12 and 13 and instructs the
wireless access nodes 11, 12 and 13 to reserve storage spaces for storing the
slices of the file F2. Thus the process of downloading the file F2 to the user
equipment 50 can made more reliable and less error-prone.
In an embodiment of the invention, the storage wireless access nodes
receive and store the slices of the file in an inconsecutive manner in the step
S23.
Specifically, for example, the user equipment 30 may instruct the
wireless access node 11 to receive and store the slices 1, 5 and 7 of the file F2,
instruct the wireless access node 12 to receive and store the slices 2, 4 and 9
of the file F2, instruct the wireless access node 13 to receive and store the
slices 3, 6 and 8 of the file F2, etc. Thus the plurality of slices of the file F2
are transmitted in an inconsecutive manner to the plurality of storage wireless
access nodes so that the file F2 can be more secured as a whole and the
contents of a significant section of the file F2 will not be leaked due to
content leakage at a specific wireless access node.
In an embodiment of the invention, the storage wireless access nodes
comprise at least one group; and the storage wireless access nodes in any
group store the slices of the file in a mutually-redundant network-sharing
manner in the step S23.
Specifically, for example, the wireless access nodes 11, 12 and 13
constitute a group, and each of the wireless access nodes stores a part of the
slices of the file F2 and some redundant information so that even if the file
stored in a specific wireless access node is lost, the entire file F2 can be
recovered from data stored in another wireless access node or nodes. Thus the
reliability of file storage can be improved.
Preferably the wireless access nodes may not be physically tied to
storage devices. Alternatively a network file server within the group can be
virtually loaded over the network for the purpose of centralized management
19
of storage devices (e.g., an array of RAID hard disks).
Fig.4 illustrates a schematic diagram of system components of a
wireless communication network according to a further embodiment of the
invention. As illustrated, the wireless communication network in this
embodiment includes control nodes 31 and 32, a user prediction system 40,
wireless access nodes 11, 12, 13, 21, 22 and 23, and user equipments 51 and
52. Optionally the network further comprises a home subscriber server 61, an
application server 62, an Internet network 63, and serving gateways 67 and
68.
In this embodiment, the wireless access nodes 11, 12, 13, 21, 22 and
23 are, for example, but will not be limited to evolved Nodes B (eNBs), and
~ the control nodes 31 and 32 are, for example, but will not be limited to
Mobility Management Entities (MMEs).
Fig.5 illustrates a flow chart of a method of transmitting a file from a
first user equipment to a second user equipment in a wireless communication
network including wireless access nodes, control nodes and a user prediction
system according to an embodiment of the invention. As illustrated, this
method comprises five steps S31, S32, S33, S34 and S35. A flow of this
method will be described below with reference to Fig.4 and Fig.5.
In the step S31, the first user equipment transmits slice metadata
information of the file to the control node.
Specifically, for example, the user equipment 51 transmits slice
metadata information of a file F3 to the control node 31 of the user equipment
to request for uploading the file F3 to the user equipment 52. The slice
metadata information includes, for example, but will not be limited to the size
of the file, the size of a slice and the number of slices.
In the step S32, the user prediction system predicates movements of
the first user equipment and the second user equipment and determines a
plurality of storage wireless access nodes of the first user equipment and the
second user equipment respectively according to the movements.
Specifically, for example, the user prediction system 40 predicates
20
movements of the user equipments 51 and 52 and determines a plurality of
storage wireless access nodes of the user equipments 50 and 51 according to
the movements. For example, the user prediction system 40 predicates a
movement path of the user equipment 51 and determines that the movement
path traverses signal coverage areas of the wireless access nodes 11, 12 and
13 and then determines the wireless access nodes 11, 12 and 13 as storage
wireless access nodes of the user equipment 51; and the user prediction
system 40 predicates a movement path of the user equipment 52 and
determines that the movement path traverses signal coverage areas of the
wireless access nodes 21, 22 and 23 and then determines the wireless access
nodes 21, 22 and 23 as storage wireless access nodes of the user equipment
52.
In the step S33, the first user equipment encrypts the slices of the file
using a key generated by an SIM card of the first user equipment and
transmits the encrypted slices to the storage wireless access nodes of the first
user equipment.
Specifically, the user equipment 51, using an SIM card, may obtain
authentication from the home subscriber server 61 via the control node 31
before the file is uploaded. In the step S33, the user equipment 51 encrypts
the slices of the file F3 using a key calculated from the challenge value of the
random number of the SIM card, writes the corresponding challenge value of
the random number into a header of the file and transmits the slices to the
wireless access nodes 11, 12 and 13. Thus the confidentiality of the file can
be enhanced.
Optionally a different slice is encrypted using a key calculated from a
different challenge value of the random number. Thus the confidentiality of
the file can be further enhanced.
In the step S34, the storage wireless access nodes of the first user
equipment receive and store the slices of the file from the first user
equipment, transmit storage indication information of the slices of the file to
the control node and transmit the slices of the file to the storage wireless
21
access nodes of the second user equipment.
Specifically, for example, the wireless access nodes 11, 12 and 13
receive and store the slices of the file F3 from the user equipment 51,
transmit storage indication information of the slices of the file respectively
stored by them to the control node 31 and transmit the slices of the file F3 to
the wireless access nodes 21, 22 and 23. The storage indication information
of the slices includes, for example, but will not be limited to indicator of the
slices, an indicator of the wireless access node, etc. Each of the wireless
access nodes 11, 12, 13,21, 22 and 23 can receive the respective file slices by
virtualizing several user equipments. For the user equipments 51 and 52
being a sender and a receiver, each of the virtualized user equipments is a
standard user equipment and thus can be compatible with existing network
signaling. For the control nodes 31 and 32 and other existing network
equipments, they can also control respective storages composed of each of the
virtualized user equipments via the existing network standard signaling.
Wherein, the control nodes 31 and 32 may initiate a transmission
channel to be established between the wireless access nodes 11, 12 and 13
and the wireless access nodes 21, 22 and 23, and the transmission channel
includes, for example, but will not be limited to the serving gateways 67 and
68. The control hode 31 may instruct the wireless access nodes 11, 12 and 13
to transmit the slices of the file F3 to the wireless access nodes 21, 22 and 23.
Optionally the wireless access nodes 21, 22 and 23 store the slices of the file
F3 in an order different from the order in which the wireless access nodes 11,
12 and 13 store the slices of the file F3.
Optionally the wireless access nodes 11, 12 and 13 may start the
transmission of data to the wireless access nodes 21, 22 and 23 without
waiting for the completed uploading of all of the slices, so as to accelerate the
transmission.
In the step S35, the storage wireless access nodes of the second user
equipment receive and store the slices of the file and transmit storage
indication information of the slices of the file to the control node.
22
Specifically, for example, the wireless access nodes 21, 22 and 23
receive and store the slices of the file F3 as instructed by the control node 32
and transmit storage indication information of the stored slices to the control
node 32.
The user equipment 52 receIves the slices of the file F3 from the
wireless access nodes 21, 22 and 23 in a similar process as that of the step
S24 in the foregoing embodiment.
.Optionally the control nodes 31 and 32 may generate an index table
between files and storage indication information of slices of the files to index
the file slices. A user equipment may firstly index the file in the index table
while downloading the file. If the slices of the desired file have been stored in
the wireless access nodes, then the download may be accelerated by
downloading from the wireless access nodes. Each file has a corresponding
life period for which the wireless access nodes of the file store the received
slices of the file for possible downloading or sharing. After the life period of
the file slices expires, the wireless access nodes may delete the file slices or
dump the file slices to a dedicated server in the system. Thus a mobile
communication network with a capability of distributed storage can be
realized. The control nodes 31 and 32 here playa similar role as an indexing
server in the point-to-point technology, and the wireless access node here
plays a similar role as a peer terminal entity in the point-to-point technology.
The transmission process of a file between a user equipment and wireless
access nodes and the transmission process of the file between the wireless
access nodes can become two relatively independent processes, and an
end-to-end communication link between the user equipments will not be
required, thereby greatly improving a speed at which the file is transmitted.
In an embodiment of the invention, the step S34 further comprises: the
storage wireless access nodes of the first user equipment decrypting the slices
of the file using the SIM card key of the first user equipment obtained from
the control node and encrypting the slices of the file using an SIM card key of
the second user equipment obtained from the control node.
23
Specifically, for example, the wireless access nodes 11, 12 and 13
obtain keys corresponding to challenge values of the random numbers of the
SIM card of the user equipment 51 from the control node 31 and decrypt the
stored slices of the file F3 using these keys into plain slices. Then the
wireless access nodes 11, 12 and 13 obtain keys from the control node 32,
which can be generated by an SIM card of the user equipment 52, re-encrypt
the plain slices of the file F3 using these keys and write corresponding
random numbers into headers of the file slices. The wireless access nodes 11,
12 and 13 transmit the re-encrypted slices of the file F3 to the wireless access
nodes 21, 22 and 23.
In an embodiment of the invention, the step S35 further comprises:
decrypting the slices of the file using the SIM card key of the first user
equipment and encrypting the slices of the file using an SIM card key of the
second user equipment, and storing the slices of the file encrypted using the
SIM card key of the second user equipment.
Specifically, for example, the slices of the file F3 received by the
wireless access nodes 21, 22 and 23 from the wireless access nodes 11, 12
and 13 are encrypted with the keys generated by the SIM card of the user
equipment 51. The wireless access nodes 21, 22 and 23 obtain keys
corresponding to the challenge values of the random numbers of the SIM card
of the user equipment 51 from the control node 31 and decrypt the stored
slices of the file F3 using these keys into plain slices. Then the wireless
access nodes 21, 22 and 23 obtain keys from the control node 32, which can
be generated by an SIM card of the user equipment 52, re-encrypt the plain
slices of the file F3 using these keys and write corresponding random
numbers into headers of the file slices. The wireless access nodes 21, 22 and
23 store the re-encrypted slices of the file F3.
In an embodiment of the invention, optionally in the steps S34 and
S35, the control nodes can dynamically select a relatively idle access node or
nodes among the wireless access nodes 11, 12, 13,21,22 and 23 according to
load conditions of the respective storage wireless access nodes to perform
24
re-encryption of the file slices required by the second user equipment for the
purpose of load balancing.
By encrypting the file slices stored on the wireless access nodes with
the random keys of the 81M cards, the file sharing object and range can be
easily controlled, and the charging management can be easily performed
while a strong confidentiality can be provided.
In the foregoing embodiment, the user equipment 51 is controlled by
the control node 31, and the user equipment 52 is controlled by the control
node 32. Those skilled in the art shall appreciate that the two user equipments
can be controlled by the same control node when they are closely located.
The storage wireless access nodes of the two user equipments can partially or
wholly coincide. Optionally, when the storage wireless access nodes of the
user equipments 51 and 52 partially or wholly coincide, these wireless access
nodes store the file slices encrypted using the key generated by the 81M card
of the uploader, and the downloader receives the file slices re-encrypted using
the key generated by the 81M card of the downloader after the file slices of
the uploader are decrypted. In order to save a space, it is not necessary for the
coinciding wireless access node or nodes to store two duplicates of the file
slices, which is particularly suitable for the case that the uploader performs
mass transmission of a file to a group of receiving users adjacent in physical
location (for example, workmates in an office), where a wireless access node
keeps only a minimum number of necessary file slices.
Optionally in the wireless communication network of the foregoing
embodiment, the control nodes can instruct a wireless access node with a
spare storage space to share a storage task of a wireless access node with an
insufficient storage space. If a wireless access node has insufficient storage
space, then historical data or data with its life period approaching expiration
can be dumped to a backup server to thereby optimize the storage capacity.
Optionally the wireless access nodes can report periodically the
storage indication information of the stored file to the control node to
facilitate updating of the index table at the control node. The contents of the
25
storage indication information include, for example, but will not be limited to
an indicator or indicators of the file or the slices, an indicator of a user, the
size of a file or a slice, an abstract or abstracts of the file or the slices, etc.
In the foregoing embodiment of the invention, a USIM card is adopted
in the user equipments, and the file slices are encrypted/decrypted using a key
that can be obtained by the USIM. The use of the USIM card can make full
use of an advantageous characteristic of bi-directional authentication. The
user is authenticated by the network while the network is authenticated by the
user as well to thereby enhance the security and manageability of file
transmission and sharing. A signaling integrity key can also be generated
using the USIM card to protect the integrity of the file slices. Specifically the
hash value of the content of the file slice can be added to the header of the
file slice, and the calculation is performed on the entire header of the file
slice using the integrity key, and calculation results are appended at the end of
the original header of the file slice for verification at the receiver.
Fig.6 illustrates a flow chart of a method of searching for file contents
In a wireless communication network including wireless access nodes, a
control node and a user prediction system according to an embodiment of the
invention. As illustrated, this method includes five steps S41, S42, S43, S44
and S45. A flow of this method will be described below with reference to
Fig.1 and Fig.6.
In the step S41, each of the wireless access systems builds keyword
indexes according to the contents of their stored file slices when they are idle.
The wireless access node may determine whether to build an index for the
content of the file slice according to information about the extension of the
original file in the header of the slice. If an index can be built, then the
wireless access node scans the content of the slice for keywords, and the
keywords may be, for example, but will not be limited to those which appear
repeatedly in the content of the slice, but will not be excludable auxiliary
words, modal words, punctuations, etc.. New database of indexes of the slice
contents ranked according to importance of the respective keywords is
26
created on the storage space of the wireless access node according to the
location and relevancy of the keywords. This process can be performed
constantly at background of the wireless access node as a process with a low
priority.
In the step S42, the control node receives a request message from a
user equipment regarding a search for a specific keyword and transmits a
searching command regarding the file to the wireless access nodes.
Specifically, for example, the control node 30 receives a request
message from the user equipment 50 regarding a search for a keyword WI
and transmits a searching command regarding the keyword WIto the wireless
access nodes controlled by the control node, including the wireless access
nodes 11, 12 and 13.
In the step S43, the wireless access nodes search the stored databases
of keyword indexes according to the searching command and report search
matching results of stored slices back to the control node.
Specifically, for example, the wireless access nodes controlled by the
control node 30, including the wireless access nodes 11, 12 and 13, search
their respective databases of keywords, built according to the contents of the
stored slices, according to the searching command and report the search
matching results of the stored slices to the control node 30.
In the step S44, the user predication system predicates a movement of
the user equipment and generates parameters related to locations of the
wireless access nodes according to the movement.
Specifically, for example, the user predication system 40 predicates a
movement of the user equipment 50 and generates parameters related to
relative locations between the wireless access nodes and the user equipment
50 according to the movement. A normalized parameter can be adopted so
that the parameter of the wireless access node closet to the user equipment 50
is 1. The further a wireless access node is located from the user equipment 50
the lower its corresponding parameter is.
In the step S45, the control node generates file matching results
27
•
according to the search matching results of slices in combination with the
parameters related to the relative locations of the wireless access nodes where
the slices are located and generate a list of download candidates according to
the file matching results.
Specifically, for example, the control node 30 generates file matching
results according to the search matching results of slices, reported from the
wireless access nodes controlled by the control node 30, in combination with
the parameters related to the relative locations of the wireless access nodes
where the slices are located. The control node 30 may firstly calculate
relative matching results of the respective slices, possibly as the products of
the search matching results of the slices and the proportions of the
corresponding slices in the entire file. Then a distance relative matching
result is calculated according to the relative matching results and the
parameters related to the relative locations of the wireless access nodes where
the slices are located, possibly as the products of these two parameters.
Finally a distance matching result of the file is calculated, possibly as the
simple arithmetic sum of the distance relative matching results of all the
slices of the file, A corresponding normalized parameter for the matching
result of the file may be further calculated so that the corresponding
parameter of the file with a higher extent of matching with the keyword WI is
closer to 1 and the corresponding parameter of the file with a lower extent of
matching with the keyword WI is closer to O. The control node 30 may
generate a list of download candidates in an order of the matching extents,
and each entry in the list of download candidates includes an identifier of a
wireless access node and an identifier of a file slice. The control node 30 can
instruct the user equipment 50 to perform downloading according to an
identifier of the wireless access node and the identifier of the file slice in an
entry highly ranked in the list of download candidates.
Those skilled in the art shall appreciate that the step S43 and the step
S44 may not necessarily be in an exact sequential relationship.
Optionally if the file slices stored in the wireless access nodes are
28
• encrypted, then the wireless access nodes request the control node 30 to
inquire the subscriber home server 40 to obtain corresponding keys of the
slices in the step S41, and the wireless access nodes decrypt the slices with
the keys of the slices and build databases of keyword indexes in the step S41.
The wireless access node and the control system can establish a trust
relationship and an encrypted control channel through a third-party
authentication system. The databases of keyword indexes can also be
encrypted by the wireless access nodes using random keys indicated by the
control node. The control node may transmit the random keys together with
the searching request to the respective corresponding wireless access nodes
for decryption of the databases.
Optionally the index table on the control node may include
relationships between respective users, for example, an unencrypted
disclosure, the same user, a friend, a friend of a friend, a stranger, etc., to
thereby further improve the efficiency of association searching.
Specifically for searching and downloading through a friend, an access
privilege and the downloadable size and speed of a file can be particularly
setting according to the owner user of the file, and charging can be enforced
according to the amount of download access traffic so that an operator can
offer an encouraging premium to the owner of the file.
Optionally the index table on the control node may include hash
values of the contents of the file slices, and the same file slices stored on
different wireless access nodes can be discovered during the searching to
thereby improve a download speed. This method is corresponding to an
operation of searching for a seed source in P2P downloading. The hash values
of the contents of the file slices can also be used as check values for
uploading or downloading or transmission.
Optionally a user identification code subjected to unidirectional
transformation by a hash function can be written into the header of the stored
file slice to authenticate the user for legality of the file slice prior to
downloading. Only the user equipment is authenticated distinguishing from
29
the SIM card encryption. Specifically, for example, an uploading user can
write a user identification code transformed by a hash function into the
header of the slice and upload the slice to the wireless access node. Then
when the control node detects that the header of the slice stored on the
wireless access node includes the user identification code, the control node
requests a downloading user to input the identification code and calculates
and compares a result after a transformation using the hash function. The
downloading user is authorized to start downloading of the content of the file
slice if a comparison result shows consistency.
Optionally the system may incorporate other Internet data information
captured by the wireless access nodes, e.g., an AGPS-based Google map
searching application, and dynamically store, a part of subsets of a map data
file about a corresponding route, in advance on the wireless access nodes
according to a searching request, a return result and a predicated user location
to thereby improve a download experience of the user on the way.
The advantages brought by thetechnical solutions of the invention
includes but not limited to:
1. An operator may perform bidirectional charging according to the
size and storage period (life period) of a file and offers a better service with
the help of a distributed storage of wireless access nodes and a predicated
user location.
2. A rare file may be stored for a long period on the storage of wireless
access nodes, and the absence of a file seed as in BT will not arise.
3. The operator may provide an index of disclosed information and
obtain favorite information of a wide variety of users to thereby optimize
distributed cloud storage of the information.
4. The operator may encrypt and store a private file to thereby
conveniently control a range in which the file is received or shared and also
to facilitate charging management and to enhance copyright protection.
5. Wireless access nodes act as peer entities in which a file is stored to
assist a user equipment in downloading or uploading, and a download or
30
•
,,
upload bandwidth can be increased to the maximum extent for an asymmetric
shared wireless channel.
Those skilled in the art shall appreciate that all of the foregoing
embodiments are illustrative but not limiting. Different technical features
appearing in different embodiments can be combined to advantage. Those
skilled in the art shall appreciate and implement other variant embodiments of
the disclosed embodiments upon review of the drawings, the description and
the claims. In the claims, the term "comprising" will not preclude another
device(s) or step(s); the indefinite article "a/an" will not preclude plural; and
the terms "first", "second", etc., are intended to designate a name but not to
represent any specific order. Any reference numerals in the claims shall not
be construed as limiting the scope of the invention. Functions of a plurality of
parts appearing in a claim can be performed by a separate module in hardware
or software. Some technical features appearing in different dependent claims
will not mean that these technical features can not be combined to advantage.

•
."
I1We Claim:
1. A method of file uploading in a wireless communication network
including wireless access nodes, a control node and a user prediction system,
the method comprising the steps of:
S11. a user equipment transmitting slice metadata information of a file
to the control node to request for uploading the file to a destination;
S12. the user prediction system predicating a movement of the user
equipment and determining a plurality of storage wireless access nodes of the
user equipment according to the movement;
S13. the control node confirming the request regarding the uploading;
S14. the user equipment transmitting slices of the file to the storage
wireless access nodes; and
S15. the storage wireless access nodes receiving and storing the slices
of the file from the us~r equipment and transmitting storage indication
information of the slices of the file to the control node.
2. The method according to claim 1, wherein:
the step S14 comprises: the user equipment encrypting the slices of the
file using a key generated by an SIM card and transmitting the encrypted
slices to the storage wireless access nodes.
3. The method according to claim 2, wherein the step S15 comprises:
the storage wireless access nodes decrypting the slices of the file from the
user equipment using a key indicated by the control node and transmitting the
decrypted slices to the destination if the destination is not another user
equipment.
4. The method according to claim 1, wherein the step S13 further
comprises: the control node instructing the storage wireless access nodes to
reserve storage spaces.
5. The method according to claim 1, wherein the user equipment
transmits the slices of the file to the storage wireless access nodes in an
32
inconsecutive manner in the step S14.
6. The method according to claim 1, wherein the storage wireless
access nodes comprise at least one group; and the storage wireless access
nodes in any group store the slices of the file from the user equipment in a
mutually-redundant network-sharing manner in the step S15.
7. A method of downlink file transmission in a wireless communication
network including wireless access nodes, a control node and a user prediction
system, the method comprising the steps of:
S21. the control node determining slice metadata information of a file
to be transmitted to a user equipment;
S22. the user prediction system predicating a movement of the user
equipment and determining a plurality of storage wireless access nodes of the
user equipment according to the movement; and
S23. the storage wireless access nodes receiving and storing slices of
the file and transmitting storage indication information of the slices of the file
to the control node.
8. The method according to claim 7, further comprising the step of:
S24. the user equipment receiving the slices of the file from the storage
wireless access nodes and merging the slices of the file into the file.
9. The method according to claim 8, wherein:
the step S23 comprises: the storage wireless access nodes encrypting
and storing the slices of the file using a key indicated by the control node,
It which can be generated by an SIM card of the user equipment; and
the step S24 comprises: the user equipment decrypting the slices of the
file using the key generated by the SIM card of the user equipment.
10. The method according to claim 7, wherein the storage wireless
access nodes receive and store the slices of the file in an inconsecutive
manner in the step S23.
11. The method according to claim 7, wherein the storage wireless
access nodes comprise at least one group; and the storage wireless access
nodes in any group store the slices of the file in a mutually-redundant
33
•
network-sharing manner in the step 823.
12. A method of transmitting a file from a first user equipment to a
second user equipment in a wireless communication network including
wireless access nodes, a control node and a user prediction system, the
method comprising the steps of:
831. the first user equipment transmitting slice metadata information of
the file to the control node;
832. the user prediction system predicating movements of the first user
equipment and the second user equipment and determining a plurality of
storage wireless access nodes of the first user equipment and the second user
equipment respectively according to the movements; e 833. the first user equipment encrypting the slices of the file using a
key generated by an 81M card of the first user equipment and transmitting the
encrypted slices to the storage wireless access nodes of the first user
equipment;
834. the storage wireless access nodes of the first user equipment
receiving and storing the slices of the file from the first user equipment,
transmitting storage indication information of the slices of the file to the
control node and transmitting the slices of the file to the storage wireless
access nodes of the second user equipment;
835. the storage wireless access nodes of the second user equipment
receiving and storing the slices of the file and transmitting storage indication
information of the slices of the file to the control node.
13. The method according to claim 12, wherein the step 834 further
comprises: the storage wireless access nodes of the first user equipment
decrypting the slices of the file using the 81M card key of the first user
equipment obtained from the control node and encrypting the slices of the file
using an 81M card key of the second user equipment obtained from the
control node.
14. The method according to claim 12, wherein the step 835 further
comprises: decrypting the slices of the file using the 81M card key of the first
34
I
user equipment and encrypting the slices of the file using an SIM card key of
the second user equipment, and storing the slices of the file encrypted using
the SIM card key of the second user equipment.
15. A method of searching for a file in a wireless communication
network including wireless access nodes, a control node and a user prediction
system, the method comprising the steps of:
S41. each of the wireless access nodes building a database of keyword
indexes according to keywords in file slice contents and storing the databases
on the wireless access nodes when they are idle;
S42. the control node receiving a request message from a user
equipment regarding a search for a specific keyword and transmitting a
searching command regarding the keyword to the wireless access nodes;
S43. the wireless access nodes searching the databases of keyword
indexes according to the searching command and reporting search matching
results of slices back to the control node;
S44. the user predication system predicating a movement of the user
equipment and generating parameters related to locations of the wireless
access nodes according to the movement; and
S45. the control node generating file matching results according to the
search matching results of slices in combination with the parameters related
to the relative locations of the wireless access nodes where the slices are e located and generating a list of download candidates according to the file
matching results.