CN101076187A - Method for estimating frequency point quality switched between frequencies in TD-SCDMA telecommunication system - Google Patents

Abstract

The invention comprises: RNC gets the information used for deciding if the IFHO will be executed from the UE measurement result; according to the measurement result from UE, RNC deicide if IFHO will be executed based on overlap; if IFHO will be executed, the IFHO is executed in order to switch UE to another SAPS2b-d; if the measurement result indicates that there is no need to execute IPHO based on overlap; RNC will decide that IFHO will be executed on volume basis; if yes, using Maxi, j{mi, j(IFHO-capacity)}and PRSCi, j>PRSCthreshold to decide if IFHO needs to be used on overlap basis; if the measurement indicates that IFHO is needed on volume basis, then executing IFHO.

Description

The estimating frequency point quality method that is used for switching between frequency in the TD-SCDMA communication system

Technical field

The standard of using in the present invention relates to switch between a kind of cellular communication system medium frequency belongs to wireless communication technology field.

Background technology

TD-SCDMA (TD SDMA) is also referred to as UTRA (Universal Mobile Telecommunications System (UMTS) land wireless access) TDD (time division duplex) 1.28MCPS option, is a so-called 3G (third generation) wireless telecommunication system.TD-SCDMA uses TDMA (time division multiple access) and CDMA as multiple access mode, may there be a plurality of slots with regard to meaning on each single-channel carrier in this with regard to each sending direction, and in each slot, via orthogonal code division from one or more users can transmit or receive data simultaneously, and in the multigap pattern, a user even can take a plurality of time slots.Because TD-SCDMA uses the bandwidth of a 1.6MHz, so it has a lower single-channel carrier capacity.Therefore, a TD-SDMA generally is that (by network operator) carried out by using a plurality of carrier waves.Nonetheless, in order to stop communication link, must carry out relatively continually and switch (IFHO) between frequency owing to overburden worsens.Carry out IFHO and also can be in this reason of coverage, and promptly because subscriber equipment (UE) (a honeycomb Tongxu equipment, for example: mobile phone) (for example: a coverage so-called node B) shifted out a Network Service Access Point (SPA).TD-SCDMA uses rigid handover (from a SPA to another, and the neither one time interval, wherein, this UE keeps in communication with the both) rather than soft handover (comprise a time interval, wherein UE keeps the Tongxu with two or more SPA) keep the connection of the sub-district of the always same single channel best quality of UE.How number be used to define sub-district quantity has technology P-CCPCH RSCP (Primary Common Control Physical Channel received signal code power) definite according to the county.By plot planning after the stage, coverage is by antenna down tilt, gain diagram and Tx (transmission) the power decision of P-CCPCH.The rare change of the power of P-CCPCH.Therefore, the also rare variation of the coverage of sub-district.The plot planning stage has guaranteed that at this P-CCPCH RSCP of sub-district best in each and every one coverage is on an acceptable threshold value.Be in service area at UE on the basis of what position, the P-CCPCH RSCP that all can detected sub-district will react the access cost (power increment that be used for the whole network of both direction) of UE in that position.The slot 1 that begins from the measurement of slot 0 (P-CCPCH use slot) can't be very accurate to the estimated cost the slot 6, but not having other slot under the early stage of the information of this position, on the mean value basis, it will be very sufficient.Allowing UE to enter potential downlink power behind the ad-hoc location increases and is by from the path loss of Serving cell with from the path loss decision of any interfered cell.The P-CCPCH RSCP of Serving cell can only directly react the path loss from Serving cell, but it also can indirect reaction from the path loss of interfered cell.In other words, the P-CCPCH RSCP of Serving cell is influenced by interfered cell, and has indicated the interference from interfered cell.So selecting a sub-district that has best P-CCPCH RSCP in carrier wave to be used for switching between frequency as Serving cell is the UE best choice.But, for switching cell quality standard between frequency, select not best choice always of a sub-district with best P-CCPCH RSCP, because good P-CCPCHRSCP does not need to indicate the low interference of comparing with other sub-district when the slot 0.Therefore, needed is a kind of new decision algorithm, by this algorithm, can select a best sub-district in the handoff procedure between frequency on the basis of minimum access cost.

The content of invention

Purpose of design: provide a kind of one to be to select a decision content relevant or the decision content relevant to be used to judge between the frequency of whether carrying out a user equipment (ue) device to switch as the basis with capacity with covering; The 2nd, judge that whether using selected decision content to carry out between frequency switches.

Design: 1, the decision content relevant with capacity may with the received signal intensity index that is used for sub-district and carrier frequency and and the difference that is used for the received signal chip power of sub-district and carrier frequency be inversely proportional to, or with algebraic method on relevant quantity be inversely proportional to, thereby realize according to similar mode.Therefore, judge that whether carrying out the step of distinguishing exchange between a frequency more may not only be based upon on the decision content relevant with capacity, also is based upon a threshold value that is used for the received signal chip power.2, relevant with capacity decision content may be the received signal chip power that is used for sub-district and carrier frequency, this value is removed with the difference of the received signal chip power that is used for this sub-district and this carrier frequency by a received signal intensity index that is used for sub-district and carrier frequency, perhaps may be quantity relevant on the algebraic method, thereby can realize according to similar mode.Therefore, provide one to comprise the computer-readable storage organization computer program of (including the execution that computer program code can be used for computer processor on it), wherein, according to above-mentioned 1, computer program code comprises the explanation that is used to carry out a kind of mode.3, provide a network element, this network element comprises: the one, and select a decision content relevant or the decision content relevant to be used to judge between the frequency of whether carrying out a user equipment (ue) device and switch as the basis with capacity with covering; The 2nd, judge that whether using selected decision content to carry out between frequency switches.4, provide a kind of device, this device comprises: the one, user equipment (ue) device can receive an indication---will carry out one between frequency measurement and the decision content that will in ranking sub-district and frequency, use an indication; The 2nd, this user equipment (ue) device can be carried out an inter-frequency measurements and arrange the result of different districts and frequency according to decision content; Wherein, decision content can be indicated as decision content relevant with capacity or the decision content relevant with covering.5, provide one to comprise the computer-readable storage organization computer program of (including the execution that computer program code can be used for computer processor on it), wherein, according to above-mentioned 4, computer program code comprises the explanation that is used to carry out a kind of mode.6, provide a kind of user equipment (ue) device, this device comprises: the one, user equipment (ue) device can receive an indication---will carry out one between frequency measurement and the decision content that will in ranking sub-district and frequency, use an indication; The 2nd, user equipment (ue) device can be carried out an inter-frequency measurements and arrange the result of different districts and frequency according to decision content; Wherein, decision content can be indicated as decision content relevant with capacity or the decision content relevant with covering.7, provide a system, this system comprises: above-mentioned 3 network element and a user equipment (ue) device being connected to network element by Radio Link according to the present invention.This user equipment (ue) device should meet the present invention above-mentioned 6.Radio Link can be, for example, and the time division CDMA Radio Link that comprises a TD SDMA Radio Link or a time division duplex wireless link of any kind.

The frequency quality standard decision algorithm that is used for switching between frequency in the technical scheme 1:TD-SCDMA communication system, RNC has obtained to be used to judge the information of whether carrying out IFHO from the UE measurement result, the measurement result that RNC uses UE to provide judges whether carry out IFHO on the covering basis, if carry out IFHO, UE is switched to another SAPS2b～d and can change carrier frequency thereby carry out IFHO; Need not IFHO if measurement result is presented to cover on the basis, RNC can judge whether carry out IFHO on the capacity basis, if use

With ${P_{\mathrm{RSC}}}^{i,j}>{P_{\mathrm{RSC}}}^{\mathrm{threshold}}$ Judge whether judge needs to use among the IFHO on covering the basis; Need IFHO if measure to be presented on the capacity basis, carry out IFHO.

The frequency quality standard that is used for switching between frequency in the technical scheme 2:TD-SCDMA communication system is judged network element, selects a decision content relevant with covering or the decision content relevant with capacity to be used to judge between the frequency of whether carrying out a user equipment (ue) device as the basis and switches; And judge that whether using selected decision content to carry out between frequency switches.

Advantage of the present invention: it takes the possible Cite density contrast of different frequency into account; The capacity that causes IFHO trends towards selecting the carrier wave of a Cite rareness; Disturb because MUD can cancel between most frequency, the single cell capacity that therefore has a rare Cite is big more than continuous covering carrier wave.In addition, handoff algorithms is not influenced by the present invention between frequency, and, need not to change measurement control and measurement report in the inter-frequency measurements.

Description of drawings

Fig. 1 is the applicable system schematic of the present invention.

Fig. 2 is the schematic flow sheet that network entity is carried out.

Embodiment

Embodiment 1: with reference to accompanying drawing 1～3.The frequency quality standard decision algorithm that is used for switching between frequency in the TD-SCDMA communication system, RNC has obtained to be used to judge the information of whether carrying out IFHO from the UE measurement result, the measurement result that RNC uses UE to provide judges whether carry out IFHO on the covering basis, if carry out IFHO, UE is switched to another SAPS2b～d and can change carrier frequency thereby carry out IFHO; Need not IFHO if measurement result is presented to cover on the basis, RNC can judge whether carry out IFHO on the capacity basis, if use

With ${P_{\mathrm{RSC}}}^{i,j}>{P_{\mathrm{RSC}}}^{\mathrm{threshold}}$ Judge whether judge needs to use among the IFHO on covering the basis; Need IFHO if measure to be presented on the capacity basis, carry out IFHO.Whether judge before or after carrying out IFHO on the capacity basis, carry out the judgement order of whether on the capacity basis, carrying out IFHO and should decide according to each RNC4a-b.

The frequency quality standard that is used for switching between frequency in the embodiment 2:TD-SCDMA communication system is judged network element, it is characterized in that: select a decision content relevant with covering or the decision content relevant with capacity to be used to judge between the frequency of whether carrying out a user equipment (ue) device as the basis and switch; And judge that whether using selected decision content to carry out between frequency switches.User equipment (ue) device can receive one will carry out one between frequency measurement and the decision content that will in ranking sub-district and frequency, use an indication; And this user equipment (ue) device can be carried out an inter-frequency measurements and arrange the result of different districts and frequency according to decision content; Wherein, decision content can be indicated as decision content relevant with capacity or the decision content relevant with covering.The decision content relevant with capacity may with the received signal intensity index that is used for sub-district and carrier frequency and and the difference that is used for the received signal chip power of sub-district and carrier frequency be inversely proportional to, or with algebraic method on relevant quantity be inversely proportional to, thereby show according to similar mode.

According to the present invention, comprise a frequency standard or a metering that is used for two kinds of different reasons of IFHO: a kind of link degradation (promptly be used for: UE has shifted out the overlay area of SAP) that coverage causes and reason that is used to transship of being used for thereby improved the IFHO algorithm that is used for TD-SCDMA.With regard to the IFHO that coverage causes, IFHO metering can with prior art in the same, that is to say: M ^{(IFHO-CoveRage)}=P _RSCP wherein _RSCRefer to P-CCPCH RSCP (for a special sub-district I, do not express, for a special frequency j, also express), that is, be used for the signal chip power that has received of P-CCPCH (cell i) above-mentioned.For overload capacity, the IFHO metering is:

M ^{(IFHO-CaPaCity)}＝P _RSd(IRSS-PRSC)

(equally, for a special sub-district 1, do not express above-mentioned, for a special frequency j, also express) be I wherein _RSS=UTRA carrier wave RSSI (received signal volume indicator) is used herein to the wide wavestrip power of indicating slot 0.Other metering that is used for the IFHO capacity measurement also may be depended on the present invention, but advantageously, any IFHO capacity measurement has showed and the M that provides by equation (2) by the relational algebra method＜ ^{IFHo_oaPaoity}The same basic act.

Decision algorithm is used to judge whether carry out the IFHO test that is used for based on the link degradation of overload capacity and covering, and carries out IFHO when any test demonstration should be carried out IFHO.For capacity test, best sub-district I (and with regard to a particular frequencies j)---carry out switch sub-district also be like this---can become and have the highest M ( ^{IFHO_CaPaCity}And have the sub-district of acceptable P-CCPCH RSCP, promptly equation 1: Wherein i has represented a neighbor cell, and j represents frequency, and equation 2: ${P_{\mathrm{RSC}}}^{i,j}>{P_{\mathrm{RSC}}}^{\mathrm{threshold}},$ P wherein _RSC ^ThleSholdBe a P-CCPCH threshold value, be configured to a plurality of dB (deCiBel) greater than minimum required (for example, according to an employing standard) P-CCPCH value.After the capacity limit owing to the sub-district at UE place was switched to another sub-district, the threshold value that equation (4) provides requires to be used to avoid because the link degradation that coverage causes.

For the IFHO judgement that coverage causes, best sub-district can be the sub-district with the highest P-CCPCH RSCP, as M in the prior art or that have the maximum that is used for any IFHO covering metering ^{(FHCO-CoveRage)}The sub-district of value (be typically and have the same basic act) with quantity P-CCPCH RSCP.

According to the present invention, by comprise the mode that is used to arrange the sub-district according to aforesaid two kinds of meterings in the middle of UE, UE is advantageously employed.According to prior art (3GPP TS 25.311,10.3.7.44 part), the measurement report that sends from UE to RNC should be according to RSCP according to from preferably to the poorest sequence arrangement sub-district, as use covering measurement, so, according to the present invention, UE should comprise the function that is used to arrange the sub-district according to following dual mode: be used for IFHO that coverage causes and be used for the IFHO that capacity causes according to capacity measurement according to covering metering.

RNC requires UE to carry out a frequency mass measurement and provides the result according to aforesaid capacity measurement or covering metering then.Can be reinterpreted according to prior art (3GPP TS 25.311,14.2.0a part) down link EC/No and to be used to refer to UE: (for example: P-CCPCH RSCP/UTRA carrier wave RSSI (slot 0) is used for the UTRATDD1.28MCPS option to use aforesaid capacity measurement.Be accompanied by this type of variation, be made as main CCPCH-EC-NO (when opposite with RSCP or path loss, UE should use capacity measurement when measuring quality (as FE-TDD indication, wherein FE refers to frequency quality estimation number).When being set to RSCP, UE should use and cover metering.

In other embodied, RNC received former measurement result from UE, and carried out arrangement according to covering metering or capacity measurement self.In these embodied, UE there is no need to change and uses together with the present invention.

Decision algorithm of the present invention is present among the RRM/HC (RRM/switching controls) of RNC (radio network controller).3GPP TS 25.311 has supported quantity P-CCPCHRSCP and UTRA carrier wave RSSI in the RPC of V500 appointment (Radio Resource control) the measurement report information for a long time.3GPP TS 25.311, among the V500 the 841st page have listed following content and have been used for TDD (time division duplex) as the frequency mass metrology and judge whether carry out IFHO:

Q _iJ＝10.Log(M _iJ)+O _iJ (3)

Q wherein _IJBe illustrated in the estimation quality of the sub-district I on the frequency j, M.. is illustrated in the measurement result that is used for the main P-CCPCHRSCP of sub-district I on the frequency j, represents O with mW; _j-be illustrated in frequency j upward independently to setover (, being called as " independently setovering in the sub-district " by information element setting (IE)) sub-district of current estimative cell i.The frequency mass metrology that can use equation 3 to provide is carried out the present invention, still, and as above-mentioned two the different M of use that need _IjM; j ^{(IFHO_Cove Rage)}Be used for covering M; j ^{(IFHO_CaPaCity)}Be used for capacity.

Fig. 1, thereby install Radio Link that a UE11 can pass through to SAP2a with radio network controller 4a up to central site network 3 (a last communicating terminal or a server, demonstration) sets up wireless telecommunications, wherein SAP2a is in available various carrier frequencies 1, ..., j ..., have a cell i among the N, and use a carrier frequency j.Need to carry out an IFHO (rigid handover to another SAP2b-d, carrier frequency changes therein), this is to be caused by the deterioration in the Radio Link, and the origin cause of formation of this deterioration or be because UE has shifted out cell i (perhaps having moved on to another SAP2b-d occupies advantage on coverage place), perhaps this is owing to user in cell i too much causes.If there is another IFHO, aforementioned according to the present invention, promptly, use a metering that is used to cover and be used for the metering of capacity, this UE can be switched to another SAP2b-d (each provides a sub-district that is different from cell i) and carrier frequency also is changed on another available carrier frequency (depending on that SAP that is chosen as SAP).As what point out above, Radio Access Network can use a plurality of different carrier waves, and can use a plurality of sub-district and use a plurality of (identical or different) in other sub-district.Therefore, the frequency that is used for two sub-districts can be overlapped, also can be overlapping fully, and perhaps not overlapping.Typically, thereby but in all sub-districts, should use a carrier frequency that continuous covering is provided in service area at least, in addition, only when the carrier frequency of using other in the high place of needs.(be noted that the overlay area that is used for the different carrier frequencies of a sub-district there is no need identical in this sub-district.

Fig. 2, judge the process whether carry out IFHO---if like this, so to what sub-district and what frequency---demonstration comprises: the first step 5, wherein, RNC has obtained to be used to judge the information (for example, the communication in the use prior art) of whether carrying out IFHO from the UE measurement result.At next step in 6, whether the measurement result that RNC uses UE to provide is judged covering on the basis and is carried out IFHO, if like this, arrive what sub-district so and arrives what frequency.Can be with equally making this judgement in the prior art, for example, as at 3GPP TS 25.311, issue the same in (with reference to the 841st page) v.500.Should carry out IFHO if result of the test shows, should in 8, UE be switched to another SAP 2b-d at next step so, also therefore can change carrier frequency thereby carry out IFHO.If but measurement result is presented to cover on the basis and need not IFHO, so at next step in 8, RNC can judge whether carry out IFHO on the capacity basis, if like this, arrives what sub-district and what frequency so, this wherein, can use, for example, equation 1 and 2, in any case but, should use one to be different from judging whether to cover and to need on the basis to use among the IFHO.Need IFHO if measure to be presented on the capacity basis, execution in step 8 so: carry out IFHO.Clearly, can judge whether before or after carrying out IFHO on the capacity basis, carry out the judgement of whether on the capacity basis, carrying out IFHO.Order should be decided according to each RNC4a-b.

What need understand is: though the foregoing description is to the present invention's detailed explanation of contrasting; but this this explanation is to simple declaration of the present invention; rather than limitation of the present invention, any innovation and creation that do not exceed in the connotation of the present invention all fall within the scope of protection of the present invention.

Claims (5)

1, the estimating frequency point quality method that is used for switching between frequency in a kind of TD-SCDMA communication system, it is characterized in that: RNC has obtained to be used to judge the information of whether carrying out IFHO from the UE measurement result, the measurement result that RNC uses UE to provide judges whether carry out IFHO on the covering basis, if carry out IFHO, UE is switched to another SAPS2b～d and can change carrier frequency thereby carry out IFHO; Need not IFHO if measurement result is presented to cover on the basis, RNC can judge whether carry out IFHO on the capacity basis, if use

And P _RSC ^{I, j}＞P _RSC ^ThresholdJudge whether judge needs to use among the IFHO on covering the basis; Need IFHO if measure to be presented on the capacity basis, carry out IFHO.

Whether 2, the estimating frequency point quality method that is used for switching between frequency in the TD-SCDMA communication system according to claim 1 is characterized in that: judge before or after carrying out IFHO on the capacity basis, carry out the judgement order of whether carrying out IFHO on the capacity basis and should decide according to each RNC4a-b.

3, the frequency quality standard that is used for switching between frequency in a kind of TD-SCDMA communication system is judged network element, it is characterized in that: select a decision content relevant with covering or the decision content relevant with capacity to be used to judge between the frequency of whether carrying out a user equipment (ue) device as the basis and switch; And judge that whether using selected decision content to carry out between frequency switches.

4, the frequency quality standard that is used for switching between frequency in the TD-SCDMA communication system according to claim 3 is judged network element, it is characterized in that: the family apparatus can receive one will carry out one between frequency measurement and the decision content that will in ranking sub-district and frequency, use an indication; And this user equipment (ue) device can be carried out an inter-frequency measurements and arrange the result of different districts and frequency according to decision content; Wherein, decision content can be indicated as decision content relevant with capacity or the decision content relevant with covering.

5, the frequency quality standard that is used for switching between frequency in the TD-SCDMA communication system according to claim 3 is judged network element, it is characterized in that: the decision content relevant with capacity may with the received signal intensity index that is used for sub-district and carrier frequency and and the difference that is used for the received signal chip power of sub-district and carrier frequency be inversely proportional to, or with algebraic method on relevant quantity be inversely proportional to, thereby show according to similar mode.

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