Communication device and a method for operating a communication device
View Patent ↗A method and device for decreasing the frequency of tracking area update (TAU) procedures triggered by cell reselections in LTE idle mode without sacrificing paging reception success rate consisting of identifying a frequency of a camped cell in LTE idle mode of a first SIM; assigning the current frequency a highest priority irrespective of the system information blocks (SIBs) broadcast by the network; and remaining on the current frequency until: a cell selection reception level value of the camped cell is less than a first predetermined threshold value or a cell selection quality value of the camped cell is less than a second predetermined threshold value.
1. A communication device comprising:
two subscriber identity modules (SIMs);
a radio frequency (RF) transmitter; and
a baseband modem configured to:
identify a frequency of a camped cell of a first SIM of the two SIMs;
assign the frequency a highest priority; and
remain on the frequency until a first of the following occurs:
a cell selection reception level value of the camped cell is less than a first predetermined threshold value,
a cell selection quality value of the camped cell is less than a second predetermined threshold value, or
an identity of another detected cell is on an identity list that the communication device registered with the network, wherein the identity is a tracking area identity (TAI) and the identity list is a TAI list.
2. The communication device of claim 1 , wherein the RF transmitter is an only RF transmitter of the communication device.
3. The communication device of any one of claim 1 , the baseband modem further configured to identify an ongoing communication on a second SIM.
4. The communication device of claim 3 , the baseband modem further configured to conduct the ongoing communication on the single transmitter of the communication device.
5. The communication device of claim 1 , the baseband modem further configured to assign the frequency a highest priority irrespective of an information broadcasted by system information blocks (SIBs).
6. The communication device of claim 1 , wherein the first predetermined threshold value is about 5 decibels (dBS) or fewer.
7. The communication device of claim 1 , wherein the second predetermined threshold value is about 5 decibels (dBs) or fewer.
8. The communication device of claim 1 , wherein the first predetermined threshold value and the second predetermined threshold value are the same value.
9. A communication device comprising:
a first SIM and a second SIM;
a radio frequency unit comprising a single transmitter and a plurality of receivers; and
a baseband modem configured to:
identify a frequency of a camped cell of the first SIM; and
during an ongoing communication for the second SIM, prevent a switch from the camped cell until:
a cell selection reception level value of the camped cell is less than a first predetermined threshold value, or
a cell selection quality value of the camped cell is less than a second predetermined threshold value.
10. The communication device of claim 9 , the baseband modem further configured to assign the frequency a highest priority irrespective of an information broadcasted by system information blocks (SIBs).
11. The communication device of claim 9 , wherein the first predetermined threshold value is about 5 decibels (dBS) or fewer.
12. The communication device of claim 9 , wherein the second predetermined threshold value is about 5 decibels (dBs) or fewer.
13. The communication device of claim 9 , wherein the first predetermined threshold value and the second predetermined threshold value are the same value.
14. A method for a communication device with at least one subscriber identity module (SIM) to suppress a cell reselection on a first SIM, comprising:
identifying a frequency of a cell on which the first SIM is camped on;
assigning the frequency a highest priority; and
remaining on the frequency until a first of the following occurs:
a cell selection reception level value of the cell is less than a first predetermined threshold value,
a cell selection quality value of the cell is less than a second predetermined threshold value, or
an identity of another detected cell is on an identity list that the communication device registered with the network, wherein the identity is a tracking area identity (TAI) and the identity list is a TAI list.
15. The method of claim 14 , wherein the communication device comprises a radio frequency (RF) unit with a single transmitter.
16. The method of claim 14 , further comprising an ongoing communication on a second SIM of the communication device.
17. The method of claim 16 , further comprising the ongoing communication utilizing the single transmitter of the communication device.
18. The method of claim 16 , further comprising wherein the ongoing communication is a voice call.
19. The method of claim 14 , further comprising assigning the frequency the highest priority irrespective of an information broadcasted by system information blocks (SIBs).
20. The method of claim 14 , further comprising wherein the first SIM is in an idle mode on the frequency.
21. The method of claim 14 , further comprising wherein the cell reselection comprises a tracking area (TA) cell reselection.
22. The method of claim 21 , wherein the TA cell reselection triggers a TA update (TAU).
23. The method of claim 14 , wherein the first predetermined threshold value and the second predetermined threshold value are the same value.