CN101426208A - Method and system for organizing the cells of a wireless communication system and allocating resources to provide multimedia broadcast services - Google Patents

Abstract

A system and a method for installing the system are provided. The system can install a wireless multi-cell communication to provide multimedia broadcast services (MBMS) for a plurality of wireless transmission/receiving units (WTRUs). The cells of the communication system are built into a plurality of sets containing one or a plurality of cells. Resource units are assigned to each cell set of the communication system. The assigned resource units are allocated to each cell of the communication system for MBMS transmission. The WTRUs can receive information to indicate how to access the resource units that has allocated to the MBMS transmission. The WTRUs can receive the MBMS of one or a plurality of cells from the communication system.

Description

Organize wireless communication system cell and Resources allocation so that the method and system of MBMS service to be provided

Patent application of the present invention is that international application no is, international filing date is on December 23rd, 2003, the application number that advances the people China country stage is 200380108339.3, and denomination of invention is divided an application for the application for a patent for invention of " tissue wireless communication system cell and Resources allocation are to provide the method and system of MBMS service ".

Technical field

The present invention is widely relevant for a kind of radio communication.Particularly, The present invention be directed to and in a wireless communication system (such as time division duplex (TDD), frequency division duplexing (FDD), code division multiple access (CDMA) and/or global system for mobile communications (UMTS)), provide at least one or multinomial MBMS service (MBMS).

Background technology

In delivering the operation scheme of (Release) R99/R4 and R5, the UMTS standard summarizes out third generation partner program (3GPP) wideband CDMA (W-CDMA) system.This system uses TDD and fdd mode, and uses how common and exclusive channel to set up a communication link.These descending (DL) common channels comprise that main common controlled entity channel (P-CCPCH) that at least one comprises this BCH (broadcast channel) and/or at least one comprise the less important common controlled entity channel (S-CCPCH) of access channel (FACH) forward.

This communication link typically uses a wireless transmission/receive unit (WTRU) to set up.The device of subscriber unit, beeper or any other pattern that can under wireless environment, operate that WTRU comprises (but being the non-system of exceeding) user's device, mobile radio station, fixes or moves.These typical wireless environment patterns comprise (but being the non-system of exceeding) WLAN and public land mobile network.Can be in this described WTRU with timesharing pattern or frequency division pattern (such as being TDD and FDD distinctly) operation." base station " comprises (but being the non-system of exceeding) node B (Node B), platform controller (site controller), access site or other interface arrangement in wireless environment.

What known is that binding performance at the cell edge place of many cell wireless communication system is a thing of being concerned about for a long time, particularly concerning common channel.Link to analyze demonstrated the wireless WTRU on the cell edge can under a certain decline state, have greater than 10% or even higher Block Error Rate (block error rate) (BLER).In addition, for the optimization capacity, what want is that a S-CCPCH is set in same groove as P-CCPCH.

Provided and be MBMS by the network operator by the service of the special grade that S-CCPCH transmitted.In wireless communication system, use MBMS to come efficiently a common data, services to be disseminated to plurality of users.

MBMS is different with traditional point-to-point (PtP) service (such as voice or two-way video conference), and it is intended to receive the identical information that is transmitted by this network for a group user.Therefore, the realization of MBMS is different with the PtP service, and the latter transmits on the physical channel of user's special use usually, yet the former more is appropriate to transmit on the common physical channel that can be received by a plurality of WTRU.With regard to data rate, the demand of MBMS is changed in the scope of the highest about 100kbps, but concerning the demand of MBMS, the most general demand then is presented at the about 64kbps of each cell place, and has 90% user to be contained by MBMS in this cell.

In cdma system, provide the basic problem of MBMS to be, control unless use exclusive channel otherwise be difficult to allow this physical channel that carries MBMS accept power.Therefore, the essential transmission power of setting base station, so that in the group that this is served, the MBMS user who is positioned at the base station farthest can receive this physical channel quite reliably.In essence, this base station must be supported in the possibility of some user in this cell edge among N the MBMS user group, and therefore, this transmission power can be set according to user's needs.But concerning most user, this power is too big far away.This can produce asymmetric interference volume to other user in identical and neighbor cell.

With example this is illustrated, Primary Study to wideband W-CDMA FDD demonstrates, in order to reach in having the typical FDD cell of 64 kbps MBMS more than the containing of 90% WTRU, the typical case will need about 30% base station power to carry MBMS on this physical channel.Need it should be noted that equally the utmost point is difficult under the data rate that can keep the MBMS user of service at the cell edge place.

Therefore, required is to lower this large resource demand.For this purpose, the method that some can be used to lower the required power branch rate of MBMS has been discussed out, to improve the binding performance of this MBMS channel.These comprise: 1) than long interlocking, that is, contain the long Transmission Time Interval (TTI) of time diversity (diversity) preferably; 2) this MBMS channel is transmitted diversity; And 3) improve chnnel coding.Can use this technology will be used for supporting that the required FDD base station power branch rate of example of 64 kbps MBMS is reduced to about 10-20% from 30%.

Concerning the narrow frequency TDD of UMTS (NTDD) (1.28Mcps selection), by high interference degree that this MBMS produced can by physical channel time slot (timeslot) (TS) in exploitation frequency recycling and alleviating.This is feasible on principle, because the bandwidth of each NTDD carrier wave is less.For example, can in the 5MHz range assignment of FDD or wideband TDD (WTDD), support three narrowband carriers.

Use the method, some cell will be at special time slot (TS _n) in transmit MBMS, second group at TS with frequency f 1 _nIn but with frequency f 2 transmit and the 3rd group in TSn but transmit with frequency f 3.Because the distance between two base stations of carrying MBMS in identical TS with same frequency is longer, separate so can reach more space, therefore, can produce less interference to other cell from MBMS TS.But the operator must have these three kinds of obtainable frequencies in this spreading area.Lower the technology that transmits (Tx) power demand and comprise TTI length, soft handoff (soft handover) and the Tx diversity of for example using than length.

Owing to before global terrestrial radio had been accessed the discussion of (UTRA) FDD, it has indicated and can be reduced to the base station DL Tx power of some 15-20% downwards with reference to MBMS to support 64 kbps on S-CCPCH.

Previous system discloses one in the 5MHz bandwidth, in containing the LCR TDD system that 3 low chip rates (low chiprate) (LCR) are carried out in the spreading area of carrier wave based on R4, in this system, MBMS can be videoed on the S-CCPCH who is included in the single time slot, and this time slot is supposed one 3 the frequency recycling factor.These results demonstrate LCR TDD can provide the MBMS of the highest 64kbps under Block Error Rate=10% (BLER=10%); Or when in the S-CCPCH time slot, using full up base station Tx power, can be supported in BLER=1% about 16-32kbps down.

Moreover, reusing stating earlier in the communication system technology of the factor in the time domain (time-domain) of using 3, the cell in the 1st group will be at TS _nMiddle its MBMS that transmits, the cell in the 2nd group will be at TS _N+1The cell that middle its MBMS of transmission reaches in the 3rd group will be at TS _N+2Middle its MBMS that transmits.Cell in the 1st group is not with TS _N+1And TS _N+2Be used in any transmission (up (UL) and DL the two); Cell in the 2nd group is not with TS _nAnd TS _N+2Be used in any transmission or the like.The method with the MBMS block the duration irrelevant (that is, irrelevant) with its TTI mode operate.Each cell is the 170kbps/ cell with the average MBMS data rate that the method was produced, and the time slot efficient on MBMS TSs is 170kbps/3TSs=56kbps/TS in this system.

Fig. 1 demonstrates the employed typical data frame sequence of being mentioned by above-mentioned of the communication system technology of stating earlier (dataframe sequence), whereby a Frame is divided into TS1-15.Repeat these frames, and subsequently frame kept identical TS assignment, up to this TS through removing or through assignment especially again.Each time slot is the predetermined frame number of assignment one potentially.

Fig. 2 demonstrates the employed channel assignment figure of the communication system technology of stating earlier that is mentioned by above-mentioned.To give different time slots in the cell assignment on the same group not.When having overlapping coverage area and originate and transmit MBMS when broadcasting, can use this arrangement from a plurality of.

In order to illustrate, the coding that assignment one is consistent with cell in first group (group 1) is given the WTRUM1 in TS1.The coding that assignment one is consistent with cell in second group (group 2) is given the WTRU M2 in TS2, and the coding that assignment one is consistent with cell in the 3rd group (group 3) is to the WTRU M3 in TS3.This is apparent among the frame A, and repeat subsequently frame up to one or more assignments through changing.

Still refer to Fig. 2, in frame A78, these cells of organizing 1 are assigned to the first time slot group TS1.Remaining time slot TS ₂-TS _nThen can't help to organize 1 use.Organize 1 used physical channel and be assigned as whole S-CCPCH.The cell of these groups 2 is assigned to the second time slot group TS ₂Remaining time slot TS ₁And TS ₃-TS _nThen can't help to organize 2 uses.Organize 2 used physical channels and be assigned as whole S-CCPCH.The cell of these groups 3 is assigned to the 3rd time slot group TS ₃Remaining time slot TS ₁-TS ₂And TS ₄-TS _nThen can't help to organize 3 uses.Organize 3 used physical channels and be assigned as whole S-CCPCH.This pattern is recycled and reused for frame B 80, the time slot TS that will be consistent ₁-TS ₃Assignment gives these at the cell on the same group not.

Be noted that the above-mentioned shortcoming of mentioning of stating the communication system technology earlier is time slot TS ₁, TS ₂And TS ₃Can't be used in other transmission.Therefore, if when a time slot is used in cell in one group, then this time slot can't be organized cell by another and uses.What will want is to have the one group of TDD cell that can share time domain recycling pattern.

Concerning the radio resource that is fit to is used, the traceable effective MBMS user's quantity of global terrestrial radio access network (UTRAN).When initial in each cell, concerning each MBMS, this effective user's quantity can make and be used in each cell decision and can be applied to the transmission of this MBMS and the pattern of actual resource, and and stop this MBMS.

Owing to MBMS activates and user's migration service of setting up.Incorporate radio resource control (RRC) layer 3 into imagining the mechanism of following the trail of MBMS user, to send with MBMS " adding " (activating service) and to carry out the signal that cell upgrades, to keep these users' position.Along with these instruments know that user has activated this service and this service needs to scatter to that cell.

Because closed loop power control and the application that transmits diversity, when a kind of especially user's quantity of MBMS hour, exclusive channel is more efficient.When user's quantity increased, exclusive channel efficiency gain can't compensate duplicating of each data flow, so use can provide the common channel of single data flow to plurality of users.The method has been known as transmission/physical channel to be switched, and whenever can be applicable between the MBMS transmission period.

When using common channel, use the ARQ technology and guarantee that successful transmission is unactual.Therefore, can repeat each MBMS transmission to increase the probability of successfully transmitting.Chuan Shu number then can take into account the transmission that is applied to this service and the BLER that estimates of actual resource again.

MBMS can transmit for several times to guarantee successful transmission preferably.Chuan Shu number is relevant with the channel quality of expectation again.This number will consider that the poorest situation scheme is to reach a service quality (QoS) of estimating.One of this example is for being positioned at cell edge and result when a high BLER is arranged as the user.The user often will experience radio propagation state preferably, and will reach the transmission of success before transmission is finished again well.

Generally speaking, some improvement of wanting are for overcoming the shortcoming relevant with known MBMS.At first, needs one can be supported the new method of UMTS WTDD and NTDD, and it also can increase the capacity of the common channel that is used to provide MBMS.Secondly, want a workability to develop skill and improve the system of resource efficiency, one group of TDD cell can be installed whereby share time domain recycling pattern.The 3rd, no obvious service is transmitted sign and is existed, so any user who has activated MBMS will charge because of reception.Therefore, concerning UTRAN, that wants provides an enough number of transmission again to guarantee reliable reception.

Summary of the invention

The present invention can carry out in a wireless multi-cell communication system, and this communication system comprises the network that at least a and one or more WTRU communicate by letter.The MBMS of this communication system may command from network to this WTRU scatters.

In a specific embodiment, the distribution of MBMS can be carried out by following manner: the cell of this communication system is organized into a plurality of groups that contain one or more cells, gives each the cell group in this communication system with the Resource Unit assignment and these are transmitted in order to MBMS in resource unit allocation each cell in this communication system of assignment.These WTRU can receive information and indicate how access these have divided the Resource Unit that is used in the MBMS transmission, and these WTRU can receive the MBMS from one or more cells of this communication system.

Before carrying out the program of foregoing description, can set up the MBMS demand to this communication system, and can determine and to be used for each can obtain to be used for the cell of MBMS in this communication system Resource Unit.When on the MBMS demand, changing to some extent or MBMS demand can't satisfy the time, can repeat this program.

This communication system can be a FDD communication system, can use multiframe to distribute whereby.Can set up a repetition period to the whole cells in this communication system.Moreover, can in each repetition period, set up inferior group of frame of desiring to be used in the MBMS transmission to each cell group.

Whether this communication system can be a TDD communication system, can determine can use in this communication system multiframe to distribute whereby.When determining in this TDD communication system, to use multiframe to divide timing, can set up a repetition period to the whole cells in this communication system.Moreover, can in each repetition period, set up inferior group of frame of desiring to be used in the MBMS transmission to each cell group.When determining not use multiframe to divide timing, can provide different time slot combinations to each cell group, wherein in each frame, use identical time slot combination.

Description of drawings

Fig. 1 illustrates a priority of use and states typical sequence of data frames in the communication system technology, and one of them frame comprises 15 time slots;

Fig. 2 demonstrates a priority of use and states channel assignment figure in the communication system technology, wherein to using unique time slot at the cell on the same group not;

Fig. 3 is according to a specific embodiment of the present invention, in TDD or FDD wireless multi-cell communication system with the flow chart of MBMS service assignment to cell;

Fig. 4 is an instance graph of carrying out the time domain recycling in the TDD communication system, wherein shares a time slot at the cell on the same group not with the cell in other group, but can be according to the present invention with the time slot applied in any combination of uniqueness at the cell on the same group not;

Fig. 5 is the example of an execution time domain recycling in the FDD system, wherein used according to the invention one overlapping assignment;

Fig. 6 is the calcspar of a communication system (TDD or FDD), and it can carry out the MBMS oos service by a specific embodiment according to the present invention, switches and end of service with control transmission/physical channel;

Fig. 7 is the calcspar of a communication system (TDD or FDD), and it can carry out a cell refresh routine by a specific embodiment according to the present invention, with control MBMS service transmission;

Fig. 8 is the calcspar of a communication system, and it can carry out delivery confirmation to lower the MBMS transmission by a specific embodiment according to the present invention; And

Fig. 9 is the calcspar of a system, and it can be cut apart by specific embodiment execution MBMS according to the present invention.

Embodiment

Can understand the present invention in more detail by the preferred embodiment of following description, it furnishes an explanation with example and accompanying drawing that can associated is understood.

The present invention will describe with reference to the accompanying drawings, and wherein identical label is represented components identical.

Though the present invention describes with the TDD of associated and the wireless communication system of FDD pattern, the important the present invention of being noted that can carry out in the wireless communication system of any pattern, comprises TD-SCDMA and CDMA2000.

Fig. 3 is the flow chart according to a specific embodiment of the present invention, and it demonstrates to be carried out by program 300 and is used for MBMS (for example, UTRAN) is disseminated to the step of one or more WTRU from the network of a wireless multi-cell TDD or FDD communication system.In step 305, which kind of MBMS decision need set up to this communication system.These MBMS demand definables go out channel allocation parameter specification, such as data rate, target BLER, TTI and/or minimum user's quantity or its analog.

In step 310, the required Resource Unit of each cell in communication system can determine according to its availability of desiring to be dispensed to this MBMS.Concerning the TDD communication system, this Resource Unit can comprise some by a particular carrier wave frequency, scrambler, a selectable channelization code and the defined physical channel of a frame group.As being indicated in detail by TS25.221, the physical channel in TDD is a kind of burst, and it can transmit with special time slot in the radio frame through distributing.This distribution can be continuous (that is, will be dispensed to this physical channel at the time slot in each frame), continuous between maybe this distribution can be (that is, only being distributed in the time slot in time group of whole frames).Concerning the FDD communication system, these Resource Units can comprise some by a particular carrier wave frequency, scrambler, initial and defined physical channel of termination time duration that a selectable channelization code and being used to provide.In step 315, these cells are organized into a plurality of groups (that is, the group) that contain one or more cells, to guarantee MBMS to a certain degree.In step 320, give each cell group in this communication system with these Resource Unit assignments.

In step 325, when carrying out program 300, then in step 335, use multiframe to distribute as if use FDD communication system.If when selecting the TDD communication system to carry out program 300, whether decision uses multiframe to distribute in step 330.The use that multiframe is distributed can be the basis in the separated by spaces between these cells (that is distance).When using multiframe to divide timing in FDD communication system (step 335) or in TDD communication system (as pointing out) by " agreement " output of step 330, can be minimized in the interference in this communication system, so can guarantee certain MBMS service routine (step 340) by whole cells being set up a repetition period and each cell group is set up inferior group of frame of desiring to be used in the MBMS transmission in each repetition period.If in this TDD communication system, determined not use multiframe to divide timing, then provide different TS combinations, and in each frame, use identical TS combination (step 345) each cell group.Will be appreciated that and to go on foot the decision of execution in step 330 relatively independently of one another or with any one of previous steps 305,310,315,320.

In step 350, this is transmitted in order to MBMS in resource unit allocation each cell in this communication system of assignment.In step 355, these have divided the Resource Unit that is used in the MBMS transmission to these WTRU accessible informations to indicate how access.In step 360, these WTRU can receive the MBMS from one or more cells.In step 365, determine whether these determined MBMS demands in step 305 do not change or still satisfy.Do not reach when still satisfying if these MBMS demands have changed, program 300 can be back to the step 360 that WTRU continues to receive MBMS.If these MBMS demands have changed or do not satisfy, then program 300 can be back to step 305 place of the beginning of program 300, so can set up new MBMS demand.

According to the present invention, use time slot to manage the interference of lowering between cell, whereby the time slot assignment is given special frame and give cell with good mode assignment frame.This time slot management allows each the cell group in a cell group is kept optimal power.Concerning TDD, the WTRU that the management of this time slot can guarantee to receive the DL signal can experience the least interference of other cell in comfortable these time slots.They can successfully decipher the DL data that received on these channels, minimize transmission requirements again and guarantee to contain high data rate on these channels in this cell areas.This can be by coming assignment to give WTRU and reach in the mode that the cell group is divided into several groups and each cell group and has a time slot assigned group of a uniqueness channel assignment and time slot.

The present invention can have plurality of cells one and carry out time domain recycling pattern in the wireless communication system of supporting the MBMS service.This time domain recycling and frequency recycling are identical to the influence that improves receiving quality.According to the present invention, this time domain recycling pattern can assure that some cell in the TDD spreading area will transmit its MBMS service in some time slot, and it will stay and not used by other cell.

TDD viewpoint of the present invention can be applied to known at UMTS TDD R99 (3.84Mcps and 1.28Mcps select) and the S-CCPCH more backward or the example of DL shared channel, it is with irrelevant by the certain content (such as MBMS) of its transmission, and still the reliable service to MBMS then is considered as very important special example.Even there are not MBMS, technology of the present invention will improve in the data rate at cell edge place and attainable containing.For loss of generality not, then consider the example of the MBMS that on S-CCPCH, carries; Even the feasibility of this method can be extended to the service of any kind of of carrying at the common channel of any DL (such as the DL shared channel) in form.Then the two common channel of DL that adopts another kind of pattern is (that is, HS-DSCH) to FDD and TDD for R5.

The influence of carrying out channel assignment technology of the present invention can be illustrated by the result from WTDD emulation.In DL, each WTRU can carry its data with 16 spreading codes of SF=16 and reach near the data rate of 2Mbps by each filling in 12 DL time slots.If continuously when carrying each frame, use the single time slot of whole 16 SF=16 spreading codes can therefore produce the data rate of about 170kbps.In following whole example, the time slot assignment that can suppose simply 1 of each frame is filled up is to this S-CCPCH or equally to this MBMS.Similarly, suppose that each groove is 170kbps.

According to the present invention, but come these time slots of assignment in the mode of lessen any interference when broadcasting MBMS broadcasting and other broadcasting (its when can in overlapping coverage area, take place).These time slots can reuse in these cells according to the demand of MBMS.This can with the MBMS block the duration irrelevant and carry out with the irrelevant mode of TTI.

According to the present invention, when using by whole cells, then can successfully develop and use multiframe to distribute and TTI as if identical TS.In each pre-grouping of cell group, give unique S-CCPCH group with the cell assignment in every group.

According to the present invention, can reuse possible time slot combination according to its repetition period.This can set up time domain recycling pattern.If when identical TS desires to be used by whole cell, then can successfully develop and use multiframe to distribute and TTI.Along with each MBMS block TTI=20 millisecond (2 frames), the repetition period (8 frame) that the S-CCPCH of each cell can 80 milliseconds distributes.

The first cell group will transmit its MBMS with a time slot n who provides in frame m and m+1, and frame m+2 ..., will not transmit anything among the m+7 with time slot n.The second cell group will transmit its MBMS with identical time slot n, but be in frame m+2 and m+3, but frame m, m+1 and m+4 ..., do not transmit anything among the m+7 with time slot n.The 3rd cell group will transmit its MBMS with identical time slot n, but be in frame m+4 and m+5, but frame m ..., m+3 and m+6 ..., do not transmit anything among the m+7 with time slot n.At last, the 4th cell group will transmit its MBMS with still identical time slot n in frame m+6 and m+7, but frame m ..., do not have things among the m+5.

Each cell is the 170kbps/4=42kbps/ cell with the average MBMS data rate that the method was produced, and the MBMS TSs efficient in this system is 170kbps/1TS=170kbps/TS.This system will experience effective time domain recycling factor and in fact noiseless on MBMS TSs of 4.Under tabulate in 1 " n " representative " carries a cell that carries the S-CCPCH of MBMS with time slot n in this frame ".Nothing " n " is meaning this cell and do not carrying things in this time slot n of this frame.

Table 1

Frame number	m	m+1	m+2	m+3	m+4	m+5	m+6	m+7
									Cell in group 1	n	n
Cell in group 2			n	n
									Cell in group 3					n	n

Cell in group 4

n

n

But this program inference is to other possible combination, as 1MBMS TS, 40 milliseconds of repetition periods and TTI=10 millisecond; Or 1MBMS TS, 160 milliseconds of repetition periods and TTI=40 millisecond.

Be noted that formerly to state and use 3 the time domain recycling factor in the communication system technology often, it can be the selection of a high attraction.Can this notion reach in this by 60 milliseconds of use repetition periods and TTI=20 millisecond.From the viewpoint of physical layer, this is a flat-footed variation.This higher level protocol is had a less revision, its only support now 10,20,40,80,160,320 and 640 milliseconds through the standardized repetition period.This time domain recycling pattern will produce the average MBMS data rate of every cell 170kbps/3=56kbps/ cell potentially.Along with this program, only need " sky " TS to hold MBMS.

According to the present invention, be accompanied by the potentiality of 170/2=85kbps, can reach 2 time domain recycling.When if identical single TS is used in MBMS by whole cells, then, can successfully develops and use multiframe to distribute and TTI along with 40 milliseconds repetition period (still changing the TTI of each cell group).In following table 2, ' n ' represents one to carry a cell group of carrying the S-CCPCH of MBMS in the time slot n of this frame.Not having ' n ' meaning this cell group and do not carrying things in this time slot n of this frame.

Table 2

Number of frames	m	m+1	m+2	m+4
					Cell in group 1	n	n
Cell in group 2			n	n
					Cell in group 3		n	n
Cell in group 4	n			n
					Cell in group 5	n		n
Cell in group 6		n		n

Be noted that at the cell of group among the 1-4 and allow TTI=20 millisecond (divide timing, can parameter is reached by using " compensation ") when carrying out these multiframes.Should not support with two succeeding vat transmission at the cell in the group 5 and 6.As a result, will be at the TSs of the one-tenth of the cell assignment in the group 5 and 6 through time-division.What can see is that each cell group has at least one and there is no groove from the interference between the cell of any special other group.Moreover, can operate three pairs of groups that there is no inter-cell interference each other:

(1) group 1 and organize 2;

(2) group 3 and organize 4; And

(3) group 5 and organize 6.

The superfluous position of utilization in preposition error correction (FEC) can successfully be operated on most scope, can support the highest 85kbps and each frame only to need a time slot simultaneously.

Node B synchronously (Node B sync) can handle by the use branch rate of these time slots of assignment.In the method, can use burst isochronous to support that node B is synchronous.The method is got rid of when use is stated technical method earlier originally, will prevent reliable detection because be concerned about annoyance level.But along with the present invention, during the time slot that this cell does not transmit, the burst isochronous that a present cell is heard neighbor cell is more feasible.

Fig. 4 is the channel assignment figure of use in the TDD communication system, its multiframe assignment used according to the invention.Fig. 4 provide one use assignment to the different TSs and frame of cell the two combination carry out the example that time domain reuses.This modified technology can overlapping assignment.In each pre-grouping of cell group, unique S-CCPCH group is given in the cell assignment in each group.But, being unlike among Fig. 2 like that, it is one overlapping that the present invention manifests between group S-CCPCH.

As shown in Fig. 4, the cell of group 1 is at each frame middle finger dispensing first time slot group TS ₁, TS ₂Remaining time slot TS ₃-TS _nThen can't help to organize 1 uses.The physical channel of group 1 is assigned as whole S-CCPCH.The cell of group 2 is at each frame middle finger dispensing second time slot group TS ₃, TS ₄Remaining time slot TS ₁-TS ₂And TS ₅-TS _nCan't help to organize 2 uses.The physical channel of group 2 is assigned as whole S-CCPCH.The cell of group 3 is at each frame middle finger dispensing the 3rd time slot group TS ₂And TS ₃Remaining time slot TS ₁And TS ₄-TS _nCan't help to organize 3 uses.The physical channel of group 3 is assigned as whole S-CCPCH.The time slot that group 3 is given in assignment and assignment are given and are organized 1 and to organize 2 time slot overlapping.

Still refer to Fig. 4, it shows in the frame that provides brings an overlapping time slot and the time-division of a time slot in the group 4,5 and 6 into.The cell of group 4 is at each frame middle finger dispensing the 4th time slot group TS ₁, TS ₄Remaining time slot TS ₂-TS ₃And TS ₅-TS _nCan't help to organize 4 uses.The physical channel of group 4 is assigned as whole S-CCPCH.The cell of group 5 is at each frame middle finger dispensing the 5th time slot group TS ₁And TS ₃Remaining time slot TS ₁And TS ₄-TS _nCan't help to organize 5 uses.The physical channel of group 5 is assigned as whole S-CCPCH.The cell of group 6 is at each frame middle finger dispensing the 6th time slot group TS ₂And TS ₄Remaining time slot TS ₁, TS ₃And TS ₅-TS _nCan't help to organize 6 uses.The physical channel of group 6 is assigned as whole S-CCPCH.One or more time slot of these groups can be overlapping with the time slot of other group.For example, the time slot TS of group 1 is given in assignment ₁Can give the time slot TS of group 4 with assignment ₁And the TS of group 5 is given in assignment ₁Overlapping.Similarly, the time slot TS of group 1 is given in assignment ₂Can give the time slot TS of group 3 with assignment ₂And the time slot TS of group 6 is given in assignment ₂Overlapping.Between any two cell groups, there is no the time slot group of phase negative lap, so each cell group has its own uniqueness and its time slot combination is given in assignment.

During these time slots, allow communication and assignment overlapping to the time slot and the frame of plurality of cells group.These are combined as so so that between any two cell groups, there is no the time slot or the frame group of phase negative lap, this its own uniqueness of each cell group can be provided and assignment to its time slot and frame combination.

Fig. 5 demonstrates one and carry out the example that time domain reuses in the FDD system, and wherein the multiframe of this TDD system distributes (as being presented at Fig. 4) can be extended to FDD.Fig. 5 one demonstrates the time-domain diagram that frame distributes, and wherein each the cell group in the pre-grouping of cell group is used identical S-CCPCH.Channel assignment described in Fig. 4 is subject to special frame concerning each cell group.But the S-CCPCH of each group uses the frame of sharing.This assignment can be applied to whole cell groups, but in the pre-grouping of this cell group, unique S-CCPCH group is given in the cell assignment in each group.This modified technology can the overlapping frame assignment.This is restricted in the pre-grouping of this cell group, and unique S-CCPCH group is given in the cell assignment in each group, and has overlapping between the S-CCPCH group.

Refer to Fig. 5, the first frame group that is consistent with frame 101 and 102 is given in the cell assignment of group 1.Remaining frame 103A and 103B can't help to organize 1 and use.The physical channel assignment 105 of group 1 is whole S-CCPCH.The second frame group that is consistent with frame 111 and 112 is given in the cell assignment of group 2.Remaining frame 113A and 113B can't help to organize 2 and use.The physical channel assignment 115 of group 2 is whole S-CCPCH.The 3rd frame group that is consistent with frame 121 and frame 122 is given in the cell assignment of group 3.Remaining frame 123A and 123B can't help to organize 3 and use.The physical channel assignment 125 of group 3 is whole S-CCPCH.

Refer to Fig. 5, overlapping the bringing into of the assignment of adopting organized in 4,5 and 6.As seeing in Fig. 5, the 4th frame group that is consistent with frame 131 and 132 is given in the cell assignment of group 4.Remaining frame 133A and 133B can't help to organize 4 and use.The physical channel assignment 135 of group 4 is whole S-CCPCH.The 5th frame group that is consistent with frame 141 and 142 is given in the cell assignment of group 5.Remaining frame 143A and 143B can't help to organize 5 and use.The physical channel assignment 145 of group 5 is whole S-CCPCH.The 6th frame group that is consistent with frame 151 and 152 is given in the cell assignment of group 6.Remaining frame 153A and 153B can't help to organize 6 and use.The physical channel assignment 155 of group 6 is whole S-CCPCH.

In these image durations, allow communication and assignment overlapping to the frame of plurality of cells group.These are combined as so so that between any two cell groups, there is no the frame group of phase negative lap, this its own uniqueness of each cell group can be provided and assignment to its frame combination.

Refer to Fig. 5, be used for allowing for TTI=20 millisecond (it can be reached by setting this S-CCPCH with correct SFN) at the FDD channel assignment of the cell of organizing 1-4.FDD allows to be used for asynchronous cell operation usually, and uses asynchronous cell operation can make channel assignment of the present invention more easily handle in time.Cell in group 5 and 6 need use the TTI=10 millisecond.

According to the present invention, provide a time domain that is used for the FDD transmission to reuse the factor.Introduce this time domain recycling factor and be used for the common channel of DL, particular importance concerning the situation (such as the MBMS on S-CCPCH or DL shared channel) of sharing transmission.This principle is similar to the time domain of use at TDD, but has continuous transmission but not each frame one special TS (as in TDD) in special frame.

In FDD, because in special frame, need the transmission of continuous S-CCPCH or DSCH Downlink Shared Channel (DL DSCH) but not as each frame one special TS as in TDD, so can not be as expansion straight from the shoulder as the known program (technology of stating earlier of the identical TDD of equaling).

Even be not present in FDD as the multiframe that the equates distribution as in TDD, can reach by continuous (that is, each frame) this channel of assignment equally, if not still this base station is wanted, then in some special frame, do not carry it.This S-CCPCH does not need to comprise the guiding position, because this P-CCPCH adopts usually as the phase reference, and does not need to carry other control bit (as TFCI) when free of data exists.Therefore, in these unloaded cycles, there is no need to transmit anything.Use with the related different channels assignment of P-CCPCH channel assignment the one TDD technology that equates to be used in FDD can be provided.

The present invention can be according to 3GPP W-CDM communication system, and service regeulations and high-speed downlink grouped access (HSDPA) transmission and use voice and data.This 3GPP system only can use as an example and the present invention can be applied to other code division multiple access communication system.Also be noted that FDD of the present invention part can be applied at UMTS FDDR99 and the known S-CCPCHS or the example of DL shared channel in (for example, HS-DSCH is at R5) more backward, and irrelevant with specific content.

According to the present invention, what need know is when the user stops this service or when successfully receive this service, gives the entity of MBMS and transmits resource to discharge assignment efficiently.The obvious MBMS revocation information that the user produced can make and be used for lowering the MBMS transmission.This can be a L3RRC program or a NAS sends signal procedure.After receiving this revocation information, user's MBMS content can remove from relevant with special MBMS now validated user.

Refer to Fig. 6, use an activation/cancelling method in wireless multi-cell communication system 600, it comprises a plurality of and WTRUs 605 UTRAN 610 communications, is used for the number of transmission demand again of special MBMS with control.

Cancel can be used in to transmit and switch, with user (WTRUs) quantity that determines to receive now this MBMS, but the channel of this communication system 600 of recombinant like this is so that there is preferable performance.Moreover, can lower this and transmit quantity again.

In a specific embodiment, the WTRUs 605 of Fig. 6 operates under one of this communication system 600 specific cell, and it can activate this MBMS.This UTRAN 610 can determine WTRUs 605 quantity of operating in the particular cell that can activate MBMS.This UTRAN 610 can be according to determined WTRUs 605 quantity with resource allocation to specific cell.This UTRAN 610 uses this resource through distributing that MBMS is disseminated to WTRUs 605.This UTRAN 610 can stop MBMS and the resource of this UTRAN 610 that can reallocate at WTRUs 605 places when whole WTRUs 605 cancels MBMS.

Be as the criterion with effective number of users, UTRAN 610 can install transmit and physical channel to reach maximum radio resource efficiency.Can use this MBMS cancel message information as an obvious sign, this can lower user number counting concerning each by the service that the user underwrote.When the number of users of special service arrives preestablished limit, can carry out this transmission/physical channel and switch.When whole users had cancelled, this MBMS transmission meeting stopped in this cell.

In step 615, the user can send signal by UTRAN 610 its WTRUs 605 and activate MBMS.This MBMS can be disseminated to WTRUs 605 (step 620) by UTRAN 610.When the user removed (step 625,635) from effective user of those MBMS, this UTRAN 610 can arouse MBMS transmission/physical channel and switches (step 630) or can scatter this service (step 640) discontinuously in this cell as a result.

Refer to Fig. 7, the cell refresh routine of this existence also can make and be used for activating and cancel the MBMS transmission.This also can be installed makes and is used for the cell refresh routine of track user migration in order to be updated periodically.At user's MBMS (step 700) after activating, and because this effective MBMS user knows, this cell refresh routine can be carried out on periodic basis with the decision user and when move to new cell or can't reach (step 705) by UTRAN 610, and so MBMS is spreadable to WTRUs 605 (step 710).When this cell refresh routine demonstrates that this WTRU 605 has moved to a new cell or is no longer received by UTRAN 610 about periodically updating of these users (step 715), therefore this user MBMS content can cause this MBMS of termination to transmit (step 720) from removing now with in special MBMS is relevant this cell the validated user.

In a specific embodiment, at least one of the WTRUs 605 of Fig. 7 can activate this MBMS.This WTRU 605 can provide the renewal of one-period property to this network, and this can indicate first cell of the communication system that WTRU 605 operates therein.This UTRAN 610 can be disseminated to this WTRU 605 with MBMS.When this WTRU605 stop to provide periodically update or its when in this communication system cell different, operating with first cell, this UTRAN 610 can stop this MBMS at WTRU 605 places.

Fig. 8 demonstrates a wireless communication system 800, and it comprises WTRUs 805 a plurality of and a UTRAN 810 and a core network (CN) 815 communications.System 800 can provide MBMS announcement and selectable delivery confirmation (step 820).Concerning (billing) purpose of checking, be disseminated to WTRUs 805 backs (step 825) at MBMS, report to the further MBMS delivery confirmation (step 830) of UTRAN 810 scalable by WTRUs 805 to CN 815 (step 835).Sending signal then can send by UTRAN 810 and determine that information is to WTRU 805, produce new information or the non-layer node B applying portion (NAS) that access directly sends signal from WTRU 805 and reach to CN 815 by UTRAN 810.After receiving, to the transmission of each WTRU 805 record MBMS by CN 815.This confirmation can be L3 radio resource control (RRC) or NAS sends signal message.UTRAN810 can follow the trail of affirmation to each user who activates those MBMS.In case the validated user of whole or predetermined percentage has been confirmed to transmit, then can stop this and transmit (step 840) again.Maximum also can be installed transmit counting again, so that radio resource limitations is used at special MBMS.

In a specific embodiment, the UTRAN 810 of Fig. 8 can be disseminated to MBMS at least one of WTRUs 805 by a plurality of MBMS transfer of data of transmission.This WTRU 805 can indicate whole MBMS transfer of data to this UTRAN 810 and receive.Then, this UTRAN 810 can stop this MBMS transfer of data.

Service is confirmed and can't always be confirmed.For example, the each transmission of some service has data very slightly.Therefore, the cost of transmission is very little again.Allow to be used for this further optimized one and be chosen as during this active program, to identify which kind of service reception acknowledge.

The method that other MBMS that can succeed along with transmitting again of attenuating transmits is the data segment out of the ordinary that receives and store from each transmission, transmits next the transmission up to this MBMS service in conjunction with these blocks again from each then and finishes.This MBMS transmission comprises some data segments, its each comprise one or more making and be used for confirming the Cyclical Redundancy Checks (CRCs) that success is transmitted.

MBMS is cut apart and can be carried out by the wireless communication system 900 that is presented at Fig. 9.System 900 comprises the WTRU 905 of at least one and UTRAN 910 communications.Receiving MBMS transmission back (step 915), WTRU 905 can store all the data segment (step 920,925) that success receives.WTRU 905 can use MBMS information come in a planned way only to receive those formerly transmit in the data segment (for example, the 2nd section) (step 930) that receives of success, but not receive whole transmission.Therefore, can lower WTRU handles and power consumption.Extraly, can lower and be used for success and transmit required transmission quantity, because it only needs in a planned way to receive those sections of receiving of success as yet, and the whole MBMS of unplanned reception transmits.This MBMS is cut apart and can be lowered MBMS and transmit quantity again or stop this quantity, and determines information irrelevant (step 935) with being transmitted by the selectivity MBMS that the user produced.

In a specific embodiment, the UTRAN 910 of Fig. 9 can be divided into this MBMS a plurality of each other data segment, and each MBMS data segment can be sent to WTRU 905.Each MBMS data segment that this WTRU 905 can have been received by WTRU 905 suitably is stored in the memory (not to be had and shows).WTRU 905 can identify the MBMS data segment that at least one is not received suitably by WTRU 905 to UTRAN 910.This UTRAN 910 only can transmit the MBMS data segment that identified again to WTRU 905.

Before transmitting these MBMS data segments, UTRAN 910 can indicate when each MBMS data segment can be transferred into WTRU 905 and how many data segments this MBMS comprises to WTRU 905.Each MBMS data segment can comprise at least one makes the Cyclical Redundancy Checks (CRC) that are used for confirming that the MBMS data segment has been transmitted by these WTRU 905 successes.The operator of UTRAN 910 can determine whether this WTRU 905 has received whole MBMS data segments, checks so that promote.

In another specific embodiment, this UTRAN 910 can be divided into this MBMS a plurality of each other MBMS data segment, and plans to be sent to WTRU 905 in the different time.WTRU 905 is indicated this different planned time in these UTRAN 910 meetings and how many data segments this MBMS comprises.This UTRAN 910 can be sent to WTRU 905 with these MBMS data segments when different planned times.This WTRU 905 can activate receiver (do not have and show) therein when different planned times, to receive the MBMS data segment that is transmitted by UTRAN 910.This WTRU 905 can identify the MBMS data segment that at least one is not received suitably by WTRU 905 to UTRAN 910.When this data segment through differentiating was desired to transfer to WTRU 905 again, this UTRAN 910 can indicate once the time of distributing WTRU 905.UTRAN 910 only can transmit this MBMS data segment through differentiating again to WTRU.This WTRU 905 can activate receiver therein at this time place through distributing, to receive the MBMS data segment that this transmits again.

Though the present invention is along with showing especially with reference to preferable specific embodiment and describe out, will be appreciated that by the personage who knows this technology can on form and details, make different changes and do not leave the aforesaid scope of the present invention.

Claims (2)

1. method that MBMS service (MBMS) is provided, this method comprises:

A plurality of radio communication cells are organized into a plurality of cell groups that comprise one or more neighbor cell;

Whether decision uses multiframe to distribute; And

When decision does not use multiframe to divide timing, provide different time slot combinations to each cell group, wherein in each frame, use identical time slot combination.

2. Wireless Telecom Equipment, it is installed MBMS service (MBMS), this Wireless Telecom Equipment are provided is to be used to carry out:

A plurality of radio communication cells are organized into a plurality of cell groups that comprise one or more neighbor cell;

Whether decision uses multiframe to distribute; And

When decision does not use multiframe to divide timing, provide different time slot combinations to each cell group, wherein in each frame, use identical time slot combination.

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