CN1860740A - Method and apparatus for congestion control in high speed wireless packet data networks - Google Patents
Method and apparatus for congestion control in high speed wireless packet data networks Download PDFInfo
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Abstract
A wireless communication network includes a base station system that transmits sector congestion information to influence mobile station sector selection processing. In an exemplary embodiment, where at least some of the mobile stations being supported by the network autonomously select the network sector from which they wish to receive forward link packet data transmissions, an exemplary base station influences that sector selection processing by transmitting congestion information on a per sector basis. Complementing that transmission by the network, an exemplary mobile station incorporates consideration of the sector congestion information into its autonomous sector selection processing logic. Thus, where potentially large numbers of mobile stations individually select the 'best' sector from a candidate set of sectors, the network can perform load balancing by advertising sector congestion levels, so that mobile stations can choose (or avoid choosing) a given sector based at least in part of the congestion information.
Description
Related application
[0001] the application requires from following U.S. Provisional Application No. according to 35U.S.C § 119 (e): the patent application serial numbers No.60/507 that on September 30th, 2003 submitted to, 417, the patent application serial numbers No.60/527 that submitted on December 8th, 2003,846 and the patent application serial numbers No.60/530 that submits on December 17th, 2003,859.These applications are introduced for your guidance by integral body at this.
Background of invention
[0002] the present invention generally relates to cordless communication network, relates to facility particularly and carry out autonomous sector selection by the mobile radio station of operating in this network.
[0003] shares Packet Data Channel based on the cordless communication network utilization of IS-2000 standard series and provide the forward link packet data business to a plurality of mobile radio stations with two-forty.Usually, the Packet Data Channel of launching in each sector this sector of serving as reasons provides each mobile radio station carrying data of service, and is used for providing for each mobile radio station the function of the specific wireless state of reservation power that the data rate of service can be used for being assigned to this shared Packet Data Channel typically and this mobile radio station.The network of other type provides the shared channel of similar support high-rate service, for example, for inserting (HSPDA) channel based on high data rate (HDR) channel (referring to the IS-856 standard) of the system definition of 1 * EV-DO with by the high-speed downlink packet of wideband CDMA (W-CDMA) standard definition.
[0004] high speed business on the shared channel of these types feature is: each mobile radio station independently selects to provide for it the particular network sector of service.By allowing autonomous serving sector to select, each mobile radio station can select to be used on shared channel to provide for it one of candidate's available sector " best " of service.The signal strength signal intensity of the pilot signal that mobile radio station receives by each sector in the candidate sector collection that service is provided for this mobile radio station is relatively usually selected best serving sector, and the candidate sector collection for example is can be by " active set " of the network sector of network-assigned or control.May speed be provided on the position of service with the highest by in the candidate sector collection, selecting to provide the sector of highest received signal intensity, make on the mobile radio station surface to lay oneself open to.
[0005] when the accepting state of mobile radio station changes, thereby it can " move " another sector as selection of new serving sector by its another sector that will collect interior of signaling.Though the mechanism that is used for making like this may be owing to network type changes, the IS-2000 network has used and has been used for carrying out the exemplary mechanism that serving sector is selected by each mobile radio station.
[0006] according to the IS-2000 method, each mobile radio station that is provided service on shared channel provides channel-quality feedback to the network that is used for being provided with for this mobile radio station service data rate.Typically, the form of reporting with the channel quality indicator (CQI) of every 1.25ms (800HZ) transmission at the mobile radio station of sharing participation Packet data service on the Packet Data Channel provides this feedback.Mobile radio station is used with its current service sector corresponding (Walsh) coding and is come " covering " its CQI report.When this mobile radio station was wanted to change to new serving sector, it was brought into use with target sector corresponding (Walsh) coding and comes alternately " coverings " its CQI to report.After a period of time, this mobile radio station switches to the shared Packet Data Channel of target sector (it is new serving sector now), and this network begins to launch the forward link data that is used for this mobile radio station on the shared Packet Data Channel of new sector.
[0007] allow mobile radio station dynamically to select (and gravity treatment) serving sector just to allow the individual mobile radio station in each mobile radio station to select the sector that optimum signal quality is provided to them in the above described manner.Yet, on mobile radio station, select simply with the corresponding sector of optimum receiving signal quality and guarantee that not necessarily this mobile radio station obtains best possible shared channel business, because on the shared channel of given sector, depend on many factors for this mobile radio station provides the speed of service, for example, the congestion level of sector.That is to say that very congested sector can not be to be that mobile radio station provides service with the same high speed in congested lighter sector, although it can provide stronger received signal on this mobile radio station.
[0008] in addition, because shared channel user (mobile radio station) independently changes serving sector and selects, legacy network is not from congested sector " cut-out " shared channel user's mechanism or prevent that other shared channel user from selecting any mechanism of the sector of excessive congestion.Therefore, under the situation of carrying out " load balancing " (wherein the shared channel user is left from more congested network sector guiding, and guide congested lighter sector into) without any direct ability, the legacy network abandoned.
Summary of the invention
[0009] the present invention includes a kind of autonomous sector selection method of operating and equipment that can make the cordless communication network influence by the mobile radio station of this network support.More specifically, this network emission sector congestion information is selected with the sector that influences mobile radio station.Because network provides sector congestion information, so mobile radio station can be incorporated into this information in their the sector selection decision logic.Like this, mobile radio station can avoid selecting the sector of heavy congestion, perhaps can select the new serving sector of congested lighter sector as it.Certainly, the selection that is included in the mobile radio station is handled and can fully be improved, and for example combination of sector signal quality between each candidate sector and sector congestion levels value based on the comparison.In addition, perhaps replacedly, mobile radio station can use the probable value of one or more appointments to come control break to arrive the probability of better sector.Such probabilistic information can be transmitted into mobile radio station with the form of probability tables (for example, can be used in the probability tables that the sector reselection probability is set).
[0010] from the viewpoint of network, comprise for mobile radio station provides the exemplary method of sector congestion information: each in the one or more sectors that can independently select for mobile radio station, the forward link data Packet Service is provided is determined sector congestion information, and each from one or more sectors is launched this sector congestion information, selects with convenient sector of being undertaken by the mobile radio station of participating in this forward link data Packet Service.Usually, for each sector that Packet data service is provided, at least one in this network-evaluated forward link congestion level value and the reverse link congestion grade point.In this context, " congested " can based in lising under (but being not limited to) any one or a plurality of: forward link power and/or extended code resource are (total, or distribute for this Packet data service), quantity, reverse link loading (for example, heat increases (rise-over-thermal)), the average sector throughput (forward direction and/or reverse link) of this Packet data service, service quality (QoS) constraint of voice and/or packet data user.
[0011] no matter current sector congestion levels value based on particular state how, network can be launched such congestion information to mobile radio station on regular basis, if because the congestion level of a given sector is lower than the congestion threshold of appointment, this emission then do not have congestion information can supply this sector transmission, so may be discontinuous.In exemplary IS-2000 embodiment, provide interested Packet data service by the forward packet data channel (F-PDCH) of launching in the sector, many wireless base stations in network each.Congestion information-for example, sector congestion levels value (or a plurality of value)-can in each sector, be launched by using forward packet data control channel (F-PDCCH).
[0012] in this context, the F-PDCCH that launches in each sector can be modified to: at least when sector congestion levels is higher than given threshold value, with the form carrying sector congestion information of sector load informational message (SLIM), this sector congestion information can be launched on regular basis.This SLIM can carry through one of them or both congestion level value that quantize, that be used for forward link and reverse link congestion grade.According to the definition of available channel, can (for example, realize other scheme in W-CDMA) at other network type.Exemplary F-PDCCH revises and comprises: available (otherwise being exactly untapped) medium access control discre value (that is, unique MAC ID) is used for the emission of SLIM.
[0013] in any case, at mobile radio station, selecting the exemplary method of serving sector for Packet data service in cordless communication network comprises: receive the sector congestion information of the one or more sectors in the candidate service set of sectors of this mobile radio station, and at least in part based on this sector congestion information in this collection sector of selection as serving sector.Receiving sector congestion information can comprise: each from one or more sectors receives the control channel signals of carrying sector congestion information.Like this, each sector can be launched the forward link packet data control channel together with the selectable forward link packet data channel that is used for the forward link packet data business of mobile radio station, and mobile radio station can be monitored control channel in its one or more sectors of selecting will consider in the decision processing, that be used for corresponding sector congestion information.
[0014] in this context, in the candidate sector collection, select a sector can comprise based on sector congestion information at least in part: to select or reselect serving sector the sector in this collection based on sector signal quality measurement and sector congestion levels value as serving sector.More specifically, mobile radio station can be based on the combination of determining that new serving sector has better sector signal quality and sector congestion, and changes to this new serving sector from the current service sector.Should determine can be based on come current signal quality measured, this weighting signal quality measured relatively also with new serving sector of weighting with corresponding sector congestion levels value.For example, mobile radio station can determine whether the difference between the weighted signal quality measurements of current and new serving sector surpasses specified threshold value.
[0015] like this, threshold value can be used to limit " the back and forth conversion " of mobile radio station between the sector by doing following requirement, that is: be under the situation of candidate service sector of " better " in another sector on current service sector next door, unless this another sector better must reach at least the tolerance limit by this threshold value appointment, otherwise mobile radio station will not switch." better " depends on the specific appraisal procedure that realizes in mobile radio station in this context, and the meaning of indication can be: the tolerance that calculates for the sector that is decided to be new serving sector target surpasses the same metric that calculates for the current service sector.An exemplary metric comprises by the sector signal quality divided by the sector congestion levels value to be measured.
[0016] as mentioning previously, this network can be launched forward link and reverse link congestion information.Like this, mobile radio station can also receive the reverse link congestion value of those sectors except the congested value of the forward link that receives one or more sectors.Therefore, the selection tolerance calculated of mobile radio station can be based on the congested value of forward link or reverse link congestion value or based on the two some combination.In addition, can calculate and the forward link of those sectors more under consideration and the not homometric(al) of reverse link.Therefore, the sector of mobile radio station select decision can be congested based on forward link, reverse link congestion or the two some combination.
[0017] in one or more one exemplary embodiment, depend on that the mobile radio station current business is more responsive or more responsive to the reverse link performance constraint to the forward link performance constraint, mobile radio station makes its selection decision based on forward link congestion level value or reverse link congestion grade point.Therefore, need the mobile radio station of good reverse link performance can select to have the new serving sector of low reverse link congestion, even its forward link more congested than current service sector.
[0018] certain, can be as required or expectation and take other selection decision algorithm, and should be understood that the present invention is not limited to above-mentioned feature and advantage.In fact, read the following detailed description and the accompanying drawing of having read after, one of ordinary skill in the art will recognize that additional features and advantage.
The accompanying drawing summary
[0019] Fig. 1 is the schematic diagram of the exemplary wireless communications network of one or more embodiment according to the present invention.
Fig. 2 is the wireless base station of exemplary base station system of one or more embodiment according to the present invention and the schematic diagram of base station controller circuit details.
Fig. 3 is the schematic diagram of demonstration network processing logic that is used for realizing the sector congestion information emission of every sector.
Fig. 4 is the schematic diagram that is used for realizing the exemplary mobile radio station processing logic selected based on congested sector.
Fig. 5 is the schematic diagram of the transmission of congestion information of exemplary every sector.
Fig. 6 is the schematic diagram of mobile radio station circuit details of the exemplary mobile radio station of one or more embodiment according to the present invention.
Fig. 7 is based on the schematic diagram of exemplary processes logic details of the sector selection processing of mobile radio station.
Detailed Description Of The Invention
[0020] the invention provides a kind of with mobile radio station sector selection operation at least in part based on the method and apparatus of sector congestion levels knowledge.Segment map has shown exemplary wireless communications network 10 in Fig. 1.Network 10 for example can comprise based on the IS-2000 standard or based on the cellular communications networks of W-CDMA standard.As illustrated, network 10 comprises wireless access network (RAN) and packet switched core network (PSCN) 18, wherein wireless access network (RAN) comprises wireless base station (RBS) 14 and base station controller (BSC) 16, and packet switched core network (PSCN) 18 is coupled to one or more PDN(Public Data Network)s 20-for example, the Internet with communication mode with network 10.It will be understood to those of skill in the art that network 10 can comprise other entity that for the sake of clarity and not illustrates.
[0021] network 10 provides the wireless coverage that is organized into a plurality of wireless area 12-1,12-2 and 12-3, and each sub-district provides three sector S1, S2 and the S3 of wireless coverage.It is to be noted, discuss for convenience that present disclosure concentrates on " sector " as the wireless coverage fundamental region, but those skilled in the art are to be understood that identical notion can be in every cell level, or the like go up and use.The mobile radio station of operating in network's coverage area 22 usually can be from more than one sector received signal, and the wireless signal that this mobile radio station returns can be received by network 10 in more than one sector usually.
[0022] Fig. 2 illustrates exemplary RBS14, it provide support above-mentioned network implementation sectorization transmit and receive coverage.Illustrated RBS14 comprises: centralized transmitter circuitry 30, centralized receiver circuit 32 (that is wireless transceiver circuitry resource), comprise the forward/reverse link treatment circuit 34 and the BSC interface circuit 40 of Channel Processing circuit 36 and congestion estimation circuits 38 respectively.Illustrated forward/reverse link signal processing circuit can comprise hardware, software or their any combination.In an one exemplary embodiment, one of them a little based on network sector congestion estimates and transmission process is implemented as program command, is used for being carried out by one or more microprocessors of realizing in RBS14 or other logic processing circuit.
[0023] like this, each RBS14 can be configured to carry out the congested processing of ongoing every sector, with the congestion level (or a plurality of grade) of estimating each radio sector, and each RBS14 can be further configured and is the such information of emission on the basis of each sector.Yet some or all can carry out certain in this processing on the BSC-level.Therefore, Fig. 2 further illustrates exemplary BSC16, and it comprises supports circuit unit of the present invention.More specifically, BSC16 comprises processing and control circuit 42, and processing and control circuit 42 comprise Channel Processing circuit 44 and congestion estimation circuits 46 respectively.Congestion estimation circuits 46 can be embodied as hardware, software or their some combination, and can be configured to the congestion level of estimating each sector and initiate RBS14 to this information emission.It should be understood that can be depending on and on the RBS level, will realize how many congestion estimation processing, revise or omit these circuit units.
[0024] rotate back into the RBS details of Fig. 2, we see RBS14 on the forward link from a sector (that is current service sector) to mobile radio station 22 emission High Rate Packet Data-but receive rl transmission in a plurality of sectors from mobile radio station 22.In enforcement based on IS-2000, RBS14 launches forward link packet data to mobile radio station on F-PDCH, the control information of being correlated with in the F-PDCCH emission simultaneously from " service " sector, and receiving mobiles on the R-PDCH of mobile radio station, on the R-PDCCH of a plurality of sectors at mobile radio station, receiving relevant control signaling.
[0025] though the present invention allows mobile radio station 22 freely go to select the F-PDCH serving sector based on the autonomous processing of this mobile radio station usually, network is handled by provide the congestion information of one or more sectors to influence this decision for mobile radio station 22.In an one exemplary embodiment, upward provide service for this mobile radio station at F-PDCH from any one sector in current " effectively " set of sectors that is assigned of mobile radio station 22.Though the active set of being carried out by network 10 is assigned and be can be depending on the wireless standard that network 10 comprises and change, such active set normally can be with the signal strength signal intensity that is equal to or higher than appointment to RBS sector that mobile radio station 22 is launched based on identification.
[0026] in any case, suppose given mobile radio station 22 by being used to mobile radio station 22 to provide a sector in the candidate sector collection of service that service is provided, Fig. 3 briefly illustrates according to demonstration network of the present invention and handles.According to illustrated processing logic, network 10 is determined the congestion information (forward link and/or reverse link congestion are estimated) (step 100) of each sector, and in its one or more sectors the such information of emission, so that use, and/or be used for one or more being thought of as of those sectors is used for the candidate sector (step 102) that serving sector is selected by the mobile radio station of in those sectors, operating 22.
[0027] Fig. 4 briefly illustrates additional exemplary mobile radio station processing, and wherein mobile radio station 22 receives the sector congestion information (step 104) as one or more sectors in the network sector of the candidate sector that service is provided for mobile radio station 22.Mobile radio station 22 can receive the information of all candidate sector (for example all sectors in its active set), perhaps receives information from the sector of lacking than all this sectors.Under any circumstance, mobile radio station 22 selects decision at least in part based on sector congestion information by the sector that makes it, thereby sector congestion information is incorporated in its sector selection processing (step 106).Example as indefiniteness, mobile radio station 2 can be selected new serving sector in response to the indication that receives the current service sector congestion, if perhaps target sector is congested or more congested than current service sector at least, then it can avoid the selection of new serving sector.
[0028] Fig. 5 illustrates the exemplary basis that is used for to mobile radio station 22 reception and registration load (congested) information.In IS-2000 embodiment, each sector of RBS14 is launched its load information independently by the F-PDCCH that is just launching in this sector.This load information can be used as in F-PDCCH is assigning the sector load informational message (SLIM) that repeats on the time slot to be carried, and like this, SLIM is broadcast to all users in this sector.(here, just those mobile radio stations 22 serviced or that just expectation is served on it on the F-PDCCH of this sector represented in term " user ".)
[0029] SLIM can be configured in forward link (FL) and reverse link (RL) load beared informations, and can be launched in synchronization slot, so that each sector provides SLIM information in equal mode.It is to be noted, can dispose by layer 3 (L3) signaling from the SLIM of different sector transmission, and it is to be noted, can stride the sector and use identical F-PDCCH time slot, perhaps can use cross time-slot.Striding the sector use to intersect message and regularly can reduce given mobile radio station and obtaining SLIM on the F-PDCCH of a sector, obtaining same corresponding congested the measurement the needed time of SLIM at interval on the F-PDCCH in another sector then.
[0030] therefore, as shown in Figure 5, each RBS14 is configured to launch SLIM by using on the SLIM time slot/F-PDCCH of cycle timing in each RBS sector, and can stride the sector and use identical or different time slot/cycle regularly.In addition, RBS14 can be configured to not consume the time that sends SLIM on the F-PDCCH of given sector, unless the congestion level of this sector (or a plurality of grade) has has met or exceeded the congestion threshold of one or more appointments.In other words, unless that RBS14 can be configured to sector congestion is determined high as one or more measuring basis, otherwise do not send congestion information.Make in this way, on the F-PDCCH of given sector, lack SLIM and just impliedly indicate low congestion level in this sector.
[0031] in more detail, in the context of an embodiment, mobile radio station 22 is configured to come the handed over service sector based on the signal quality of measuring the sector in its active set and based on the load information of those sectors that receive.Typically, this needs mobile radio station 22 to obtain the congestion information of the congestion information of current service sector and next at least " the best " sector, next " the best " sector is counted as the candidate sector (candidate sector of the highest year (C/I) ratio of making an uproar for example, is provided) that optimum signal quality is measured that has except serving sector on mobile radio station 22.In order to obtain such congestion information from a plurality of sectors, mobile radio station can realize more than a radio frequency (RF) receiver chain-for example, it can realize being used for from two or more sectors each receive the reception chain of F-PDCCH signal.Return consideration Fig. 5, we see then can side by side obtain this information if all sectors are launched congestion information simultaneously.Certainly, identical RF receives chain and can be used to obtain congestion information from the F-PDCCH of a sector, continue then to be reconfigured for the F-PDCCH of one or more other sectors of decoding-whenever next.
[0032] if even RBS14 is configured to when also launch SLIM on the F-PDCCH in each sector in an individual sector during just slight the loading always, then mobile radio station 22 can use this information, the congestion information by each sector in its active set that utilizes the signal quality measured and reception to carry out the sector and select on continuous basis.From the viewpoint of network, it is " load balancing " that mobile radio station is carried out the general effect of selecting based on congested sector.That is to say that the sector that is incorporated into mobile radio station 22 by the sector congestion with relative grade is selected in the logic, general effect be mobile radio station 22 when the selection decision of making them, prefer selecting congested lighter sector compared with congested heavier sector.Like this, network 10 is pushed the user of its high speed data transmission service to its congested lighter sector indirectly, and can not disturb those users' autonomous sector selection operation.
[0033] yet, as noted above, RBS14 launches SLIM always in given sector, but can be configured to like this: whether the processing logic of controlling the emission in each sector has become congested based on definite this sector and has determined whether independently to launch SLIM on this F-PDCCH.If sector congestion is then launched SLIM on the F-PDCCH of this sector, still,, then do not launch SLIM, thereby make all available F-PDCCH time can be used for Packet data service control if the sector is not congested.Like this, suppose the sector signal quality that offers the best, so current this not on the F-PDCH of the sector of emission SLIM on relevant F-PDCCH serviced mobile radio station 22 can rest on the there.Yet in case this sector begins to launch SLIM, mobile radio station 22 will obtain congestion information from one or more other candidate sector, whether should select new serving sector to determine it.It is to be noted that mobile radio station 22 can be configured to: select in its sector for any sector that does not receive its present load information, to use the congestion level value (or default value) of acquiescence in the decision processing.
No matter on F-PDCCH, receive, still be to obtain according to default value, such load information can be expressed the grade of sector congestion levels according to various forms, and can be based on a plurality of and congested relevant variable or the combination of variable.For example, the exemplary SLIM on F-PDCCH launches the SLIM that can be identified as based on distinctive MAC ID value or some other SLIM identifier.For example, equal ' 00000001 ' MAC-ID if F-PDCCH0 message comprises, then this indicates this F-PDCCH0 message to comprise SLIM, and does not comprise the forward packet data channel assignment to specific mobile radio station.In this message remaining bit will comprise with this sector in forward direction and/or the corresponding bitmap of reverse link loading grade.All receive the mobile radio station of this message can preserve this bitmap, switches decision to be used for later sector.Each base station uses such message that the current sector load information of forward link and/or reverse link is provided as mobile radio station.
[0034] like this, each SLIM can carry one of them or both of forward link and reverse link congestion grade point, and those values can form many bit congestion level (or amplitude) designator.As the example of indefiniteness, the forward link sector congestion grade point in each SLIM can be represented that reverse link congestion can be represented by m bit value (for example, 5 bits) by n bit value (for example, 8 bits).Depend on the definition of wanting that is used to transmit sector congestion levels, can use still less or the bit of greater number.In addition, can be defined the congestion parameter that is used for transmitting more than for the sub-bit groupings in the bit of forward link or the distribution of reverse link congestion grade point.
[0035] congestion parameter of describing in SLIM (or a plurality of parameter) can include, but are not limited to: the number of users of sharing voice in the number of users of Packet Data Channel and/or the sector or dedicated channel in the sector, can be in the sector for the emission power of forward link amount of shared channel use, the quantity of whole available extended code resources maybe can be for the quantity of the extended code resource of shared channel use, the average summation of the sector throughput of forward link and/or reverse link, be present in the qos constraint in the sector, the heat (noise) of the reverse link receiver of sector increases to be estimated or the like.Certainly, can use a plurality of additional or alternative measurements that transmit the sector load state by any way, estimate or the like.
[0036] common, the load information that is transmitted by SLIM will provide so a kind of basis for mobile radio station 22, be used for promptly determining under the situation of the relative signal mass measurement of having considered each sector whether a given sector provides and the identical or better Packet data service of the serving sector of current selection.Thereby, should be understood that the present invention is not limited to estimation or the measurement of any specific congestion parameter that carries out in order to generate the sector congestion information that will launch on RBS14 (or BSC16).
[0037] aspect the providing of the emission of sector congestion information, to comprise following by one group of exemplary parameter that RBS14 is communicated to mobile radio station 22: (1) LOAD_REPORTING_MODE (load report pattern)-appointment BS be to the operator scheme of mobile radio station report sector grade load information, and comprises value (A) NONE (nothing), (B) CONGESTION_BASED (based on congested), (C) ALWAYS_ON (always opening); (2) SLIM_SLOT_LENGTH (SLIM slot length)-when with the pattern (B) of item (1) and (C) when operation, be designated as 4 bit fields, and provide the length (it is to be noted, carry SLIM in 1.25 milliseconds of time slots of first in this appointed interval) of 20 milliseconds of units; (3) SLIM_CYCLE_LENGTH (SLIM Cycle Length)-when with the pattern (B) of item (1) and (C) when operation, be designated as 8 bit fields, and for some integer value N, it satisfies equation: SLIM slot length * SLIM Cycle Length * N=1.28 second; (4) CDM congestion parameter-comprise value (A) C/I_REPORTING_THRESHOLD (C/I reports threshold value)-designated when operating with the CDM pattern, provide and be higher than it and then require travelling carriage to remain in the current serving sector to be used for the C/I value of possible scheduling, and (B) C/I_REPORTING_DISTANCE (C/I reported distance)-4 bit fields, appointment is a unit with 1.25 milliseconds of time slots, the time slot that sends the C/I report from mobile radio station is used to carry out the distance of the time slot of comparison by base station and mobile radio station to this C/I report, it is to be noted, defined as the IS-2000 standard, but using system parameter message/Extended Channel Assignment Message is transmitted into mobile radio station 22 with above-mentioned all parameters.The message that extra or alternative being used to transmits this information comprises: universal handoff direction message (UHDN), professional connection message (SCM) and operation system intrinsic parameter message (ITSPM).Other network standard provides the similar mechanism that is used for transmitting to mobile radio station this information.
[0038] be used for before handling the exemplary method of emission information on the mobile radio station at detailed description, Fig. 6 illustrates the exemplary mobile radio station 22 of one or more embodiment according to the present invention.Illustrated mobile radio station comprises: antenna assembly 30, RF receiver circuit 32 separately and transmitter circuitry 34, baseband processing circuitry (or a plurality of circuit) 36, system controller 42 and user interface 44, wherein base band signal process circuit 36 comprises sector selection processing circuit 38 and estimation circuit 40, or is associated with these two circuit.What it will be understood to those of skill in the art that is, mobile radio station 22 can comprise cellular radio, radio pager, portable digital-assistant, have the portable communication device of the kneetop computer/palmtop computer of wireless communication ability or any other type in essence, and the specific circuit arrangement of mobile radio station 22 and feature will depend on its specific purposes or purpose.
[0039] in addition, one skilled in the art will appreciate that illustrated circuit can comprise hardware, software or their combination in any.For example, selecting treatment circuit 38 can be independent hardware circuit, perhaps can be used as the part of other processing hardware and is included in.Yet, more advantageously be, instruct by program stored at least in part and realize this selection treatment circuit, wherein, carry out this program command by one or more microprocessors, digital signal processor (DSP) or other digital processing circuits of being included in the mobile radio station 22.
[0040] under any circumstance, Fig. 7 illustrates an embodiment of the sector selection processing on mobile radio station 22, and wherein processing starts from mobile radio station 22 provides the one or more sectors in the candidate sector collection of service to carry out signal quality measured (step 110) for those at (or on some high speed data channels at other) on the F-PDCH for it.In an one exemplary embodiment, this operation comprises the C/I ratio of the active set pilot tone that estimation is being launched by the sectorization RBS transmitter in one or more RBS14.Should be understood that, if desired, can on ongoing basis, make such measurement according to the timetable of appointment or according to other some algorithms.
[0041] signal quality measured available in this wise owing to what upgraded, the signal quality (step 112) that compares and measures of mobile radio station 22 then, and determine that whether any sector in this collection has better signal quality (step 114) than the current selection of this mobile radio station as the sector of serving sector.If mobile radio station 22 is assessed current serving sector and destination service sector-promptly, have another sector (step 116) of higher signal quality based on the signal quality of two sectors and sector congestion levels.The sector will be better service sector (step 118) if this evaluation form makes eye bright mark, and then mobile radio station 22 is selected the new serving sector of this target sector as it, and change to this target sector (step 120) according to the gravity treatment rules of appointment.As previous explanation here, IS-2000 provides a kind of mobile radio station 22 that is used for to use the CQI that has encoded to report the mechanism that changes to network 10 signaling sectors.
[0042] in above-mentioned processing, mobile radio station 22 can be configured to carry out a kind of appraisal procedure, and this appraisal procedure uses each sector signal quality to measure and some of each congestion level value makes up to determine whether another sector in the available candidate sector will provide than current selected serving sector better service.For example, even if the current service sector has the highest signal quality, it still may not provide as the good data rate of another candidate sector, and wherein this another candidate sector has low slightly signal quality, but congested lighter.Like this, for suitable haply signal quality, relative congestion level can determine which sector is actually the better selection as the serving sector of mobile radio station.
[0043] particularly, in a kind of exemplary sector system of selection, mobile radio station 22 forms weighted signal quality measurements, wherein, it comes the signal quality measured of this sector of weighting according to the congestion information of current service sector, and come the signal quality measured of at least one target sector of weighting according to the congestion information of target sector, wherein this at least one target sector is the candidate sector that is used to select as new serving sector.Mobile radio station 22 determines whether to change the sector by the measurement of relatively this weighting then.This relatively can be simple, wherein, use " greater than " test.That is to say that if the weighted measurement of target sector surpasses the weighted measurement of current service sector, then mobile radio station 22 changes to target sector-promptly, it is selecting the new serving sector of this target sector as it signaling network 10.
[0044] yet, it is more complicated that this selection is handled.For example, by at least certain some participate in high speed packet data services mobile radio station 22 move to congested lighter sector, come the pay(useful) load equilibrium of convenient network 10, but not that all such mobile radio stations 22 in given sector all must be selected new serving sector in response to this sector is just becoming congested, because can not make full use of this sector like that.Therefore, mobile radio station 22 can be configured to change the sector according to the probable value of appointment.According to this method, mobile radio station 22 will be determined available better sector according to relative congestion level, but will change to this sector according to the probable value of appointment.
[0045] in the process of this method of implementation, network 10 can be launched one or more probable values to mobile radio station, being used for sector selection processing, and can be depending on the signal quality of those just evaluated sectors and the relative mistake between the congestion level and use different probable values.Like this, if another sector is more much better than current serving sector, be that a little better situation is compared then with this another sector, mobile radio station 22 will change the sector with higher probability.
[0046], also can limit sector selection processing by using simple threshold value even mobile radio station 22 does not use the conversion based on probability.For example, for the mobile radio station 22 employed any tolerance in sectors-for example relatively, above-described weighted signal quality-it can calculate the difference between the tolerance of the tolerance of current service sector and target sector, and this difference is compared with specified threshold value.If this difference surpasses threshold value, then mobile radio station 22 will be selected the new serving sector of this target sector as it.Significantly, adjust or additionally be provided with threshold value and determined that mobile radio station 22 has many sector reselection of carrying out energetically.
[0047] in more detail, allow α
0Forward link (FL) load on the current service sector of expression mobile radio station 22, and allow α
The FL load of all other base station sections in the expression mobile radio station active set.If do not report the α of certain base station sector
, then mobile radio station adopts some configurable default value that give it or that can receive from network 10.Allow the C/I of FL of this serving sector of Г 0 expression, and allow Г
The C/I that represents the FL of other base station section in this mobile radio station active set.In addition, supposing provides reverse link (RL) load information, allows β
0The RL load of serving sector of expression mobile radio station 22, and allow β
Represent the RL load of all other base station sections in this mobile radio station active set.If do not report the β of certain base station sector
, then mobile radio station 22 adopts some default value.
[0048] basis of selecting as its serving sector, mobile radio station 22 is determined at its Г
/ β
Its Г under the value acceptable terms
/ α
Than maximum base station section (" Г
/ β
Value can be accepted " qualification avoided the RL load too heavy or RL load and FL load differ the too sector of great disparity).If Г
/ α
Than Г 0
/α
0Go out the amount ε of at least some regulations greatly
FLIf, and Г
/ β
Compare Г
0/ β
0Go out the amount ε of at least some regulations greatly
RL, then the C/I-in another sector right-the congested and C/I-of FL is right-the congested ratio of RL is more favourable, and mobile radio station 22 switches to this another sector.Usually, ε
FLWill be on the occasion of, and ε
RLCan adopt on the occasion of or negative value.For reverse link, allow the meaning of negative value to be: permit mobile radio station switch to C/I-right-the RL congestion level value is than its worse sector, current service sector.Like this, in this case switching decision be partial to seek C/I-right-the FL congestion level value is than better sector, current service sector.
[0049] certain, the present invention plans to change this logic, so that also permit negative value for forward link, that is, and ε
FLCan bear.In fact, it is more important and dynamically change its assessment algorithm that mobile radio station 22 can be depending on after given its requirement of the current data business more important still reverse link performance of forward link performance.For example, the data service of some types has been settled the QoS constraint stricter than FL to RL, and perhaps vice versa.Under first kind of situation, mobile radio station 22 can make its sector select to be partial to seek best RL state in the candidate sector collection, and under second kind of situation, it can be partial to its sector selection processing seek best FL state.
[0050] certain, many chances can be used for repairing the present invention, so that handle the balance that finds an expectation between complexity and the operation overhead in the selection that increases, for example, mobile radio station 22 can be configured to: if the C/I of its current service sector is than being higher than specified threshold value then do not use based on congested selection and handle.In addition, mobile radio station 22 can be configured to: be only limited to receive current selected serving sector and next best (C/I than aspect) congestion information of service candidate sector.Therefore, need the F-PDCCH of mobile radio station 22 " tuning ", monitor the F-PDCCH of all sectors in its active set and need not spend the extra time to an additional sectors.
[0051] no matter these extra selections handles what kind of enhancing is, basic point is network 10 provides each sector for mobile radio station 22 a congestion information, these congestion informations are incorporated in the sector selection processing logic of mobile radio station, and therefore can influence the sector selection of mobile radio station 22 as the function of sector congestion levels.In addition, the present invention can make network in temporary transient a period of time given sector be removed from the selection of mobile radio station 22 is considered.Like this, network 10 sends message to mobile radio station, indication should be got rid of the one or more sectors in its active set sector in the temporary transient period from sector selection processing, rather than is forced to remove given sector avoids mobile radio station 22 to select these sectors to be used for the possibility of Packet data service in the active set of mobile radio station.
[0052] for example just congested serious sector moves to a new sector and this network and wants temporarily will remove (promptly from consider at preceding serving sector from one at mobile radio station 22, want to postpone any mobile radio station and switch back serving sector the preceding) situation under, this method is useful.In addition, it provides a kind of mechanism, and by this mechanism, network 10 can be assigned as given sector the sector of mobile radio station 22 temporary transient " no admittance ", otherwise, will be thought of as the candidate sector that is used for the expection selected the sector to this sector.This message can be carried the length of delay of a quantification, and how long it should get rid of this given sector this value from select consideration to mobile radio station 22 indications.Advantageously, this message can be defined to such an extent that can use zero delay value (or other some characteristic values) to indicate mobile radio station 22 indicated sector forever should be removed from select consideration.Certainly, sometime after a while, can indicated sector be returned in the active set of mobile radio station by suitable L3 signaling.
[0053] in fact, above-mentioned method is equal to uses configurable timer, and by this timer, a given sector was considered to be removed in the used collection from carrying out serving sector for mobile radio station 22 before this timer expiration.Replacedly, or additionally, similar timing mechanism can be used to control mobile radio station 22 to carry out new serving sector and selects the frequency handled after changing the sector, to limit for example reciprocal conversion between the sector.
[0054] in a word, illustrated as top one exemplary embodiment, the present invention includes and a kind ofly can under the situation of considering relative sector signal quality and congestion level, select be used for this professional best sector, thereby the method and apparatus of continuous load equilibrium is provided in cordless communication network by the mobile radio station that makes the expectation high-speed packet data service.By the autonomous sector selection of mobile radio station is handled the function that changes to a kind of every sector congestion levels, network has alleviated otherwise may become the congestion problems of big localization.In addition, should be understood that the present invention is not subjected to the restriction of aforementioned discussion, but be subjected to the restriction of following claim and their lawful equivalent.
Claims (46)
1. method of selecting to be used for the serving sector of Packet data service in cordless communication network on mobile radio station comprises:
Be received in sector congestion information as the one or more sectors in this mobile radio station serving sector candidate's the set of sectors; With
In this collection, select a sector based on described sector congestion information at least in part as serving sector.
2. the process of claim 1 wherein that the sector congestion information that receives the one or more sectors in the set of sectors comprises: each sector from one or more sectors receives the control channel signals of carrying sector congestion information.
3. the method for claim 1, each sector transmission forward link packet data control channel in wherein should collection, and the sector congestion information that wherein receives a given sector in the sector in this collection comprises by forward link packet data control channel reception sector congestion information.
4. the method for claim 1, wherein select in this collection a sector to comprise based on sector congestion information at least in part: to measure and comprise the sector congestion levels value of sector congestion information based on sector signal quality, select or the gravity treatment serving sector among the sector in this collection as serving sector.
5. the method for claim 1, wherein select a sector to comprise as serving sector based on sector congestion information in this collection at least in part: the combination based on determining that new serving sector has better sector signal quality and sector congestion levels changes to new serving sector from the current service sector.
6. the method for claim 1, wherein select in this collection a sector to comprise as serving sector based on sector congestion information at least in part: signal quality measured, this weighting signal quality measured relatively also based on come weighting current service sector and new serving sector with corresponding sector congestion levels value optionally change to new serving sector from the current service sector.
7. the method for claim 6, wherein relatively the signal quality measured of this weighting comprises: determine whether the difference between the weighted signal quality measurements of current service sector and new serving sector has surpassed the threshold value of definition.
8. the method for claim 7 wherein optionally changes to new serving sector from the current service sector and comprises: if this difference surpasses the threshold value of this definition, then changes to new serving sector.
9. the method for claim 7 wherein optionally changes to new serving sector from the current service sector and comprises: if this difference surpasses the threshold value of this definition, then the probable value according to one or more definition changes to new serving sector.
10. the method for claim 9 further comprises: probability of acceptance information from the network of the probable value of determining described one or more definition.
11. a mobile radio station comprises:
The RF signal receiving and s ending machine circuit is configured to send signal to cordless communication network, and from this cordless communication network received signal; With
One or more processor circuits that in operation, are associated with this RF signal receiving and s ending machine circuit, and it is configured to: based on receive the sector congestion information of one or more sectors of set of sectors that is used in the network as the candidate of service is provided for this mobile radio station on forward link packet data channel, select serving sector among this collection at least in part.
12. the mobile radio station of claim 11 further comprises: in response to receiving the message of a sign, and at least temporarily this designated sector is got rid of from select to consider as a designated sector in the sector in mobile radio station serving sector candidate's the set of sectors.
13. the mobile radio station of claim 12 further comprises: the time that removes this designated sector from select consideration is set based on the value that receives in this message.
14. the mobile radio station of claim 11, wherein this mobile radio station is configured to: select serving sector by sector congestion information and the sector signal quality of assessing the two or more sectors in this collection comparatively.
15. the mobile radio station of claim 11, wherein this mobile radio station is configured to: in response to the combination of determining signal quality in the new serving sector and sector congestion more favourable than in the current service sector, and change to this new serving sector from the current service sector.
16. the mobile radio station of claim 11, wherein this mobile radio station is configured to: in response to the combination of determining signal quality in the new serving sector and sector congestion more favourable than in the current service sector, and change to this new serving sector from the current service sector according to the probable value of definition.
17. the mobile radio station of claim 16, wherein this mobile radio station is configured to: based on the probable value that definition is set from network probability of acceptance information.
18. the mobile radio station of claim 11, wherein this mobile radio station is configured to: in response to determine new serving sector based on more favourable than current service sector of the tolerance of signal quality and sector congestion, and change to this new serving sector from the current service sector.
19. the mobile radio station of claim 11, wherein this mobile radio station is configured to: in response to receiving the message of a sign as a designated sector in the sector in mobile radio station serving sector candidate's the set of sectors, and at least temporarily this designated sector is got rid of from select to consider.
20. the mobile radio station of claim 19, wherein this mobile radio station is configured to: the time that removes this designated sector from select consideration is set based on the value that receives in this message.
21. a mobile radio station is selected the method for serving sector, comprising:
On mobile radio station from receive the forward packet data business as the current service sector in serving sector candidate's the set of sectors;
Receive the sector congestion information of the one or more sectors in this collection;
Calculate the signal quality measured of the interior one or more sectors of this collection; With
Should be signal quality measured determine whether to change to new serving sector based on assessment from the current service sector with sector congestion information.
22. the method for claim 21, wherein this signal quality measuredly determines whether that with sector congestion information changing to new serving sector from the current service sector comprises based on assessment: determine that another sector has and compare substantially the same or better signal quality with the current service sector, and lighter than current service sector congestion.
23. the method for claim 21, wherein should be signal quality measured determine whether that with sector congestion information changing to new serving sector from the current service sector comprises: determine that another sector has than current service sector better signal quality, but it is too congested so that can not the new serving sector of selected conduct based on assessment.
24. the method for claim 21, wherein should be signal quality measured based on assessment and sector congestion information determine whether that changing to new serving sector from the current service sector comprises: come weighting current service sector with corresponding sector congestion levels value with this collection in another sector signal quality measured at least, and signal quality measured conduct another sector of serving sector newly that optionally changes to of this weighting based on the comparison.
25. the method for claim 24, wherein signal quality measured another sector that optionally changes to as new serving sector of weighting comprises based on the comparison: if the weighted signal quality measurements of this another sector then changes to described another sector than the tolerance limit of what a definition of weighted signal quality measurements of current service sector.
26. the method for claim 24, wherein signal quality measured another sector that optionally changes to as new serving sector of weighting comprises based on the comparison: if the weighted signal quality measurements of this another serving sector is better than the weighted signal quality measurements of current service sector, then the probable value according to definition changes to described another sector.
27. the method for claim 26 further comprises: probability of acceptance information is provided with the probable value of this definition on mobile radio station.
28. the method that the sector congestion information of sector is provided for mobile radio station in cordless communication network comprises:
Determining can be by each sector congestion information in the autonomous one or more sectors that the forward link packet data business is provided selected of mobile radio station; With
Launch in described one or more sector the sector congestion information of each, select with convenient sector of being undertaken by the mobile radio station of participating in the forward link packet data business.
29. the method for claim 28, wherein determine and to comprise by the sector congestion information of each in the autonomous one or more sectors that the forward link packet data business is provided selected of mobile radio station: in each sector, estimate at least one in forward link congestion level value and the reverse link congestion grade point.
30. the method for claim 29 wherein, for each sector, estimates that the forward link congestion level value comprises: the Resource Availability of estimating forward link packet data business in this sector.
31. the method for claim 29 wherein, for each sector, estimates that the forward link congestion level value comprises: determine current quantity of participating in the mobile radio station of forward link packet data business in this sector.
32. the method for claim 29, wherein, for each sector, estimate that the forward link congestion level value comprises: based on determining one of at least the forward link load value in lising down, promptly in the quantity of the mobile radio station that just is being supported in this sector, this sector the average forward link sector throughput of the availability of transmitter power or coding resource, this forward link packet data business and with the current quality of service requirement that one or more mobile radio stations of participation forward link packet data business are associated in this sector.
33. the method for claim 29 wherein, for each sector, estimates that the reverse link congestion grade point comprises: determine the reverse link loading value based on the heat added value of estimating the base station receiver in this sector.
34. the method for claim 28, wherein, for each sector, the emission sector congestion information comprises: periodically launching sector congestion information for supporting on the professional control channel signals of launching of forward link packet data.
35. the method for claim 28, wherein, for each sector, the emission sector congestion information comprises: determine whether the current congestion state of this sector surpasses the congestion threshold of definition, if and surpassed the congestion threshold that defines, would then periodically launch sector congestion information on the professional control channel signals of launching of forward link packet data for supporting.
36. the method for claim 28, wherein the forward link packet data channel signal shared based on emission of each sector provides the forward link packet data business, and wherein launches sector congestion information and be included on sharing the forward link packet data control channel signals that the forward link packet data channel signal launches and launch sector congestion information.
37. the method for claim 28 further comprises: to specific mobile radio station emission message, it should be at least temporarily gets rid of this message indication the sector of an appointment from the candidate's that selects as the serving sector of this mobile radio station consideration.
38. a fan zoning base station system comprises:
One or more congestion estimation circuits are configured to estimate the sector congestion information of each sector in this base station system, and described sector congestion information comprises forward link sector congestion information at least; With
One or more transmitter circuitrys are configured to the described sector congestion information of emission in the respective sectors of this base station system.
39. the base station system of claim 38, wherein this base station system comprises a wireless base station, and wherein said one or more congestion estimation circuits and described one or more transmitter circuitry comprise the wireless base station circuit.
40. the base station system of claim 38, wherein this base station system comprises a base station controller and a wireless base station, and wherein said one or more congestion estimation circuits comprises the base station controller circuit, and described one or more transmitter circuitrys comprise the wireless base station circuit.
41. the base station system of claim 38, wherein this base station system is configured to: forward link packet data channel signal that emission is shared in each sector of this base station system and the forward link packet data control channel signals that is associated, and further be configured to: provide sector congestion information on the forward link packet data control channel signals of in each sector, launching.
42. the base station system of claim 41, wherein this base station system is configured to: periodic emission sector congestion information in each sector.
43. the base station system of claim 41, wherein this base station system is configured to: surpass in the sector of one or more definition threshold values in each wherein one or more congested tolerance, launch sector congestion information on the basis of each sector.
44. the base station system of claim 41, wherein this base station system is configured to: use forward packet data channel (F-PDCH) that Packet data service is provided, and be configured to: provide sector congestion information by corresponding forward packet data control channel (F-PDCCH).
45. the base station system of claim 38, wherein this base station system is configured to: to specific mobile radio station emission message, it should be at least temporarily gets rid of this message indication the sector of an appointment from the candidate's that selects as the mobile radio station serving sector consideration.
46. the method that the autonomous serving sector that an influence is made by mobile radio station is selected, this method comprises that to mobile radio station emission message this message indication should at least temporarily be got rid of a sector that is identified from the consideration of this mobile radio station in the candidate's who is considered as this mobile radio station serving sector selection set of sectors.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50741703P | 2003-09-30 | 2003-09-30 | |
| US60/507,417 | 2003-09-30 | ||
| US60/527,846 | 2003-12-08 | ||
| US60/530,859 | 2003-12-17 | ||
| US10/954,515 | 2004-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1860740A true CN1860740A (en) | 2006-11-08 |
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ID=37298775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004800282375A Pending CN1860740A (en) | 2003-09-30 | 2004-09-30 | Method and apparatus for congestion control in high speed wireless packet data networks |
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|---|---|
| CN (1) | CN1860740A (en) |
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