CN104980984B - Method and terminal for reselecting inter-system cell - Google Patents
Method and terminal for reselecting inter-system cell Download PDFInfo
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- CN104980984B CN104980984B CN201410134836.0A CN201410134836A CN104980984B CN 104980984 B CN104980984 B CN 104980984B CN 201410134836 A CN201410134836 A CN 201410134836A CN 104980984 B CN104980984 B CN 104980984B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
Abstract
The invention provides a method for reselecting a cell of a different system implemented by a terminal. The method comprises the following steps: when the terminal resides in a GSM cell, judging whether current system parameters related to the GSM cell and a TD-SCDMA cell can cause the reselection of a different system ping-pong cell; and if the current system parameters of the GSM cell and the TD-SCDMA cell can cause the inter-system ping-pong cell reselection, performing reselection from the GSM cell to the TD-SCDMA cell by using the sum of the current measurement threshold for starting measurement of the GSM cell in the TD-SCDMA cell and the reselection hysteresis value as a reselection threshold for reselecting the TD-SCDMA cell from the GSM cell, and if the current system parameters of the TD-SCDMA cell and the GSM cell can not cause the inter-system ping-pong cell reselection, performing reselection from the GSM cell to the TD-SCDMA cell by using the current reselection threshold for reselecting the TD-SCDMA cell from the GSM cell as a reselection threshold for reselecting the TD-SCDMA cell from the GSM cell.
Description
Technical Field
The present invention relates to a method and a terminal for inter-system cell reselection, and more particularly, to a method and a terminal for inter-system cell reselection, which are particularly suitable for TD-SCDMA (time division synchronous code division multiple access) networks and GSM (global system for mobile communications) networks.
Background
Compared with the mature 2G (second generation) wireless network, especially the GSM network, the 3G (third generation) wireless network, especially the TD-SCDMA network, as an emerging technology, the construction of the infrastructure and the like thereof is inevitably a process which is gradually advanced and continuously improved. In a short time, it is impossible for a 3G network to exist in place of a 2G network. The coverage of the 2G network with large range and high quality can make up the problems of small coverage of the current 3G network and the like, and the 2G network can coexist with the 3G network in a long time in the future.
Due to the small coverage of current 3G networks, terminals served by a 3G network often face the need to be temporarily reselected to a 2G network with good signal quality because no good signal is received in the edge zones of the 3G network. Such cell reselection is typically performed automatically based on certain parameters previously set by the operator on the network side in order to provide the user experience of seamless reselection.
However, the parameter setting related to cell reselection between the current TD-SCDMA network and the GSM network often causes the ping-pong cell reselection problem to occur, that is, in the edge zone of the TD-SCDMA network, the terminal often reselects between the TD-SCDMA network and the GSM network frequently. This can significantly consume power at the terminal and increase the probability of a page failure.
Disclosure of Invention
The present invention is directed to a method and a terminal for inter-system cell reselection, which solves at least one of the above-mentioned disadvantages of the prior art, and more particularly, to a method and a terminal for inter-system cell reselection, which are particularly suitable for TD-SCDMA networks and GSM networks. The method and the terminal can effectively prevent the occurrence of the inter-system ping-pong cell reselection.
According to a first aspect of the present invention, there is provided a method for inter-system cell reselection performed by a terminal. The method comprises the following steps: when the terminal resides in a GSM cell, judging whether current system parameters related to the GSM cell and a TD-SCDMA cell can cause the reselection of a different system ping-pong cell; and if the current system parameters of the GSM cell and the TD-SCDMA cell can cause the inter-system ping-pong cell reselection, performing reselection from the GSM cell to the TD-SCDMA cell by using the sum of the current measurement threshold for starting measurement of the GSM cell in the TD-SCDMA cell and the reselection hysteresis value as a reselection threshold for reselecting the TD-SCDMA cell from the GSM cell, and if the current system parameters of the TD-SCDMA cell and the GSM cell can not cause the inter-system ping-pong cell reselection, performing reselection from the GSM cell to the TD-SCDMA cell by using the current reselection threshold for reselecting the TD-SCDMA cell from the GSM cell as a reselection threshold for reselecting the TD-SCDMA cell from the GSM cell.
In one embodiment, the method further comprises, while the terminal is camped on the TD-SCDMA cell, acquiring current system parameters of the TD-SCDMA cell and storing the current system parameters of the TD-SCDMA cell in the terminal.
In one embodiment, the current system parameters of the TD-SCDMA cell are stored as entries of a list, and the list can be used to store system parameters of at least one TD-SCDMA cell.
In one embodiment, the list is updated periodically or when current system parameters of the TD-SCDMA cell change.
In one embodiment, determining whether current system parameters for the GSM cell and the TD-SCDMA cell result in a inter-system ping pong cell reselection comprises: comparing a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell with a current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell, if the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is greater than the current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell, then current system parameters for the GSM cell and the TD-SCDMA cell do not cause inter-system ping-pong cell reselection; current system parameters for a GSM cell and a TD-SCDMA cell may result in a inter-system ping pong cell reselection if a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is less than or equal to a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell.
In one embodiment, the method further comprises: when the terminal resides in a GSM cell, starting measurement of the TD-SCDMA cell by using a current measurement threshold for starting measurement of the TD-SCDMA cell in the GSM cell; and initiating measurement of the GSM cell using a current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell and performing reselection from the TD-SCDMA cell to the GSM cell using a current reselection threshold for reselection from the TD-SCDMA cell to the GSM cell while the terminal is camped on the TD-SCDMA cell.
In one embodiment, the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells is relative to a signal level value measured downlink from the cell.
In one embodiment, the current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell is the parameter TDD _ Qoffset broadcast via the BCCH channel of a GSM cell; the current measurement threshold for initiating measurements on GSM cells in TD-SCDMA cells is TDDsearchRATgsm = ssearchratmin + (Qrxlevmin + qrxlevminaffset) + Pcompensation, where parameter ssearchratmin, parameter Qrxlevmin, parameter qrxlevminaffset and parameter Pcompensation are all system messages from TD-SCDMA cells, ssearchratmin represents a measurement threshold relative to a cell selection reception level value Srxlev for initiating measurements on GSM cells in TD-SCDMA cells, parameter Qrxlevmin represents a minimum signal requirement for a cell to be selected, parameter qrxlevminaffset represents an offset value RACH relative to Qrxlevmin, and parameter Pcompensation represents a maximum transmit power offset value that cannot be compensated at a cell allowed transmit power when a user equipment is using a (random access channel) access network.
In one embodiment, the reselection hysteresis value is greater than 0 dBm (decibel-milliwatt). Preferably, the reselection hysteresis value is between 2dBm and 4 dBm.
According to another aspect of the present invention, a terminal for performing inter-system cell reselection is provided. Wherein the terminal supports a cell reselection scheme for reselecting a cell by queuing the qualities of a plurality of cells to be selected. The terminal includes: a determining unit, configured to determine whether a current system parameter related to a GSM cell and a TD-SCDMA cell may cause a inter-system ping-pong cell reselection when the terminal resides in the GSM cell; and the execution unit is used for reselecting the TD-SCDMA cell from the GSM cell by taking the sum of the current measurement threshold and reselection hysteresis value for starting measurement of the GSM cell in the TD-SCDMA cell as a reselection threshold for reselecting the TD-SCDMA cell from the GSM cell under the condition that the current system parameters of the GSM cell and the TD-SCDMA cell can cause the reselection of the inter-system ping-pong cell, and reselecting the TD-SCDMA cell from the TD-SCDMA cell by taking the current reselection threshold for reselecting the GSM cell as a threshold for reselecting the TD-SCDMA cell from the GSM cell under the condition that the current system parameters of the GSM cell and the TD-SCDMA cell can not cause the reselection of the inter-system ping-pong cell.
In one embodiment, the terminal further includes: an obtaining unit, configured to obtain a current system parameter of the TD-SCDMA cell when the terminal resides in the TD-SCDMA cell; and the storage unit is used for storing the acquired current system parameters of the TD-SCDMA cell in the terminal.
In one embodiment, the current system parameters of the TD-SCDMA cell are stored as entries of a list, and the list can be used to store system parameters of at least one TD-SCDMA cell.
In one embodiment, the list is updated periodically or when current system parameters of the TD-SCDMA cell change.
In one embodiment, the judging unit includes: a comparing unit for comparing a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell with a current measurement threshold for initiating a measurement of the GSM cell in the TD-SCDMA cell, if the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is greater than the current measurement threshold for initiating a measurement of the GSM cell in the TD-SCDMA cell, then current system parameters for the GSM cell and the TD-SCDMA cell do not cause a inter-system ping-pong cell reselection; current system parameters for a GSM cell and a TD-SCDMA cell may result in a inter-system ping pong cell reselection if a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is less than or equal to a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell.
In one embodiment, the execution unit further comprises: a measuring unit, configured to start measurement of a TD-SCDMA cell by using a current measurement threshold for starting measurement of the TD-SCDMA cell in the GSM cell when the terminal resides in the GSM cell; and a measurement reselection unit, configured to initiate measurement of the GSM cell using a current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell and perform reselection from the TD-SCDMA cell to the GSM cell using a current reselection threshold for reselecting from the TD-SCDMA cell to the GSM cell, when the terminal resides in the TD-SCDMA cell.
In one embodiment, the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells is relative to a signal level value measured downlink from the cell.
In one embodiment, the current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell is the parameter TDD _ Qoffset broadcast via the BCCH channel of a GSM cell; the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells is TDDsearchRATgsm = ssearchratmin + (Qrxlevmin + qrxlevminaffset) + Pcompensation, where parameter ssearchratmin, parameter Qrxlevmin, parameter qrxlevminaffset and parameter Pcompensation are all system messages from TD-SCDMA cells, ssearchratmin represents a measurement threshold relative to a cell selection reception level value Srxlev for initiating measurements of GSM cells in TD-SCDMA cells, parameter Qrxlevmin represents a minimum signal requirement for a cell to be selected, parameter qrxlevminaffset represents a RACH relative to a value of a Qrxlevmin offset, and parameter Pcompensation represents a compensation value for a maximum transmit power allowed by a cell when a user equipment cannot transmit with the cell using an access network.
In one embodiment, the reselection hysteresis value is greater than 0 dBm. Preferably, the reselection hysteresis value is between 2dBm and 4 dBm.
Drawings
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
In the drawings:
fig. 1 shows a flowchart of a method for inter-system cell reselection according to an exemplary embodiment of the present invention.
Fig. 2 illustrates a block diagram of a terminal for inter-system cell reselection according to an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
A method for inter-system cell reselection according to an exemplary embodiment of the present invention will be described in detail with reference to fig. 1. It should be noted that unless otherwise specified, the terminal-supported cell reselection scheme in accordance with the present invention specifically indicates a cell reselection scheme for reselecting a cell by queuing multiple candidate cells with certain metrics (e.g., cell signal strength and signal quality). Specifically, the cell reselection scheme is that when the terminal needs to perform a cell reselection operation, if a plurality of candidate cells all satisfy a predetermined condition, the plurality of candidate cells are queued based on the specific metric (such as signal strength and/or signal quality), and an optimal candidate cell is selected for reselection based on a queuing result.
As shown in fig. 1, a method 100 for inter-system cell reselection according to an exemplary embodiment of the present invention includes: at step 102, determining whether the current system parameters will result in a ping-pong cell reselection; if so, cell reselection is performed using the reset system parameters at step 104; if not, cell reselection is performed using current (legacy) system parameters at step 106. Each step is described in detail below.
At step 102, while the terminal is camped on a GSM cell, the terminal determines whether current system parameters for the GSM cell and the TD-SCDMA cell would result in a inter-system ping-pong cell reselection. The terminal may obtain and/or know the relevant system parameters of the TD-SCDMA cell and the GSM cell that it will be involved in cell reselection, such as a measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell, a reselection threshold for reselecting from the TD-SCDMA cell to the GSM cell, a measurement threshold for initiating measurements of the TD-SCDMA cell in the GSM cell, and a reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell, among others, by various methods.
For example, for various system parameters of the TD-SCDMA cell, the terminal may obtain the current system parameters of the TD-SCDMA cell in advance by receiving signals broadcast or unicast by the TD-SCDMA cell when the terminal resides in the TD-SCDMA cell and store the current system parameters of the TD-SCDMA cell in its own memory. The current system parameters of the TD-SCDMA cell may be stored, for example, in the form of a list. In the list, system parameters of at least one TD-SCDMA cell may be stored, and system parameters of a particular TD-SCDMA cell may be stored as an entry in the list. In each entry, for example, the number of TD-SCDMA cells, the names of various system parameters, values, etc. may be included. These lists may be updated periodically or as the current system parameters of the TD-SCDMA cells change, to reflect the latest situation of each TD-SCDMA cell. In practice, the terminal may retrieve specific parameter values by querying the items in the list when in use. However, it should be understood by those skilled in the art that the system parameters of the TD-SCDMA cell may be stored in any other manner and should be considered to fall within the spirit and scope of the present invention as claimed.
For various system parameters of a GSM cell, the terminal may obtain the current system parameters of the GSM cell by receiving signals broadcast or unicast by the GSM cell and may store them in its own memory, similarly, after reselecting the GSM cell based on the current system parameters of the TD-SCDMA cell for the first time. However, the method for acquiring the current system parameters of the GSM cell and the TD-SCDMA cell is given by way of example only and not by way of limitation, it should be understood that any method known to those skilled in the art may be used for acquiring the current system parameters of the GSM cell and the TD-SCDMA cell, and should be considered to fall within the spirit and scope of the claimed invention.
The inventors have realized that inter-system ping-pong cell reselection is likely to occur when the current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell and the current measurement threshold setting for initiating measurements of the GSM cell in the TD-SCDMA cell satisfy certain conditions. The inventors have appreciated that a current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell being less than or equal to a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell is likely to cause a inter-system ping-pong cell reselection situation to occur. Specifically, in the case where the measure of the quality of service (such as the value of the received signal level) that the TD-SCDMA cell can provide to the terminal is between the current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell and the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell (i.e., is less than or equal to the current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell and is greater than or equal to the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell), the terminal may reselect to the GSM cell because the measure of the quality of service that the TD-SCDMA cell can provide is less than or equal to the current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell. However, since the measure of the quality of service (such as the value of the received signal level) that the TD-SCDMA cell can provide to the terminal at this time is greater than or equal to the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell, the terminal will reselect back from the GSM cell to the TD-SCDMA cell. Thus, a heterogeneous system ping-pong cell reselection situation occurs.
Therefore, at step 102, determining whether the current system parameters of the GSM cell and the TD-SCDMA cell may cause the inter-system ping-pong cell reselection may specifically include: comparing a current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell with a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell; if the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is greater than the current measurement threshold for starting measurement of the GSM cell in the TD-SCDMA cell, the current system parameters of the GSM cell and the TD-SCDMA cell do not cause the inter-system ping-pong cell reselection; current system parameters for a GSM cell and a TD-SCDMA cell may result in a inter-system ping pong cell reselection if a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is less than or equal to a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell.
The above criteria will be described below by taking the current specific system parameters as an example.
In the existing standard 3GPP (3rd Generation Partnership Project) 25.304, provision is made for inter-RAT (also called inter-system) measurement criteria, i.e. if Srxlev is present when a terminal is camped in a TD-SCDMA cell<=SsearchRATm(1) GSM measurements are initiated, wherein Srxlev represents the cell selection reception level value in dB (decibel), SsearchRATmDenotes a measurement threshold for initiating measurements on a GSM cell in a TD-SCDMA cell, m in the present invention represents a GSM cell, that is, SsearchRATmMay also be denoted as SsearchRATgsm. Furthermore, in standard 3GPP 25.304, Srxlev = Q is also specifiedrxlevmeas- (Qrxlevmin + QrxlevminOffset) -Pcompenation (2), wherein QrxlevmeasThe signal level value of the downlink measurement of the current TD-SCDMA cell, namely the RSCP (received signal code power) value received by the P-CCPCH (primary common control physical channel), also called level value, the unit is dBm, which is a dynamic value measured according to the cell environment. The parameter Qrxlevmin represents the minimum signal requirement for the cell to be selected, the parameter qrxlevminaffset represents an offset value from Qrxlevmin, and the parameter Pcompensation represents a power compensation value when the user equipment cannot transmit at the maximum transmission power allowed by the cell when using the RACH to access the network. It should be noted that the parameter SsearchRATmThe parameters Qrxlevmin, QrxlevminOffset and the parameter PcomPension are all system parameters of the TD-SCDMA cell, and can be obtained through system signals broadcasted by the TD-SCDMA cell.
In the above case, after substituting equation (2) into equation (1) and replacing m with gsm, we obtain:
Qrxlevmeas-（Qrxlevmin+QrxlevminOffset）-Pcompensation<=SsearchRATgsm
after that, the above formula is converted again to obtain:
Qrxlevmeas<=SsearchRATgsm+（Qrxlevmin+QrxlevminOffset）+Pcompensation （3）。
from the above conversion, it can be seen that Q is used as a criterion for whether to initiate measurements on GSM cells, using equation (3)rxlevmeasAs a measure and apply SsearchRATgsm(Qrxlevmin + QrxlevminOffset) + PcomPension as a measurement threshold for initiating measurements on GSM cells in TD-SCDMA cells, which is actually equivalent to equation (1) as a criterion whether to initiate measurements on GSM cells, they are completely equivalent in effect. In effect, equation (3) effectively amounts to a unit scaling of the metrics in equation (1), i.e., a conversion from one metric (e.g., a cell selection reception level value) to another metric (e.g., a cell downlink measured signal level value). Thus, the present invention assumes that formula (3) is substituted for formula (1) as a method for residing inAnd judging whether to start the measurement criterion of the GSM cell or not when in the TD-SCDMA cell. Specifically, assume TDDsearchRATgsm = SsearchRATgsm+ (Qrxlevmin + QrxlevminOffset) + PcomPension is the measurement threshold used to initiate measurements on GSM cells in TD-SCDMA cells according to the present invention.
Furthermore, the standard 3GPP 25.304 also specifies that after reselection of a terminal to a GSM cell, reselection is performed with the parameter TDD _ Qoffset (in dBm) as the reselection threshold for reselection from a GSM cell to a TD-SCDMA cell. It should be noted that the parameter Ssearch is similar to the parameter Ssearch described aboveRATgsmSimilarly, the parameter TDD _ Qoffset may also be obtained through system information broadcast by BCCH (broadcast control channel) of GSM cell.
In this case, taking various specific parameters specified in the existing standard as an example, determining whether the current system parameters related to the GSM cell and the TD-SCDMA cell may cause the inter-system ping-pong cell reselection may specifically be converted into comparing the parameter TDD _ Qoffset with the parameter TDDsearchRATgsm. If the TDD _ Qoffset is greater than TDDsearchrATgsm, the current system parameters related to the GSM cell and the TD-SCDMA cell do not cause the reselection of the inter-system ping-pong cell; if TDD _ Qoffset is less than or equal to TDDsearchRATgsm, then current system parameters for GSM cells and TD-SCDMA cells may result in inter-system ping-pong cell reselection.
Returning now to continuing with fig. 1, at step 104, if the current system parameters for the GSM cell and TD-SCDMA cell would result in an inter-system ping pong cell reselection, the sum of the current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell and a reselection hysteresis value (e.g., the customized parameter reset L ECT _ HYSTERESIS) is used as a reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell, and reselection from the GSM cell to the TD-SCDMA cell is performed, for example, according to the above description, the sum of TDDsearchRATgsm and the parameter reset L ECT _ HYSTERESIS is used as a new reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell.
Next, at step 106, if the current system parameters for the GSM cell and the TD-SCDMA cell do not result in a inter-system ping pong cell reselection, a reselection from the GSM cell to the TD-SCDMA cell is made using the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell as the reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell. For example, the system parameter TDD _ Qoffset broadcast by the GSM cell is still used as a reselection parameter for reselecting from the GSM cell to the TD-SCDMA cell.
In one embodiment, the method 100 further includes initiating measurement of the TD-SCDMA cell while the terminal is camped on the GSM cell, using a current measurement threshold for initiating measurement of the TD-SCDMA cell in the GSM cell; and initiating measurement of the GSM cell using a current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell and performing reselection from the TD-SCDMA cell to the GSM cell using a current reselection threshold for reselection from the TD-SCDMA cell to the GSM cell while the terminal is camped on the TD-SCDMA cell. For example, the parameter SsearchRATgsm (or the transformed parameter TDDsearchRATgsm) is still used as the measurement threshold for initiating measurements on GSM cells in TD-SCDMA cells, and the parameter Qsearch _ I is used as the measurement threshold for initiating measurements on TD-SCDMA cells in GSM cells.
Through the parameter setting, the terminal is prevented from frequently reselecting between the TD-SCDMA cell and the GSM cell, so that the electric energy of the terminal is saved, and the paging success probability is increased.
Fig. 2 illustrates a block diagram of a terminal 200 for inter-system cell reselection according to an exemplary embodiment of the present invention. The terminal 200 can, for example, be used to perform the method 100 described above and can bring about the same advantageous effects as the method 100. Therefore, the same parts of the terminal 200 as the above-described method 100 will be omitted to simplify the description of the terminal 200. The terminal may be, for example, a mobile phone or the like.
As shown in fig. 2, the terminal 200 includes a determining unit 201, configured to determine whether current system parameters related to a GSM cell and a TD-SCDMA cell may cause a inter-system ping-pong cell reselection when the terminal resides in the GSM cell;
an executing unit 203, configured to perform reselection from the GSM cell to the TD-SCDMA cell by using a sum of a current measurement threshold and a reselection hysteresis value for starting measurement of the GSM cell in the TD-SCDMA cell as a reselection threshold for reselecting the TD-SCDMA cell from the GSM cell in a case where current system parameters regarding the GSM cell and the TD-SCDMA cell would cause inter-system ping-pong cell reselection, and perform reselection from the GSM cell to the TD-SCDMA cell by using the current reselection threshold for reselecting the TD-SCDMA cell as a reselection threshold for reselecting the TD-SCDMA cell from the GSM cell in a case where the current system parameters regarding the GSM cell and the TD-SCDMA cell would not cause inter-system cell reselection.
In an embodiment, the terminal 200 may further include an obtaining unit 205, configured to obtain current system parameters of the TD-SCDMA cell when the terminal resides in the TD-SCDMA cell; and a storage unit 207, configured to store the acquired current system parameter of the TD-SCDMA cell in the terminal. For example, the current system parameters of the TD-SCDMA cell may be stored as one item of a list, and the list may be used to store the system parameters of at least one TD-SCDMA cell. In one embodiment, the list may be updated periodically or when the current system parameters of the TD-SCDMA cell change, so that the information of the list reflects the latest condition of the TD-SCDMA cell, thereby better avoiding the occurrence of ping-pong cell reselection between different systems.
Additionally, it should be appreciated that the storage unit 207 is not limited to storing system information of TD-SCDMA cells, but may be used to store any other information, such as system parameters of GSM cells, etc.
In one embodiment, the determining unit 201 may further include a comparing unit 209, configured to compare a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell with a current measurement threshold for initiating a measurement of the GSM cell in the TD-SCDMA cell; and if the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is greater than the current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell, determining that the current system parameters for the GSM cell and the TD-SCDMA cell do not result in a inter-system ping-pong cell reselection, and if the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is less than or equal to the current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell, determining that the current system parameters for the GSM cell and the TD-SCDMA cell result in an inter-system ping-pong cell reselection.
In particular, the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells may be a measure relative to a signal level value measured downlink from the cell. The current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell may be a parameter TDD _ Qoffset broadcasted via the BCCH channel of the GSM cell; the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells may be TDDsearchRATgsm = ssearchratmin + (Qrxlevmin + qrxlevminaffset) + Pcompensation, where the parameter ssearchratmin, the parameter Qrxlevmin, the parameter qrxlevminaffset and the parameter Pcompensation are all system messages from TD-SCDMA cells, ssearchratmin represents a measurement threshold relative to a cell selection reception level value Srxlev for initiating measurements of GSM cells in TD-SCDMA cells, the parameter Qrxlevmin represents a minimum signal requirement for a cell to be selected, the parameter qrxlevminaffset represents a RACH relative to Qrxlevmin, and the parameter Pcompensation represents a compensation value for a maximum transmit power allowed for a cell when the user equipment cannot transmit at the maximum transmit power allowed for the cell when using the access network.
In one embodiment, the reselection hysteresis value is greater than 0 dBm. In another embodiment, the reselection hysteresis value is preferably between 2dBm and 4dBm, so as to better prevent the occurrence of a ping-pong cell reselection situation between different systems.
In one embodiment, the performing unit 203 may further include a measuring unit (211) configured to initiate measurement of the TD-SCDMA cell using a current measurement threshold for initiating measurement of the TD-SCDMA cell in the GSM cell when the terminal is camped on the GSM cell; and a measurement reselection unit 213, configured to initiate measurement of the GSM cell using a current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell and perform reselection from the TD-SCDMA cell to the GSM cell using a current reselection threshold for reselection from the TD-SCDMA cell to the GSM cell when the terminal is camped on the TD-SCDMA cell.
It should be understood by those skilled in the art that the judging unit 201, the comparing unit 209, the executing unit 203, the measuring unit 211, the measurement reselecting unit 213, and the obtaining unit 205 shown in fig. 2 are merely various functional units divided in a logical sense. These elements may be implemented in practice using any suitable software, hardware, firmware, etc., and may be combined in any suitable manner. Thus, embodiments in accordance with the invention are not limited to the structural and functional units illustrated in FIG. 2 in general. For example, the various units described above may be executed on one processor or on multiple processors.
Further, the storage unit 207 may practically be any means capable of storing information, such as a volatile or non-volatile storage device.
It will also be appreciated that the invention also extends to computer programs, particularly computer programs on or in a carrier, adapted for putting the invention into practice. The program may be in the form of source code, object code, a code intermediate source and object code such as partially compiled form, or in any other form suitable for use in the implementation of the method according to the invention. It will also be appreciated that such a program may have many different structural designs. For example, program code implementing the functionality of the method or system according to the invention may be subdivided into one or more subroutines. Many different ways of distributing the functionality between these subroutines will be apparent to those skilled in the art. The sub-programs may be stored together in one executable file to form a stand-alone program. This executable file may include computer-executable instructions, such as processor instructions and/or interpreter instructions (e.g., Java interpreter instructions). Alternatively, one or more or all of the subroutines may be stored in at least one external library file and associated with the main program, for example, statically or dynamically at runtime. The main program contains at least one call to at least one subroutine. Likewise, the subroutines may include function calls to each other. Embodiments related to a computer program product comprise computer executable instructions corresponding to each of the processing steps of at least one of the mentioned methods. These instructions may be subdivided into subroutines, and/or stored in one or more files that may be associated statically or dynamically. Another embodiment relating to a computer program product comprises computer-executable instructions corresponding to each of the means of at least one of the mentioned systems and/or products. These instructions may be subdivided into subroutines, and/or stored in one or more files that may be associated statically or dynamically.
The carrier of the computer program may be any entity or device capable of carrying the program. For example, the carrier may comprise a storage medium, such as a ROM (e.g. a CD ROM or a semiconductor ROM) or a magnetic recording medium (e.g. a floppy disk or a hard disk). Further, the carrier may be a transmissible carrier such as an electrical or optical signal, which may be conveyed via electrical or optical cable or by radio or other means. When the program is embodied in such a signal, the carrier may be constituted by such cable or other device or means. Alternatively, the carrier may be an integrated circuit in which the program is embedded, the integrated circuit being adapted for performing, or for use in the performance of, the relevant method.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims (18)
1. A method for inter-system cell reselection implemented by a terminal, the method comprising:
when the terminal resides in a GSM cell, judging whether current system parameters related to the GSM cell and a TD-SCDMA cell can cause the inter-system ping-pong cell reselection (102); and
if the current system parameters for the GSM cell and the TD-SCDMA cell would result in a inter-system ping-pong cell reselection, performing reselection from the GSM cell to the TD-SCDMA cell using a sum of a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell and a reselection hysteresis value as a reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell (104),
if the current system parameters for the GSM cell and the TD-SCDMA cell do not result in a inter-system ping-pong cell reselection, performing reselection from the GSM cell to the TD-SCDMA cell using the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell as the reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell (106),
wherein, judging whether the current system parameters of the GSM cell and the TD-SCDMA cell can cause the inter-system ping-pong cell reselection comprises:
comparing a current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell with a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell;
if the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is greater than the current measurement threshold for starting measurement of the GSM cell in the TD-SCDMA cell, the current system parameters of the GSM cell and the TD-SCDMA cell do not cause the inter-system ping-pong cell reselection;
current system parameters for a GSM cell and a TD-SCDMA cell may result in a inter-system ping pong cell reselection if a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is less than or equal to a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell.
2. The method of claim 1 further comprising, while the terminal is camped on the TD-SCDMA cell, obtaining current system parameters of the TD-SCDMA cell and storing the current system parameters of the TD-SCDMA cell in the terminal.
3. The method of claim 2, wherein the current system parameters of the TD-SCDMA cell are stored as an entry of a list, and the list is usable to store system parameters of at least one TD-SCDMA cell.
4. The method of claim 3 in which the list is updated periodically or when current system parameters of the TD-SCDMA cell change.
5. The method of claim 1, further comprising:
when the terminal resides in a GSM cell, starting measurement of the TD-SCDMA cell by using a current measurement threshold for starting measurement of the TD-SCDMA cell in the GSM cell; and
when the terminal is camped on a TD-SCDMA cell, initiating measurement of the GSM cell using a current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell, and reselecting from the TD-SCDMA cell to the GSM cell using a current reselection threshold for reselecting from the TD-SCDMA cell to the GSM cell.
6. The method of claim 1 in which the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells is relative to a cell downlink measured signal level value.
7. The method of claim 1, wherein the current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell is a parameter TDD Qoffset broadcast via a BCCH channel of a GSM cell; the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells is TDDsearchRATgsm = ssearchratmin + (Qrxlevmin + qrxlevminaffset) + Pcompensation, where parameter ssearchratmin, parameter Qrxlevmin, parameter qrxlevminaffset and parameter Pcompensation are all system messages from TD-SCDMA cells, ssearchratmin represents a measurement threshold relative to a cell selection reception level value Srxlev for initiating measurements of GSM cells in TD-SCDMA cells, parameter Qrxlevmin represents a minimum signal requirement for a cell to be selected, parameter qrxlevminaffset represents a RACH relative to a value of a Qrxlevmin offset, and parameter Pcompensation represents a compensation value for a maximum transmit power allowed by a cell when a user equipment cannot transmit with the cell using an access network.
8. The method of claim 1, wherein the reselection hysteresis value is greater than 0 dBm.
9. The method of claim 8, wherein the reselection hysteresis value is between 2dBm and 4 dBm.
10. A terminal for implementing inter-system cell reselection, the terminal comprising:
a determining unit (201) configured to determine whether a current system parameter related to a GSM cell and a TD-SCDMA cell may cause a inter-system ping pong cell reselection when the terminal resides in the GSM cell;
an execution unit (203) for performing reselection from a GSM cell to a TD-SCDMA cell using a sum of a current measurement threshold for initiating a measurement of the GSM cell in the TD-SCDMA cell and a reselection hysteresis value as a reselection threshold for reselection from the GSM cell to the TD-SCDMA cell, in case current system parameters regarding the GSM cell and the TD-SCDMA cell would cause a inter-system ping-pong cell reselection,
performing reselection from the GSM cell to the TD-SCDMA cell using a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell as a reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell in a case where current system parameters for the GSM cell and the TD-SCDMA cell do not cause inter-system ping-pong cell reselection,
wherein the judging unit (201) comprises:
a comparing unit (209) for comparing a current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell with a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell;
if the current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is greater than the current measurement threshold for starting measurement of the GSM cell in the TD-SCDMA cell, the current system parameters of the GSM cell and the TD-SCDMA cell do not cause the inter-system ping-pong cell reselection;
current system parameters for a GSM cell and a TD-SCDMA cell may result in a inter-system ping pong cell reselection if a current reselection threshold for reselecting from the GSM cell to the TD-SCDMA cell is less than or equal to a current measurement threshold for initiating measurements of the GSM cell in the TD-SCDMA cell.
11. The terminal of claim 10, further comprising:
an obtaining unit (205), configured to obtain a current system parameter of the TD-SCDMA cell when the terminal resides in the TD-SCDMA cell; and
a storage unit (207) configured to store the acquired current system parameter of the TD-SCDMA cell in the terminal.
12. The terminal of claim 11, wherein the current system parameters of the TD-SCDMA cell are stored as an entry of a list, and the list is usable to store system parameters of at least one TD-SCDMA cell.
13. The terminal of claim 12, wherein the list is updated periodically or when current system parameters of the TD-SCDMA cell change.
14. The terminal according to claim 10, the execution unit (203) further comprising:
a measuring unit (211) configured to start measurement of a TD-SCDMA cell using a current measurement threshold for starting measurement of the TD-SCDMA cell in the GSM cell when the terminal resides in the GSM cell; and
a measurement reselection unit (213) configured to initiate measurement of the GSM cell using a current measurement threshold for initiating measurement of the GSM cell in the TD-SCDMA cell and perform reselection from the TD-SCDMA cell to the GSM cell using a current reselection threshold for reselection from the TD-SCDMA cell to the GSM cell when the terminal is camped on the TD-SCDMA cell.
15. The terminal of claim 10, wherein the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells is relative to a cell measured signal level value.
16. The terminal of claim 10, wherein the current reselection threshold for reselecting from a GSM cell to a TD-SCDMA cell is a parameter TDD Qoffset broadcast via a BCCH channel of a GSM cell; the current measurement threshold for initiating measurements of GSM cells in TD-SCDMA cells is TDDsearchRATgsm = ssearchratmin + (Qrxlevmin + qrxlevminaffset) + Pcompensation, where parameter ssearchratmin, parameter Qrxlevmin, parameter qrxlevminaffset and parameter Pcompensation are all system messages from TD-SCDMA cells, ssearchratmin represents a measurement threshold relative to a cell selection reception level value Srxlev for initiating measurements of GSM cells in TD-SCDMA cells, parameter Qrxlevmin represents a minimum signal requirement for a cell to be selected, parameter qrxlevminaffset represents a RACH relative to a value of a Qrxlevmin offset, and parameter Pcompensation represents a compensation value for a maximum transmit power allowed by a cell when a user equipment cannot transmit with the cell using an access network.
17. The terminal of claim 10, wherein the reselection hysteresis value is greater than 0 dBm.
18. The terminal of claim 17, wherein the reselection hysteresis value is between 2dBm and 4 dBm.
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| CN101227705A (en) * | 2007-01-17 | 2008-07-23 | 华为技术有限公司 | System and method for switching terminal to macro cell and terminal, access node and gateway thereof |
| CN101854690A (en) * | 2009-03-31 | 2010-10-06 | 北京三星通信技术研究有限公司 | Cell reselection method and dual-mode terminal thereof |
| CN102264108A (en) * | 2010-05-25 | 2011-11-30 | 电信科学技术研究院 | Method and equipment for adjusting mobility parameters |
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| GB0713391D0 (en) * | 2007-07-11 | 2007-08-22 | Vodafone Plc | Measurement and reselection in idle mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101227705A (en) * | 2007-01-17 | 2008-07-23 | 华为技术有限公司 | System and method for switching terminal to macro cell and terminal, access node and gateway thereof |
| CN101854690A (en) * | 2009-03-31 | 2010-10-06 | 北京三星通信技术研究有限公司 | Cell reselection method and dual-mode terminal thereof |
| CN102264108A (en) * | 2010-05-25 | 2011-11-30 | 电信科学技术研究院 | Method and equipment for adjusting mobility parameters |
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