CN101084682A - Method for rate control signaling to facilitate ue uplink data transfer - Google Patents

Abstract

Embodiments described herein address the desire to have a method for uplink rate control signaling that is able to achieve increased sector and user throughput with relatively high uplink spectrum efficiency. Rate control signaling embodiments are disclosed that use two common persistence values ( 404, 408 ) to update the allocated portion of RoT margin for each UE device, and thus, reduce the variation of the RoT. In addition, SHO information is used to control the inter-sector/cell interference and improve the sector throughput. In such embodiments, each UE determines ( 412 ) the data rate and time to transmit according to these common persistence values, SHO status and buffered data. Throughput comparable to that of time and rate schedulers, which require significantly more signaling and information, can be achieved by some of these embodiments while also exhibiting less sensitivity to delay, speed of the UE, and burstiness of the traffic.

Description

Be used for rate control signaling to promote the method for UE uplink data transmission

With reference to relevant application

The sequence number of the application's request in May, 2004 submission is the priority of the provisional application of No.60/568199, exercise question is " METHOD FOR RATE CONTROL SIGNALING TOFACILITATE UE UPLINK DATA TRANSFER ", and its content is incorporated into here as a reference.

The pending application of the application about submitting on the same day, exercise question is " METHOD FORACK/NACK SIGNALING TO FACILIATATE UE UPLINK DATATRANSFER ", this application transfer gives the application's assignee, thereby is incorporated herein by reference.

The sequence number that the application submitted to about on April 30th, 2003 is the pending application of No.10/427361, exercise question is " ENHANCED UPLINK RATE SELECTION BY ACOMMUNICATION DEVICE DURING SOFT HANDOFF ", and this application transfer gives the application's assignee.

Technical field

The application is usually directed to wireless communication system, especially, relates to the rate control signaling that promotes the UE uplink data transmission.

Background technology

In universal mobile telecommunications system (UMTS), next third generation partner program (3GPP) standard that is used for UMTS grounding wireless access network (UTRAN) that is for example proposed, for example broadband CDMA system (WCDMA) or cdma2000, for example and be distributed in any one of a plurality of base station sub-systems (BSS) in the geographic region or the subscriber equipment (UE) of a plurality of travelling carriage that communicates (MS).Usually, BBS (being the Node B among the WCDMA) service is divided into the area of coverage of a plurality of sectors (being the sub-district among the WCDMA).And each sector is all by one or more service that is included in a plurality of base transceiver stations (BTS) among the BSS.Travelling carriage is cellular communication apparatus normally.Each BTS is the transmitting down link pilot signal continuously.MS monitors the energy of this pilot tone and the frequency pilot sign that measurement received.

In general cellular system, the communication between MS and the BSS exists various states and channel.For example, at IS95, in the control of travelling carriage on service condition, BSS communicates by forward traffic channel in the forward link and MS and MS communicates by reverse traffic channel in the reverse link and BSS.During conversing, MS must often monitor and safeguard four pilot sets.These four pilot sets are called pilot set jointly and comprise Active Set, Candidate Set, and Neighbor Set and residual set wherein, although this term may be different, are applied to the WCDMA system with identical notion usually.

Active Set comprises the pilot tone relevant with the forward traffic channel of distributing to MS.This collection activates, because the pilot tone relevant with this collection all made up and demodulation by MS effectively with the data symbol of following.Candidate Set comprise current be not present in the Active Set but received by enough intensity by MS represent that the forward traffic channel of being correlated with can be successfully by the pilot tone of demodulation.Neighbor Set comprises and currently is not present in Active Set or the Candidate Set but may is the alternative pilot tone that is used to switch.Residual set comprises except Candidate Set, beyond the pilot tone in Neighbor Set and the residual set, in the current system on the current Frequency Distribution the pilot tone that might exist.

When MS was received by first BTS, MS constantly searched for the pilot channel of adjacent BTS, to find the pilot signal enough stronger than threshold value.MS adopts Pilot Strength Measurement Message that this incident is sent to first serving BTS.When MS when shifting to second sector by the 2nd RTS service by first sector of BTS service, this communication system rises to some pilot signal Active Set and rises to Candidate Set from Neighbor Set from Candidate Set.Serving BTS is notified this lifting by hand off direction message to MS.Then, because MS is stopping and just beginning to communicate by letter with the new BTS that is added into Active Set before old BTS communicates by letter, therefore " soft handover " will take place.

For reverse link, each frame or grouping that the common demodulation sign indicating number independently of each BTS in the Active Set receives from MS.Make arbitration by switching center that is arranged in base station controller (BSC) or selection allocation units (SDU) between each BTS decoded frame then, base station controller (BSC) is also referred to as the radio network controller (RNC) in the WCDMA term.This operating in soft handover has lot of advantages.Qualitatively, when the user shifted to contiguous sector from a sector, more reliable switching is improved and provided to this specific character between BTS.In quantity, soft handover has improved the capacity/coverage in the cellular system.Yet the increase along with data transmit (bandwidth) request quantity can go wrong.

Multiple third generation standard occurred, it attempts satisfying the anticipated demand that increases data transmission rate.At least the synchronous communication between some back-up system unit of these standards, and at least some other standards support asynchronous communications.Support at least one example of synchronous communication standard to comprise cdma2000.Support at least one example of asynchronous communication standard to comprise WCDMA.

Although the system of support synchronous communication can reduce search time of switching search and the time of improving validity and reducing location positioning calculating sometimes, support the system of synchronous communication to require the base station time synchronized usually.Be used for a kind of commonsense method that synchronising base station adopts and comprise and use global positioning system (GPS) receiver, this receiver and depend on the base station and be positioned at around position altogether, the base station of the line-of-sight transmission between the one or more satellites in the Earth's orbit.Yet owing to maybe can be positioned at underground base station to the base station that may be arranged in building or tunnel, line-of-sight transmission does not always exist, and therefore the time synchronized of base station always easily is not provided sometimes.

Yet asynchronous transmission is not the problem that does not have them.For example, supporting the autonomous environment of dispatching (all allowing to transmit as required thereby MS transmits the data and all MS that are arranged in its transmission buffer at any time) by the MS of single MS, it is quite irregular and/or at random that the sequential of ul transmissions is actually.When traffic carrying capacity was low, because the possibility of the data collision (promptly overlapping) that is being transmitted simultaneously by a plurality of MS also is low, so the problem of the autonomy of ul transmissions scheduling was less.And, in collision event, exist available standby Radio Resource that the demand of any repeating transmission is provided.Yet, along with the increase of traffic carrying capacity, the also corresponding increase of the possibility of data collision (overlapping).The demand of any repeating transmission also correspondingly increases, thereby the availability of the standby Radio Resource of the repeating transmission that support is accelerated correspondingly reduces.Therefore, the explicit scheduling of introducing by scheduling controller (when launching thereby manage MS by network) is useful.

Even yet by explicit scheduling, if the beginning of asynchronous communication and termination time are inconsistent, particularly gap and overlapping still can take place in inconsistent with respect to the beginning of the different ul transmissions sections of each asynchronous base station and the beginning of termination time and termination time.Data slit and overlapping Radio Resource (rise-over-thermal (the rise over thermal for example that all represents, ROT), this is the known measurement of reverse link traffic load in the cdma system) management be invalid, management more accurately can cause the minimizing of more effective use of usable radio resources and rise-over-thermal.

For example, Fig. 1 is the structure chart of prior art communication system 100.Communication system 100 can be cdma2000 or WCDMA system.Communication system 100 comprises a plurality of sub-districts (showing seven), and wherein each sub-district is divided into three sectors (a, b and c).The BSS 101-107 that is arranged in each sub-district provides communication service to each travelling carriage that is arranged in the sub-district, place.Each BSS 101-107 comprises a plurality of BTS, BTS and the travelling carriage wireless connections that are arranged in the sector of BSS institute Serving cell.Communication system 100 further comprises radio network controller (RNC) 110 that is coupled to each BSS and the gateway 112 that is coupled to this RNC.Gateway 112 provides interface with external network for communication system 100, such as public switch telephone network (PSTN) or internet.

Communication link quality between the BSS (for example BSS 101) of MS (for example MS114) and this MS of service changes along with moving of time and MS usually.The result, when the communication link quality between MS 114 and the BSS 101 descends, communication system 100 provides soft handover (SHO) process, can be transformed into the communication link of another better quality from first communication link that quality descends by soft handover (SHO) process MS 114.For example, as shown in Figure 1, carrying out 3 road soft handovers by the MS 114 of the BTS of the sector b that serves sub-district 1 service and the sector c of sub-district 3 and the sector a of sub-district 4.The BTS relevant with the sector of serving this MS simultaneously, promptly and sector 1-b, the BTS that 3-c is relevant with 4-a is called the Active Set of MS in this area.

With reference now to Fig. 2,, shows the soft switching process of carrying out by communication system 100.Fig. 2 is the structure chart of the hierarchy of communication system 100.As shown in Figure 2, RNC 110 comprises ARQ function 210, scheduler 212 and soft handover (SHO) function 214.Fig. 2 has further described a plurality of BTS 201-207, and wherein each BTS provides wave point at corresponding BSS 101-107 and between by the MS in the sector of this BSS service.

When carrying out soft handover, each BTS 201,203,204 in the Active Set of MS 114 receives transmission from MS 114 via the reverse link of communication channel 221,223,224 separately.This Active Set BTS 201,203 and 204 is determined by SHO function 214.If receive transmission from MS 114, the content of the radio frames that each Active Set BTS 201,203,204 demodulation and decoding are received and relevant frame quality information.

Here, so transmitting to RNC 110, each Active Set BTS 201,203,204 separated decoded radio frames of mediation and relevant frame quality information.RNC 110 receives to have separated from each BTS 201,203,204 in the Active Set and is in harmonious proportion decoded radio frames and relevant frame quality information and selects best frame based on the frame quality information.So the scheduler 212 of RNC 110 and ARQ function 210 generates control channel information, this control channel information is assigned to each BTS 201,203,204 in the Active Set as the radio frames of identical preformatting.Active Set BTS 201,203 then, and 204 broadcast the radio frames of preformatting simultaneously via forward link.So this control channel information is made to be used for determining to use which kind of transmission rate by MS 114.

Selectively, MS the BTS (BTS 201) of resident current area can comprise the scheduler of himself and when when MS provides schedule information, omitting RNC 110.Like this, scheduling feature connects receving station (BTS) to the Active Set base station and was assigned with by allowing BTS to carry out the controlled function of before having been supported by RNC by allowing travelling carriage (MS) to send control information corresponding to enhanced reverse link transmission.MS in the SHO zone can select the scheduling corresponding to best transformat and resource indicator (TFRI) from a plurality of scheduling distribute, it is that MS receives from a plurality of Active Set BTS that this scheduling distributes.As a result, can during SHO, dispatch the enhanced uplink channel, and need not any explicit communication between the BTS.In arbitrary example, the constraints of explicit transmitting power (it is a hidden data rate constraint condition) is provided by scheduler, and this scheduler makes to be used for determining to use which kind of transmission rate together with control channel information by MS 114.

Along with the UMTS system is proposed, the uplink data rate that MS can use enhanced uplink dedicated transmission channel (EUDCH) to obtain to improve.MS must be identified for the data rate of enhanced uplink and must be during soft handover carries out like this based on the local measurement value on the MS with by the information that scheduler provides, make that the increase of neighbor cell (except the Active Set sub-district) interference level is not too large, so that the up link audio frequency is reduced significantly with other signalings coverings.

There are two kinds of basic skills in transmission for DUDCH scheduling UE: the rate scheduling of (1) Node B control, wherein all ul transmissions can the while occurs at random together with being subject to the selection speed that makes the overall noise increase that is positioned at Node B be in acceptable level, (2) time and the rate scheduling of Node B control wherein only have the subclass that will send professional UE and can be selected at the given time interval and adopt and be subject to the selection speed that satisfies noise and increase needs and transmit.

In order to obtain high uplink spectrum efficient, satisfy rise-over-thermal (RoT) noise requirements of Node B simultaneously, interference is very important and is quite difficult between strict control RoT variation and sectors/cells.By scheduler is shifted to Node B from RNC, manyly can lose about the information of disturbing between sectors/cells.Owing to surpass 50% RoT from contributing between sectors/cells, so this is significant disadvantage, is the waste of RoT surplus resource.In addition, in/high speed UE, the business of burst and postpone for a long time (frame sign), the control RoT difficulty more that becomes.By using prior art, RoT changes greatly and disturbs Be Controlled well between cell/section, thereby causes low relatively sector and user throughput.Therefore, very expectation has a kind of method that is used for uplink rate control signaling, though there are some difficulties, this method can obtain the sector and the user throughput of increase by high relatively uplink spectrum efficient.

Description of drawings

Fig. 1 is the structure chart of the example communication system of prior art.

Fig. 2 is the structure chart of the hierarchy of Fig. 1 communication system.

Fig. 3 has described the distributed network structure according to a plurality of embodiment of the present invention.

Fig. 4 is the logical flow chart of the uplink rate control signaling of a plurality of embodiment according to the present invention.

Fig. 5 is the structure chart of the communication system of a plurality of embodiment according to the present invention.

Fig. 6 is example explanation of the SAM encoding channel group of a plurality of embodiment according to the present invention, and the user who has wherein dispatched is assigned to the dispatched users group or difference covers/and the SAM channel in the non-scheduling SHO user group and the SHO user of wherein non-scheduling can only be assigned with the SAM channel in the non-scheduling SHO user group.

Fig. 7 is an example explanation of the SAM encoding channel group of a plurality of embodiment according to the present invention, supposes that SHO user reselects the EU that is being dispatched by an Active Set sub-district (dispatching the same cells of HS-PDSCH) when occurring up to the Active Set sub-district.

Fig. 8 is an example explanation of the scheduling assignment messages channel of a plurality of embodiment according to the present invention.

Fig. 9 is the SAM mask (coloud coding) of a plurality of embodiment according to the present invention, an example explanation of coding and punching.

Figure 10 is the example explanation of FPCCH and the SPCCH of a plurality of embodiment according to the present invention.

Figure 11 is the form that a plurality of embodiment have shown the example characteristic of enhanced uplink channel according to the present invention.

Embodiment

Embodiment as described herein has proposed to wish to have a kind of method that is used for uplink rate control signaling, and this method can adopt high relatively uplink spectrum efficient to realize sector and the user throughput that increases.Disclosed rate control signaling embodiment adopts two public persistent values to upgrade the distribution portion of the RoT surplus of each UE equipment, thereby, reduce the variation of RoT.In addition, SHO information is used to control and disturbs between sectors/cells and the raising sector throughput.In this embodiment, each UE comes specified data speed and transmission time according to these public persistent values, SHO state and buffered data.With respect to time that needs more signaling and information significantly and rate scheduler, throughput can realize and to postponing, the speed of UE and business burst demonstrate littler sensitivity by among these embodiment some.

In specific embodiments more of the present invention, Node B sends two groups and continues information is controlled this UE to all UE equipment speed.Each UE comes specified data speed and transmission time according to one or more, its power headroom, buffer capacity and the SHO state in these persistent values.By adopting public signaling to replace dedicated signaling, need signaling significantly still less to each UE.(for example 1Hz) do not send at a slow speed persistent value and reports the average load/state of this sector not continually.This at a slow speed persistent value can be sent out by adopting auxiliary Common Control Channel (S-CCPCH).Node B is measured the average total load/state of this sector and is sent the relevant signaling of upgrading at a slow speed and controls each UE part of RoT surplus and its transmitted data rates thus.Not frequent renewal has reduced the complexity of system and has allowed by repeating to transmit information reliably with low-power such as adopting.

In addition, in some specific embodiments, (for example, 50Hz) adopt the new Common Control Channel (FPCCH) that continues fast to be reported at each TTI with proportional the continuing fast of the instantaneous RoT level of sector.This FPCCH is based on the rising/decline bit of instantaneous RoT cell measurement value carrying single (integral body).Disturb in order to control between RoT variation and sectors/cells, rising/decline continues bit and is sent to all UE equipment of serving this sub-district every (for example) 2ms.By adopting the rapid adjustment of this effective RoT surplus, obtained relatively little RoT and changed, be converted to high sector/user throughput.In addition, dispatching algorithm can utilize SHO information to reduce the effect of sector/cell interference for the RoT surplus, and this has also improved sector/user throughput conversely.

Embodiments of the invention comprise a kind of method that is used for rate control signaling in wireless communication system, thereby promote subscriber equipment (UE) uplink data transmission.This method comprises periodically to be determined rise-over-thermal (RoT) level and via first Common Control Channel indication of RoT level is sent to UE by Node B.This method also comprises periodically to be determined the average load value that amounts to and by Node B the indication of the average load value that amounts to is sent to UE via second Common Control Channel.

Embodiments of the invention comprise that another kind is used for the method for rate control signaling.This method comprises periodically by UE and receives the indication of rise-over-thermal (RoT) level and the indication that is periodically received the average load value of total by UE by second Common Control Channel of Node B via first Common Control Channel of Node B.This method also comprises by UE and adopts the average load value of RoT level and total to determine to modulate and encoding scheme (MCS) grade and come transfer uplink data with the MCS grade by UE.

These and other embodiment of the present invention will describe more specifically with reference to figure 3-11.Fig. 5 is the structure chart of the communication system 1000 of a plurality of embodiment according to the present invention.Preferably, communication system 1000 is code division multiple access (CDMA) communication system, cdma2000 or wideband CDMA (WCDMA) communication system for example, and it comprises a plurality of communication channels.Those skilled in the art understand this communication system 1000 and can operate according to any of various wireless communication system, global system for mobile communications (GSM) communication system for example, time division multiple access (TDMA) communication system, frequency division multiple access (FDMA) communication system, or OFDM (OFDM) communication system.

Be similar to communication system 100, communication system 1000 comprises a plurality of sub-districts (illustrating seven).Each sub-district be divided into a plurality of sectors (each sub-district illustrates three sector a, b, c).Base station sub-system (BSS) 1001-1007 that is arranged in each sub-district provides communication service to each travelling carriage that is arranged in this sub-district.Each BSS 1001-1007 comprises a plurality of base stations, is also referred to as to be base transceiver station (BTS) itself and the travelling carriage wireless connections that are arranged in by the sector of the sub-district of BSS service here.Communication system 1000 further comprises preferably by the radio network controller (RNC) 1010 of 3GPP TSG UTRANlub interface and each BSS coupling and the gateway 1012 that is coupled with RNC.Gateway 1012 provides interface with external network, for example public switch telephone network (PSTN) or internet for communication system 1000.

With reference now to Fig. 3 and Fig. 5,, communication system 1000 further comprises at least one travelling carriage (MS) 1014.MS1014 can be any wireless user equipment (UE), mobile phone for example, portable phone, radio telephone, or with the relevant radio modem of data terminal equipment (DTE) such as PC (PC) or kneetop computer.Should be understood that MS, UE and user hereinafter are replaced use whole.MS1014 is by a plurality of base stations or BTS service, and this BTS is included in the Active Set relevant with MS.MS1014 and each BTS in communication system 1000 carry out radio communication via wave point, and this wave point comprises forward link (from BTS to MS) and reverse link (from MS to BTS).Each forward link comprises a plurality of forward link control channel, wireless channel and Traffic Channel.Each reverse link comprises a plurality of The function of backward power control channel, wireless channel and Traffic Channels.Yet, different with communication system of the prior art 100, each reverse link of communication system 1000 further comprises another Traffic Channel, enhanced uplink dedicated transmission channel (EUDCH), delivery of energy is enough dynamically to be modulated and the data of coding and demodulation sign indicating number promote high speed data transfer by allowing to upload in sub-frame basis one by one for this.

Communication system 1000 comprises a soft handover (SHO) process, and MS1014 can be transformed into the air interface of another better quality from first air interface that quality descends by soft handover (SHO) process.For example, as shown in Figure 4, carrying out 3 road soft handovers by the MS1014 that BTS served of the sector b that serves sub-district 1 and the sector c and the sector a in the sub-district 4 of sub-district 3.The BTS relevant with the sector that is currently serviced in MS, just, with sector 1-b, the BTS that 3-c is relevant with 4-a is the Active Set of MS.In other words, MS1014 and serve the sector 1-b of MS, the BTS301 that 3-c is relevant with 4-a, 303 and 304 carry out soft handover (SHO), these BTS are Active Sets of MS.As used herein, term " Active Set " and " service ", for example Active Set BTS and serving BTS can be exchanged, and the both is meant the BTS that is in the Active Set relevant with MS.In addition, though Fig. 3 and 4 has described BTS301,303 and 304 only serve single MS, and those skilled in the art will be appreciated that each BTS301-307 can dispatch and serve a plurality of MS simultaneously, just, each BTS 301-307 can be the member of a plurality of Active Sets simultaneously.

Fig. 3 shows the network configuration 300 of the communication system 1000 of a plurality of embodiment according to the present invention.As shown in Figure 3, communication system 1000 comprises a plurality of BTS 301-307, and wherein each BTS provides the wave point between corresponding BSS 1001-1007 and the MS in the sector of this BTS service.Preferably, scheduling feature 316, ARQ function 314 and SHO function 318 are distributed among each BTS 301-307.RNC1010 is responsible for carrying out mobile management and being used to adjust multicast/multiple spot reception group by the member of definition by the Active Set of each MS (for example MS1014) of communication system 1000 services.For each MS in the communication system 1000, Internet Protocol (IP) grouping is multi-cast directly to each BTS in the MS Active Set, just is sent to the BTS 301,303,304 in the Active Set of MS1014.

Preferably, each the BTS 301-307 in the communication system 1000 comprises the SHO function 318 that is used to carry out at least a portion SHO function.For example, the SHO function 318 of each BTS 301,303,304 in the Active Set of MS1014 is carried out the SHO function of selecting and announce new data indicator such as frame.Each BTS 301-307 comprises scheduler or the scheduling feature 316 that resides on alternatively among the RNC110.Dispatch by BTS, (for example BTS 301 about each Active Set BTS of MS1014,303 and 304) can selectively dispatch relevant MS1014 with this locality that measures at BTS interference with SNR information based on the schedule information that sends to BTS by MS, and not need to communicate with other Active Set BTS.By being BTS 301-307 allocation schedule function 306, Active Set need not to switch EUDCH in communication system 1000.Reside on equally that ARQ function 314 and AMC function can also be assigned among the BTS 301-307 of communication system 1000 among the RNC110 of communication system 100.As a result, when the data block in specific hybrid ARQ channel is activated collection BTS when successfully decoding, BTS (for example, MS1014) confirms that this successfully decodes and need not wait for being indicated by RNC1010 and send ACK by sending ACK to source MS.

In order to allow each Active Set BTS 301,303,304 each EUDCH frame of decoding, MS 1014 sends modulation and the coded message relevant with the EUDCH frame from MS1014, incremental redundancy type information, HARQ state information and transport block size information are to each Active Set BTS, and this information is called as transformat and related resource information (TFRI) jointly.TFRI only refers to that speed conciliates tone coded information and H-ARQ state.1014 couples of TFRI of MS encode and send TFRI by the frame period identical with EUDCH (frame boundaries of considering TFRI and EUDCH can the staggered fact).By the MS1014 signaling of the TFRI relevant with each enhanced reverse link transmission is provided to Active Set BTS 301,303,304, communication system 1000 can be with distributed support HARQ, AMC, and Active Set switches and scheduling feature.

For some additional contexts are provided, Fig. 6-9 provides the exemplary illustrated to scheduling assignment messages (SAM) and SAM encoding channel.SAM can be used to dispatch the zero-time of E-DPDCH (or DPDCH) transmission of single UE and the maximum power surplus (or maximum TFC) that indication allowed.Unique UE ID is used to each SAM channel is carried out the SAM channel that coloud coding is distributed to allow the user to detect self.

In certain embodiments, convolutional encoding, coloud coding and spreading factor (SF) they are the SAM channel that 128 or 256 OVSF coding is used to have 1 and 3 time slot TTI.This allows significantly safe and reliable low-power operation and effective code word space utilance.The zero-time of SAM channel is the time of aiming at the zero-time of HS-SCCH.User for scheduling advises adopting the convolutional encoding of speed=1/2 that 8 information bits and 12 CRC bits are mapped to 40 binary characters, then be coloud coding (adopt and the HS-SCCH that is applied to produce from 16 bit HS-DSCH wireless network identifier (H-RNTI) the identical special-purpose mask of 40 bit users of part 1), adopt the OVSF of SF=128 to be coded on the single time slot then and expand.SHO user for there not being scheduling advise 8 information bits, 6 trail with 16 CRC bits by a R=1/3 convolutional encoding and rate-matched to 60 binary character, utilize with our CRC of 16 bit H-RNTI (coloud coding) screen and modulate mapping.Adopt the OVSF of SF=256 to be coded in escape character on the 2ms TTI of three time slots then.

According to more than, thereby can calculate processing gain:

1 time slot: PG=10*log10 (2560/8)=25.1dB

3 time slots: PG=10*log10 ((3*2560)/8)=29.2dB

Suppose EB/Nt=4.0dB for awgn channel 0.1%BER, so:

Ec/lor_1slot=-21.1dB is for 0dB Geometry (=4.0-25.1-(+0))

Ec/lor_3slot=-20.8dB is for-5dB Geometry (=4.0-29.8-(5))

In an embodiment of the present invention, two additional downlink control channels have also been adopted.As shown in figure 10 and more specifically in Figure 11, continue Common Control Channel (FPCCH) fast and carried the rising/decline bit of single (integral body) based on instantaneous RoT cell measurement value.Change in order to control RoT, this rising/decline continues bit and is sent to all UE that served by this sub-district every 2ms.(should be understood that all UE adopt identical rising/decline bit).Continue Common Control Channel (SPCCH) at a slow speed and adopt the average load state (8 bit) of Serving cell that all UE are upgraded once (1Hz renewal rate) each second, control its transmitted data rates thereby make each UE adjust its RoT surplus of distributing.

At FPCCH, single rising/decline bit is repeated 60 times, then is modulation mapping, adopts the OVSF of spreading factor (SF) 256 to be coded on the 2ms TTI of 3 time slots then and expands.Therefore calculate processing gain:

PG＝10*log10(3*2560)＝38.9dB

Suppose BPSK 1%BER Eb/Nt=4.5dB for awgn channel, so:

Ec/lor FPCCH=-29.4dB is for-5dB Geometry (=4.5-38.9-(5))

At SPCCH, 8 bit cell load designators, 16 bit CRC and 8 bits are trailed by a R=1/3 convolutional encoding and rate-matched to 300 binary character, and QPSK modulates mapping, adopt the OVSF of SF=256 to be coded on the 10ms TTI of 15 time slots then and expand.Should be understood that SPCCH time division multiplexing and be not subjected to systematic influence on the lasting encoding channel identical, because the SPCCH transmission only was sent out once in one second with the FPCCH channel.

According to more than, therefore can calculate processing gain:

PG＝10*log10(38400/8)＝36.8dB

Suppose Eb/Nt=4.0dB for awgn channel 0.1%BER, so:

Ec/lor SPCCH=-27.8dB is for-5dB Geometry (=4.0-36.8-(5))

Fig. 4 is the logical flow chart of the uplink rate control signaling of a plurality of embodiment according to the present invention.The exemplary rate control algorithm of block diagram 400 expressions, various optional embodiments according to the present invention all are included in wherein.Logic flow originates in initialization (402).Supposing has K movable UE equipment in the sector, Node B and UE device initialize are as follows:

D＝0，Δ＝0.5， $H_{\mathrm{total}}=\frac{1}{\mathrm{\Δ}}\underset{\mathrm{active}}{\mathrm{\Σ}}\frac{H_k}{L_{\mathrm{SHO}}}$

Wherein, if UE is not among the SHO, L so _SHO Equal 1, if in 2 road SHO then equal 2, if in 3 road SHO then equal 3, or the like, and H _k=F (h _k, L _{Buf, k}, w _k) be channel quality h _k(up link or down link), buffer capacity L _{Buf, k}, from the function of weighted factor of business model priority or QoS etc.Suppose that information all is available in Node B and UE equipment, and parameter K and H _kAll adopt in a like fashion at Node B and UE k and to be updated.Channel quality in this up link can be estimated to draw from pilot tone or power control information, and the channel quality of down link obtains from the HSDPA CQI feedback of UE.Should be understood that in them and only need one.

Node B goes up in the TTI time (for example, 2 or 10ms) and measures (404) instantaneous RoT that receives, and calculates D according to following equation then:

Here, U and L are some predetermined threshold value.Node B adopts Common Control Channel every TTI, for example FPCCH or on common ACK/NACK channel time division multiplexing send and to continue parameter D fast.

Each UE equipment receives (406) to be continued parameter D fast and upgrades Δ (n) according to following formula:

$\mathrm{\Δ}\left(n\right)=\max \left\{\min \right\{\mathrm{\Δ}(n-1)\×{10}^{\frac{D\left(n\right)\mathrm{\δ}}{10}},{\mathrm{\Δ}}_{\max }\},{\mathrm{\Δ}}_{\min }\}$

Wherein δ is little step-length, for example is 0.01dB.

Node B and UE k are also according to H _k(n)=2H _k(n-1)+(1-λ) F (h _k, L _{Buf, k}, w _k) be updated periodically H _kThen in the Node B basis $H_{\mathrm{total}}=\frac{1}{\mathrm{\Δ}\left(n\right)}\underset{\mathrm{active}}{\mathrm{\Σ}}\frac{H_k}{L_{\mathrm{SHO}}}$ Determine that (408) continue Parameter H at a slow speed _Total, and H _TotalIndication adopt Common Control Channel to be sent out (for example, per second once), for example auxiliary Common Control Channel (S-CCPCH).Each UE equipment receives (410) H _TotalParameter, it upgrades its copy and the Δ that resets (n)=1.Should be understood that generally that in SHO UE equipment obtains the information that continues and based on its scaled maximum rate of SHO state from the strongest down link Active Set sub-district.

In order to prevent that UE from sending parameters R under the situation of bad channel _Margin ^k(n) provided the upper bound of the RoT that UE can use.Thereby when bad channel, UE will no longer launch with maximum power, and this causes a lot of interference but to obtain seldom user/sector throughput to network.And, when channel quality is abominable, R _Mim ^k(n) provide the lower bound of the RoT that the UE corresponding to minimum data rate should use.Each movable UE determines (412) its RoT surplus part according to following formula:

$R_{m\arg \mathrm{in}}^k\left(n\right)=\frac{\mathrm{RoT}\×H_k}{H_{\mathrm{total}}{L}_{\mathrm{SHO},k}}\×\mathrm{\Δ}\left(n\right)$

UE adopts its RoT surplus then, the MCS that the data in its instantaneous uplink channel quality (or the TFCS state machine in Rel-99) and its buffer are identified for sending, and it comprises data rate, code rate, modulation and power.

The more detailed example how the MCS grade is used for enhanced uplink will be determined hereinafter.In order to reduce the expense of control channel signaling, include the transmission block size, modulation, the TFRI channel of coding and new data indicator is limited to 8 bits.In 8 bits, 5 bits are used to transmit the transmission block size, and modulation and code rate are (referring to enhanced uplink TR25.986 V2.0.0, R1-040392).By impliedly calculating redundancy versions (RV) (referring to R1-04207 from Connection Frame Number (CFN) derived parameter, " Feasibility of IRschemes for EUL during SHO " Siemens) and because of this do not need unnecessary bit notice RV parameter.When deriving when need be used for the amount of bits of TFRI channel, suppose the N channel fully synchronous stopping to wait for agreement.Table 1 has been advised 31 MCS tier group, and it can adopt 5 bits to notify.The space that in this table, can add MCS grade additional more than 5 in addition.

Table 1 MCS grade

Data rate (Kbps)	2ms Tr Blk (bit)	SF	Mod	Symbol among the 2ms	Data rate 1 stTx	Code rate 1 stTx	Data rate 2 ndTx	Code rate 2 ndTx	Data rate 3 rdTx	Code rate 3 rdTx
											8	16	256	BPSK	30	8	0.53	4	0.33	2.67	0.33
16	32	128	BPSK	60	16	0.53	8	0.33	5.33	0.33
											32	64	64	BPSK	120	32	0.53	16	0.33	10.7	0.33
40	80	32	BPSK	240	40	0.33	20	0.33	13.3	0.33
											64	128	32	BPSK	240	64	0.53	32	0.33	21.3	0.33
80	160	16	BPSK	480	80	0.33	40	0.33	26.7	0.33
											96	192	16	BPSK	480	96	0.40	48	0.33	32	0.33
128	256	16	BPSK	480	128	0.53	64	0.33	42.7	0.33
											160	320	8	BPSK	960	160	0.33	80	0.33	53.3	0.33
192	384	8	BPSK	960	192	0.40	96	0.33	64	0.33
											256	512	8	BPSK	960	256	0.53	128	0.33	85.3	0.33
320	640	4	BPSK	1920	320	0.33	160	0.33	107	0.33
											384	768	4	BPSK	1920	384	0.40	192	0.33	128	0.33
640	1280	4	QPSK	1920	640	0.33	320	0.33	213	0.33
											768	1536	4	QPSK	1920	768	0.40	384	0.33	256	0.33
960	1920	4	QPSK	1920	960	0.50	480	0.33	320	0.33
											1152	2304	4	QPSK	1920	1152	0.60	576	0.33	384	0.33
1280	2560	2	QPSK	3840	1280	0.333	640	0.33	427	0.33
											1440	2880	2	QPSK	3840	1440	0.375	720	0.33	480	0.33
1728	3456	2	QPSK	3840	1728	0.450	864	0.33	576	0.33
											1920	3840	2	QPSK	3840	1920	0.500	960	0.33	640	0.33
2160	4320	2	QPSK	3840	2160	0.563	1080	0.33	720	0.33
											2160	4320	2，4	QPSK	5760	2160	0.375	1080	0.33	720	0.33
2496	4992	2，4	QPSK	5760	2496	0.433	1248	0.33	832	0.33
											2880	5760	2，4	QPSK	5760	2880	0.500	1440	0.33	960	0.33
3200	6400	2，4	QPSK	5760	3200	0.556	1600	0.33	1067	0.33
											3649	7298	2，4	QPSK	5760	3649	0.634	1824.5	0.33	1216	0.33
4096	8192	2，4	QPSK	5760	4096	0.711	2048	0.356	1365	0.33
											4322	8644	2，4	QPSK	5760	4322	0.750	2161	0.375	1441	0.33
5124	10248	2，4	QPSK	5760	5124	0.890	2562	0.445	1708	0.33
											5760	11520	2，4	QPSK	5760	5760	1.000	2880	0.500	1920	0.33
TBD

For reliable and simplify signaling, the N channel fully synchronously or partial asynchronous stop to wait for that agreement is supposed to be used for enhanced uplink.Be similar to HS-DSCH, two-stage rate-matched scheme can be used to enhanced uplink.RV parameter (s and r) is fixed for each transmission and can be defined for the N channel that is shown in Table 2 stopping to wait for agreement, the example of new data indicator state and SFN/CFN.From table 1, can obtain in most of the cases systematic bits revolution in transmission for the third time.

Table 3 shows and is used for each s that transmits and the example of r.

In order to support the steadily increase redundancy among the SHO, (referring to R1-04207, " Feasibility of IR schemes for EUL during SHO " Siemens) significantly improves the reliability of new data indicator to need to adopt such scheme.As an alternative, in SHO, only can support Chasing to merge so that the RV parameter does not rely on the new data indicator bit.Another selection that is used for IR transmission is only to limit s and r parameter to CFN, shown in last row of table 3.Obtain high reliability although should note working as in this case, transmission in some cases can be by self-demarking code for the first time.

Table 2. CFN, HARQ channel #, the relation between new data indicator and the RV (N=6)

CFN	HARQ channel #	New data indicator	IR:s and r	Chase:s and r	IR:s and r are defined as CFN
						0	0	0	(1， 0)	(1， 0)	(1， 0)
1	1	0	(1， 0)	(1， 0)	(1， 0)
						2	2	0	(1， 0)	(1， 0)	(1， 0)
3	3	0	(1， 0)	(1， 0)	(1， 0)
						4	4	0	(1， 0)	(1， 0)	(1， 0)
5	5	0	(1， 0)	(1， 0)	(1， 0)
						6	0	1	(1， 0)	(1， 0)	(0， 1)
7	1	0	(0， 1)	(1， 0)	(0， 1)
						8	2	0	(0， 1)	(1， 0)	(0， 1)
9	3	0	(0， 1)	(1， 0)	(0， 1)
						10	4	1	(1， 0)	(1， 0)	(0， 1)
11	5	1	(1， 0)	(1， 0)	(0， 1)
						12	0	2	(1， 0)	(1， 0)	(0， 2)
13	1	0	(0， 2)	(1， 0)	(0， 2)
						14	2	1	(1， 0)	(1， 0)	(0， 2)
15	3	0	(0， 2)	(1， 0)	(0， 2)
						16	4	1	(1， 0)	(1， 0)	(0， 2)
17	5	1	(0， 1)	(1， 0)	(0， 2)

(note: some channel examples can be crossed when table according to N revolution takes place)

The RV parameter of table 3. in each Tx

1 ST Transmission		2 nd Transmission		3 rdTransmission
						s	R	s	r	s	r
1	0	0	1	0	2

In detailed description above, the present invention describes with reference to specific embodiment.Yet those skilled in the art is to be understood that under the situation that does not break away from the spirit and scope of the present invention of illustrating in the claims can make various modifications and change.Therefore, specification and accompanying drawing will be counted as exemplary rather than determinate, and all these changes all are intended to comprise within the scope of the invention.In addition, it will be understood by those skilled in the art that the element of describing among the figure need not to draw according to ratio for simple and purpose clearly.For example, some unary sizes can be exaggerated the understanding that helps to improve to various embodiments of the invention with respect to other element in the drawings.

Benefit, other advantage and way to solve the problem are described in about specific embodiments of the invention above-mentioned.Yet, benefit, advantage, way to solve the problem and cause or cause these benefits, advantage, or solution or make these benefits, advantage, or solution becomes clearer and more definite arbitrary key element (a plurality of) and is not interpreted as arbitrarily or all authority requirement determine essential or necessary feature or element.Be similar to employed here, in accessory claim, term " comprises ", " comprise " or wherein any other changes and all to be intended to indicate not exclusive comprising, make the process that comprises a row key element, method, product or equipment not only comprise those elements in the row, also comprise and do not have clear and definite be listed in or, method, other key element that product or equipment are intrinsic in these processes.

Term used herein " one " is defined as one or more.Term used herein " a plurality of " is defined as two or more.Term used herein " another " be defined as at least another or more a plurality of.Term used herein " comprises " and/or " having " is defined as comprising (that is open language).Term used herein " coupling " is defined as connecting, although need not to be directly with mechanical.

Claims (17)

1. method that is used for rate control signaling, to promote subscriber equipment (UE) uplink data transmission, this method comprises:

Periodically determine rise-over-thermal (RoT) level;

Periodically send the indication of RoT level to UE by first Common Control Channel by Node B;

Periodically determine to amount to the average load value;

Periodically send the indication that amounts to the average load value by Node B by second Common Control Channel to UE.

2. according to the described method of claim 1, wherein the RoT level comprises instantaneous RoT level.

3. according to the described method of claim 1, the indication that wherein periodically sends the RoT level is included in the indication that each Transmission Time Interval (TTI) sends the RoT level.

4. according to the described method of claim 1, wherein first Common Control Channel comprises fast lasting Common Control Channel (FPCCH).

5. according to the described method of claim 1, wherein second Common Control Channel comprises auxiliary Common Control Channel (S-CCPCH).

6. according to the described method of claim 1, wherein the indication of RoT level comprises that the RoT level is higher than high threshold and still is lower than lowest threshold, the indication that perhaps neither is.

7. according to the described method of claim 1, wherein amount to the average load value and comprise that low speed continues parameter.

8. according to the described method of claim 1, wherein periodically determine to amount to the average load value and comprise the indication that receives average channel quality by Node B from a plurality of UE equipment by uplink control channel.

9. according to the described method of claim 1, determine periodically that wherein amounting to the average load value comprises that utilization is by uplink channel quality, downlink channel quality, buffer capacity, at least a type of measuring in the group that business model priority and QoS form determines to amount to the average load value.

10. method that is used for rate control signaling, to promote subscriber equipment (UE) uplink data transmission, this method comprises:

Periodically receive first load designator by first Common Control Channel of UE by Node B;

Periodically receive the indication of total average load value by second Common Control Channel of Node B by UE;

Adopt RoT level and total average load value to determine modulation and encoding scheme (MCS) grade by UE;

Send uplink data by UE with described MCS grade.

11., determine that wherein the MCS grade comprises the RoT surplus of employing by UE, at least some information in the group that the uplink quality of UE and the buffered data of UE are formed according to the described method of claim 10.

12. according to the described method of claim 10, wherein the MCS grade comprises by data rate, code rate, at least one transmission parameter in the group that modulation and power level are formed.

13., further comprise the RoT surplus of determining UE according to the described method of claim 10.

14. according to the described method of claim 13, wherein the RoT surplus of UE comprises that UE can be used in the upper bound of the RoT of transmission.

15., determine that wherein the RoT surplus of UE comprises that employing is by amounting to the average load value, first load designator, the soft handover that UE participates in, at least some information in the group that the average load value of UE is formed according to the described method of claim 13.

16., further comprise the indication that sends UE average load value by UE according to the described method of claim 10.

17. described method according to claim 16, the average load value that wherein sends UE comprises that utilization is by uplink channel quality, downlink channel quality, buffer capacity, at least a in the group that business model priority and QoS form measured the average load value that type is determined UE.

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