Abstract
A method for performing cell reselection first determines a current cell selection quality value. The cell selection quality value is compared to a predetermined threshold. Measurements of neighboring cells are taken if the cell selection quality value is less than or equal to the predetermined threshold. Measurements can be taken of intra-frequency cells inter-frequency cells and inter-radio access technology cells. If a neighboring cell is found that is better than the current cell based on the measurements then the better neighbor cell is reselected to.
A method for performing cell reselection first determines a current cell selection quality value. The cell selection quality value is compared to a predetermined threshold. Measurements of neighboring cells are taken if the cell selection quality value is less than or equal to the predetermined threshold. Measurements can be taken of intra-frequency cells inter-frequency cells and inter-radio access technology cells. If a neighboring cell is found that is better than the current cell based on the measurements then the better neighbor cell is reselected to.
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| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
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| EP2782394B1 | ----- | ----- | ----- | ----- | ----- | ----- | ----- | |||
| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Mobility and handover
Product
Not Available
Use Cases
Wireless communication
Services
Not Available
Claim
1. A method for performing cell reselection, comprising: determining a current cell selection quality value; comparing the cell selection quality value to a predetermined threshold; taking measurements of neighboring cells if the cell selection quality value is less than or equal to the predetermined threshold; and if a neighboring cell better than the current cell is found based on the measurements, then reselecting to the better neighbor cell.
2. The method according to claim 1, wherein the cell selection quality value is a difference between a reference symbol received quality and a minimum required quality level in the cell.
3. The method according to claim 1, wherein the threshold is a threshold for triggering intra-frequency measurements; and the measurements taken are of neighboring intra-frequency cells.
4. The method according to claim 1, wherein the threshold is a threshold for triggering inter-frequency measurements; and the measurements taken are of neighboring inter-frequency cells.
5. The method according to claim 1, wherein the threshold is a threshold for triggering intra-frequency measurements; and the measurements taken are of neighboring intra-frequency cells and neighboring inter-frequency cells in parallel.
6. The method according to claim 1, wherein the measurements taken are of neighboring intra-frequency cells and neighboring inter-frequency cells in parallel if the cell selection quality value is less than or equal to a threshold for triggering intra-frequency measurements and is less than or equal to a threshold for triggering inter-frequency measurements.
7. The method according to claim 1, wherein the threshold is a threshold for triggering inter-radio access technology (RAT) measurements; and the measurements taken are of neighboring inter-RAT cells.
8. The method according to claim 7, wherein the inter-RAT measurements are taken only if there are no suitable neighboring intra- frequency cells or neighboring inter-frequency cells.
9. The method according to claim 7, wherein a different inter-RAT triggering threshold is used for each supported RAT
10. The method according to claim 7, further comprising: waiting for a predetermined period of time between two consecutive measurements
11. The method according to claim 10, wherein the predetermined period of time is based on a number of discontinuous reception (DRX) cycles
12. The method according to claim 11, further comprising: taking measurements on the inter-RAT cells if the current cell fails a predetermined criteria for a predetermined number of consecutive DRX cycles
13. The method according to claim 12, wherein the predetermined criteria is an S criteria
14. The method according to claim 13, wherein the S criteria is defined by the formula:', 'Srxlev = RSRP - Qrxlevmin - max(UE_TXPWR_MAX_RACH - P_MAX, 0) where Srxlev is a cell selection reception level, RSRP is a reference symbol received power, Qrxlevmin is a minimum required reception level in the cell, UE_TXPWR_MAX_RACH is a maximum power level that a wireless transmit/receive unit (WTRU) may use when accessing the cell on a random access channel, and P_MAX is a maximum radio frequency output power of the WTRU
15. The method according to claim 14, wherein the RSRP value is measured by the WTRU and Qrxlevmin and UE_TXPWR_MAX_RACH are received from a network
16. The method according to claim 10, wherein the predetermined period of time is received by a wireless transmit/receive unit (WTRU) from the network
17. The method according to claim 16, wherein multiple predetermined period of time values are received by the WTRU from the network and the WTRU selects a predetermined period of time value based on current channel conditions
18. The method according to claim 16, further comprising: receiving a scaling factor, the scaling factor being multiplied by the predetermined period of time value to adjust the measurement interval based on current channel conditions
19. The method according to claim 7, further comprising searching for an inter-RAT cell.
20. The method according to claim 19, wherein the searching comprises: measuring cells in at least one RAT; comparing the measured cells from all RATs against a minimum quality threshold; selecting the cells that exceed the threshold, regardless of RAT; and ranking the selected cells based on the measurements.
21. The method according to claim 20, wherein a different minimum quality threshold is used for each RAT.
22. The method according to claim 20, wherein the ranking is repeatedly performed on a predetermined interval.
23. The method according to claim 22, wherein the predetermined interval is based on a number of discontinuous reception (DRX) cycles.
24. The method according to claim 20, further comprising: reselecting to a strongest cell from among all the RATs.
25. The method according to claim 7, further comprising: receiving priority information for the RATs, wherein the priority information is used to determine an order for measuring the inter-RAT cells.
26. The method according to claim 25, wherein the priority information includes at least one of: RAT information, frequency information, and cell information.
27. The method according to claim 1, wherein if the predetermined threshold is not available, then neighboring cells are always measured.']
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
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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.
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