CN1802805A - Method and apparatus for cell identification for uplink interference avoidance using inter-frequency measurements - Google Patents
Method and apparatus for cell identification for uplink interference avoidance using inter-frequency measurements Download PDFInfo
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- CN1802805A CN1802805A CNA038125277A CN03812527A CN1802805A CN 1802805 A CN1802805 A CN 1802805A CN A038125277 A CNA038125277 A CN A038125277A CN 03812527 A CN03812527 A CN 03812527A CN 1802805 A CN1802805 A CN 1802805A
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Abstract
A method and system for cell identification for uplink interference avoidance that includes a network device and a mobile device in a communications network. Inter-frequency measurements are performed by a mobile device on a downlink-carrier not currently used by the mobile device (S1). A result of the inter-frequency measurements is compared with another value (S2). Second measurements are initiated on the downlink carrier currently not used by the mobile device based on the comparison (S3). A cell is identified based on the second measurements (S4). The inter-frequency measurements may include received signal strength indicator (RSSI) measurements, received signal code power (RSCP) measurements, or average channel power-to-total signal power ratio (Ec/Io) measurements. The second measurements may include signal quality measurements.
Description
Technical field
The present invention relates to cdma system, more particularly, relate to the cell identification of utilizing inter-frequency measurements in the cdma system.
Background technology
In code division multiple access (CDMA) system, soft handover (SHO) scope is characterized by strong pilot power signals (the CPICH Ec/Io in the wideband CDMA (WCDMA)) similarly.Pilot power is measured according to idle pulley and connection mode by mobile device.Under connection mode, importantly mobile device (UE) is connected with best cell all the time.Otherwise, can in up link, cause tangible interference, and the waste network capacity.Under idle pulley, importantly reside in the strongest sub-district, so that allowing to start fast calls out, and calling out between the starting period, can not cause disturbing.
Measure according to down link CPICH Ec/Io by (1), the soft handover in a frequency, perhaps (2) exist under the adjacent-channel interference situation, and down link at first finishes, and can avoid among the WCDMA, to the uplink channel interference of neighbor cell.When as in the UMTS of 2.1GHz core band, when having fixing a pair of up link and down link, these methods work.When the same uplink carrier under the 1.9GHz was can be with the down link under 2.1GHz or the 2.5GHz paired, this method can not be applied to 2.5GHz.So, need new method to avoid uplink channel interference.
Summary of the invention
The invention provides a kind of cell recognition method and system that avoids uplink channel interference, described system comprises the network equipment and the mobile device in the communication network.Mobile device carries out inter-frequency measurements to the current untapped downlink carrier of this mobile device.The result of inter-frequency measurements and another value are relatively.According to relatively, the present untapped downlink carrier of mobile device is started second measure.Discern the sub-district according to second measurement.Inter-frequency measurements can comprise received signal intensity indication (RSSI) measurement, and received signal code power (RSCP) is measured, or average channel power and total signal power ratio (Ec/Io) measurement.Second measurement can comprise signal quality measured.
Description of drawings
Below with reference to accompanying drawing, utilize the non-limitative example of embodiments of the invention, describe the present invention in detail, wherein in the accompanying drawings, identical Reference numeral is represented identical part, wherein:
One according to the present invention illustration embodiment of Fig. 1 shows system for soft handover detection;
Fig. 2 illustration embodiment according to the present invention shows the possible interface scenario in the uplink channel;
Fig. 3 illustration embodiment according to the present invention shows another possibility interface scenario in the uplink channel;
Fig. 4 illustration embodiment according to the present invention shows the mobile node measurement activity during the different mobile node states;
Fig. 5 A and 5B illustration embodiment according to the present invention shows up link and downlink carrier pairing;
Fig. 6 illustration embodiment according to the present invention illustrates the soft handoff range of utilizing rssi measurement and detects;
Fig. 7 is the flow chart according to the process for cell identification of an illustration embodiment of the present invention.
Embodiment
Here Biao Shi details is to be used as the example of embodiments of the invention, and is convenient to the illustrative discussion of embodiments of the invention.The explanation of carrying out makes to one skilled in the art how in practice imbody the present invention will be conspicuous in conjunction with the accompanying drawings.
In addition, for fear of covering the present invention, extremely depend on and to realize the fact of platform of the present invention therein in view of details in addition about the realization of this block diagram scheme, the form representation scheme of available block diagram, that is, in those skilled in the art's the visual field, details should be known.Here stated detail (for example circuit, flow chart), so that describe illustration embodiment of the present invention, it will be obvious to those skilled in the art that not to have putting into practice the present invention under the situation of these details.At last, obviously the combination in any of hardware circuit and software instruction can be used to realize embodiments of the invention, that is, the present invention is not limited to the concrete arbitrarily combination of hardware circuit and software instruction.
Though can in the host unit environment of illustration, utilize the system block diagram of illustration to describe illustration embodiment of the present invention, practice of the present invention be not limited thereto, that is, can utilize the system of other type, in the environment of other type, put into practice the present invention.
In the specification quoting of " embodiment " meaned that special characteristic, structure or the characteristic described about this embodiment comprise at least one embodiment of the present invention.That the appearance in phrase " in one embodiment " each place in specification differs definiteness all is identical embodiment.
Embodiments of the invention relate to the WCDMA inter-frequency measurements.The example extension band (for example 2.5GHz wave band) that is utilized as the WCDMA downlink allocation is illustrated the present invention.But another kind of possibility is to use 1.7 and the band allocation of 2.1GHz wave band.Because the present invention also can cover the new wave band that 1.9GHz operator can have 2.1GHz DL, but not necessarily plan at first to use the situation of 1.7GHz UL.
Fig. 1 has represented the system of soft handover detection according to an illustration embodiment of the present invention.This system comprises communication network 10, and communication network 10 comprises the network equipment or node 12-22 and mobile device (for example subscriber equipment (UE), mobile node (MN) and mobile radio station (MS) etc.) 30-48.Term mobile device, mobile node and subscriber equipment will be used alternatingly in the whole explanation of embodiments of the invention, and refer to the device of same type.
Network equipment 12-22 can be network node or a device of supporting any type of the wireless device be connected with communication network, radio network controller (RNC) for example, base station controller (BSC) etc.The network equipment 12 and mobile device 36 are transmitting data and control information each other by up link 35 and down link 37 channels.Base station or sub-district (not shown) can provide a plurality of frequencies that allow mobile device 36 to select and be used for downlink carrier and uplink carrier from special frequency band.Uplink carrier frequency can be from identical frequency band, perhaps from different frequency bands with downlink carrier frequency.
When mobile device when a position moves to the another location, base station or the sub-district near this mobile device will provide up link and downlink carrier to this specific mobile device probably.In general, if having identical frequency band in adjacent base station, the network equipment can instruct and carry out soft handover between the down link that provides from initial base station and uplink carrier and down link that provides from adjacent base station and uplink carrier so.
According to the present invention, the network equipment 12 and/or the adjacent network device 14 that uses may can detect soft handoff range, thereby can switch under the situation that does not cause uplink channel interference together with mobile device 36 before switching at present.As previously mentioned, do not provide at present when being used for the position of same frequency band of its downlink carrier, can cause uplink channel interference by this mobile device when mobile device moves to.
Each mobile device 30-48 and/or network equipment 12-22 can be termly or are carried out various measurements continuously, so that detect the soft handoff range of avoiding uplink channel interference.For example, can carry out the measurement such as signal strength signal intensity, signal quality, and compare, so that determine whether to exist soft handoff range, and whether should switch, to avoid uplink channel interference with similar measurement from the carrier wave of adjacent or co-located wave band.The network equipment and/or mobile device can be determined the type of the measurement carried out, and when carry out these measurements.In addition, the network equipment and/or mobile device can be carried out described measurement, and under the situation that mobile device is measured, network node can instruct mobile device to measure, and perhaps mobile device is measured under the situation of nothing from the instruction of the network equipment.In addition, mobile device can be measured, and the result is reported to the network equipment, thereby the network equipment determines whether to exist soft handoff range, and whether should carry out soft handover, so that avoid uplink channel interference.
The signal quality of carrier wave (down link or up link) can comprise the interference from other sub-district, and relevant with signal quality at specific mobile device.On the contrary, signal strength signal intensity can comprise all signal sums, and the overall strength under the expression characteristic frequency.With regard to signal strength measurement, there is not any difference between the signal of specific mobile device and other signal.Co-located (co-sited) downlink carrier is the same with the downlink carrier of the current use of mobile device, from the downlink carrier of same antenna or same base or sub-district.
Also can carry out the measurement of relative signal quality.In this method, signal quality can be measured, and with from the signal quality of the downlink carrier of another base station relatively.Difference between the two can be used to determine whether to exist soft handoff range.In addition, use at present current downlink carrier, and the mobile device of shifting to neighbor cell can be sought the downlink carrier from neighbor cell from the frequency band identical with current downlink carrier from current area.If there is not downlink carrier in wave band, if the network equipment and mobile device are known to exist and early switched so, the soft handoff range of uplink channel interference can take place so.
When mobile device is in arbitrary patterns or state, can carry out soft handoff range and detect, for example, mobile device can be in idle pulley, pending data such as perhaps is in or initiatively transmits the connection mode of data.According to the pattern or the state of mobile device, can determine to carry out the measurement (for example inter-frequency measurements) of which type.
A reason of switching is because mobile device has arrived the end of the coverage of the frequency carrier in expansion (for example 2.5GHz) wave band.The end of extension band coverage can be called between wave band, switches between frequency or between system.Trigger criteria can be identical all the time.Owing to can realize quickly switching between wave band, therefore can realize independently activation threshold value.The coverage triggers of some illustrations, for example according to realization of the present invention, can include, but is not limited to switching owing to up link DCH quality, switching owing to UE Tx power, switching owing to down link DPCH power, owing to the switching of Common Pilot Channel (CPICH) received signal code power (RSCP) with owing to the switching of CPICH chip energy/overall noise (Ec/No).
Coverage can be another reason of switching.If: (1) extension band cell has the coverage littler than core bands (=lower CPICH power or different coverage triggers), (2) the core bands coverage termination of using at present (thereby ben also terminates), perhaps (3) UE enters the dead band, can take place so to cover to switch.
Measurement can be another reason of soft handover in the frequency.Soft handoff procedure in the ben substantially can be according to working with branch's interpolation, replacement and delete program with mode identical in core bands.The SHO program can be measured based on CPICH Ec/Io.Although decay is stronger in ben, but for these two wave bands, almost identical as the Ec/Io of ratio.So in principle, identical SHO parameter setting can be used in the ben.But, if not by extra power division, compensation in the ben than overdamp, so SHO measure the reliability of (Ec/Io) can be impaired.In addition, extension band cell may have simultaneously neighbours under the ben frequency and the neighbours under the core bands frequency.Thereby the UE neighbours in the measuring frequency that both have to measure neighbours between wave band again.
The meeting generation is disturbed by the UL of the core bands that the soft HO of the delay that is arranged in the extension band coverage edge causes.Extension band cell may have extension band neighbors and core band neighbor simultaneously.Though standard SHO program is enough to satisfy extension band neighbors,, also has to carry out between the wave bands of enough morning and switch for core band neighbor.Otherwise, in core band neighbor cell, serious UL can take place disturb.The SHO district may be relatively more near the base station, thereby needn't interrelate with UE Tx (emission) power (or base station transceiver (BTS) Tx power).Covering handover trigger may be not enough.
Fig. 2 has represented the possible interface scenario in the uplink channel according to an illustration embodiment of the present invention.Under the situation that adjacent coverage intersects a little, three sub-districts or base station 51,53,55 have been represented.The sub-district 51 of the leftmost side provides two frequency bands of co-located, an extending bandwidth 60 and a core band 54.Middle sub-district 53 also provides the frequency band of two co-located, an extending bandwidth 52 and a core band 56.55 of the sub-districts of the rightmost side provide a core band 58.
In this illustration embodiment, the downlink carrier that mobile device (UE) 50 is using from extending bandwidth 52, extending bandwidth 52 is near the base station 53 of mobile device 50.When mobile device 50 53 left side moves from the base station, and when approaching the cell coverage area overlay region, this mobile device uses UL and the DL carrier wave from adjacent cell (i.e. sub-district 53, centre and sub-district, the rightmost side 55).Usually, if mobile device 50 is using UL and DL carrier wave in the ben (for example starting from the frequency band of about 2.5GHz), in case mobile device 50 moves towards the coverage of contiguous extension band cell so, between the DL of adjacent cell and UL carrier wave soft handover will take place.But, under situation about not existing as the contiguous extension band cell shown in here, soft handover can not take place, because mobile device 50 must obtain DL and UL carrier wave from core bands (for example starting from the frequency band of about 2GHz) sub-district now.This can cause the interference in the UL carrier wave (not shown) of adjacent cell.But, according to the present invention, the network equipment can monitor this situation, and the different DL carrier waves in the existing wave band of selection early, so that allow the soft handover of the core bands 58 (for example 2.0GHz) of ben 52 (for example 2.5GHz) in the adjacent cell 55 from middle sub-district 53, so, avoid may disturb in the UL carrier wave of adjacent cell 55.
Fig. 3 has represented another possibility interface scenario in the uplink channel according to an illustration embodiment of the present invention.In this illustration embodiment, the downlink carrier that mobile device (UE) 50 is using from core band 58, core band 58 is from base station 55.Mobile device can not proceed to the soft handover from the ben 52 of base station 53, because mobile device 50 will be jumped into possible interference range, causes the UL channel disturbance.According to the present invention, this situation is detected, and carries out the judgement about the switching of avoiding the UL channel disturbance early.
Connect setting for fear of directed RRC and enter interference range, UE (user's set) need report the neighbours that record in the core bands in RACH message.Message attachment can still need be activated by standardization.Network node (for example radio network controller (RNC)) needs subsequently to check that all sub-districts that record have the co-located neighbours in the ben.
If the FACH in the core bands decodes successfully, carry out the directed adjacent cell before that is provided with so automatically and disturb (ACI) to detect.For owing to ambulant congested, except directed RRC connects setting, also need load-reason (reason) to switch.Load-reason in the current realization is switched by UL and DL dedicated trigger device and is started.By activation threshold value is set, operator can the control load equilibrium:
-for RT user's load threshold, in UL, with respect to target received power (PrxTarget), the gross power that BTS receives, in DL, with respect to target transmit power (PtxTarget), total transmitting power of BTS;
-for NRT user: at UL﹠amp; Among the DL, the ratio of unaccepted requests for capacity;
-orthogonal code lacks.
In the 2.5GHz operation, the UL load comes equilibrium by switching between frequency and between system only, and the DL load also can come balanced by switching between wave band.Thereby, when considering to switch (UL remains unchanged) between wave band, have only the DL triggering to be only important.
So Fig. 2 and 3 is illustrated in ben (for example, frequency starts from the wave band of the about 2.5GHz) edge cell, both needed to be used for interior measurement of frequency of soft handover, need cline frequency measurements (CM) again.In core bands (for example, frequency starts from the wave band of about 2.0GHz) in the SHO district, a kind of approach that assurance avoids UL to disturb is the core bands DL CPICH Ec/Io in the sub-district (being coverage edge cells) that needs of persistent surveillance, if and detected SHO district in the core bands, would start between wave band so and switch.
On the contrary, if core bands in the SHO district, in the sub-district on the basis that constitutes the extension band coverage edge cell, can not take place and switch between the wave band of ben in UE so.Specifically, in the core bands, switch between the load/service reason wave band during the SHO and be not allowed to.In addition, the core bands that is caused by unsuccessful soft handover (branch's interpolation) program can be under an embargo to switching the wave band of ben, but HO between tolerance frequency.
The UL that compact model also can be used to avoid side channel protection (ACP) to cause disturbs.Approach in the UE position under the situation at adjacent wave segment base station, under some UE Tx power stage, the UL interference that ACP causes can take place.This mainly is grand-micro base station scenario.If work under adjacent extension band carrier in the base station of being disturbed, in DL, it can be protected so, otherwise can not be protected.
Adjacent-channel interference (ACI) probability is directly relevant with the transmitting power of mobile device.Under some power, mobile device can not disturb femto cell, does not need Interference Detection.The reasonable value of power threshold that determines when the beginning Interference Detection need be considered the statistical probability of MCL (minimum coupling loss) situation, and the side channel leakage power is than (ACLR), miniature BTS noise level and desensitization.If power is about average UE Tx power (=-10 ... 10dBm) or higher, the number of the mobile device that continues to check that ACI disturbs can significantly reduce.
The base station of being disturbed can not be protected it oneself to avoid ACI and disturb.The interference mobile device must stop at the emission on its current wave band voluntarily.Have only by operation equally in ben, the base station of being disturbed just can obtain self-protection.
As for the compressed mode operation in the ben (Cell_DCH), when UE just operates in ben, and when needing measurement core DL wave band, the CM in the core bands uses can be by normal use, but the equilibrium independent triggers inter-frequency measurements of UL load.As previously mentioned, when UE was in ben, the reason that CM measures between wave band had several.
Because therefore the DL load aware of another wave band under the situation of high capacity, replaces switching between wave band, the network equipment (for example RNC) can directly start between frequency or between system and switch.Subsequently, can carry out between independent frequency/system's measurements.In order making minimum to be reduced in the influence of network performance, need to use CM very effectively, and a kind of consistent CM usage policy need to cover all wave band measurements.The most extreme CM uses from " ACI detection " and " detection of SHO district ".Under their situation of needs, the two all is continuous.By the intelligent allocation of carriers in the ben,, the two can be avoided greatly perhaps by the network planning.
Allocation of carriers can be protected most carrier waves.Have only when existing operator ben (for example 2.5GHz) is disposed when loseing interest in, the adjacent carrier wave of UL just needs ACI to detect, and disturbs to protect another carrier wave to avoid UL.In addition, if operator wishes to have the extension band carrier of different numbers, so, at a time, in ben, the UL carrier mode may no longer be repeatably.In addition because first operator may be not use its subcarrier in same geographical area, and with the identical time of second operator, therefore whenever protection is not provided, when avoiding the influencing of the adjacent carrier wave of ben, need ACI to detect.
UL carrier wave in the TDD wave band can be subjected to automatic protection, because have only when disposing ben, just has the UL carrier wave.But the adjacency between TDD wave band and the UL wave band pays particular attention to, because if a UL carrier wave (going back) is not worked in ben, a UL carrier wave can be subjected to the 2nd UL carrier-in-interference equally so.
Detect as for the SHO district, by the number of restriction extended coverage range edge cell with by RNP parameter indication edge cell, the network planning can reduce the needs of CM.Repeat fully in last wave band if be divided into fan-shaped sub-district in the core bands, that is, do not have the soft handover area among the UL that is not the soft handover area in the ben, can realize the detection in SHO district according to UE transmitting power or CPICH Ec/Io.But, more be difficult to determine threshold value here because do not exist the base station can be each other how approaching general restriction.Almost complete if desired extension band coverage is not kept at single-site so, should be wise but make coverage complete as far as possible.In addition, sparse capacity extension by reducing the CPICH pilot power or using different covering switching thresholds, can consider to have the less coverage in the extension band cell so if desired.This has reduced the average UE transmitting power in the sparse sub-district, unnecessarily enters UL SHO district thereby reduced the probability of ACI or reduced.
Do not relate to the network planning, still have some sub-districts of all reasons that wherein cause CM.Here, it is efficient CM to be used.
The nearly all reason of CM requires relevant DL core bands, the measurement of the relevant DL core bands of self sub-district or adjacent cell.By the received signal intensity indication (RSSI) of adjacent carrier wave in the measure core band, also can obtain ACI and detect.If both needed the SHO district to detect, need ACI to detect again, so the both depend on that Ec/Io measures may be more effective, as long as back one is measured can finish fast enough.For two reasons, this can realize: it is that the fact of chip synchronization (supposes that they are all in identical base station cabinet that the CM in (1) ben operation can utilize ben DL and core bands DL, promptly be positioned at same position), (2) these two DL wave bands all have identical or closely similar at least propagation path, difference only is that for ben it is stronger to decay.
Two kinds of selections that chip energy/system noise is measured can comprise: the ratio of (1) measure core band average channel power and total signal power (Ec/Io) (because the cause of chip synchronization, very quick)-more precisely, the measurement interval that needs 4-5 time slot, (2) measure core band RSSI, and use two between the wave band CPICH Ec correlation=＞measurement that Ec/Io-needs 1-2 time slot at interval.
Because short at interval cause, second kind of selection is more desirable.In essence, if consider two relative differences between the DL RSSI, even do not need level (level) to measure (Ec/Io).Network one side's uncertainty (antenna mode/gain, cable loss, load capacity, PA grade, propagation loss/diffraction), and UE one side's uncertainty (certainty of measurement) meeting interference ratio is, if possible, need take in.
If detect RSSI than big-difference (the perhaps low Ec/Io in the core bands), can examine reason by following content so:
-measure the neighbours of associated core cell-＞switch between SHO district if (little i) realization wave band;
If-measure adjacent channel RSSI-＞ACI to realize HO between frequency;
-above-mentionedly all be false-＞without any need for action (load of associated core cell may be higher).
Under the situation of (a), directly switch with respect to the SHO district.This requirement after the direct-cut operation, is added branch fast enough between wave band.
In addition, trigger CM by UE velocity estimation value and use, CM is used reduce to minimum with a certain type.If UE does not move, can stop CM so, when UE was mobile once more, CM proceeded.
With regard to when using ben, the measurement that the sub-district is reselected, as long as the Ec/Io signal is enough good, the UE that is in idle pulley just resides in the ben.Under connection mode, in certain time inertia (NRT) afterwards, Cell_FACH, UTRAN Acceditation Area route district's paging channel (URA_PCH), perhaps Cell_PCH state are transferred in the PS service.Subsequently, idle mode parameters may system sub-district gravity treatment.For the reason of coverage, that is, when the coverage of ben terminates, the sub-district gravity treatment can take place subsequently.
Under state, need provide Interference Detection in addition, with the UL interference that prevents to cause by the RACH transmission by idle mode parameters control.Here, can detect the different mechanism of using to ACI and SHO district.
Idle pulley (and Cell_PCH, URA_PCH) detect and can be realized by two pacing amounts in the SHO district under, and be applied to coverage edge cells: the absolute Ec/Io threshold triggers of (1) cell-specific step, whether (2) measure core band exists the sub-district of neighbours between the wave band that does not have in the ben.In order to compare, UE need know the core band neighbor of co-located.This need be added in the extension band broadcast channel system information (BCCH SI).Under the Cell_FACH state, measure opportunity by utilizing IF, and check that whether neighbours in the core bands have the co-located neighbours in the ben, can detect the SHO district.Equally, need extra BCCH information.
Fig. 4 shows the mobile node measurement activity in different mobile node states according to an illustration embodiment of the present invention.The different conditions of having represented mobile device at the arrow that is positioned at Fig. 4 top.Mobile device can be in idle condition, sub-district FACH state or sub-district DCH state.Timeline shown in Fig. 4 is divided into two halves, and first half representative detects the measurement in soft handover (SHO) district, and the Lower Half representative detects the measurement of adjacent-channel interference (ACI).In drawing frame (call-out), represented about each zone, and the various measurements and the timeline that during every kind of state of mobile device, take place.
Under idle pulley, can not detect ACI, but before being right after the RACH transmission,, detect ACI by two vicinities (adjacent) carrier wave in the direct measure core band.Because rssi measurement is very fast, so the delay of RACH transmission aspect can be left in the basket.Under the Cell_FACH state, can provide ACI to detect by the adjacent core bands carrier wave of continuous measurement (stealing the time slot of rssi measurement).
With regard to the SHO district, UE can start to interior switching of wave band of core bands.Under the situation that detects ACI, be similar to conventional coverage reason sub-district gravity treatment, UE can start and switch (UL change) between frequency.
Fig. 5 A and 5B show the pairing of up link and downlink carrier according to illustration embodiment of the present invention.Up link and downlink carrier from existing wave band can be the frequency that is provided by same cells usually, but also can supply with from different sub-districts.Similarly, the make a fresh start up link of wave band and downlink carrier can be the frequency of supplying with from same cells (being different from that sub-district that existing frequency band is provided).A1, A2, A3 ... represent different uplink/downlink frequencies pairings.The frequency that starts from the square frame of each wave band of " A " can be by the operator's control that is positioned at the sub-district, and the frequency in the blank square frame can be by second the operator's control that is positioned at the sub-district, and the frequency in the square frame of deepening can be by the 3rd the operator's control that is positioned at the sub-district.
In the embodiment of these illustrations, existing uplink band is expressed as comprising the frequency that starts from about 1920MHz, existing downlink band is expressed as comprising the frequency that starts from about 2110MHz, and new up link and downlink band are expressed as comprising the frequency that starts from about 2500MHz.But the present invention is not limited by these frequency values, on the contrary applicable to arbitrarily may frequency band.Frequency shown in Fig. 5 A and the 5B just is used to illustrate, and does not limit the scope of the invention.
Fig. 5 A represent mobile node (UE) can with the uplink carrier frequency from existing uplink band 60, the illustration embodiment that is connected with downlink carrier frequency from existing downlink band 62.Existing downlink carrier band 62 can be the core bands from the sub-district of the position of approaching mobile node most.Network node can determine that mobile node should select second downlink carrier, and the instruction mobile node begins a downlink carrier in the frequency in the downlink band 64 of that be used to make a fresh start or different (that is, from different districts).Mobile node uses the uplink carrier from existing wave band 60 subsequently, with the downlink carrier of that make a fresh start or different downlink band 64.
Fig. 5 B has represented the illustration embodiment of the downlink carrier of the initial downlink band 68 of using the uplink carrier of the uplink band 66 of making a fresh start and making a fresh start of mobile node.New uplink band can be from identical frequency band (for example start from about 2.5GHz, the some of them frequency be used to uplink carrier, and some frequencies are used for downlink carrier) with new downlink band.In this illustration embodiment, network node can instruct mobile device to switch, and use different, but the same with initial downlink carrier, from the downlink carrier of same frequency band.New uplink band 66 can be by identical sub-district with the frequency in the new downlink band 68, and perhaps different sub-districts provide.
According to embodiments of the invention, can carry out inter-frequency measurements, so that discern the sub-district and avoid possible disturbed condition.At the beginning, carry out the inter-frequency measurements of the sub-district of co-located.These measurements can comprise received signal intensity indication (RSSI) measurement (1-2 slot time), received signal code power (RSCP) is measured (4-5 slot time), average channel power and total signal power ratio (Ec/Io) measurement (4-5 slot time) etc.Preferred rssi measurement, because owing to they do not need only to need to measure gross power synchronously with any of other carrier wave, so these measurements are very fast.This measurement can be finished in 1-2 time slot.Subsequently, according to measurement result, can discern the sub-district under other frequency.This need spend more time, because mobile device need from synchronizing channel (S-SCH) and/or Primary Common Pilot Channel (P-CPICH), be discerned the timing of scrambling code and sub-district by utilizing primary synchronization channel (P-SCH).In general, this measurement can be activated by the network equipment under the compact model (for example, radio network controller (RNC)).
Can be mobile device definition event-triggered reporting, thereby, just report rssi measurement in case measurement result surpasses predetermined value.The report threshold value can mobile device emission (Tx) power be the basis.
If inter-frequency measurements (for example RSSI) is not indicated any strong signal under this frequency, the sub-district under Shi Bie other frequency can be skipped so.Whether inter-frequency measurements also can make up with the information (for example load) in the network, need to be identified so that determine the sub-district under other frequency.
Fig. 6 is according to an illustration embodiment of the present invention, and graphic extension utilizes the soft handoff range of rssi measurement to detect.Fig. 6 has represented the x axle of representative position (that is, mobile device moves) and has represented the y axle of RSSI.Article two, curve 100,102 is represented respectively about the frequency on the channel 1 of the frequency on the channel 1 of first sub-district 106 and second sub-district 108, at the measure R SSI of assigned address.Dotted line 104 representatives are in the thermal noise level of mobile device.As can be seen from Figure 6, when mobile device moves, begin to descend with respect to RSSI from the frequency 102 of second sub-district 108 from the RSSI of the frequency 100 of first sub-district 106.The threshold value of the frequency that inter-frequency measurements (being RSSI in this example) and measurement result and mobile device use at present or the comparison (shown in here) of measured value can show another sub-district, the existence of sub-district 2,108 (i.e. second sub-district).So, can start switching, to avoid uplink channel interference.
(example detects about soft handoff range will to use two examples below, another example detects about adjacent-channel interference), further illustrate inter-frequency measurements (specifically, in this illustration embodiment, be RSSI) can be used to before up link can cause interference problem, detect the existence of down link.
With regard to first example, when using ben (for example 2.5GHz) down link to connect, down link CPICH Ec/Io measures the soft handover area that can not be used to detect the edge that is positioned at extension band coverage.So mobile device need carry out periodic inter-frequency measurements to continuous covering core bands (for example 2.1GHz) downlink carrier.The present invention can be used to trigger compact model and measure, thereby reduces the Measuring Time of compact model.If the rssi measurement under the 2.1GHz shows existence than under the 2.5GHz, higher received signal power, its reason can be another sub-district under same frequency so.
For example, suppose: mobile device noise level=100dBm, UE maximum uplink power=21dBm, BTS minimum emissive power CPICH=33dBm, when mobile device can detect DL ch1 neighbours, maximum interference level=21-(33+100) that mobile device can cause in up link=-112dBm, it is lower than the BTS noise level.So we can infer that rssi measurement can show the existence of other sub-district in this sub-district before mobile device can cause disturbing.
With regard to second example, when using the 2.5GHz down link to connect, because the cause of 2.1GHz adjacent-channel interference down, down link can the line of fall, and mobile device is understood the up link of the adjacent carrier under the disturbed one .9GHz.For example, suppose mobile device noise level=100dBm once more, mobile device maximum uplink power=21dBm, mobile device ACS and ACLR=33dB, BTS minimum emissive power CPICH=33dBm (supposing) about the worst case that is subjected to interference base station, when mobile device can detect other base station, maximum interference level=21-33-(33-33+100) that mobile device can cause adjacent carriers in up link=-112dBm, it is lower than the BTS noise level.So we infer that rssi measurement can show the existence of side frequency before mobile device can cause disturbing in this sub-district.
Fig. 7 represents the flow chart of process for cell identification according to an illustration embodiment of the present invention.Mobile device carries out inter-frequency measurements (S1) to the present untapped downlink carrier of mobile device.The result of inter-frequency measurements and another value be (S2) relatively.According to relatively, the present untapped downlink carrier of mobile device is started second measure (S3).Measure identification sub-district (S4) according to second.
Inter-frequency measurements can comprise received signal intensity indication (RSSI) measurement, and received signal code power (RSCP) is measured, or average channel power and total signal power ratio (Ec/Io) measurement.Second measurement can comprise signal quality measured.
The result of inter-frequency measurements can with threshold value, perhaps compare with value from the measurement of the downlink carrier of the current use of mobile device.In addition, by the network equipment, for example radio network controller (RNC) or base station controller (BSC) can be to the results of network-reporting inter-frequency measurements.
Can start more detailed inter-frequency measurements.These detailed measurements can comprise the compact model measurement.Subsequently can be according to more detailed inter-frequency measurements, the identification sub-district.Detailed inter-frequency measurements can comprise signal quality measured, and for example CPICH Ec/Io measures.
This value can perhaps according to the current network condition, perhaps according to the characteristic of mobile device, dynamically arrange by the network equipment in advance in the mobile device setting.
The downlink carrier of the current use of mobile device can be in extending bandwidth, for example in starting from the frequency band of about 2.5GHz.The downlink carrier of mobile device use can be in core band, for example in starting from the frequency band of about 2GHz at present.
By utilizing primary synchronization channel (P-SCH), from synchronizing channel (S-SCH) or Primary Common Pilot Channel (P-CPICH), the scrambling code and the timing of identification sub-district can be discerned the sub-district.In addition, the network equipment or mobile device can start the identification of sub-district.
The invention has the advantages that it is convenient to avoid the serious disturbance situation.In addition, uplink channel interference according to the present invention avoid allowing the making a fresh start new frequency of wave band is used to up link and downlink carrier.
Notice that previous example just is used to illustrate, never should be understood as that limitation of the present invention.Though with reference to preferred embodiment the present invention has been described, show that words used herein are illustrative and illustrative words, rather than words of limitation.Under situation about not departing from the scope of the present invention with spirit, can in the scope of the accessory claim that provides at present and revise, make various changes.Though here with reference to specific method, material and embodiment have illustrated the present invention,, the present invention is not limited to details disclosed herein, and on the contrary, the present invention extends to functional equivalent, all structures in the accessory claim scope, methods and applications.
Claims (28)
1, a kind of cell recognition method that is used to avoid uplink channel interference comprises:
Mobile device is carried out inter-frequency measurements to the current untapped downlink carrier of described mobile device;
The result of more described inter-frequency measurements and another numerical value;
According to described comparison, start for second of the present untapped downlink carrier of described mobile device and measure; With
Discern the sub-district according to described second measurement.
2, in accordance with the method for claim 1, the result and the threshold value that also comprise more described inter-frequency measurements.
3, in accordance with the method for claim 1, the measured value that also comprises the downlink carrier of the result of more described inter-frequency measurements and the current use of described mobile device.
4, in accordance with the method for claim 1, also comprise the result who reports inter-frequency measurements to the network equipment.
5, in accordance with the method for claim 1, also comprise starting more detailed second measurement that utilizes compact model to measure, and discern the sub-district according to described more detailed second measurement.
6, in accordance with the method for claim 1, wherein said second measurement comprises signal quality measured.
7, in accordance with the method for claim 6, the wherein said signal quality measured CPICHEc/Io that comprises measures.
8, in accordance with the method for claim 1, comprise that also the network equipment is provided with described numerical value in advance in described mobile device.
9, in accordance with the method for claim 1, the downlink carrier of the current use of wherein said mobile device is in extending bandwidth.
10, in accordance with the method for claim 9, wherein said extending bandwidth comprises the frequency that starts from about 2.5GHz.
11, in accordance with the method for claim 1, the current untapped downlink carrier of wherein said mobile device is in core band.
12, in accordance with the method for claim 11, wherein said core band comprises the frequency that starts from about 2GHz.
13, in accordance with the method for claim 1, also comprise by utilize at least primary synchronization channel (P-SCH), from one of synchronizing channel (S-SCH) and Primary Common Pilot Channel (P-CPICH) identification the sub-district scrambling code and timing, discern the sub-district.
14, in accordance with the method for claim 1, the wherein identification of network equipment startup sub-district.
15, in accordance with the method for claim 1, wherein said inter-frequency measurements comprises received signal intensity indication (RSSI) measurement.
16, in accordance with the method for claim 1, wherein said inter-frequency measurements comprises received signal code power (RSCP) measurement.
17, in accordance with the method for claim 1, wherein said inter-frequency measurements comprises average channel power and total signal power ratio (Ec/Io) measurement.
18, a kind of cell identification system that is used to avoid uplink channel interference comprises:
The network equipment in the communication network; With
Mobile device, described mobile device operationally is connected with described communication network, and uses downlink channel,
Wherein said mobile device is carried out inter-frequency measurements to the current untapped downlink carrier of described mobile device, result and another numerical value of described inter-frequency measurements are compared, according to described comparison, startup is measured second of the present untapped downlink carrier of described mobile device, and discerns the sub-district according to described second measurement.
19, according to the described system of claim 18, the result and the threshold value of wherein said inter-frequency measurements compare.
20, according to the described system of claim 18, the measured value of the downlink carrier of the result of wherein said inter-frequency measurements and the current use of described mobile device compares.
21,, wherein report the result of described inter-frequency measurements to the described network equipment according to the described system of claim 18.
22,, wherein start more detailed second measurement that utilizes compact model to measure, and discern the sub-district according to described more detailed second measurement according to the described system of claim 18.
23, according to the described system of claim 18, wherein said second measurement comprises signal quality measured.
24, according to the described system of claim 18, the wherein said network equipment comprises one of radio network controller (RNC) and base station controller (BSC).
25, according to the described system of claim 18, wherein from current downlink channel initiate to switch between frequency and system between one of switch, thereby avoid interference in the current untapped uplink channel of described mobile device.
26, according to the described system of claim 18, wherein said inter-frequency measurements comprises received signal intensity indication (RSSI) measurement.
27, according to the described system of claim 18, wherein said inter-frequency measurements comprises received signal code power (RSCP) measurement.
28, according to the described system of claim 18, wherein said inter-frequency measurements comprises average channel power and total signal power ratio (Ec/Io) measurement.
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| US37581302P | 2002-04-29 | 2002-04-29 | |
| US60/375,813 | 2002-04-29 | ||
| US10/421,892 | 2003-04-24 |
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| CN1802805A true CN1802805A (en) | 2006-07-12 |
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| CNA038125277A Pending CN1802805A (en) | 2002-04-29 | 2003-04-25 | Method and apparatus for cell identification for uplink interference avoidance using inter-frequency measurements |
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