KR100862997B1 - Improving intersystem cell reselection from GERAN to UTRAN - Google Patents

Abstract

The present invention is supported by a universal terrestrial radio access network (UTRAN) by a mobile station from a service GERAN cell supported by a global system for mobile communications / enhanced data rates for GSM evolution (GSM / EDGE) radio access network (GERAN). A cell reselection method to a UTRAN cell is described. According to the first embodiment of the present invention, the intended intersystem reselection operation is performed without changing the signaling. This may be the preferred mode for early implementation, because signaling changes always take longer to reach products on the field (update of both mobile and network is desired). According to the second embodiment of the present invention, the flexibility of the signaling change is utilized as one advantage.

Description

Improving intersystem cell reselection from WENRAN to WRTANN {Improving intersystem cell reselection from GERAN to UTRAN}

Cross Reference to Related Application

This application claims priority to US Patent Provisional Application No. 60 / 578,639, filed June 10, 2004, and US Patent Application No. 11 / 129,673, filed May 13, 2005.

The present invention relates to intersystem reselection optimization of mobile communication systems, and more particularly, to cell reselection from GERAN to UTRAN.

Existing 2G to 3G cell reselections include the universal terrestrial radio access network (UTRAN) common pilot channel (CPICH) Ec / No (receive energy per PN chip from the CPICH versus the total received power spectral density at the antenna connector of the mobile station). Based on the threshold of UTRAN CPICH RSCP (received signal code power) for a GERAN (GSM / EDGE radio access network) serving cell RXLEV (received signal level). In addition, cell reselection towards UTRAN may be inhibited if the UTRAN target cell suitability criteria S (Srxlev> 0 and Squal> 0) are not satisfied (reselection may still be caused).

TeliaSonear proposed a signaling change based on improvements through the new threshold of UTRAN CPICH RSCP to control reselection from GERAN to UTRAN in addition to existing parameters ((1) April 19-23, 2004 Mexico Change Request 45.008 CR 205 #GPP TSG-GERAN 19th Conference in Cancun Tdoc GP-040586 (2) Tdoc GP-040586 "WCDMA uplink and CPICH Ec / Io downlink Background ", (3) 10.06.04 Suggested Document by Ari-Pekka Salovaara" Necessity of Research to Change Cell Reselection Specification ").

At present, there is no threshold of the minimum allowable UTRAN CPICH RSCP signaled via global system for mobile communications (GSM) upon reselection from GERAN to UTRAN cell. As a result, whenever a UTRAN cell is suitable, it is impossible for the mobile station to apply an aggressive reselection behavior that attempts to reselect available UTRAN cells (practical hysteresis to avoid ping-pong). .

More specifically, if the reselection is controlled only with the existing Ec / No threshold (by setting the RSCP to RXLEV offset criterion to "minus infinity", i.e. with the serving cell RSS [received signal strength indicator] vs. the target cell RSCP) By allowing reselection irrespective], the mobile can reselect those UTRAN cells that are not loaded from too far away (especially when the UTRAN cell is at the edge of the UTRAN coverage area) where the uplink fails. , While setting the Ec / No threshold high enough (to ensure uplink access), the mobile station may not have access to the loaded UTRAN cell at all, or at least the mobile station may not be able to access the target UTRAN as intended through the network plan. You may need to go much closer.

The source of the problem is that, as described in the above TeliaSonera documents, the UTRAN CPICH Ec / No varies greatly depending on the load of the UTRAN cell, especially the cell at the edge of the UTRAN application area. This allows the mobile station to reselect the UTRAN cell whenever the uplink and downlink are operational (basically both UTRAN CPICH RSCP and Ec / No are at sufficient levels) while the uplink is guaranteed to operate. It makes the reselection that occurs at the point where it exists. Within the conformance criteria of the UTRAN, a minimum CPICH RSCP based threshold is included.

An object of the present invention is to provide a universal terrestrial radio access network (UTRAN) from a serving GERAN cell, supported by a global system for mobile communications / enhanced data rates for GSM evolution (GSM / EDGE) radio access network (GERAN), It is to provide a method for cell reselection by a mobile station.

According to the first embodiment of the present invention, the intended intersystem reselection operation is performed without changing the signaling. This may be the preferred mode for early implementation, since signaling changes always take a long time to reach products on the field (both mobile and network updates are normally required). According to the second embodiment of the present invention, the flexibility of the signaling change is exploited to advantage, so that the change is planned to be supported less urgently by the mobiles and the network device.

According to a first aspect of the present invention, in a serving cell supported by a first wireless access technology by a mobile station, a method for cell reselection to a cell supported by a second wireless access technology may include a second wireless access technology. Selecting a previous cell supported by and reading and storing an RSCP conformance threshold from the previous cell; Selecting a serving cell by the mobile station; And setting a reselection criterion by the mobile station to reselect a cell in the serving cell, the reselection criterion having an offset defined by the mobile station using a predetermined criterion in addition to the RSCP conformance threshold. At least one threshold.

According to a first aspect of the invention, the serving cell may be a serving GERAN cell, the cell may be a UTRAN cell, the previous cell may be a previous UTRAN cell, and the first radio access technology is GSM / EDGE radio access network (GERAN), the second radio access technology may be a universal terrestrial radio access network (UTRAN), and the RSCP compliance threshold may be a UTRAN RSCP compliance threshold. The method may also include determining if the reselection criteria are satisfied for the UTRAN cell, and if it is satisfied, reselecting the UTRAN cell by the mobile station. In addition, prior to the step of selecting the serving GERAN cell, the method may include selecting the previous UTRAN cell and reading and storing the UTRAN RSCP conformance threshold from the previous UTRAN cell. In addition, the offset may include a hysteresis value or may be defined using the power capacity of the mobile station.

A computer program product according to a second aspect of the invention comprises a computer readable storage structure for implementing computer program code to be executed by a computer processor, the computer program code comprising a mobile station, a GSM / EDGE radio access network (GERAN Or instructions for performing the steps of the first aspect of the present invention indicated to be performed by either component of a universal terrestrial radio access network (UTRAN).

According to a third aspect of the invention, in a service cell supported by a first wireless access technology by a mobile station, a method for cell reselection to a cell supported by a second wireless access technology is provided by a mobile station. Selecting a cell; And setting first and second reselection criteria by a mobile station to select the cell in the serving cell, wherein the first reselection criterion is energy received per PN chip from a common pilot channel (CPICH). A threshold comprising an offset added to the ratio by the mobile station in addition to the ratio of the total received power spectral density (Ec / No) at the antenna connector of the mobile station, the second reselection criterion being an RSCP threshold. And the offset of the ratio and the RSCP threshold are provided to the mobile station by the serving cell.

According to a third aspect of the invention, the serving cell may be a serving GERAN cell, the cell may be a UTRAN cell, the previous cell may be a previous UTRAN cell, and the first radio access technology is GSM / EDGE radio access network (GERAN), the second radio access technology may be a universal terrestrial radio access network (UTRAN), and the RSCP threshold may be a UTRAN RSCP threshold. The method may also include determining whether the first and second reselection criteria are satisfied for the UTRAN cell, and if it is satisfied, reselecting the UTRAN cell by the mobile station. In addition, the UTRAN RSCP threshold may include a hysteresis value or may be defined using the power capacity of the mobile station.

A computer program product according to a fourth aspect of the invention comprises a computer readable storage structure for implementing computer program code to be executed by a computer processor, the computer program code comprising a mobile station, a GSM / EDGE radio access network (GERAN Or instructions for performing the steps of the third aspect of the present invention indicated to be performed by either component of a universal terrestrial radio access network (UTRAN).

According to a fifth aspect of the invention, there is provided a mobile station capable of cell reselection from a serving cell supported by a first wireless access technology to a cell supported by a second wireless access technology, wherein the second wireless A receive / transmit / processing module for providing a received threshold signal indicative of an RSCP conformance threshold in response to a threshold signal indicative of an RSCP conformance threshold from a previous cell supported by the access technology; And a cell reselection block for setting a reselection criterion for reselecting a cell from a serving cell in response to the received threshold signal indicating an RSCP conformance threshold, wherein the reselection criterion is a cell reselection in addition to the RSCP conformance threshold. It includes at least one threshold having an offset defined by a predetermined criterion by a selection block.

According to a fifth aspect of the invention, the serving cell may be a serving GERAN cell, the cell may be a UTRAN cell, the previous cell may be a previous UTRAN cell, and the first radio access technology is GSM / EDGE radio access network (GERAN), the second radio access technology may be a universal terrestrial radio access network (UTRAN), and the RSCP compliance threshold may be a UTRAN RSCP compliance threshold. Further, the cell reselection block may determine whether a reselection criterion is satisfied for the UTRAN cell, and if the criterion is satisfied, reselect the UTRAN cell by the mobile station. In addition, the offset may include a hysteresis value or may be defined using the power capacity of the mobile station. The mobile station may also include a memory for storing the UTRAN RSCP conformance threshold.

According to a sixth aspect of the present invention, in a serving cell supported by the first wireless access technology, a mobile station capable of cell reselection to one cell supported by the second wireless access technology includes an RSCP threshold and a common pilot channel. In response to a signal indicating an offset of the ratio (Ec / No) of the received energy per PN chip to the total received power spectral density (Ec / No) at the antenna connector of the mobile station from CPICH, the received signal indicating the RSCP threshold and the offset of the ratio A receive / transmit / processing module for providing; And a cell reselection block for setting first and second reselection criteria for reselecting a cell from the serving cell in response to a received signal indicating a UTRAN RSCP threshold and an offset of the ratio; The selection criterion includes a threshold comprising an offset added to the ratio by the mobile station in addition to the ratio Ec / No, and the second reselection criterion comprises an RSCP threshold.

According to a sixth aspect of the invention, the serving cell may be a serving GERAN cell, the cell may be a UTRAN cell, the previous cell may be a previous UTRAN cell, and the first radio access technology is GSM / EDGE radio access network (GERAN), the second radio access technology may be a universal terrestrial radio access network (UTRAN), the RSCP compliance threshold may be a UTRAN RSCP compliance threshold, the signal may be a GERAN signal The received signal may be a GERAN received signal. Further, the cell reselection block may determine whether the first and second reselection criteria are satisfied for the UTRAN cell, and if the criteria are satisfied, reselect the UTRAN cell by the mobile station. In addition, the UTRAN RSCP threshold may include a hysteresis value or may be defined using the power capacity of the mobile station. The mobile station may also include a memory for storing the UTRAN RSCP threshold, the ratio and offset.

According to a seventh aspect of the present invention, a system using cell reselection from a GSM / EDGE radio access network (GERAN) to a universal terrestrial radio access network (UTRAN) is supported by a universal terrestrial radio access network to provide a UTRAN RSCP conformance threshold. A previous UTRAN cell providing a threshold signal indicating a; A serving GERAN cell supported by the GSM / EDGE radio access network; UTRAN cell supported by a universal terrestrial radio access network; And a mobile station for setting reselection criteria for reselecting a UTRAN cell from a serving GERAN cell in response to a threshold signal indicating a UTRAN RSCP conformance threshold, wherein the reselection criterion is used using a predetermined criterion in addition to the UTRAN RSCP conformance threshold. It includes at least one threshold with an offset defined by the mobile station.

According to a seventh aspect of the invention, the mobile station can determine whether the reselection criteria are satisfied for the UTRAN cell and, if so, reselect the UTRAN cell.

According to an eighth aspect of the invention, a system using cell reselection from a GSM / EDGE radio access network (GERAN) to a universal terrestrial radio access network (UTRAN) comprises: a UTRAN cell supported by a universal terrestrial radio access network; The ratio Ec in response to the GERAN signal indicating an offset of the ratio (Ec / No) of the received energy per PN chip from the UTRAN RSCP threshold and the common pilot channel (CPICH) to the total received power spectral density at the antenna connector of the mobile station. Mobile station setting a first reselection criterion comprising a threshold having an offset added to the ratio by the mobile station in addition to a second reselection criterion, which may include a UTRAN RSCP threshold; And a service GERAN cell 20-1-A supported by the GSM / EDGE radio access network to provide the GERAN signal, wherein the mobile station determines that the first and second reselection criteria are satisfied for the UTRAN cell. If so, the UTRAN cell is reselected from the serving GERAN cell by the mobile station.

According to a ninth aspect of the invention, an integrated circuit capable of performing cell selection from a service GERAN cell supported by a GSM / EDGE radio access network (GERAN) to a UTRAN cell supported by a universal terrestrial radio access network (UTRAN) is provided. A receive / transmit / processing module for providing a received threshold signal indicative of a UTRAN RSCP conformance threshold in response to a threshold signal indicative of a UTRAN RSCP conformance threshold from a previous UTRAN cell supported by the universal radio access network; And a cell reselection block for setting a reselection criterion for reselecting a UTRAN cell from a service GERAN cell in response to the received threshold signal indicating a UTRAN RSCP conformance threshold, wherein the reselection criterion is the UTRAN RSCP conformance threshold. In addition, the cell reselection block includes at least one threshold having an offset defined using a predetermined criterion.

According to a tenth aspect of the present invention, an integrated circuit mobile capable of performing cell selection from a service GERAN cell supported by a GSM / EDGE radio access network (GERAN) to a UTRAN cell supported by a universal terrestrial radio access network (UTRAN). The station is a GERAN signal from a service GERAN cell indicating an offset of the ratio of the received energy spectral density (Ec / No) at the antenna connector of the integrated circuit to the received energy per PN chip from the UTRAN RSCP threshold and the common pilot channel (CPICH). In response, receive / transmit / process module to provide a received GERAN signal indicating an UTRAN RSCP threshold and an offset of the ratio; And a cell reselection block for setting first and second reselection criteria for reselecting a UTRAN cell from the serving GERAN cell in response to a received GERAN signal indicating a UTRAN RSCP threshold and an offset of the ratio; The first reselection criterion includes a threshold including an offset added to the ratio in addition to the ratio Ec / No, and the second reselection criterion includes a UTRAN RSCP threshold.

An advantage of the first mode of the present invention is that it is possible to achieve substantially the same operation as proposed in the prior art, without a signaling change. This may not be possible to add new parameters (e.g. intersystem reselection parameters) as the capacity for broadcasting system information by GERAN is already full, and if these parameters are still added, It is also advantageous in that it may make future expansion more important.

The advantage of the second mode is that in addition to being able to reach the exact same mobile aspect as in the case of the improvement proposed in the prior art, the network is capable of both old terminals (only following existing reselection rules) and new terminals. It can be controlled properly. Normally the CPICH Ec / No threshold should be set somewhat higher for older terminals to prevent mobile stations from reselecting UTRAN cells that are not loaded periodically, while new mobiles may use a more aggressive Ec / No threshold ( There is no risk of uplink failure because it is controlled with the new RSCP threshold).

The scheme of the present invention is also more precise because the uplink failure will depend on the mobile station output power capacity. Lower RSCP thresholds should be accommodated in the best case for mobile stations with higher output power capability.

In order to better understand the nature and objects of the present invention, reference will be made to the following detailed description in conjunction with the following drawings.

1 is a system block diagram illustrating one embodiment for cell reselection from a GERAN cell to a UTRAN cell by a mobile station, in accordance with the present invention;

2 is a flow diagram illustrating an embodiment of cell reselection from a GERAN cell to a UTRAN cell by a mobile station, in accordance with the present invention.

3 is a flow diagram illustrating another embodiment of cell reselection from a GERAN cell to a UTRAN cell by a mobile station, in accordance with the present invention.

The present invention proposes a new method of cell reselection by a mobile station from a service GERAN cell supported by a GSM / EDGE radio access network (GERAN) to a UTRAN cell supported by a universal terrestrial radio access network (UTRAN).

According to the first embodiment of the present invention, the intended intersystem reselection operation is performed without changing the signaling. In a first embodiment of the present invention, the intersystem reselection threshold is advantageously obtained using the target UTRAN cell suitability criteria. Whenever reselection is triggered by existing reselection parameters, the mobile station will first need to read its target cell system information to evaluate the conformance criteria for the target cell. According to the present invention, in any reselection attempt for which reselection was first triggered but no target cell conformance criteria were obtained, the mobile station would store the RSCP conformance criteria (or UTRAN RSCP conformance criteria) for that particular cell. This value (ie RSCP conformance criteria) is now available for this particular UTRAN cell and reselection, with the option that it can be transformed via an offset (e.g. using hystereis values or taking into account mobile station power capabilities). Can be used as additional reselection criteria for other UTRAN cells to be evaluated. The offset (eg, hysteresis value) may be fixed by some criterion to avoid signaling changes, otherwise new parameters may be added or other feasible hysteresis parameters may be used for this purpose.

In general, the reselection criteria are updated periodically so that the mobile station knows the new values when the network starts broadcasting the modified values. The applicability of the stored UTRAN values may be limited to the same time period, but it is desirable that their validity is not time dependent. If the mobile station continues to use UTRAN parameter values (once read) after the change of broadcast values (this is already happening today for a limited period of time), the likelihood of change will be small and the performance degradation will be negligible. The relatively long validity period will usually allow the mobile station to avoid repeatedly reading parameters from the same candidate cell when there is a possibility that the mobile station will move to the area of other cells. Preferred validity triggers will still be triggers based on events such as reselection or location region changes. According to the second embodiment of the present invention, the flexibility of the signaling change is utilized as a benefit. In the second embodiment of the present invention, not only the threshold for URTAN CPICH RSCP is added to the reselection criteria, but also the offset of UTRAN CPICH Ec / No is added to reselect by mobile stations supporting the new UTRAN RSCP threshold. Used for evaluation. It is also proposed that, unlike the prior art, hysteresis and / or mobile station output capability is considered in RSCP acceptance criteria in order to allow mobile stations to overcome different output power capabilities.

Thus, in the first embodiment, additional memory in the mobile station for the UTRAN RSCP conformance threshold for a certain number (at least one) of UTRAN cells needs to be implemented. In the second embodiment, the mobile station must be upgraded to support new reselection parameters.

1 is an example of a system block diagram illustrating one embodiment for cell reselection from a GERAN cell to a UTRAN cell by the mobile station 10 in accordance with the present invention.

In the example of FIG. 1, the mobile station 10 includes a cell reselection block 14, a memory 12, and a transmitter / receiver / processing module 16. The cell reselection block 14 is a key block for implementing the present invention, in which all steps performed by the mobile station 10 in connection with cell reselection may be coordinated and generated by the cell reselection block 14.

In accordance with the present invention, block 14 may be implemented in software or hardware blocks, or a combination thereof. In addition, block 14 may be implemented as a separate block or combined with any other standard block of mobile station 10. The cell reselection block 14 uses the memory 12 to store and retrieve the relevant cell information described herein. Again, the memory 12 may be implemented in a variety of ways. This may be part of the general memory of the mobile station 10 or it may be a separate dedicated area (eg, a subscriber identity module (SIM), etc.). Finally, mobile station 10 includes a transmitter / receiver / processing block 16 that may be implemented as a plurality of methods well known in the art. Typically module 16 may include a transmitter, receiver, CPU, I / O block, and so forth. Basically, the module 16 is to provide efficient communication of the network and the cell reselection block 14, as described in detail below.

1 shows at least two sub-networks 20-1 (GERAN type) and 20-2 (UTRAN type) in the wireless sensing geographic area 24 for the mobile device 10. Each of these two sub-networks 20-1 and 20-2 may include several cells, for example, the sub-network 20-1 may contain N cells 20-1-1,. 20-1-A, ..., 20-1-N), and the sub-network 20-2 has N cells (10-2-F ... 20-2-A, ... , 20-2-N). As described in more detail with respect to FIGS. 2 and 3, the mobile station 10 may be a GERAN serving cell (eg, cell 20-1-A) of a sub-network 20-1, or a sub-network 20-. 2) on the UTRAN cell being evaluated for reselection (eg cell 20-1-B), or previously selected (prior to selection of service cell 20-1-A) on the UTRAN cell 20-1-F You can sit for a while.

The network 38 is usually a GERAN serving cell 20-1-A, etc., a list of cells (both GERAN and UTRAN cells) that can be evaluated for reselection from the GERAN serving cell 20-1-A. A network provider (or network operator) 26 that provides (in the context of the present invention) a cell list signal 33 comprising a.

2 shows cell reselection from a GERAN cell (eg, service cell 20-1-A) to a UTRAN cell (eg, UTRAN cell 20-1-B) by mobile station 10 in accordance with the present invention. A flowchart illustrating a first embodiment of the present invention.

The flowchart of FIG. 2 represents only one possible scenario, among others. In the method according to the first embodiment of the present invention, in the first step 40, the mobile station (MS) 10 is temporarily placed in the UTRAN cell (or former UTRAN cell) 20-1-F or "Visit", the conformance criterion is checked (read). In particular, the cell reselection block 14 receives / transmits / processes module 16 in response to a threshold signal 31 (see FIG. 1) indicating a UTRAN RSCP conformance threshold from the UTRAN cells 20-1-F. Provide a received threshold signal 22 (see FIG. 1) indicating the UTRAN RSCP conformance threshold.

In a next step 42, the MS 10 stores RSCP conformance parameters (ie, UTRAN RSCP conformance threshold) for later use (eg, the UTRAN RSCP conformance threshold is stored in the memory 12). If the UTRAN conformance criteria are not satisfied for the UTRAN cell 20-1-F, then in step 46, the MS selects the GERAN cell 20-1-A. In a next step 48, the MS 10 (ie, cell reselection block 14) is updated with system information (eg, pointers to locally available neighbor cells of both GERAN and UTRAN, and also related reselection parameters). (See corresponding signals 30 and 23 in FIG. 1).

In a next step 50, the MSCP threshold (or “threshold”) from the UTRAN conformance parameters (or UTRAN RSCP conformance threshold) previously stored and modified by the offset is stored in MS 10 (ie, cell reselection block 14). Generates); The threshold is used as a reselection criterion from the GERAN cell to the UTRAN. The offset may include a hysteresis value or may be defined (as shown above) using the power capability of the MS 10. In a next step 52 the MS 10 (i.e., the cell reselection block 14) determines the UTRAN CPICh RSCP level and Ec / No (using the criteria set out in step 50) for the UTRAN neighbor cells (the criteria is prior art). And RXLEV for GERAN neighbor cells (selected to be evaluated for reselection) (see signals 32 and 21 of FIG. 1).

In step 54, it is determined whether the reselection criteria are satisfied for the UTRAN or GERAN cells under reselection evaluation. If the reselection criteria (via prior art) is satisfied for the GERAN cell, the process goes to step 46 and the new GERAN cell is reselected. However, if the reselection criteria (set in step 50) are satisfied for the UTRAN cell (eg, cell 20-1-B), the process goes to step 40 and the new UTRAN cell is probably reselected (see step 40 above). ).

3 illustrates cell reselection from a GERAN cell (eg, serving cell 20-1-A) to an UTRAN cell (eg, UTRAN cell 20-1-B) by MS 10, in accordance with the present invention. A flowchart illustrating the second embodiment.

The flowchart of FIG. 3 illustrates only one possible scenario among other things. In the method according to the first embodiment of the present invention, as an initial step 56 the MS 10 selects the GERAN cell 20-1-A and the system information (eg, locally available neighbors of both GERAN and UTRAN). Pointers to cells), and associated reselection parameters are also read (see corresponding signals 30 and 23 of FIG. 1). In particular, the receive / transmit / process module 16 provides the UTRAN RSCP threshold and the ratio of received energy per PN chip from the common pilot channel (CPICH) to the total received power spectral density at the antenna connector of the mobile station (Ec / No). In response to a GERAN signal 30 (see FIG. 1) indicating an offset of, provide a received GERAN signal 23 indicating the offset relative to the UTRAN RSCP threshold and the ratio Ec / No.

In the next step 60, the MS 10 (i.e., cell reselection block 14) is modified by the UTRAN RSCP threshold and the Ec / No offset so that the Ec / No threshold is new devices and old as described above. Evaluate and generate reselection criteria based on the Ec / No threshold, which gives flexibility in controlling the devices separately. The UTRAN RSCP threshold may include a hysteresis value or may be defined using the power capability of the MS 10 (as indicated above).

In a next step 62 (similar to step 52), the MS 10 (i.e., the reselection block 14) determines the UTRAN CPICH RSCP level and (step 60) for the UTRAN neighbor cells (using the criteria set in step 60). CPICH Ec / No is monitored using the criteria set in < RTI ID = 0.0 > and RXLEV < / RTI > for GERAN neighbor cells (selected to be evaluated for reselection).

In step 64, it is determined whether the reselection criteria are satisfied for the UTRAN or GERAN cell under evaluation. If the reselection criteria (via prior art) is satisfied for the GERAN cell, the process goes to step 56 and the new GERAN cell is reselected. However, if the reselection criteria (set in step 60) are satisfied for the UTRAN cell (eg, cells 20-1-B), the process goes to step 66 and the new UTRAN cell is probably reselected.

According to an embodiment of the present invention, the inter-system cell reselection described in the present invention can be applied to the various radio access technologies that are emerging, and is solely related to the current configurations of GERAN and / or UTRAN based systems. It should be understood that it is not.

As noted above, the present invention consists of various modules that provide functionality for performing the steps of the present invention. Modules may be implemented in hardware or as software or firmware to be executed by a computer processor. In particular, in the case of firmware or software, the present invention may be provided as a computer program product comprising a computer readable storage structure embodying computer program code (ie, software or firmware) to be executed by a computer processor.

It should be understood that the above-described arrangements are merely examples of applying the principles of the present invention. Numerous variations and alternative configurations may be devised by those skilled in the art without departing from the scope of the present invention, and the appended claims are intended to cover such modifications and configurations.

Claims (33)

A mobile station selecting a previous cell 20-1-F supported by the second wireless access technology and reading and storing an RSCP conformance threshold from the previous cell; Selecting, by the mobile station, a serving cell supported via a first wireless access technology; And Establishing reselection criteria by the mobile station to reselect a cell supported by the second wireless access technology from the serving cell, The reselection criteria include an offset defined by the mobile station using predetermined criteria for cell reselection from a serving cell to a cell supported via a second wireless access technology by the mobile station in addition to the RSCP conformance threshold. At least one threshold. The method of claim 1, wherein the serving cell is a serving GERAN cell, the cell supported by the second wireless access technology is a UTRAN cell, the previous cell is a previous UTRAN cell, and the first wireless access technology. Is a GSM / EDGE radio access network, the second radio access technology is a universal terrestrial radio access network, and the RSCP compliance threshold is a UTRAN RSCP compliance threshold. The method of claim 2, Determining whether a reselection criterion is satisfied for the UTRAN cell, and if it is satisfied, reselecting the UTRAN cell by a mobile station. The method of claim 2, wherein before selecting the service GERAN cell: Selecting a previous UTRAN cell and reading and storing the UTRAN RSCP conformance threshold from the previous UTRAN cell. 3. The method of claim 2, wherein the offset comprises a hysteresis value or is defined using the power capacity of the mobile station. A computer readable storage medium having stored thereon a computer program comprising computer program code executed by a computer processor, And the computer program code includes instructions that are executed by a computer to cause the steps of claim 2 to be performed. Selecting, by the mobile station, a serving cell supported via the first wireless access technology; And First and second for cell reselection by the mobile station from the serving cell to a cell supported via the second wireless access technology to reselect a cell supported via the second wireless access technology; Setting reselection criteria by the mobile station; The first reselection criterion includes a threshold comprising an offset added to the ratio by the mobile station in addition to the ratio of energy received per PN chip from the common pilot channel to the total received power spectral density at the antenna connector of the mobile station. Wherein the second reselection criterion comprises an RSCP threshold, the offset for the ratio and the RSCP threshold are provided by the serving cell to the mobile station, and if the mobile station does not support the RSCP threshold, the offset is Not added to said ratio. 8. The method of claim 7, wherein the serving cell is a serving GERAN cell, a cell supported via the second radio access technology is a UTRAN cell, the first radio access technology is a GSM / EDGE radio access network, and the second radio And the access technology is a universal terrestrial radio access network, wherein the RSCP threshold is a UTRAN RSCP threshold. The method of claim 8, Determining whether the first and second reselection criteria are satisfied for a UTRAN cell, and if it is satisfied, reselecting the UTRAN cell by the mobile station. 9. The method of claim 8, wherein the UTRAN RSCP threshold includes a hysteresis value or is defined using the power capacity of a mobile station. A computer readable storage medium having stored thereon a computer program product comprising computer program code executed by a computer processor, And the computer program code includes instructions that are executed by a computer to cause the steps of the method of claim 8 to be performed. A receive / transmit / processing module for providing a received threshold signal indicative of an RSCP conformance threshold in response to a threshold signal indicative of an RSCP conformance threshold from a previous cell supported by a second wireless access technology; And In response to the received threshold signal indicating the RSCP conformance threshold, a cell re-establishment for setting a reselection criterion for reselecting a cell supported by the second wireless access technology in a serving cell supported by the first wireless access technology; Contains a selection block, And wherein said reselection criterion comprises at least one threshold having an offset defined using a predetermined criterion by a cell reselection block in addition to said RSCP conformance threshold. 13. The method of claim 12, wherein the serving cell is a serving GERAN cell, a cell supported via the second radio access technology is a UTRAN cell, the previous cell is a previous UTRAN cell, and the first radio access technology is GSM / EDGE radio access network, the second radio access technology is a universal terrestrial radio access network, and the RSCP conformance threshold is a UTRAN RSCP conformance threshold. The mobile station of claim 13, wherein the cell reselection block is configured to determine whether the reselection criterion is satisfied for the UTRAN cell and to reselect the UTRAN cell if the criterion is satisfied. The mobile station of claim 13, wherein the offset comprises a hysteresis value or is defined using the power capacity of the mobile station. 14. The mobile station of claim 13, comprising a memory for storing a UTRAN RSCP conformance threshold. RSCP in response to a signal from a serving cell supported by the first wireless access technology, indicating an RSCP threshold and an offset of the ratio of the total received power spectral density at the mobile station's antenna connector to the energy received per PN chip from the common pilot channel. A reception / transmission / processing module for providing a received signal indicative of a threshold and an offset of the ratio; And In response to the received signal indicating an RSCP threshold and the offset of the ratio, a cell reselection block for setting first and second reselection criteria for reselecting a cell supported by a second wireless access technology from the serving cell; Including, The first reselection criterion includes a threshold comprising an offset added to the ratio in addition to the ratio, and if the mobile station does not support the RSCP threshold, the offset is not added to the ratio and the second And the reselection criteria include an RSCP threshold. 18. The method of claim 17, wherein the serving cell is a serving GERAN cell, the cell supported by the second radio access technology is a UTRAN cell, the first radio access technology is a GSM / EDGE radio access network, and the second radio access The technology is a universal terrestrial radio access network, wherein the RSCP threshold is a UTRAN RSCP threshold, the signal from the serving cell is a GERAN signal, and the received signal is a GERAN received signal. 19. The mobile of claim 18, wherein the cell reselection block is configured to determine whether first and second reselection criteria are satisfied for the UTRAN cell, and reselect the UTRAN cell if the criteria are satisfied. station. 19. The mobile station of claim 18, wherein the UTRAN RSCP threshold includes a hysteresis value or is defined using the power capacity of the mobile station. 19. The mobile station of claim 18, comprising a memory for storing the UTRAN RSCP threshold, the ratio and offset. A previous UTRAN cell supported by a universal terrestrial radio access network and providing a threshold signal indicating a UTRAN RSCP conformance threshold; A service GERAN cell supported by a GSM / EDGE radio access network; UTRAN cell supported by a universal terrestrial radio access network; And A mobile station for setting reselection criteria for reselecting the UTRAN cell from a service GERAN cell in response to the threshold signal indicating a UTRAN RSCP conformance threshold; The reselection criterion comprises at least one threshold having an offset defined by a mobile station using a predetermined criterion in addition to the UTRAN RSCP conformance threshold. 23. The system of claim 22, wherein the mobile station is configured to determine whether the reselection criterion is satisfied for a UTRAN cell, and if so, to reselect the UTRAN cell. UTRAN cell supported by a universal terrestrial radio access network; A service GERAN cell supported by a GSM / EDGE radio access network and providing a GERAN signal; And Reselecting the UTRAN cell in the serving GERAN cell in response to a GERAN signal indicating an UTRAN RSCP threshold and an offset of the ratio of received energy per PN chip from the common pilot channel to the total received power spectral density at the antenna connector of the mobile station. And a mobile station for establishing first and second reselection criteria for the The first reselection criterion includes a threshold having an offset added to the rate by the mobile station in addition to the ratio, and the second reselection criterion comprises a UTRAN RSCP threshold, if the mobile station is configured to the RSCP. The offset is not added to the ratio if the threshold is not supported. delete delete 13. The mobile station of claim 12, wherein the cell reselection block and the receive / transmit / processing module are included in an integrated circuit. In the mobile station, Transmission and reception means for providing a received threshold signal indicating the RSCP compliance threshold in response to a threshold signal indicating an RSCP compliance threshold from a previous cell supported by a second wireless access technology; And Reselection means for setting a reselection criterion for reselecting a cell supported by the second wireless access technology from a service cell supported by the first wireless access technology in response to the received threshold signal indicating the RSCP conformance threshold; Including, The reselection criterion comprises, in addition to the RSCP conformance threshold, at least one threshold comprising an offset defined by the reselection means using a predetermined criterion. 29. The mobile station of claim 28, wherein the reselection means is arranged to determine whether the reselection criteria are satisfied for the UTRAN cell and to reselect the UTRAN cell if it is satisfied. In the mobile station, In response to a signal indicative of an offset of the ratio of total received power spectral density at the antenna connector of the mobile station to energy received per PN chip from an RSCP threshold and a common pilot channel from a serving cell supported by a first wireless access technology, Transmitting and receiving means for providing a received signal indicative of the RSCP threshold and the offset of the ratio; And Reselection means for setting first and second reselection criteria for reselecting a cell supported by a second wireless access technology from the serving cell in response to the received signal indicating the RSCP threshold and the offset of the ratio; and, And said first reselection criterion comprises a threshold comprising an offset added to said ratio in addition to said ratio, and said second reselection criterion comprises said RSCP threshold. 31. The method of claim 30, wherein the reselection means is configured to determine whether the reselection criteria are matched for the cell supported by the second radio access technology and to reselect the cells if they are met. Mobile station. 25. The mobile station of claim 24, wherein the mobile station is configured to determine whether the reselection criterion is met for the cell supported by the second wireless access technology, and if so, reselect the UTRAN cell. system. 18. The mobile station of claim 17, wherein the cell reselection block and the receive / transmit / processing module are included in an integrated circuit.

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