Abstract
A method of handling cell reselection includes receiving a first cell reselection configuration message including at least one cell reselection rule from a first cell of the communication system, checking whether the at least one cell reselection rule is satisfied in order to generate a rule ranking list, and selecting one of the plurality of second cells to camp on according to the rule ranking list.
Technologies
Mobility and handover
Product
Use Cases
Wireless communication
Services
Claim
1. A method of handling cell reselection, adapted to a communication device of a communication system, comprising:
receiving a first cell reselection configuration message from a first cell of the communication system, wherein the first cell reselection configuration message comprises at least one cell reselection rule;
checking whether the at least one cell reselection rule is satisfied in order to generate a rule ranking list ranking a plurality of second cells; and
selecting one of the plurality of second cells of the communication system to camp on according to the rule ranking list,
wherein the step of selecting one of the plurality of second cells to camp on according to the rule ranking list comprises:
selecting a plurality of rule candidates with a highest rule priority from the plurality of second cells according to the rule ranking list;
ranking the plurality of rule candidates according to frequency priorities of the plurality of rule candidates in order to generate a frequency ranking list;
ranking a plurality of frequency candidates according to signal strength or signal quality in order to generate a signal ranking list, wherein the plurality of frequency candidates are selected from the plurality of rule candidates according to frequency priorities of the plurality of rule candidates, wherein the frequency priorities of the plurality of frequency candidates are the same and highest; and
selecting one of the plurality of second cells to camp on according to the frequency ranking list or the signal ranking list.
2. The method of claim 1, wherein a cell reselection information maintenance message is transmitted between a plurality of network nodes to update the at least one cell reselection rule, at least one cell reselection threshold or at least one cell reselection value, wherein the plurality of network nodes comprise at least one base station corresponding to the first cell or the plurality of second cells, a server, a controller, and a database.
3. The method of claim 2, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
receiving a first cell reselection information message broadcasted from the first cell, wherein the first cell reselection information message comprises the at least one cell reselection threshold corresponding to the plurality of second cells and a neighboring cell list corresponding to the plurality of second cells;
generating the at least one cell reselection value; and
comparing each of the at least one cell reselection threshold corresponding to one of the plurality of second cells with the at least one cell reselection value in order to determine which of the at least one cell reselection rule is satisfied,
wherein the first cell is a serving cell of the communication device.
4. The method of claim 2, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
receiving a first cell reselection information message broadcasted from the first cell, wherein the first cell reselection information message comprises the at least one cell reselection threshold corresponding to the plurality of second cells and a neighboring cell list corresponding to the plurality of second cells;
calculating a plurality of intervals each corresponding to one of the plurality of second cells according to the at least one cell reselection threshold;
generating the at least one cell reselection value; and
determining which of the plurality of intervals the at least one cell reselection value is bounded in in order to determine which of the at least one cell reselection rule is satisfied,
wherein the first cell is a serving cell of the communication device.
5. The method of claim 2, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
receiving a second cell reselection information message broadcasted from one of the plurality of second cells, wherein the second cell reselection information message comprises the at least one cell reselection threshold corresponding to the plurality of second cells, wherein the second cell broadcasting the second cell reselection information message has a better signal strength or signal quality or higher frequency priority;
generating the at least one cell reselection value; and
comparing each of the at least one cell reselection threshold corresponding to one of the plurality of second cells with the at least one cell reselection value in order to determine which of the at least one cell reselection rule is satisfied.
6. The method of claim 2, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
receiving a second cell reselection information message broadcasted from one of the plurality of second cells, wherein the second cell reselection information message comprises the at least one cell reselection threshold corresponding to the plurality of second cells, wherein the second cell broadcasting the second cell reselection information message has a better signal strength or signal quality or higher frequency priority;
calculating a plurality of intervals each corresponding to one of the plurality of second cells according to the at least one cell reselection threshold;
generating the at least one cell reselection value; and
determining which of the plurality of intervals the at least one cell reselection value is bounded in in order to determine which of the at least one cell reselection rule is satisfied.
7. The method of claim 2, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
receiving a plurality of second cell reselection information messages broadcasted from the plurality of second cells, wherein the plurality of second cell reselection information messages comprises the at least one cell reselection value respectively; and
comparing each of the at least one cell reselection value corresponding to one of the plurality of second cells with the at least one cell reselection threshold in order to determine which of the at least one cell reselection rule is satisfied,
wherein the first cell reselection configuration message further comprises the at least one cell reselection threshold.
8. The method of claim 2, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
receiving a plurality of second cell reselection information messages broadcasted from the plurality of second cells, wherein the plurality of second cell reselection information messages comprises the at least one cell reselection threshold respectively; and
generating the at least one cell reselection value; and
comparing each of the at least one cell reselection threshold corresponding to one of the plurality of second cells with the at least one cell reselection value in order to determine which of the at least one cell reselection rule is satisfied.
9. The method of claim 1, wherein the at least one cell reselection rule comprises at least one of a loading cell reselection rule, a capability cell reselection rule, a mobility cell reselection rule, a subscriber class cell reselection rule, a signal cell reselection rule and a constant cell reselection rule.
10. The method of claim 2, wherein the at least one cell reselection threshold comprises at least one of a loading cell reselection threshold, a capability cell reselection threshold, a mobility cell reselection threshold, a subscriber class cell reselection threshold, a signal cell reselection threshold and a constant cell reselection threshold, wherein the at least one cell reselection value comprises at least one of a loading cell reselection value, a capability cell reselection value, a mobility cell reselection value, a subscriber class cell reselection value, a signal cell reselection value and a constant cell reselection value.
11. The method of claim 1, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
ranking the plurality of second cells according to signal strength or signal quality in order to generate a signal ranking list; and
checking whether the at least one cell reselection rule is satisfied in an order of the signal ranking list in order to generate the rule ranking list.
12. The method of claim 1, wherein the step of checking whether the at least one cell reselection rule is satisfied in order to generate the rule ranking list comprises:
ranking the plurality of second cells according to a number of the at least one cell reselection rule satisfied in order to generate the rule ranking list.
13. The method of claim 1, further comprising:
selecting one of the plurality of second cells to camp on according to a default frequency when none of the at least one cell reselection rule is satisfied, and
selecting one of the plurality of second cells to camp on according to frequency priorities of the plurality of second cells when none of the at least one cell reselection rule is satisfied and when none of the plurality of second cells is operated on the default frequency.
14. The method of claim 2, wherein the first cell reselection configuration message or a first cell reselection information message or the plurality of second cell reselection information messages comprises at least one of a default frequency, a frequency list, a rule validity timer of the at least one cell reselection rule, a threshold validity timer of the at least one cell reselection threshold and a value validity timer of the at least one cell reselection value.
15. The method of claim 14, wherein an exceptional scenario occurs when the communication device is not capable of performing cell reselection according to the frequency list, the at least one cell reselection rule or the default frequency, when the rule validity timer, the threshold validity timer or the value validity timer is expired, or when the at least one cell reselection threshold or the at least one cell reselection value received by the communication device does not match the at least one cell reselection rule stored in the communication device.
16. The method of claim 15, wherein the rule validity timer, the threshold validity timer or the value validity timer is activated when the communication device receives the rule validity timer, the threshold validity timer or the value validity timer.
17. The method of claim 15, further comprising:
selecting a fourth cell to camp on from the first cell and the plurality of second cells according to the default frequency or the frequency list when the exceptional scenario occurs;
transmitting a communication device report message or an event report message to the fourth cell in order to make the at least one cell reselection rule, the at least one cell reselection threshold or the at least one cell reselection value adjusted by the plurality of network nodes; and
receiving a second cell reselection configuration message corresponding to the communication device report message or an event response message corresponding to the event report message from the fourth cell to update the at least one cell reselection rule, the at least one cell reselection threshold or the at least one cell reselection value;
wherein the communication device report message comprises cell information stored in the communication device, wherein the cell information comprises a blacklist or a cell ID plus frequency, wherein the event report message is configured to indicate the communication device has no cell to camp on.
18. The method of claim 17, wherein the communication device transmits the event report message without entering a connected mode.
19. The method of claim 15, further comprising:
flushing cell information stored in the communication device; and
performing cell reselection according to the frequency list or the default frequency.
20. The method of claim 17, wherein the cell information stored in the communication device is released when the communication device completes cell reselection, when the communication device enters a connected mode, or when the rule validity timer, the threshold validity timer or the value validity timer is expired.
21. A communication device, comprising:
a storage unit, configured to store a program code; and
a processing unit, configured to execute the program code to perform operations comprising:
receiving a first cell reselection configuration message from a first cell of the communication system, wherein the first cell reselection configuration message comprises at least one cell reselection rule;
checking whether the at least one cell reselection rule is satisfied in order to generate a rule ranking list ranking a plurality of second cells; and
selecting one of the plurality of second cells of the communication system to camp on according to the rule ranking list,
wherein selecting one of the plurality of second cells to camp on according to the rule ranking list comprises:
selecting a plurality of rule candidates with a highest rule priority from the plurality of second cells according to the rule ranking list;
ranking the plurality of rule candidates according to frequency priorities of the plurality of rule candidates in order to generate a frequency ranking list;
ranking a plurality of frequency candidates according to signal strength or signal quality in order to generate a signal ranking list, wherein the plurality of frequency candidates are selected from the plurality of rule candidates according to frequency priorities of the plurality of rule candidates, wherein the frequency priorities of the plurality of frequency candidates are the same and highest; and
selecting one of the plurality of second cells to camp on according to the frequency ranking list or the signal ranking list.
Associated Portfolios
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Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.