CN105191410A - Soft handoff method and related device - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00835—Determination of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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Abstract
Provided are a soft handoff method and device. The method comprises: determining same-frequency cells around a cell which is currently connected to a user equipment (UE) as a same-frequency neighbour cell set; receiving a same-frequency event report which is reported by the UE after the same-frequency neighbour cell set is detected, the same-frequency event report comprising a target primary scrambling code (PSC) and an observation time difference of an air interface between the cell which is currently connected and each of the same-frequency cells in the same-frequency neighbour cell set; taking the same-frequency cells, the PSCs of which are the same as the target PSC, as cells to be determined; when the cells to be determined are multiple cells, respectively calculating the differences between the observation time differences and a theoretical time difference; and when the difference satisfies a preset threshold value, determining that a corresponding cell to be determined is a target cell. It can be seen that, when the cells to be determined are multiple cells, a target cell which can be used for a soft handoff can be effectively determined therefrom according to the difference, thereby reducing the failure rate of the soft handoff and eliminating same-frequency interferences.
Description
A kind of soft handover method and relevant apparatus
Technical field
The present invention relates to communication technical field, more particularly, to a kind of soft handover method and relevant apparatus.Background technology
In a wireless communication system, with user equipment（User Equipment, UE movement), UE peripheries wireless signal can be caused to produce the interference signal of dynamic change, in order to ensure UE communication quality, the suitable cell of signal must be determined according to shift position current UE, and the wireless connection between the UE and former cell is switched into the wireless connection of the cell stronger with current demand signal, here it is the concept switched in cell mobile communication systems.Soft handover is one kind in a variety of switching types, it be characterized in UE on the premise of already present wireless connection is not turned off, with another cell（Even with same cell）Another wireless connection is set up, while being communicated using two wireless connections, UE is not turned off and wireless access network all the time in this process（Radio Access Network, RAN) connection, soft handover compared to the advantage of other switching types be during UE is moved from a cell to another cell business can smooth excessiveness, ongoing communication quality is unaffected.
Soft handover is carried out in the prior art, is usually by radio network controller（RNC, Radio Network Controller), that is, receive and the main scrambler of the target for meeting soft handover signal conditioning reported after the information of peripheral cell is detected by UE（Primary synchronization code, PSC), RNC determines Target cell according to PSC from the peripheral cell of the UE, and the UE is carried out into soft handover to the Target cell.
But the target PSC reported in many cases according to UE can determine whether out multiple cells to be determined with PSC identical with the target PSC, but an effective method can not complete the Target cell of operating in soft handover accurately to be determined from multiple cells to be determined at present, often occur determining or the wrong situation for determining Target cell so that the mortality of soft handover is higher.The content of the invention
Present invention solves the technical problem that being to provide kind of a kind of a soft handover method and relevant apparatus.
In order to solve the above technical problems, the present invention is adopted the technical scheme that：
In a first aspect, a kind of surrounding co-frequency cell for a cell for currently connecting user equipment (UE) the invention provides soft handover method, radio network controller (RNC) is defined as homogeneous-frequency adjacent-domain set, methods described includes：
The RNC receives the UE and detects the same frequency event report reported after the homogeneous-frequency adjacent-domain set, and the same frequency event report includes the observed time difference eated dishes without rice or wine in the main scrambler PSC of target and the cell currently connected and homogeneous-frequency adjacent-domain set between each co-frequency cell；
The PSC of each co-frequency cell is matched during the RNC gathers the target PSC of acquisition with the homogeneous-frequency adjacent-domain, regard the PSC and co-frequency cell described in the target PSC identicals as cell to be determined；
When the cell to be determined is multiple cells with different districts ID, the RNC calculates the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference and the cell currently connected and the corresponding cell to be determined of the correspondence cell to be determined respectively；
When the difference meets predetermined threshold value, the RNC determines that the cell to be determined of the correspondence difference carries out the Target cell of soft handover for the UE.
In the first possible implementation of first aspect, the RNC calculates the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference and the cell currently connected and the corresponding cell to be determined of the correspondence cell to be determined respectively, including：
X=ABS(((OFFa+Tma)-(OFFb+Tmb))mod 256 - ((Diffa-Tcella)-(Diffb-Tcellb)) mod 256)
Wherein,
A represents the cell currently connected；B represents any one in the cell to be determined；
OFFa and Tma numerical value is obtained from the RNC from the FrameOffset and ChipOffset of the UE of preservation Radio Link links；
Obtained during the cell currently connected and the homogeneous-frequency adjacent-domain that OFFb and Tmb numerical value is included in being accused from the measurement on the UE are gathered in eating dishes without rice or wine between each co-frequency cell and the signal transmission time difference of standard interface IUB interfaces；
The general frame number counter BFN of NodeB and RNC that the acquisition from NodeB grades of load broadcast of Diffa and Diffb numerical value, wherein Diffa and Diffb represent CELLa and CELLb cells respectively lead to
With frame number counter RFN differences；
Tcella and Tcellb is loaded from cell-level and obtained；
ABS represents absolute value.
In second of possible implementation of first aspect, when there is multiple differences to meet predetermined threshold value, the RNC determines that the corresponding cell to be determined minimum in the multiple difference carries out the Target cell of soft handover for the UE.
In the third possible implementation of first aspect, the cell that the UE is currently connected is specially the best cell of the signal qualitys that currently connect of the UE.
With reference to the first or second or the third possible implementation of first aspect or first aspect, in the 4th kind of possible implementation,
Homogeneous-frequency adjacent-domain set includes the set of cells with different districts ID in the homogeneous-frequency adjacent-domain of a cell and the homogeneous-frequency adjacent-domain of the homogeneous-frequency adjacent-domain that the UE currently connects.
Second aspect, the invention provides a kind of soft-switching device, described device includes：
Setting unit, the surrounding co-frequency cell of a cell for user equipment (UE) currently to be connected is defined as homogeneous-frequency adjacent-domain set；
Receiving unit, the same frequency event report reported after the homogeneous-frequency adjacent-domain set is detected for receiving the UE, the same frequency event report includes the observed time difference eated dishes without rice or wine in the main scrambler PSC of target and the cell currently connected and homogeneous-frequency adjacent-domain set between each co-frequency cell；
Matching unit, for the target PSC of acquisition to be matched with the PSC of each co-frequency cell in the set of the homogeneous-frequency adjacent-domain, regard the PSC and co-frequency cell described in the target PSC identicals as cell to be determined；
Difference computational unit, for when it is multiple cells with different districts ID that the matching result of the matching unit, which is the cell to be determined, the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference and the cell currently connected and the corresponding cell to be determined of the correspondence cell to be determined to be calculated respectively；
Determining unit, for when the difference is when meeting predetermined threshold value, it is determined that the cell to be determined of the correspondence difference carries out the Target cell of soft handover for the UE.
In the first possible implementation of second aspect, the difference computational unit is also used for down
State formula and calculate the difference：
X=ABS(((OFFa+Tma)-(OFFb+Tmb))mod 256 - ((Diffa-Tcella)-(Diffb-Tcellb)) mod 256)
Wherein,
A represents the cell currently connected；B represents any one in the cell to be determined；
OFFa and Tma numerical value is obtained from the RNC from the FrameOffset and ChipOffset of the UE of preservation Radio Link links；
Obtained during the cell currently connected and the homogeneous-frequency adjacent-domain that OFFb and Tmb numerical value is included in being accused from the measurement on the UE are gathered in eating dishes without rice or wine between each co-frequency cell and the signal transmission time difference of standard interface IUB interfaces；
The acquisition from NodeB grades of load broadcast of Diffa and Diffb numerical value, wherein Diffa and Diffb represent the general frame number counter BFN of NodeB and the general frame number counter RFN differences of RNC of CELLa and CELLb cells respectively；
Tcella and Tcellb is loaded from cell-level and obtained；
ABS represents absolute value.
In second of possible implementation of second aspect,
The determining unit, is additionally operable to when there is multiple differences to meet predetermined threshold value, determines that the corresponding cell to be determined minimum in the multiple difference carries out the Target cell of soft handover for the UE.
In the third possible implementation of second aspect,
The cell that the UE is currently connected is specially the best cell of the signal qualitys that currently connect of the UE.
With reference to the first or second or the third possible implementation of second aspect or second aspect, in the 4th kind of possible implementation,
Homogeneous-frequency adjacent-domain set includes the set of cells with different districts ID in the homogeneous-frequency adjacent-domain of a cell and the homogeneous-frequency adjacent-domain of the homogeneous-frequency adjacent-domain that the UE currently connects.
It can be seen from above-mentioned technical proposal UE upload reported with frequency event include a cell that the UE currently connects and the homogeneous-frequency adjacent-domain gather in the observation eated dishes without rice or wine between each co-frequency cell when
Between it is poor, so when determining multiple cells to be determined with identical PSC during carrying out operating in soft handover, calculate the difference between the observed time difference and known theoretical time difference of the correspondence cell to be determined, if this difference is less than predetermined threshold value, it can then determine that the corresponding cell to be determined of the difference carries out the Target cell of soft handover for the UE, RNC is according to the observed time difference eated dishes without rice or wine between each co-frequency cell in the UE UE reported the cell currently connected and homogeneous-frequency adjacent-domain set, and the difference between the theoretical time difference eated dishes without rice or wine in the cell currently connected preserved and homogeneous-frequency adjacent-domain set between each co-frequency cell, when cell to be determined is multiple, it effectively can therefrom determine the Target cell available for soft handover, improve the accuracy rate for determining Target cell, reduce the mortality of soft handover and eliminate co-channel interference.
Brief description of the drawings
Fig. 1 is a kind of method flow diagram of soft handover method of the invention；
Fig. 2 is progress soft handover practical operation schematic diagram；
Fig. 3 is a kind of structure drawing of device of soft-switching device of the invention.Embodiment
The embodiments of the invention provide a kind of soft handover method and relevant apparatus, it can be related to cellular concept in the operating process for carrying out soft handover, cell is classified according to the power of the annexation between cell and UE and signal, in general can be divided into three classes：Active set, monitoring collection and detection collection.In soft switching process, UE can set up connection with one or more cells and set up service chaining, active set in other words（Also activation is made to collect）For the current set that all cells being connected are set up with the UE.The UE is during movement, it is certain to change therewith with the signal strength of the cell in original active set, cell and the signal quality of the UE in some of which active set will may be no longer appropriate for keeping being connected to the UE worse and worse, therefore monitoring collection（Also it is Candidate Set）In cell be originally belong to active set but it is current disconnected with the UE and cell that the UE can also be measured set.And detect that the collection UE can currently be detected, but the set for the cell do not set up with the UE in the Neighboring Cell List of the best cell of being not belonging in other words of the being connected signal that the UE currently connects.
Above three set can be converted mutually, and the rational network planning and software realization can make three collection
Close cooperation, cell in active set is removed when being unsatisfactory for signal conditioning from active set, and monitor that the cell that collection and detection are concentrated can be connected when meeting signal conditioning with UE foundation, thus add active set, UE and residing wireless environment is obtained the optimum gain on signal.When UE is in the overlay area of some cell, and the signal of the cell is when meeting condition, because of WCDMA（Wide band Code Division Multiple Access, WCDMA) neighbor cell can be planned to co-frequency cell in system, the co-frequency cell can be added active set by network side, realize the merging or frame selection of multiple wireless signal, to bring up and downstream signal gain, but on the contrary, when the cell for meeting signal conditioning can not add active set, it will result in co-channel interference, therefore in order to obtain signal gain and avoid co-channel interference, network side needs accurately to identify which co-frequency cell can add active set, the connection with UE can be set up in other words.In the prior art generally by the scrambling code information for the Target cell that UE detects cell information and reports the detection for meeting signal conditioning to concentrate, system determines Target cell according to scrambling code information, and soft handover is carried out to the Target cell, the Target cell is added into active set.
RNC is a key network element of emerging 3G network.It is the part of access network, for providing mobile management, call treatment, url management and handover mechanism.Due to RNC is reported according to UE in the prior art target PSC can determine whether out to correspond in other words it is multiple there is PSC identical with the target PSC cell to be determined when, an effective method can not complete the Target cell of operating in soft handover accurately to be determined from multiple cells to be determined, often occur determining or the wrong situation for determining Target cell so that the mortality of soft handover is higher.Therefore in the inventive solutions, RNC is according to the observed time difference eated dishes without rice or wine between each co-frequency cell in the UE UE reported the cell currently connected and homogeneous-frequency adjacent-domain set, and the difference between the theoretical time difference eated dishes without rice or wine in the cell currently connected preserved and homogeneous-frequency adjacent-domain set between each co-frequency cell, when cell to be determined is multiple, it effectively can therefrom determine the Target cell available for soft handover, improve the accuracy rate for determining Target cell, reduce the mortality of soft handover and eliminate co-channel interference.
At present it is determined that the optional set of cells that UE carries out soft handover is mainly the homogeneous-frequency adjacent-domain that the current homogeneous-frequency adjacent-domain that the cell being connected is set up with the UE is namely cell in active set, selectable scope is less, the probability of the situation appearance for adding Target cell of the selection less than progress soft handover that so can be covert, therefore for this technical problem, technical scheme additionally provides a kind of preferred optional set of cells：Homogeneous-frequency adjacent-domain is gathered, and is further defined as UE active set and is monitored collection
There is different districts ID set of cells in homogeneous-frequency adjacent-domain, because the cell that monitoring is concentrated is also a part for the homogeneous-frequency adjacent-domain for the cell that the UE sets up connection in fact, therefore the homogeneous-frequency adjacent-domain of monitoring collection can be also very big as the possibility of the UE Target cells for carrying out soft handover, thus rationally effective expansion has been carried out on the selection range of Target cell, the mortality of soft handover is reduce further.
In order that those skilled in the art more fully understand the scheme of the embodiment of the present invention, the embodiment of the present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
Embodiment one
Fig. 1 is referred to, it is a kind of method flow diagram of soft handover method of the invention, be the described method comprises the following steps：
S100:The surrounding co-frequency cell for the cell that radio network controller (RNC) currently connects user equipment (UE) is defined as homogeneous-frequency adjacent-domain set.
Explanation is needed exist for, this step belongs to setting steps, after setting, unless needed for definition is gathered to homogeneous-frequency adjacent-domain or scope is modified, otherwise need not perform during operating in soft handover is carried out and again this step.
The cell that UE described here is currently connected can refer to have built up any one in the one or more cells being connected with the UE, in order to determine relative signal quality preferably cell to be determined, technical scheme gives one preferred embodiment, it is specially to choose the best cell of signal quality that the UE currently connects to choose the cell that the UE currently connects, using the best cell of this signal quality as reference, the scope of homogeneous-frequency adjacent-domain set is determined.
At present it is determined that the optional set of cells that UE carries out soft handover is mainly the homogeneous-frequency adjacent-domain that the current homogeneous-frequency adjacent-domain that the cell being connected is set up with the UE is namely cell in active set, selectable scope is less, the probability of the situation appearance for adding Target cell of the selection less than progress soft handover that so can be covert.And the homogeneous-frequency adjacent-domain set of this step, refer to the set of cells with the co-frequency cell around the cell being connected with the UE chosen, such as the cell nearer apart from the cell, in order to determine relative signal quality preferably cell to be determined, technical scheme gives one preferred embodiment, will the surrounding co-frequency cell be further defined as choose the different districts ID set of cells.Moreover, when the best cell of signal quality in the cell that the cell that the UE of selection is currently connected specially currently is connected with the UE, the surrounding is with frequency
The set of cell with different districts ID in cell and active set that cell is concentrated equivalent to the active set including the UE, monitoring and the homogeneous-frequency adjacent-domain that monitoring collects, because the cell that monitoring is concentrated is also a part for the homogeneous-frequency adjacent-domain that be connected cell is set up with the UE in fact, therefore the homogeneous-frequency adjacent-domain of monitoring collection can be also very big as the possibility of the UE Target cells for carrying out soft handover, thus rationally effective expansion has been carried out on the selection range of Target cell, the mortality of soft handover is reduce further.
S101：The RNC receives the UE and detects the same frequency event report reported after the homogeneous-frequency adjacent-domain set, and the same frequency event report includes the observed time difference eated dishes without rice or wine in the main scrambler PSC of target and the cell currently connected and homogeneous-frequency adjacent-domain set between each co-frequency cell；
Need exist for explanation be, the UE is according to set by step S100, detect each cell included in the homogeneous-frequency adjacent-domain set, the PSC of soft handover can be carried out by determining, and according to the data transfer during detection, the observed time difference eated dishes without rice or wine between each co-frequency cell and the selected cell currently connected with the UE in the homogeneous-frequency adjacent-domain set is determined, in case using in step s 103.
S102:The PSC of each co-frequency cell is matched during the RNC gathers the target PSC of acquisition with the homogeneous-frequency adjacent-domain, regard the PSC and co-frequency cell described in the target PSC identicals as cell to be determined；
Need exist for explanation be, the RNC has just saved the PSC of each cell in networking, therefore the PSC of each co-frequency cell is that the RNC chooses from the PSC preserved in homogeneous-frequency adjacent-domain set here, belongs to prior art, just repeats no more here.
During being matched, all cells during can disposably the homogeneous-frequency adjacent-domain be gathered are matched, small during can also the homogeneous-frequency adjacent-domain be gathered is divided into several parts and matched successively, and the foundation of division is the distance with homogeneous-frequency adjacent-domain apart from the selected cell currently connected.This matching way can fast and accurately determine cell to be determined.
Matched in the homogeneous-frequency adjacent-domain of the cell currently connected in first gathering the homogeneous-frequency adjacent-domain, if matched with target PSC identical cells, matched and do not continued to be matched behind this cell portion, into step S103.
If match it is unsuccessful if further gather from the homogeneous-frequency adjacent-domain in active set other cells homogeneous-frequency adjacent-domain in matched, if matched with target PSC identical cells, then match and do not continued to be matched behind this cell portion, into step S103.
Further remove and matched after above-mentioned two parts cell in remaining cell from the set of the homogeneous-frequency adjacent-domain if matching is unsuccessful, if matched with target PSC identical cells, then match behind this cell portion, into step S103.
S103:When the cell to be determined is multiple cells with different districts ID, the RNC calculates the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference of the correspondence cell to be determined and the cell currently connected and the corresponding cell to be determined of preservation respectively；
Need exist for explanation, the theoretical time difference be by networking when the configuration data of each cell obtain and preserve, the RNC is when calculate the difference, and the theoretical time difference is that the RNC is directly obtained from the data of preservation.When being calculated, in addition to other calculations that can calculate the difference, technical scheme provides a kind of calculation of the preferred calculating difference：
X=ABS(((OFFa+Tma)-(OFFb+Tmb))mod 256 - ((Diffa-Tcella)-(Diffb-Tcellb)) mod 256);
Wherein,
A represents the cell currently connected；B represents any one in the cell to be determined.OFFa and Tma numerical value is obtained from the RNC from the FrameOffset and ChipOffset of the UE of preservation Radio Link links.
Obtained during the cell currently connected and the homogeneous-frequency adjacent-domain that OFFb and Tmb numerical value is included in being accused from the measurement on the UE are gathered in eating dishes without rice or wine between each co-frequency cell and the signal transmission time difference of standard interface IUB interfaces.
That is the data in (OFFa+Tma)-(OFFb+Tmb) are to belong to the data related to eating dishes without rice or wine.
Diffa and Diffb numerical value is obtained from NODEB grades of load broadcast, wherein Diffa and Diffb represent BFN and the RFN difference of CELLa and CELLb cells respectively, wherein BFN is the general frame number counter in NodeB, full name is Node B Frame Number, and number range arrives for 0
4095frameso RFN are RNC general frame number counter, and full name is RNC Frame Number, and number range is 0 to 4095fmmes.
Tcella and Tcellb is loaded from cell-level and obtained, wherein Tcell is Supplemental Channel (Supplemental Channel in cell, SCH), CPICH Common Pilot Channel (Common Pilot Channel,) and a time offset of the downlink scrambling code relative to BFN CPICH, span 0 to 9, unit is 256chips.
That is the data in (Diffa-Tcella)-(Diffb-Tcellb) are to belong to and the interface related data of standard interface IUB.
ABS represents absolute value.
S104:When the difference is when meeting predetermined threshold value, the RNC determines that the cell to be determined of the correspondence difference carries out the Target cell of soft handover for the UE.
That is, when the UE detect the presently described observed time difference determined and the theoretical time difference that has preserved closer to, that is the X obtained numerical value is smaller, then it represents that the more suitable Target cell that soft handover is carried out as the UE of the corresponding cell of the observed time difference.
The predetermined threshold value can be according to residing for current UE network area network environment carry out adaptability increase or reduction, so that the final situation that can not determine Target cell occurs in reduction of trying one's best, and reduction determines that the corresponding X of multiple cells to be determined numerical value can meet the situation appearance of predetermined threshold value as far as possible.
For the effective N spatial datas safeguarded switching flow, define a respective cell：When some cell is as BestCell, an associated N spatial data structure is described as follows：There is data structure identical N bars record（Record number can be added arbitrarily）, every record includes：The corresponding CELLID numbers of one PSC, the PSC（0,1 or multiple）, cell to be determined, the continuous handoff failure number of times of cell to be determined, and a flag bit for whether needing regularly to remove for this record；
According to step S103, calculate respectively each cell in the corresponding cell to be determined of the cell Xi (i=l, 2 ... m), the Xi cells for being less than or equal to the predetermined threshold value are added into set Y;
If set Υ numbers are equal to 0, " number of cells to be determined is identified " of the PSC is designated as " equal to 0 " and exits algorithm；
If set Y numbers are more than 1, only record " number of cells mark to be determined " is " being more than 1 ", and the minimum corresponding cell ID to be determined of selection wherein Xi values carries out soft handover；
If set Y numbers are equal to 1, corresponding CELLID is included in N spaces, selects the cell ID to be determined to carry out soft handover；
After initiation soft handover, RNC is easy to the efficient process of subsequent detection collection report further according to whether RL_Restore_Ind confirmations handover success or failure is received, and safeguard in N spaces data such as " the continuous handoff failure number of times of candidate cell ".
That is, when there is multiple differences to meet predetermined threshold value, the RNC determines that the corresponding cell to be determined minimum in the multiple difference carries out the Target cell of soft handover for the UE.State.Fig. 2 is referred to, it carries out soft handover practical operation schematic diagram for the present invention.In the present embodiment, the UE cell currently connected is further defined to the best cell of signal quality that the UE currently connects, and the surrounding co-frequency cell of the best cell of the signal quality that the UE is currently connected is further defined to the set of cells in the best homogeneous-frequency adjacent-domain of cell of signal quality that the UE currently connects and the homogeneous-frequency adjacent-domain of the homogeneous-frequency adjacent-domain with different districts ID.
C1 is the current connected optimum subdistricts of the UE（The best cell of the signal quality that namely currently connects）
Cll, C12, C13, C14, C15 are C1 homogeneous-frequency adjacent-domains.
Wherein, C11 and C12 belong to the active set cell of the UE, i.e., also establish and be connected with the UE.
C13, C14 and C15 belong to the monitoring collection cell of the UE.
Clll, C112, C113, C121, C122, C131, C132, C141, C142, C151, C152, C153 and C888 belong to the detection collection cell of the UE, wherein：
Clll, C112 and C113 are Cll homogeneous-frequency adjacent-domains, C121, C122 and C888 are C12 homogeneous-frequency adjacent-domains, C131, C132 and C888 are C13 homogeneous-frequency adjacent-domains, C141, C142 and C888 are C14 homogeneous-frequency adjacent-domains, and C151, C152, C153 and C888 are C15 homogeneous-frequency adjacent-domains.
Set C113, C121, C131, C142 identical with C152 PSC, be all PSC=100, but respective cell ID is different.
Set Clll, C122, C141 identical with C153 PSC, be all PSC=200, but respective cell ID is different.
C888 be it is same ' ", area, it is belonging respectively to C12, C13 and C15 homogeneous-frequency adjacent-domain.Presently described UE is resided in C1, and C1 belongs to the best cell of the signal quality being connected with the UE, and obtained homogeneous-frequency adjacent-domain collection is combined into：
(C888 is repeated, and can only be recorded once by Clll, C112, C113, C121, C122, C888）, C131, C132, C141, C142, C151, C152 and C153
The UE is included by upper detection after detection, wherein target PSC=100, then the corresponding cell of threshold value is distributed as in the homogeneous-frequency adjacent-domain set：
C113, C121, C131, C142 and C152.
Following formula is used respectively to above-mentioned several cells：
X=ABS(((OFFa+Tma)-(OFFb+Tmb))mod 256 - ((Diffa-Tcella)-(Diffb-Tcellb)) mod 256)。
It can finally show that correspondence C131 X values are closest to 0 and namely meet predetermined threshold value and be minimum, can then to confirm C131 cells be exactly the Target cell of presently described UE progress soft handover.By above-described embodiment it can be seen that, RNC is according to the observed time difference eated dishes without rice or wine between each co-frequency cell in the UE UE reported the cell currently connected and homogeneous-frequency adjacent-domain set, and the difference between the theoretical time difference eated dishes without rice or wine in the cell currently connected preserved and homogeneous-frequency adjacent-domain set between each co-frequency cell, when cell to be determined is multiple, it effectively can therefrom determine the Target cell available for soft handover, improve the accuracy rate for determining Target cell, reduce the mortality of soft handover and eliminate co-channel interference.
At present it is determined that the optional set of cells that UE carries out soft handover is mainly the homogeneous-frequency adjacent-domain that the current homogeneous-frequency adjacent-domain that the cell being connected is set up with the UE is namely cell in active set, selectable scope is less, the probability of the situation appearance for adding Target cell of the selection less than progress soft handover that so can be covert, therefore for this technical problem, technical scheme additionally provides a kind of preferred optional set of cells：Homogeneous-frequency adjacent-domain is gathered, and is further defined as the set of cells with different districts ID in the homogeneous-frequency adjacent-domain of UE active set and monitoring collection, because the cell that monitoring is concentrated is also institute in fact
State UE set up connection cell homogeneous-frequency adjacent-domain a part, therefore the homogeneous-frequency adjacent-domain of monitoring collection can be also very big as the possibility of the UE Target cells for carrying out soft handover, thus rationally effective expand has been carried out on the selection range of Target cell, and neighbor cell configuration need not be increased, be not in the negative gain that CCH state PS conversation loss rate deteriorates, and reduce further the mortality of soft handover.Embodiment two
The present embodiment is the corresponding device embodiment of embodiment one, referring to Fig. 3, it is a kind of structure drawing of device of soft-switching device of the invention, including：
Setting unit 300, the surrounding co-frequency cell of a cell for user equipment (UE) currently to be connected is defined as homogeneous-frequency adjacent-domain set；
Explanation is needed exist for, setting unit 300 is when set after, unless needed for definition is gathered to homogeneous-frequency adjacent-domain or scope is modified, otherwise need not trigger during progress operating in soft handover and again setting unit 300.
The cell that UE described here is currently connected can refer to have built up any one in the one or more cells being connected with the UE, in order to determine relative signal quality preferably cell to be determined, technical scheme gives one preferred embodiment, it is specially to choose the best cell of signal quality that the UE currently connects to choose the cell that the UE currently connects, using the best cell of this signal quality as reference, the scope of homogeneous-frequency adjacent-domain set is determined.
At present it is determined that the optional set of cells that UE carries out soft handover is mainly the homogeneous-frequency adjacent-domain that the current homogeneous-frequency adjacent-domain that the cell being connected is set up with the UE is namely cell in active set, selectable scope is less, the probability of the situation appearance for adding Target cell of the selection less than progress soft handover that so can be covert.And the homogeneous-frequency adjacent-domain set of this step, refer to the set of cells with the co-frequency cell around the cell being connected with the UE chosen, such as the cell nearer apart from the cell, in order to determine relative signal quality preferably cell to be determined, technical scheme gives one preferred embodiment, will the surrounding co-frequency cell be further defined as choose the different districts ID set of cells.Moreover, when the best cell of signal quality in the cell that the cell that the UE of selection is currently connected specially currently is connected with the UE, the surrounding is with frequency
The set of cell with different districts ID in cell and active set that cell is concentrated equivalent to the active set including the UE, monitoring and the homogeneous-frequency adjacent-domain that monitoring collects, because the cell that monitoring is concentrated is also a part for the homogeneous-frequency adjacent-domain that be connected cell is set up with the UE in fact, therefore the homogeneous-frequency adjacent-domain of monitoring collection can be also very big as the possibility of the UE Target cells for carrying out soft handover, thus rationally effective expansion has been carried out on the selection range of Target cell, the mortality of soft handover is reduce further.
Receiving unit 301, the same frequency event report reported after the homogeneous-frequency adjacent-domain set is detected for receiving the UE, the same frequency event report includes the observed time difference eated dishes without rice or wine in the main scrambler PSC of target and the cell currently connected and homogeneous-frequency adjacent-domain set between each co-frequency cell；
Need exist for explanation be, the UE is according to set by setting unit 300, detect each cell included in the homogeneous-frequency adjacent-domain set, the PSC of soft handover can be carried out by determining, and according to the data transfer during detection, the observed time difference eated dishes without rice or wine between each co-frequency cell and the selected cell currently connected with the UE in the homogeneous-frequency adjacent-domain set is determined, is subsequently used in case being sent to triggering difference computational unit 303.
Matching unit 302, for the target PSC of acquisition to be matched with the PSC of each co-frequency cell in the set of the homogeneous-frequency adjacent-domain, regard the PSC and co-frequency cell described in the target PSC identicals as cell to be determined；
Need exist for explanation be, the matching unit 302 has just saved the PSC of each cell in networking, therefore the PSC of each co-frequency cell is that the matching unit 302 is chosen from the PSC preserved in homogeneous-frequency adjacent-domain set here, belong to prior art, just repeat no more here.
During being matched, all cells during can disposably the homogeneous-frequency adjacent-domain be gathered are matched, small during can also the homogeneous-frequency adjacent-domain be gathered is divided into several parts and matched successively, and the foundation of division is the distance with homogeneous-frequency adjacent-domain apart from the selected cell currently connected.This matching way can fast and accurately determine cell to be determined.
Matched in the homogeneous-frequency adjacent-domain of the cell currently connected in first gathering the homogeneous-frequency adjacent-domain, if matched with target PSC identical cells, then match and do not continued to be matched behind this cell portion, triggered difference computational unit 303.
If match it is unsuccessful if further gather from the homogeneous-frequency adjacent-domain in active set other cells
Homogeneous-frequency adjacent-domain in matched, if match with target PSC identical cells, matched and do not continued to be matched behind this cell portion, trigger difference computational unit 303.
Further remove and matched after above-mentioned two parts cell in remaining cell from the set of the homogeneous-frequency adjacent-domain if matching is unsuccessful, if matched with target PSC identical cells, then match behind this cell portion, triggered difference computational unit 303.
Difference computational unit 303, for when it is multiple cells with different districts ID that the matching result of the matching unit, which is the cell to be determined, the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference and the cell currently connected and the corresponding cell to be determined of the correspondence cell to be determined to be calculated respectively；
Need exist for explanation be, the theoretical time difference be by networking when the configuration data of each cell obtain and preserve, the difference computational unit 303 is when calculate the difference, and the theoretical time difference is that the difference computational unit 303 is directly obtained from the data of preservation.When being calculated, in addition to other calculations that can calculate the difference, technical scheme provides a kind of calculation of the preferred calculating difference：
X=ABS(((OFFa+Tma)-(OFFb+Tmb))mod 256 - ((Diffa-Tcella)-(Diffb-Tcellb)) mod 256);
Wherein,
A represents the cell currently connected；B represents any one in the cell to be determined.OFFa and Tma numerical value is obtained from the RNC from the FrameOffset and ChipOffset of the UE of preservation Radio Link links.
Obtained during the cell currently connected and the homogeneous-frequency adjacent-domain that OFFb and Tmb numerical value is included in being accused from the measurement on the UE are gathered in eating dishes without rice or wine between each co-frequency cell and the signal transmission time difference of standard interface IUB interfaces.
That is the data in (OFFa+Tma)-(OFFb+Tmb) are to belong to the data related to eating dishes without rice or wine.
Diffa and Diffb numerical value is obtained from NODEB grades of load broadcast, wherein Diffa and Diffb represent BFN and the RFN difference of CELLa and CELLb cells respectively, wherein BFN is the general frame number counter in NodeB, full name is Node B Frame Number, and number range arrives for 0
4095frames o RFN are RNC general frame number counter, and full name is RNC Frame Number, and number range is 0 to 4095fmmes.
Tcella and Tcellb is loaded from cell-level and obtained, wherein Tcell is Supplemental Channel (Supplemental Channel in cell, SCH), CPICH Common Pilot Channel (Common Pilot Channel,) and a time offset of the downlink scrambling code relative to BFN CPICH, span 0 to 9, unit is 256chips.
That is the data in (Diffa-Tcella)-(Diffb-Tcellb) are to belong to and the interface related data of standard interface IUB.
ABS represents absolute value.
Determining unit 304, for when the difference is when meeting predetermined threshold value, it is determined that the cell to be determined of the correspondence difference carries out the Target cell of soft handover for the UE.
That is, when the determining unit 304 detect determine the presently described observed time difference theoretical time difference corresponding with what is preserved closer to, that is the X obtained numerical value is smaller, then it represents that the more suitable Target cell that soft handover is carried out as the UE of the corresponding cell of the observed time difference.
The predetermined threshold value can be according to residing for current UE network area network environment carry out adaptability increase or reduction, so that the final situation that can not determine Target cell occurs in reduction of trying one's best, and reduction determines that the corresponding X of multiple cells to be determined numerical value can meet the situation appearance of predetermined threshold value as far as possible.
It is preferred that,
The determining unit 304, is additionally operable to when there is multiple differences to meet predetermined threshold value, determines that the corresponding cell to be determined minimum in the multiple difference carries out the Target cell of soft handover for the UE.As seen through the above description of the embodiments, those skilled in the art can be understood that all or part of step in above-described embodiment method can add the mode of required general hardware platform to realize by software.Understood based on such, the part that technical scheme substantially contributes to prior art in other words can be embodied in the form of software product, and the computer software product can be stored in storage
In medium, such as R0M/RAM, magnetic disc, CD, including some instructions are to cause a computer equipment (can be network communication equipments such as personal computer, server, or WMG, etc.）Perform the method described in some parts of each embodiment of the invention or embodiment.
It should be noted that each embodiment in this specification is described by the way of progressive, identical similar part is mutually referring to what each embodiment was stressed is the difference with other embodiment between each embodiment.For equipment and system embodiment, because it is substantially similar to embodiment of the method, so describing that cylinder list must be compared, the relevent part can refer to the partial explaination of embodiments of method.Equipment and system embodiment described above is only schematical, the unit wherein illustrated as separating component can be or may not be physically separate, the part shown as unit can be or may not be physical location, a place can be located at, or can also be distributed on multiple NEs.Some or all of module therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.Those of ordinary skill in the art are without creative efforts, you can to understand and implement.
Described above is only the preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (1)
- Claim1st, a kind of soft handover method, its special shame Cui fourth, the surrounding co-frequency cell for the cell that towering ^^ j controllers RNC currently connects user equipment (UE) is defined as homogeneous-frequency adjacent-domain set, and methods described includes：The RNC receives the UE and detects the same frequency event report reported after the homogeneous-frequency adjacent-domain set, and the same frequency event report includes the observed time difference eated dishes without rice or wine in the main scrambler PSC of target and the cell currently connected and homogeneous-frequency adjacent-domain set between each co-frequency cell；The PSC of each co-frequency cell is matched during the RNC gathers the target PSC of acquisition with the homogeneous-frequency adjacent-domain, regard the PSC and co-frequency cell described in the target PSC identicals as cell to be determined；When the cell to be determined is multiple cells with different districts ID, the RNC calculates the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference and the cell currently connected and the corresponding cell to be determined of the correspondence cell to be determined respectively；When the difference meets predetermined threshold value, the RNC determines that the cell to be determined of the correspondence difference carries out the Target cell of soft handover for the UE.2nd, according to the method described in claim 1, it is characterized in that, the RNC calculates the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference and the cell currently connected and the corresponding cell to be determined of the correspondence cell to be determined respectively, including：X=ABS(((OFFa+Tma)-(OFFb+Tmb))mod 256 - ((Diffa-Tcella)-(Diffb-Tcellb)) mod 256)Wherein,A represents the cell currently connected；B represents any one in the cell to be determined；OFFa and Tma numerical value is obtained from the RNC from the FrameOffset and ChipOffset of the UE of preservation Radio Link links；Obtained during the cell currently connected and the homogeneous-frequency adjacent-domain that OFFb and Tmb numerical value is included in being accused from the measurement on the UE are gathered in eating dishes without rice or wine between each co-frequency cell and the signal transmission time difference of standard interface IUB interfaces；The general frame number counter BFN of NodeB and RNC that the acquisition from NodeB grades of load broadcast of Diffa and Diffb numerical value, wherein Diffa and Diffb represent CELLa and CELLb cells respectively lead to With frame number counter RFN differences；Tcella and Tcellb is loaded from cell-level and obtained；ABS represents absolute value.3rd, according to the method described in claim 1, it is characterised in thatWhen there is multiple differences to meet predetermined threshold value, the RNC determines that the corresponding cell to be determined minimum in the multiple difference carries out the Target cell of soft handover for the UE.4th, according to the method described in claim 1, it is characterised in thatThe cell that the UE is currently connected is specially the best cell of the signal qualitys that currently connect of the UE.5th, the method according to Claims 1-4 any one, it is characterised in thatHomogeneous-frequency adjacent-domain set includes the set of cells with different districts ID in the homogeneous-frequency adjacent-domain of a cell and the homogeneous-frequency adjacent-domain of the homogeneous-frequency adjacent-domain that the UE currently connects.6th, a kind of soft-switching device, it is characterised in that described device includes：Setting unit, the surrounding co-frequency cell of a cell for user equipment (UE) currently to be connected is defined as homogeneous-frequency adjacent-domain set；Receiving unit, the same frequency event report reported after the homogeneous-frequency adjacent-domain set is detected for receiving the UE, the same frequency event report includes the observed time difference eated dishes without rice or wine in the main scrambler PSC of target and the cell currently connected and homogeneous-frequency adjacent-domain set between each co-frequency cell；Matching unit, for the target PSC of acquisition to be matched with the PSC of each co-frequency cell in the set of the homogeneous-frequency adjacent-domain, regard the PSC and co-frequency cell described in the target PSC identicals as cell to be determined；Difference computational unit, for when it is multiple cells with different districts ID that the matching result of the matching unit, which is the cell to be determined, the difference of the theoretical time difference eated dishes without rice or wine between the observed time difference and the cell currently connected and the corresponding cell to be determined of the correspondence cell to be determined to be calculated respectively；Determining unit, for when the difference is when meeting predetermined threshold value, it is determined that the cell to be determined of the correspondence difference carries out the Target cell of soft handover for the UE. 7th, device according to claim 6, it is characterised in that the difference computational unit is also used for following formula and calculates the difference：X=ABS(((OFFa+Tma)-(OFFb+Tmb))mod 256 - ((Diffa-Tcella)-(Diffb-Tcellb)) mod 256)Wherein,A represents the cell currently connected；B represents any one in the cell to be determined；OFFa and Tma numerical value is obtained from the RNC from the FrameOffset and ChipOffset of the UE of preservation Radio Link links；Obtained during the cell currently connected and the homogeneous-frequency adjacent-domain that OFFb and Tmb numerical value is included in being accused from the measurement on the UE are gathered in eating dishes without rice or wine between each co-frequency cell and the signal transmission time difference of standard interface IUB interfaces；The acquisition from NodeB grades of load broadcast of Diffa and Diffb numerical value, wherein Diffa and Diffb represent the general frame number counter BFN of NodeB and the general frame number counter RFN differences of RNC of CELLa and CELLb cells respectively；Tcella and Tcellb is loaded from cell-level and obtained；ABS represents absolute value.8th, device according to claim 6, it is characterised in thatThe determining unit, is additionally operable to when there is multiple differences to meet predetermined threshold value, determines that the corresponding cell to be determined minimum in the multiple difference carries out the Target cell of soft handover for the UE.9th, device according to claim 6, it is characterised in thatThe cell that the UE is currently connected is specially the best cell of the signal qualitys that currently connect of the UE.10th, the device according to claim 6 to 9 any one, it is characterised in thatHomogeneous-frequency adjacent-domain set includes the set of cells with different districts ID in the homogeneous-frequency adjacent-domain of a cell and the homogeneous-frequency adjacent-domain of the homogeneous-frequency adjacent-domain that the UE currently connects.
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| PCT/CN2014/072746 WO2015127665A1 (en) | 2014-02-28 | 2014-02-28 | Soft handoff method and related device |
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| CN112312492A (en) * | 2019-08-02 | 2021-02-02 | 华为技术有限公司 | Switching method, system and terminal equipment for switching |
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| CN103229553A (en) * | 2010-12-01 | 2013-07-31 | 高通股份有限公司 | Apparatus and methods for hand-in to a femto node |
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| WO2006084625A1 (en) * | 2005-02-08 | 2006-08-17 | Alcatel Lucent | Method and apparatus for controlling the transmission of radio links in a radio-communication system |
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| CN109548049B (en) * | 2018-11-30 | 2022-05-24 | 华为技术服务有限公司 | Method and device for detecting same scrambling code interference |
| CN112312492A (en) * | 2019-08-02 | 2021-02-02 | 华为技术有限公司 | Switching method, system and terminal equipment for switching |
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