CN1833376A - Method for soft and softer handover in time division duplex code division multiple access(tdd-cdma) networks - Google Patents

Abstract

A wireless communication system, method and apparatus are provided for soft and softer handover of a mobile wireless transmit/receive unit (WTRU) between two or more base stations and/or base station sectors. A network control unit assigns selected base stations to transmit communication data to the WTRU based on the WTRU being disposed in base station or base station sector geographic range of service. A WTRU joint detector (JD) receiver is configured to receive and process one or more wireless data signals in each of a series of timeframes where each signal received within a common timeslot has a unique channel encoding of the same communication data. The JD receiver has a plurality of channel estimators that estimate received signals within a common timeslot and a combiner configured to decode and combine the channel estimates to derive a resultant data signal.

Description

Soft and softer handover method in time division duplex code division multiple access (TDD-CDMA) network

Technical field

Generally speaking the present invention system is relevant to the handing-over in wireless communication system, and specifically, the present invention system is relevant to the soft and softer handing-over in the TDD-CDMA network.

Background of invention

Nouns such as base station, wireless transmission/receiving element (WTRU) and mobile unit, system is used with its general meaning, and when using, one wireless transmission/receiving element (WTRU) comprises, but be not subject to, one user's equipment, portable terminal, travelling carriage is fixed or the device that can operate in a wireless environment of mobile subscriber terminal, calling set or any other kenel, WTRUs system comprises personal communicator, for example phone, picture telephone and have the world-wide web phone that network connects.In addition, WTRUs also comprises the Portable personal computer device, for example, PDAs and mobile computer with radio modem similar to network capabilities, portable or WTRUs that can shift position system is called mobile unit, when mentioning after this, one base station is a WTRU, and this WTRU system comprises, but is not subject to a base station, Node B, positioner (site controller), access point or other interface arrangement in a wireless environment.

A 3G (Third Generation) Moblie partner cooperate to plan (3GPP) or with the similar system of 3GPP in, time division duplex (TDD) radio communication system is encoded with scrambling code (scrambling codes), spreading codes (spreadingcodes), and, be predetermined the training sequence of preface sequence (midamble) in being known as, and should middle preface sequence be the signal that helps construction again originally to transmit.When setting up a special base station and the binding between its WTRUs that serves, each base station clone can use one to be one scrambling code, with the base station of difference in this network, spreading codes then is that the data exhibition that is relevant to each WTRU is the fragment across the frequency bandwidth the same with other WTRU frequently, it is to utilize the spreading codes of a uniqueness to indicate each other data-signal, to allow data reconstruction at receiver, should middle preface sequence be a private part of a tdm channel time slot, and during this tdm channel time slot system is included in channel and estimates frequently, be used in a known code sequence of receiver.

In many wireless communication systems, many communication system can be shared identical radio frequency frequency spectrum (radiofrequency spectrum), when receiving a special communication, all use the communication system of same frequency spectrum to cause interference to this special communication, the result who is caused is, increase the signal quality of the accurate system in delivering power position meeting degradation all other communications in this spectral range of a communication, yet, transmit the accurate too many words in communication position if reduce this, then can cause undesired received signal quality, for example, can be by in the signal noise ratio (SIRs) of receiver and measured.In system so, delivering power control algolithm system is used.

Wireless communication system various opened and the method for loop circuit power control lies in the known techniques to known, so the purpose of system is, propagate disturbing under the situation that exists of (fading propagation) and variation in time in a decline, change conveyer power apace, with in guaranteeing that data are in the long-range received while, to minimize conveyer power with the quality that can accept.Method is that delivering power control is divided into program separately, be called outer-loop power control (outer loop power control, OLPC) and the control of home loop power (inner loop power control, ILPC).

In this outer-loop power control, the power level system of one special conveyer is based on a target SIR numerical value, when a receiver receives these transmission, the quality system of the signal that is received can be measured, this information that has transmitted is then at transport block (transport blocks, TBs) send in the unit, and, signal quality that this institute receives system can block error rate (block error rate BLER) is measured as the basis, and this BLER is by this receiver, typically, (cyclic redundancy check CRC), and is assessed a Cyclical Redundancy Check by data.The BLER system that this is assessed can compare with a target quality demand, and service quality (quality of service, QoS) demand of a target BLER like this system representative various data, services kenels on this channel.As the basis, a target SIR is adjusted control signal system and is sent to this conveyer with measured received signal quality, and this conveyer then can respond these and adjust requirement and adjust this target SIR.

In 3GPP wide band code division multiple access (W-CDMA) system that uses time division duplex (TDD) pattern, network system can be set to initial target SIR the WTRU that sets up (call/sessionestablishment) in call/session, then, in being subjected to joining line (uplink, UL) during the order of the observation of BLER measurement, continue and during the natural duration of life (life term) of this calling, adjust this target SIR of this WTRU continuously.

In this home loop power control, the signal quality that this receiver system can receive this institute, SIR for example, a measurement and a critical value (that is, this target SIR) compare, if when this SIR surpasses this critical value, then can send delivering power instruction (the transmit power command that reduces this power level, TPC), when being lower than this critical value, then can send a TPC who increases this power level as if this SIR.Typically, this TPC system utilizes the data in a dedicated channel and is multiplexed into this conveyer, and the TPC that receives in order to respond, this conveyer system can change its delivering power position standard.

Fig. 1 shows to comprise base station BS1 and BS2, with the calcspar of the part of the wireless network architecture of WTRU1, WTRU2 and WTRU3.These base stations are the binding between this communication network and this WTRU, this network (not shown) system is responsible for sending information to its correct destination along route, monitor a plurality of base stations, management is provided the Radio Resource in the geographic areas scope of wireless radio wave service coverage of service by these base stations, and the entity Radio Resource that is controlled at the interface between this base station and the WTRU.Base station BS1 lies in the zone 11 and transmits, and base station BS2 lies in the zone 12 and transmits, and 13 overlapping regions of representative between these two base stations, zone, and WTRU1 system is present in wherein.In this example, WTRU1 is what move, and be to move to zone 12 from zone 11, as situation so, WTRU1 is the candidate of a handing-over, when in the zone WTRU in 11 and the system of the WTRU2 in zone 12 located, to communicate with the base station BS1 and the BS2 that interrelate with it respectively fully.

Fig. 2 system is presented under the softer handing-over situation calcspar of the part of a wireless network operations.In softer handing-over, the two or more section system of a single base station can transmit and receive the signal of a WTRU, and at this, base station BS system transmits and receives according to section 21 and 22.Among there is section 22 in WTRU2 and WTRU3 when being present among the section 21, they do not need handing-over because their position system allow they and its base station section respectively each carry out efficient communication.Yet because WTRU1 system is present among the overlap section 23 that drops on section 21 and section 22 simultaneously, therefore, WTRU1 lies in it to carry out between section 21 and 22 when mobile, becomes a candidate of softer handing-over.

In communication network, the needs of handing-over of management and control WTRUs are very important.Known soft handing-over (SHO) is to be used in the FDD-CDMA network, comprises IS-95, CDMA 2000 and 3GPP WCDMA, and soft handing-over system can improve usefulness when that WTRU is positioned at is comparable when power train is received from the position of two or more base stations (BSs).

At present, in standard 3GPP TDD WCDMA system, only there is hard handing-over to support, all the same to high and low chip rate variable.In hard handing-over, the transmission and the reception of the signal between WTRU1 and base station BS1 and BS2 and be unlike in the soft handing-over equally smooth-going, or as between the section in the softer handing-over 21 and 22.In hard handing-over, when if the communication that transits to this second base station or section only stops in this first communication along with WTRU1, just can begin.Therefore, provide a method of in the TDD cdma network, carrying out soft handing-over will produce the capacity of increase and the benefit of coverage.

Summary of the invention

One device, a system and method system are suggested, and carry out radio communication to have in the network system of a plurality of base stations one, and wherein, WTRU system is received in the communication data of optionally being encoded and transmitting in the pre-defined time news frame.This WTRU has a contact detector receiver, it is to receive and handle multiple downlink link wireless signal, each signal cording that is received in the scope that has altogether with time slot has one of the same communicated data from these a plurality of base stations unique channel coding, a plurality of channels are estimated device frequently, it is this unique code based on this received signal, and in altogether with the time slot scope, produce a channel assessment of received signal respectively, one colligator system receives the channel assessment from all these channel estimator, and be combined in altogether these channel assessments with each data-signal that is received in the time slot, and become a combined data signal, by this, common this communication data of these a plurality of signals that received in this common time slot is then derived from this binding signal.

The base station cording that this mobile WTRU is redistributed in soft handing-over has a contact to detect receiver, it comprises that a plurality of channels estimate in its geographic area or cell scope that is construction with the base station redistributed at this of device frequently, processing is from the respective uplink signals of each WTRU, in preface sign indicating number sequence system handled by channel estimator, with produce this uplink signals channel assessment.This base station receiver also comprises a data assessment device, its be utilize relevant be connected in this base station carry out a plurality of scrambling codes of this WTRUs of up link communication and spreading codes and handle these channel assessments, this data assessment device is that construction is to handle the scrambling code S that all WTRUs were used that is dispensed to this base station that itself is assigned to _New, and in softer handing-over the relevant scrambling code S that is connected in this WTRU _Old, its this softer handing-over is the relevant base station that participation is also arranged in this soft handing-over that originally this WTRU is assigned with that is connected in.At last, decoder system be used for decoding data evaluator output signal this circle round or turbine code, to be created in the data-signal of construction again that transmits in this up link communication.

Description of drawings

Fig. 1: it is to be presented in the overlapping region, comprises the calcspar of the communication network of two base stations and at least one WTRU;

Fig. 2: it is to be presented in the overlapping region, comprises the calcspar of the communication network of a base station with two sections and at least one WTRU;

Fig. 3: it is network service information exchange graphic that shows soft handing-over;

Fig. 4: it is network service information exchange graphic of the softer handing-over of demonstration;

Fig. 5: it is to show the calcspar that participates in a communication network that has joining line under the WTRU (downlink) communication in the soft handing-over;

Fig. 6: it is to show to handle the calcspar that one of soft handing-over WTRU contact detects receiver (joint detectionreceiver); And

Fig. 7: it is to show the calcspar that participates in a communication network that has joining line on the WTRU (uplink) communication in the soft handing-over.

Embodiment

Though embodiment system utilizes one of time division duplex (TDD) pattern 3G (Third Generation) Moblie partner to cooperate to plan (3GPP) wide band code division multiple access (W-CDMA) system with combination and is narrated, but the embodiment of this case system is used in any time slot and cuts apart the code division multiple access (CDMA) of (time slotted) or mixing/time division multiple access (TDMA) communication system, comprises TD-SCDMA.

Fig. 3 is sequence information graphic that show to participate in one of soft handing-over TDD-CDMA network.The entity that is involved in soft handing-over is network, a WTRU, one first (old) base station and one second (new) base station, this framework shown in Figure 1 is as reference, WTRU1 system represents WTRU, then for having this old base station of originally setting up the WTRU of communication, BS2 then is this new base station towards mobile mobile WTRU to base station BS1.The receiver of the signal that WTRU1 and base station BS1, BS2 both uses can be incorporated on the multipath to be received.

This exchange originates in line 31 and 32, at this, network signal system on the broadcasting channel (BCHs) of base station BS1 and BS2 is received by WTRU1, preferably be configured as main common controlled entity channel (primary common control physicalchannels as beacon signal (beacon signals), P-CCPCHs), this exchange lies in joining line home loop power control (uplink innerloop power control, UL-ILPC) in the context, then, online 33 places, signal code power (the received signal codepower that this institute from this beacon signal receives measures in WTRU1 system, PSCP), and, this PSCP measurement is sent to network via this old base station BS1.At this, in order to simplify, this example lies in the context and describes with two base stations, yet, WTRU1 is the signal strength signal intensity that can monitor the beacon signal that all contiguous base stations are transmitted unceasingly, and measure it and divide other RSCPs, these Departments of Survey can be network-reporting, and based on these measurements of reporting, network can pick out this new base station BS2, with as the soft handing-over of WTRU1 (soft handover, candidate SHO), and can be in view of the above and the SHO of WTRU1 is used in decision.New base station BS2 system can receive the notice (line 34) that arrives the new appointment of one of WTRU1 for SHO, and this network can notify this BS2 just entering scrambling code and the spreading codes of the WTRU1 of SHO now, then, WTRU1 system is notified via BS2, BS2 has been assigned to SHO (line 35), comprise employed scrambling code of base station BS2 and spreading codes that this is new, be preferably, go up the sender at downlink link application-specific entity control channel (DL-DPCCH), point at this moment, SHO between WTRU1 and two base station BS1 and BS2 one simultaneously communication link system set up.

Downlink link communication data system is exchanged to WTRU1 via these two base station BS1 and BS2 from network, is preferably, on this downlink link dedicated physical channel (DL-DPCH), shown in online 36.To transmit be in addition synchronization in both downlink link data communication from BS1 and BS2, to take place at a news frame number that is predetermined and in having altogether with time slot.Data in this parallel downlink link communication are identical, and are by these two base station BS1 and BS2 and transmitted.

Contact detection (JD) receiver at WTRU1 has been that each base station BS1 and BS2 carry out a different channel assessment, by using known scrambling code.In an alternative example, this WTRU1 system can comprise that blind coding detects (blind code detection), with when sign indicating number when this JD receiver of sequencing, the restriction scrambling code only gives among other WTRUs those comparable or be the powerhouse than the sign indicating number that it had, and this can cause the usefulness improved.

From WTRU1, preferably on last joining line dedicated physical channel (UL-DPCH), up link communication data system received by these two SHO base station BS1 and BS2, and it is can this signal of demodulation (demodulate), and the result can be sent to network (line 37).When receiving, network can be carried out a Cyclical Redundancy Check on the data that received (cyclic redundancy check, CRC) test do not detect mistakenly that a group of receivers data system can be retained and quilt is continued to be passed to core network and do not have a CRC.

Loop circuit outer-loop power control system is used to the downlink link of two chip rate variablees of 3GPP TDD-WCDMA, the SIR of reception of the combination output of this JD receiver can measure in this WTRU system, then, it then transmits up/down delivering power control (transmit power control, TPC) instruct to base station BS1 and BS2 (line 38), these base stations can be deciphered this TPC instruction, and adjust its delivering power in view of the above.

Open on the 3GPP TDD-WCDMA that loop home loop power control system is used to use high chip rate variable in the joining line.The received power from the beacon channel of each base station can be measured by this WTRU system, read the interference power of the periodic report of each base station, and transmit one and enough make each base station in SHO reach the power of the target SIR of a signal transmission.In order to reach this effect, WTRU1 system can cycle through each base station, periodically measure beacon power and reading of data, network is then guaranteed the generation that do not conflict between each the base station BS1 among SHO and BS2 receive the special-purpose traffic time slot (traffic time slot) of broadcast data and WTRU1.Be preferably, this is reached by all broadcasting time slots being assigned as generation simultaneously, and WTRU1 system needs with lowest power and transmits, to reach this target SIR at BS1 and BS2.Shown in online 39, this network system can try to adjust this target SIR s of each base station, to guarantee that one of them will receive an error-free information (error-freemessage) at least.WTRU1 can receive these target SIR s, is preferably on this DL-DPCCH.

Fig. 4 is sequence information graphic that show to participate in a TDD-CDMA network of softer handing-over, and this is to be similar to Fig. 3 as with reference to the soft handing-over of being explained.The entity that is involved in softer handing-over is this network, a WTRU, one first (old) base station section and one second (new) base station.As reference, it is this old base station section that WTRU1 system represents WTRU, 21 of sections with framework shown among Fig. 2, and its originally be this WTRU set up the correspondent, and section 22 is this new base station section towards mobile mobile WTRU1.

Exchange system beginning online 41 and 42, in this, the network signal system on the BCHs of old and new base station section 21 and 22 is received by WTRU1, with as the beacon signal that is configured as P-CCPCHs.This exchange ties up to interior generation of context of UL-ILPC, then, online 43, the RSCP from this beacon signal can measure in WTRU1 system, and RSCP measured be sent to this network via this old base station section 21, in order to simplify, this example system makes an explanation with the context of two base station sections, yet, base station system can have the section more than two, and in each example, and WTRU1 system can monitor the signal strength signal intensity of the beacon signal that all contiguous base station sections are transmitted continuously, and measure it and divide other RSCPs, these measurements then can be reported to this network, and the basis that is measured as to be reported, this network system can pick out this new base station section 22, with a candidate, and use the softer HO of decision WTRU1 in view of the above as the softer HO of WTRU1.New base station section 22 is to receive the notice (line 44) that arrives the new appointment of one of WTRU1 for softer HO, and this network can be notified this new base station 22, now just entering scrambling code and the spreading codes of the WTRU1 of softer HO, then, WTRU1 system is notified via old base station section 21, new base station 22 has been assigned to softer HO (line 45), comprise this new base station section 22 employed scrambling code and spreading codes, be preferably, sender on a DL-DPCCH, point at this moment, softer HO between WTRU1 and two base station sections 21 and 22 one simultaneously communication link system set up.

Downlink link communication data system is preferably, on this DL-DPCH, shown in online 46 via these two base station sections 21 and 22 and exchanged to WTRU1 from this network.Transmitting from base station section 21 and 22 both downlink link data communication is in addition synchronization, with in a news frame number generation that is predetermined.And the data in this parallel downlink link communication are identical, but are transmitted by these two base station sections, its difference is, particularly to dividing other base station section, the scrambling code of difference.Detecting (JD) receiver at the contact of WTRU1 has been each base station section 21 and 22 and carry out a different channel assessment, by using known scrambling code.This WTRU1 system can comprise that blind coding detects (blind code detection), with in when sign indicating number of this JD receiver of sequencing, limit these yards and only give among other WTRUs those comparable or be the powerhouse, and this can cause the usefulness improved than the sign indicating number that it had.

From WTRU1, preferably on a UL-DPCH, up link communication data, it is received by the JD receiver of these base stations BS, and it is can demodulation (demodulate) and this parallel signals of soft combination section 21 and 22, and the result can be sent to network (line 47).When receiving, this network system can be carried out CRC test on the data that received, detect wrong group of receivers data and do not have a CRC, is can be retained also to be continued to be passed to core network.Softer HO is noted that owing in the performed data combination of base station BS, therefore only have one group of data to be received from WTRU1.

Loop circuit outer-loop power control relevant for softer HO downlink link, the SIR of reception of this combination output of its JD receiver can measure in this WTRU system, then, it then transmits a TPC and instructs to base station BS (line 48), and it ties up to each base station section 21 and 22 and is received.This base station JD receiver is understood soft combination and is deciphered these parallel TPC instructions, to produce the instruction of TPC as a result of this network.

Control relevant for the loop home loop power of opening that is used for softer HO, the received power from the beacon channel of each base station section can be measured by this WTRU system, read the interference power of the periodic report of each base station section, and transmit one and enough make each base station in HO reach the power of the target SIR of a signal transmission.In order to reach this effect, WTRU1 system can cycle through each base station section, periodically measure beacon power and reading of data, this network then is to guarantee the generation that do not conflict between each base station section 21 among softer HO and 22 receives the special-purpose traffic time slot (traffictime slot) of broadcast datas and WTRU1.Be preferably, this is reached by all broadcasting time slots being assigned as generation simultaneously, and WTRU1 system needs with lowest power and transmits, to reach this target SIR at section 21 and 22.Shown in online 49, this network system can be adjusted this target SIR of this base station BS, this to section 21 and 22 both also be the same.WTRU1 can receive these target SIR s from each base station section 21 and 22, is preferably on this DL-DPCCH.

Though it will be appreciated that Fig. 3 and Fig. 4 are stated as separately program with soft and softer handing-over,, according to a base station of the present invention system can be simultaneously soft the and softer handing-over of one or more WTRUs execution both.

Fig. 5 system is presented at during the SHO, and it comprises network controller N the calcspar of a network architecture, base station BS1 and BS2, and mobile unit WTRU1, WTRU2 and WTRU3.Base station BS1 system comprises an encoder 51 and a conveyer 61, and base station BS2 then comprises an encoder 62 and a conveyer 52, and each base station BS1 and BS2 system use by this network and one of distributed scrambling code Sb ₁, with spreading codes Cb ₁, and middle preface (midamble) sign indicating number sequence MAb ₁, this network system is according to the geographical service scope of selected base station, and WTRU1, WTRU2 and WTRU3 are dispensed to base station BS1 and BS2, though typically be to use multiple spreading codes, in order to simplify, only narrates a sign indicating number at this.Each WTRU system uses a scrambling code Sb ₁, with spreading codes Cb ₁, and middle preface sign indicating number sequence MAb ₁, with each of this cell of coupling service divide other base station employed those.

By the WTRU2 that base station BS2 is served, be the main scrambling code Su that use is dispensed to WTRU2 uniquely ₂, the employed scrambling code of BS2, spreading codes Cb ₂, and middle preface sign indicating number sequence MAb ₂, and by the WTRU3 that base station BS1 is served, be the main scrambling code Su that use is dispensed to WTRU3 uniquely ₁, the employed scrambling code of BS1, spreading codes Cb ₃, and middle preface sign indicating number sequence MAb ₃

Now, consider and two base station BS1 and the WTRU1 of BS2 in SHO.This WTRU1 is owing to served by BS1 at the beginning, thereby use is dispensed to the scrambling code Sb of WTRU3 uniquely ₁, and spreading codes Cb ₁, and middle preface sign indicating number sequence MAb ₁And in order to communicate with base station BS2, WTRU1 also uses Sb ₁, but with different spreading codes and middle preface sign indicating number sequence C b ₄And MAb ₄

See through network controller N, this network system can send the data DATA of WTRU1 ₁And the data DATA of WTRU3 ₃To base station BS1, at this, it is respectively with the spreading codes Cb at encoder 51 ₁And Cb ₃, scrambling code Sb ₁, and middle preface sign indicating number sequence MAb ₁And MAb ₃And handled, a binding signal is then corresponded to wireless channel, and is transmitted at conveyer 61 places.

Simultaneously, this network controller N system can send the copy data of WTRU1 and the data of WTRU2, to base station BS2, at encoder 62 places, is scrambling code Sb ₁, spreading codes Cb ₄, and middle preface sign indicating number sequence MaAb ₄Being applied to will be to the data-signal of WTRU1.Each WTRU1, WTRU2 and WTRU3 system all can receive the downlink link data-signal, and, utilize demodulation and decoding to handle these signals, these data-signals DATA that is sent by this network controller N with construction again ₁, DATA ₂, and DATA ₃WTRU1 received, and common downlink link data system is shown as from the DL1 of base station BS1 and from the DL2 of base station BS2.

Fig. 6 system describes a kind of in the WTRU1 of SHO, and a contact that is used for the downlink link signal processing detects the calcspar of (JD) receiver.The JD receiver of WTRU1 system by construction to receive and to handle the multiple wireless signal in each of a series of times news frames (timeframe), each signal lies in altogether and is received in the scope with time news frame and time slot, as with Fig. 5 as with reference to and being narrated, unique channel that identical communication data is encoded, it is that the source that can pick out signal is from BS1 during the SHO or BS2, and from the base station section 21 and 22 during the softer HO.This JD receiver system comprises channel estimator CHEST W11 and CHEST W12, a data assessment device 65, and a decoder 66.Two channel estimator CHEST W11 and CHEST W12 system can receive respectively downlink link signal DL1 and the DL2 from base station BS1 and BS2, and by preface sequence MAb in using ₁Assessment is from channel and the middle preface sequence MAb of base station BS1 ₄Assessment is from the channel of base station BS2, and CHESTW11 and CHEST W12 system can provide two channel assessments, h respectively ₁And h ₂, to data assessment device 65, this data assessment device 65 is to use Sb ₁And Cb ₁And jointly detect the data that sent by base station BS1, and use Sb ₁And Cb ₄And jointly detect the data that sent by base station BS4, data assessment device 65 is these data of meeting soft combination, and this data system then is sent to this decoder 66, at this, then any error code, for example, convolution code (convolution code) or turbine code (turbo code) are all can be decoded.Final output at this decoder 66 is data-signal DATA ₁, as in core network CN, being risen.

Fig. 7 system is depicted among the SHO, by handling with the up binding that the network architecture that shown person is identical in Fig. 5 is carried out.Mobile unit WTRU1, WTRU2 and WTRU3 system use scrambling code Su respectively ₁, Su ₂, and Su ₃, (that is WTRU1 has the original base station to BS1 and is equipped with the attached relation of original base station of this WTRU of reaction of this configuration system, and uses scrambling code Su accordingly ₁), mobile unit WTRU1, WTRU2 and WTRU3 system use spreading codes Cu respectively ₁, Cu ₂, and Cu ₃, and middle preface sequence MAu ₁, MAu ₂, and MAu ₃It it should be noted, be any new WTRU that enters a base station cell, as in the example of WRTU1, the spreading codes of that WTRU can be with the spreading codes of the WTRU in this base station cell scope be identical at present, normally, identical spreading codes can't be used by two WTRUs in same base platform cell, yet, in SHO, WTRUs can the identification in addition by different scrambling codes, see also Fig. 7, respectively for WTRU1 and WTRU2, scrambling code Su ₁And Su ₂Be unique, so that at spreading codes Cu ₁And Cu ₂When identical situation took place, base station BS2 can differentiate them.Identical, a common spreading codes normally also is not permitted for two different WTRUs that are sent to a single base station section, yet, during softer HO, because each WTRU has a different scrambling code, therefore, this base station can utilize identical spreading codes and differentiate two WTRUs.

This receiver of base station BS1 is that working load has MA ₁And MA ₃A single CHEST B11, to produce the channel assessment h in the path between WTRU1 and the BS1 _1A, the channel assessment h in the path between WTRU3 and the BS1 ₃, other base station cording has a contact to detect receiver, and contact detection receiver system comprises two channel estimator CHEST B21 and CHEST B22, one of them is used for not at the WTRU2 of SHO, and another is used for the WTRU1 at SHO.CHEST B21 system is used for being responsible for the employed scrambling code S1 of WTRU1, CHEST B 21 also can take into account the WTRUs among the comfortable SHO signal the time of advent with have controlled by base station BS2 in preface shift to an earlier date the not any possibility time sequence difference between the person in SHO of (timing advances).Channel estimator CHEST B21 system can handle and produce channel assessment h _1BMiddle preface sequence MA ₁, and simultaneously, channel estimator CHEST B22 then can handle and produce channel assessment h ₂Middle preface sequence MA ₂

The data assessment device 76 of base station BS1 is can remove scramble scrambling code S1 and remove exhibition spreading codes C1 and C3 frequently, at this, decoder 75 is further by any error code of decoding, for example, convolution code or turbine code, and handle these signals, the output of decoder 75 be construction again respectively from these data-signals DATA of WTRU1 and WTEU2 _1AAnd DATA ₃, similarly, data assessment device 77 and decoder 78 are these data-signal DATA of construction again from WTRU1 and WTEU2 _1AAnd DATA ₂At this, will normally expect at data assessment device 77 and will handle a relevant single scrambling code that is connected in base station BS2, and this single scrambling code (that is, Su ₂) be that it is to be given processing except Su when being present among this base station BS2 ₂Outside scrambling code Su ₁Ability, to allow the soft handing-over of WTRU1, this network controller N then can receive the data-signal from base station BS1 and BS2, for the WTRU1 in SHO, when at least one group of data (that is, DATA _1AOr DATA _1A) when being received under the situation that does not have a CRC, then the error-free received data group can be used as data-signal DATA by network controller N system ₁And continue to be sent to this core network.

Claims (15)

1. a construction is to carry out the mobile wireless transmission/receiving element (WTRU) of radio communication with a network system with a plurality of base stations, wherein, this WTRU system is received in the communication data of optionally being encoded and transmitting in the pre-defined time news frame, and it comprises:

One contact detector receiver, it is construction in addition, receiving and to handle the multiple wireless signal in each of a series of times news frames, each the signal cording that is received in the scope with time slot altogether has the unique channel coding of one of same communicated data, and it comprises:

A plurality of channels are estimated device frequently, and its each is in addition construction, with this unique code based on this received signal, and produce a channel assessment of received signal respectively in altogether with the time slot scope; And

One colligator, it is construction in addition, to receive channel assessment from all these channel estimator, and be combined in altogether these channel assessments with each data-signal that is received in the time slot, and become a combined data signal, by this, common this communication data system of these a plurality of signals that received in this common time slot can be derived from this binding signal.

2. mobile wireless according to claim 1 transmits/picks the unit, it is characterized in that, more comprises a blind coding detecting unit, be used for will contiguous WTRUs spreading codes be restricted to only be can, or be better than the sign indicating number person that this WTRU has.

3. mobile wireless according to claim 2 transmits/picks the unit, it is characterized in that, these signals of communication are time division duplex code division multiple access (TDD-CDMA) kenel.

4. wireless communication system, it comprises:

One network element;

A plurality of base stations, it is to be connected to each other with this network element, each base station cording has a geographic service area;

One mobile wireless transmission/receiving element (WTRU), it is construction in addition, to carry out radio communication with these base stations, wherein, this WTRU system receives the communication data of optionally being encoded and transmitting from these base stations in predefined time news frame;

This WTRU cording has a contact detector receiver, it is construction in addition, with receive and handle in a series of times news frames each one or many communication datas transport wireless signal, wherein, the signal cording that is received in the scope that has altogether with time slot has the unique channel coding of one of same communicated data, and it comprises:

A plurality of channels are estimated device frequently, and its each is in addition construction, with this unique code based on this received signal, and produce a channel assessment of received signal respectively in altogether with the time slot scope; And

One colligator, it is construction in addition, to receive channel assessment from all these channel estimator, and be combined in altogether these channel assessments with each data-signal that is received in the time slot, and become a combined data signal, by this, common this communication data system of these a plurality of signals that received in this common time slot can be derived from this binding signal; And

This network element is construction in addition, among this geographical service scope that has been positioned at this selected base station based on this WTRU, and assigns selected base station, and then communication data is sent to this WTRU.

5. system according to claim 4 is characterized in that, these signals of communication are time division duplex code division multiple access (TDD-CDMA) kenel.

6. system according to claim 4, it is characterized in that, this WTRU lies on joining line and the downlink link channel, jointly communicate with first and second base station, upward each of joining line and downlink link channel is to transport to comprise preface in (midamble) sign indicating number sequence Mai, spreading codes Ci, and the data communication of scrambling code Si, and this data communication system is dispensed to one fen other base station uniquely by this network and WTRU is right, to distinguish out contiguous WTRUs and base station, and wrong circling round (convolutional) or turbine (turbo) coding of reducing, wherein, one first channel estimator is construction in addition, to respond preface sign indicating number sequence MA in one first ₁And produce one first channel assessment from this downlink link channel of this first base station, and one second channel estimator is in addition construction, to respond preface sign indicating number sequence MA in one second ₂And produce one second channel assessment from this downlink link channel of this second base station, this colligator further comprises:

One data assessment device, it is construction in addition, to receive these channel assessments, use relevant for one first spreading codes of this first base station and first scrambling code and use jointly detect relevant for one second spreading codes of this second base station and this first scrambling code be received from this first and the data of this second base station, and the data-signal of exporting a soft combination; And

One decoder, it is construction in addition, with circling round or turbine coding of the data-signal of deciphering this soft combination, so produce this first and this second base station one of transmit construction data-signal again.

7. system according to claim 6 is characterized in that, this second base station system communicates with a plurality of WTRUs and at least one mobile WTRU in soft handing-over, and this second base station comprises:

One contact detects receiver, and it comprises:

A plurality of channel estimator, it is in addition construction, with utilize should in preface sign indicating number sequence and handle respective uplink signals from each WTRU;

One data assessment device, be used for relevant be connected in this second base station carry out a plurality of scrambling codes of WTRUs of up link communication and spreading codes and handle these channel assessments; And

One decoder circles round or turbine coding in order to this of decoding data evaluator output signal, to be created in the data-signal of construction again that is transmitted in this up link communication.

8. system according to claim 7, it is characterized in that, should scrambling code separately be relevant one the 3rd scrambling code that is connected in this WTRU in soft handing-over, and be relevant one the 4th scrambling code that carries out the vicinity WTRUs of up link communication with this second base station that is connected in.

One kind with a mobile wireless transmission/receiving element (WTRU) carry out method of wireless communication, it is characterized in that, this mobile wireless transmission/receiving element (WTRU) is construction in addition, to carry out radio communication with a network system with a plurality of base stations, each base station cording has a geographic service area, wherein, this WTRU system is received in the communication data of optionally being encoded and transmitting in the pre-defined time news frame, and this method comprises:

Be positioned at this interior WTRU of this geographic service area scope of multiple base station;

Receive the wireless signal from each of this base stations in each of a series of times news frames, wherein, each the signal cording that is received in altogether with the time slot scope has the unique channel coding of one of same communicated data:

Based on this unique code of this received signal, and in altogether with the time slot scope, produce a channel assessment of each signal that has received respectively;

Be combined in altogether these channel assessments, to produce each combined data signal of time news frame respectively with each data-signal that is received in the time slot; And

From each respectively this binding signal of time news frame derive common this communication datas of these a plurality of signals that in each common time slot, received.

10. soft handover method, it is to be used among the cordless communication network, this cordless communication network system comprises a mobile wireless transmission/receiving element (WTRU), to carry out data communication with one first base station, and be to be positioned at from one second communication range to N base station, this method comprises the following steps:

This WTRU measures from the received signal sign indicating number power (RSCP) of each base station and measures;

This network is dispensed to a new base station with this WTRU, measures from the reception of this WTRU with response;

This new base station transmits identical network data to this WTRU simultaneously with this first base station in altogether with time slot;

This new base station and this first base station receive also demodulation simultaneously from the data of this WTRU, to handle by this network; And

Based on each base station known scramble and spreading codes, this WTRU system utilizes channel estimation device separately and jointly detects these communications from this first base station and this new base station, till extremely the soft handing-over of this new base station is finished.

11. method according to claim 10 is characterized in that, this base station lies on the beacon channel and broadcasts, and transmits data on a dedicated channel, and it more comprises the following steps:

This WTRU send on one joining line delivering power control (TPC) command signal to this first base station and this new base station both;

This network is adjusted the target SIR signal of this first base station and this new base station, to guarantee having at least one base station will receive an error-free information; And

This WTRU receives one first target SIR of this first base station and one second target SIR of this new base station.

12. method according to claim 11 is characterized in that, more comprises the following steps:

This WTRU cycles through each base station, periodically measures beacon channel power, and reading of data; And

This network system is assigned as all broadcasting time slots simultaneously and takes place, with the generation that do not conflict between the receiving broadcast signal of guaranteeing this beacon channel and the data from this dedicated channel of each base station.

13. method according to claim 10 is characterized in that, the softer handing-over to one of its communication range second section of this new base station this WTRU of execution of system from one of its communication range first section, and this method further comprises the following steps:

This WTRU measures from the received signal sign indicating number power (RSCP) of each base station section and measures;

This network is dispensed to this second base station section with this WTRU, measures from the reception of this WTRU with response;

This second base station section transmits identical network data to this WTRU simultaneously with this first base station section in altogether with time slot;

This base station jointly detect from this WTRU and by this first and this second base station section receive on joining line communication, soft combination and demodulation are from the data of this WTRU, to handle by this network; And

Based on each base station section known scramble and spreading codes, this WTRU system utilizes channel estimation device separately and jointly detects these communications from this first base station section and this second base station section, till finishing to the softer handing-over of this new base station.

14. method according to claim 13 is characterized in that, this base station lies on the beacon channel and broadcasts, and transmits data on a dedicated channel, and it more comprises the following steps:

This WTRU system sends joining line delivering power control (TPC) command signal on based on measured SIR;

This base station receives parallel TPC command signal in this first base station section and this second base station section, and soft combination and decipher these parallel TPC instructions is to produce the TPC instruction as a result of one of this network;

This WTRU receives and one of is adjusted and produce target SIR by this network, controlling the delivering power of this WTRU, this target SIR system from this first and this second base station section and by parallel this WTRU that is sent to; And

This WTRU adjusts its delivering power to the lowest power needs, to reach this target SIR.

15. method according to claim 14 is characterized in that, more comprises the following steps:

This WTRU cycles through each base station section, periodically measures beacon channel power, and reading of data; And

This network system is assigned as all broadcasting time slots simultaneously and takes place, with the generation that do not conflict between the receiving broadcast signal of guaranteeing this beacon channel and the data from this dedicated channel of each base station section.

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