CN100446626C - Method for determining service cell of high-speed uplink packet access technique - Google Patents
Method for determining service cell of high-speed uplink packet access technique Download PDFInfo
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- CN100446626C CN100446626C CNB200610067432XA CN200610067432A CN100446626C CN 100446626 C CN100446626 C CN 100446626C CN B200610067432X A CNB200610067432X A CN B200610067432XA CN 200610067432 A CN200610067432 A CN 200610067432A CN 100446626 C CN100446626 C CN 100446626C
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Abstract
The present invention relates to a method for determining service cells of a high-speed uplink packet access technique and comprises the following steps: a radio network controller (RNC) determines an unlink optimal cell of a terminal which utilizes a high-speed uplink packet access (HSUPA); when the terminal needs to be carried to an E-DCH channel, the RNC determines an E-DCH service cell at least according to the uplink optimal cell; the optimal cell of the terminal determined is determined according to the quality of a corresponding uplink; the quality of the uplink is the percentage of right packets calculated in a preset period in total receiving packets or the percentage of right packets reaching a preset packet number in the total receiving packets. The proposal of the present invention ensures that the E-DCH is carried by the uplink optimal cell all the time and increases user throughput; the present invention also avoids frequent update problems resulting from an evaluation process of the uplink optimal cell.
Description
Technical field
The present invention relates to a kind of Serving cell and determine method, the Serving cell that relates in particular to a kind of high-speed uplink packet access technique is determined method.
Background technology
It is that 3GPP (third generation partner program) is organized in a kind of new technology that improves up transfer rate of introducing in the R6 agreement that high speed uplink packet inserts (HSUPA) technology, adopted three kinds of major techniques: mix retransmitting and the short frame transmission technology of 2msTTI based on up fast dispatch, the physical layer of NodeB (base station), HSUPA is optimization and the evolution of uplink direction (direction from the portable terminal to the Radio Access Network) at Packet Service.Utilize the HSUPA technology, user's up throughput has obtained great raising, makes the WCDMA of the throughput ratio R99 of cell uplink have more 20-50%, supports peak-peak speed 5.76Mbps in theory, and the system uplink capacity has also obtained very big lifting.Its objective is the up average throughput and the capacity that improve single user and system, so that better carry out multimedia service and bag transfer of data.Below above-mentioned three kinds of major techniques are compared detailed introduction:
Physical layer is mixed re-transmission (HARQ): the HARQ agreement is the improvement to the ARQ agreement, is combined by error correction symbol and ARQ mode.In WCDMAR99, it is to be retransmitted by the RLC under RNC (radio network controller) control to finish that packet retransmits.Under the AM pattern, the re-transmission of RLC (control sub layer of wireless link) is owing to relate to the RLC signaling and the Iub interface transmission, and back off time surpasses 100ms.In HSUPA, defined a kind of packet retransmission mechanism of physical layer, the re-transmission of packet is directly carried out between portable terminal and base station, the base station can send the ACK/NACK signaling to portable terminal by air interface after receiving the packet that portable terminal sends, if the packet that receives correctly then send ack signal, if the packet error that receives just sends the NACK signal, portable terminal can resend the packet of error of transmission rapidly by the indication of ACK/NACK.Owing to got around the Iub interface transmission, under 10msTTI, back off time shortens to 40ms.Physical layer at HSUPA is mixed in the retransmission mechanism, has also used soft merging (soft combing) and incremental redundancy technology (Incremental Redundancy), has improved the transmission accuracy of retransmission data packet may.
Fast dispatch (NodeB Scheduling) based on Node B: in WCDMA R99, the scheduling of portable terminal transmission rate is controlled by RNC, portable terminal can with maximum transmission rate determine by RNC that when DCH sets up RNC can not change the transmission rate of control portable terminal flexibly according to the channel conditions of cell load and portable terminal.Core concept based on the fast dispatch of Node B is to be controlled the transmitted data rates and the transmission time of portable terminal by the base station.The base station is according to the loading condition of sub-district, and user's the channel quality and the data status of required transmission decide the current available maximum transmission rate of portable terminal.When portable terminal wished to use higher data rate to send, portable terminal sent request signal to the base station, and whether the base station agrees mobile terminal request according to the loading condition and the scheduling strategy decision of sub-district.If the request of portable terminal is agreed in the base station, the base station will send the highest available transmission rate that signaling improves portable terminal.When portable terminal does not have data to send in a period of time, the base station will reduce the highest available transmission rate of portable terminal automatically.Because these dispatchs are directly transmission between base station and portable terminal, so the fast dispatch mechanism based on Node B can make the base station control the transmission rate of each portable terminal in the sub-district flexibly apace, make wireless network resource more effectively serve the user of access bursts data, thereby reach the effect that increases cell throughout.
The Transmission Time Interval (TTI) of 2msTTI and the up DCH of 10ms TTI:WCDMA R99 is 10ms, 20ms, 40ms, 80ms.In HSUPA, adopted 10msTTI to reduce transmission delay.Though HSUPA has also introduced the transmission means of 2ms TTI, further reduces transmission delay, the short frame transmission that is based on 2msTTI is not suitable for working in the edge of sub-district.HSUPA and HSDPA are the optimization of WCDMA system at Packet Service, HSUPA has adopted some and HSDPA similar techniques, but the HSUPA simple up reprint that is not HSDPA, the technology of using among the HSUPA has been considered the characteristics of up link self, as up soft handover, power control, and PAR (peak-to-average force ratio) problem of UE (subscriber equipment), AMC technology that adopts among the HSDPA and high order modulation are not adopted by HSUPA.
Adopt the HSUPA technology, user's peak rate can reach 1.4-5.8Mbps.Compare with WCDMAR99, the network uplink capacity of HSUPA increases 20%-50%, increases by 25% Iub transmission capacity, and retransmission delay is less than 50ms, and coverage increases 0.5-1.0dB.
HSUPA increases a new exclusive use transmission signal channel and comes the transmission of high speed uplink packet access business.Existing Rel99DCH and E-DCH can coexist, so the user can enjoy in the R99 voice service traditional on DCH the transfer of data of utilizing HSUPA to happen suddenly at E-DCH.
The protocol architecture of HSUPA in the prior art (high speed uplink packet access) as shown in Figure 1, UE is connected with NodeB by the Uu interface, NodeB passes through the lub interface and is connected with RNC; MAC-es among Fig. 1 (being used to handle the medium access control entity of E-DCH (enhancing special uplink channel) transmission channel) and MAC-e entity are that WCDMA (Wideband Code Division Multiple Access (WCDMA) access) system introduces after the HSUPA MAC of increase (medium access control) layer entity.Wherein in order to support the fast dispatch of NodeB, the MAC-e entity of UTRAN (Universal Terrestrial Radio Access Network network) side has moved down into NodeB; In order to support the grand diversity of HSUPA, MAC-es is positioned at RNC (radio network controller).
Use the UE of E-DCH for each, at MAC-e entity of each Node B configuration, configuration MAC-es entity in RNC; E-DCH is used in the MAC-e entity control that is arranged in Node B, and is connected with MAC-es entity among the RNC; Increase the E-DCH transmission channel between MAC layer and the physical layer and carried transmission data block.Physical layer has increased several physical channels, uplink physical channel has increased E-DPCCH (E-DCH Dedicated Physical Control Channel) and E-DPDCH (E-DCH Dedicated Physical Data Channel), down physical channel has increased E-AGCH (E-DCH absolute grant channel), E-RGCH (E-DCH relative authorization channel) and E-HICH (E-DCH HARQ answering indication signal channel).Up E-DPDCH is used to carry the transmission data of HSUPA user uplink; Up E-DPCCH carries the signaling of following of demodulating data channel E-DPDCH.Descending E-AGCH is a common signal channel, is served the sub-district indication maximum available transmission rate of UE (subscriber equipment) (perhaps power) at E-DCH wireless connections place by the user; Descending E-RGCH is a dedicated channel, the fastest can be by the uplink speed of 2ms time rapid adjustment UE; Descending E-HICH is a dedicated channel, the ACK/NACK information whether feedback user receiving process data are correct.
HSUPA supports soft handover, exist soft handover to merge gain, but the Serving cell of E-DCH can only have one, and user's E-AGCH only is present in the Serving cell of E-DCH, is used to determine the maximum rate of the up transmission of UE, and the adjustment of this maximum rate is at a slow speed.By the E-RGCH of Serving cell, can control the increase and the minimizing of UE uplink speed at any time according to different scheduling strategies.But not can only have E-RGCH in the Serving cell of E-DCH, and can only control not limiting speed of UE downward modulation speed or this sub-district, can not directly control UE and raise speed.As seen the selection of E-DCH Serving cell is most important, has directly determined the throughput of user uplink.
In the prior art, the E-DCH Serving cell selection normally based on the down-run survey of UE, the pilot channel and relatively of UE by measuring each adjacent area determined descending optimum subdistrict, reports network terminal then, changed the Serving cell of E-DCH by network terminal.
Prior art is only considered downlink signal quality, and in the FDD of WCDMA standard, uplink and downlink use different frequencies, the fading characteristic of different frequent points, load interference level and characteristic are incomplete same, under some scene even have than big-difference, such as around certain machine station, up irregular interference might appear, iff just discerning by descending pilot tone judgement.
Summary of the invention
Purpose of the present invention just provides a kind of Serving cell appraisal procedure, considering on the auxiliary descending pilot frequency based measurement of UE, the up characteristic of additional consideration makes the E-DCH Serving cell be carried to the sub-district of up optimum all the time, reaches the purpose that improves the user uplink throughput.The present invention realizes purpose of the present invention by following technical solution: the Serving cell that the invention provides a kind of high-speed uplink packet access technique is determined method, comprises the steps: the definite up optimum subdistrict that uses high speed uplink packet to insert the terminal UE of HSUPA of radio network controller (RNC);
When terminal is carried on the E-DCH channel, RNC judges whether current definite up optimum subdistrict is effective, if effectively, then described up optimum subdistrict is defined as the Serving cell of E-DCH channel, and export the Serving cell of this E-DCH, otherwise the descending optimum subdistrict that described radio network controller (RNC) is initially determined is defined as the Serving cell of E-DCH, and exports the Serving cell of this E-DCH.
In the up optimum subdistrict of the terminal UE of the definite use of described step radio network controller (RNC) high speed uplink packet access HSUPA, the up optimum subdistrict of determining terminal is definite according to the quality of corresponding up link.
The correct bag of adding up when the quality of described up link accounts for the percentage of total reception bag or reception for the correct bag added up in predetermined period bag reaches default bag number accounts for the percentage of total reception bag.
If the correct bag of other sub-district of this terminal correspondence accounts for the percentage of total reception bag greater than the percentage and a predetermined percent value sum that account for total reception bag at present as the correct bag of Serving cell, is up optimum subdistrict with described other cell update then.
If the correct bag of other sub-district of this terminal correspondence accounts for the percentage of total reception bag greater than percentage and a predetermined percent value sum of accounting for total reception bag at present as the correct bag of Serving cell, and continuing a predetermined duration, is up optimum subdistrict with described other cell update then.
The descending optimum subdistrict that described radio network controller (RNC) is initially determined is the descending optimum subdistrict that user equipment (UE) reports to RNC.The descending optimum subdistrict that described radio network controller (RNC) is initially determined is that the initial RRC that initiates of UE sets up the sub-district of request.When determine to use high speed uplink packet to insert in the step of up optimum subdistrict of terminal of HSUPA at described radio network controller (RNC), when radio network controller (RNC) can't be determined the up optimum subdistrict of terminal, then " descending optimum subdistrict " is defined as the Serving cell of E-DCH.
Utilize technique scheme of the present invention, guaranteed that E-DCH is carried on up optimum subdistrict all the time, improve user's throughput; When avoiding independent consideration up, performance in some cases reduces, and does not send out data for a long time such as user uplink; By sluggish and delay trigger means, avoid the frequent updating problem that causes in the up optimum subdistrict evaluation process.The present invention accounts for total receiver packet number purpose percentage mode as a comparison by correct bag in time assessment cycle, and the problem of avoiding the difference because of the active set link joining day directly to compare has shortened the corresponding time.
Description of drawings
Preferred implementation of the present invention is described below with reference to the accompanying drawings, wherein:
The protocol architecture figure that Fig. 1 prior art high speed uplink packet inserts;
The overall flow figure of Fig. 2 technical scheme of the present invention;
Up optimum subdistrict is judged schematic diagram among Fig. 3 the present invention;
In all above-mentioned accompanying drawings, identical label represents to have identical, similar or corresponding feature or function.
Embodiment
The present invention is described further below in conjunction with accompanying drawing.
Below in conjunction with flow chart 2, describe technical scheme of the present invention in detail:
RRC (Radio Resource Control: radio resource control) connect foundation, and behind the judgement use HSUPA, carry out following flow process:
1) sets up measurement control; RNC sending measuring control messages requires UE to set up the measurement control that optimum subdistrict reports:
RNC sends to UE and comprises the RRC message of measuring control messages (MEASUREMENT CONTROL), requires UE to report the optimum subdistrict of UE down-run survey.
Measure control message is used for setting up, revising and discharge the measurement of UE; The measurement of UE can be divided into common frequency measurement, different-frequency measure, isosystem measurement, measuring business volume or the like, the difference in functionality of UTRAN or process, can use the measurement of same type as sub-district gravity treatment, switching, power control etc., UE must support a plurality of measurements to carry out simultaneously, and can control and report each measurement separately.UTRAN is by sending a measurement among MEASUREMENT CONTROL message or the broadcast control UE.The measurement control messages of terminal has broadcasting in system message, if under connection mode, network need be revised when measuring particular content, parameter, just uses the measurement control messages of RRC.
2) determine the Serving cell of E-DCH for the first time; When UE when non-CELL _ DCH state enters CELL_DCH state (dedicated channel status), when speed surpasses default thresholding, then RNC sends the transmission bearer reconfiguration message to UE and it is carried to the purpose that the words is write here on the E-DCH channel and is? If there is multi wireless links in UE current active collection, promptly the sub-district number is then measured all active set cell downlink signal quality at UE greater than 1 in the active set, and after reporting descending optimum subdistrict, the descending optimum subdistrict that RNC will identify is defined as the E-DCH Serving cell; Certainly, also do not report at UE under the situation of descending optimum subdistrict incident, the sub-district that UE initially can be initiated RRC foundation request is defined as " descending optimum subdistrict "; RNC can be defined as the E-DCH Serving cell with this descending optimum subdistrict; Wherein, descending optimum subdistrict determines what UE also determined more then by the pilot channel of measuring each adjacent area.For the ease of understanding, simply introduce the method that feature and UE about the CELL_DCH state enter the CELL-DCH state below, the CELL_DCH state has following feature:
(1) distributed a DPCH in uplink and downlink to UE;
(2) can know the sub-district at UE place according to the current active set of UE;
The combination of (3) UE can use dedicated transmission channel descending/up shared transmission channel or these transmission channels.
It can be following two kinds of methods that UE enters the CELL_DCH state:
(1) UE RRC connection under idle pulley is based upon on the special-purpose trade, so UE enters the CELL_DCH state from idle pulley;
(2) UE uses dedicated transmission channel to make UE enter into the CELL_DCH state from the CELL_FACH state after being in and using Common transport channel to switch by channel type under the CELL_FACH state.UE enters the CELL_DCH state and is not limited to this in the present invention, enters the CELL_DCH state according to the communication protocol of reality and gets final product.
3) " up optimum subdistrict " assessment; Method is as follows:
A) determine every link (link in each sub-district) correct number that wraps in preset range (this parameter is configurable), preset range can be a period of time, it also can be the number of bag, present embodiment is given an example in the mode that adopts the time cycle: when the upstream data bag of different links arrives, according to the indication of mistake piece, select packet, and in the preset time period scope, the statistical correction bag accounts for total receiver packet number purpose percentage; Concrete steps are as follows:
I) in one-period, if receive the upstream data bag, Total=Total+n then, wherein, Total is in the one-period, the data block total number order of up reception, n are the number of data blocks that comprises in the upstream data bag;
II) to each uplink data block, if " mistake piece indication " be correctly, good=good+1 then, wherein good is in the one-period, the correct number of data blocks that receives;
III) one-period finish time, calculate the percentage that correct bag accounts for total reception bag: COUNT_GOOD=good/Total * 100%;
B) value of the counter of the more different links of period ratio, and the sub-district that the COUNT_GOOD value is maximum is defined as " up optimum subdistrict ", but this cycle separate configurations also can adopt with to wrap measurement period identical, present embodiment is described in conjunction with Fig. 3 to be example with the identical value of bag measurement period:
I) the correct bag percentage of establishing current " up optimum subdistrict " is COUNT_GOOD
Best, the correct bag percentage of other active set cell is COUNQT_GOOD
AS
II) if COUNT_GOOD
AS＞COUNT_GOOD
Best+ Hyst;
III) and lasting time-to-trigger duration, time-to-trigger then upgrades up optimum subdistrict and is sub-district Cell in other active set for the user can independently be provided with parameter
ASCell
ASFor with COUNT_GOOD
ASCorresponding active set cell; Because Hyst and time-to-trigger are predefined values, it all is a constant, the value of Hyst is a percentage constant, time-to-trigger postpones the triggered time, the effect that can reach sluggish and postpone to trigger, the present invention avoids the frequent updating problem that causes in the up optimum subdistrict evaluation process by sluggish and delay trigger means;
C) when wrapping measurement period in the time, during the free of data input, the correct bag that also promptly can't obtain to compare receives percentage, and mark " up optimum subdistrict " is invalid; For example in the judgement of initial E-DCH sub-district; Certainly the present invention is not restricted to add up in one-period for statistical correction bag percentage, also can adopt the mode of default bag number, and promptly when the number of bag reached default thresholding, statistics output was correctly wrapped and being accounted for total receiver packet number purpose percentage.It will be understood by those skilled in the art that up optimum subdistrict determine can also determine according to other quality of reception of each bar up link except according to the correct bag percentage, as signal to noise ratio etc.
4) " descending " optimum subdistrict assessment; Upgrade measurement report if receive the optimum subdistrict that UE reports, then upgrade " the descending optimum subdistrict " of network side sign; If UE reports the optimum subdistrict update event according to the result who measures, the cell ID after then will upgrading is " a descending optimum subdistrict "; If UE does not report descending optimum subdistrict incident, the sub-district of then UE initially being initiated RRC foundation request is defined as " descending optimum subdistrict ";
5) the E-DCH Serving cell determines; Take all factors into consideration the Serving cell of " up optimum subdistrict " and " descending optimum subdistrict " output E-DCH, when " up optimum subdistrict " or " descending optimum subdistrict " upgrades, judge the Serving cell of E-DCH:
If a) current " up optimum subdistrict " is effective, then up optimum subdistrict is defined as the Serving cell of E-DCH;
B) if current " up optimum subdistrict " is invalid, then " descending optimum subdistrict " is defined as the Serving cell of E-DCH;
6) renewal of E-DCH Serving cell; If up-to-date definite E-DCH Serving cell is different with former E-DCH Serving cell, then reshuffle the Serving cell that signaling and radio link reconfiguration signaling terminal and base station are upgraded E-DCH by physical channel respectively.
Repeat " assessment of up optimum subdistrict " and " assessment of descending optimum subdistrict " step, so that determining and renewal of E-DCH Serving cell to be provided.
The means of each method of realization of describing in the present embodiment all are the prior aries of comparative maturity, for per step be just giving unnecessary details no longer one by one here of how realizing.For the flow process of the inventive method, the precedence that is not limited to describe in the foregoing description just can realize purpose of the present invention as long as carried out the definite of definite and up optimum subdistrict of descending optimum subdistrict before determining the E-DCH Serving cell to terminal.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the Serving cell of a high-speed uplink packet access technique is determined method, comprises the steps:
Radio network controller (RNC) determines to use high speed uplink packet to insert the up optimum subdistrict of the terminal of HSUPA;
When terminal need be carried on the E-DCH channel, RNC judges whether current definite up optimum subdistrict is effective, if effectively, then described up optimum subdistrict is defined as the Serving cell of E-DCH channel, and export the Serving cell of this E-DCH, otherwise the descending optimum subdistrict that described radio network controller (RNC) is initially determined is defined as the Serving cell of E-DCH, and exports the Serving cell of this E-DCH.
2. the Serving cell of high-speed uplink packet access technique according to claim 1 is determined method, it is characterized in that, in the step of the up optimum subdistrict of the terminal of the definite use of described radio network controller (RNC) high speed uplink packet access HSUPA, the up optimum subdistrict of determining terminal is definite according to the quality of corresponding up link.
3. the Serving cell of high-speed uplink packet access technique according to claim 2 is determined method, it is characterized in that the correct bag of adding up when the quality of described up link accounts for the percentage of total reception bag or reception for the correct bag added up in predetermined period bag reaches default bag number accounts for the percentage of total reception bag.
4. the Serving cell of high-speed uplink packet access technique according to claim 3 is determined method, it is characterized in that, if the correct bag of other sub-district of this terminal correspondence accounts for the percentage of total reception bag greater than percentage and a predetermined percent value sum of accounting for total reception bag at present as the correct bag of Serving cell, is up optimum subdistrict with described other cell update then.
5. the Serving cell of high-speed uplink packet access technique according to claim 4 is determined method, it is characterized in that, if the correct bag of other sub-district of this terminal correspondence accounts for the percentage of total reception bag greater than percentage and a predetermined percent value sum of accounting for total reception bag at present as the correct bag of Serving cell, and continuing a predetermined duration, is up optimum subdistrict with described other cell update then.
6. determine method according to the Serving cell of each described high-speed uplink packet access technique in the claim 1 to 5, it is characterized in that the descending optimum subdistrict that described radio network controller (RNC) is initially determined is the descending optimum subdistrict that user equipment (UE) reports to RNC.
7. determine method according to the Serving cell of each described high-speed uplink packet access technique in the claim 1 to 5, it is characterized in that the descending optimum subdistrict that described radio network controller (RNC) is initially determined is that the initial RRC that initiates of UE sets up the sub-district of request.
8. the Serving cell of high-speed uplink packet access technique according to claim 6 is determined method, it is characterized in that, when determine to use high speed uplink packet to insert in the step of up optimum subdistrict of terminal of HSUPA at described radio network controller (RNC), when radio network controller (RNC) can't be determined the up optimum subdistrict of terminal, then " descending optimum subdistrict " is defined as the Serving cell of E-DCH.
9. the Serving cell of high-speed uplink packet access technique according to claim 7 is determined method, it is characterized in that, when determine to use high speed uplink packet to insert in the step of up optimum subdistrict of terminal of HSUPA at described radio network controller (RNC), when radio network controller (RNC) can't be determined the up optimum subdistrict of terminal, then " descending optimum subdistrict " is defined as the Serving cell of E-DCH.
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| CN101237270B (en) * | 2007-02-01 | 2012-11-28 | 中兴通讯股份有限公司 | A method for the node B to get retransfer interval control information |
| BRPI0806353A2 (en) * | 2007-02-02 | 2011-09-06 | Interdigital Tech Corp | improved cell_fach state selection / update |
| CN101242572B (en) * | 2007-02-05 | 2012-05-09 | 中兴通讯股份有限公司 | Data receiving and transmission method under non cell dedicated channel status in continuous mode |
| KR20140019849A (en) * | 2008-01-02 | 2014-02-17 | 인터디지탈 패튼 홀딩스, 인크 | Method and apparatus for cell reselection |
| CN101616057B (en) * | 2008-06-23 | 2013-06-05 | 电信科学技术研究院 | Method, device and system for releasing resources in uplink transmission reinforcement |
| CN109067511B (en) * | 2018-09-27 | 2021-04-02 | 深圳友讯达科技股份有限公司 | Communication method and device of dual-mode communication network |
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| CN1428952A (en) * | 2001-12-25 | 2003-07-09 | 深圳市中兴通讯股份有限公司上海第二研究所 | Macro diversity control method of new call establishment stage |
| CN1694571A (en) * | 2004-05-04 | 2005-11-09 | 三星电子株式会社 | Method and apparatus for selecting serving scheduling cell for soft handover user equipment |
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| WO2000056103A1 (en) * | 1999-03-17 | 2000-09-21 | Motorola Limited | A subscriber unit and method of cell selection for a cellular communication system |
| JP2000269881A (en) * | 1999-03-17 | 2000-09-29 | Yrp Mobile Telecommunications Key Tech Res Lab Co Ltd | Cdma mobile communication system |
| CN1428952A (en) * | 2001-12-25 | 2003-07-09 | 深圳市中兴通讯股份有限公司上海第二研究所 | Macro diversity control method of new call establishment stage |
| CN1694571A (en) * | 2004-05-04 | 2005-11-09 | 三星电子株式会社 | Method and apparatus for selecting serving scheduling cell for soft handover user equipment |
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