1. A method for detecting unwanted digital content in a mail box stored on a mail server, the method comprising:
receiving digital content at the mail server;
performing a first scan of the digital content to determine whether the digital content includes unwanted content, wherein the first scan determines whether a signature associated with the digital content is included in a first list of signatures that identify digital content known to include unwanted content;
forwarding the digital content to the mail box; and
performing a second scan of the digital content in the mail box to determine whether the digital content includes unwanted content, wherein the second scan determines whether the signature associated with the digital content is included in a second list of signatures that identify digital content known to include unwanted content, the second list of signatures being an updated version of the first list of signatures.
2. The method of claim 1 wherein the digital content is an email message.
3. The method of claim 1 wherein the second list of signatures includes the first list of signatures and at least one additional signature.
4. The method of claim 1 further comprising:
in the event that the signature associated with the digital content is included in the first list of signatures, identifying the digital content as including unwanted content.
5. The method of claim 1 further comprising:
in the event that the signature associated with the digital content is included in the second list of signatures, identifying the digital content as including unwanted content.
6. The method of claim 1 further comprising:
in the event that the digital content is determined to include unwanted content by the second scan, discarding the digital content.
7. The method of claim 1 wherein:
in the event that the digital content is determined to not include unwanted content by the first scan, forwarding the digital content to an inbox folder in the mail box, and
in the event that the digital content is determined to include unwanted content by the second scan, moving the digital content from the inbox folder to a junk folder in the mail box.
8. The method of claim 7 further comprising:
purging the digital content from the junk folder after a predetermined time period has elapsed.
9. The method of claim 1 further comprising:
executing a first scanning thread to perform the second scan, wherein the first scanning thread performs the second scan on other digital content in the mail box by executing a first algorithm.
10. The method of claim 9 further comprising:
executing a second scanning thread that performs a scan of other digital content in another mail box by executing a second algorithm, wherein the second scanning thread executes substantially simultaneously as the first scanning thread.
11. The method of claim 1 further comprising:
identifying the digital content as having been re-scanned after the second scan is performed, wherein a subsequent scan will not be performed on the digital content identified as having been re-scanned.
12. A mail server comprising:
a content filter comprising a first list of signatures that identifies email messages that are known to include unwanted content, wherein the content filter performs a first scan on incoming email messages to determine whether a signature associated with each incoming email message is included on the first list of signatures, the first list of signatures being updated with at least one additional signature to comprise a second list of signatures that identifies email messages that are known to include unwanted content; and
a mail store comprising a plurality of mail boxes for storing the email messages after the first scan is performed,
wherein the content filter executes a plurality of scanning threads each performing a second scan on the email messages in a corresponding mail box to determine whether a signature associated with each scanned email message is included on the second list of signatures.
13. The mail server of claim 12 wherein:
in the event that the first scan determines that a signature associated with an email message is not included in the first list of signatures, the email message is stored in an inbox folder of the corresponding mail box, and
in the event that the second scan determines that the signature associated with the email message is included in the second list of signatures, the email message is moved from the inbox folder to a junk folder of the corresponding mail box.
14. The mail server of claim 12 wherein in the event that the second scan determines that the signature associated with the email message is included in the second list of signatures, the email message is discarded.
15. The mail server of claim 12 wherein an email message is identified as having been re-scanned after the second scan is performed such that a subsequent scan will not be performed on the email message identified as having been re-scanned.
16. The mail server of claim 12 wherein at least two scanning threads are executed substantially simultaneously.
17. The mail server of claim 12 wherein the plurality of scanning threads each perform the second scan by an executing algorithm, the plurality of scanning threads not all executing the same algorithm.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for transmitting and receiving a signal at a relay node (RN) in a wireless communication system, the method comprising:
receiving information indicating a link mode in which the relay node will operate among a plurality of link modes; and
transmitting the signal to at least one of a base station (BS) and a user equipment (UE) or receiving the signal from at least one of the base station and the user equipment based on the received information;
wherein the plurality of link modes includes:
a first mode in which all antennas of the RN are available for a backhaul link only and the RN simultaneously performs a transmission in the backhaul link using all of the antennas of the RN at a first frequency and a reception in the backhaul link using all of the antennas of the RN at a second frequency other than the first frequency,
a second mode in which all of the antennas are available for an access link only and the RN simultaneously performs a transmission in the access link using all of the antennas of the RN at the first frequency and a reception in the access link using all of the antennas of the RN at the second frequency,
a third mode in which all of the antennas are available for transmission only and the RN simultaneously performs a transmission in the backhaul link using half of the antennas of the RN at the first frequency and a transmission in the access link using a remaining half of the antennas of the RN at the second frequency, and
a fourth mode in which all of the antennas are available for reception only and the RN simultaneously performs a reception the backhaul link using the half of the antennas of the RN at the first frequency and a reception in the access link using the remaining half of the antennas of the RN at the second frequency,
wherein if the RN switches from the first mode to the third mode, a number of available antennas and a code book used for the backhaul link are changed.
2. The method according to claim 1, wherein the information indicating the link mode in which the relay node will operate corresponds to a subframe configuration information.
3. The method according to claim 1, further comprising switching to the link mode at a subframe indicated by the received information,
wherein the signal is transmitted to or received from at least one of the base station and the user equipment at the subframe according to the switched link mode.
4. The method according to claim 1, wherein, if the received information indicates the first mode, the signal is transmitted to or received from only the base station via the backhaul link.
5. The method according to claim 1, wherein, if the received information indicates the second mode, the signal is transmitted to or received from only the user equipment via the access link.
6. The method according to claim 1, wherein, if the received information indicates the third mode, the signal is transmitted to the base station and the user equipment via the backhaul link and the access link.
7. The method according to claim 1, wherein, if the received information indicates the fourth mode, the signal is received from the base station and the user equipment via the backhaul link and the access link.
8. The method according to claim 1, wherein the received information includes information indicating a predefined codebook table corresponding to a number of transmission antennas available in the link mode or information indicating a feedback mode corresponding to a number of downlink transmission or downlink reception antennas available in the link mode.
9. The method according to claim 8, further comprising selecting a precoding matrix index (PMI) based on the information indicating the codebook table,
wherein the signal to which the selected PMI is applied is transmitted to at least one of the base station and the user equipment.
10. The method according to claim 1, wherein the information is received through higher layer signaling.
11. A relay node (RN) apparatus for transmitting and receiving a signal in a wireless communication system, the RN apparatus comprising:
a plurality of antennas configured to receive information indicating a link mode in which the relay node will operate among a plurality of link modes; and
a processor configured to control the plurality of antennas to transmit or receive the signal to or from at least one of a base station and a user equipment based on the received information;
wherein the plurality of link modes includes:
a first mode in which all of the plurality of antennas are available for a backhaul link only and the RN simultaneously performs a transmission in the backhaul link using all of the antennas of the RN at a first frequency and a reception in the backhaul link using all of the antennas of the RN at a second frequency other than the first frequency,
a second mode in which all of the plurality of antennas are available for an access link only and the RN simultaneously performs a transmission in the access link using all of the antennas of the RN at the first frequency and a reception in the access link using all of the antennas of the RN at the second frequency,
a third mode in which all of the plurality of antennas are available for transmission only and the RN simultaneously performs a transmission in the backhaul link using half of the antennas of the RN at the first frequency and a transmission in the access link using a remaining half of the antennas of the RN at the second frequency, and
a fourth mode in which all of the plurality of antennas are available for reception only and the RN simultaneously performs a reception in the backhaul link using the half of the antennas of the RN at the first frequency and a reception in the access link using the remaining half of the antennas of the RN at the second frequency,
wherein if the RN switches from the first mode to the third mode, a number of available antennas and a code book used for the backhaul link are changed.
12. The RN apparatus according to claim 11, wherein the processor controls switching to the link mode at a subframe indicated by the received information, and the plurality of antennas transmit or receive the signal to or from at least one of the base station and the user equipment according to the switched link mode.
13. The RN apparatus according to claim 11, wherein the information indicating the link mode in which the RN apparatus will operate corresponds to a subframe.
14. The RN apparatus according to claim 11, wherein, if the received information indicates the first mode, the processor controls the plurality of antennas to transmit or receive the signal to or from only the base station via the backhaul link.
15. The RN apparatus according to claim 11, wherein, if the received information indicates the second mode, the processor controls the plurality of antennas to transmit or receive the signal to or from only the user equipment via the access link.
16. The RN apparatus according to claim 11, wherein, if the received information indicates the fourth mode, the processor controls the second number of the plurality of antennas to receive the signal from the base station and the user equipment via the backhaul link and the access link.
17. The RN apparatus according to claim 11, wherein the received information includes information indicating a predefined codebook table corresponding to a number of transmission antennas available in the link mode or information indicating a feedback mode corresponding to a number of downlink transmission or downlink reception antennas available in the link mode.