Apparatus and method for cell reselection in a radio access network
View Patent ↗A method for cell reselection from a serving cell to another cell in a radio access network covering a geographical area divided into a plurality of cells, the method comprising: attempting to reselect to a first other cell with a higher rank value than the serving cell; setting up a channel on the first other cell and initiating a completion period; conditional on the completion period expiring before the first other cell is identified as being a suitable cell, receiving cell measurements for cells and creating a cell ranking list of the cells based on rank values of the cells; conditional on a second other cell having a higher rank value than the serving cell or first other cell, attempting to reselect to the second other cell.
1. A method for cell reselection from a serving cell to another cell in a radio access network covering a geographical area divided into a plurality of cells, the method comprising:
attempting to reselect to a first other cell with a higher rank value than the serving cell;
setting up a channel on the first other cell and initiating a predetermined completion period for camping on the first cell;
dynamically reporting cell measurements for cells and creating a cell ranking list of the cells based on rank values of the cells;
conditional on the completion period not expiring before identifying the first cell as suitable:
camping on the first cell;
conditional on the completion period expiring before the first other cell is identified as suitable;
attempting to reselect to a second other cell having a higher rank value than the first cell or serving cell.
2. A method according to claim 1 , further comprising:
conditional on the first other cell having the highest rank value, reading system information from the first other cell and checking that the first other cell is a suitable cell.
3. A method according to claim 1 , further comprising:
conditional on the serving cell having the highest rank value, receiving cell measurements for cells, creating a cell ranking list of the cells based on rank values of the cells and checking that the serving cell has the highest rank value.
4. A method according to claim 1 , wherein the cell measurements are intra-frequency, inter-frequency and inter RAT cell measurements.
5. A method according to claim 1 , wherein the rank values are calculated for the serving cell and neighbouring cells.
6. A method according to claim 1 , wherein the channel is PCCPCH.
7. A method according to claim 1 , wherein the completion period is a predetermined period of time.
8. A method according to claim 1 , wherein the completion period is defined by the occurrence of predetermined number of defined events.
9. A mobile communication device for use in a radio access network covering a geographical area divided into a plurality of cells, comprising:
one or more processors;
a wireless transceiver coupled to the one or more processors;
memory coupled to the one or more processors;
the one or more processors being operative to:
attempt to reselect to a first other cell with a higher rank value than the serving cell;
set up a channel on the first other cell and initiating a predetermined completion period for camping on the first cell;
dynamically report cell measurements for cells and create a cell ranking list of the cells based on rank values of the cells;
conditional on the completion period not expiring before identifying the first cell as suitable:
camp on the first cell; and
conditional on the completion period expiring before the first other cell is identified as suitable:
attempt to reselect to a second other cell having a higher rank value than the first cell or serving cell.
10. A mobile communication device according to claim 9 , wherein the one or more processors are further operative to:
read, conditional on the first other cell having the highest rank value, system information from the first other cell and check that the first other cell is a suitable cell.
11. A mobile communication device according to claim 9 , wherein the one or more processors are further operative to:
create, conditional on the serving cell having the highest rank value, receiving cell measurements for cells, a cell ranking list of the cells based on rank values of the cells and check that the serving cell has the highest rank value.
12. A mobile communication device according to claim 9 , wherein the cell measurements are intra-frequency, inter-frequency and inter RAT cell measurements.
13. A mobile communication device according to claim 9 , wherein the rank values are calculated for the serving cell and neighbouring cells.
14. A mobile communication device according to claim 9 , wherein the channel is PCCPCH.
15. A mobile communication device according to claim 9 , wherein the completion period is a predetermined period of time.
16. A mobile communication device according to claim 9 , wherein the completion period is defined by the occurrence of predetermined number of defined events.
17. A computer program product comprising program code stored on a non-transitory computer readable medium, the program code arranged, in use, to:
attempt to reselect to a first other cell with a higher rank value than the serving cell;
set up a channel on the first other cell and initiating a predetermined completion period for camping on the first cell;
dynamically report cell measurements for cells and create a cell ranking list of the cells based on rank values of the cells;
conditional on the completion period not expiring before identifying the first cell as suitable:
camp on the first cell; and
conditional on the completion period expiring before the first other cell is identified as suitable:
attempt to reselect to a second other cell having a higher rank value than the first cell or serving cell.